1414c70cbSLiam Girdwood /* 2414c70cbSLiam Girdwood * core.c -- Voltage/Current Regulator framework. 3414c70cbSLiam Girdwood * 4414c70cbSLiam Girdwood * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5a5766f11SLiam Girdwood * Copyright 2008 SlimLogic Ltd. 6414c70cbSLiam Girdwood * 7a5766f11SLiam Girdwood * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8414c70cbSLiam Girdwood * 9414c70cbSLiam Girdwood * This program is free software; you can redistribute it and/or modify it 10414c70cbSLiam Girdwood * under the terms of the GNU General Public License as published by the 11414c70cbSLiam Girdwood * Free Software Foundation; either version 2 of the License, or (at your 12414c70cbSLiam Girdwood * option) any later version. 13414c70cbSLiam Girdwood * 14414c70cbSLiam Girdwood */ 15414c70cbSLiam Girdwood 16414c70cbSLiam Girdwood #include <linux/kernel.h> 17414c70cbSLiam Girdwood #include <linux/init.h> 181130e5b3SMark Brown #include <linux/debugfs.h> 19414c70cbSLiam Girdwood #include <linux/device.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 21f21e0e81SMark Brown #include <linux/async.h> 22414c70cbSLiam Girdwood #include <linux/err.h> 23414c70cbSLiam Girdwood #include <linux/mutex.h> 24414c70cbSLiam Girdwood #include <linux/suspend.h> 2531aae2beSMark Brown #include <linux/delay.h> 2669511a45SRajendra Nayak #include <linux/of.h> 2769511a45SRajendra Nayak #include <linux/regulator/of_regulator.h> 28414c70cbSLiam Girdwood #include <linux/regulator/consumer.h> 29414c70cbSLiam Girdwood #include <linux/regulator/driver.h> 30414c70cbSLiam Girdwood #include <linux/regulator/machine.h> 3165602c32SPaul Gortmaker #include <linux/module.h> 32414c70cbSLiam Girdwood 3302fa3ec0SMark Brown #define CREATE_TRACE_POINTS 3402fa3ec0SMark Brown #include <trace/events/regulator.h> 3502fa3ec0SMark Brown 3634abbd68SMark Brown #include "dummy.h" 3734abbd68SMark Brown 387d51a0dbSMark Brown #define rdev_crit(rdev, fmt, ...) \ 397d51a0dbSMark Brown pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 405da84fd9SJoe Perches #define rdev_err(rdev, fmt, ...) \ 415da84fd9SJoe Perches pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 425da84fd9SJoe Perches #define rdev_warn(rdev, fmt, ...) \ 435da84fd9SJoe Perches pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 445da84fd9SJoe Perches #define rdev_info(rdev, fmt, ...) \ 455da84fd9SJoe Perches pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 465da84fd9SJoe Perches #define rdev_dbg(rdev, fmt, ...) \ 475da84fd9SJoe Perches pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 485da84fd9SJoe Perches 49414c70cbSLiam Girdwood static DEFINE_MUTEX(regulator_list_mutex); 50414c70cbSLiam Girdwood static LIST_HEAD(regulator_list); 51414c70cbSLiam Girdwood static LIST_HEAD(regulator_map_list); 5221cf891aSMark Brown static bool has_full_constraints; 53688fe99aSMark Brown static bool board_wants_dummy_regulator; 54414c70cbSLiam Girdwood 551130e5b3SMark Brown static struct dentry *debugfs_root; 561130e5b3SMark Brown 578dc5390dSMark Brown /* 58414c70cbSLiam Girdwood * struct regulator_map 59414c70cbSLiam Girdwood * 60414c70cbSLiam Girdwood * Used to provide symbolic supply names to devices. 61414c70cbSLiam Girdwood */ 62414c70cbSLiam Girdwood struct regulator_map { 63414c70cbSLiam Girdwood struct list_head list; 6440f9244fSMark Brown const char *dev_name; /* The dev_name() for the consumer */ 65414c70cbSLiam Girdwood const char *supply; 66a5766f11SLiam Girdwood struct regulator_dev *regulator; 67414c70cbSLiam Girdwood }; 68414c70cbSLiam Girdwood 69414c70cbSLiam Girdwood /* 70414c70cbSLiam Girdwood * struct regulator 71414c70cbSLiam Girdwood * 72414c70cbSLiam Girdwood * One for each consumer device. 73414c70cbSLiam Girdwood */ 74414c70cbSLiam Girdwood struct regulator { 75414c70cbSLiam Girdwood struct device *dev; 76414c70cbSLiam Girdwood struct list_head list; 77414c70cbSLiam Girdwood int uA_load; 78414c70cbSLiam Girdwood int min_uV; 79414c70cbSLiam Girdwood int max_uV; 80414c70cbSLiam Girdwood char *supply_name; 81414c70cbSLiam Girdwood struct device_attribute dev_attr; 82414c70cbSLiam Girdwood struct regulator_dev *rdev; 835de70519SMark Brown struct dentry *debugfs; 84414c70cbSLiam Girdwood }; 85414c70cbSLiam Girdwood 86414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev); 873801b86aSMark Brown static int _regulator_disable(struct regulator_dev *rdev); 88414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev); 89414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev); 90414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 91414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 92414c70cbSLiam Girdwood unsigned long event, void *data); 9375790251SMark Brown static int _regulator_do_set_voltage(struct regulator_dev *rdev, 9475790251SMark Brown int min_uV, int max_uV); 953801b86aSMark Brown static struct regulator *create_regulator(struct regulator_dev *rdev, 963801b86aSMark Brown struct device *dev, 973801b86aSMark Brown const char *supply_name); 98414c70cbSLiam Girdwood 991083c393SMark Brown static const char *rdev_get_name(struct regulator_dev *rdev) 1001083c393SMark Brown { 1011083c393SMark Brown if (rdev->constraints && rdev->constraints->name) 1021083c393SMark Brown return rdev->constraints->name; 1031083c393SMark Brown else if (rdev->desc->name) 1041083c393SMark Brown return rdev->desc->name; 1051083c393SMark Brown else 1061083c393SMark Brown return ""; 1071083c393SMark Brown } 1081083c393SMark Brown 109414c70cbSLiam Girdwood /* gets the regulator for a given consumer device */ 110414c70cbSLiam Girdwood static struct regulator *get_device_regulator(struct device *dev) 111414c70cbSLiam Girdwood { 112414c70cbSLiam Girdwood struct regulator *regulator = NULL; 113414c70cbSLiam Girdwood struct regulator_dev *rdev; 114414c70cbSLiam Girdwood 115414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 116414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 117414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 118414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) { 119414c70cbSLiam Girdwood if (regulator->dev == dev) { 120414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 121414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 122414c70cbSLiam Girdwood return regulator; 123414c70cbSLiam Girdwood } 124414c70cbSLiam Girdwood } 125414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 126414c70cbSLiam Girdwood } 127414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 128414c70cbSLiam Girdwood return NULL; 129414c70cbSLiam Girdwood } 130414c70cbSLiam Girdwood 13169511a45SRajendra Nayak /** 13269511a45SRajendra Nayak * of_get_regulator - get a regulator device node based on supply name 13369511a45SRajendra Nayak * @dev: Device pointer for the consumer (of regulator) device 13469511a45SRajendra Nayak * @supply: regulator supply name 13569511a45SRajendra Nayak * 13669511a45SRajendra Nayak * Extract the regulator device node corresponding to the supply name. 13769511a45SRajendra Nayak * retruns the device node corresponding to the regulator if found, else 13869511a45SRajendra Nayak * returns NULL. 13969511a45SRajendra Nayak */ 14069511a45SRajendra Nayak static struct device_node *of_get_regulator(struct device *dev, const char *supply) 14169511a45SRajendra Nayak { 14269511a45SRajendra Nayak struct device_node *regnode = NULL; 14369511a45SRajendra Nayak char prop_name[32]; /* 32 is max size of property name */ 14469511a45SRajendra Nayak 14569511a45SRajendra Nayak dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 14669511a45SRajendra Nayak 14769511a45SRajendra Nayak snprintf(prop_name, 32, "%s-supply", supply); 14869511a45SRajendra Nayak regnode = of_parse_phandle(dev->of_node, prop_name, 0); 14969511a45SRajendra Nayak 15069511a45SRajendra Nayak if (!regnode) { 15116fbcc3bSRajendra Nayak dev_dbg(dev, "Looking up %s property in node %s failed", 15269511a45SRajendra Nayak prop_name, dev->of_node->full_name); 15369511a45SRajendra Nayak return NULL; 15469511a45SRajendra Nayak } 15569511a45SRajendra Nayak return regnode; 15669511a45SRajendra Nayak } 15769511a45SRajendra Nayak 158414c70cbSLiam Girdwood /* Platform voltage constraint check */ 159414c70cbSLiam Girdwood static int regulator_check_voltage(struct regulator_dev *rdev, 160414c70cbSLiam Girdwood int *min_uV, int *max_uV) 161414c70cbSLiam Girdwood { 162414c70cbSLiam Girdwood BUG_ON(*min_uV > *max_uV); 163414c70cbSLiam Girdwood 164414c70cbSLiam Girdwood if (!rdev->constraints) { 1655da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 166414c70cbSLiam Girdwood return -ENODEV; 167414c70cbSLiam Girdwood } 168414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 1695da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 170414c70cbSLiam Girdwood return -EPERM; 171414c70cbSLiam Girdwood } 172414c70cbSLiam Girdwood 173414c70cbSLiam Girdwood if (*max_uV > rdev->constraints->max_uV) 174414c70cbSLiam Girdwood *max_uV = rdev->constraints->max_uV; 175414c70cbSLiam Girdwood if (*min_uV < rdev->constraints->min_uV) 176414c70cbSLiam Girdwood *min_uV = rdev->constraints->min_uV; 177414c70cbSLiam Girdwood 17889f425edSMark Brown if (*min_uV > *max_uV) { 17989f425edSMark Brown rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 18054abd335SMark Brown *min_uV, *max_uV); 181414c70cbSLiam Girdwood return -EINVAL; 18289f425edSMark Brown } 183414c70cbSLiam Girdwood 184414c70cbSLiam Girdwood return 0; 185414c70cbSLiam Girdwood } 186414c70cbSLiam Girdwood 18705fda3b1SThomas Petazzoni /* Make sure we select a voltage that suits the needs of all 18805fda3b1SThomas Petazzoni * regulator consumers 18905fda3b1SThomas Petazzoni */ 19005fda3b1SThomas Petazzoni static int regulator_check_consumers(struct regulator_dev *rdev, 19105fda3b1SThomas Petazzoni int *min_uV, int *max_uV) 19205fda3b1SThomas Petazzoni { 19305fda3b1SThomas Petazzoni struct regulator *regulator; 19405fda3b1SThomas Petazzoni 19505fda3b1SThomas Petazzoni list_for_each_entry(regulator, &rdev->consumer_list, list) { 1964aa922c0SMark Brown /* 1974aa922c0SMark Brown * Assume consumers that didn't say anything are OK 1984aa922c0SMark Brown * with anything in the constraint range. 1994aa922c0SMark Brown */ 2004aa922c0SMark Brown if (!regulator->min_uV && !regulator->max_uV) 2014aa922c0SMark Brown continue; 2024aa922c0SMark Brown 20305fda3b1SThomas Petazzoni if (*max_uV > regulator->max_uV) 20405fda3b1SThomas Petazzoni *max_uV = regulator->max_uV; 20505fda3b1SThomas Petazzoni if (*min_uV < regulator->min_uV) 20605fda3b1SThomas Petazzoni *min_uV = regulator->min_uV; 20705fda3b1SThomas Petazzoni } 20805fda3b1SThomas Petazzoni 20905fda3b1SThomas Petazzoni if (*min_uV > *max_uV) 21005fda3b1SThomas Petazzoni return -EINVAL; 21105fda3b1SThomas Petazzoni 21205fda3b1SThomas Petazzoni return 0; 21305fda3b1SThomas Petazzoni } 21405fda3b1SThomas Petazzoni 215414c70cbSLiam Girdwood /* current constraint check */ 216414c70cbSLiam Girdwood static int regulator_check_current_limit(struct regulator_dev *rdev, 217414c70cbSLiam Girdwood int *min_uA, int *max_uA) 218414c70cbSLiam Girdwood { 219414c70cbSLiam Girdwood BUG_ON(*min_uA > *max_uA); 220414c70cbSLiam Girdwood 221414c70cbSLiam Girdwood if (!rdev->constraints) { 2225da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 223414c70cbSLiam Girdwood return -ENODEV; 224414c70cbSLiam Girdwood } 225414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 2265da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 227414c70cbSLiam Girdwood return -EPERM; 228414c70cbSLiam Girdwood } 229414c70cbSLiam Girdwood 230414c70cbSLiam Girdwood if (*max_uA > rdev->constraints->max_uA) 231414c70cbSLiam Girdwood *max_uA = rdev->constraints->max_uA; 232414c70cbSLiam Girdwood if (*min_uA < rdev->constraints->min_uA) 233414c70cbSLiam Girdwood *min_uA = rdev->constraints->min_uA; 234414c70cbSLiam Girdwood 23589f425edSMark Brown if (*min_uA > *max_uA) { 23689f425edSMark Brown rdev_err(rdev, "unsupportable current range: %d-%duA\n", 23754abd335SMark Brown *min_uA, *max_uA); 238414c70cbSLiam Girdwood return -EINVAL; 23989f425edSMark Brown } 240414c70cbSLiam Girdwood 241414c70cbSLiam Girdwood return 0; 242414c70cbSLiam Girdwood } 243414c70cbSLiam Girdwood 244414c70cbSLiam Girdwood /* operating mode constraint check */ 2452c608234SMark Brown static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 246414c70cbSLiam Girdwood { 2472c608234SMark Brown switch (*mode) { 248e573520bSDavid Brownell case REGULATOR_MODE_FAST: 249e573520bSDavid Brownell case REGULATOR_MODE_NORMAL: 250e573520bSDavid Brownell case REGULATOR_MODE_IDLE: 251e573520bSDavid Brownell case REGULATOR_MODE_STANDBY: 252e573520bSDavid Brownell break; 253e573520bSDavid Brownell default: 25489f425edSMark Brown rdev_err(rdev, "invalid mode %x specified\n", *mode); 255e573520bSDavid Brownell return -EINVAL; 256e573520bSDavid Brownell } 257e573520bSDavid Brownell 258414c70cbSLiam Girdwood if (!rdev->constraints) { 2595da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 260414c70cbSLiam Girdwood return -ENODEV; 261414c70cbSLiam Girdwood } 262414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 2635da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 264414c70cbSLiam Girdwood return -EPERM; 265414c70cbSLiam Girdwood } 2662c608234SMark Brown 2672c608234SMark Brown /* The modes are bitmasks, the most power hungry modes having 2682c608234SMark Brown * the lowest values. If the requested mode isn't supported 2692c608234SMark Brown * try higher modes. */ 2702c608234SMark Brown while (*mode) { 2712c608234SMark Brown if (rdev->constraints->valid_modes_mask & *mode) 272414c70cbSLiam Girdwood return 0; 2732c608234SMark Brown *mode /= 2; 2742c608234SMark Brown } 2752c608234SMark Brown 2762c608234SMark Brown return -EINVAL; 277414c70cbSLiam Girdwood } 278414c70cbSLiam Girdwood 279414c70cbSLiam Girdwood /* dynamic regulator mode switching constraint check */ 280414c70cbSLiam Girdwood static int regulator_check_drms(struct regulator_dev *rdev) 281414c70cbSLiam Girdwood { 282414c70cbSLiam Girdwood if (!rdev->constraints) { 2835da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 284414c70cbSLiam Girdwood return -ENODEV; 285414c70cbSLiam Girdwood } 286414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 2875da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 288414c70cbSLiam Girdwood return -EPERM; 289414c70cbSLiam Girdwood } 290414c70cbSLiam Girdwood return 0; 291414c70cbSLiam Girdwood } 292414c70cbSLiam Girdwood 293414c70cbSLiam Girdwood static ssize_t device_requested_uA_show(struct device *dev, 294414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 295414c70cbSLiam Girdwood { 296414c70cbSLiam Girdwood struct regulator *regulator; 297414c70cbSLiam Girdwood 298414c70cbSLiam Girdwood regulator = get_device_regulator(dev); 299414c70cbSLiam Girdwood if (regulator == NULL) 300414c70cbSLiam Girdwood return 0; 301414c70cbSLiam Girdwood 302414c70cbSLiam Girdwood return sprintf(buf, "%d\n", regulator->uA_load); 303414c70cbSLiam Girdwood } 304414c70cbSLiam Girdwood 305414c70cbSLiam Girdwood static ssize_t regulator_uV_show(struct device *dev, 306414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 307414c70cbSLiam Girdwood { 308a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 309414c70cbSLiam Girdwood ssize_t ret; 310414c70cbSLiam Girdwood 311414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 312414c70cbSLiam Girdwood ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 313414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 314414c70cbSLiam Girdwood 315414c70cbSLiam Girdwood return ret; 316414c70cbSLiam Girdwood } 3177ad68e2fSDavid Brownell static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 318414c70cbSLiam Girdwood 319414c70cbSLiam Girdwood static ssize_t regulator_uA_show(struct device *dev, 320414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 321414c70cbSLiam Girdwood { 322a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 323414c70cbSLiam Girdwood 324414c70cbSLiam Girdwood return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 325414c70cbSLiam Girdwood } 3267ad68e2fSDavid Brownell static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 327414c70cbSLiam Girdwood 328bc558a60SMark Brown static ssize_t regulator_name_show(struct device *dev, 329bc558a60SMark Brown struct device_attribute *attr, char *buf) 330bc558a60SMark Brown { 331bc558a60SMark Brown struct regulator_dev *rdev = dev_get_drvdata(dev); 332bc558a60SMark Brown 3331083c393SMark Brown return sprintf(buf, "%s\n", rdev_get_name(rdev)); 334bc558a60SMark Brown } 335bc558a60SMark Brown 3364fca9545SDavid Brownell static ssize_t regulator_print_opmode(char *buf, int mode) 337414c70cbSLiam Girdwood { 338414c70cbSLiam Girdwood switch (mode) { 339414c70cbSLiam Girdwood case REGULATOR_MODE_FAST: 340414c70cbSLiam Girdwood return sprintf(buf, "fast\n"); 341414c70cbSLiam Girdwood case REGULATOR_MODE_NORMAL: 342414c70cbSLiam Girdwood return sprintf(buf, "normal\n"); 343414c70cbSLiam Girdwood case REGULATOR_MODE_IDLE: 344414c70cbSLiam Girdwood return sprintf(buf, "idle\n"); 345414c70cbSLiam Girdwood case REGULATOR_MODE_STANDBY: 346414c70cbSLiam Girdwood return sprintf(buf, "standby\n"); 347414c70cbSLiam Girdwood } 348414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 349414c70cbSLiam Girdwood } 350414c70cbSLiam Girdwood 3514fca9545SDavid Brownell static ssize_t regulator_opmode_show(struct device *dev, 352414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 353414c70cbSLiam Girdwood { 354a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 355414c70cbSLiam Girdwood 3564fca9545SDavid Brownell return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 3574fca9545SDavid Brownell } 3587ad68e2fSDavid Brownell static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 3594fca9545SDavid Brownell 3604fca9545SDavid Brownell static ssize_t regulator_print_state(char *buf, int state) 3614fca9545SDavid Brownell { 362414c70cbSLiam Girdwood if (state > 0) 363414c70cbSLiam Girdwood return sprintf(buf, "enabled\n"); 364414c70cbSLiam Girdwood else if (state == 0) 365414c70cbSLiam Girdwood return sprintf(buf, "disabled\n"); 366414c70cbSLiam Girdwood else 367414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 368414c70cbSLiam Girdwood } 369414c70cbSLiam Girdwood 3704fca9545SDavid Brownell static ssize_t regulator_state_show(struct device *dev, 3714fca9545SDavid Brownell struct device_attribute *attr, char *buf) 3724fca9545SDavid Brownell { 3734fca9545SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 3749332546fSMark Brown ssize_t ret; 3754fca9545SDavid Brownell 3769332546fSMark Brown mutex_lock(&rdev->mutex); 3779332546fSMark Brown ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 3789332546fSMark Brown mutex_unlock(&rdev->mutex); 3799332546fSMark Brown 3809332546fSMark Brown return ret; 3814fca9545SDavid Brownell } 3827ad68e2fSDavid Brownell static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 3834fca9545SDavid Brownell 384853116a1SDavid Brownell static ssize_t regulator_status_show(struct device *dev, 385853116a1SDavid Brownell struct device_attribute *attr, char *buf) 386853116a1SDavid Brownell { 387853116a1SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 388853116a1SDavid Brownell int status; 389853116a1SDavid Brownell char *label; 390853116a1SDavid Brownell 391853116a1SDavid Brownell status = rdev->desc->ops->get_status(rdev); 392853116a1SDavid Brownell if (status < 0) 393853116a1SDavid Brownell return status; 394853116a1SDavid Brownell 395853116a1SDavid Brownell switch (status) { 396853116a1SDavid Brownell case REGULATOR_STATUS_OFF: 397853116a1SDavid Brownell label = "off"; 398853116a1SDavid Brownell break; 399853116a1SDavid Brownell case REGULATOR_STATUS_ON: 400853116a1SDavid Brownell label = "on"; 401853116a1SDavid Brownell break; 402853116a1SDavid Brownell case REGULATOR_STATUS_ERROR: 403853116a1SDavid Brownell label = "error"; 404853116a1SDavid Brownell break; 405853116a1SDavid Brownell case REGULATOR_STATUS_FAST: 406853116a1SDavid Brownell label = "fast"; 407853116a1SDavid Brownell break; 408853116a1SDavid Brownell case REGULATOR_STATUS_NORMAL: 409853116a1SDavid Brownell label = "normal"; 410853116a1SDavid Brownell break; 411853116a1SDavid Brownell case REGULATOR_STATUS_IDLE: 412853116a1SDavid Brownell label = "idle"; 413853116a1SDavid Brownell break; 414853116a1SDavid Brownell case REGULATOR_STATUS_STANDBY: 415853116a1SDavid Brownell label = "standby"; 416853116a1SDavid Brownell break; 417853116a1SDavid Brownell default: 418853116a1SDavid Brownell return -ERANGE; 419853116a1SDavid Brownell } 420853116a1SDavid Brownell 421853116a1SDavid Brownell return sprintf(buf, "%s\n", label); 422853116a1SDavid Brownell } 423853116a1SDavid Brownell static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 424853116a1SDavid Brownell 425414c70cbSLiam Girdwood static ssize_t regulator_min_uA_show(struct device *dev, 426414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 427414c70cbSLiam Girdwood { 428a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 429414c70cbSLiam Girdwood 430414c70cbSLiam Girdwood if (!rdev->constraints) 431414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 432414c70cbSLiam Girdwood 433414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uA); 434414c70cbSLiam Girdwood } 4357ad68e2fSDavid Brownell static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 436414c70cbSLiam Girdwood 437414c70cbSLiam Girdwood static ssize_t regulator_max_uA_show(struct device *dev, 438414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 439414c70cbSLiam Girdwood { 440a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 441414c70cbSLiam Girdwood 442414c70cbSLiam Girdwood if (!rdev->constraints) 443414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 444414c70cbSLiam Girdwood 445414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uA); 446414c70cbSLiam Girdwood } 4477ad68e2fSDavid Brownell static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 448414c70cbSLiam Girdwood 449414c70cbSLiam Girdwood static ssize_t regulator_min_uV_show(struct device *dev, 450414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 451414c70cbSLiam Girdwood { 452a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 453414c70cbSLiam Girdwood 454414c70cbSLiam Girdwood if (!rdev->constraints) 455414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 456414c70cbSLiam Girdwood 457414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uV); 458414c70cbSLiam Girdwood } 4597ad68e2fSDavid Brownell static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 460414c70cbSLiam Girdwood 461414c70cbSLiam Girdwood static ssize_t regulator_max_uV_show(struct device *dev, 462414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 463414c70cbSLiam Girdwood { 464a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 465414c70cbSLiam Girdwood 466414c70cbSLiam Girdwood if (!rdev->constraints) 467414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 468414c70cbSLiam Girdwood 469414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uV); 470414c70cbSLiam Girdwood } 4717ad68e2fSDavid Brownell static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 472414c70cbSLiam Girdwood 473414c70cbSLiam Girdwood static ssize_t regulator_total_uA_show(struct device *dev, 474414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 475414c70cbSLiam Girdwood { 476a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 477414c70cbSLiam Girdwood struct regulator *regulator; 478414c70cbSLiam Girdwood int uA = 0; 479414c70cbSLiam Girdwood 480414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 481414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) 482414c70cbSLiam Girdwood uA += regulator->uA_load; 483414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 484414c70cbSLiam Girdwood return sprintf(buf, "%d\n", uA); 485414c70cbSLiam Girdwood } 4867ad68e2fSDavid Brownell static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 487414c70cbSLiam Girdwood 488414c70cbSLiam Girdwood static ssize_t regulator_num_users_show(struct device *dev, 489414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 490414c70cbSLiam Girdwood { 491a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 492414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->use_count); 493414c70cbSLiam Girdwood } 494414c70cbSLiam Girdwood 495414c70cbSLiam Girdwood static ssize_t regulator_type_show(struct device *dev, 496414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 497414c70cbSLiam Girdwood { 498a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 499414c70cbSLiam Girdwood 500414c70cbSLiam Girdwood switch (rdev->desc->type) { 501414c70cbSLiam Girdwood case REGULATOR_VOLTAGE: 502414c70cbSLiam Girdwood return sprintf(buf, "voltage\n"); 503414c70cbSLiam Girdwood case REGULATOR_CURRENT: 504414c70cbSLiam Girdwood return sprintf(buf, "current\n"); 505414c70cbSLiam Girdwood } 506414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 507414c70cbSLiam Girdwood } 508414c70cbSLiam Girdwood 509414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 510414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 511414c70cbSLiam Girdwood { 512a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 513414c70cbSLiam Girdwood 514414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 515414c70cbSLiam Girdwood } 5167ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_microvolts, 0444, 5177ad68e2fSDavid Brownell regulator_suspend_mem_uV_show, NULL); 518414c70cbSLiam Girdwood 519414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 520414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 521414c70cbSLiam Girdwood { 522a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 523414c70cbSLiam Girdwood 524414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 525414c70cbSLiam Girdwood } 5267ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_microvolts, 0444, 5277ad68e2fSDavid Brownell regulator_suspend_disk_uV_show, NULL); 528414c70cbSLiam Girdwood 529414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 530414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 531414c70cbSLiam Girdwood { 532a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 533414c70cbSLiam Girdwood 534414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 535414c70cbSLiam Girdwood } 5367ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_microvolts, 0444, 5377ad68e2fSDavid Brownell regulator_suspend_standby_uV_show, NULL); 538414c70cbSLiam Girdwood 539414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 540414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 541414c70cbSLiam Girdwood { 542a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 543414c70cbSLiam Girdwood 5444fca9545SDavid Brownell return regulator_print_opmode(buf, 5454fca9545SDavid Brownell rdev->constraints->state_mem.mode); 546414c70cbSLiam Girdwood } 5477ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_mode, 0444, 5487ad68e2fSDavid Brownell regulator_suspend_mem_mode_show, NULL); 549414c70cbSLiam Girdwood 550414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 551414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 552414c70cbSLiam Girdwood { 553a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 554414c70cbSLiam Girdwood 5554fca9545SDavid Brownell return regulator_print_opmode(buf, 5564fca9545SDavid Brownell rdev->constraints->state_disk.mode); 557414c70cbSLiam Girdwood } 5587ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_mode, 0444, 5597ad68e2fSDavid Brownell regulator_suspend_disk_mode_show, NULL); 560414c70cbSLiam Girdwood 561414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 562414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 563414c70cbSLiam Girdwood { 564a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 565414c70cbSLiam Girdwood 5664fca9545SDavid Brownell return regulator_print_opmode(buf, 5674fca9545SDavid Brownell rdev->constraints->state_standby.mode); 568414c70cbSLiam Girdwood } 5697ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_mode, 0444, 5707ad68e2fSDavid Brownell regulator_suspend_standby_mode_show, NULL); 571414c70cbSLiam Girdwood 572414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_state_show(struct device *dev, 573414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 574414c70cbSLiam Girdwood { 575a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 576414c70cbSLiam Girdwood 5774fca9545SDavid Brownell return regulator_print_state(buf, 5784fca9545SDavid Brownell rdev->constraints->state_mem.enabled); 579414c70cbSLiam Girdwood } 5807ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_state, 0444, 5817ad68e2fSDavid Brownell regulator_suspend_mem_state_show, NULL); 582414c70cbSLiam Girdwood 583414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_state_show(struct device *dev, 584414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 585414c70cbSLiam Girdwood { 586a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 587414c70cbSLiam Girdwood 5884fca9545SDavid Brownell return regulator_print_state(buf, 5894fca9545SDavid Brownell rdev->constraints->state_disk.enabled); 590414c70cbSLiam Girdwood } 5917ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_state, 0444, 5927ad68e2fSDavid Brownell regulator_suspend_disk_state_show, NULL); 593414c70cbSLiam Girdwood 594414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_state_show(struct device *dev, 595414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 596414c70cbSLiam Girdwood { 597a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 598414c70cbSLiam Girdwood 5994fca9545SDavid Brownell return regulator_print_state(buf, 6004fca9545SDavid Brownell rdev->constraints->state_standby.enabled); 601414c70cbSLiam Girdwood } 6027ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_state, 0444, 6037ad68e2fSDavid Brownell regulator_suspend_standby_state_show, NULL); 604bc558a60SMark Brown 6057ad68e2fSDavid Brownell 6067ad68e2fSDavid Brownell /* 6077ad68e2fSDavid Brownell * These are the only attributes are present for all regulators. 6087ad68e2fSDavid Brownell * Other attributes are a function of regulator functionality. 6097ad68e2fSDavid Brownell */ 610414c70cbSLiam Girdwood static struct device_attribute regulator_dev_attrs[] = { 611bc558a60SMark Brown __ATTR(name, 0444, regulator_name_show, NULL), 612414c70cbSLiam Girdwood __ATTR(num_users, 0444, regulator_num_users_show, NULL), 613414c70cbSLiam Girdwood __ATTR(type, 0444, regulator_type_show, NULL), 614414c70cbSLiam Girdwood __ATTR_NULL, 615414c70cbSLiam Girdwood }; 616414c70cbSLiam Girdwood 617414c70cbSLiam Girdwood static void regulator_dev_release(struct device *dev) 618414c70cbSLiam Girdwood { 619a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 620414c70cbSLiam Girdwood kfree(rdev); 621414c70cbSLiam Girdwood } 622414c70cbSLiam Girdwood 623414c70cbSLiam Girdwood static struct class regulator_class = { 624414c70cbSLiam Girdwood .name = "regulator", 625414c70cbSLiam Girdwood .dev_release = regulator_dev_release, 626414c70cbSLiam Girdwood .dev_attrs = regulator_dev_attrs, 627414c70cbSLiam Girdwood }; 628414c70cbSLiam Girdwood 629414c70cbSLiam Girdwood /* Calculate the new optimum regulator operating mode based on the new total 630414c70cbSLiam Girdwood * consumer load. All locks held by caller */ 631414c70cbSLiam Girdwood static void drms_uA_update(struct regulator_dev *rdev) 632414c70cbSLiam Girdwood { 633414c70cbSLiam Girdwood struct regulator *sibling; 634414c70cbSLiam Girdwood int current_uA = 0, output_uV, input_uV, err; 635414c70cbSLiam Girdwood unsigned int mode; 636414c70cbSLiam Girdwood 637414c70cbSLiam Girdwood err = regulator_check_drms(rdev); 638414c70cbSLiam Girdwood if (err < 0 || !rdev->desc->ops->get_optimum_mode || 639476c2d83SMark Brown (!rdev->desc->ops->get_voltage && 640476c2d83SMark Brown !rdev->desc->ops->get_voltage_sel) || 641476c2d83SMark Brown !rdev->desc->ops->set_mode) 642414c70cbSLiam Girdwood return; 643414c70cbSLiam Girdwood 644414c70cbSLiam Girdwood /* get output voltage */ 6451bf5a1f8SMark Brown output_uV = _regulator_get_voltage(rdev); 646414c70cbSLiam Girdwood if (output_uV <= 0) 647414c70cbSLiam Girdwood return; 648414c70cbSLiam Girdwood 649414c70cbSLiam Girdwood /* get input voltage */ 6501bf5a1f8SMark Brown input_uV = 0; 6511bf5a1f8SMark Brown if (rdev->supply) 6521bf5a1f8SMark Brown input_uV = _regulator_get_voltage(rdev); 6531bf5a1f8SMark Brown if (input_uV <= 0) 654414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 655414c70cbSLiam Girdwood if (input_uV <= 0) 656414c70cbSLiam Girdwood return; 657414c70cbSLiam Girdwood 658414c70cbSLiam Girdwood /* calc total requested load */ 659414c70cbSLiam Girdwood list_for_each_entry(sibling, &rdev->consumer_list, list) 660414c70cbSLiam Girdwood current_uA += sibling->uA_load; 661414c70cbSLiam Girdwood 662414c70cbSLiam Girdwood /* now get the optimum mode for our new total regulator load */ 663414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 664414c70cbSLiam Girdwood output_uV, current_uA); 665414c70cbSLiam Girdwood 666414c70cbSLiam Girdwood /* check the new mode is allowed */ 6672c608234SMark Brown err = regulator_mode_constrain(rdev, &mode); 668414c70cbSLiam Girdwood if (err == 0) 669414c70cbSLiam Girdwood rdev->desc->ops->set_mode(rdev, mode); 670414c70cbSLiam Girdwood } 671414c70cbSLiam Girdwood 672414c70cbSLiam Girdwood static int suspend_set_state(struct regulator_dev *rdev, 673414c70cbSLiam Girdwood struct regulator_state *rstate) 674414c70cbSLiam Girdwood { 675414c70cbSLiam Girdwood int ret = 0; 676638f85c5SMark Brown bool can_set_state; 677414c70cbSLiam Girdwood 678638f85c5SMark Brown can_set_state = rdev->desc->ops->set_suspend_enable && 679638f85c5SMark Brown rdev->desc->ops->set_suspend_disable; 680638f85c5SMark Brown 681638f85c5SMark Brown /* If we have no suspend mode configration don't set anything; 682638f85c5SMark Brown * only warn if the driver actually makes the suspend mode 683638f85c5SMark Brown * configurable. 684638f85c5SMark Brown */ 685638f85c5SMark Brown if (!rstate->enabled && !rstate->disabled) { 686638f85c5SMark Brown if (can_set_state) 6875da84fd9SJoe Perches rdev_warn(rdev, "No configuration\n"); 688638f85c5SMark Brown return 0; 689638f85c5SMark Brown } 690638f85c5SMark Brown 691638f85c5SMark Brown if (rstate->enabled && rstate->disabled) { 6925da84fd9SJoe Perches rdev_err(rdev, "invalid configuration\n"); 693638f85c5SMark Brown return -EINVAL; 694638f85c5SMark Brown } 695638f85c5SMark Brown 696638f85c5SMark Brown if (!can_set_state) { 6975da84fd9SJoe Perches rdev_err(rdev, "no way to set suspend state\n"); 698414c70cbSLiam Girdwood return -EINVAL; 699a5766f11SLiam Girdwood } 700414c70cbSLiam Girdwood 701414c70cbSLiam Girdwood if (rstate->enabled) 702414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_enable(rdev); 703414c70cbSLiam Girdwood else 704414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_disable(rdev); 705414c70cbSLiam Girdwood if (ret < 0) { 7065da84fd9SJoe Perches rdev_err(rdev, "failed to enabled/disable\n"); 707414c70cbSLiam Girdwood return ret; 708414c70cbSLiam Girdwood } 709414c70cbSLiam Girdwood 710414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 711414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 712414c70cbSLiam Girdwood if (ret < 0) { 7135da84fd9SJoe Perches rdev_err(rdev, "failed to set voltage\n"); 714414c70cbSLiam Girdwood return ret; 715414c70cbSLiam Girdwood } 716414c70cbSLiam Girdwood } 717414c70cbSLiam Girdwood 718414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 719414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 720414c70cbSLiam Girdwood if (ret < 0) { 7215da84fd9SJoe Perches rdev_err(rdev, "failed to set mode\n"); 722414c70cbSLiam Girdwood return ret; 723414c70cbSLiam Girdwood } 724414c70cbSLiam Girdwood } 725414c70cbSLiam Girdwood return ret; 726414c70cbSLiam Girdwood } 727414c70cbSLiam Girdwood 728414c70cbSLiam Girdwood /* locks held by caller */ 729414c70cbSLiam Girdwood static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 730414c70cbSLiam Girdwood { 731414c70cbSLiam Girdwood if (!rdev->constraints) 732414c70cbSLiam Girdwood return -EINVAL; 733414c70cbSLiam Girdwood 734414c70cbSLiam Girdwood switch (state) { 735414c70cbSLiam Girdwood case PM_SUSPEND_STANDBY: 736414c70cbSLiam Girdwood return suspend_set_state(rdev, 737414c70cbSLiam Girdwood &rdev->constraints->state_standby); 738414c70cbSLiam Girdwood case PM_SUSPEND_MEM: 739414c70cbSLiam Girdwood return suspend_set_state(rdev, 740414c70cbSLiam Girdwood &rdev->constraints->state_mem); 741414c70cbSLiam Girdwood case PM_SUSPEND_MAX: 742414c70cbSLiam Girdwood return suspend_set_state(rdev, 743414c70cbSLiam Girdwood &rdev->constraints->state_disk); 744414c70cbSLiam Girdwood default: 745414c70cbSLiam Girdwood return -EINVAL; 746414c70cbSLiam Girdwood } 747414c70cbSLiam Girdwood } 748414c70cbSLiam Girdwood 749414c70cbSLiam Girdwood static void print_constraints(struct regulator_dev *rdev) 750414c70cbSLiam Girdwood { 751414c70cbSLiam Girdwood struct regulation_constraints *constraints = rdev->constraints; 752973e9a27SMark Brown char buf[80] = ""; 7538f031b48SMark Brown int count = 0; 7548f031b48SMark Brown int ret; 755414c70cbSLiam Girdwood 7568f031b48SMark Brown if (constraints->min_uV && constraints->max_uV) { 757414c70cbSLiam Girdwood if (constraints->min_uV == constraints->max_uV) 7588f031b48SMark Brown count += sprintf(buf + count, "%d mV ", 759414c70cbSLiam Girdwood constraints->min_uV / 1000); 760414c70cbSLiam Girdwood else 7618f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mV ", 762414c70cbSLiam Girdwood constraints->min_uV / 1000, 763414c70cbSLiam Girdwood constraints->max_uV / 1000); 7648f031b48SMark Brown } 7658f031b48SMark Brown 7668f031b48SMark Brown if (!constraints->min_uV || 7678f031b48SMark Brown constraints->min_uV != constraints->max_uV) { 7688f031b48SMark Brown ret = _regulator_get_voltage(rdev); 7698f031b48SMark Brown if (ret > 0) 7708f031b48SMark Brown count += sprintf(buf + count, "at %d mV ", ret / 1000); 7718f031b48SMark Brown } 7728f031b48SMark Brown 773bf5892a8SMark Brown if (constraints->uV_offset) 774bf5892a8SMark Brown count += sprintf(buf, "%dmV offset ", 775bf5892a8SMark Brown constraints->uV_offset / 1000); 776bf5892a8SMark Brown 7778f031b48SMark Brown if (constraints->min_uA && constraints->max_uA) { 778414c70cbSLiam Girdwood if (constraints->min_uA == constraints->max_uA) 7798f031b48SMark Brown count += sprintf(buf + count, "%d mA ", 780414c70cbSLiam Girdwood constraints->min_uA / 1000); 781414c70cbSLiam Girdwood else 7828f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mA ", 783414c70cbSLiam Girdwood constraints->min_uA / 1000, 784414c70cbSLiam Girdwood constraints->max_uA / 1000); 785414c70cbSLiam Girdwood } 7868f031b48SMark Brown 7878f031b48SMark Brown if (!constraints->min_uA || 7888f031b48SMark Brown constraints->min_uA != constraints->max_uA) { 7898f031b48SMark Brown ret = _regulator_get_current_limit(rdev); 7908f031b48SMark Brown if (ret > 0) 791e4a6376bSCyril Chemparathy count += sprintf(buf + count, "at %d mA ", ret / 1000); 7928f031b48SMark Brown } 7938f031b48SMark Brown 794414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 795414c70cbSLiam Girdwood count += sprintf(buf + count, "fast "); 796414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 797414c70cbSLiam Girdwood count += sprintf(buf + count, "normal "); 798414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 799414c70cbSLiam Girdwood count += sprintf(buf + count, "idle "); 800414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 801414c70cbSLiam Girdwood count += sprintf(buf + count, "standby"); 802414c70cbSLiam Girdwood 80313ce29f8SMark Brown rdev_info(rdev, "%s\n", buf); 8044a682922SMark Brown 8054a682922SMark Brown if ((constraints->min_uV != constraints->max_uV) && 8064a682922SMark Brown !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) 8074a682922SMark Brown rdev_warn(rdev, 8084a682922SMark Brown "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); 809414c70cbSLiam Girdwood } 810414c70cbSLiam Girdwood 811e79055d6SMark Brown static int machine_constraints_voltage(struct regulator_dev *rdev, 8121083c393SMark Brown struct regulation_constraints *constraints) 813e79055d6SMark Brown { 814e79055d6SMark Brown struct regulator_ops *ops = rdev->desc->ops; 815af5866c9SMark Brown int ret; 816af5866c9SMark Brown 817af5866c9SMark Brown /* do we need to apply the constraint voltage */ 818af5866c9SMark Brown if (rdev->constraints->apply_uV && 81975790251SMark Brown rdev->constraints->min_uV == rdev->constraints->max_uV) { 82075790251SMark Brown ret = _regulator_do_set_voltage(rdev, 8213a93f2a9SMark Brown rdev->constraints->min_uV, 82275790251SMark Brown rdev->constraints->max_uV); 823af5866c9SMark Brown if (ret < 0) { 8245da84fd9SJoe Perches rdev_err(rdev, "failed to apply %duV constraint\n", 8255da84fd9SJoe Perches rdev->constraints->min_uV); 826af5866c9SMark Brown return ret; 827af5866c9SMark Brown } 828af5866c9SMark Brown } 829e79055d6SMark Brown 830e79055d6SMark Brown /* constrain machine-level voltage specs to fit 831e79055d6SMark Brown * the actual range supported by this regulator. 832e79055d6SMark Brown */ 833e79055d6SMark Brown if (ops->list_voltage && rdev->desc->n_voltages) { 834e79055d6SMark Brown int count = rdev->desc->n_voltages; 835e79055d6SMark Brown int i; 836e79055d6SMark Brown int min_uV = INT_MAX; 837e79055d6SMark Brown int max_uV = INT_MIN; 838e79055d6SMark Brown int cmin = constraints->min_uV; 839e79055d6SMark Brown int cmax = constraints->max_uV; 840e79055d6SMark Brown 841e79055d6SMark Brown /* it's safe to autoconfigure fixed-voltage supplies 842e79055d6SMark Brown and the constraints are used by list_voltage. */ 843e79055d6SMark Brown if (count == 1 && !cmin) { 844e79055d6SMark Brown cmin = 1; 845e79055d6SMark Brown cmax = INT_MAX; 846e79055d6SMark Brown constraints->min_uV = cmin; 847e79055d6SMark Brown constraints->max_uV = cmax; 848e79055d6SMark Brown } 849e79055d6SMark Brown 850e79055d6SMark Brown /* voltage constraints are optional */ 851e79055d6SMark Brown if ((cmin == 0) && (cmax == 0)) 852e79055d6SMark Brown return 0; 853e79055d6SMark Brown 854e79055d6SMark Brown /* else require explicit machine-level constraints */ 855e79055d6SMark Brown if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 8565da84fd9SJoe Perches rdev_err(rdev, "invalid voltage constraints\n"); 857e79055d6SMark Brown return -EINVAL; 858e79055d6SMark Brown } 859e79055d6SMark Brown 860e79055d6SMark Brown /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 861e79055d6SMark Brown for (i = 0; i < count; i++) { 862e79055d6SMark Brown int value; 863e79055d6SMark Brown 864e79055d6SMark Brown value = ops->list_voltage(rdev, i); 865e79055d6SMark Brown if (value <= 0) 866e79055d6SMark Brown continue; 867e79055d6SMark Brown 868e79055d6SMark Brown /* maybe adjust [min_uV..max_uV] */ 869e79055d6SMark Brown if (value >= cmin && value < min_uV) 870e79055d6SMark Brown min_uV = value; 871e79055d6SMark Brown if (value <= cmax && value > max_uV) 872e79055d6SMark Brown max_uV = value; 873e79055d6SMark Brown } 874e79055d6SMark Brown 875e79055d6SMark Brown /* final: [min_uV..max_uV] valid iff constraints valid */ 876e79055d6SMark Brown if (max_uV < min_uV) { 8775da84fd9SJoe Perches rdev_err(rdev, "unsupportable voltage constraints\n"); 878e79055d6SMark Brown return -EINVAL; 879e79055d6SMark Brown } 880e79055d6SMark Brown 881e79055d6SMark Brown /* use regulator's subset of machine constraints */ 882e79055d6SMark Brown if (constraints->min_uV < min_uV) { 8835da84fd9SJoe Perches rdev_dbg(rdev, "override min_uV, %d -> %d\n", 8845da84fd9SJoe Perches constraints->min_uV, min_uV); 885e79055d6SMark Brown constraints->min_uV = min_uV; 886e79055d6SMark Brown } 887e79055d6SMark Brown if (constraints->max_uV > max_uV) { 8885da84fd9SJoe Perches rdev_dbg(rdev, "override max_uV, %d -> %d\n", 8895da84fd9SJoe Perches constraints->max_uV, max_uV); 890e79055d6SMark Brown constraints->max_uV = max_uV; 891e79055d6SMark Brown } 892e79055d6SMark Brown } 893e79055d6SMark Brown 894e79055d6SMark Brown return 0; 895e79055d6SMark Brown } 896e79055d6SMark Brown 897a5766f11SLiam Girdwood /** 898a5766f11SLiam Girdwood * set_machine_constraints - sets regulator constraints 89969279fb9SMark Brown * @rdev: regulator source 900c8e7e464SMark Brown * @constraints: constraints to apply 901a5766f11SLiam Girdwood * 902a5766f11SLiam Girdwood * Allows platform initialisation code to define and constrain 903a5766f11SLiam Girdwood * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 904a5766f11SLiam Girdwood * Constraints *must* be set by platform code in order for some 905a5766f11SLiam Girdwood * regulator operations to proceed i.e. set_voltage, set_current_limit, 906a5766f11SLiam Girdwood * set_mode. 907a5766f11SLiam Girdwood */ 908a5766f11SLiam Girdwood static int set_machine_constraints(struct regulator_dev *rdev, 909f8c12fe3SMark Brown const struct regulation_constraints *constraints) 910a5766f11SLiam Girdwood { 911a5766f11SLiam Girdwood int ret = 0; 912e5fda26cSMark Brown struct regulator_ops *ops = rdev->desc->ops; 913e06f5b4fSMark Brown 9149a8f5e07SMark Brown if (constraints) 915f8c12fe3SMark Brown rdev->constraints = kmemdup(constraints, sizeof(*constraints), 916f8c12fe3SMark Brown GFP_KERNEL); 9179a8f5e07SMark Brown else 9189a8f5e07SMark Brown rdev->constraints = kzalloc(sizeof(*constraints), 9199a8f5e07SMark Brown GFP_KERNEL); 920f8c12fe3SMark Brown if (!rdev->constraints) 921f8c12fe3SMark Brown return -ENOMEM; 922af5866c9SMark Brown 923f8c12fe3SMark Brown ret = machine_constraints_voltage(rdev, rdev->constraints); 924e79055d6SMark Brown if (ret != 0) 9253e2b9abdSMark Brown goto out; 9263e2b9abdSMark Brown 927a5766f11SLiam Girdwood /* do we need to setup our suspend state */ 9289a8f5e07SMark Brown if (rdev->constraints->initial_state) { 929f8c12fe3SMark Brown ret = suspend_prepare(rdev, rdev->constraints->initial_state); 930e06f5b4fSMark Brown if (ret < 0) { 9315da84fd9SJoe Perches rdev_err(rdev, "failed to set suspend state\n"); 932e06f5b4fSMark Brown goto out; 933e06f5b4fSMark Brown } 934e06f5b4fSMark Brown } 935a5766f11SLiam Girdwood 9369a8f5e07SMark Brown if (rdev->constraints->initial_mode) { 937a308466cSMark Brown if (!ops->set_mode) { 9385da84fd9SJoe Perches rdev_err(rdev, "no set_mode operation\n"); 939a308466cSMark Brown ret = -EINVAL; 940a308466cSMark Brown goto out; 941a308466cSMark Brown } 942a308466cSMark Brown 943f8c12fe3SMark Brown ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 944a308466cSMark Brown if (ret < 0) { 9455da84fd9SJoe Perches rdev_err(rdev, "failed to set initial mode: %d\n", ret); 946a308466cSMark Brown goto out; 947a308466cSMark Brown } 948a308466cSMark Brown } 949a308466cSMark Brown 950cacf90f2SMark Brown /* If the constraints say the regulator should be on at this point 951cacf90f2SMark Brown * and we have control then make sure it is enabled. 952cacf90f2SMark Brown */ 953f8c12fe3SMark Brown if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 954f8c12fe3SMark Brown ops->enable) { 955e5fda26cSMark Brown ret = ops->enable(rdev); 956e5fda26cSMark Brown if (ret < 0) { 9575da84fd9SJoe Perches rdev_err(rdev, "failed to enable\n"); 958e5fda26cSMark Brown goto out; 959e5fda26cSMark Brown } 960e5fda26cSMark Brown } 961e5fda26cSMark Brown 962a5766f11SLiam Girdwood print_constraints(rdev); 9631a6958e7SAxel Lin return 0; 964a5766f11SLiam Girdwood out: 9651a6958e7SAxel Lin kfree(rdev->constraints); 9661a6958e7SAxel Lin rdev->constraints = NULL; 967a5766f11SLiam Girdwood return ret; 968a5766f11SLiam Girdwood } 969a5766f11SLiam Girdwood 970a5766f11SLiam Girdwood /** 971a5766f11SLiam Girdwood * set_supply - set regulator supply regulator 97269279fb9SMark Brown * @rdev: regulator name 97369279fb9SMark Brown * @supply_rdev: supply regulator name 974a5766f11SLiam Girdwood * 975a5766f11SLiam Girdwood * Called by platform initialisation code to set the supply regulator for this 976a5766f11SLiam Girdwood * regulator. This ensures that a regulators supply will also be enabled by the 977a5766f11SLiam Girdwood * core if it's child is enabled. 978a5766f11SLiam Girdwood */ 979a5766f11SLiam Girdwood static int set_supply(struct regulator_dev *rdev, 980a5766f11SLiam Girdwood struct regulator_dev *supply_rdev) 981a5766f11SLiam Girdwood { 982a5766f11SLiam Girdwood int err; 983a5766f11SLiam Girdwood 9843801b86aSMark Brown rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 9853801b86aSMark Brown 9863801b86aSMark Brown rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 98732c78de8SAxel Lin if (rdev->supply == NULL) { 98832c78de8SAxel Lin err = -ENOMEM; 989a5766f11SLiam Girdwood return err; 990a5766f11SLiam Girdwood } 991a5766f11SLiam Girdwood 9923801b86aSMark Brown return 0; 9933801b86aSMark Brown } 9943801b86aSMark Brown 995a5766f11SLiam Girdwood /** 99606c63f93SRandy Dunlap * set_consumer_device_supply - Bind a regulator to a symbolic supply 99769279fb9SMark Brown * @rdev: regulator source 99869279fb9SMark Brown * @consumer_dev: device the supply applies to 99940f9244fSMark Brown * @consumer_dev_name: dev_name() string for device supply applies to 1000a5766f11SLiam Girdwood * @supply: symbolic name for supply 1001a5766f11SLiam Girdwood * 1002a5766f11SLiam Girdwood * Allows platform initialisation code to map physical regulator 1003a5766f11SLiam Girdwood * sources to symbolic names for supplies for use by devices. Devices 1004a5766f11SLiam Girdwood * should use these symbolic names to request regulators, avoiding the 1005a5766f11SLiam Girdwood * need to provide board-specific regulator names as platform data. 100640f9244fSMark Brown * 100740f9244fSMark Brown * Only one of consumer_dev and consumer_dev_name may be specified. 1008a5766f11SLiam Girdwood */ 1009a5766f11SLiam Girdwood static int set_consumer_device_supply(struct regulator_dev *rdev, 101040f9244fSMark Brown struct device *consumer_dev, const char *consumer_dev_name, 101140f9244fSMark Brown const char *supply) 1012a5766f11SLiam Girdwood { 1013a5766f11SLiam Girdwood struct regulator_map *node; 10149ed2099eSMark Brown int has_dev; 1015a5766f11SLiam Girdwood 101640f9244fSMark Brown if (consumer_dev && consumer_dev_name) 101740f9244fSMark Brown return -EINVAL; 101840f9244fSMark Brown 101940f9244fSMark Brown if (!consumer_dev_name && consumer_dev) 102040f9244fSMark Brown consumer_dev_name = dev_name(consumer_dev); 102140f9244fSMark Brown 1022a5766f11SLiam Girdwood if (supply == NULL) 1023a5766f11SLiam Girdwood return -EINVAL; 1024a5766f11SLiam Girdwood 10259ed2099eSMark Brown if (consumer_dev_name != NULL) 10269ed2099eSMark Brown has_dev = 1; 10279ed2099eSMark Brown else 10289ed2099eSMark Brown has_dev = 0; 10299ed2099eSMark Brown 10306001e13cSDavid Brownell list_for_each_entry(node, ®ulator_map_list, list) { 103123b5cc2aSJani Nikula if (node->dev_name && consumer_dev_name) { 103223b5cc2aSJani Nikula if (strcmp(node->dev_name, consumer_dev_name) != 0) 10336001e13cSDavid Brownell continue; 103423b5cc2aSJani Nikula } else if (node->dev_name || consumer_dev_name) { 103523b5cc2aSJani Nikula continue; 103623b5cc2aSJani Nikula } 103723b5cc2aSJani Nikula 10386001e13cSDavid Brownell if (strcmp(node->supply, supply) != 0) 10396001e13cSDavid Brownell continue; 10406001e13cSDavid Brownell 10416001e13cSDavid Brownell dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 10426001e13cSDavid Brownell dev_name(&node->regulator->dev), 10436001e13cSDavid Brownell node->regulator->desc->name, 10446001e13cSDavid Brownell supply, 10451083c393SMark Brown dev_name(&rdev->dev), rdev_get_name(rdev)); 10466001e13cSDavid Brownell return -EBUSY; 10476001e13cSDavid Brownell } 10486001e13cSDavid Brownell 10499ed2099eSMark Brown node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1050a5766f11SLiam Girdwood if (node == NULL) 1051a5766f11SLiam Girdwood return -ENOMEM; 1052a5766f11SLiam Girdwood 1053a5766f11SLiam Girdwood node->regulator = rdev; 1054a5766f11SLiam Girdwood node->supply = supply; 1055a5766f11SLiam Girdwood 10569ed2099eSMark Brown if (has_dev) { 10579ed2099eSMark Brown node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 105840f9244fSMark Brown if (node->dev_name == NULL) { 105940f9244fSMark Brown kfree(node); 106040f9244fSMark Brown return -ENOMEM; 106140f9244fSMark Brown } 10629ed2099eSMark Brown } 106340f9244fSMark Brown 1064a5766f11SLiam Girdwood list_add(&node->list, ®ulator_map_list); 1065a5766f11SLiam Girdwood return 0; 1066a5766f11SLiam Girdwood } 1067a5766f11SLiam Girdwood 10680f1d747bSMike Rapoport static void unset_regulator_supplies(struct regulator_dev *rdev) 10690f1d747bSMike Rapoport { 10700f1d747bSMike Rapoport struct regulator_map *node, *n; 10710f1d747bSMike Rapoport 10720f1d747bSMike Rapoport list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 10730f1d747bSMike Rapoport if (rdev == node->regulator) { 10740f1d747bSMike Rapoport list_del(&node->list); 107540f9244fSMark Brown kfree(node->dev_name); 10760f1d747bSMike Rapoport kfree(node); 10770f1d747bSMike Rapoport } 10780f1d747bSMike Rapoport } 10790f1d747bSMike Rapoport } 10800f1d747bSMike Rapoport 1081f5726ae3SMark Brown #define REG_STR_SIZE 64 1082414c70cbSLiam Girdwood 1083414c70cbSLiam Girdwood static struct regulator *create_regulator(struct regulator_dev *rdev, 1084414c70cbSLiam Girdwood struct device *dev, 1085414c70cbSLiam Girdwood const char *supply_name) 1086414c70cbSLiam Girdwood { 1087414c70cbSLiam Girdwood struct regulator *regulator; 1088414c70cbSLiam Girdwood char buf[REG_STR_SIZE]; 1089414c70cbSLiam Girdwood int err, size; 1090414c70cbSLiam Girdwood 1091414c70cbSLiam Girdwood regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1092414c70cbSLiam Girdwood if (regulator == NULL) 1093414c70cbSLiam Girdwood return NULL; 1094414c70cbSLiam Girdwood 1095414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1096414c70cbSLiam Girdwood regulator->rdev = rdev; 1097414c70cbSLiam Girdwood list_add(®ulator->list, &rdev->consumer_list); 1098414c70cbSLiam Girdwood 1099414c70cbSLiam Girdwood if (dev) { 1100414c70cbSLiam Girdwood /* create a 'requested_microamps_name' sysfs entry */ 1101e0eaedefSMark Brown size = scnprintf(buf, REG_STR_SIZE, 1102e0eaedefSMark Brown "microamps_requested_%s-%s", 1103e0eaedefSMark Brown dev_name(dev), supply_name); 1104414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1105414c70cbSLiam Girdwood goto overflow_err; 1106414c70cbSLiam Girdwood 1107414c70cbSLiam Girdwood regulator->dev = dev; 11084f26a2abSAmeya Palande sysfs_attr_init(®ulator->dev_attr.attr); 1109414c70cbSLiam Girdwood regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1110414c70cbSLiam Girdwood if (regulator->dev_attr.attr.name == NULL) 1111414c70cbSLiam Girdwood goto attr_name_err; 1112414c70cbSLiam Girdwood 1113414c70cbSLiam Girdwood regulator->dev_attr.attr.mode = 0444; 1114414c70cbSLiam Girdwood regulator->dev_attr.show = device_requested_uA_show; 1115414c70cbSLiam Girdwood err = device_create_file(dev, ®ulator->dev_attr); 1116414c70cbSLiam Girdwood if (err < 0) { 11175da84fd9SJoe Perches rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1118414c70cbSLiam Girdwood goto attr_name_err; 1119414c70cbSLiam Girdwood } 1120414c70cbSLiam Girdwood 1121414c70cbSLiam Girdwood /* also add a link to the device sysfs entry */ 1122414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1123414c70cbSLiam Girdwood dev->kobj.name, supply_name); 1124414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1125414c70cbSLiam Girdwood goto attr_err; 1126414c70cbSLiam Girdwood 1127414c70cbSLiam Girdwood regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1128414c70cbSLiam Girdwood if (regulator->supply_name == NULL) 1129414c70cbSLiam Girdwood goto attr_err; 1130414c70cbSLiam Girdwood 1131414c70cbSLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1132414c70cbSLiam Girdwood buf); 1133414c70cbSLiam Girdwood if (err) { 11345da84fd9SJoe Perches rdev_warn(rdev, "could not add device link %s err %d\n", 11351d7372e1SDaniel Walker dev->kobj.name, err); 1136414c70cbSLiam Girdwood goto link_name_err; 1137414c70cbSLiam Girdwood } 11385de70519SMark Brown } else { 11395de70519SMark Brown regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 11405de70519SMark Brown if (regulator->supply_name == NULL) 11415de70519SMark Brown goto attr_err; 1142414c70cbSLiam Girdwood } 11435de70519SMark Brown 11445de70519SMark Brown regulator->debugfs = debugfs_create_dir(regulator->supply_name, 11455de70519SMark Brown rdev->debugfs); 114624751434SStephen Boyd if (!regulator->debugfs) { 11475de70519SMark Brown rdev_warn(rdev, "Failed to create debugfs directory\n"); 11485de70519SMark Brown } else { 11495de70519SMark Brown debugfs_create_u32("uA_load", 0444, regulator->debugfs, 11505de70519SMark Brown ®ulator->uA_load); 11515de70519SMark Brown debugfs_create_u32("min_uV", 0444, regulator->debugfs, 11525de70519SMark Brown ®ulator->min_uV); 11535de70519SMark Brown debugfs_create_u32("max_uV", 0444, regulator->debugfs, 11545de70519SMark Brown ®ulator->max_uV); 11555de70519SMark Brown } 11565de70519SMark Brown 1157414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1158414c70cbSLiam Girdwood return regulator; 1159414c70cbSLiam Girdwood link_name_err: 1160414c70cbSLiam Girdwood kfree(regulator->supply_name); 1161414c70cbSLiam Girdwood attr_err: 1162414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1163414c70cbSLiam Girdwood attr_name_err: 1164414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1165414c70cbSLiam Girdwood overflow_err: 1166414c70cbSLiam Girdwood list_del(®ulator->list); 1167414c70cbSLiam Girdwood kfree(regulator); 1168414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1169414c70cbSLiam Girdwood return NULL; 1170414c70cbSLiam Girdwood } 1171414c70cbSLiam Girdwood 117231aae2beSMark Brown static int _regulator_get_enable_time(struct regulator_dev *rdev) 117331aae2beSMark Brown { 117431aae2beSMark Brown if (!rdev->desc->ops->enable_time) 117531aae2beSMark Brown return 0; 117631aae2beSMark Brown return rdev->desc->ops->enable_time(rdev); 117731aae2beSMark Brown } 117831aae2beSMark Brown 117969511a45SRajendra Nayak static struct regulator_dev *regulator_dev_lookup(struct device *dev, 118069511a45SRajendra Nayak const char *supply) 118169511a45SRajendra Nayak { 118269511a45SRajendra Nayak struct regulator_dev *r; 118369511a45SRajendra Nayak struct device_node *node; 118469511a45SRajendra Nayak 118569511a45SRajendra Nayak /* first do a dt based lookup */ 118669511a45SRajendra Nayak if (dev && dev->of_node) { 118769511a45SRajendra Nayak node = of_get_regulator(dev, supply); 118869511a45SRajendra Nayak if (node) 118969511a45SRajendra Nayak list_for_each_entry(r, ®ulator_list, list) 119069511a45SRajendra Nayak if (r->dev.parent && 119169511a45SRajendra Nayak node == r->dev.of_node) 119269511a45SRajendra Nayak return r; 119369511a45SRajendra Nayak } 119469511a45SRajendra Nayak 119569511a45SRajendra Nayak /* if not found, try doing it non-dt way */ 119669511a45SRajendra Nayak list_for_each_entry(r, ®ulator_list, list) 119769511a45SRajendra Nayak if (strcmp(rdev_get_name(r), supply) == 0) 119869511a45SRajendra Nayak return r; 119969511a45SRajendra Nayak 120069511a45SRajendra Nayak return NULL; 120169511a45SRajendra Nayak } 120269511a45SRajendra Nayak 12035ffbd136SMark Brown /* Internal regulator request function */ 12045ffbd136SMark Brown static struct regulator *_regulator_get(struct device *dev, const char *id, 12055ffbd136SMark Brown int exclusive) 1206414c70cbSLiam Girdwood { 1207414c70cbSLiam Girdwood struct regulator_dev *rdev; 1208414c70cbSLiam Girdwood struct regulator_map *map; 1209414c70cbSLiam Girdwood struct regulator *regulator = ERR_PTR(-ENODEV); 121040f9244fSMark Brown const char *devname = NULL; 12115ffbd136SMark Brown int ret; 1212414c70cbSLiam Girdwood 1213414c70cbSLiam Girdwood if (id == NULL) { 12145da84fd9SJoe Perches pr_err("get() with no identifier\n"); 1215414c70cbSLiam Girdwood return regulator; 1216414c70cbSLiam Girdwood } 1217414c70cbSLiam Girdwood 121840f9244fSMark Brown if (dev) 121940f9244fSMark Brown devname = dev_name(dev); 122040f9244fSMark Brown 1221414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1222414c70cbSLiam Girdwood 122369511a45SRajendra Nayak rdev = regulator_dev_lookup(dev, id); 122469511a45SRajendra Nayak if (rdev) 122569511a45SRajendra Nayak goto found; 122669511a45SRajendra Nayak 1227414c70cbSLiam Girdwood list_for_each_entry(map, ®ulator_map_list, list) { 122840f9244fSMark Brown /* If the mapping has a device set up it must match */ 122940f9244fSMark Brown if (map->dev_name && 123040f9244fSMark Brown (!devname || strcmp(map->dev_name, devname))) 123140f9244fSMark Brown continue; 123240f9244fSMark Brown 123340f9244fSMark Brown if (strcmp(map->supply, id) == 0) { 1234a5766f11SLiam Girdwood rdev = map->regulator; 1235414c70cbSLiam Girdwood goto found; 1236414c70cbSLiam Girdwood } 1237a5766f11SLiam Girdwood } 123834abbd68SMark Brown 1239688fe99aSMark Brown if (board_wants_dummy_regulator) { 1240688fe99aSMark Brown rdev = dummy_regulator_rdev; 1241688fe99aSMark Brown goto found; 1242688fe99aSMark Brown } 1243688fe99aSMark Brown 124434abbd68SMark Brown #ifdef CONFIG_REGULATOR_DUMMY 124534abbd68SMark Brown if (!devname) 124634abbd68SMark Brown devname = "deviceless"; 124734abbd68SMark Brown 124834abbd68SMark Brown /* If the board didn't flag that it was fully constrained then 124934abbd68SMark Brown * substitute in a dummy regulator so consumers can continue. 125034abbd68SMark Brown */ 125134abbd68SMark Brown if (!has_full_constraints) { 12525da84fd9SJoe Perches pr_warn("%s supply %s not found, using dummy regulator\n", 125334abbd68SMark Brown devname, id); 125434abbd68SMark Brown rdev = dummy_regulator_rdev; 125534abbd68SMark Brown goto found; 125634abbd68SMark Brown } 125734abbd68SMark Brown #endif 125834abbd68SMark Brown 1259414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1260414c70cbSLiam Girdwood return regulator; 1261414c70cbSLiam Girdwood 1262414c70cbSLiam Girdwood found: 12635ffbd136SMark Brown if (rdev->exclusive) { 12645ffbd136SMark Brown regulator = ERR_PTR(-EPERM); 12655ffbd136SMark Brown goto out; 12665ffbd136SMark Brown } 12675ffbd136SMark Brown 12685ffbd136SMark Brown if (exclusive && rdev->open_count) { 12695ffbd136SMark Brown regulator = ERR_PTR(-EBUSY); 12705ffbd136SMark Brown goto out; 12715ffbd136SMark Brown } 12725ffbd136SMark Brown 1273a5766f11SLiam Girdwood if (!try_module_get(rdev->owner)) 1274a5766f11SLiam Girdwood goto out; 1275a5766f11SLiam Girdwood 1276414c70cbSLiam Girdwood regulator = create_regulator(rdev, dev, id); 1277414c70cbSLiam Girdwood if (regulator == NULL) { 1278414c70cbSLiam Girdwood regulator = ERR_PTR(-ENOMEM); 1279414c70cbSLiam Girdwood module_put(rdev->owner); 1280bcda4321SAxel Lin goto out; 1281414c70cbSLiam Girdwood } 1282414c70cbSLiam Girdwood 12835ffbd136SMark Brown rdev->open_count++; 12845ffbd136SMark Brown if (exclusive) { 12855ffbd136SMark Brown rdev->exclusive = 1; 12865ffbd136SMark Brown 12875ffbd136SMark Brown ret = _regulator_is_enabled(rdev); 12885ffbd136SMark Brown if (ret > 0) 12895ffbd136SMark Brown rdev->use_count = 1; 12905ffbd136SMark Brown else 12915ffbd136SMark Brown rdev->use_count = 0; 12925ffbd136SMark Brown } 12935ffbd136SMark Brown 1294a5766f11SLiam Girdwood out: 1295414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 12965ffbd136SMark Brown 1297414c70cbSLiam Girdwood return regulator; 1298414c70cbSLiam Girdwood } 12995ffbd136SMark Brown 13005ffbd136SMark Brown /** 13015ffbd136SMark Brown * regulator_get - lookup and obtain a reference to a regulator. 13025ffbd136SMark Brown * @dev: device for regulator "consumer" 13035ffbd136SMark Brown * @id: Supply name or regulator ID. 13045ffbd136SMark Brown * 13055ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 13065ffbd136SMark Brown * or IS_ERR() condition containing errno. 13075ffbd136SMark Brown * 13085ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 13095ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 13105ffbd136SMark Brown * should match the name used for the supply and/or the relevant 13115ffbd136SMark Brown * device pins in the datasheet. 13125ffbd136SMark Brown */ 13135ffbd136SMark Brown struct regulator *regulator_get(struct device *dev, const char *id) 13145ffbd136SMark Brown { 13155ffbd136SMark Brown return _regulator_get(dev, id, 0); 13165ffbd136SMark Brown } 1317414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get); 1318414c70cbSLiam Girdwood 1319414c70cbSLiam Girdwood /** 13205ffbd136SMark Brown * regulator_get_exclusive - obtain exclusive access to a regulator. 13215ffbd136SMark Brown * @dev: device for regulator "consumer" 13225ffbd136SMark Brown * @id: Supply name or regulator ID. 13235ffbd136SMark Brown * 13245ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 13255ffbd136SMark Brown * or IS_ERR() condition containing errno. Other consumers will be 13265ffbd136SMark Brown * unable to obtain this reference is held and the use count for the 13275ffbd136SMark Brown * regulator will be initialised to reflect the current state of the 13285ffbd136SMark Brown * regulator. 13295ffbd136SMark Brown * 13305ffbd136SMark Brown * This is intended for use by consumers which cannot tolerate shared 13315ffbd136SMark Brown * use of the regulator such as those which need to force the 13325ffbd136SMark Brown * regulator off for correct operation of the hardware they are 13335ffbd136SMark Brown * controlling. 13345ffbd136SMark Brown * 13355ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 13365ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 13375ffbd136SMark Brown * should match the name used for the supply and/or the relevant 13385ffbd136SMark Brown * device pins in the datasheet. 13395ffbd136SMark Brown */ 13405ffbd136SMark Brown struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 13415ffbd136SMark Brown { 13425ffbd136SMark Brown return _regulator_get(dev, id, 1); 13435ffbd136SMark Brown } 13445ffbd136SMark Brown EXPORT_SYMBOL_GPL(regulator_get_exclusive); 13455ffbd136SMark Brown 13465ffbd136SMark Brown /** 1347414c70cbSLiam Girdwood * regulator_put - "free" the regulator source 1348414c70cbSLiam Girdwood * @regulator: regulator source 1349414c70cbSLiam Girdwood * 1350414c70cbSLiam Girdwood * Note: drivers must ensure that all regulator_enable calls made on this 1351414c70cbSLiam Girdwood * regulator source are balanced by regulator_disable calls prior to calling 1352414c70cbSLiam Girdwood * this function. 1353414c70cbSLiam Girdwood */ 1354414c70cbSLiam Girdwood void regulator_put(struct regulator *regulator) 1355414c70cbSLiam Girdwood { 1356414c70cbSLiam Girdwood struct regulator_dev *rdev; 1357414c70cbSLiam Girdwood 1358414c70cbSLiam Girdwood if (regulator == NULL || IS_ERR(regulator)) 1359414c70cbSLiam Girdwood return; 1360414c70cbSLiam Girdwood 1361414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1362414c70cbSLiam Girdwood rdev = regulator->rdev; 1363414c70cbSLiam Girdwood 13645de70519SMark Brown debugfs_remove_recursive(regulator->debugfs); 13655de70519SMark Brown 1366414c70cbSLiam Girdwood /* remove any sysfs entries */ 1367414c70cbSLiam Girdwood if (regulator->dev) { 1368414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1369414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1370414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1371414c70cbSLiam Girdwood } 13725de70519SMark Brown kfree(regulator->supply_name); 1373414c70cbSLiam Girdwood list_del(®ulator->list); 1374414c70cbSLiam Girdwood kfree(regulator); 1375414c70cbSLiam Girdwood 13765ffbd136SMark Brown rdev->open_count--; 13775ffbd136SMark Brown rdev->exclusive = 0; 13785ffbd136SMark Brown 1379414c70cbSLiam Girdwood module_put(rdev->owner); 1380414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1381414c70cbSLiam Girdwood } 1382414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_put); 1383414c70cbSLiam Girdwood 13849a2372faSMark Brown static int _regulator_can_change_status(struct regulator_dev *rdev) 13859a2372faSMark Brown { 13869a2372faSMark Brown if (!rdev->constraints) 13879a2372faSMark Brown return 0; 13889a2372faSMark Brown 13899a2372faSMark Brown if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 13909a2372faSMark Brown return 1; 13919a2372faSMark Brown else 13929a2372faSMark Brown return 0; 13939a2372faSMark Brown } 13949a2372faSMark Brown 1395414c70cbSLiam Girdwood /* locks held by regulator_enable() */ 1396414c70cbSLiam Girdwood static int _regulator_enable(struct regulator_dev *rdev) 1397414c70cbSLiam Girdwood { 139831aae2beSMark Brown int ret, delay; 1399414c70cbSLiam Girdwood 1400414c70cbSLiam Girdwood /* check voltage and requested load before enabling */ 1401414c70cbSLiam Girdwood if (rdev->constraints && 14029a2372faSMark Brown (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1403414c70cbSLiam Girdwood drms_uA_update(rdev); 1404414c70cbSLiam Girdwood 14059a2372faSMark Brown if (rdev->use_count == 0) { 14069a2372faSMark Brown /* The regulator may on if it's not switchable or left on */ 14079a2372faSMark Brown ret = _regulator_is_enabled(rdev); 14089a2372faSMark Brown if (ret == -EINVAL || ret == 0) { 14099a2372faSMark Brown if (!_regulator_can_change_status(rdev)) 14109a2372faSMark Brown return -EPERM; 14119a2372faSMark Brown 141231aae2beSMark Brown if (!rdev->desc->ops->enable) 141331aae2beSMark Brown return -EINVAL; 141431aae2beSMark Brown 141531aae2beSMark Brown /* Query before enabling in case configuration 141625985edcSLucas De Marchi * dependent. */ 141731aae2beSMark Brown ret = _regulator_get_enable_time(rdev); 141831aae2beSMark Brown if (ret >= 0) { 141931aae2beSMark Brown delay = ret; 142031aae2beSMark Brown } else { 14215da84fd9SJoe Perches rdev_warn(rdev, "enable_time() failed: %d\n", 142231aae2beSMark Brown ret); 142331aae2beSMark Brown delay = 0; 142431aae2beSMark Brown } 142531aae2beSMark Brown 142602fa3ec0SMark Brown trace_regulator_enable(rdev_get_name(rdev)); 142702fa3ec0SMark Brown 142831aae2beSMark Brown /* Allow the regulator to ramp; it would be useful 142931aae2beSMark Brown * to extend this for bulk operations so that the 143031aae2beSMark Brown * regulators can ramp together. */ 1431414c70cbSLiam Girdwood ret = rdev->desc->ops->enable(rdev); 14329a2372faSMark Brown if (ret < 0) 14339a2372faSMark Brown return ret; 143431aae2beSMark Brown 143502fa3ec0SMark Brown trace_regulator_enable_delay(rdev_get_name(rdev)); 143602fa3ec0SMark Brown 1437e36c1df8SAxel Lin if (delay >= 1000) { 143831aae2beSMark Brown mdelay(delay / 1000); 1439e36c1df8SAxel Lin udelay(delay % 1000); 1440e36c1df8SAxel Lin } else if (delay) { 144131aae2beSMark Brown udelay(delay); 1442e36c1df8SAxel Lin } 144331aae2beSMark Brown 144402fa3ec0SMark Brown trace_regulator_enable_complete(rdev_get_name(rdev)); 144502fa3ec0SMark Brown 1446a7433cffSLinus Walleij } else if (ret < 0) { 14475da84fd9SJoe Perches rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1448414c70cbSLiam Girdwood return ret; 1449414c70cbSLiam Girdwood } 1450a7433cffSLinus Walleij /* Fallthrough on positive return values - already enabled */ 1451414c70cbSLiam Girdwood } 1452414c70cbSLiam Girdwood 14539a2372faSMark Brown rdev->use_count++; 14549a2372faSMark Brown 14559a2372faSMark Brown return 0; 1456414c70cbSLiam Girdwood } 1457414c70cbSLiam Girdwood 1458414c70cbSLiam Girdwood /** 1459414c70cbSLiam Girdwood * regulator_enable - enable regulator output 1460414c70cbSLiam Girdwood * @regulator: regulator source 1461414c70cbSLiam Girdwood * 1462cf7bbcdfSMark Brown * Request that the regulator be enabled with the regulator output at 1463cf7bbcdfSMark Brown * the predefined voltage or current value. Calls to regulator_enable() 1464cf7bbcdfSMark Brown * must be balanced with calls to regulator_disable(). 1465cf7bbcdfSMark Brown * 1466414c70cbSLiam Girdwood * NOTE: the output value can be set by other drivers, boot loader or may be 1467cf7bbcdfSMark Brown * hardwired in the regulator. 1468414c70cbSLiam Girdwood */ 1469414c70cbSLiam Girdwood int regulator_enable(struct regulator *regulator) 1470414c70cbSLiam Girdwood { 1471412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1472412aec61SDavid Brownell int ret = 0; 1473414c70cbSLiam Girdwood 14743801b86aSMark Brown if (rdev->supply) { 14753801b86aSMark Brown ret = regulator_enable(rdev->supply); 14763801b86aSMark Brown if (ret != 0) 14773801b86aSMark Brown return ret; 14783801b86aSMark Brown } 14793801b86aSMark Brown 1480412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1481412aec61SDavid Brownell ret = _regulator_enable(rdev); 1482412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 14833801b86aSMark Brown 1484d1685e4eSHeiko Stübner if (ret != 0 && rdev->supply) 14853801b86aSMark Brown regulator_disable(rdev->supply); 14863801b86aSMark Brown 1487414c70cbSLiam Girdwood return ret; 1488414c70cbSLiam Girdwood } 1489414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_enable); 1490414c70cbSLiam Girdwood 1491414c70cbSLiam Girdwood /* locks held by regulator_disable() */ 14923801b86aSMark Brown static int _regulator_disable(struct regulator_dev *rdev) 1493414c70cbSLiam Girdwood { 1494414c70cbSLiam Girdwood int ret = 0; 1495414c70cbSLiam Girdwood 1496cd94b505SDavid Brownell if (WARN(rdev->use_count <= 0, 149743e7ee33SJoe Perches "unbalanced disables for %s\n", rdev_get_name(rdev))) 1498cd94b505SDavid Brownell return -EIO; 1499cd94b505SDavid Brownell 1500414c70cbSLiam Girdwood /* are we the last user and permitted to disable ? */ 150160ef66fcSMark Brown if (rdev->use_count == 1 && 150260ef66fcSMark Brown (rdev->constraints && !rdev->constraints->always_on)) { 1503414c70cbSLiam Girdwood 1504414c70cbSLiam Girdwood /* we are last user */ 15059a2372faSMark Brown if (_regulator_can_change_status(rdev) && 15069a2372faSMark Brown rdev->desc->ops->disable) { 150702fa3ec0SMark Brown trace_regulator_disable(rdev_get_name(rdev)); 150802fa3ec0SMark Brown 1509414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1510414c70cbSLiam Girdwood if (ret < 0) { 15115da84fd9SJoe Perches rdev_err(rdev, "failed to disable\n"); 1512414c70cbSLiam Girdwood return ret; 1513414c70cbSLiam Girdwood } 151484b68263SMark Brown 151502fa3ec0SMark Brown trace_regulator_disable_complete(rdev_get_name(rdev)); 151602fa3ec0SMark Brown 151784b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 151884b68263SMark Brown NULL); 1519414c70cbSLiam Girdwood } 1520414c70cbSLiam Girdwood 1521414c70cbSLiam Girdwood rdev->use_count = 0; 1522414c70cbSLiam Girdwood } else if (rdev->use_count > 1) { 1523414c70cbSLiam Girdwood 1524414c70cbSLiam Girdwood if (rdev->constraints && 1525414c70cbSLiam Girdwood (rdev->constraints->valid_ops_mask & 1526414c70cbSLiam Girdwood REGULATOR_CHANGE_DRMS)) 1527414c70cbSLiam Girdwood drms_uA_update(rdev); 1528414c70cbSLiam Girdwood 1529414c70cbSLiam Girdwood rdev->use_count--; 1530414c70cbSLiam Girdwood } 15313801b86aSMark Brown 1532414c70cbSLiam Girdwood return ret; 1533414c70cbSLiam Girdwood } 1534414c70cbSLiam Girdwood 1535414c70cbSLiam Girdwood /** 1536414c70cbSLiam Girdwood * regulator_disable - disable regulator output 1537414c70cbSLiam Girdwood * @regulator: regulator source 1538414c70cbSLiam Girdwood * 1539cf7bbcdfSMark Brown * Disable the regulator output voltage or current. Calls to 1540cf7bbcdfSMark Brown * regulator_enable() must be balanced with calls to 1541cf7bbcdfSMark Brown * regulator_disable(). 154269279fb9SMark Brown * 1543414c70cbSLiam Girdwood * NOTE: this will only disable the regulator output if no other consumer 1544cf7bbcdfSMark Brown * devices have it enabled, the regulator device supports disabling and 1545cf7bbcdfSMark Brown * machine constraints permit this operation. 1546414c70cbSLiam Girdwood */ 1547414c70cbSLiam Girdwood int regulator_disable(struct regulator *regulator) 1548414c70cbSLiam Girdwood { 1549412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1550412aec61SDavid Brownell int ret = 0; 1551414c70cbSLiam Girdwood 1552412aec61SDavid Brownell mutex_lock(&rdev->mutex); 15533801b86aSMark Brown ret = _regulator_disable(rdev); 1554412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 15558cbf811dSJeffrey Carlyle 15563801b86aSMark Brown if (ret == 0 && rdev->supply) 15573801b86aSMark Brown regulator_disable(rdev->supply); 15588cbf811dSJeffrey Carlyle 1559414c70cbSLiam Girdwood return ret; 1560414c70cbSLiam Girdwood } 1561414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_disable); 1562414c70cbSLiam Girdwood 1563414c70cbSLiam Girdwood /* locks held by regulator_force_disable() */ 15643801b86aSMark Brown static int _regulator_force_disable(struct regulator_dev *rdev) 1565414c70cbSLiam Girdwood { 1566414c70cbSLiam Girdwood int ret = 0; 1567414c70cbSLiam Girdwood 1568414c70cbSLiam Girdwood /* force disable */ 1569414c70cbSLiam Girdwood if (rdev->desc->ops->disable) { 1570414c70cbSLiam Girdwood /* ah well, who wants to live forever... */ 1571414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1572414c70cbSLiam Girdwood if (ret < 0) { 15735da84fd9SJoe Perches rdev_err(rdev, "failed to force disable\n"); 1574414c70cbSLiam Girdwood return ret; 1575414c70cbSLiam Girdwood } 1576414c70cbSLiam Girdwood /* notify other consumers that power has been forced off */ 157784b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 157884b68263SMark Brown REGULATOR_EVENT_DISABLE, NULL); 1579414c70cbSLiam Girdwood } 1580414c70cbSLiam Girdwood 1581414c70cbSLiam Girdwood return ret; 1582414c70cbSLiam Girdwood } 1583414c70cbSLiam Girdwood 1584414c70cbSLiam Girdwood /** 1585414c70cbSLiam Girdwood * regulator_force_disable - force disable regulator output 1586414c70cbSLiam Girdwood * @regulator: regulator source 1587414c70cbSLiam Girdwood * 1588414c70cbSLiam Girdwood * Forcibly disable the regulator output voltage or current. 1589414c70cbSLiam Girdwood * NOTE: this *will* disable the regulator output even if other consumer 1590414c70cbSLiam Girdwood * devices have it enabled. This should be used for situations when device 1591414c70cbSLiam Girdwood * damage will likely occur if the regulator is not disabled (e.g. over temp). 1592414c70cbSLiam Girdwood */ 1593414c70cbSLiam Girdwood int regulator_force_disable(struct regulator *regulator) 1594414c70cbSLiam Girdwood { 159582d15839SMark Brown struct regulator_dev *rdev = regulator->rdev; 1596414c70cbSLiam Girdwood int ret; 1597414c70cbSLiam Girdwood 159882d15839SMark Brown mutex_lock(&rdev->mutex); 1599414c70cbSLiam Girdwood regulator->uA_load = 0; 16003801b86aSMark Brown ret = _regulator_force_disable(regulator->rdev); 160182d15839SMark Brown mutex_unlock(&rdev->mutex); 16028cbf811dSJeffrey Carlyle 16033801b86aSMark Brown if (rdev->supply) 16043801b86aSMark Brown while (rdev->open_count--) 16053801b86aSMark Brown regulator_disable(rdev->supply); 16068cbf811dSJeffrey Carlyle 1607414c70cbSLiam Girdwood return ret; 1608414c70cbSLiam Girdwood } 1609414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_force_disable); 1610414c70cbSLiam Girdwood 1611da07ecd9SMark Brown static void regulator_disable_work(struct work_struct *work) 1612da07ecd9SMark Brown { 1613da07ecd9SMark Brown struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1614da07ecd9SMark Brown disable_work.work); 1615da07ecd9SMark Brown int count, i, ret; 1616da07ecd9SMark Brown 1617da07ecd9SMark Brown mutex_lock(&rdev->mutex); 1618da07ecd9SMark Brown 1619da07ecd9SMark Brown BUG_ON(!rdev->deferred_disables); 1620da07ecd9SMark Brown 1621da07ecd9SMark Brown count = rdev->deferred_disables; 1622da07ecd9SMark Brown rdev->deferred_disables = 0; 1623da07ecd9SMark Brown 1624da07ecd9SMark Brown for (i = 0; i < count; i++) { 1625da07ecd9SMark Brown ret = _regulator_disable(rdev); 1626da07ecd9SMark Brown if (ret != 0) 1627da07ecd9SMark Brown rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1628da07ecd9SMark Brown } 1629da07ecd9SMark Brown 1630da07ecd9SMark Brown mutex_unlock(&rdev->mutex); 1631da07ecd9SMark Brown 1632da07ecd9SMark Brown if (rdev->supply) { 1633da07ecd9SMark Brown for (i = 0; i < count; i++) { 1634da07ecd9SMark Brown ret = regulator_disable(rdev->supply); 1635da07ecd9SMark Brown if (ret != 0) { 1636da07ecd9SMark Brown rdev_err(rdev, 1637da07ecd9SMark Brown "Supply disable failed: %d\n", ret); 1638da07ecd9SMark Brown } 1639da07ecd9SMark Brown } 1640da07ecd9SMark Brown } 1641da07ecd9SMark Brown } 1642da07ecd9SMark Brown 1643da07ecd9SMark Brown /** 1644da07ecd9SMark Brown * regulator_disable_deferred - disable regulator output with delay 1645da07ecd9SMark Brown * @regulator: regulator source 1646da07ecd9SMark Brown * @ms: miliseconds until the regulator is disabled 1647da07ecd9SMark Brown * 1648da07ecd9SMark Brown * Execute regulator_disable() on the regulator after a delay. This 1649da07ecd9SMark Brown * is intended for use with devices that require some time to quiesce. 1650da07ecd9SMark Brown * 1651da07ecd9SMark Brown * NOTE: this will only disable the regulator output if no other consumer 1652da07ecd9SMark Brown * devices have it enabled, the regulator device supports disabling and 1653da07ecd9SMark Brown * machine constraints permit this operation. 1654da07ecd9SMark Brown */ 1655da07ecd9SMark Brown int regulator_disable_deferred(struct regulator *regulator, int ms) 1656da07ecd9SMark Brown { 1657da07ecd9SMark Brown struct regulator_dev *rdev = regulator->rdev; 1658aa59802dSMark Brown int ret; 1659da07ecd9SMark Brown 1660da07ecd9SMark Brown mutex_lock(&rdev->mutex); 1661da07ecd9SMark Brown rdev->deferred_disables++; 1662da07ecd9SMark Brown mutex_unlock(&rdev->mutex); 1663da07ecd9SMark Brown 1664aa59802dSMark Brown ret = schedule_delayed_work(&rdev->disable_work, 1665da07ecd9SMark Brown msecs_to_jiffies(ms)); 1666aa59802dSMark Brown if (ret < 0) 1667aa59802dSMark Brown return ret; 1668aa59802dSMark Brown else 1669aa59802dSMark Brown return 0; 1670da07ecd9SMark Brown } 1671da07ecd9SMark Brown EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1672da07ecd9SMark Brown 1673414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev) 1674414c70cbSLiam Girdwood { 16759a7f6a4cSMark Brown /* If we don't know then assume that the regulator is always on */ 16769332546fSMark Brown if (!rdev->desc->ops->is_enabled) 16779a7f6a4cSMark Brown return 1; 1678414c70cbSLiam Girdwood 16799332546fSMark Brown return rdev->desc->ops->is_enabled(rdev); 1680414c70cbSLiam Girdwood } 1681414c70cbSLiam Girdwood 1682414c70cbSLiam Girdwood /** 1683414c70cbSLiam Girdwood * regulator_is_enabled - is the regulator output enabled 1684414c70cbSLiam Girdwood * @regulator: regulator source 1685414c70cbSLiam Girdwood * 1686412aec61SDavid Brownell * Returns positive if the regulator driver backing the source/client 1687412aec61SDavid Brownell * has requested that the device be enabled, zero if it hasn't, else a 1688412aec61SDavid Brownell * negative errno code. 1689412aec61SDavid Brownell * 1690412aec61SDavid Brownell * Note that the device backing this regulator handle can have multiple 1691412aec61SDavid Brownell * users, so it might be enabled even if regulator_enable() was never 1692412aec61SDavid Brownell * called for this particular source. 1693414c70cbSLiam Girdwood */ 1694414c70cbSLiam Girdwood int regulator_is_enabled(struct regulator *regulator) 1695414c70cbSLiam Girdwood { 16969332546fSMark Brown int ret; 16979332546fSMark Brown 16989332546fSMark Brown mutex_lock(®ulator->rdev->mutex); 16999332546fSMark Brown ret = _regulator_is_enabled(regulator->rdev); 17009332546fSMark Brown mutex_unlock(®ulator->rdev->mutex); 17019332546fSMark Brown 17029332546fSMark Brown return ret; 1703414c70cbSLiam Girdwood } 1704414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_is_enabled); 1705414c70cbSLiam Girdwood 1706414c70cbSLiam Girdwood /** 17074367cfdcSDavid Brownell * regulator_count_voltages - count regulator_list_voltage() selectors 17084367cfdcSDavid Brownell * @regulator: regulator source 17094367cfdcSDavid Brownell * 17104367cfdcSDavid Brownell * Returns number of selectors, or negative errno. Selectors are 17114367cfdcSDavid Brownell * numbered starting at zero, and typically correspond to bitfields 17124367cfdcSDavid Brownell * in hardware registers. 17134367cfdcSDavid Brownell */ 17144367cfdcSDavid Brownell int regulator_count_voltages(struct regulator *regulator) 17154367cfdcSDavid Brownell { 17164367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 17174367cfdcSDavid Brownell 17184367cfdcSDavid Brownell return rdev->desc->n_voltages ? : -EINVAL; 17194367cfdcSDavid Brownell } 17204367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_count_voltages); 17214367cfdcSDavid Brownell 17224367cfdcSDavid Brownell /** 17234367cfdcSDavid Brownell * regulator_list_voltage - enumerate supported voltages 17244367cfdcSDavid Brownell * @regulator: regulator source 17254367cfdcSDavid Brownell * @selector: identify voltage to list 17264367cfdcSDavid Brownell * Context: can sleep 17274367cfdcSDavid Brownell * 17284367cfdcSDavid Brownell * Returns a voltage that can be passed to @regulator_set_voltage(), 172988393161SThomas Weber * zero if this selector code can't be used on this system, or a 17304367cfdcSDavid Brownell * negative errno. 17314367cfdcSDavid Brownell */ 17324367cfdcSDavid Brownell int regulator_list_voltage(struct regulator *regulator, unsigned selector) 17334367cfdcSDavid Brownell { 17344367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 17354367cfdcSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 17364367cfdcSDavid Brownell int ret; 17374367cfdcSDavid Brownell 17384367cfdcSDavid Brownell if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 17394367cfdcSDavid Brownell return -EINVAL; 17404367cfdcSDavid Brownell 17414367cfdcSDavid Brownell mutex_lock(&rdev->mutex); 17424367cfdcSDavid Brownell ret = ops->list_voltage(rdev, selector); 17434367cfdcSDavid Brownell mutex_unlock(&rdev->mutex); 17444367cfdcSDavid Brownell 17454367cfdcSDavid Brownell if (ret > 0) { 17464367cfdcSDavid Brownell if (ret < rdev->constraints->min_uV) 17474367cfdcSDavid Brownell ret = 0; 17484367cfdcSDavid Brownell else if (ret > rdev->constraints->max_uV) 17494367cfdcSDavid Brownell ret = 0; 17504367cfdcSDavid Brownell } 17514367cfdcSDavid Brownell 17524367cfdcSDavid Brownell return ret; 17534367cfdcSDavid Brownell } 17544367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_list_voltage); 17554367cfdcSDavid Brownell 17564367cfdcSDavid Brownell /** 1757a7a1ad90SMark Brown * regulator_is_supported_voltage - check if a voltage range can be supported 1758a7a1ad90SMark Brown * 1759a7a1ad90SMark Brown * @regulator: Regulator to check. 1760a7a1ad90SMark Brown * @min_uV: Minimum required voltage in uV. 1761a7a1ad90SMark Brown * @max_uV: Maximum required voltage in uV. 1762a7a1ad90SMark Brown * 1763a7a1ad90SMark Brown * Returns a boolean or a negative error code. 1764a7a1ad90SMark Brown */ 1765a7a1ad90SMark Brown int regulator_is_supported_voltage(struct regulator *regulator, 1766a7a1ad90SMark Brown int min_uV, int max_uV) 1767a7a1ad90SMark Brown { 1768a7a1ad90SMark Brown int i, voltages, ret; 1769a7a1ad90SMark Brown 1770a7a1ad90SMark Brown ret = regulator_count_voltages(regulator); 1771a7a1ad90SMark Brown if (ret < 0) 1772a7a1ad90SMark Brown return ret; 1773a7a1ad90SMark Brown voltages = ret; 1774a7a1ad90SMark Brown 1775a7a1ad90SMark Brown for (i = 0; i < voltages; i++) { 1776a7a1ad90SMark Brown ret = regulator_list_voltage(regulator, i); 1777a7a1ad90SMark Brown 1778a7a1ad90SMark Brown if (ret >= min_uV && ret <= max_uV) 1779a7a1ad90SMark Brown return 1; 1780a7a1ad90SMark Brown } 1781a7a1ad90SMark Brown 1782a7a1ad90SMark Brown return 0; 1783a7a1ad90SMark Brown } 1784a398eaa2SMark Brown EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1785a7a1ad90SMark Brown 178675790251SMark Brown static int _regulator_do_set_voltage(struct regulator_dev *rdev, 178775790251SMark Brown int min_uV, int max_uV) 178875790251SMark Brown { 178975790251SMark Brown int ret; 179077af1b26SLinus Walleij int delay = 0; 179175790251SMark Brown unsigned int selector; 179275790251SMark Brown 179375790251SMark Brown trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 179475790251SMark Brown 1795bf5892a8SMark Brown min_uV += rdev->constraints->uV_offset; 1796bf5892a8SMark Brown max_uV += rdev->constraints->uV_offset; 1797bf5892a8SMark Brown 179875790251SMark Brown if (rdev->desc->ops->set_voltage) { 179975790251SMark Brown ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 180075790251SMark Brown &selector); 180175790251SMark Brown 180275790251SMark Brown if (rdev->desc->ops->list_voltage) 180375790251SMark Brown selector = rdev->desc->ops->list_voltage(rdev, 180475790251SMark Brown selector); 180575790251SMark Brown else 180675790251SMark Brown selector = -1; 1807e8eef82bSMark Brown } else if (rdev->desc->ops->set_voltage_sel) { 1808e8eef82bSMark Brown int best_val = INT_MAX; 1809e8eef82bSMark Brown int i; 1810e8eef82bSMark Brown 1811e8eef82bSMark Brown selector = 0; 1812e8eef82bSMark Brown 1813e8eef82bSMark Brown /* Find the smallest voltage that falls within the specified 1814e8eef82bSMark Brown * range. 1815e8eef82bSMark Brown */ 1816e8eef82bSMark Brown for (i = 0; i < rdev->desc->n_voltages; i++) { 1817e8eef82bSMark Brown ret = rdev->desc->ops->list_voltage(rdev, i); 1818e8eef82bSMark Brown if (ret < 0) 1819e8eef82bSMark Brown continue; 1820e8eef82bSMark Brown 1821e8eef82bSMark Brown if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1822e8eef82bSMark Brown best_val = ret; 1823e8eef82bSMark Brown selector = i; 1824e8eef82bSMark Brown } 1825e8eef82bSMark Brown } 1826e8eef82bSMark Brown 182777af1b26SLinus Walleij /* 182877af1b26SLinus Walleij * If we can't obtain the old selector there is not enough 182977af1b26SLinus Walleij * info to call set_voltage_time_sel(). 183077af1b26SLinus Walleij */ 183177af1b26SLinus Walleij if (rdev->desc->ops->set_voltage_time_sel && 183277af1b26SLinus Walleij rdev->desc->ops->get_voltage_sel) { 183377af1b26SLinus Walleij unsigned int old_selector = 0; 183477af1b26SLinus Walleij 183577af1b26SLinus Walleij ret = rdev->desc->ops->get_voltage_sel(rdev); 183677af1b26SLinus Walleij if (ret < 0) 183777af1b26SLinus Walleij return ret; 183877af1b26SLinus Walleij old_selector = ret; 183907351233SAxel Lin ret = rdev->desc->ops->set_voltage_time_sel(rdev, 184077af1b26SLinus Walleij old_selector, selector); 184107351233SAxel Lin if (ret < 0) 184207351233SAxel Lin rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n", ret); 184307351233SAxel Lin else 184407351233SAxel Lin delay = ret; 184577af1b26SLinus Walleij } 184677af1b26SLinus Walleij 1847e8eef82bSMark Brown if (best_val != INT_MAX) { 1848e8eef82bSMark Brown ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1849e8eef82bSMark Brown selector = best_val; 1850e8eef82bSMark Brown } else { 1851e8eef82bSMark Brown ret = -EINVAL; 1852e8eef82bSMark Brown } 185375790251SMark Brown } else { 185475790251SMark Brown ret = -EINVAL; 185575790251SMark Brown } 185675790251SMark Brown 185777af1b26SLinus Walleij /* Insert any necessary delays */ 185877af1b26SLinus Walleij if (delay >= 1000) { 185977af1b26SLinus Walleij mdelay(delay / 1000); 186077af1b26SLinus Walleij udelay(delay % 1000); 186177af1b26SLinus Walleij } else if (delay) { 186277af1b26SLinus Walleij udelay(delay); 186377af1b26SLinus Walleij } 186477af1b26SLinus Walleij 1865ded06a52SMark Brown if (ret == 0) 1866ded06a52SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1867ded06a52SMark Brown NULL); 1868ded06a52SMark Brown 186975790251SMark Brown trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 187075790251SMark Brown 187175790251SMark Brown return ret; 187275790251SMark Brown } 187375790251SMark Brown 1874a7a1ad90SMark Brown /** 1875414c70cbSLiam Girdwood * regulator_set_voltage - set regulator output voltage 1876414c70cbSLiam Girdwood * @regulator: regulator source 1877414c70cbSLiam Girdwood * @min_uV: Minimum required voltage in uV 1878414c70cbSLiam Girdwood * @max_uV: Maximum acceptable voltage in uV 1879414c70cbSLiam Girdwood * 1880414c70cbSLiam Girdwood * Sets a voltage regulator to the desired output voltage. This can be set 1881414c70cbSLiam Girdwood * during any regulator state. IOW, regulator can be disabled or enabled. 1882414c70cbSLiam Girdwood * 1883414c70cbSLiam Girdwood * If the regulator is enabled then the voltage will change to the new value 1884414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1885414c70cbSLiam Girdwood * output at the new voltage when enabled. 1886414c70cbSLiam Girdwood * 1887414c70cbSLiam Girdwood * NOTE: If the regulator is shared between several devices then the lowest 1888414c70cbSLiam Girdwood * request voltage that meets the system constraints will be used. 188969279fb9SMark Brown * Regulator system constraints must be set for this regulator before 1890414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1891414c70cbSLiam Girdwood */ 1892414c70cbSLiam Girdwood int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1893414c70cbSLiam Girdwood { 1894414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 189595a3c23aSMark Brown int ret = 0; 1896414c70cbSLiam Girdwood 1897414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1898414c70cbSLiam Girdwood 189995a3c23aSMark Brown /* If we're setting the same range as last time the change 190095a3c23aSMark Brown * should be a noop (some cpufreq implementations use the same 190195a3c23aSMark Brown * voltage for multiple frequencies, for example). 190295a3c23aSMark Brown */ 190395a3c23aSMark Brown if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 190495a3c23aSMark Brown goto out; 190595a3c23aSMark Brown 1906414c70cbSLiam Girdwood /* sanity check */ 1907e8eef82bSMark Brown if (!rdev->desc->ops->set_voltage && 1908e8eef82bSMark Brown !rdev->desc->ops->set_voltage_sel) { 1909414c70cbSLiam Girdwood ret = -EINVAL; 1910414c70cbSLiam Girdwood goto out; 1911414c70cbSLiam Girdwood } 1912414c70cbSLiam Girdwood 1913414c70cbSLiam Girdwood /* constraints check */ 1914414c70cbSLiam Girdwood ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1915414c70cbSLiam Girdwood if (ret < 0) 1916414c70cbSLiam Girdwood goto out; 1917414c70cbSLiam Girdwood regulator->min_uV = min_uV; 1918414c70cbSLiam Girdwood regulator->max_uV = max_uV; 19193a93f2a9SMark Brown 192005fda3b1SThomas Petazzoni ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 192105fda3b1SThomas Petazzoni if (ret < 0) 192205fda3b1SThomas Petazzoni goto out; 192305fda3b1SThomas Petazzoni 192475790251SMark Brown ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 192502fa3ec0SMark Brown 1926414c70cbSLiam Girdwood out: 1927414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1928414c70cbSLiam Girdwood return ret; 1929414c70cbSLiam Girdwood } 1930414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_voltage); 1931414c70cbSLiam Girdwood 1932606a2562SMark Brown /** 193388cd222bSLinus Walleij * regulator_set_voltage_time - get raise/fall time 193488cd222bSLinus Walleij * @regulator: regulator source 193588cd222bSLinus Walleij * @old_uV: starting voltage in microvolts 193688cd222bSLinus Walleij * @new_uV: target voltage in microvolts 193788cd222bSLinus Walleij * 193888cd222bSLinus Walleij * Provided with the starting and ending voltage, this function attempts to 193988cd222bSLinus Walleij * calculate the time in microseconds required to rise or fall to this new 194088cd222bSLinus Walleij * voltage. 194188cd222bSLinus Walleij */ 194288cd222bSLinus Walleij int regulator_set_voltage_time(struct regulator *regulator, 194388cd222bSLinus Walleij int old_uV, int new_uV) 194488cd222bSLinus Walleij { 194588cd222bSLinus Walleij struct regulator_dev *rdev = regulator->rdev; 194688cd222bSLinus Walleij struct regulator_ops *ops = rdev->desc->ops; 194788cd222bSLinus Walleij int old_sel = -1; 194888cd222bSLinus Walleij int new_sel = -1; 194988cd222bSLinus Walleij int voltage; 195088cd222bSLinus Walleij int i; 195188cd222bSLinus Walleij 195288cd222bSLinus Walleij /* Currently requires operations to do this */ 195388cd222bSLinus Walleij if (!ops->list_voltage || !ops->set_voltage_time_sel 195488cd222bSLinus Walleij || !rdev->desc->n_voltages) 195588cd222bSLinus Walleij return -EINVAL; 195688cd222bSLinus Walleij 195788cd222bSLinus Walleij for (i = 0; i < rdev->desc->n_voltages; i++) { 195888cd222bSLinus Walleij /* We only look for exact voltage matches here */ 195988cd222bSLinus Walleij voltage = regulator_list_voltage(regulator, i); 196088cd222bSLinus Walleij if (voltage < 0) 196188cd222bSLinus Walleij return -EINVAL; 196288cd222bSLinus Walleij if (voltage == 0) 196388cd222bSLinus Walleij continue; 196488cd222bSLinus Walleij if (voltage == old_uV) 196588cd222bSLinus Walleij old_sel = i; 196688cd222bSLinus Walleij if (voltage == new_uV) 196788cd222bSLinus Walleij new_sel = i; 196888cd222bSLinus Walleij } 196988cd222bSLinus Walleij 197088cd222bSLinus Walleij if (old_sel < 0 || new_sel < 0) 197188cd222bSLinus Walleij return -EINVAL; 197288cd222bSLinus Walleij 197388cd222bSLinus Walleij return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 197488cd222bSLinus Walleij } 197588cd222bSLinus Walleij EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 197688cd222bSLinus Walleij 197788cd222bSLinus Walleij /** 1978606a2562SMark Brown * regulator_sync_voltage - re-apply last regulator output voltage 1979606a2562SMark Brown * @regulator: regulator source 1980606a2562SMark Brown * 1981606a2562SMark Brown * Re-apply the last configured voltage. This is intended to be used 1982606a2562SMark Brown * where some external control source the consumer is cooperating with 1983606a2562SMark Brown * has caused the configured voltage to change. 1984606a2562SMark Brown */ 1985606a2562SMark Brown int regulator_sync_voltage(struct regulator *regulator) 1986606a2562SMark Brown { 1987606a2562SMark Brown struct regulator_dev *rdev = regulator->rdev; 1988606a2562SMark Brown int ret, min_uV, max_uV; 1989606a2562SMark Brown 1990606a2562SMark Brown mutex_lock(&rdev->mutex); 1991606a2562SMark Brown 1992606a2562SMark Brown if (!rdev->desc->ops->set_voltage && 1993606a2562SMark Brown !rdev->desc->ops->set_voltage_sel) { 1994606a2562SMark Brown ret = -EINVAL; 1995606a2562SMark Brown goto out; 1996606a2562SMark Brown } 1997606a2562SMark Brown 1998606a2562SMark Brown /* This is only going to work if we've had a voltage configured. */ 1999606a2562SMark Brown if (!regulator->min_uV && !regulator->max_uV) { 2000606a2562SMark Brown ret = -EINVAL; 2001606a2562SMark Brown goto out; 2002606a2562SMark Brown } 2003606a2562SMark Brown 2004606a2562SMark Brown min_uV = regulator->min_uV; 2005606a2562SMark Brown max_uV = regulator->max_uV; 2006606a2562SMark Brown 2007606a2562SMark Brown /* This should be a paranoia check... */ 2008606a2562SMark Brown ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2009606a2562SMark Brown if (ret < 0) 2010606a2562SMark Brown goto out; 2011606a2562SMark Brown 2012606a2562SMark Brown ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2013606a2562SMark Brown if (ret < 0) 2014606a2562SMark Brown goto out; 2015606a2562SMark Brown 2016606a2562SMark Brown ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2017606a2562SMark Brown 2018606a2562SMark Brown out: 2019606a2562SMark Brown mutex_unlock(&rdev->mutex); 2020606a2562SMark Brown return ret; 2021606a2562SMark Brown } 2022606a2562SMark Brown EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2023606a2562SMark Brown 2024414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev) 2025414c70cbSLiam Girdwood { 2026bf5892a8SMark Brown int sel, ret; 2027476c2d83SMark Brown 2028476c2d83SMark Brown if (rdev->desc->ops->get_voltage_sel) { 2029476c2d83SMark Brown sel = rdev->desc->ops->get_voltage_sel(rdev); 2030476c2d83SMark Brown if (sel < 0) 2031476c2d83SMark Brown return sel; 2032bf5892a8SMark Brown ret = rdev->desc->ops->list_voltage(rdev, sel); 2033cb220d16SAxel Lin } else if (rdev->desc->ops->get_voltage) { 2034bf5892a8SMark Brown ret = rdev->desc->ops->get_voltage(rdev); 2035cb220d16SAxel Lin } else { 2036414c70cbSLiam Girdwood return -EINVAL; 2037cb220d16SAxel Lin } 2038bf5892a8SMark Brown 2039cb220d16SAxel Lin if (ret < 0) 2040cb220d16SAxel Lin return ret; 2041bf5892a8SMark Brown return ret - rdev->constraints->uV_offset; 2042414c70cbSLiam Girdwood } 2043414c70cbSLiam Girdwood 2044414c70cbSLiam Girdwood /** 2045414c70cbSLiam Girdwood * regulator_get_voltage - get regulator output voltage 2046414c70cbSLiam Girdwood * @regulator: regulator source 2047414c70cbSLiam Girdwood * 2048414c70cbSLiam Girdwood * This returns the current regulator voltage in uV. 2049414c70cbSLiam Girdwood * 2050414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the voltage value. This 2051414c70cbSLiam Girdwood * function should not be used to determine regulator state. 2052414c70cbSLiam Girdwood */ 2053414c70cbSLiam Girdwood int regulator_get_voltage(struct regulator *regulator) 2054414c70cbSLiam Girdwood { 2055414c70cbSLiam Girdwood int ret; 2056414c70cbSLiam Girdwood 2057414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 2058414c70cbSLiam Girdwood 2059414c70cbSLiam Girdwood ret = _regulator_get_voltage(regulator->rdev); 2060414c70cbSLiam Girdwood 2061414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 2062414c70cbSLiam Girdwood 2063414c70cbSLiam Girdwood return ret; 2064414c70cbSLiam Girdwood } 2065414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_voltage); 2066414c70cbSLiam Girdwood 2067414c70cbSLiam Girdwood /** 2068414c70cbSLiam Girdwood * regulator_set_current_limit - set regulator output current limit 2069414c70cbSLiam Girdwood * @regulator: regulator source 2070414c70cbSLiam Girdwood * @min_uA: Minimuum supported current in uA 2071414c70cbSLiam Girdwood * @max_uA: Maximum supported current in uA 2072414c70cbSLiam Girdwood * 2073414c70cbSLiam Girdwood * Sets current sink to the desired output current. This can be set during 2074414c70cbSLiam Girdwood * any regulator state. IOW, regulator can be disabled or enabled. 2075414c70cbSLiam Girdwood * 2076414c70cbSLiam Girdwood * If the regulator is enabled then the current will change to the new value 2077414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 2078414c70cbSLiam Girdwood * output at the new current when enabled. 2079414c70cbSLiam Girdwood * 2080414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 2081414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 2082414c70cbSLiam Girdwood */ 2083414c70cbSLiam Girdwood int regulator_set_current_limit(struct regulator *regulator, 2084414c70cbSLiam Girdwood int min_uA, int max_uA) 2085414c70cbSLiam Girdwood { 2086414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2087414c70cbSLiam Girdwood int ret; 2088414c70cbSLiam Girdwood 2089414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2090414c70cbSLiam Girdwood 2091414c70cbSLiam Girdwood /* sanity check */ 2092414c70cbSLiam Girdwood if (!rdev->desc->ops->set_current_limit) { 2093414c70cbSLiam Girdwood ret = -EINVAL; 2094414c70cbSLiam Girdwood goto out; 2095414c70cbSLiam Girdwood } 2096414c70cbSLiam Girdwood 2097414c70cbSLiam Girdwood /* constraints check */ 2098414c70cbSLiam Girdwood ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2099414c70cbSLiam Girdwood if (ret < 0) 2100414c70cbSLiam Girdwood goto out; 2101414c70cbSLiam Girdwood 2102414c70cbSLiam Girdwood ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2103414c70cbSLiam Girdwood out: 2104414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2105414c70cbSLiam Girdwood return ret; 2106414c70cbSLiam Girdwood } 2107414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2108414c70cbSLiam Girdwood 2109414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev) 2110414c70cbSLiam Girdwood { 2111414c70cbSLiam Girdwood int ret; 2112414c70cbSLiam Girdwood 2113414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2114414c70cbSLiam Girdwood 2115414c70cbSLiam Girdwood /* sanity check */ 2116414c70cbSLiam Girdwood if (!rdev->desc->ops->get_current_limit) { 2117414c70cbSLiam Girdwood ret = -EINVAL; 2118414c70cbSLiam Girdwood goto out; 2119414c70cbSLiam Girdwood } 2120414c70cbSLiam Girdwood 2121414c70cbSLiam Girdwood ret = rdev->desc->ops->get_current_limit(rdev); 2122414c70cbSLiam Girdwood out: 2123414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2124414c70cbSLiam Girdwood return ret; 2125414c70cbSLiam Girdwood } 2126414c70cbSLiam Girdwood 2127414c70cbSLiam Girdwood /** 2128414c70cbSLiam Girdwood * regulator_get_current_limit - get regulator output current 2129414c70cbSLiam Girdwood * @regulator: regulator source 2130414c70cbSLiam Girdwood * 2131414c70cbSLiam Girdwood * This returns the current supplied by the specified current sink in uA. 2132414c70cbSLiam Girdwood * 2133414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the current value. This 2134414c70cbSLiam Girdwood * function should not be used to determine regulator state. 2135414c70cbSLiam Girdwood */ 2136414c70cbSLiam Girdwood int regulator_get_current_limit(struct regulator *regulator) 2137414c70cbSLiam Girdwood { 2138414c70cbSLiam Girdwood return _regulator_get_current_limit(regulator->rdev); 2139414c70cbSLiam Girdwood } 2140414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2141414c70cbSLiam Girdwood 2142414c70cbSLiam Girdwood /** 2143414c70cbSLiam Girdwood * regulator_set_mode - set regulator operating mode 2144414c70cbSLiam Girdwood * @regulator: regulator source 2145414c70cbSLiam Girdwood * @mode: operating mode - one of the REGULATOR_MODE constants 2146414c70cbSLiam Girdwood * 2147414c70cbSLiam Girdwood * Set regulator operating mode to increase regulator efficiency or improve 2148414c70cbSLiam Girdwood * regulation performance. 2149414c70cbSLiam Girdwood * 2150414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 2151414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 2152414c70cbSLiam Girdwood */ 2153414c70cbSLiam Girdwood int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2154414c70cbSLiam Girdwood { 2155414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2156414c70cbSLiam Girdwood int ret; 2157500b4ac9SSundar R Iyer int regulator_curr_mode; 2158414c70cbSLiam Girdwood 2159414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2160414c70cbSLiam Girdwood 2161414c70cbSLiam Girdwood /* sanity check */ 2162414c70cbSLiam Girdwood if (!rdev->desc->ops->set_mode) { 2163414c70cbSLiam Girdwood ret = -EINVAL; 2164414c70cbSLiam Girdwood goto out; 2165414c70cbSLiam Girdwood } 2166414c70cbSLiam Girdwood 2167500b4ac9SSundar R Iyer /* return if the same mode is requested */ 2168500b4ac9SSundar R Iyer if (rdev->desc->ops->get_mode) { 2169500b4ac9SSundar R Iyer regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2170500b4ac9SSundar R Iyer if (regulator_curr_mode == mode) { 2171500b4ac9SSundar R Iyer ret = 0; 2172500b4ac9SSundar R Iyer goto out; 2173500b4ac9SSundar R Iyer } 2174500b4ac9SSundar R Iyer } 2175500b4ac9SSundar R Iyer 2176414c70cbSLiam Girdwood /* constraints check */ 217722c51b47SAxel Lin ret = regulator_mode_constrain(rdev, &mode); 2178414c70cbSLiam Girdwood if (ret < 0) 2179414c70cbSLiam Girdwood goto out; 2180414c70cbSLiam Girdwood 2181414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 2182414c70cbSLiam Girdwood out: 2183414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2184414c70cbSLiam Girdwood return ret; 2185414c70cbSLiam Girdwood } 2186414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_mode); 2187414c70cbSLiam Girdwood 2188414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2189414c70cbSLiam Girdwood { 2190414c70cbSLiam Girdwood int ret; 2191414c70cbSLiam Girdwood 2192414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2193414c70cbSLiam Girdwood 2194414c70cbSLiam Girdwood /* sanity check */ 2195414c70cbSLiam Girdwood if (!rdev->desc->ops->get_mode) { 2196414c70cbSLiam Girdwood ret = -EINVAL; 2197414c70cbSLiam Girdwood goto out; 2198414c70cbSLiam Girdwood } 2199414c70cbSLiam Girdwood 2200414c70cbSLiam Girdwood ret = rdev->desc->ops->get_mode(rdev); 2201414c70cbSLiam Girdwood out: 2202414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2203414c70cbSLiam Girdwood return ret; 2204414c70cbSLiam Girdwood } 2205414c70cbSLiam Girdwood 2206414c70cbSLiam Girdwood /** 2207414c70cbSLiam Girdwood * regulator_get_mode - get regulator operating mode 2208414c70cbSLiam Girdwood * @regulator: regulator source 2209414c70cbSLiam Girdwood * 2210414c70cbSLiam Girdwood * Get the current regulator operating mode. 2211414c70cbSLiam Girdwood */ 2212414c70cbSLiam Girdwood unsigned int regulator_get_mode(struct regulator *regulator) 2213414c70cbSLiam Girdwood { 2214414c70cbSLiam Girdwood return _regulator_get_mode(regulator->rdev); 2215414c70cbSLiam Girdwood } 2216414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_mode); 2217414c70cbSLiam Girdwood 2218414c70cbSLiam Girdwood /** 2219414c70cbSLiam Girdwood * regulator_set_optimum_mode - set regulator optimum operating mode 2220414c70cbSLiam Girdwood * @regulator: regulator source 2221414c70cbSLiam Girdwood * @uA_load: load current 2222414c70cbSLiam Girdwood * 2223414c70cbSLiam Girdwood * Notifies the regulator core of a new device load. This is then used by 2224414c70cbSLiam Girdwood * DRMS (if enabled by constraints) to set the most efficient regulator 2225414c70cbSLiam Girdwood * operating mode for the new regulator loading. 2226414c70cbSLiam Girdwood * 2227414c70cbSLiam Girdwood * Consumer devices notify their supply regulator of the maximum power 2228414c70cbSLiam Girdwood * they will require (can be taken from device datasheet in the power 2229414c70cbSLiam Girdwood * consumption tables) when they change operational status and hence power 2230414c70cbSLiam Girdwood * state. Examples of operational state changes that can affect power 2231414c70cbSLiam Girdwood * consumption are :- 2232414c70cbSLiam Girdwood * 2233414c70cbSLiam Girdwood * o Device is opened / closed. 2234414c70cbSLiam Girdwood * o Device I/O is about to begin or has just finished. 2235414c70cbSLiam Girdwood * o Device is idling in between work. 2236414c70cbSLiam Girdwood * 2237414c70cbSLiam Girdwood * This information is also exported via sysfs to userspace. 2238414c70cbSLiam Girdwood * 2239414c70cbSLiam Girdwood * DRMS will sum the total requested load on the regulator and change 2240414c70cbSLiam Girdwood * to the most efficient operating mode if platform constraints allow. 2241414c70cbSLiam Girdwood * 2242414c70cbSLiam Girdwood * Returns the new regulator mode or error. 2243414c70cbSLiam Girdwood */ 2244414c70cbSLiam Girdwood int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2245414c70cbSLiam Girdwood { 2246414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2247414c70cbSLiam Girdwood struct regulator *consumer; 2248414c70cbSLiam Girdwood int ret, output_uV, input_uV, total_uA_load = 0; 2249414c70cbSLiam Girdwood unsigned int mode; 2250414c70cbSLiam Girdwood 2251414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2252414c70cbSLiam Girdwood 2253a4b41483SMark Brown /* 2254a4b41483SMark Brown * first check to see if we can set modes at all, otherwise just 2255a4b41483SMark Brown * tell the consumer everything is OK. 2256a4b41483SMark Brown */ 2257414c70cbSLiam Girdwood regulator->uA_load = uA_load; 2258414c70cbSLiam Girdwood ret = regulator_check_drms(rdev); 2259a4b41483SMark Brown if (ret < 0) { 2260a4b41483SMark Brown ret = 0; 2261414c70cbSLiam Girdwood goto out; 2262a4b41483SMark Brown } 2263414c70cbSLiam Girdwood 2264414c70cbSLiam Girdwood if (!rdev->desc->ops->get_optimum_mode) 2265414c70cbSLiam Girdwood goto out; 2266414c70cbSLiam Girdwood 2267a4b41483SMark Brown /* 2268a4b41483SMark Brown * we can actually do this so any errors are indicators of 2269a4b41483SMark Brown * potential real failure. 2270a4b41483SMark Brown */ 2271a4b41483SMark Brown ret = -EINVAL; 2272a4b41483SMark Brown 2273414c70cbSLiam Girdwood /* get output voltage */ 22741bf5a1f8SMark Brown output_uV = _regulator_get_voltage(rdev); 2275414c70cbSLiam Girdwood if (output_uV <= 0) { 22765da84fd9SJoe Perches rdev_err(rdev, "invalid output voltage found\n"); 2277414c70cbSLiam Girdwood goto out; 2278414c70cbSLiam Girdwood } 2279414c70cbSLiam Girdwood 2280414c70cbSLiam Girdwood /* get input voltage */ 22811bf5a1f8SMark Brown input_uV = 0; 22821bf5a1f8SMark Brown if (rdev->supply) 22833801b86aSMark Brown input_uV = regulator_get_voltage(rdev->supply); 22841bf5a1f8SMark Brown if (input_uV <= 0) 2285414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 2286414c70cbSLiam Girdwood if (input_uV <= 0) { 22875da84fd9SJoe Perches rdev_err(rdev, "invalid input voltage found\n"); 2288414c70cbSLiam Girdwood goto out; 2289414c70cbSLiam Girdwood } 2290414c70cbSLiam Girdwood 2291414c70cbSLiam Girdwood /* calc total requested load for this regulator */ 2292414c70cbSLiam Girdwood list_for_each_entry(consumer, &rdev->consumer_list, list) 2293414c70cbSLiam Girdwood total_uA_load += consumer->uA_load; 2294414c70cbSLiam Girdwood 2295414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, 2296414c70cbSLiam Girdwood input_uV, output_uV, 2297414c70cbSLiam Girdwood total_uA_load); 22982c608234SMark Brown ret = regulator_mode_constrain(rdev, &mode); 2299e573520bSDavid Brownell if (ret < 0) { 23005da84fd9SJoe Perches rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2301414c70cbSLiam Girdwood total_uA_load, input_uV, output_uV); 2302414c70cbSLiam Girdwood goto out; 2303414c70cbSLiam Girdwood } 2304414c70cbSLiam Girdwood 2305414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 2306e573520bSDavid Brownell if (ret < 0) { 23075da84fd9SJoe Perches rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2308414c70cbSLiam Girdwood goto out; 2309414c70cbSLiam Girdwood } 2310414c70cbSLiam Girdwood ret = mode; 2311414c70cbSLiam Girdwood out: 2312414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2313414c70cbSLiam Girdwood return ret; 2314414c70cbSLiam Girdwood } 2315414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2316414c70cbSLiam Girdwood 2317414c70cbSLiam Girdwood /** 2318414c70cbSLiam Girdwood * regulator_register_notifier - register regulator event notifier 2319414c70cbSLiam Girdwood * @regulator: regulator source 232069279fb9SMark Brown * @nb: notifier block 2321414c70cbSLiam Girdwood * 2322414c70cbSLiam Girdwood * Register notifier block to receive regulator events. 2323414c70cbSLiam Girdwood */ 2324414c70cbSLiam Girdwood int regulator_register_notifier(struct regulator *regulator, 2325414c70cbSLiam Girdwood struct notifier_block *nb) 2326414c70cbSLiam Girdwood { 2327414c70cbSLiam Girdwood return blocking_notifier_chain_register(®ulator->rdev->notifier, 2328414c70cbSLiam Girdwood nb); 2329414c70cbSLiam Girdwood } 2330414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register_notifier); 2331414c70cbSLiam Girdwood 2332414c70cbSLiam Girdwood /** 2333414c70cbSLiam Girdwood * regulator_unregister_notifier - unregister regulator event notifier 2334414c70cbSLiam Girdwood * @regulator: regulator source 233569279fb9SMark Brown * @nb: notifier block 2336414c70cbSLiam Girdwood * 2337414c70cbSLiam Girdwood * Unregister regulator event notifier block. 2338414c70cbSLiam Girdwood */ 2339414c70cbSLiam Girdwood int regulator_unregister_notifier(struct regulator *regulator, 2340414c70cbSLiam Girdwood struct notifier_block *nb) 2341414c70cbSLiam Girdwood { 2342414c70cbSLiam Girdwood return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2343414c70cbSLiam Girdwood nb); 2344414c70cbSLiam Girdwood } 2345414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2346414c70cbSLiam Girdwood 2347b136fb44SJonathan Cameron /* notify regulator consumers and downstream regulator consumers. 2348b136fb44SJonathan Cameron * Note mutex must be held by caller. 2349b136fb44SJonathan Cameron */ 2350414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 2351414c70cbSLiam Girdwood unsigned long event, void *data) 2352414c70cbSLiam Girdwood { 2353414c70cbSLiam Girdwood /* call rdev chain first */ 2354414c70cbSLiam Girdwood blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2355414c70cbSLiam Girdwood } 2356414c70cbSLiam Girdwood 2357414c70cbSLiam Girdwood /** 2358414c70cbSLiam Girdwood * regulator_bulk_get - get multiple regulator consumers 2359414c70cbSLiam Girdwood * 2360414c70cbSLiam Girdwood * @dev: Device to supply 2361414c70cbSLiam Girdwood * @num_consumers: Number of consumers to register 2362414c70cbSLiam Girdwood * @consumers: Configuration of consumers; clients are stored here. 2363414c70cbSLiam Girdwood * 2364414c70cbSLiam Girdwood * @return 0 on success, an errno on failure. 2365414c70cbSLiam Girdwood * 2366414c70cbSLiam Girdwood * This helper function allows drivers to get several regulator 2367414c70cbSLiam Girdwood * consumers in one operation. If any of the regulators cannot be 2368414c70cbSLiam Girdwood * acquired then any regulators that were allocated will be freed 2369414c70cbSLiam Girdwood * before returning to the caller. 2370414c70cbSLiam Girdwood */ 2371414c70cbSLiam Girdwood int regulator_bulk_get(struct device *dev, int num_consumers, 2372414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2373414c70cbSLiam Girdwood { 2374414c70cbSLiam Girdwood int i; 2375414c70cbSLiam Girdwood int ret; 2376414c70cbSLiam Girdwood 2377414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) 2378414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2379414c70cbSLiam Girdwood 2380414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2381414c70cbSLiam Girdwood consumers[i].consumer = regulator_get(dev, 2382414c70cbSLiam Girdwood consumers[i].supply); 2383414c70cbSLiam Girdwood if (IS_ERR(consumers[i].consumer)) { 2384414c70cbSLiam Girdwood ret = PTR_ERR(consumers[i].consumer); 23855b307627SMark Brown dev_err(dev, "Failed to get supply '%s': %d\n", 23865b307627SMark Brown consumers[i].supply, ret); 2387414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2388414c70cbSLiam Girdwood goto err; 2389414c70cbSLiam Girdwood } 2390414c70cbSLiam Girdwood } 2391414c70cbSLiam Girdwood 2392414c70cbSLiam Girdwood return 0; 2393414c70cbSLiam Girdwood 2394414c70cbSLiam Girdwood err: 2395b29c7690SAxel Lin while (--i >= 0) 2396414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2397414c70cbSLiam Girdwood 2398414c70cbSLiam Girdwood return ret; 2399414c70cbSLiam Girdwood } 2400414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_get); 2401414c70cbSLiam Girdwood 2402f21e0e81SMark Brown static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2403f21e0e81SMark Brown { 2404f21e0e81SMark Brown struct regulator_bulk_data *bulk = data; 2405f21e0e81SMark Brown 2406f21e0e81SMark Brown bulk->ret = regulator_enable(bulk->consumer); 2407f21e0e81SMark Brown } 2408f21e0e81SMark Brown 2409414c70cbSLiam Girdwood /** 2410414c70cbSLiam Girdwood * regulator_bulk_enable - enable multiple regulator consumers 2411414c70cbSLiam Girdwood * 2412414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2413414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2414414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2415414c70cbSLiam Girdwood * 2416414c70cbSLiam Girdwood * This convenience API allows consumers to enable multiple regulator 2417414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2418414c70cbSLiam Girdwood * then any others that were enabled will be disabled again prior to 2419414c70cbSLiam Girdwood * return. 2420414c70cbSLiam Girdwood */ 2421414c70cbSLiam Girdwood int regulator_bulk_enable(int num_consumers, 2422414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2423414c70cbSLiam Girdwood { 2424f21e0e81SMark Brown LIST_HEAD(async_domain); 2425414c70cbSLiam Girdwood int i; 2426f21e0e81SMark Brown int ret = 0; 2427414c70cbSLiam Girdwood 2428f21e0e81SMark Brown for (i = 0; i < num_consumers; i++) 2429f21e0e81SMark Brown async_schedule_domain(regulator_bulk_enable_async, 2430f21e0e81SMark Brown &consumers[i], &async_domain); 2431f21e0e81SMark Brown 2432f21e0e81SMark Brown async_synchronize_full_domain(&async_domain); 2433f21e0e81SMark Brown 2434f21e0e81SMark Brown /* If any consumer failed we need to unwind any that succeeded */ 2435414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2436f21e0e81SMark Brown if (consumers[i].ret != 0) { 2437f21e0e81SMark Brown ret = consumers[i].ret; 2438414c70cbSLiam Girdwood goto err; 2439414c70cbSLiam Girdwood } 2440f21e0e81SMark Brown } 2441414c70cbSLiam Girdwood 2442414c70cbSLiam Girdwood return 0; 2443414c70cbSLiam Girdwood 2444414c70cbSLiam Girdwood err: 2445b29c7690SAxel Lin pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); 2446b29c7690SAxel Lin while (--i >= 0) 2447414c70cbSLiam Girdwood regulator_disable(consumers[i].consumer); 2448414c70cbSLiam Girdwood 2449414c70cbSLiam Girdwood return ret; 2450414c70cbSLiam Girdwood } 2451414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2452414c70cbSLiam Girdwood 2453414c70cbSLiam Girdwood /** 2454414c70cbSLiam Girdwood * regulator_bulk_disable - disable multiple regulator consumers 2455414c70cbSLiam Girdwood * 2456414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2457414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2458414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2459414c70cbSLiam Girdwood * 2460414c70cbSLiam Girdwood * This convenience API allows consumers to disable multiple regulator 246149e22632SSylwester Nawrocki * clients in a single API call. If any consumers cannot be disabled 246249e22632SSylwester Nawrocki * then any others that were disabled will be enabled again prior to 2463414c70cbSLiam Girdwood * return. 2464414c70cbSLiam Girdwood */ 2465414c70cbSLiam Girdwood int regulator_bulk_disable(int num_consumers, 2466414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2467414c70cbSLiam Girdwood { 2468414c70cbSLiam Girdwood int i; 2469414c70cbSLiam Girdwood int ret; 2470414c70cbSLiam Girdwood 247149e22632SSylwester Nawrocki for (i = num_consumers - 1; i >= 0; --i) { 2472414c70cbSLiam Girdwood ret = regulator_disable(consumers[i].consumer); 2473414c70cbSLiam Girdwood if (ret != 0) 2474414c70cbSLiam Girdwood goto err; 2475414c70cbSLiam Girdwood } 2476414c70cbSLiam Girdwood 2477414c70cbSLiam Girdwood return 0; 2478414c70cbSLiam Girdwood 2479414c70cbSLiam Girdwood err: 24805da84fd9SJoe Perches pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 248149e22632SSylwester Nawrocki for (++i; i < num_consumers; ++i) 2482414c70cbSLiam Girdwood regulator_enable(consumers[i].consumer); 2483414c70cbSLiam Girdwood 2484414c70cbSLiam Girdwood return ret; 2485414c70cbSLiam Girdwood } 2486414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2487414c70cbSLiam Girdwood 2488414c70cbSLiam Girdwood /** 2489e1de2f42SDonggeun Kim * regulator_bulk_force_disable - force disable multiple regulator consumers 2490e1de2f42SDonggeun Kim * 2491e1de2f42SDonggeun Kim * @num_consumers: Number of consumers 2492e1de2f42SDonggeun Kim * @consumers: Consumer data; clients are stored here. 2493e1de2f42SDonggeun Kim * @return 0 on success, an errno on failure 2494e1de2f42SDonggeun Kim * 2495e1de2f42SDonggeun Kim * This convenience API allows consumers to forcibly disable multiple regulator 2496e1de2f42SDonggeun Kim * clients in a single API call. 2497e1de2f42SDonggeun Kim * NOTE: This should be used for situations when device damage will 2498e1de2f42SDonggeun Kim * likely occur if the regulators are not disabled (e.g. over temp). 2499e1de2f42SDonggeun Kim * Although regulator_force_disable function call for some consumers can 2500e1de2f42SDonggeun Kim * return error numbers, the function is called for all consumers. 2501e1de2f42SDonggeun Kim */ 2502e1de2f42SDonggeun Kim int regulator_bulk_force_disable(int num_consumers, 2503e1de2f42SDonggeun Kim struct regulator_bulk_data *consumers) 2504e1de2f42SDonggeun Kim { 2505e1de2f42SDonggeun Kim int i; 2506e1de2f42SDonggeun Kim int ret; 2507e1de2f42SDonggeun Kim 2508e1de2f42SDonggeun Kim for (i = 0; i < num_consumers; i++) 2509e1de2f42SDonggeun Kim consumers[i].ret = 2510e1de2f42SDonggeun Kim regulator_force_disable(consumers[i].consumer); 2511e1de2f42SDonggeun Kim 2512e1de2f42SDonggeun Kim for (i = 0; i < num_consumers; i++) { 2513e1de2f42SDonggeun Kim if (consumers[i].ret != 0) { 2514e1de2f42SDonggeun Kim ret = consumers[i].ret; 2515e1de2f42SDonggeun Kim goto out; 2516e1de2f42SDonggeun Kim } 2517e1de2f42SDonggeun Kim } 2518e1de2f42SDonggeun Kim 2519e1de2f42SDonggeun Kim return 0; 2520e1de2f42SDonggeun Kim out: 2521e1de2f42SDonggeun Kim return ret; 2522e1de2f42SDonggeun Kim } 2523e1de2f42SDonggeun Kim EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); 2524e1de2f42SDonggeun Kim 2525e1de2f42SDonggeun Kim /** 2526414c70cbSLiam Girdwood * regulator_bulk_free - free multiple regulator consumers 2527414c70cbSLiam Girdwood * 2528414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2529414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2530414c70cbSLiam Girdwood * 2531414c70cbSLiam Girdwood * This convenience API allows consumers to free multiple regulator 2532414c70cbSLiam Girdwood * clients in a single API call. 2533414c70cbSLiam Girdwood */ 2534414c70cbSLiam Girdwood void regulator_bulk_free(int num_consumers, 2535414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2536414c70cbSLiam Girdwood { 2537414c70cbSLiam Girdwood int i; 2538414c70cbSLiam Girdwood 2539414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2540414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2541414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2542414c70cbSLiam Girdwood } 2543414c70cbSLiam Girdwood } 2544414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_free); 2545414c70cbSLiam Girdwood 2546414c70cbSLiam Girdwood /** 2547414c70cbSLiam Girdwood * regulator_notifier_call_chain - call regulator event notifier 254869279fb9SMark Brown * @rdev: regulator source 2549414c70cbSLiam Girdwood * @event: notifier block 255069279fb9SMark Brown * @data: callback-specific data. 2551414c70cbSLiam Girdwood * 2552414c70cbSLiam Girdwood * Called by regulator drivers to notify clients a regulator event has 2553414c70cbSLiam Girdwood * occurred. We also notify regulator clients downstream. 2554b136fb44SJonathan Cameron * Note lock must be held by caller. 2555414c70cbSLiam Girdwood */ 2556414c70cbSLiam Girdwood int regulator_notifier_call_chain(struct regulator_dev *rdev, 2557414c70cbSLiam Girdwood unsigned long event, void *data) 2558414c70cbSLiam Girdwood { 2559414c70cbSLiam Girdwood _notifier_call_chain(rdev, event, data); 2560414c70cbSLiam Girdwood return NOTIFY_DONE; 2561414c70cbSLiam Girdwood 2562414c70cbSLiam Girdwood } 2563414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2564414c70cbSLiam Girdwood 2565be721979SMark Brown /** 2566be721979SMark Brown * regulator_mode_to_status - convert a regulator mode into a status 2567be721979SMark Brown * 2568be721979SMark Brown * @mode: Mode to convert 2569be721979SMark Brown * 2570be721979SMark Brown * Convert a regulator mode into a status. 2571be721979SMark Brown */ 2572be721979SMark Brown int regulator_mode_to_status(unsigned int mode) 2573be721979SMark Brown { 2574be721979SMark Brown switch (mode) { 2575be721979SMark Brown case REGULATOR_MODE_FAST: 2576be721979SMark Brown return REGULATOR_STATUS_FAST; 2577be721979SMark Brown case REGULATOR_MODE_NORMAL: 2578be721979SMark Brown return REGULATOR_STATUS_NORMAL; 2579be721979SMark Brown case REGULATOR_MODE_IDLE: 2580be721979SMark Brown return REGULATOR_STATUS_IDLE; 2581be721979SMark Brown case REGULATOR_STATUS_STANDBY: 2582be721979SMark Brown return REGULATOR_STATUS_STANDBY; 2583be721979SMark Brown default: 2584be721979SMark Brown return 0; 2585be721979SMark Brown } 2586be721979SMark Brown } 2587be721979SMark Brown EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2588be721979SMark Brown 25897ad68e2fSDavid Brownell /* 25907ad68e2fSDavid Brownell * To avoid cluttering sysfs (and memory) with useless state, only 25917ad68e2fSDavid Brownell * create attributes that can be meaningfully displayed. 25927ad68e2fSDavid Brownell */ 25937ad68e2fSDavid Brownell static int add_regulator_attributes(struct regulator_dev *rdev) 25947ad68e2fSDavid Brownell { 25957ad68e2fSDavid Brownell struct device *dev = &rdev->dev; 25967ad68e2fSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 25977ad68e2fSDavid Brownell int status = 0; 25987ad68e2fSDavid Brownell 25997ad68e2fSDavid Brownell /* some attributes need specific methods to be displayed */ 26004c78899bSMark Brown if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 26014c78899bSMark Brown (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 26027ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microvolts); 26037ad68e2fSDavid Brownell if (status < 0) 26047ad68e2fSDavid Brownell return status; 26057ad68e2fSDavid Brownell } 26067ad68e2fSDavid Brownell if (ops->get_current_limit) { 26077ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microamps); 26087ad68e2fSDavid Brownell if (status < 0) 26097ad68e2fSDavid Brownell return status; 26107ad68e2fSDavid Brownell } 26117ad68e2fSDavid Brownell if (ops->get_mode) { 26127ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_opmode); 26137ad68e2fSDavid Brownell if (status < 0) 26147ad68e2fSDavid Brownell return status; 26157ad68e2fSDavid Brownell } 26167ad68e2fSDavid Brownell if (ops->is_enabled) { 26177ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_state); 26187ad68e2fSDavid Brownell if (status < 0) 26197ad68e2fSDavid Brownell return status; 26207ad68e2fSDavid Brownell } 2621853116a1SDavid Brownell if (ops->get_status) { 2622853116a1SDavid Brownell status = device_create_file(dev, &dev_attr_status); 2623853116a1SDavid Brownell if (status < 0) 2624853116a1SDavid Brownell return status; 2625853116a1SDavid Brownell } 26267ad68e2fSDavid Brownell 26277ad68e2fSDavid Brownell /* some attributes are type-specific */ 26287ad68e2fSDavid Brownell if (rdev->desc->type == REGULATOR_CURRENT) { 26297ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_requested_microamps); 26307ad68e2fSDavid Brownell if (status < 0) 26317ad68e2fSDavid Brownell return status; 26327ad68e2fSDavid Brownell } 26337ad68e2fSDavid Brownell 26347ad68e2fSDavid Brownell /* all the other attributes exist to support constraints; 26357ad68e2fSDavid Brownell * don't show them if there are no constraints, or if the 26367ad68e2fSDavid Brownell * relevant supporting methods are missing. 26377ad68e2fSDavid Brownell */ 26387ad68e2fSDavid Brownell if (!rdev->constraints) 26397ad68e2fSDavid Brownell return status; 26407ad68e2fSDavid Brownell 26417ad68e2fSDavid Brownell /* constraints need specific supporting methods */ 2642e8eef82bSMark Brown if (ops->set_voltage || ops->set_voltage_sel) { 26437ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microvolts); 26447ad68e2fSDavid Brownell if (status < 0) 26457ad68e2fSDavid Brownell return status; 26467ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microvolts); 26477ad68e2fSDavid Brownell if (status < 0) 26487ad68e2fSDavid Brownell return status; 26497ad68e2fSDavid Brownell } 26507ad68e2fSDavid Brownell if (ops->set_current_limit) { 26517ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microamps); 26527ad68e2fSDavid Brownell if (status < 0) 26537ad68e2fSDavid Brownell return status; 26547ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microamps); 26557ad68e2fSDavid Brownell if (status < 0) 26567ad68e2fSDavid Brownell return status; 26577ad68e2fSDavid Brownell } 26587ad68e2fSDavid Brownell 26597ad68e2fSDavid Brownell /* suspend mode constraints need multiple supporting methods */ 26607ad68e2fSDavid Brownell if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 26617ad68e2fSDavid Brownell return status; 26627ad68e2fSDavid Brownell 26637ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_standby_state); 26647ad68e2fSDavid Brownell if (status < 0) 26657ad68e2fSDavid Brownell return status; 26667ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_mem_state); 26677ad68e2fSDavid Brownell if (status < 0) 26687ad68e2fSDavid Brownell return status; 26697ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_disk_state); 26707ad68e2fSDavid Brownell if (status < 0) 26717ad68e2fSDavid Brownell return status; 26727ad68e2fSDavid Brownell 26737ad68e2fSDavid Brownell if (ops->set_suspend_voltage) { 26747ad68e2fSDavid Brownell status = device_create_file(dev, 26757ad68e2fSDavid Brownell &dev_attr_suspend_standby_microvolts); 26767ad68e2fSDavid Brownell if (status < 0) 26777ad68e2fSDavid Brownell return status; 26787ad68e2fSDavid Brownell status = device_create_file(dev, 26797ad68e2fSDavid Brownell &dev_attr_suspend_mem_microvolts); 26807ad68e2fSDavid Brownell if (status < 0) 26817ad68e2fSDavid Brownell return status; 26827ad68e2fSDavid Brownell status = device_create_file(dev, 26837ad68e2fSDavid Brownell &dev_attr_suspend_disk_microvolts); 26847ad68e2fSDavid Brownell if (status < 0) 26857ad68e2fSDavid Brownell return status; 26867ad68e2fSDavid Brownell } 26877ad68e2fSDavid Brownell 26887ad68e2fSDavid Brownell if (ops->set_suspend_mode) { 26897ad68e2fSDavid Brownell status = device_create_file(dev, 26907ad68e2fSDavid Brownell &dev_attr_suspend_standby_mode); 26917ad68e2fSDavid Brownell if (status < 0) 26927ad68e2fSDavid Brownell return status; 26937ad68e2fSDavid Brownell status = device_create_file(dev, 26947ad68e2fSDavid Brownell &dev_attr_suspend_mem_mode); 26957ad68e2fSDavid Brownell if (status < 0) 26967ad68e2fSDavid Brownell return status; 26977ad68e2fSDavid Brownell status = device_create_file(dev, 26987ad68e2fSDavid Brownell &dev_attr_suspend_disk_mode); 26997ad68e2fSDavid Brownell if (status < 0) 27007ad68e2fSDavid Brownell return status; 27017ad68e2fSDavid Brownell } 27027ad68e2fSDavid Brownell 27037ad68e2fSDavid Brownell return status; 27047ad68e2fSDavid Brownell } 27057ad68e2fSDavid Brownell 27061130e5b3SMark Brown static void rdev_init_debugfs(struct regulator_dev *rdev) 27071130e5b3SMark Brown { 27081130e5b3SMark Brown rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 270924751434SStephen Boyd if (!rdev->debugfs) { 27101130e5b3SMark Brown rdev_warn(rdev, "Failed to create debugfs directory\n"); 27111130e5b3SMark Brown return; 27121130e5b3SMark Brown } 27131130e5b3SMark Brown 27141130e5b3SMark Brown debugfs_create_u32("use_count", 0444, rdev->debugfs, 27151130e5b3SMark Brown &rdev->use_count); 27161130e5b3SMark Brown debugfs_create_u32("open_count", 0444, rdev->debugfs, 27171130e5b3SMark Brown &rdev->open_count); 27181130e5b3SMark Brown } 27191130e5b3SMark Brown 2720414c70cbSLiam Girdwood /** 2721414c70cbSLiam Girdwood * regulator_register - register regulator 272269279fb9SMark Brown * @regulator_desc: regulator to register 272369279fb9SMark Brown * @dev: struct device for the regulator 27240527100fSMark Brown * @init_data: platform provided init data, passed through by driver 272569279fb9SMark Brown * @driver_data: private regulator data 2726414c70cbSLiam Girdwood * 2727414c70cbSLiam Girdwood * Called by regulator drivers to register a regulator. 2728414c70cbSLiam Girdwood * Returns 0 on success. 2729414c70cbSLiam Girdwood */ 2730414c70cbSLiam Girdwood struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2731f8c12fe3SMark Brown struct device *dev, const struct regulator_init_data *init_data, 27322c043bcbSRajendra Nayak void *driver_data, struct device_node *of_node) 2733414c70cbSLiam Girdwood { 27349a8f5e07SMark Brown const struct regulation_constraints *constraints = NULL; 2735414c70cbSLiam Girdwood static atomic_t regulator_no = ATOMIC_INIT(0); 2736414c70cbSLiam Girdwood struct regulator_dev *rdev; 2737a5766f11SLiam Girdwood int ret, i; 273869511a45SRajendra Nayak const char *supply = NULL; 2739414c70cbSLiam Girdwood 2740414c70cbSLiam Girdwood if (regulator_desc == NULL) 2741414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2742414c70cbSLiam Girdwood 2743414c70cbSLiam Girdwood if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2744414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2745414c70cbSLiam Girdwood 2746cd78dfc6SDiego Liziero if (regulator_desc->type != REGULATOR_VOLTAGE && 2747cd78dfc6SDiego Liziero regulator_desc->type != REGULATOR_CURRENT) 2748414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2749414c70cbSLiam Girdwood 2750476c2d83SMark Brown /* Only one of each should be implemented */ 2751476c2d83SMark Brown WARN_ON(regulator_desc->ops->get_voltage && 2752476c2d83SMark Brown regulator_desc->ops->get_voltage_sel); 2753e8eef82bSMark Brown WARN_ON(regulator_desc->ops->set_voltage && 2754e8eef82bSMark Brown regulator_desc->ops->set_voltage_sel); 2755476c2d83SMark Brown 2756476c2d83SMark Brown /* If we're using selectors we must implement list_voltage. */ 2757476c2d83SMark Brown if (regulator_desc->ops->get_voltage_sel && 2758476c2d83SMark Brown !regulator_desc->ops->list_voltage) { 2759476c2d83SMark Brown return ERR_PTR(-EINVAL); 2760476c2d83SMark Brown } 2761e8eef82bSMark Brown if (regulator_desc->ops->set_voltage_sel && 2762e8eef82bSMark Brown !regulator_desc->ops->list_voltage) { 2763e8eef82bSMark Brown return ERR_PTR(-EINVAL); 2764e8eef82bSMark Brown } 2765476c2d83SMark Brown 2766414c70cbSLiam Girdwood rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2767414c70cbSLiam Girdwood if (rdev == NULL) 2768414c70cbSLiam Girdwood return ERR_PTR(-ENOMEM); 2769414c70cbSLiam Girdwood 2770414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2771414c70cbSLiam Girdwood 2772414c70cbSLiam Girdwood mutex_init(&rdev->mutex); 2773a5766f11SLiam Girdwood rdev->reg_data = driver_data; 2774414c70cbSLiam Girdwood rdev->owner = regulator_desc->owner; 2775414c70cbSLiam Girdwood rdev->desc = regulator_desc; 2776414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->consumer_list); 2777414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->list); 2778414c70cbSLiam Girdwood BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2779da07ecd9SMark Brown INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2780414c70cbSLiam Girdwood 2781a5766f11SLiam Girdwood /* preform any regulator specific init */ 27829a8f5e07SMark Brown if (init_data && init_data->regulator_init) { 2783a5766f11SLiam Girdwood ret = init_data->regulator_init(rdev->reg_data); 27844fca9545SDavid Brownell if (ret < 0) 27854fca9545SDavid Brownell goto clean; 2786a5766f11SLiam Girdwood } 2787a5766f11SLiam Girdwood 2788a5766f11SLiam Girdwood /* register with sysfs */ 2789a5766f11SLiam Girdwood rdev->dev.class = ®ulator_class; 27902c043bcbSRajendra Nayak rdev->dev.of_node = of_node; 2791a5766f11SLiam Girdwood rdev->dev.parent = dev; 2792812460a9SKay Sievers dev_set_name(&rdev->dev, "regulator.%d", 2793812460a9SKay Sievers atomic_inc_return(®ulator_no) - 1); 2794a5766f11SLiam Girdwood ret = device_register(&rdev->dev); 2795ad7725cbSVasiliy Kulikov if (ret != 0) { 2796ad7725cbSVasiliy Kulikov put_device(&rdev->dev); 27974fca9545SDavid Brownell goto clean; 2798ad7725cbSVasiliy Kulikov } 2799a5766f11SLiam Girdwood 2800a5766f11SLiam Girdwood dev_set_drvdata(&rdev->dev, rdev); 2801a5766f11SLiam Girdwood 280274f544c1SMike Rapoport /* set regulator constraints */ 28039a8f5e07SMark Brown if (init_data) 28049a8f5e07SMark Brown constraints = &init_data->constraints; 28059a8f5e07SMark Brown 28069a8f5e07SMark Brown ret = set_machine_constraints(rdev, constraints); 280774f544c1SMike Rapoport if (ret < 0) 280874f544c1SMike Rapoport goto scrub; 280974f544c1SMike Rapoport 28107ad68e2fSDavid Brownell /* add attributes supported by this regulator */ 28117ad68e2fSDavid Brownell ret = add_regulator_attributes(rdev); 28127ad68e2fSDavid Brownell if (ret < 0) 28137ad68e2fSDavid Brownell goto scrub; 28147ad68e2fSDavid Brownell 28159a8f5e07SMark Brown if (init_data && init_data->supply_regulator) 281669511a45SRajendra Nayak supply = init_data->supply_regulator; 281769511a45SRajendra Nayak else if (regulator_desc->supply_name) 281869511a45SRajendra Nayak supply = regulator_desc->supply_name; 281969511a45SRajendra Nayak 282069511a45SRajendra Nayak if (supply) { 28210178f3e2SMark Brown struct regulator_dev *r; 28220178f3e2SMark Brown 282369511a45SRajendra Nayak r = regulator_dev_lookup(dev, supply); 28240178f3e2SMark Brown 282569511a45SRajendra Nayak if (!r) { 282669511a45SRajendra Nayak dev_err(dev, "Failed to find supply %s\n", supply); 28277727da22SAxel Lin ret = -ENODEV; 28280178f3e2SMark Brown goto scrub; 28290178f3e2SMark Brown } 28300178f3e2SMark Brown 28310178f3e2SMark Brown ret = set_supply(rdev, r); 28320178f3e2SMark Brown if (ret < 0) 28330178f3e2SMark Brown goto scrub; 2834b2296bd4SLaxman Dewangan 2835b2296bd4SLaxman Dewangan /* Enable supply if rail is enabled */ 2836b2296bd4SLaxman Dewangan if (rdev->desc->ops->is_enabled && 2837b2296bd4SLaxman Dewangan rdev->desc->ops->is_enabled(rdev)) { 2838b2296bd4SLaxman Dewangan ret = regulator_enable(rdev->supply); 2839b2296bd4SLaxman Dewangan if (ret < 0) 2840b2296bd4SLaxman Dewangan goto scrub; 2841b2296bd4SLaxman Dewangan } 28420178f3e2SMark Brown } 28430178f3e2SMark Brown 2844a5766f11SLiam Girdwood /* add consumers devices */ 28459a8f5e07SMark Brown if (init_data) { 2846a5766f11SLiam Girdwood for (i = 0; i < init_data->num_consumer_supplies; i++) { 2847a5766f11SLiam Girdwood ret = set_consumer_device_supply(rdev, 2848a5766f11SLiam Girdwood init_data->consumer_supplies[i].dev, 284940f9244fSMark Brown init_data->consumer_supplies[i].dev_name, 2850a5766f11SLiam Girdwood init_data->consumer_supplies[i].supply); 285123c2f041SMark Brown if (ret < 0) { 285223c2f041SMark Brown dev_err(dev, "Failed to set supply %s\n", 285323c2f041SMark Brown init_data->consumer_supplies[i].supply); 2854d4033b54SJani Nikula goto unset_supplies; 2855a5766f11SLiam Girdwood } 285623c2f041SMark Brown } 28579a8f5e07SMark Brown } 2858a5766f11SLiam Girdwood 2859a5766f11SLiam Girdwood list_add(&rdev->list, ®ulator_list); 28601130e5b3SMark Brown 28611130e5b3SMark Brown rdev_init_debugfs(rdev); 2862a5766f11SLiam Girdwood out: 2863414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2864414c70cbSLiam Girdwood return rdev; 28654fca9545SDavid Brownell 2866d4033b54SJani Nikula unset_supplies: 2867d4033b54SJani Nikula unset_regulator_supplies(rdev); 2868d4033b54SJani Nikula 28694fca9545SDavid Brownell scrub: 28701a6958e7SAxel Lin kfree(rdev->constraints); 28714fca9545SDavid Brownell device_unregister(&rdev->dev); 287253032dafSPaul Walmsley /* device core frees rdev */ 287353032dafSPaul Walmsley rdev = ERR_PTR(ret); 287453032dafSPaul Walmsley goto out; 287553032dafSPaul Walmsley 28764fca9545SDavid Brownell clean: 28774fca9545SDavid Brownell kfree(rdev); 28784fca9545SDavid Brownell rdev = ERR_PTR(ret); 28794fca9545SDavid Brownell goto out; 2880414c70cbSLiam Girdwood } 2881414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register); 2882414c70cbSLiam Girdwood 2883414c70cbSLiam Girdwood /** 2884414c70cbSLiam Girdwood * regulator_unregister - unregister regulator 288569279fb9SMark Brown * @rdev: regulator to unregister 2886414c70cbSLiam Girdwood * 2887414c70cbSLiam Girdwood * Called by regulator drivers to unregister a regulator. 2888414c70cbSLiam Girdwood */ 2889414c70cbSLiam Girdwood void regulator_unregister(struct regulator_dev *rdev) 2890414c70cbSLiam Girdwood { 2891414c70cbSLiam Girdwood if (rdev == NULL) 2892414c70cbSLiam Girdwood return; 2893414c70cbSLiam Girdwood 2894414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 28951130e5b3SMark Brown debugfs_remove_recursive(rdev->debugfs); 2896da07ecd9SMark Brown flush_work_sync(&rdev->disable_work.work); 28976bf87d17SMark Brown WARN_ON(rdev->open_count); 28980f1d747bSMike Rapoport unset_regulator_supplies(rdev); 2899414c70cbSLiam Girdwood list_del(&rdev->list); 2900414c70cbSLiam Girdwood if (rdev->supply) 29013801b86aSMark Brown regulator_put(rdev->supply); 2902f8c12fe3SMark Brown kfree(rdev->constraints); 290358fb5cf5SLothar Waßmann device_unregister(&rdev->dev); 2904414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2905414c70cbSLiam Girdwood } 2906414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister); 2907414c70cbSLiam Girdwood 2908414c70cbSLiam Girdwood /** 2909cf7bbcdfSMark Brown * regulator_suspend_prepare - prepare regulators for system wide suspend 2910414c70cbSLiam Girdwood * @state: system suspend state 2911414c70cbSLiam Girdwood * 2912414c70cbSLiam Girdwood * Configure each regulator with it's suspend operating parameters for state. 2913414c70cbSLiam Girdwood * This will usually be called by machine suspend code prior to supending. 2914414c70cbSLiam Girdwood */ 2915414c70cbSLiam Girdwood int regulator_suspend_prepare(suspend_state_t state) 2916414c70cbSLiam Girdwood { 2917414c70cbSLiam Girdwood struct regulator_dev *rdev; 2918414c70cbSLiam Girdwood int ret = 0; 2919414c70cbSLiam Girdwood 2920414c70cbSLiam Girdwood /* ON is handled by regulator active state */ 2921414c70cbSLiam Girdwood if (state == PM_SUSPEND_ON) 2922414c70cbSLiam Girdwood return -EINVAL; 2923414c70cbSLiam Girdwood 2924414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2925414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 2926414c70cbSLiam Girdwood 2927414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2928414c70cbSLiam Girdwood ret = suspend_prepare(rdev, state); 2929414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2930414c70cbSLiam Girdwood 2931414c70cbSLiam Girdwood if (ret < 0) { 29325da84fd9SJoe Perches rdev_err(rdev, "failed to prepare\n"); 2933414c70cbSLiam Girdwood goto out; 2934414c70cbSLiam Girdwood } 2935414c70cbSLiam Girdwood } 2936414c70cbSLiam Girdwood out: 2937414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2938414c70cbSLiam Girdwood return ret; 2939414c70cbSLiam Girdwood } 2940414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2941414c70cbSLiam Girdwood 2942414c70cbSLiam Girdwood /** 29437a32b589SMyungJoo Ham * regulator_suspend_finish - resume regulators from system wide suspend 29447a32b589SMyungJoo Ham * 29457a32b589SMyungJoo Ham * Turn on regulators that might be turned off by regulator_suspend_prepare 29467a32b589SMyungJoo Ham * and that should be turned on according to the regulators properties. 29477a32b589SMyungJoo Ham */ 29487a32b589SMyungJoo Ham int regulator_suspend_finish(void) 29497a32b589SMyungJoo Ham { 29507a32b589SMyungJoo Ham struct regulator_dev *rdev; 29517a32b589SMyungJoo Ham int ret = 0, error; 29527a32b589SMyungJoo Ham 29537a32b589SMyungJoo Ham mutex_lock(®ulator_list_mutex); 29547a32b589SMyungJoo Ham list_for_each_entry(rdev, ®ulator_list, list) { 29557a32b589SMyungJoo Ham struct regulator_ops *ops = rdev->desc->ops; 29567a32b589SMyungJoo Ham 29577a32b589SMyungJoo Ham mutex_lock(&rdev->mutex); 29587a32b589SMyungJoo Ham if ((rdev->use_count > 0 || rdev->constraints->always_on) && 29597a32b589SMyungJoo Ham ops->enable) { 29607a32b589SMyungJoo Ham error = ops->enable(rdev); 29617a32b589SMyungJoo Ham if (error) 29627a32b589SMyungJoo Ham ret = error; 29637a32b589SMyungJoo Ham } else { 29647a32b589SMyungJoo Ham if (!has_full_constraints) 29657a32b589SMyungJoo Ham goto unlock; 29667a32b589SMyungJoo Ham if (!ops->disable) 29677a32b589SMyungJoo Ham goto unlock; 29687a32b589SMyungJoo Ham if (ops->is_enabled && !ops->is_enabled(rdev)) 29697a32b589SMyungJoo Ham goto unlock; 29707a32b589SMyungJoo Ham 29717a32b589SMyungJoo Ham error = ops->disable(rdev); 29727a32b589SMyungJoo Ham if (error) 29737a32b589SMyungJoo Ham ret = error; 29747a32b589SMyungJoo Ham } 29757a32b589SMyungJoo Ham unlock: 29767a32b589SMyungJoo Ham mutex_unlock(&rdev->mutex); 29777a32b589SMyungJoo Ham } 29787a32b589SMyungJoo Ham mutex_unlock(®ulator_list_mutex); 29797a32b589SMyungJoo Ham return ret; 29807a32b589SMyungJoo Ham } 29817a32b589SMyungJoo Ham EXPORT_SYMBOL_GPL(regulator_suspend_finish); 29827a32b589SMyungJoo Ham 29837a32b589SMyungJoo Ham /** 2984ca725561SMark Brown * regulator_has_full_constraints - the system has fully specified constraints 2985ca725561SMark Brown * 2986ca725561SMark Brown * Calling this function will cause the regulator API to disable all 2987ca725561SMark Brown * regulators which have a zero use count and don't have an always_on 2988ca725561SMark Brown * constraint in a late_initcall. 2989ca725561SMark Brown * 2990ca725561SMark Brown * The intention is that this will become the default behaviour in a 2991ca725561SMark Brown * future kernel release so users are encouraged to use this facility 2992ca725561SMark Brown * now. 2993ca725561SMark Brown */ 2994ca725561SMark Brown void regulator_has_full_constraints(void) 2995ca725561SMark Brown { 2996ca725561SMark Brown has_full_constraints = 1; 2997ca725561SMark Brown } 2998ca725561SMark Brown EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2999ca725561SMark Brown 3000ca725561SMark Brown /** 3001688fe99aSMark Brown * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 3002688fe99aSMark Brown * 3003688fe99aSMark Brown * Calling this function will cause the regulator API to provide a 3004688fe99aSMark Brown * dummy regulator to consumers if no physical regulator is found, 3005688fe99aSMark Brown * allowing most consumers to proceed as though a regulator were 3006688fe99aSMark Brown * configured. This allows systems such as those with software 3007688fe99aSMark Brown * controllable regulators for the CPU core only to be brought up more 3008688fe99aSMark Brown * readily. 3009688fe99aSMark Brown */ 3010688fe99aSMark Brown void regulator_use_dummy_regulator(void) 3011688fe99aSMark Brown { 3012688fe99aSMark Brown board_wants_dummy_regulator = true; 3013688fe99aSMark Brown } 3014688fe99aSMark Brown EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 3015688fe99aSMark Brown 3016688fe99aSMark Brown /** 3017414c70cbSLiam Girdwood * rdev_get_drvdata - get rdev regulator driver data 301869279fb9SMark Brown * @rdev: regulator 3019414c70cbSLiam Girdwood * 3020414c70cbSLiam Girdwood * Get rdev regulator driver private data. This call can be used in the 3021414c70cbSLiam Girdwood * regulator driver context. 3022414c70cbSLiam Girdwood */ 3023414c70cbSLiam Girdwood void *rdev_get_drvdata(struct regulator_dev *rdev) 3024414c70cbSLiam Girdwood { 3025414c70cbSLiam Girdwood return rdev->reg_data; 3026414c70cbSLiam Girdwood } 3027414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_drvdata); 3028414c70cbSLiam Girdwood 3029414c70cbSLiam Girdwood /** 3030414c70cbSLiam Girdwood * regulator_get_drvdata - get regulator driver data 3031414c70cbSLiam Girdwood * @regulator: regulator 3032414c70cbSLiam Girdwood * 3033414c70cbSLiam Girdwood * Get regulator driver private data. This call can be used in the consumer 3034414c70cbSLiam Girdwood * driver context when non API regulator specific functions need to be called. 3035414c70cbSLiam Girdwood */ 3036414c70cbSLiam Girdwood void *regulator_get_drvdata(struct regulator *regulator) 3037414c70cbSLiam Girdwood { 3038414c70cbSLiam Girdwood return regulator->rdev->reg_data; 3039414c70cbSLiam Girdwood } 3040414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3041414c70cbSLiam Girdwood 3042414c70cbSLiam Girdwood /** 3043414c70cbSLiam Girdwood * regulator_set_drvdata - set regulator driver data 3044414c70cbSLiam Girdwood * @regulator: regulator 3045414c70cbSLiam Girdwood * @data: data 3046414c70cbSLiam Girdwood */ 3047414c70cbSLiam Girdwood void regulator_set_drvdata(struct regulator *regulator, void *data) 3048414c70cbSLiam Girdwood { 3049414c70cbSLiam Girdwood regulator->rdev->reg_data = data; 3050414c70cbSLiam Girdwood } 3051414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3052414c70cbSLiam Girdwood 3053414c70cbSLiam Girdwood /** 3054414c70cbSLiam Girdwood * regulator_get_id - get regulator ID 305569279fb9SMark Brown * @rdev: regulator 3056414c70cbSLiam Girdwood */ 3057414c70cbSLiam Girdwood int rdev_get_id(struct regulator_dev *rdev) 3058414c70cbSLiam Girdwood { 3059414c70cbSLiam Girdwood return rdev->desc->id; 3060414c70cbSLiam Girdwood } 3061414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_id); 3062414c70cbSLiam Girdwood 3063a5766f11SLiam Girdwood struct device *rdev_get_dev(struct regulator_dev *rdev) 3064a5766f11SLiam Girdwood { 3065a5766f11SLiam Girdwood return &rdev->dev; 3066a5766f11SLiam Girdwood } 3067a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_dev); 3068a5766f11SLiam Girdwood 3069a5766f11SLiam Girdwood void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3070a5766f11SLiam Girdwood { 3071a5766f11SLiam Girdwood return reg_init_data->driver_data; 3072a5766f11SLiam Girdwood } 3073a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3074a5766f11SLiam Girdwood 3075ba55a974SMark Brown #ifdef CONFIG_DEBUG_FS 3076ba55a974SMark Brown static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3077ba55a974SMark Brown size_t count, loff_t *ppos) 3078ba55a974SMark Brown { 3079ba55a974SMark Brown char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3080ba55a974SMark Brown ssize_t len, ret = 0; 3081ba55a974SMark Brown struct regulator_map *map; 3082ba55a974SMark Brown 3083ba55a974SMark Brown if (!buf) 3084ba55a974SMark Brown return -ENOMEM; 3085ba55a974SMark Brown 3086ba55a974SMark Brown list_for_each_entry(map, ®ulator_map_list, list) { 3087ba55a974SMark Brown len = snprintf(buf + ret, PAGE_SIZE - ret, 3088ba55a974SMark Brown "%s -> %s.%s\n", 3089ba55a974SMark Brown rdev_get_name(map->regulator), map->dev_name, 3090ba55a974SMark Brown map->supply); 3091ba55a974SMark Brown if (len >= 0) 3092ba55a974SMark Brown ret += len; 3093ba55a974SMark Brown if (ret > PAGE_SIZE) { 3094ba55a974SMark Brown ret = PAGE_SIZE; 3095ba55a974SMark Brown break; 3096ba55a974SMark Brown } 3097ba55a974SMark Brown } 3098ba55a974SMark Brown 3099ba55a974SMark Brown ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3100ba55a974SMark Brown 3101ba55a974SMark Brown kfree(buf); 3102ba55a974SMark Brown 3103ba55a974SMark Brown return ret; 3104ba55a974SMark Brown } 310524751434SStephen Boyd #endif 3106ba55a974SMark Brown 3107ba55a974SMark Brown static const struct file_operations supply_map_fops = { 310824751434SStephen Boyd #ifdef CONFIG_DEBUG_FS 3109ba55a974SMark Brown .read = supply_map_read_file, 3110ba55a974SMark Brown .llseek = default_llseek, 3111ba55a974SMark Brown #endif 311224751434SStephen Boyd }; 3113ba55a974SMark Brown 3114414c70cbSLiam Girdwood static int __init regulator_init(void) 3115414c70cbSLiam Girdwood { 311634abbd68SMark Brown int ret; 311734abbd68SMark Brown 311834abbd68SMark Brown ret = class_register(®ulator_class); 311934abbd68SMark Brown 31201130e5b3SMark Brown debugfs_root = debugfs_create_dir("regulator", NULL); 312124751434SStephen Boyd if (!debugfs_root) 31221130e5b3SMark Brown pr_warn("regulator: Failed to create debugfs directory\n"); 3123ba55a974SMark Brown 3124f4d562c6SMark Brown debugfs_create_file("supply_map", 0444, debugfs_root, NULL, 3125f4d562c6SMark Brown &supply_map_fops); 31261130e5b3SMark Brown 312734abbd68SMark Brown regulator_dummy_init(); 312834abbd68SMark Brown 312934abbd68SMark Brown return ret; 3130414c70cbSLiam Girdwood } 3131414c70cbSLiam Girdwood 3132414c70cbSLiam Girdwood /* init early to allow our consumers to complete system booting */ 3133414c70cbSLiam Girdwood core_initcall(regulator_init); 3134ca725561SMark Brown 3135ca725561SMark Brown static int __init regulator_init_complete(void) 3136ca725561SMark Brown { 3137ca725561SMark Brown struct regulator_dev *rdev; 3138ca725561SMark Brown struct regulator_ops *ops; 3139ca725561SMark Brown struct regulation_constraints *c; 3140ca725561SMark Brown int enabled, ret; 3141ca725561SMark Brown 3142ca725561SMark Brown mutex_lock(®ulator_list_mutex); 3143ca725561SMark Brown 3144ca725561SMark Brown /* If we have a full configuration then disable any regulators 3145ca725561SMark Brown * which are not in use or always_on. This will become the 3146ca725561SMark Brown * default behaviour in the future. 3147ca725561SMark Brown */ 3148ca725561SMark Brown list_for_each_entry(rdev, ®ulator_list, list) { 3149ca725561SMark Brown ops = rdev->desc->ops; 3150ca725561SMark Brown c = rdev->constraints; 3151ca725561SMark Brown 3152f25e0b4fSMark Brown if (!ops->disable || (c && c->always_on)) 3153ca725561SMark Brown continue; 3154ca725561SMark Brown 3155ca725561SMark Brown mutex_lock(&rdev->mutex); 3156ca725561SMark Brown 3157ca725561SMark Brown if (rdev->use_count) 3158ca725561SMark Brown goto unlock; 3159ca725561SMark Brown 3160ca725561SMark Brown /* If we can't read the status assume it's on. */ 3161ca725561SMark Brown if (ops->is_enabled) 3162ca725561SMark Brown enabled = ops->is_enabled(rdev); 3163ca725561SMark Brown else 3164ca725561SMark Brown enabled = 1; 3165ca725561SMark Brown 3166ca725561SMark Brown if (!enabled) 3167ca725561SMark Brown goto unlock; 3168ca725561SMark Brown 3169ca725561SMark Brown if (has_full_constraints) { 3170ca725561SMark Brown /* We log since this may kill the system if it 3171ca725561SMark Brown * goes wrong. */ 31725da84fd9SJoe Perches rdev_info(rdev, "disabling\n"); 3173ca725561SMark Brown ret = ops->disable(rdev); 3174ca725561SMark Brown if (ret != 0) { 31755da84fd9SJoe Perches rdev_err(rdev, "couldn't disable: %d\n", ret); 3176ca725561SMark Brown } 3177ca725561SMark Brown } else { 3178ca725561SMark Brown /* The intention is that in future we will 3179ca725561SMark Brown * assume that full constraints are provided 3180ca725561SMark Brown * so warn even if we aren't going to do 3181ca725561SMark Brown * anything here. 3182ca725561SMark Brown */ 31835da84fd9SJoe Perches rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3184ca725561SMark Brown } 3185ca725561SMark Brown 3186ca725561SMark Brown unlock: 3187ca725561SMark Brown mutex_unlock(&rdev->mutex); 3188ca725561SMark Brown } 3189ca725561SMark Brown 3190ca725561SMark Brown mutex_unlock(®ulator_list_mutex); 3191ca725561SMark Brown 3192ca725561SMark Brown return 0; 3193ca725561SMark Brown } 3194ca725561SMark Brown late_initcall(regulator_init_complete); 3195