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 16c5e28ed7SDaniel Walker #define pr_fmt(fmt) "%s: " fmt, __func__ 17c5e28ed7SDaniel Walker 18414c70cbSLiam Girdwood #include <linux/kernel.h> 19414c70cbSLiam Girdwood #include <linux/init.h> 201130e5b3SMark Brown #include <linux/debugfs.h> 21414c70cbSLiam Girdwood #include <linux/device.h> 225a0e3ad6STejun Heo #include <linux/slab.h> 23f21e0e81SMark Brown #include <linux/async.h> 24414c70cbSLiam Girdwood #include <linux/err.h> 25414c70cbSLiam Girdwood #include <linux/mutex.h> 26414c70cbSLiam Girdwood #include <linux/suspend.h> 2731aae2beSMark Brown #include <linux/delay.h> 2869511a45SRajendra Nayak #include <linux/of.h> 2969511a45SRajendra Nayak #include <linux/regulator/of_regulator.h> 30414c70cbSLiam Girdwood #include <linux/regulator/consumer.h> 31414c70cbSLiam Girdwood #include <linux/regulator/driver.h> 32414c70cbSLiam Girdwood #include <linux/regulator/machine.h> 3365602c32SPaul Gortmaker #include <linux/module.h> 34414c70cbSLiam Girdwood 3502fa3ec0SMark Brown #define CREATE_TRACE_POINTS 3602fa3ec0SMark Brown #include <trace/events/regulator.h> 3702fa3ec0SMark Brown 3834abbd68SMark Brown #include "dummy.h" 3934abbd68SMark Brown 407d51a0dbSMark Brown #define rdev_crit(rdev, fmt, ...) \ 417d51a0dbSMark Brown pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 425da84fd9SJoe Perches #define rdev_err(rdev, fmt, ...) \ 435da84fd9SJoe Perches pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 445da84fd9SJoe Perches #define rdev_warn(rdev, fmt, ...) \ 455da84fd9SJoe Perches pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 465da84fd9SJoe Perches #define rdev_info(rdev, fmt, ...) \ 475da84fd9SJoe Perches pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 485da84fd9SJoe Perches #define rdev_dbg(rdev, fmt, ...) \ 495da84fd9SJoe Perches pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 505da84fd9SJoe Perches 51414c70cbSLiam Girdwood static DEFINE_MUTEX(regulator_list_mutex); 52414c70cbSLiam Girdwood static LIST_HEAD(regulator_list); 53414c70cbSLiam Girdwood static LIST_HEAD(regulator_map_list); 5421cf891aSMark Brown static bool has_full_constraints; 55688fe99aSMark Brown static bool board_wants_dummy_regulator; 56414c70cbSLiam Girdwood 571130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 581130e5b3SMark Brown static struct dentry *debugfs_root; 591130e5b3SMark Brown #endif 601130e5b3SMark Brown 618dc5390dSMark Brown /* 62414c70cbSLiam Girdwood * struct regulator_map 63414c70cbSLiam Girdwood * 64414c70cbSLiam Girdwood * Used to provide symbolic supply names to devices. 65414c70cbSLiam Girdwood */ 66414c70cbSLiam Girdwood struct regulator_map { 67414c70cbSLiam Girdwood struct list_head list; 6840f9244fSMark Brown const char *dev_name; /* The dev_name() for the consumer */ 69414c70cbSLiam Girdwood const char *supply; 70a5766f11SLiam Girdwood struct regulator_dev *regulator; 71414c70cbSLiam Girdwood }; 72414c70cbSLiam Girdwood 73414c70cbSLiam Girdwood /* 74414c70cbSLiam Girdwood * struct regulator 75414c70cbSLiam Girdwood * 76414c70cbSLiam Girdwood * One for each consumer device. 77414c70cbSLiam Girdwood */ 78414c70cbSLiam Girdwood struct regulator { 79414c70cbSLiam Girdwood struct device *dev; 80414c70cbSLiam Girdwood struct list_head list; 81414c70cbSLiam Girdwood int uA_load; 82414c70cbSLiam Girdwood int min_uV; 83414c70cbSLiam Girdwood int max_uV; 84414c70cbSLiam Girdwood char *supply_name; 85414c70cbSLiam Girdwood struct device_attribute dev_attr; 86414c70cbSLiam Girdwood struct regulator_dev *rdev; 875de70519SMark Brown #ifdef CONFIG_DEBUG_FS 885de70519SMark Brown struct dentry *debugfs; 895de70519SMark Brown #endif 90414c70cbSLiam Girdwood }; 91414c70cbSLiam Girdwood 92414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev); 933801b86aSMark Brown static int _regulator_disable(struct regulator_dev *rdev); 94414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev); 95414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev); 96414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 97414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 98414c70cbSLiam Girdwood unsigned long event, void *data); 9975790251SMark Brown static int _regulator_do_set_voltage(struct regulator_dev *rdev, 10075790251SMark Brown int min_uV, int max_uV); 1013801b86aSMark Brown static struct regulator *create_regulator(struct regulator_dev *rdev, 1023801b86aSMark Brown struct device *dev, 1033801b86aSMark Brown const char *supply_name); 104414c70cbSLiam Girdwood 1051083c393SMark Brown static const char *rdev_get_name(struct regulator_dev *rdev) 1061083c393SMark Brown { 1071083c393SMark Brown if (rdev->constraints && rdev->constraints->name) 1081083c393SMark Brown return rdev->constraints->name; 1091083c393SMark Brown else if (rdev->desc->name) 1101083c393SMark Brown return rdev->desc->name; 1111083c393SMark Brown else 1121083c393SMark Brown return ""; 1131083c393SMark Brown } 1141083c393SMark Brown 115414c70cbSLiam Girdwood /* gets the regulator for a given consumer device */ 116414c70cbSLiam Girdwood static struct regulator *get_device_regulator(struct device *dev) 117414c70cbSLiam Girdwood { 118414c70cbSLiam Girdwood struct regulator *regulator = NULL; 119414c70cbSLiam Girdwood struct regulator_dev *rdev; 120414c70cbSLiam Girdwood 121414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 122414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 123414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 124414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) { 125414c70cbSLiam Girdwood if (regulator->dev == dev) { 126414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 127414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 128414c70cbSLiam Girdwood return regulator; 129414c70cbSLiam Girdwood } 130414c70cbSLiam Girdwood } 131414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 132414c70cbSLiam Girdwood } 133414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 134414c70cbSLiam Girdwood return NULL; 135414c70cbSLiam Girdwood } 136414c70cbSLiam Girdwood 13769511a45SRajendra Nayak /** 13869511a45SRajendra Nayak * of_get_regulator - get a regulator device node based on supply name 13969511a45SRajendra Nayak * @dev: Device pointer for the consumer (of regulator) device 14069511a45SRajendra Nayak * @supply: regulator supply name 14169511a45SRajendra Nayak * 14269511a45SRajendra Nayak * Extract the regulator device node corresponding to the supply name. 14369511a45SRajendra Nayak * retruns the device node corresponding to the regulator if found, else 14469511a45SRajendra Nayak * returns NULL. 14569511a45SRajendra Nayak */ 14669511a45SRajendra Nayak static struct device_node *of_get_regulator(struct device *dev, const char *supply) 14769511a45SRajendra Nayak { 14869511a45SRajendra Nayak struct device_node *regnode = NULL; 14969511a45SRajendra Nayak char prop_name[32]; /* 32 is max size of property name */ 15069511a45SRajendra Nayak 15169511a45SRajendra Nayak dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); 15269511a45SRajendra Nayak 15369511a45SRajendra Nayak snprintf(prop_name, 32, "%s-supply", supply); 15469511a45SRajendra Nayak regnode = of_parse_phandle(dev->of_node, prop_name, 0); 15569511a45SRajendra Nayak 15669511a45SRajendra Nayak if (!regnode) { 15769511a45SRajendra Nayak dev_warn(dev, "%s property in node %s references invalid phandle", 15869511a45SRajendra Nayak prop_name, dev->of_node->full_name); 15969511a45SRajendra Nayak return NULL; 16069511a45SRajendra Nayak } 16169511a45SRajendra Nayak return regnode; 16269511a45SRajendra Nayak } 16369511a45SRajendra Nayak 164414c70cbSLiam Girdwood /* Platform voltage constraint check */ 165414c70cbSLiam Girdwood static int regulator_check_voltage(struct regulator_dev *rdev, 166414c70cbSLiam Girdwood int *min_uV, int *max_uV) 167414c70cbSLiam Girdwood { 168414c70cbSLiam Girdwood BUG_ON(*min_uV > *max_uV); 169414c70cbSLiam Girdwood 170414c70cbSLiam Girdwood if (!rdev->constraints) { 1715da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 172414c70cbSLiam Girdwood return -ENODEV; 173414c70cbSLiam Girdwood } 174414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 1755da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 176414c70cbSLiam Girdwood return -EPERM; 177414c70cbSLiam Girdwood } 178414c70cbSLiam Girdwood 179414c70cbSLiam Girdwood if (*max_uV > rdev->constraints->max_uV) 180414c70cbSLiam Girdwood *max_uV = rdev->constraints->max_uV; 181414c70cbSLiam Girdwood if (*min_uV < rdev->constraints->min_uV) 182414c70cbSLiam Girdwood *min_uV = rdev->constraints->min_uV; 183414c70cbSLiam Girdwood 18489f425edSMark Brown if (*min_uV > *max_uV) { 18589f425edSMark Brown rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 18654abd335SMark Brown *min_uV, *max_uV); 187414c70cbSLiam Girdwood return -EINVAL; 18889f425edSMark Brown } 189414c70cbSLiam Girdwood 190414c70cbSLiam Girdwood return 0; 191414c70cbSLiam Girdwood } 192414c70cbSLiam Girdwood 19305fda3b1SThomas Petazzoni /* Make sure we select a voltage that suits the needs of all 19405fda3b1SThomas Petazzoni * regulator consumers 19505fda3b1SThomas Petazzoni */ 19605fda3b1SThomas Petazzoni static int regulator_check_consumers(struct regulator_dev *rdev, 19705fda3b1SThomas Petazzoni int *min_uV, int *max_uV) 19805fda3b1SThomas Petazzoni { 19905fda3b1SThomas Petazzoni struct regulator *regulator; 20005fda3b1SThomas Petazzoni 20105fda3b1SThomas Petazzoni list_for_each_entry(regulator, &rdev->consumer_list, list) { 2024aa922c0SMark Brown /* 2034aa922c0SMark Brown * Assume consumers that didn't say anything are OK 2044aa922c0SMark Brown * with anything in the constraint range. 2054aa922c0SMark Brown */ 2064aa922c0SMark Brown if (!regulator->min_uV && !regulator->max_uV) 2074aa922c0SMark Brown continue; 2084aa922c0SMark Brown 20905fda3b1SThomas Petazzoni if (*max_uV > regulator->max_uV) 21005fda3b1SThomas Petazzoni *max_uV = regulator->max_uV; 21105fda3b1SThomas Petazzoni if (*min_uV < regulator->min_uV) 21205fda3b1SThomas Petazzoni *min_uV = regulator->min_uV; 21305fda3b1SThomas Petazzoni } 21405fda3b1SThomas Petazzoni 21505fda3b1SThomas Petazzoni if (*min_uV > *max_uV) 21605fda3b1SThomas Petazzoni return -EINVAL; 21705fda3b1SThomas Petazzoni 21805fda3b1SThomas Petazzoni return 0; 21905fda3b1SThomas Petazzoni } 22005fda3b1SThomas Petazzoni 221414c70cbSLiam Girdwood /* current constraint check */ 222414c70cbSLiam Girdwood static int regulator_check_current_limit(struct regulator_dev *rdev, 223414c70cbSLiam Girdwood int *min_uA, int *max_uA) 224414c70cbSLiam Girdwood { 225414c70cbSLiam Girdwood BUG_ON(*min_uA > *max_uA); 226414c70cbSLiam Girdwood 227414c70cbSLiam Girdwood if (!rdev->constraints) { 2285da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 229414c70cbSLiam Girdwood return -ENODEV; 230414c70cbSLiam Girdwood } 231414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 2325da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 233414c70cbSLiam Girdwood return -EPERM; 234414c70cbSLiam Girdwood } 235414c70cbSLiam Girdwood 236414c70cbSLiam Girdwood if (*max_uA > rdev->constraints->max_uA) 237414c70cbSLiam Girdwood *max_uA = rdev->constraints->max_uA; 238414c70cbSLiam Girdwood if (*min_uA < rdev->constraints->min_uA) 239414c70cbSLiam Girdwood *min_uA = rdev->constraints->min_uA; 240414c70cbSLiam Girdwood 24189f425edSMark Brown if (*min_uA > *max_uA) { 24289f425edSMark Brown rdev_err(rdev, "unsupportable current range: %d-%duA\n", 24354abd335SMark Brown *min_uA, *max_uA); 244414c70cbSLiam Girdwood return -EINVAL; 24589f425edSMark Brown } 246414c70cbSLiam Girdwood 247414c70cbSLiam Girdwood return 0; 248414c70cbSLiam Girdwood } 249414c70cbSLiam Girdwood 250414c70cbSLiam Girdwood /* operating mode constraint check */ 2512c608234SMark Brown static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 252414c70cbSLiam Girdwood { 2532c608234SMark Brown switch (*mode) { 254e573520bSDavid Brownell case REGULATOR_MODE_FAST: 255e573520bSDavid Brownell case REGULATOR_MODE_NORMAL: 256e573520bSDavid Brownell case REGULATOR_MODE_IDLE: 257e573520bSDavid Brownell case REGULATOR_MODE_STANDBY: 258e573520bSDavid Brownell break; 259e573520bSDavid Brownell default: 26089f425edSMark Brown rdev_err(rdev, "invalid mode %x specified\n", *mode); 261e573520bSDavid Brownell return -EINVAL; 262e573520bSDavid Brownell } 263e573520bSDavid Brownell 264414c70cbSLiam Girdwood if (!rdev->constraints) { 2655da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 266414c70cbSLiam Girdwood return -ENODEV; 267414c70cbSLiam Girdwood } 268414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 2695da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 270414c70cbSLiam Girdwood return -EPERM; 271414c70cbSLiam Girdwood } 2722c608234SMark Brown 2732c608234SMark Brown /* The modes are bitmasks, the most power hungry modes having 2742c608234SMark Brown * the lowest values. If the requested mode isn't supported 2752c608234SMark Brown * try higher modes. */ 2762c608234SMark Brown while (*mode) { 2772c608234SMark Brown if (rdev->constraints->valid_modes_mask & *mode) 278414c70cbSLiam Girdwood return 0; 2792c608234SMark Brown *mode /= 2; 2802c608234SMark Brown } 2812c608234SMark Brown 2822c608234SMark Brown return -EINVAL; 283414c70cbSLiam Girdwood } 284414c70cbSLiam Girdwood 285414c70cbSLiam Girdwood /* dynamic regulator mode switching constraint check */ 286414c70cbSLiam Girdwood static int regulator_check_drms(struct regulator_dev *rdev) 287414c70cbSLiam Girdwood { 288414c70cbSLiam Girdwood if (!rdev->constraints) { 2895da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 290414c70cbSLiam Girdwood return -ENODEV; 291414c70cbSLiam Girdwood } 292414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 2935da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 294414c70cbSLiam Girdwood return -EPERM; 295414c70cbSLiam Girdwood } 296414c70cbSLiam Girdwood return 0; 297414c70cbSLiam Girdwood } 298414c70cbSLiam Girdwood 299414c70cbSLiam Girdwood static ssize_t device_requested_uA_show(struct device *dev, 300414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 301414c70cbSLiam Girdwood { 302414c70cbSLiam Girdwood struct regulator *regulator; 303414c70cbSLiam Girdwood 304414c70cbSLiam Girdwood regulator = get_device_regulator(dev); 305414c70cbSLiam Girdwood if (regulator == NULL) 306414c70cbSLiam Girdwood return 0; 307414c70cbSLiam Girdwood 308414c70cbSLiam Girdwood return sprintf(buf, "%d\n", regulator->uA_load); 309414c70cbSLiam Girdwood } 310414c70cbSLiam Girdwood 311414c70cbSLiam Girdwood static ssize_t regulator_uV_show(struct device *dev, 312414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 313414c70cbSLiam Girdwood { 314a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 315414c70cbSLiam Girdwood ssize_t ret; 316414c70cbSLiam Girdwood 317414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 318414c70cbSLiam Girdwood ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 319414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 320414c70cbSLiam Girdwood 321414c70cbSLiam Girdwood return ret; 322414c70cbSLiam Girdwood } 3237ad68e2fSDavid Brownell static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 324414c70cbSLiam Girdwood 325414c70cbSLiam Girdwood static ssize_t regulator_uA_show(struct device *dev, 326414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 327414c70cbSLiam Girdwood { 328a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 329414c70cbSLiam Girdwood 330414c70cbSLiam Girdwood return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 331414c70cbSLiam Girdwood } 3327ad68e2fSDavid Brownell static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 333414c70cbSLiam Girdwood 334bc558a60SMark Brown static ssize_t regulator_name_show(struct device *dev, 335bc558a60SMark Brown struct device_attribute *attr, char *buf) 336bc558a60SMark Brown { 337bc558a60SMark Brown struct regulator_dev *rdev = dev_get_drvdata(dev); 338bc558a60SMark Brown 3391083c393SMark Brown return sprintf(buf, "%s\n", rdev_get_name(rdev)); 340bc558a60SMark Brown } 341bc558a60SMark Brown 3424fca9545SDavid Brownell static ssize_t regulator_print_opmode(char *buf, int mode) 343414c70cbSLiam Girdwood { 344414c70cbSLiam Girdwood switch (mode) { 345414c70cbSLiam Girdwood case REGULATOR_MODE_FAST: 346414c70cbSLiam Girdwood return sprintf(buf, "fast\n"); 347414c70cbSLiam Girdwood case REGULATOR_MODE_NORMAL: 348414c70cbSLiam Girdwood return sprintf(buf, "normal\n"); 349414c70cbSLiam Girdwood case REGULATOR_MODE_IDLE: 350414c70cbSLiam Girdwood return sprintf(buf, "idle\n"); 351414c70cbSLiam Girdwood case REGULATOR_MODE_STANDBY: 352414c70cbSLiam Girdwood return sprintf(buf, "standby\n"); 353414c70cbSLiam Girdwood } 354414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 355414c70cbSLiam Girdwood } 356414c70cbSLiam Girdwood 3574fca9545SDavid Brownell static ssize_t regulator_opmode_show(struct device *dev, 358414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 359414c70cbSLiam Girdwood { 360a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 361414c70cbSLiam Girdwood 3624fca9545SDavid Brownell return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 3634fca9545SDavid Brownell } 3647ad68e2fSDavid Brownell static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 3654fca9545SDavid Brownell 3664fca9545SDavid Brownell static ssize_t regulator_print_state(char *buf, int state) 3674fca9545SDavid Brownell { 368414c70cbSLiam Girdwood if (state > 0) 369414c70cbSLiam Girdwood return sprintf(buf, "enabled\n"); 370414c70cbSLiam Girdwood else if (state == 0) 371414c70cbSLiam Girdwood return sprintf(buf, "disabled\n"); 372414c70cbSLiam Girdwood else 373414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 374414c70cbSLiam Girdwood } 375414c70cbSLiam Girdwood 3764fca9545SDavid Brownell static ssize_t regulator_state_show(struct device *dev, 3774fca9545SDavid Brownell struct device_attribute *attr, char *buf) 3784fca9545SDavid Brownell { 3794fca9545SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 3809332546fSMark Brown ssize_t ret; 3814fca9545SDavid Brownell 3829332546fSMark Brown mutex_lock(&rdev->mutex); 3839332546fSMark Brown ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 3849332546fSMark Brown mutex_unlock(&rdev->mutex); 3859332546fSMark Brown 3869332546fSMark Brown return ret; 3874fca9545SDavid Brownell } 3887ad68e2fSDavid Brownell static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 3894fca9545SDavid Brownell 390853116a1SDavid Brownell static ssize_t regulator_status_show(struct device *dev, 391853116a1SDavid Brownell struct device_attribute *attr, char *buf) 392853116a1SDavid Brownell { 393853116a1SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 394853116a1SDavid Brownell int status; 395853116a1SDavid Brownell char *label; 396853116a1SDavid Brownell 397853116a1SDavid Brownell status = rdev->desc->ops->get_status(rdev); 398853116a1SDavid Brownell if (status < 0) 399853116a1SDavid Brownell return status; 400853116a1SDavid Brownell 401853116a1SDavid Brownell switch (status) { 402853116a1SDavid Brownell case REGULATOR_STATUS_OFF: 403853116a1SDavid Brownell label = "off"; 404853116a1SDavid Brownell break; 405853116a1SDavid Brownell case REGULATOR_STATUS_ON: 406853116a1SDavid Brownell label = "on"; 407853116a1SDavid Brownell break; 408853116a1SDavid Brownell case REGULATOR_STATUS_ERROR: 409853116a1SDavid Brownell label = "error"; 410853116a1SDavid Brownell break; 411853116a1SDavid Brownell case REGULATOR_STATUS_FAST: 412853116a1SDavid Brownell label = "fast"; 413853116a1SDavid Brownell break; 414853116a1SDavid Brownell case REGULATOR_STATUS_NORMAL: 415853116a1SDavid Brownell label = "normal"; 416853116a1SDavid Brownell break; 417853116a1SDavid Brownell case REGULATOR_STATUS_IDLE: 418853116a1SDavid Brownell label = "idle"; 419853116a1SDavid Brownell break; 420853116a1SDavid Brownell case REGULATOR_STATUS_STANDBY: 421853116a1SDavid Brownell label = "standby"; 422853116a1SDavid Brownell break; 423853116a1SDavid Brownell default: 424853116a1SDavid Brownell return -ERANGE; 425853116a1SDavid Brownell } 426853116a1SDavid Brownell 427853116a1SDavid Brownell return sprintf(buf, "%s\n", label); 428853116a1SDavid Brownell } 429853116a1SDavid Brownell static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 430853116a1SDavid Brownell 431414c70cbSLiam Girdwood static ssize_t regulator_min_uA_show(struct device *dev, 432414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 433414c70cbSLiam Girdwood { 434a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 435414c70cbSLiam Girdwood 436414c70cbSLiam Girdwood if (!rdev->constraints) 437414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 438414c70cbSLiam Girdwood 439414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uA); 440414c70cbSLiam Girdwood } 4417ad68e2fSDavid Brownell static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 442414c70cbSLiam Girdwood 443414c70cbSLiam Girdwood static ssize_t regulator_max_uA_show(struct device *dev, 444414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 445414c70cbSLiam Girdwood { 446a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 447414c70cbSLiam Girdwood 448414c70cbSLiam Girdwood if (!rdev->constraints) 449414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 450414c70cbSLiam Girdwood 451414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uA); 452414c70cbSLiam Girdwood } 4537ad68e2fSDavid Brownell static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 454414c70cbSLiam Girdwood 455414c70cbSLiam Girdwood static ssize_t regulator_min_uV_show(struct device *dev, 456414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 457414c70cbSLiam Girdwood { 458a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 459414c70cbSLiam Girdwood 460414c70cbSLiam Girdwood if (!rdev->constraints) 461414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 462414c70cbSLiam Girdwood 463414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uV); 464414c70cbSLiam Girdwood } 4657ad68e2fSDavid Brownell static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 466414c70cbSLiam Girdwood 467414c70cbSLiam Girdwood static ssize_t regulator_max_uV_show(struct device *dev, 468414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 469414c70cbSLiam Girdwood { 470a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 471414c70cbSLiam Girdwood 472414c70cbSLiam Girdwood if (!rdev->constraints) 473414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 474414c70cbSLiam Girdwood 475414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uV); 476414c70cbSLiam Girdwood } 4777ad68e2fSDavid Brownell static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 478414c70cbSLiam Girdwood 479414c70cbSLiam Girdwood static ssize_t regulator_total_uA_show(struct device *dev, 480414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 481414c70cbSLiam Girdwood { 482a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 483414c70cbSLiam Girdwood struct regulator *regulator; 484414c70cbSLiam Girdwood int uA = 0; 485414c70cbSLiam Girdwood 486414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 487414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) 488414c70cbSLiam Girdwood uA += regulator->uA_load; 489414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 490414c70cbSLiam Girdwood return sprintf(buf, "%d\n", uA); 491414c70cbSLiam Girdwood } 4927ad68e2fSDavid Brownell static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 493414c70cbSLiam Girdwood 494414c70cbSLiam Girdwood static ssize_t regulator_num_users_show(struct device *dev, 495414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 496414c70cbSLiam Girdwood { 497a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 498414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->use_count); 499414c70cbSLiam Girdwood } 500414c70cbSLiam Girdwood 501414c70cbSLiam Girdwood static ssize_t regulator_type_show(struct device *dev, 502414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 503414c70cbSLiam Girdwood { 504a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 505414c70cbSLiam Girdwood 506414c70cbSLiam Girdwood switch (rdev->desc->type) { 507414c70cbSLiam Girdwood case REGULATOR_VOLTAGE: 508414c70cbSLiam Girdwood return sprintf(buf, "voltage\n"); 509414c70cbSLiam Girdwood case REGULATOR_CURRENT: 510414c70cbSLiam Girdwood return sprintf(buf, "current\n"); 511414c70cbSLiam Girdwood } 512414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 513414c70cbSLiam Girdwood } 514414c70cbSLiam Girdwood 515414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 516414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 517414c70cbSLiam Girdwood { 518a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 519414c70cbSLiam Girdwood 520414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 521414c70cbSLiam Girdwood } 5227ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_microvolts, 0444, 5237ad68e2fSDavid Brownell regulator_suspend_mem_uV_show, NULL); 524414c70cbSLiam Girdwood 525414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 526414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 527414c70cbSLiam Girdwood { 528a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 529414c70cbSLiam Girdwood 530414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 531414c70cbSLiam Girdwood } 5327ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_microvolts, 0444, 5337ad68e2fSDavid Brownell regulator_suspend_disk_uV_show, NULL); 534414c70cbSLiam Girdwood 535414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 536414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 537414c70cbSLiam Girdwood { 538a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 539414c70cbSLiam Girdwood 540414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 541414c70cbSLiam Girdwood } 5427ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_microvolts, 0444, 5437ad68e2fSDavid Brownell regulator_suspend_standby_uV_show, NULL); 544414c70cbSLiam Girdwood 545414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 546414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 547414c70cbSLiam Girdwood { 548a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 549414c70cbSLiam Girdwood 5504fca9545SDavid Brownell return regulator_print_opmode(buf, 5514fca9545SDavid Brownell rdev->constraints->state_mem.mode); 552414c70cbSLiam Girdwood } 5537ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_mode, 0444, 5547ad68e2fSDavid Brownell regulator_suspend_mem_mode_show, NULL); 555414c70cbSLiam Girdwood 556414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 557414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 558414c70cbSLiam Girdwood { 559a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 560414c70cbSLiam Girdwood 5614fca9545SDavid Brownell return regulator_print_opmode(buf, 5624fca9545SDavid Brownell rdev->constraints->state_disk.mode); 563414c70cbSLiam Girdwood } 5647ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_mode, 0444, 5657ad68e2fSDavid Brownell regulator_suspend_disk_mode_show, NULL); 566414c70cbSLiam Girdwood 567414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 568414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 569414c70cbSLiam Girdwood { 570a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 571414c70cbSLiam Girdwood 5724fca9545SDavid Brownell return regulator_print_opmode(buf, 5734fca9545SDavid Brownell rdev->constraints->state_standby.mode); 574414c70cbSLiam Girdwood } 5757ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_mode, 0444, 5767ad68e2fSDavid Brownell regulator_suspend_standby_mode_show, NULL); 577414c70cbSLiam Girdwood 578414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_state_show(struct device *dev, 579414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 580414c70cbSLiam Girdwood { 581a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 582414c70cbSLiam Girdwood 5834fca9545SDavid Brownell return regulator_print_state(buf, 5844fca9545SDavid Brownell rdev->constraints->state_mem.enabled); 585414c70cbSLiam Girdwood } 5867ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_state, 0444, 5877ad68e2fSDavid Brownell regulator_suspend_mem_state_show, NULL); 588414c70cbSLiam Girdwood 589414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_state_show(struct device *dev, 590414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 591414c70cbSLiam Girdwood { 592a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 593414c70cbSLiam Girdwood 5944fca9545SDavid Brownell return regulator_print_state(buf, 5954fca9545SDavid Brownell rdev->constraints->state_disk.enabled); 596414c70cbSLiam Girdwood } 5977ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_state, 0444, 5987ad68e2fSDavid Brownell regulator_suspend_disk_state_show, NULL); 599414c70cbSLiam Girdwood 600414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_state_show(struct device *dev, 601414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 602414c70cbSLiam Girdwood { 603a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 604414c70cbSLiam Girdwood 6054fca9545SDavid Brownell return regulator_print_state(buf, 6064fca9545SDavid Brownell rdev->constraints->state_standby.enabled); 607414c70cbSLiam Girdwood } 6087ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_state, 0444, 6097ad68e2fSDavid Brownell regulator_suspend_standby_state_show, NULL); 610bc558a60SMark Brown 6117ad68e2fSDavid Brownell 6127ad68e2fSDavid Brownell /* 6137ad68e2fSDavid Brownell * These are the only attributes are present for all regulators. 6147ad68e2fSDavid Brownell * Other attributes are a function of regulator functionality. 6157ad68e2fSDavid Brownell */ 616414c70cbSLiam Girdwood static struct device_attribute regulator_dev_attrs[] = { 617bc558a60SMark Brown __ATTR(name, 0444, regulator_name_show, NULL), 618414c70cbSLiam Girdwood __ATTR(num_users, 0444, regulator_num_users_show, NULL), 619414c70cbSLiam Girdwood __ATTR(type, 0444, regulator_type_show, NULL), 620414c70cbSLiam Girdwood __ATTR_NULL, 621414c70cbSLiam Girdwood }; 622414c70cbSLiam Girdwood 623414c70cbSLiam Girdwood static void regulator_dev_release(struct device *dev) 624414c70cbSLiam Girdwood { 625a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 626414c70cbSLiam Girdwood kfree(rdev); 627414c70cbSLiam Girdwood } 628414c70cbSLiam Girdwood 629414c70cbSLiam Girdwood static struct class regulator_class = { 630414c70cbSLiam Girdwood .name = "regulator", 631414c70cbSLiam Girdwood .dev_release = regulator_dev_release, 632414c70cbSLiam Girdwood .dev_attrs = regulator_dev_attrs, 633414c70cbSLiam Girdwood }; 634414c70cbSLiam Girdwood 635414c70cbSLiam Girdwood /* Calculate the new optimum regulator operating mode based on the new total 636414c70cbSLiam Girdwood * consumer load. All locks held by caller */ 637414c70cbSLiam Girdwood static void drms_uA_update(struct regulator_dev *rdev) 638414c70cbSLiam Girdwood { 639414c70cbSLiam Girdwood struct regulator *sibling; 640414c70cbSLiam Girdwood int current_uA = 0, output_uV, input_uV, err; 641414c70cbSLiam Girdwood unsigned int mode; 642414c70cbSLiam Girdwood 643414c70cbSLiam Girdwood err = regulator_check_drms(rdev); 644414c70cbSLiam Girdwood if (err < 0 || !rdev->desc->ops->get_optimum_mode || 645476c2d83SMark Brown (!rdev->desc->ops->get_voltage && 646476c2d83SMark Brown !rdev->desc->ops->get_voltage_sel) || 647476c2d83SMark Brown !rdev->desc->ops->set_mode) 648414c70cbSLiam Girdwood return; 649414c70cbSLiam Girdwood 650414c70cbSLiam Girdwood /* get output voltage */ 6511bf5a1f8SMark Brown output_uV = _regulator_get_voltage(rdev); 652414c70cbSLiam Girdwood if (output_uV <= 0) 653414c70cbSLiam Girdwood return; 654414c70cbSLiam Girdwood 655414c70cbSLiam Girdwood /* get input voltage */ 6561bf5a1f8SMark Brown input_uV = 0; 6571bf5a1f8SMark Brown if (rdev->supply) 6581bf5a1f8SMark Brown input_uV = _regulator_get_voltage(rdev); 6591bf5a1f8SMark Brown if (input_uV <= 0) 660414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 661414c70cbSLiam Girdwood if (input_uV <= 0) 662414c70cbSLiam Girdwood return; 663414c70cbSLiam Girdwood 664414c70cbSLiam Girdwood /* calc total requested load */ 665414c70cbSLiam Girdwood list_for_each_entry(sibling, &rdev->consumer_list, list) 666414c70cbSLiam Girdwood current_uA += sibling->uA_load; 667414c70cbSLiam Girdwood 668414c70cbSLiam Girdwood /* now get the optimum mode for our new total regulator load */ 669414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 670414c70cbSLiam Girdwood output_uV, current_uA); 671414c70cbSLiam Girdwood 672414c70cbSLiam Girdwood /* check the new mode is allowed */ 6732c608234SMark Brown err = regulator_mode_constrain(rdev, &mode); 674414c70cbSLiam Girdwood if (err == 0) 675414c70cbSLiam Girdwood rdev->desc->ops->set_mode(rdev, mode); 676414c70cbSLiam Girdwood } 677414c70cbSLiam Girdwood 678414c70cbSLiam Girdwood static int suspend_set_state(struct regulator_dev *rdev, 679414c70cbSLiam Girdwood struct regulator_state *rstate) 680414c70cbSLiam Girdwood { 681414c70cbSLiam Girdwood int ret = 0; 682638f85c5SMark Brown bool can_set_state; 683414c70cbSLiam Girdwood 684638f85c5SMark Brown can_set_state = rdev->desc->ops->set_suspend_enable && 685638f85c5SMark Brown rdev->desc->ops->set_suspend_disable; 686638f85c5SMark Brown 687638f85c5SMark Brown /* If we have no suspend mode configration don't set anything; 688638f85c5SMark Brown * only warn if the driver actually makes the suspend mode 689638f85c5SMark Brown * configurable. 690638f85c5SMark Brown */ 691638f85c5SMark Brown if (!rstate->enabled && !rstate->disabled) { 692638f85c5SMark Brown if (can_set_state) 6935da84fd9SJoe Perches rdev_warn(rdev, "No configuration\n"); 694638f85c5SMark Brown return 0; 695638f85c5SMark Brown } 696638f85c5SMark Brown 697638f85c5SMark Brown if (rstate->enabled && rstate->disabled) { 6985da84fd9SJoe Perches rdev_err(rdev, "invalid configuration\n"); 699638f85c5SMark Brown return -EINVAL; 700638f85c5SMark Brown } 701638f85c5SMark Brown 702638f85c5SMark Brown if (!can_set_state) { 7035da84fd9SJoe Perches rdev_err(rdev, "no way to set suspend state\n"); 704414c70cbSLiam Girdwood return -EINVAL; 705a5766f11SLiam Girdwood } 706414c70cbSLiam Girdwood 707414c70cbSLiam Girdwood if (rstate->enabled) 708414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_enable(rdev); 709414c70cbSLiam Girdwood else 710414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_disable(rdev); 711414c70cbSLiam Girdwood if (ret < 0) { 7125da84fd9SJoe Perches rdev_err(rdev, "failed to enabled/disable\n"); 713414c70cbSLiam Girdwood return ret; 714414c70cbSLiam Girdwood } 715414c70cbSLiam Girdwood 716414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 717414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 718414c70cbSLiam Girdwood if (ret < 0) { 7195da84fd9SJoe Perches rdev_err(rdev, "failed to set voltage\n"); 720414c70cbSLiam Girdwood return ret; 721414c70cbSLiam Girdwood } 722414c70cbSLiam Girdwood } 723414c70cbSLiam Girdwood 724414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 725414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 726414c70cbSLiam Girdwood if (ret < 0) { 7275da84fd9SJoe Perches rdev_err(rdev, "failed to set mode\n"); 728414c70cbSLiam Girdwood return ret; 729414c70cbSLiam Girdwood } 730414c70cbSLiam Girdwood } 731414c70cbSLiam Girdwood return ret; 732414c70cbSLiam Girdwood } 733414c70cbSLiam Girdwood 734414c70cbSLiam Girdwood /* locks held by caller */ 735414c70cbSLiam Girdwood static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 736414c70cbSLiam Girdwood { 737414c70cbSLiam Girdwood if (!rdev->constraints) 738414c70cbSLiam Girdwood return -EINVAL; 739414c70cbSLiam Girdwood 740414c70cbSLiam Girdwood switch (state) { 741414c70cbSLiam Girdwood case PM_SUSPEND_STANDBY: 742414c70cbSLiam Girdwood return suspend_set_state(rdev, 743414c70cbSLiam Girdwood &rdev->constraints->state_standby); 744414c70cbSLiam Girdwood case PM_SUSPEND_MEM: 745414c70cbSLiam Girdwood return suspend_set_state(rdev, 746414c70cbSLiam Girdwood &rdev->constraints->state_mem); 747414c70cbSLiam Girdwood case PM_SUSPEND_MAX: 748414c70cbSLiam Girdwood return suspend_set_state(rdev, 749414c70cbSLiam Girdwood &rdev->constraints->state_disk); 750414c70cbSLiam Girdwood default: 751414c70cbSLiam Girdwood return -EINVAL; 752414c70cbSLiam Girdwood } 753414c70cbSLiam Girdwood } 754414c70cbSLiam Girdwood 755414c70cbSLiam Girdwood static void print_constraints(struct regulator_dev *rdev) 756414c70cbSLiam Girdwood { 757414c70cbSLiam Girdwood struct regulation_constraints *constraints = rdev->constraints; 758973e9a27SMark Brown char buf[80] = ""; 7598f031b48SMark Brown int count = 0; 7608f031b48SMark Brown int ret; 761414c70cbSLiam Girdwood 7628f031b48SMark Brown if (constraints->min_uV && constraints->max_uV) { 763414c70cbSLiam Girdwood if (constraints->min_uV == constraints->max_uV) 7648f031b48SMark Brown count += sprintf(buf + count, "%d mV ", 765414c70cbSLiam Girdwood constraints->min_uV / 1000); 766414c70cbSLiam Girdwood else 7678f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mV ", 768414c70cbSLiam Girdwood constraints->min_uV / 1000, 769414c70cbSLiam Girdwood constraints->max_uV / 1000); 7708f031b48SMark Brown } 7718f031b48SMark Brown 7728f031b48SMark Brown if (!constraints->min_uV || 7738f031b48SMark Brown constraints->min_uV != constraints->max_uV) { 7748f031b48SMark Brown ret = _regulator_get_voltage(rdev); 7758f031b48SMark Brown if (ret > 0) 7768f031b48SMark Brown count += sprintf(buf + count, "at %d mV ", ret / 1000); 7778f031b48SMark Brown } 7788f031b48SMark Brown 779bf5892a8SMark Brown if (constraints->uV_offset) 780bf5892a8SMark Brown count += sprintf(buf, "%dmV offset ", 781bf5892a8SMark Brown constraints->uV_offset / 1000); 782bf5892a8SMark Brown 7838f031b48SMark Brown if (constraints->min_uA && constraints->max_uA) { 784414c70cbSLiam Girdwood if (constraints->min_uA == constraints->max_uA) 7858f031b48SMark Brown count += sprintf(buf + count, "%d mA ", 786414c70cbSLiam Girdwood constraints->min_uA / 1000); 787414c70cbSLiam Girdwood else 7888f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mA ", 789414c70cbSLiam Girdwood constraints->min_uA / 1000, 790414c70cbSLiam Girdwood constraints->max_uA / 1000); 791414c70cbSLiam Girdwood } 7928f031b48SMark Brown 7938f031b48SMark Brown if (!constraints->min_uA || 7948f031b48SMark Brown constraints->min_uA != constraints->max_uA) { 7958f031b48SMark Brown ret = _regulator_get_current_limit(rdev); 7968f031b48SMark Brown if (ret > 0) 797e4a6376bSCyril Chemparathy count += sprintf(buf + count, "at %d mA ", ret / 1000); 7988f031b48SMark Brown } 7998f031b48SMark Brown 800414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 801414c70cbSLiam Girdwood count += sprintf(buf + count, "fast "); 802414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 803414c70cbSLiam Girdwood count += sprintf(buf + count, "normal "); 804414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 805414c70cbSLiam Girdwood count += sprintf(buf + count, "idle "); 806414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 807414c70cbSLiam Girdwood count += sprintf(buf + count, "standby"); 808414c70cbSLiam Girdwood 80913ce29f8SMark Brown rdev_info(rdev, "%s\n", buf); 810414c70cbSLiam Girdwood } 811414c70cbSLiam Girdwood 812e79055d6SMark Brown static int machine_constraints_voltage(struct regulator_dev *rdev, 8131083c393SMark Brown struct regulation_constraints *constraints) 814e79055d6SMark Brown { 815e79055d6SMark Brown struct regulator_ops *ops = rdev->desc->ops; 816af5866c9SMark Brown int ret; 817af5866c9SMark Brown 818af5866c9SMark Brown /* do we need to apply the constraint voltage */ 819af5866c9SMark Brown if (rdev->constraints->apply_uV && 82075790251SMark Brown rdev->constraints->min_uV == rdev->constraints->max_uV) { 82175790251SMark Brown ret = _regulator_do_set_voltage(rdev, 8223a93f2a9SMark Brown rdev->constraints->min_uV, 82375790251SMark Brown rdev->constraints->max_uV); 824af5866c9SMark Brown if (ret < 0) { 8255da84fd9SJoe Perches rdev_err(rdev, "failed to apply %duV constraint\n", 8265da84fd9SJoe Perches rdev->constraints->min_uV); 827af5866c9SMark Brown return ret; 828af5866c9SMark Brown } 829af5866c9SMark Brown } 830e79055d6SMark Brown 831e79055d6SMark Brown /* constrain machine-level voltage specs to fit 832e79055d6SMark Brown * the actual range supported by this regulator. 833e79055d6SMark Brown */ 834e79055d6SMark Brown if (ops->list_voltage && rdev->desc->n_voltages) { 835e79055d6SMark Brown int count = rdev->desc->n_voltages; 836e79055d6SMark Brown int i; 837e79055d6SMark Brown int min_uV = INT_MAX; 838e79055d6SMark Brown int max_uV = INT_MIN; 839e79055d6SMark Brown int cmin = constraints->min_uV; 840e79055d6SMark Brown int cmax = constraints->max_uV; 841e79055d6SMark Brown 842e79055d6SMark Brown /* it's safe to autoconfigure fixed-voltage supplies 843e79055d6SMark Brown and the constraints are used by list_voltage. */ 844e79055d6SMark Brown if (count == 1 && !cmin) { 845e79055d6SMark Brown cmin = 1; 846e79055d6SMark Brown cmax = INT_MAX; 847e79055d6SMark Brown constraints->min_uV = cmin; 848e79055d6SMark Brown constraints->max_uV = cmax; 849e79055d6SMark Brown } 850e79055d6SMark Brown 851e79055d6SMark Brown /* voltage constraints are optional */ 852e79055d6SMark Brown if ((cmin == 0) && (cmax == 0)) 853e79055d6SMark Brown return 0; 854e79055d6SMark Brown 855e79055d6SMark Brown /* else require explicit machine-level constraints */ 856e79055d6SMark Brown if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 8575da84fd9SJoe Perches rdev_err(rdev, "invalid voltage constraints\n"); 858e79055d6SMark Brown return -EINVAL; 859e79055d6SMark Brown } 860e79055d6SMark Brown 861e79055d6SMark Brown /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 862e79055d6SMark Brown for (i = 0; i < count; i++) { 863e79055d6SMark Brown int value; 864e79055d6SMark Brown 865e79055d6SMark Brown value = ops->list_voltage(rdev, i); 866e79055d6SMark Brown if (value <= 0) 867e79055d6SMark Brown continue; 868e79055d6SMark Brown 869e79055d6SMark Brown /* maybe adjust [min_uV..max_uV] */ 870e79055d6SMark Brown if (value >= cmin && value < min_uV) 871e79055d6SMark Brown min_uV = value; 872e79055d6SMark Brown if (value <= cmax && value > max_uV) 873e79055d6SMark Brown max_uV = value; 874e79055d6SMark Brown } 875e79055d6SMark Brown 876e79055d6SMark Brown /* final: [min_uV..max_uV] valid iff constraints valid */ 877e79055d6SMark Brown if (max_uV < min_uV) { 8785da84fd9SJoe Perches rdev_err(rdev, "unsupportable voltage constraints\n"); 879e79055d6SMark Brown return -EINVAL; 880e79055d6SMark Brown } 881e79055d6SMark Brown 882e79055d6SMark Brown /* use regulator's subset of machine constraints */ 883e79055d6SMark Brown if (constraints->min_uV < min_uV) { 8845da84fd9SJoe Perches rdev_dbg(rdev, "override min_uV, %d -> %d\n", 8855da84fd9SJoe Perches constraints->min_uV, min_uV); 886e79055d6SMark Brown constraints->min_uV = min_uV; 887e79055d6SMark Brown } 888e79055d6SMark Brown if (constraints->max_uV > max_uV) { 8895da84fd9SJoe Perches rdev_dbg(rdev, "override max_uV, %d -> %d\n", 8905da84fd9SJoe Perches constraints->max_uV, max_uV); 891e79055d6SMark Brown constraints->max_uV = max_uV; 892e79055d6SMark Brown } 893e79055d6SMark Brown } 894e79055d6SMark Brown 895e79055d6SMark Brown return 0; 896e79055d6SMark Brown } 897e79055d6SMark Brown 898a5766f11SLiam Girdwood /** 899a5766f11SLiam Girdwood * set_machine_constraints - sets regulator constraints 90069279fb9SMark Brown * @rdev: regulator source 901c8e7e464SMark Brown * @constraints: constraints to apply 902a5766f11SLiam Girdwood * 903a5766f11SLiam Girdwood * Allows platform initialisation code to define and constrain 904a5766f11SLiam Girdwood * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 905a5766f11SLiam Girdwood * Constraints *must* be set by platform code in order for some 906a5766f11SLiam Girdwood * regulator operations to proceed i.e. set_voltage, set_current_limit, 907a5766f11SLiam Girdwood * set_mode. 908a5766f11SLiam Girdwood */ 909a5766f11SLiam Girdwood static int set_machine_constraints(struct regulator_dev *rdev, 910f8c12fe3SMark Brown const struct regulation_constraints *constraints) 911a5766f11SLiam Girdwood { 912a5766f11SLiam Girdwood int ret = 0; 913e5fda26cSMark Brown struct regulator_ops *ops = rdev->desc->ops; 914e06f5b4fSMark Brown 9159a8f5e07SMark Brown if (constraints) 916f8c12fe3SMark Brown rdev->constraints = kmemdup(constraints, sizeof(*constraints), 917f8c12fe3SMark Brown GFP_KERNEL); 9189a8f5e07SMark Brown else 9199a8f5e07SMark Brown rdev->constraints = kzalloc(sizeof(*constraints), 9209a8f5e07SMark Brown GFP_KERNEL); 921f8c12fe3SMark Brown if (!rdev->constraints) 922f8c12fe3SMark Brown return -ENOMEM; 923af5866c9SMark Brown 924f8c12fe3SMark Brown ret = machine_constraints_voltage(rdev, rdev->constraints); 925e79055d6SMark Brown if (ret != 0) 9263e2b9abdSMark Brown goto out; 9273e2b9abdSMark Brown 928a5766f11SLiam Girdwood /* do we need to setup our suspend state */ 9299a8f5e07SMark Brown if (rdev->constraints->initial_state) { 930f8c12fe3SMark Brown ret = suspend_prepare(rdev, rdev->constraints->initial_state); 931e06f5b4fSMark Brown if (ret < 0) { 9325da84fd9SJoe Perches rdev_err(rdev, "failed to set suspend state\n"); 933e06f5b4fSMark Brown goto out; 934e06f5b4fSMark Brown } 935e06f5b4fSMark Brown } 936a5766f11SLiam Girdwood 9379a8f5e07SMark Brown if (rdev->constraints->initial_mode) { 938a308466cSMark Brown if (!ops->set_mode) { 9395da84fd9SJoe Perches rdev_err(rdev, "no set_mode operation\n"); 940a308466cSMark Brown ret = -EINVAL; 941a308466cSMark Brown goto out; 942a308466cSMark Brown } 943a308466cSMark Brown 944f8c12fe3SMark Brown ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 945a308466cSMark Brown if (ret < 0) { 9465da84fd9SJoe Perches rdev_err(rdev, "failed to set initial mode: %d\n", ret); 947a308466cSMark Brown goto out; 948a308466cSMark Brown } 949a308466cSMark Brown } 950a308466cSMark Brown 951cacf90f2SMark Brown /* If the constraints say the regulator should be on at this point 952cacf90f2SMark Brown * and we have control then make sure it is enabled. 953cacf90f2SMark Brown */ 954f8c12fe3SMark Brown if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 955f8c12fe3SMark Brown ops->enable) { 956e5fda26cSMark Brown ret = ops->enable(rdev); 957e5fda26cSMark Brown if (ret < 0) { 9585da84fd9SJoe Perches rdev_err(rdev, "failed to enable\n"); 959e5fda26cSMark Brown goto out; 960e5fda26cSMark Brown } 961e5fda26cSMark Brown } 962e5fda26cSMark Brown 963a5766f11SLiam Girdwood print_constraints(rdev); 9641a6958e7SAxel Lin return 0; 965a5766f11SLiam Girdwood out: 9661a6958e7SAxel Lin kfree(rdev->constraints); 9671a6958e7SAxel Lin rdev->constraints = NULL; 968a5766f11SLiam Girdwood return ret; 969a5766f11SLiam Girdwood } 970a5766f11SLiam Girdwood 971a5766f11SLiam Girdwood /** 972a5766f11SLiam Girdwood * set_supply - set regulator supply regulator 97369279fb9SMark Brown * @rdev: regulator name 97469279fb9SMark Brown * @supply_rdev: supply regulator name 975a5766f11SLiam Girdwood * 976a5766f11SLiam Girdwood * Called by platform initialisation code to set the supply regulator for this 977a5766f11SLiam Girdwood * regulator. This ensures that a regulators supply will also be enabled by the 978a5766f11SLiam Girdwood * core if it's child is enabled. 979a5766f11SLiam Girdwood */ 980a5766f11SLiam Girdwood static int set_supply(struct regulator_dev *rdev, 981a5766f11SLiam Girdwood struct regulator_dev *supply_rdev) 982a5766f11SLiam Girdwood { 983a5766f11SLiam Girdwood int err; 984a5766f11SLiam Girdwood 9853801b86aSMark Brown rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 9863801b86aSMark Brown 9873801b86aSMark Brown rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 9883801b86aSMark Brown if (IS_ERR(rdev->supply)) { 9893801b86aSMark Brown err = PTR_ERR(rdev->supply); 9903801b86aSMark Brown rdev->supply = NULL; 991a5766f11SLiam Girdwood return err; 992a5766f11SLiam Girdwood } 993a5766f11SLiam Girdwood 9943801b86aSMark Brown return 0; 9953801b86aSMark Brown } 9963801b86aSMark Brown 997a5766f11SLiam Girdwood /** 99806c63f93SRandy Dunlap * set_consumer_device_supply - Bind a regulator to a symbolic supply 99969279fb9SMark Brown * @rdev: regulator source 100069279fb9SMark Brown * @consumer_dev: device the supply applies to 100140f9244fSMark Brown * @consumer_dev_name: dev_name() string for device supply applies to 1002a5766f11SLiam Girdwood * @supply: symbolic name for supply 1003a5766f11SLiam Girdwood * 1004a5766f11SLiam Girdwood * Allows platform initialisation code to map physical regulator 1005a5766f11SLiam Girdwood * sources to symbolic names for supplies for use by devices. Devices 1006a5766f11SLiam Girdwood * should use these symbolic names to request regulators, avoiding the 1007a5766f11SLiam Girdwood * need to provide board-specific regulator names as platform data. 100840f9244fSMark Brown * 100940f9244fSMark Brown * Only one of consumer_dev and consumer_dev_name may be specified. 1010a5766f11SLiam Girdwood */ 1011a5766f11SLiam Girdwood static int set_consumer_device_supply(struct regulator_dev *rdev, 101240f9244fSMark Brown struct device *consumer_dev, const char *consumer_dev_name, 101340f9244fSMark Brown const char *supply) 1014a5766f11SLiam Girdwood { 1015a5766f11SLiam Girdwood struct regulator_map *node; 10169ed2099eSMark Brown int has_dev; 1017a5766f11SLiam Girdwood 101840f9244fSMark Brown if (consumer_dev && consumer_dev_name) 101940f9244fSMark Brown return -EINVAL; 102040f9244fSMark Brown 102140f9244fSMark Brown if (!consumer_dev_name && consumer_dev) 102240f9244fSMark Brown consumer_dev_name = dev_name(consumer_dev); 102340f9244fSMark Brown 1024a5766f11SLiam Girdwood if (supply == NULL) 1025a5766f11SLiam Girdwood return -EINVAL; 1026a5766f11SLiam Girdwood 10279ed2099eSMark Brown if (consumer_dev_name != NULL) 10289ed2099eSMark Brown has_dev = 1; 10299ed2099eSMark Brown else 10309ed2099eSMark Brown has_dev = 0; 10319ed2099eSMark Brown 10326001e13cSDavid Brownell list_for_each_entry(node, ®ulator_map_list, list) { 103323b5cc2aSJani Nikula if (node->dev_name && consumer_dev_name) { 103423b5cc2aSJani Nikula if (strcmp(node->dev_name, consumer_dev_name) != 0) 10356001e13cSDavid Brownell continue; 103623b5cc2aSJani Nikula } else if (node->dev_name || consumer_dev_name) { 103723b5cc2aSJani Nikula continue; 103823b5cc2aSJani Nikula } 103923b5cc2aSJani Nikula 10406001e13cSDavid Brownell if (strcmp(node->supply, supply) != 0) 10416001e13cSDavid Brownell continue; 10426001e13cSDavid Brownell 10436001e13cSDavid Brownell dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 10446001e13cSDavid Brownell dev_name(&node->regulator->dev), 10456001e13cSDavid Brownell node->regulator->desc->name, 10466001e13cSDavid Brownell supply, 10471083c393SMark Brown dev_name(&rdev->dev), rdev_get_name(rdev)); 10486001e13cSDavid Brownell return -EBUSY; 10496001e13cSDavid Brownell } 10506001e13cSDavid Brownell 10519ed2099eSMark Brown node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1052a5766f11SLiam Girdwood if (node == NULL) 1053a5766f11SLiam Girdwood return -ENOMEM; 1054a5766f11SLiam Girdwood 1055a5766f11SLiam Girdwood node->regulator = rdev; 1056a5766f11SLiam Girdwood node->supply = supply; 1057a5766f11SLiam Girdwood 10589ed2099eSMark Brown if (has_dev) { 10599ed2099eSMark Brown node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 106040f9244fSMark Brown if (node->dev_name == NULL) { 106140f9244fSMark Brown kfree(node); 106240f9244fSMark Brown return -ENOMEM; 106340f9244fSMark Brown } 10649ed2099eSMark Brown } 106540f9244fSMark Brown 1066a5766f11SLiam Girdwood list_add(&node->list, ®ulator_map_list); 1067a5766f11SLiam Girdwood return 0; 1068a5766f11SLiam Girdwood } 1069a5766f11SLiam Girdwood 10700f1d747bSMike Rapoport static void unset_regulator_supplies(struct regulator_dev *rdev) 10710f1d747bSMike Rapoport { 10720f1d747bSMike Rapoport struct regulator_map *node, *n; 10730f1d747bSMike Rapoport 10740f1d747bSMike Rapoport list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 10750f1d747bSMike Rapoport if (rdev == node->regulator) { 10760f1d747bSMike Rapoport list_del(&node->list); 107740f9244fSMark Brown kfree(node->dev_name); 10780f1d747bSMike Rapoport kfree(node); 10790f1d747bSMike Rapoport } 10800f1d747bSMike Rapoport } 10810f1d747bSMike Rapoport } 10820f1d747bSMike Rapoport 1083f5726ae3SMark Brown #define REG_STR_SIZE 64 1084414c70cbSLiam Girdwood 1085414c70cbSLiam Girdwood static struct regulator *create_regulator(struct regulator_dev *rdev, 1086414c70cbSLiam Girdwood struct device *dev, 1087414c70cbSLiam Girdwood const char *supply_name) 1088414c70cbSLiam Girdwood { 1089414c70cbSLiam Girdwood struct regulator *regulator; 1090414c70cbSLiam Girdwood char buf[REG_STR_SIZE]; 1091414c70cbSLiam Girdwood int err, size; 1092414c70cbSLiam Girdwood 1093414c70cbSLiam Girdwood regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1094414c70cbSLiam Girdwood if (regulator == NULL) 1095414c70cbSLiam Girdwood return NULL; 1096414c70cbSLiam Girdwood 1097414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1098414c70cbSLiam Girdwood regulator->rdev = rdev; 1099414c70cbSLiam Girdwood list_add(®ulator->list, &rdev->consumer_list); 1100414c70cbSLiam Girdwood 1101414c70cbSLiam Girdwood if (dev) { 1102414c70cbSLiam Girdwood /* create a 'requested_microamps_name' sysfs entry */ 1103e0eaedefSMark Brown size = scnprintf(buf, REG_STR_SIZE, 1104e0eaedefSMark Brown "microamps_requested_%s-%s", 1105e0eaedefSMark Brown dev_name(dev), supply_name); 1106414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1107414c70cbSLiam Girdwood goto overflow_err; 1108414c70cbSLiam Girdwood 1109414c70cbSLiam Girdwood regulator->dev = dev; 11104f26a2abSAmeya Palande sysfs_attr_init(®ulator->dev_attr.attr); 1111414c70cbSLiam Girdwood regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1112414c70cbSLiam Girdwood if (regulator->dev_attr.attr.name == NULL) 1113414c70cbSLiam Girdwood goto attr_name_err; 1114414c70cbSLiam Girdwood 1115414c70cbSLiam Girdwood regulator->dev_attr.attr.mode = 0444; 1116414c70cbSLiam Girdwood regulator->dev_attr.show = device_requested_uA_show; 1117414c70cbSLiam Girdwood err = device_create_file(dev, ®ulator->dev_attr); 1118414c70cbSLiam Girdwood if (err < 0) { 11195da84fd9SJoe Perches rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1120414c70cbSLiam Girdwood goto attr_name_err; 1121414c70cbSLiam Girdwood } 1122414c70cbSLiam Girdwood 1123414c70cbSLiam Girdwood /* also add a link to the device sysfs entry */ 1124414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1125414c70cbSLiam Girdwood dev->kobj.name, supply_name); 1126414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1127414c70cbSLiam Girdwood goto attr_err; 1128414c70cbSLiam Girdwood 1129414c70cbSLiam Girdwood regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1130414c70cbSLiam Girdwood if (regulator->supply_name == NULL) 1131414c70cbSLiam Girdwood goto attr_err; 1132414c70cbSLiam Girdwood 1133414c70cbSLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1134414c70cbSLiam Girdwood buf); 1135414c70cbSLiam Girdwood if (err) { 11365da84fd9SJoe Perches rdev_warn(rdev, "could not add device link %s err %d\n", 11371d7372e1SDaniel Walker dev->kobj.name, err); 1138414c70cbSLiam Girdwood goto link_name_err; 1139414c70cbSLiam Girdwood } 11405de70519SMark Brown } else { 11415de70519SMark Brown regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 11425de70519SMark Brown if (regulator->supply_name == NULL) 11435de70519SMark Brown goto attr_err; 1144414c70cbSLiam Girdwood } 11455de70519SMark Brown 11465de70519SMark Brown #ifdef CONFIG_DEBUG_FS 11475de70519SMark Brown regulator->debugfs = debugfs_create_dir(regulator->supply_name, 11485de70519SMark Brown rdev->debugfs); 11495de70519SMark Brown if (IS_ERR_OR_NULL(regulator->debugfs)) { 11505de70519SMark Brown rdev_warn(rdev, "Failed to create debugfs directory\n"); 11515de70519SMark Brown regulator->debugfs = NULL; 11525de70519SMark Brown } else { 11535de70519SMark Brown debugfs_create_u32("uA_load", 0444, regulator->debugfs, 11545de70519SMark Brown ®ulator->uA_load); 11555de70519SMark Brown debugfs_create_u32("min_uV", 0444, regulator->debugfs, 11565de70519SMark Brown ®ulator->min_uV); 11575de70519SMark Brown debugfs_create_u32("max_uV", 0444, regulator->debugfs, 11585de70519SMark Brown ®ulator->max_uV); 11595de70519SMark Brown } 11605de70519SMark Brown #endif 11615de70519SMark Brown 1162414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1163414c70cbSLiam Girdwood return regulator; 1164414c70cbSLiam Girdwood link_name_err: 1165414c70cbSLiam Girdwood kfree(regulator->supply_name); 1166414c70cbSLiam Girdwood attr_err: 1167414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1168414c70cbSLiam Girdwood attr_name_err: 1169414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1170414c70cbSLiam Girdwood overflow_err: 1171414c70cbSLiam Girdwood list_del(®ulator->list); 1172414c70cbSLiam Girdwood kfree(regulator); 1173414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1174414c70cbSLiam Girdwood return NULL; 1175414c70cbSLiam Girdwood } 1176414c70cbSLiam Girdwood 117731aae2beSMark Brown static int _regulator_get_enable_time(struct regulator_dev *rdev) 117831aae2beSMark Brown { 117931aae2beSMark Brown if (!rdev->desc->ops->enable_time) 118031aae2beSMark Brown return 0; 118131aae2beSMark Brown return rdev->desc->ops->enable_time(rdev); 118231aae2beSMark Brown } 118331aae2beSMark Brown 118469511a45SRajendra Nayak static struct regulator_dev *regulator_dev_lookup(struct device *dev, 118569511a45SRajendra Nayak const char *supply) 118669511a45SRajendra Nayak { 118769511a45SRajendra Nayak struct regulator_dev *r; 118869511a45SRajendra Nayak struct device_node *node; 118969511a45SRajendra Nayak 119069511a45SRajendra Nayak /* first do a dt based lookup */ 119169511a45SRajendra Nayak if (dev && dev->of_node) { 119269511a45SRajendra Nayak node = of_get_regulator(dev, supply); 119369511a45SRajendra Nayak if (node) 119469511a45SRajendra Nayak list_for_each_entry(r, ®ulator_list, list) 119569511a45SRajendra Nayak if (r->dev.parent && 119669511a45SRajendra Nayak node == r->dev.of_node) 119769511a45SRajendra Nayak return r; 119869511a45SRajendra Nayak } 119969511a45SRajendra Nayak 120069511a45SRajendra Nayak /* if not found, try doing it non-dt way */ 120169511a45SRajendra Nayak list_for_each_entry(r, ®ulator_list, list) 120269511a45SRajendra Nayak if (strcmp(rdev_get_name(r), supply) == 0) 120369511a45SRajendra Nayak return r; 120469511a45SRajendra Nayak 120569511a45SRajendra Nayak return NULL; 120669511a45SRajendra Nayak } 120769511a45SRajendra Nayak 12085ffbd136SMark Brown /* Internal regulator request function */ 12095ffbd136SMark Brown static struct regulator *_regulator_get(struct device *dev, const char *id, 12105ffbd136SMark Brown int exclusive) 1211414c70cbSLiam Girdwood { 1212414c70cbSLiam Girdwood struct regulator_dev *rdev; 1213414c70cbSLiam Girdwood struct regulator_map *map; 1214414c70cbSLiam Girdwood struct regulator *regulator = ERR_PTR(-ENODEV); 121540f9244fSMark Brown const char *devname = NULL; 12165ffbd136SMark Brown int ret; 1217414c70cbSLiam Girdwood 1218414c70cbSLiam Girdwood if (id == NULL) { 12195da84fd9SJoe Perches pr_err("get() with no identifier\n"); 1220414c70cbSLiam Girdwood return regulator; 1221414c70cbSLiam Girdwood } 1222414c70cbSLiam Girdwood 122340f9244fSMark Brown if (dev) 122440f9244fSMark Brown devname = dev_name(dev); 122540f9244fSMark Brown 1226414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1227414c70cbSLiam Girdwood 122869511a45SRajendra Nayak rdev = regulator_dev_lookup(dev, id); 122969511a45SRajendra Nayak if (rdev) 123069511a45SRajendra Nayak goto found; 123169511a45SRajendra Nayak 1232414c70cbSLiam Girdwood list_for_each_entry(map, ®ulator_map_list, list) { 123340f9244fSMark Brown /* If the mapping has a device set up it must match */ 123440f9244fSMark Brown if (map->dev_name && 123540f9244fSMark Brown (!devname || strcmp(map->dev_name, devname))) 123640f9244fSMark Brown continue; 123740f9244fSMark Brown 123840f9244fSMark Brown if (strcmp(map->supply, id) == 0) { 1239a5766f11SLiam Girdwood rdev = map->regulator; 1240414c70cbSLiam Girdwood goto found; 1241414c70cbSLiam Girdwood } 1242a5766f11SLiam Girdwood } 124334abbd68SMark Brown 1244688fe99aSMark Brown if (board_wants_dummy_regulator) { 1245688fe99aSMark Brown rdev = dummy_regulator_rdev; 1246688fe99aSMark Brown goto found; 1247688fe99aSMark Brown } 1248688fe99aSMark Brown 124934abbd68SMark Brown #ifdef CONFIG_REGULATOR_DUMMY 125034abbd68SMark Brown if (!devname) 125134abbd68SMark Brown devname = "deviceless"; 125234abbd68SMark Brown 125334abbd68SMark Brown /* If the board didn't flag that it was fully constrained then 125434abbd68SMark Brown * substitute in a dummy regulator so consumers can continue. 125534abbd68SMark Brown */ 125634abbd68SMark Brown if (!has_full_constraints) { 12575da84fd9SJoe Perches pr_warn("%s supply %s not found, using dummy regulator\n", 125834abbd68SMark Brown devname, id); 125934abbd68SMark Brown rdev = dummy_regulator_rdev; 126034abbd68SMark Brown goto found; 126134abbd68SMark Brown } 126234abbd68SMark Brown #endif 126334abbd68SMark Brown 1264414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1265414c70cbSLiam Girdwood return regulator; 1266414c70cbSLiam Girdwood 1267414c70cbSLiam Girdwood found: 12685ffbd136SMark Brown if (rdev->exclusive) { 12695ffbd136SMark Brown regulator = ERR_PTR(-EPERM); 12705ffbd136SMark Brown goto out; 12715ffbd136SMark Brown } 12725ffbd136SMark Brown 12735ffbd136SMark Brown if (exclusive && rdev->open_count) { 12745ffbd136SMark Brown regulator = ERR_PTR(-EBUSY); 12755ffbd136SMark Brown goto out; 12765ffbd136SMark Brown } 12775ffbd136SMark Brown 1278a5766f11SLiam Girdwood if (!try_module_get(rdev->owner)) 1279a5766f11SLiam Girdwood goto out; 1280a5766f11SLiam Girdwood 1281414c70cbSLiam Girdwood regulator = create_regulator(rdev, dev, id); 1282414c70cbSLiam Girdwood if (regulator == NULL) { 1283414c70cbSLiam Girdwood regulator = ERR_PTR(-ENOMEM); 1284414c70cbSLiam Girdwood module_put(rdev->owner); 1285bcda4321SAxel Lin goto out; 1286414c70cbSLiam Girdwood } 1287414c70cbSLiam Girdwood 12885ffbd136SMark Brown rdev->open_count++; 12895ffbd136SMark Brown if (exclusive) { 12905ffbd136SMark Brown rdev->exclusive = 1; 12915ffbd136SMark Brown 12925ffbd136SMark Brown ret = _regulator_is_enabled(rdev); 12935ffbd136SMark Brown if (ret > 0) 12945ffbd136SMark Brown rdev->use_count = 1; 12955ffbd136SMark Brown else 12965ffbd136SMark Brown rdev->use_count = 0; 12975ffbd136SMark Brown } 12985ffbd136SMark Brown 1299a5766f11SLiam Girdwood out: 1300414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 13015ffbd136SMark Brown 1302414c70cbSLiam Girdwood return regulator; 1303414c70cbSLiam Girdwood } 13045ffbd136SMark Brown 13055ffbd136SMark Brown /** 13065ffbd136SMark Brown * regulator_get - lookup and obtain a reference to a regulator. 13075ffbd136SMark Brown * @dev: device for regulator "consumer" 13085ffbd136SMark Brown * @id: Supply name or regulator ID. 13095ffbd136SMark Brown * 13105ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 13115ffbd136SMark Brown * or IS_ERR() condition containing errno. 13125ffbd136SMark Brown * 13135ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 13145ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 13155ffbd136SMark Brown * should match the name used for the supply and/or the relevant 13165ffbd136SMark Brown * device pins in the datasheet. 13175ffbd136SMark Brown */ 13185ffbd136SMark Brown struct regulator *regulator_get(struct device *dev, const char *id) 13195ffbd136SMark Brown { 13205ffbd136SMark Brown return _regulator_get(dev, id, 0); 13215ffbd136SMark Brown } 1322414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get); 1323414c70cbSLiam Girdwood 1324414c70cbSLiam Girdwood /** 13255ffbd136SMark Brown * regulator_get_exclusive - obtain exclusive access to a regulator. 13265ffbd136SMark Brown * @dev: device for regulator "consumer" 13275ffbd136SMark Brown * @id: Supply name or regulator ID. 13285ffbd136SMark Brown * 13295ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 13305ffbd136SMark Brown * or IS_ERR() condition containing errno. Other consumers will be 13315ffbd136SMark Brown * unable to obtain this reference is held and the use count for the 13325ffbd136SMark Brown * regulator will be initialised to reflect the current state of the 13335ffbd136SMark Brown * regulator. 13345ffbd136SMark Brown * 13355ffbd136SMark Brown * This is intended for use by consumers which cannot tolerate shared 13365ffbd136SMark Brown * use of the regulator such as those which need to force the 13375ffbd136SMark Brown * regulator off for correct operation of the hardware they are 13385ffbd136SMark Brown * controlling. 13395ffbd136SMark Brown * 13405ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 13415ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 13425ffbd136SMark Brown * should match the name used for the supply and/or the relevant 13435ffbd136SMark Brown * device pins in the datasheet. 13445ffbd136SMark Brown */ 13455ffbd136SMark Brown struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 13465ffbd136SMark Brown { 13475ffbd136SMark Brown return _regulator_get(dev, id, 1); 13485ffbd136SMark Brown } 13495ffbd136SMark Brown EXPORT_SYMBOL_GPL(regulator_get_exclusive); 13505ffbd136SMark Brown 13515ffbd136SMark Brown /** 1352414c70cbSLiam Girdwood * regulator_put - "free" the regulator source 1353414c70cbSLiam Girdwood * @regulator: regulator source 1354414c70cbSLiam Girdwood * 1355414c70cbSLiam Girdwood * Note: drivers must ensure that all regulator_enable calls made on this 1356414c70cbSLiam Girdwood * regulator source are balanced by regulator_disable calls prior to calling 1357414c70cbSLiam Girdwood * this function. 1358414c70cbSLiam Girdwood */ 1359414c70cbSLiam Girdwood void regulator_put(struct regulator *regulator) 1360414c70cbSLiam Girdwood { 1361414c70cbSLiam Girdwood struct regulator_dev *rdev; 1362414c70cbSLiam Girdwood 1363414c70cbSLiam Girdwood if (regulator == NULL || IS_ERR(regulator)) 1364414c70cbSLiam Girdwood return; 1365414c70cbSLiam Girdwood 1366414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1367414c70cbSLiam Girdwood rdev = regulator->rdev; 1368414c70cbSLiam Girdwood 13695de70519SMark Brown #ifdef CONFIG_DEBUG_FS 13705de70519SMark Brown debugfs_remove_recursive(regulator->debugfs); 13715de70519SMark Brown #endif 13725de70519SMark Brown 1373414c70cbSLiam Girdwood /* remove any sysfs entries */ 1374414c70cbSLiam Girdwood if (regulator->dev) { 1375414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1376414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1377414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1378414c70cbSLiam Girdwood } 13795de70519SMark Brown kfree(regulator->supply_name); 1380414c70cbSLiam Girdwood list_del(®ulator->list); 1381414c70cbSLiam Girdwood kfree(regulator); 1382414c70cbSLiam Girdwood 13835ffbd136SMark Brown rdev->open_count--; 13845ffbd136SMark Brown rdev->exclusive = 0; 13855ffbd136SMark Brown 1386414c70cbSLiam Girdwood module_put(rdev->owner); 1387414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1388414c70cbSLiam Girdwood } 1389414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_put); 1390414c70cbSLiam Girdwood 13919a2372faSMark Brown static int _regulator_can_change_status(struct regulator_dev *rdev) 13929a2372faSMark Brown { 13939a2372faSMark Brown if (!rdev->constraints) 13949a2372faSMark Brown return 0; 13959a2372faSMark Brown 13969a2372faSMark Brown if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 13979a2372faSMark Brown return 1; 13989a2372faSMark Brown else 13999a2372faSMark Brown return 0; 14009a2372faSMark Brown } 14019a2372faSMark Brown 1402414c70cbSLiam Girdwood /* locks held by regulator_enable() */ 1403414c70cbSLiam Girdwood static int _regulator_enable(struct regulator_dev *rdev) 1404414c70cbSLiam Girdwood { 140531aae2beSMark Brown int ret, delay; 1406414c70cbSLiam Girdwood 1407414c70cbSLiam Girdwood /* check voltage and requested load before enabling */ 1408414c70cbSLiam Girdwood if (rdev->constraints && 14099a2372faSMark Brown (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1410414c70cbSLiam Girdwood drms_uA_update(rdev); 1411414c70cbSLiam Girdwood 14129a2372faSMark Brown if (rdev->use_count == 0) { 14139a2372faSMark Brown /* The regulator may on if it's not switchable or left on */ 14149a2372faSMark Brown ret = _regulator_is_enabled(rdev); 14159a2372faSMark Brown if (ret == -EINVAL || ret == 0) { 14169a2372faSMark Brown if (!_regulator_can_change_status(rdev)) 14179a2372faSMark Brown return -EPERM; 14189a2372faSMark Brown 141931aae2beSMark Brown if (!rdev->desc->ops->enable) 142031aae2beSMark Brown return -EINVAL; 142131aae2beSMark Brown 142231aae2beSMark Brown /* Query before enabling in case configuration 142325985edcSLucas De Marchi * dependent. */ 142431aae2beSMark Brown ret = _regulator_get_enable_time(rdev); 142531aae2beSMark Brown if (ret >= 0) { 142631aae2beSMark Brown delay = ret; 142731aae2beSMark Brown } else { 14285da84fd9SJoe Perches rdev_warn(rdev, "enable_time() failed: %d\n", 142931aae2beSMark Brown ret); 143031aae2beSMark Brown delay = 0; 143131aae2beSMark Brown } 143231aae2beSMark Brown 143302fa3ec0SMark Brown trace_regulator_enable(rdev_get_name(rdev)); 143402fa3ec0SMark Brown 143531aae2beSMark Brown /* Allow the regulator to ramp; it would be useful 143631aae2beSMark Brown * to extend this for bulk operations so that the 143731aae2beSMark Brown * regulators can ramp together. */ 1438414c70cbSLiam Girdwood ret = rdev->desc->ops->enable(rdev); 14399a2372faSMark Brown if (ret < 0) 14409a2372faSMark Brown return ret; 144131aae2beSMark Brown 144202fa3ec0SMark Brown trace_regulator_enable_delay(rdev_get_name(rdev)); 144302fa3ec0SMark Brown 1444e36c1df8SAxel Lin if (delay >= 1000) { 144531aae2beSMark Brown mdelay(delay / 1000); 1446e36c1df8SAxel Lin udelay(delay % 1000); 1447e36c1df8SAxel Lin } else if (delay) { 144831aae2beSMark Brown udelay(delay); 1449e36c1df8SAxel Lin } 145031aae2beSMark Brown 145102fa3ec0SMark Brown trace_regulator_enable_complete(rdev_get_name(rdev)); 145202fa3ec0SMark Brown 1453a7433cffSLinus Walleij } else if (ret < 0) { 14545da84fd9SJoe Perches rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1455414c70cbSLiam Girdwood return ret; 1456414c70cbSLiam Girdwood } 1457a7433cffSLinus Walleij /* Fallthrough on positive return values - already enabled */ 1458414c70cbSLiam Girdwood } 1459414c70cbSLiam Girdwood 14609a2372faSMark Brown rdev->use_count++; 14619a2372faSMark Brown 14629a2372faSMark Brown return 0; 1463414c70cbSLiam Girdwood } 1464414c70cbSLiam Girdwood 1465414c70cbSLiam Girdwood /** 1466414c70cbSLiam Girdwood * regulator_enable - enable regulator output 1467414c70cbSLiam Girdwood * @regulator: regulator source 1468414c70cbSLiam Girdwood * 1469cf7bbcdfSMark Brown * Request that the regulator be enabled with the regulator output at 1470cf7bbcdfSMark Brown * the predefined voltage or current value. Calls to regulator_enable() 1471cf7bbcdfSMark Brown * must be balanced with calls to regulator_disable(). 1472cf7bbcdfSMark Brown * 1473414c70cbSLiam Girdwood * NOTE: the output value can be set by other drivers, boot loader or may be 1474cf7bbcdfSMark Brown * hardwired in the regulator. 1475414c70cbSLiam Girdwood */ 1476414c70cbSLiam Girdwood int regulator_enable(struct regulator *regulator) 1477414c70cbSLiam Girdwood { 1478412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1479412aec61SDavid Brownell int ret = 0; 1480414c70cbSLiam Girdwood 14813801b86aSMark Brown if (rdev->supply) { 14823801b86aSMark Brown ret = regulator_enable(rdev->supply); 14833801b86aSMark Brown if (ret != 0) 14843801b86aSMark Brown return ret; 14853801b86aSMark Brown } 14863801b86aSMark Brown 1487412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1488412aec61SDavid Brownell ret = _regulator_enable(rdev); 1489412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 14903801b86aSMark Brown 1491d1685e4eSHeiko Stübner if (ret != 0 && rdev->supply) 14923801b86aSMark Brown regulator_disable(rdev->supply); 14933801b86aSMark Brown 1494414c70cbSLiam Girdwood return ret; 1495414c70cbSLiam Girdwood } 1496414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_enable); 1497414c70cbSLiam Girdwood 1498414c70cbSLiam Girdwood /* locks held by regulator_disable() */ 14993801b86aSMark Brown static int _regulator_disable(struct regulator_dev *rdev) 1500414c70cbSLiam Girdwood { 1501414c70cbSLiam Girdwood int ret = 0; 1502414c70cbSLiam Girdwood 1503cd94b505SDavid Brownell if (WARN(rdev->use_count <= 0, 150443e7ee33SJoe Perches "unbalanced disables for %s\n", rdev_get_name(rdev))) 1505cd94b505SDavid Brownell return -EIO; 1506cd94b505SDavid Brownell 1507414c70cbSLiam Girdwood /* are we the last user and permitted to disable ? */ 150860ef66fcSMark Brown if (rdev->use_count == 1 && 150960ef66fcSMark Brown (rdev->constraints && !rdev->constraints->always_on)) { 1510414c70cbSLiam Girdwood 1511414c70cbSLiam Girdwood /* we are last user */ 15129a2372faSMark Brown if (_regulator_can_change_status(rdev) && 15139a2372faSMark Brown rdev->desc->ops->disable) { 151402fa3ec0SMark Brown trace_regulator_disable(rdev_get_name(rdev)); 151502fa3ec0SMark Brown 1516414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1517414c70cbSLiam Girdwood if (ret < 0) { 15185da84fd9SJoe Perches rdev_err(rdev, "failed to disable\n"); 1519414c70cbSLiam Girdwood return ret; 1520414c70cbSLiam Girdwood } 152184b68263SMark Brown 152202fa3ec0SMark Brown trace_regulator_disable_complete(rdev_get_name(rdev)); 152302fa3ec0SMark Brown 152484b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 152584b68263SMark Brown NULL); 1526414c70cbSLiam Girdwood } 1527414c70cbSLiam Girdwood 1528414c70cbSLiam Girdwood rdev->use_count = 0; 1529414c70cbSLiam Girdwood } else if (rdev->use_count > 1) { 1530414c70cbSLiam Girdwood 1531414c70cbSLiam Girdwood if (rdev->constraints && 1532414c70cbSLiam Girdwood (rdev->constraints->valid_ops_mask & 1533414c70cbSLiam Girdwood REGULATOR_CHANGE_DRMS)) 1534414c70cbSLiam Girdwood drms_uA_update(rdev); 1535414c70cbSLiam Girdwood 1536414c70cbSLiam Girdwood rdev->use_count--; 1537414c70cbSLiam Girdwood } 15383801b86aSMark Brown 1539414c70cbSLiam Girdwood return ret; 1540414c70cbSLiam Girdwood } 1541414c70cbSLiam Girdwood 1542414c70cbSLiam Girdwood /** 1543414c70cbSLiam Girdwood * regulator_disable - disable regulator output 1544414c70cbSLiam Girdwood * @regulator: regulator source 1545414c70cbSLiam Girdwood * 1546cf7bbcdfSMark Brown * Disable the regulator output voltage or current. Calls to 1547cf7bbcdfSMark Brown * regulator_enable() must be balanced with calls to 1548cf7bbcdfSMark Brown * regulator_disable(). 154969279fb9SMark Brown * 1550414c70cbSLiam Girdwood * NOTE: this will only disable the regulator output if no other consumer 1551cf7bbcdfSMark Brown * devices have it enabled, the regulator device supports disabling and 1552cf7bbcdfSMark Brown * machine constraints permit this operation. 1553414c70cbSLiam Girdwood */ 1554414c70cbSLiam Girdwood int regulator_disable(struct regulator *regulator) 1555414c70cbSLiam Girdwood { 1556412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1557412aec61SDavid Brownell int ret = 0; 1558414c70cbSLiam Girdwood 1559412aec61SDavid Brownell mutex_lock(&rdev->mutex); 15603801b86aSMark Brown ret = _regulator_disable(rdev); 1561412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 15628cbf811dSJeffrey Carlyle 15633801b86aSMark Brown if (ret == 0 && rdev->supply) 15643801b86aSMark Brown regulator_disable(rdev->supply); 15658cbf811dSJeffrey Carlyle 1566414c70cbSLiam Girdwood return ret; 1567414c70cbSLiam Girdwood } 1568414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_disable); 1569414c70cbSLiam Girdwood 1570414c70cbSLiam Girdwood /* locks held by regulator_force_disable() */ 15713801b86aSMark Brown static int _regulator_force_disable(struct regulator_dev *rdev) 1572414c70cbSLiam Girdwood { 1573414c70cbSLiam Girdwood int ret = 0; 1574414c70cbSLiam Girdwood 1575414c70cbSLiam Girdwood /* force disable */ 1576414c70cbSLiam Girdwood if (rdev->desc->ops->disable) { 1577414c70cbSLiam Girdwood /* ah well, who wants to live forever... */ 1578414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1579414c70cbSLiam Girdwood if (ret < 0) { 15805da84fd9SJoe Perches rdev_err(rdev, "failed to force disable\n"); 1581414c70cbSLiam Girdwood return ret; 1582414c70cbSLiam Girdwood } 1583414c70cbSLiam Girdwood /* notify other consumers that power has been forced off */ 158484b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 158584b68263SMark Brown REGULATOR_EVENT_DISABLE, NULL); 1586414c70cbSLiam Girdwood } 1587414c70cbSLiam Girdwood 1588414c70cbSLiam Girdwood return ret; 1589414c70cbSLiam Girdwood } 1590414c70cbSLiam Girdwood 1591414c70cbSLiam Girdwood /** 1592414c70cbSLiam Girdwood * regulator_force_disable - force disable regulator output 1593414c70cbSLiam Girdwood * @regulator: regulator source 1594414c70cbSLiam Girdwood * 1595414c70cbSLiam Girdwood * Forcibly disable the regulator output voltage or current. 1596414c70cbSLiam Girdwood * NOTE: this *will* disable the regulator output even if other consumer 1597414c70cbSLiam Girdwood * devices have it enabled. This should be used for situations when device 1598414c70cbSLiam Girdwood * damage will likely occur if the regulator is not disabled (e.g. over temp). 1599414c70cbSLiam Girdwood */ 1600414c70cbSLiam Girdwood int regulator_force_disable(struct regulator *regulator) 1601414c70cbSLiam Girdwood { 160282d15839SMark Brown struct regulator_dev *rdev = regulator->rdev; 1603414c70cbSLiam Girdwood int ret; 1604414c70cbSLiam Girdwood 160582d15839SMark Brown mutex_lock(&rdev->mutex); 1606414c70cbSLiam Girdwood regulator->uA_load = 0; 16073801b86aSMark Brown ret = _regulator_force_disable(regulator->rdev); 160882d15839SMark Brown mutex_unlock(&rdev->mutex); 16098cbf811dSJeffrey Carlyle 16103801b86aSMark Brown if (rdev->supply) 16113801b86aSMark Brown while (rdev->open_count--) 16123801b86aSMark Brown regulator_disable(rdev->supply); 16138cbf811dSJeffrey Carlyle 1614414c70cbSLiam Girdwood return ret; 1615414c70cbSLiam Girdwood } 1616414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_force_disable); 1617414c70cbSLiam Girdwood 1618da07ecd9SMark Brown static void regulator_disable_work(struct work_struct *work) 1619da07ecd9SMark Brown { 1620da07ecd9SMark Brown struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1621da07ecd9SMark Brown disable_work.work); 1622da07ecd9SMark Brown int count, i, ret; 1623da07ecd9SMark Brown 1624da07ecd9SMark Brown mutex_lock(&rdev->mutex); 1625da07ecd9SMark Brown 1626da07ecd9SMark Brown BUG_ON(!rdev->deferred_disables); 1627da07ecd9SMark Brown 1628da07ecd9SMark Brown count = rdev->deferred_disables; 1629da07ecd9SMark Brown rdev->deferred_disables = 0; 1630da07ecd9SMark Brown 1631da07ecd9SMark Brown for (i = 0; i < count; i++) { 1632da07ecd9SMark Brown ret = _regulator_disable(rdev); 1633da07ecd9SMark Brown if (ret != 0) 1634da07ecd9SMark Brown rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1635da07ecd9SMark Brown } 1636da07ecd9SMark Brown 1637da07ecd9SMark Brown mutex_unlock(&rdev->mutex); 1638da07ecd9SMark Brown 1639da07ecd9SMark Brown if (rdev->supply) { 1640da07ecd9SMark Brown for (i = 0; i < count; i++) { 1641da07ecd9SMark Brown ret = regulator_disable(rdev->supply); 1642da07ecd9SMark Brown if (ret != 0) { 1643da07ecd9SMark Brown rdev_err(rdev, 1644da07ecd9SMark Brown "Supply disable failed: %d\n", ret); 1645da07ecd9SMark Brown } 1646da07ecd9SMark Brown } 1647da07ecd9SMark Brown } 1648da07ecd9SMark Brown } 1649da07ecd9SMark Brown 1650da07ecd9SMark Brown /** 1651da07ecd9SMark Brown * regulator_disable_deferred - disable regulator output with delay 1652da07ecd9SMark Brown * @regulator: regulator source 1653da07ecd9SMark Brown * @ms: miliseconds until the regulator is disabled 1654da07ecd9SMark Brown * 1655da07ecd9SMark Brown * Execute regulator_disable() on the regulator after a delay. This 1656da07ecd9SMark Brown * is intended for use with devices that require some time to quiesce. 1657da07ecd9SMark Brown * 1658da07ecd9SMark Brown * NOTE: this will only disable the regulator output if no other consumer 1659da07ecd9SMark Brown * devices have it enabled, the regulator device supports disabling and 1660da07ecd9SMark Brown * machine constraints permit this operation. 1661da07ecd9SMark Brown */ 1662da07ecd9SMark Brown int regulator_disable_deferred(struct regulator *regulator, int ms) 1663da07ecd9SMark Brown { 1664da07ecd9SMark Brown struct regulator_dev *rdev = regulator->rdev; 1665aa59802dSMark Brown int ret; 1666da07ecd9SMark Brown 1667da07ecd9SMark Brown mutex_lock(&rdev->mutex); 1668da07ecd9SMark Brown rdev->deferred_disables++; 1669da07ecd9SMark Brown mutex_unlock(&rdev->mutex); 1670da07ecd9SMark Brown 1671aa59802dSMark Brown ret = schedule_delayed_work(&rdev->disable_work, 1672da07ecd9SMark Brown msecs_to_jiffies(ms)); 1673aa59802dSMark Brown if (ret < 0) 1674aa59802dSMark Brown return ret; 1675aa59802dSMark Brown else 1676aa59802dSMark Brown return 0; 1677da07ecd9SMark Brown } 1678da07ecd9SMark Brown EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1679da07ecd9SMark Brown 1680414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev) 1681414c70cbSLiam Girdwood { 16829a7f6a4cSMark Brown /* If we don't know then assume that the regulator is always on */ 16839332546fSMark Brown if (!rdev->desc->ops->is_enabled) 16849a7f6a4cSMark Brown return 1; 1685414c70cbSLiam Girdwood 16869332546fSMark Brown return rdev->desc->ops->is_enabled(rdev); 1687414c70cbSLiam Girdwood } 1688414c70cbSLiam Girdwood 1689414c70cbSLiam Girdwood /** 1690414c70cbSLiam Girdwood * regulator_is_enabled - is the regulator output enabled 1691414c70cbSLiam Girdwood * @regulator: regulator source 1692414c70cbSLiam Girdwood * 1693412aec61SDavid Brownell * Returns positive if the regulator driver backing the source/client 1694412aec61SDavid Brownell * has requested that the device be enabled, zero if it hasn't, else a 1695412aec61SDavid Brownell * negative errno code. 1696412aec61SDavid Brownell * 1697412aec61SDavid Brownell * Note that the device backing this regulator handle can have multiple 1698412aec61SDavid Brownell * users, so it might be enabled even if regulator_enable() was never 1699412aec61SDavid Brownell * called for this particular source. 1700414c70cbSLiam Girdwood */ 1701414c70cbSLiam Girdwood int regulator_is_enabled(struct regulator *regulator) 1702414c70cbSLiam Girdwood { 17039332546fSMark Brown int ret; 17049332546fSMark Brown 17059332546fSMark Brown mutex_lock(®ulator->rdev->mutex); 17069332546fSMark Brown ret = _regulator_is_enabled(regulator->rdev); 17079332546fSMark Brown mutex_unlock(®ulator->rdev->mutex); 17089332546fSMark Brown 17099332546fSMark Brown return ret; 1710414c70cbSLiam Girdwood } 1711414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_is_enabled); 1712414c70cbSLiam Girdwood 1713414c70cbSLiam Girdwood /** 17144367cfdcSDavid Brownell * regulator_count_voltages - count regulator_list_voltage() selectors 17154367cfdcSDavid Brownell * @regulator: regulator source 17164367cfdcSDavid Brownell * 17174367cfdcSDavid Brownell * Returns number of selectors, or negative errno. Selectors are 17184367cfdcSDavid Brownell * numbered starting at zero, and typically correspond to bitfields 17194367cfdcSDavid Brownell * in hardware registers. 17204367cfdcSDavid Brownell */ 17214367cfdcSDavid Brownell int regulator_count_voltages(struct regulator *regulator) 17224367cfdcSDavid Brownell { 17234367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 17244367cfdcSDavid Brownell 17254367cfdcSDavid Brownell return rdev->desc->n_voltages ? : -EINVAL; 17264367cfdcSDavid Brownell } 17274367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_count_voltages); 17284367cfdcSDavid Brownell 17294367cfdcSDavid Brownell /** 17304367cfdcSDavid Brownell * regulator_list_voltage - enumerate supported voltages 17314367cfdcSDavid Brownell * @regulator: regulator source 17324367cfdcSDavid Brownell * @selector: identify voltage to list 17334367cfdcSDavid Brownell * Context: can sleep 17344367cfdcSDavid Brownell * 17354367cfdcSDavid Brownell * Returns a voltage that can be passed to @regulator_set_voltage(), 173688393161SThomas Weber * zero if this selector code can't be used on this system, or a 17374367cfdcSDavid Brownell * negative errno. 17384367cfdcSDavid Brownell */ 17394367cfdcSDavid Brownell int regulator_list_voltage(struct regulator *regulator, unsigned selector) 17404367cfdcSDavid Brownell { 17414367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 17424367cfdcSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 17434367cfdcSDavid Brownell int ret; 17444367cfdcSDavid Brownell 17454367cfdcSDavid Brownell if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 17464367cfdcSDavid Brownell return -EINVAL; 17474367cfdcSDavid Brownell 17484367cfdcSDavid Brownell mutex_lock(&rdev->mutex); 17494367cfdcSDavid Brownell ret = ops->list_voltage(rdev, selector); 17504367cfdcSDavid Brownell mutex_unlock(&rdev->mutex); 17514367cfdcSDavid Brownell 17524367cfdcSDavid Brownell if (ret > 0) { 17534367cfdcSDavid Brownell if (ret < rdev->constraints->min_uV) 17544367cfdcSDavid Brownell ret = 0; 17554367cfdcSDavid Brownell else if (ret > rdev->constraints->max_uV) 17564367cfdcSDavid Brownell ret = 0; 17574367cfdcSDavid Brownell } 17584367cfdcSDavid Brownell 17594367cfdcSDavid Brownell return ret; 17604367cfdcSDavid Brownell } 17614367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_list_voltage); 17624367cfdcSDavid Brownell 17634367cfdcSDavid Brownell /** 1764a7a1ad90SMark Brown * regulator_is_supported_voltage - check if a voltage range can be supported 1765a7a1ad90SMark Brown * 1766a7a1ad90SMark Brown * @regulator: Regulator to check. 1767a7a1ad90SMark Brown * @min_uV: Minimum required voltage in uV. 1768a7a1ad90SMark Brown * @max_uV: Maximum required voltage in uV. 1769a7a1ad90SMark Brown * 1770a7a1ad90SMark Brown * Returns a boolean or a negative error code. 1771a7a1ad90SMark Brown */ 1772a7a1ad90SMark Brown int regulator_is_supported_voltage(struct regulator *regulator, 1773a7a1ad90SMark Brown int min_uV, int max_uV) 1774a7a1ad90SMark Brown { 1775a7a1ad90SMark Brown int i, voltages, ret; 1776a7a1ad90SMark Brown 1777a7a1ad90SMark Brown ret = regulator_count_voltages(regulator); 1778a7a1ad90SMark Brown if (ret < 0) 1779a7a1ad90SMark Brown return ret; 1780a7a1ad90SMark Brown voltages = ret; 1781a7a1ad90SMark Brown 1782a7a1ad90SMark Brown for (i = 0; i < voltages; i++) { 1783a7a1ad90SMark Brown ret = regulator_list_voltage(regulator, i); 1784a7a1ad90SMark Brown 1785a7a1ad90SMark Brown if (ret >= min_uV && ret <= max_uV) 1786a7a1ad90SMark Brown return 1; 1787a7a1ad90SMark Brown } 1788a7a1ad90SMark Brown 1789a7a1ad90SMark Brown return 0; 1790a7a1ad90SMark Brown } 1791a398eaa2SMark Brown EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); 1792a7a1ad90SMark Brown 179375790251SMark Brown static int _regulator_do_set_voltage(struct regulator_dev *rdev, 179475790251SMark Brown int min_uV, int max_uV) 179575790251SMark Brown { 179675790251SMark Brown int ret; 179777af1b26SLinus Walleij int delay = 0; 179875790251SMark Brown unsigned int selector; 179975790251SMark Brown 180075790251SMark Brown trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 180175790251SMark Brown 1802bf5892a8SMark Brown min_uV += rdev->constraints->uV_offset; 1803bf5892a8SMark Brown max_uV += rdev->constraints->uV_offset; 1804bf5892a8SMark Brown 180575790251SMark Brown if (rdev->desc->ops->set_voltage) { 180675790251SMark Brown ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 180775790251SMark Brown &selector); 180875790251SMark Brown 180975790251SMark Brown if (rdev->desc->ops->list_voltage) 181075790251SMark Brown selector = rdev->desc->ops->list_voltage(rdev, 181175790251SMark Brown selector); 181275790251SMark Brown else 181375790251SMark Brown selector = -1; 1814e8eef82bSMark Brown } else if (rdev->desc->ops->set_voltage_sel) { 1815e8eef82bSMark Brown int best_val = INT_MAX; 1816e8eef82bSMark Brown int i; 1817e8eef82bSMark Brown 1818e8eef82bSMark Brown selector = 0; 1819e8eef82bSMark Brown 1820e8eef82bSMark Brown /* Find the smallest voltage that falls within the specified 1821e8eef82bSMark Brown * range. 1822e8eef82bSMark Brown */ 1823e8eef82bSMark Brown for (i = 0; i < rdev->desc->n_voltages; i++) { 1824e8eef82bSMark Brown ret = rdev->desc->ops->list_voltage(rdev, i); 1825e8eef82bSMark Brown if (ret < 0) 1826e8eef82bSMark Brown continue; 1827e8eef82bSMark Brown 1828e8eef82bSMark Brown if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1829e8eef82bSMark Brown best_val = ret; 1830e8eef82bSMark Brown selector = i; 1831e8eef82bSMark Brown } 1832e8eef82bSMark Brown } 1833e8eef82bSMark Brown 183477af1b26SLinus Walleij /* 183577af1b26SLinus Walleij * If we can't obtain the old selector there is not enough 183677af1b26SLinus Walleij * info to call set_voltage_time_sel(). 183777af1b26SLinus Walleij */ 183877af1b26SLinus Walleij if (rdev->desc->ops->set_voltage_time_sel && 183977af1b26SLinus Walleij rdev->desc->ops->get_voltage_sel) { 184077af1b26SLinus Walleij unsigned int old_selector = 0; 184177af1b26SLinus Walleij 184277af1b26SLinus Walleij ret = rdev->desc->ops->get_voltage_sel(rdev); 184377af1b26SLinus Walleij if (ret < 0) 184477af1b26SLinus Walleij return ret; 184577af1b26SLinus Walleij old_selector = ret; 184677af1b26SLinus Walleij delay = rdev->desc->ops->set_voltage_time_sel(rdev, 184777af1b26SLinus Walleij old_selector, selector); 184877af1b26SLinus Walleij } 184977af1b26SLinus Walleij 1850e8eef82bSMark Brown if (best_val != INT_MAX) { 1851e8eef82bSMark Brown ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1852e8eef82bSMark Brown selector = best_val; 1853e8eef82bSMark Brown } else { 1854e8eef82bSMark Brown ret = -EINVAL; 1855e8eef82bSMark Brown } 185675790251SMark Brown } else { 185775790251SMark Brown ret = -EINVAL; 185875790251SMark Brown } 185975790251SMark Brown 186077af1b26SLinus Walleij /* Insert any necessary delays */ 186177af1b26SLinus Walleij if (delay >= 1000) { 186277af1b26SLinus Walleij mdelay(delay / 1000); 186377af1b26SLinus Walleij udelay(delay % 1000); 186477af1b26SLinus Walleij } else if (delay) { 186577af1b26SLinus Walleij udelay(delay); 186677af1b26SLinus Walleij } 186777af1b26SLinus Walleij 1868ded06a52SMark Brown if (ret == 0) 1869ded06a52SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1870ded06a52SMark Brown NULL); 1871ded06a52SMark Brown 187275790251SMark Brown trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 187375790251SMark Brown 187475790251SMark Brown return ret; 187575790251SMark Brown } 187675790251SMark Brown 1877a7a1ad90SMark Brown /** 1878414c70cbSLiam Girdwood * regulator_set_voltage - set regulator output voltage 1879414c70cbSLiam Girdwood * @regulator: regulator source 1880414c70cbSLiam Girdwood * @min_uV: Minimum required voltage in uV 1881414c70cbSLiam Girdwood * @max_uV: Maximum acceptable voltage in uV 1882414c70cbSLiam Girdwood * 1883414c70cbSLiam Girdwood * Sets a voltage regulator to the desired output voltage. This can be set 1884414c70cbSLiam Girdwood * during any regulator state. IOW, regulator can be disabled or enabled. 1885414c70cbSLiam Girdwood * 1886414c70cbSLiam Girdwood * If the regulator is enabled then the voltage will change to the new value 1887414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1888414c70cbSLiam Girdwood * output at the new voltage when enabled. 1889414c70cbSLiam Girdwood * 1890414c70cbSLiam Girdwood * NOTE: If the regulator is shared between several devices then the lowest 1891414c70cbSLiam Girdwood * request voltage that meets the system constraints will be used. 189269279fb9SMark Brown * Regulator system constraints must be set for this regulator before 1893414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1894414c70cbSLiam Girdwood */ 1895414c70cbSLiam Girdwood int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1896414c70cbSLiam Girdwood { 1897414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 189895a3c23aSMark Brown int ret = 0; 1899414c70cbSLiam Girdwood 1900414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1901414c70cbSLiam Girdwood 190295a3c23aSMark Brown /* If we're setting the same range as last time the change 190395a3c23aSMark Brown * should be a noop (some cpufreq implementations use the same 190495a3c23aSMark Brown * voltage for multiple frequencies, for example). 190595a3c23aSMark Brown */ 190695a3c23aSMark Brown if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 190795a3c23aSMark Brown goto out; 190895a3c23aSMark Brown 1909414c70cbSLiam Girdwood /* sanity check */ 1910e8eef82bSMark Brown if (!rdev->desc->ops->set_voltage && 1911e8eef82bSMark Brown !rdev->desc->ops->set_voltage_sel) { 1912414c70cbSLiam Girdwood ret = -EINVAL; 1913414c70cbSLiam Girdwood goto out; 1914414c70cbSLiam Girdwood } 1915414c70cbSLiam Girdwood 1916414c70cbSLiam Girdwood /* constraints check */ 1917414c70cbSLiam Girdwood ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1918414c70cbSLiam Girdwood if (ret < 0) 1919414c70cbSLiam Girdwood goto out; 1920414c70cbSLiam Girdwood regulator->min_uV = min_uV; 1921414c70cbSLiam Girdwood regulator->max_uV = max_uV; 19223a93f2a9SMark Brown 192305fda3b1SThomas Petazzoni ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 192405fda3b1SThomas Petazzoni if (ret < 0) 192505fda3b1SThomas Petazzoni goto out; 192605fda3b1SThomas Petazzoni 192775790251SMark Brown ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 192802fa3ec0SMark Brown 1929414c70cbSLiam Girdwood out: 1930414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1931414c70cbSLiam Girdwood return ret; 1932414c70cbSLiam Girdwood } 1933414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_voltage); 1934414c70cbSLiam Girdwood 1935606a2562SMark Brown /** 193688cd222bSLinus Walleij * regulator_set_voltage_time - get raise/fall time 193788cd222bSLinus Walleij * @regulator: regulator source 193888cd222bSLinus Walleij * @old_uV: starting voltage in microvolts 193988cd222bSLinus Walleij * @new_uV: target voltage in microvolts 194088cd222bSLinus Walleij * 194188cd222bSLinus Walleij * Provided with the starting and ending voltage, this function attempts to 194288cd222bSLinus Walleij * calculate the time in microseconds required to rise or fall to this new 194388cd222bSLinus Walleij * voltage. 194488cd222bSLinus Walleij */ 194588cd222bSLinus Walleij int regulator_set_voltage_time(struct regulator *regulator, 194688cd222bSLinus Walleij int old_uV, int new_uV) 194788cd222bSLinus Walleij { 194888cd222bSLinus Walleij struct regulator_dev *rdev = regulator->rdev; 194988cd222bSLinus Walleij struct regulator_ops *ops = rdev->desc->ops; 195088cd222bSLinus Walleij int old_sel = -1; 195188cd222bSLinus Walleij int new_sel = -1; 195288cd222bSLinus Walleij int voltage; 195388cd222bSLinus Walleij int i; 195488cd222bSLinus Walleij 195588cd222bSLinus Walleij /* Currently requires operations to do this */ 195688cd222bSLinus Walleij if (!ops->list_voltage || !ops->set_voltage_time_sel 195788cd222bSLinus Walleij || !rdev->desc->n_voltages) 195888cd222bSLinus Walleij return -EINVAL; 195988cd222bSLinus Walleij 196088cd222bSLinus Walleij for (i = 0; i < rdev->desc->n_voltages; i++) { 196188cd222bSLinus Walleij /* We only look for exact voltage matches here */ 196288cd222bSLinus Walleij voltage = regulator_list_voltage(regulator, i); 196388cd222bSLinus Walleij if (voltage < 0) 196488cd222bSLinus Walleij return -EINVAL; 196588cd222bSLinus Walleij if (voltage == 0) 196688cd222bSLinus Walleij continue; 196788cd222bSLinus Walleij if (voltage == old_uV) 196888cd222bSLinus Walleij old_sel = i; 196988cd222bSLinus Walleij if (voltage == new_uV) 197088cd222bSLinus Walleij new_sel = i; 197188cd222bSLinus Walleij } 197288cd222bSLinus Walleij 197388cd222bSLinus Walleij if (old_sel < 0 || new_sel < 0) 197488cd222bSLinus Walleij return -EINVAL; 197588cd222bSLinus Walleij 197688cd222bSLinus Walleij return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 197788cd222bSLinus Walleij } 197888cd222bSLinus Walleij EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 197988cd222bSLinus Walleij 198088cd222bSLinus Walleij /** 1981606a2562SMark Brown * regulator_sync_voltage - re-apply last regulator output voltage 1982606a2562SMark Brown * @regulator: regulator source 1983606a2562SMark Brown * 1984606a2562SMark Brown * Re-apply the last configured voltage. This is intended to be used 1985606a2562SMark Brown * where some external control source the consumer is cooperating with 1986606a2562SMark Brown * has caused the configured voltage to change. 1987606a2562SMark Brown */ 1988606a2562SMark Brown int regulator_sync_voltage(struct regulator *regulator) 1989606a2562SMark Brown { 1990606a2562SMark Brown struct regulator_dev *rdev = regulator->rdev; 1991606a2562SMark Brown int ret, min_uV, max_uV; 1992606a2562SMark Brown 1993606a2562SMark Brown mutex_lock(&rdev->mutex); 1994606a2562SMark Brown 1995606a2562SMark Brown if (!rdev->desc->ops->set_voltage && 1996606a2562SMark Brown !rdev->desc->ops->set_voltage_sel) { 1997606a2562SMark Brown ret = -EINVAL; 1998606a2562SMark Brown goto out; 1999606a2562SMark Brown } 2000606a2562SMark Brown 2001606a2562SMark Brown /* This is only going to work if we've had a voltage configured. */ 2002606a2562SMark Brown if (!regulator->min_uV && !regulator->max_uV) { 2003606a2562SMark Brown ret = -EINVAL; 2004606a2562SMark Brown goto out; 2005606a2562SMark Brown } 2006606a2562SMark Brown 2007606a2562SMark Brown min_uV = regulator->min_uV; 2008606a2562SMark Brown max_uV = regulator->max_uV; 2009606a2562SMark Brown 2010606a2562SMark Brown /* This should be a paranoia check... */ 2011606a2562SMark Brown ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 2012606a2562SMark Brown if (ret < 0) 2013606a2562SMark Brown goto out; 2014606a2562SMark Brown 2015606a2562SMark Brown ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 2016606a2562SMark Brown if (ret < 0) 2017606a2562SMark Brown goto out; 2018606a2562SMark Brown 2019606a2562SMark Brown ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 2020606a2562SMark Brown 2021606a2562SMark Brown out: 2022606a2562SMark Brown mutex_unlock(&rdev->mutex); 2023606a2562SMark Brown return ret; 2024606a2562SMark Brown } 2025606a2562SMark Brown EXPORT_SYMBOL_GPL(regulator_sync_voltage); 2026606a2562SMark Brown 2027414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev) 2028414c70cbSLiam Girdwood { 2029bf5892a8SMark Brown int sel, ret; 2030476c2d83SMark Brown 2031476c2d83SMark Brown if (rdev->desc->ops->get_voltage_sel) { 2032476c2d83SMark Brown sel = rdev->desc->ops->get_voltage_sel(rdev); 2033476c2d83SMark Brown if (sel < 0) 2034476c2d83SMark Brown return sel; 2035bf5892a8SMark Brown ret = rdev->desc->ops->list_voltage(rdev, sel); 2036cb220d16SAxel Lin } else if (rdev->desc->ops->get_voltage) { 2037bf5892a8SMark Brown ret = rdev->desc->ops->get_voltage(rdev); 2038cb220d16SAxel Lin } else { 2039414c70cbSLiam Girdwood return -EINVAL; 2040cb220d16SAxel Lin } 2041bf5892a8SMark Brown 2042cb220d16SAxel Lin if (ret < 0) 2043cb220d16SAxel Lin return ret; 2044bf5892a8SMark Brown return ret - rdev->constraints->uV_offset; 2045414c70cbSLiam Girdwood } 2046414c70cbSLiam Girdwood 2047414c70cbSLiam Girdwood /** 2048414c70cbSLiam Girdwood * regulator_get_voltage - get regulator output voltage 2049414c70cbSLiam Girdwood * @regulator: regulator source 2050414c70cbSLiam Girdwood * 2051414c70cbSLiam Girdwood * This returns the current regulator voltage in uV. 2052414c70cbSLiam Girdwood * 2053414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the voltage value. This 2054414c70cbSLiam Girdwood * function should not be used to determine regulator state. 2055414c70cbSLiam Girdwood */ 2056414c70cbSLiam Girdwood int regulator_get_voltage(struct regulator *regulator) 2057414c70cbSLiam Girdwood { 2058414c70cbSLiam Girdwood int ret; 2059414c70cbSLiam Girdwood 2060414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 2061414c70cbSLiam Girdwood 2062414c70cbSLiam Girdwood ret = _regulator_get_voltage(regulator->rdev); 2063414c70cbSLiam Girdwood 2064414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 2065414c70cbSLiam Girdwood 2066414c70cbSLiam Girdwood return ret; 2067414c70cbSLiam Girdwood } 2068414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_voltage); 2069414c70cbSLiam Girdwood 2070414c70cbSLiam Girdwood /** 2071414c70cbSLiam Girdwood * regulator_set_current_limit - set regulator output current limit 2072414c70cbSLiam Girdwood * @regulator: regulator source 2073414c70cbSLiam Girdwood * @min_uA: Minimuum supported current in uA 2074414c70cbSLiam Girdwood * @max_uA: Maximum supported current in uA 2075414c70cbSLiam Girdwood * 2076414c70cbSLiam Girdwood * Sets current sink to the desired output current. This can be set during 2077414c70cbSLiam Girdwood * any regulator state. IOW, regulator can be disabled or enabled. 2078414c70cbSLiam Girdwood * 2079414c70cbSLiam Girdwood * If the regulator is enabled then the current will change to the new value 2080414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 2081414c70cbSLiam Girdwood * output at the new current when enabled. 2082414c70cbSLiam Girdwood * 2083414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 2084414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 2085414c70cbSLiam Girdwood */ 2086414c70cbSLiam Girdwood int regulator_set_current_limit(struct regulator *regulator, 2087414c70cbSLiam Girdwood int min_uA, int max_uA) 2088414c70cbSLiam Girdwood { 2089414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2090414c70cbSLiam Girdwood int ret; 2091414c70cbSLiam Girdwood 2092414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2093414c70cbSLiam Girdwood 2094414c70cbSLiam Girdwood /* sanity check */ 2095414c70cbSLiam Girdwood if (!rdev->desc->ops->set_current_limit) { 2096414c70cbSLiam Girdwood ret = -EINVAL; 2097414c70cbSLiam Girdwood goto out; 2098414c70cbSLiam Girdwood } 2099414c70cbSLiam Girdwood 2100414c70cbSLiam Girdwood /* constraints check */ 2101414c70cbSLiam Girdwood ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2102414c70cbSLiam Girdwood if (ret < 0) 2103414c70cbSLiam Girdwood goto out; 2104414c70cbSLiam Girdwood 2105414c70cbSLiam Girdwood ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2106414c70cbSLiam Girdwood out: 2107414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2108414c70cbSLiam Girdwood return ret; 2109414c70cbSLiam Girdwood } 2110414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2111414c70cbSLiam Girdwood 2112414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev) 2113414c70cbSLiam Girdwood { 2114414c70cbSLiam Girdwood int ret; 2115414c70cbSLiam Girdwood 2116414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2117414c70cbSLiam Girdwood 2118414c70cbSLiam Girdwood /* sanity check */ 2119414c70cbSLiam Girdwood if (!rdev->desc->ops->get_current_limit) { 2120414c70cbSLiam Girdwood ret = -EINVAL; 2121414c70cbSLiam Girdwood goto out; 2122414c70cbSLiam Girdwood } 2123414c70cbSLiam Girdwood 2124414c70cbSLiam Girdwood ret = rdev->desc->ops->get_current_limit(rdev); 2125414c70cbSLiam Girdwood out: 2126414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2127414c70cbSLiam Girdwood return ret; 2128414c70cbSLiam Girdwood } 2129414c70cbSLiam Girdwood 2130414c70cbSLiam Girdwood /** 2131414c70cbSLiam Girdwood * regulator_get_current_limit - get regulator output current 2132414c70cbSLiam Girdwood * @regulator: regulator source 2133414c70cbSLiam Girdwood * 2134414c70cbSLiam Girdwood * This returns the current supplied by the specified current sink in uA. 2135414c70cbSLiam Girdwood * 2136414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the current value. This 2137414c70cbSLiam Girdwood * function should not be used to determine regulator state. 2138414c70cbSLiam Girdwood */ 2139414c70cbSLiam Girdwood int regulator_get_current_limit(struct regulator *regulator) 2140414c70cbSLiam Girdwood { 2141414c70cbSLiam Girdwood return _regulator_get_current_limit(regulator->rdev); 2142414c70cbSLiam Girdwood } 2143414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2144414c70cbSLiam Girdwood 2145414c70cbSLiam Girdwood /** 2146414c70cbSLiam Girdwood * regulator_set_mode - set regulator operating mode 2147414c70cbSLiam Girdwood * @regulator: regulator source 2148414c70cbSLiam Girdwood * @mode: operating mode - one of the REGULATOR_MODE constants 2149414c70cbSLiam Girdwood * 2150414c70cbSLiam Girdwood * Set regulator operating mode to increase regulator efficiency or improve 2151414c70cbSLiam Girdwood * regulation performance. 2152414c70cbSLiam Girdwood * 2153414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 2154414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 2155414c70cbSLiam Girdwood */ 2156414c70cbSLiam Girdwood int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2157414c70cbSLiam Girdwood { 2158414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2159414c70cbSLiam Girdwood int ret; 2160500b4ac9SSundar R Iyer int regulator_curr_mode; 2161414c70cbSLiam Girdwood 2162414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2163414c70cbSLiam Girdwood 2164414c70cbSLiam Girdwood /* sanity check */ 2165414c70cbSLiam Girdwood if (!rdev->desc->ops->set_mode) { 2166414c70cbSLiam Girdwood ret = -EINVAL; 2167414c70cbSLiam Girdwood goto out; 2168414c70cbSLiam Girdwood } 2169414c70cbSLiam Girdwood 2170500b4ac9SSundar R Iyer /* return if the same mode is requested */ 2171500b4ac9SSundar R Iyer if (rdev->desc->ops->get_mode) { 2172500b4ac9SSundar R Iyer regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2173500b4ac9SSundar R Iyer if (regulator_curr_mode == mode) { 2174500b4ac9SSundar R Iyer ret = 0; 2175500b4ac9SSundar R Iyer goto out; 2176500b4ac9SSundar R Iyer } 2177500b4ac9SSundar R Iyer } 2178500b4ac9SSundar R Iyer 2179414c70cbSLiam Girdwood /* constraints check */ 218022c51b47SAxel Lin ret = regulator_mode_constrain(rdev, &mode); 2181414c70cbSLiam Girdwood if (ret < 0) 2182414c70cbSLiam Girdwood goto out; 2183414c70cbSLiam Girdwood 2184414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 2185414c70cbSLiam Girdwood out: 2186414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2187414c70cbSLiam Girdwood return ret; 2188414c70cbSLiam Girdwood } 2189414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_mode); 2190414c70cbSLiam Girdwood 2191414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2192414c70cbSLiam Girdwood { 2193414c70cbSLiam Girdwood int ret; 2194414c70cbSLiam Girdwood 2195414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2196414c70cbSLiam Girdwood 2197414c70cbSLiam Girdwood /* sanity check */ 2198414c70cbSLiam Girdwood if (!rdev->desc->ops->get_mode) { 2199414c70cbSLiam Girdwood ret = -EINVAL; 2200414c70cbSLiam Girdwood goto out; 2201414c70cbSLiam Girdwood } 2202414c70cbSLiam Girdwood 2203414c70cbSLiam Girdwood ret = rdev->desc->ops->get_mode(rdev); 2204414c70cbSLiam Girdwood out: 2205414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2206414c70cbSLiam Girdwood return ret; 2207414c70cbSLiam Girdwood } 2208414c70cbSLiam Girdwood 2209414c70cbSLiam Girdwood /** 2210414c70cbSLiam Girdwood * regulator_get_mode - get regulator operating mode 2211414c70cbSLiam Girdwood * @regulator: regulator source 2212414c70cbSLiam Girdwood * 2213414c70cbSLiam Girdwood * Get the current regulator operating mode. 2214414c70cbSLiam Girdwood */ 2215414c70cbSLiam Girdwood unsigned int regulator_get_mode(struct regulator *regulator) 2216414c70cbSLiam Girdwood { 2217414c70cbSLiam Girdwood return _regulator_get_mode(regulator->rdev); 2218414c70cbSLiam Girdwood } 2219414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_mode); 2220414c70cbSLiam Girdwood 2221414c70cbSLiam Girdwood /** 2222414c70cbSLiam Girdwood * regulator_set_optimum_mode - set regulator optimum operating mode 2223414c70cbSLiam Girdwood * @regulator: regulator source 2224414c70cbSLiam Girdwood * @uA_load: load current 2225414c70cbSLiam Girdwood * 2226414c70cbSLiam Girdwood * Notifies the regulator core of a new device load. This is then used by 2227414c70cbSLiam Girdwood * DRMS (if enabled by constraints) to set the most efficient regulator 2228414c70cbSLiam Girdwood * operating mode for the new regulator loading. 2229414c70cbSLiam Girdwood * 2230414c70cbSLiam Girdwood * Consumer devices notify their supply regulator of the maximum power 2231414c70cbSLiam Girdwood * they will require (can be taken from device datasheet in the power 2232414c70cbSLiam Girdwood * consumption tables) when they change operational status and hence power 2233414c70cbSLiam Girdwood * state. Examples of operational state changes that can affect power 2234414c70cbSLiam Girdwood * consumption are :- 2235414c70cbSLiam Girdwood * 2236414c70cbSLiam Girdwood * o Device is opened / closed. 2237414c70cbSLiam Girdwood * o Device I/O is about to begin or has just finished. 2238414c70cbSLiam Girdwood * o Device is idling in between work. 2239414c70cbSLiam Girdwood * 2240414c70cbSLiam Girdwood * This information is also exported via sysfs to userspace. 2241414c70cbSLiam Girdwood * 2242414c70cbSLiam Girdwood * DRMS will sum the total requested load on the regulator and change 2243414c70cbSLiam Girdwood * to the most efficient operating mode if platform constraints allow. 2244414c70cbSLiam Girdwood * 2245414c70cbSLiam Girdwood * Returns the new regulator mode or error. 2246414c70cbSLiam Girdwood */ 2247414c70cbSLiam Girdwood int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2248414c70cbSLiam Girdwood { 2249414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2250414c70cbSLiam Girdwood struct regulator *consumer; 2251414c70cbSLiam Girdwood int ret, output_uV, input_uV, total_uA_load = 0; 2252414c70cbSLiam Girdwood unsigned int mode; 2253414c70cbSLiam Girdwood 2254414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2255414c70cbSLiam Girdwood 2256a4b41483SMark Brown /* 2257a4b41483SMark Brown * first check to see if we can set modes at all, otherwise just 2258a4b41483SMark Brown * tell the consumer everything is OK. 2259a4b41483SMark Brown */ 2260414c70cbSLiam Girdwood regulator->uA_load = uA_load; 2261414c70cbSLiam Girdwood ret = regulator_check_drms(rdev); 2262a4b41483SMark Brown if (ret < 0) { 2263a4b41483SMark Brown ret = 0; 2264414c70cbSLiam Girdwood goto out; 2265a4b41483SMark Brown } 2266414c70cbSLiam Girdwood 2267414c70cbSLiam Girdwood if (!rdev->desc->ops->get_optimum_mode) 2268414c70cbSLiam Girdwood goto out; 2269414c70cbSLiam Girdwood 2270a4b41483SMark Brown /* 2271a4b41483SMark Brown * we can actually do this so any errors are indicators of 2272a4b41483SMark Brown * potential real failure. 2273a4b41483SMark Brown */ 2274a4b41483SMark Brown ret = -EINVAL; 2275a4b41483SMark Brown 2276414c70cbSLiam Girdwood /* get output voltage */ 22771bf5a1f8SMark Brown output_uV = _regulator_get_voltage(rdev); 2278414c70cbSLiam Girdwood if (output_uV <= 0) { 22795da84fd9SJoe Perches rdev_err(rdev, "invalid output voltage found\n"); 2280414c70cbSLiam Girdwood goto out; 2281414c70cbSLiam Girdwood } 2282414c70cbSLiam Girdwood 2283414c70cbSLiam Girdwood /* get input voltage */ 22841bf5a1f8SMark Brown input_uV = 0; 22851bf5a1f8SMark Brown if (rdev->supply) 22863801b86aSMark Brown input_uV = regulator_get_voltage(rdev->supply); 22871bf5a1f8SMark Brown if (input_uV <= 0) 2288414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 2289414c70cbSLiam Girdwood if (input_uV <= 0) { 22905da84fd9SJoe Perches rdev_err(rdev, "invalid input voltage found\n"); 2291414c70cbSLiam Girdwood goto out; 2292414c70cbSLiam Girdwood } 2293414c70cbSLiam Girdwood 2294414c70cbSLiam Girdwood /* calc total requested load for this regulator */ 2295414c70cbSLiam Girdwood list_for_each_entry(consumer, &rdev->consumer_list, list) 2296414c70cbSLiam Girdwood total_uA_load += consumer->uA_load; 2297414c70cbSLiam Girdwood 2298414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, 2299414c70cbSLiam Girdwood input_uV, output_uV, 2300414c70cbSLiam Girdwood total_uA_load); 23012c608234SMark Brown ret = regulator_mode_constrain(rdev, &mode); 2302e573520bSDavid Brownell if (ret < 0) { 23035da84fd9SJoe Perches rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2304414c70cbSLiam Girdwood total_uA_load, input_uV, output_uV); 2305414c70cbSLiam Girdwood goto out; 2306414c70cbSLiam Girdwood } 2307414c70cbSLiam Girdwood 2308414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 2309e573520bSDavid Brownell if (ret < 0) { 23105da84fd9SJoe Perches rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2311414c70cbSLiam Girdwood goto out; 2312414c70cbSLiam Girdwood } 2313414c70cbSLiam Girdwood ret = mode; 2314414c70cbSLiam Girdwood out: 2315414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2316414c70cbSLiam Girdwood return ret; 2317414c70cbSLiam Girdwood } 2318414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2319414c70cbSLiam Girdwood 2320414c70cbSLiam Girdwood /** 2321414c70cbSLiam Girdwood * regulator_register_notifier - register regulator event notifier 2322414c70cbSLiam Girdwood * @regulator: regulator source 232369279fb9SMark Brown * @nb: notifier block 2324414c70cbSLiam Girdwood * 2325414c70cbSLiam Girdwood * Register notifier block to receive regulator events. 2326414c70cbSLiam Girdwood */ 2327414c70cbSLiam Girdwood int regulator_register_notifier(struct regulator *regulator, 2328414c70cbSLiam Girdwood struct notifier_block *nb) 2329414c70cbSLiam Girdwood { 2330414c70cbSLiam Girdwood return blocking_notifier_chain_register(®ulator->rdev->notifier, 2331414c70cbSLiam Girdwood nb); 2332414c70cbSLiam Girdwood } 2333414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register_notifier); 2334414c70cbSLiam Girdwood 2335414c70cbSLiam Girdwood /** 2336414c70cbSLiam Girdwood * regulator_unregister_notifier - unregister regulator event notifier 2337414c70cbSLiam Girdwood * @regulator: regulator source 233869279fb9SMark Brown * @nb: notifier block 2339414c70cbSLiam Girdwood * 2340414c70cbSLiam Girdwood * Unregister regulator event notifier block. 2341414c70cbSLiam Girdwood */ 2342414c70cbSLiam Girdwood int regulator_unregister_notifier(struct regulator *regulator, 2343414c70cbSLiam Girdwood struct notifier_block *nb) 2344414c70cbSLiam Girdwood { 2345414c70cbSLiam Girdwood return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2346414c70cbSLiam Girdwood nb); 2347414c70cbSLiam Girdwood } 2348414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2349414c70cbSLiam Girdwood 2350b136fb44SJonathan Cameron /* notify regulator consumers and downstream regulator consumers. 2351b136fb44SJonathan Cameron * Note mutex must be held by caller. 2352b136fb44SJonathan Cameron */ 2353414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 2354414c70cbSLiam Girdwood unsigned long event, void *data) 2355414c70cbSLiam Girdwood { 2356414c70cbSLiam Girdwood /* call rdev chain first */ 2357414c70cbSLiam Girdwood blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2358414c70cbSLiam Girdwood } 2359414c70cbSLiam Girdwood 2360414c70cbSLiam Girdwood /** 2361414c70cbSLiam Girdwood * regulator_bulk_get - get multiple regulator consumers 2362414c70cbSLiam Girdwood * 2363414c70cbSLiam Girdwood * @dev: Device to supply 2364414c70cbSLiam Girdwood * @num_consumers: Number of consumers to register 2365414c70cbSLiam Girdwood * @consumers: Configuration of consumers; clients are stored here. 2366414c70cbSLiam Girdwood * 2367414c70cbSLiam Girdwood * @return 0 on success, an errno on failure. 2368414c70cbSLiam Girdwood * 2369414c70cbSLiam Girdwood * This helper function allows drivers to get several regulator 2370414c70cbSLiam Girdwood * consumers in one operation. If any of the regulators cannot be 2371414c70cbSLiam Girdwood * acquired then any regulators that were allocated will be freed 2372414c70cbSLiam Girdwood * before returning to the caller. 2373414c70cbSLiam Girdwood */ 2374414c70cbSLiam Girdwood int regulator_bulk_get(struct device *dev, int num_consumers, 2375414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2376414c70cbSLiam Girdwood { 2377414c70cbSLiam Girdwood int i; 2378414c70cbSLiam Girdwood int ret; 2379414c70cbSLiam Girdwood 2380414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) 2381414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2382414c70cbSLiam Girdwood 2383414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2384414c70cbSLiam Girdwood consumers[i].consumer = regulator_get(dev, 2385414c70cbSLiam Girdwood consumers[i].supply); 2386414c70cbSLiam Girdwood if (IS_ERR(consumers[i].consumer)) { 2387414c70cbSLiam Girdwood ret = PTR_ERR(consumers[i].consumer); 23885b307627SMark Brown dev_err(dev, "Failed to get supply '%s': %d\n", 23895b307627SMark Brown consumers[i].supply, ret); 2390414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2391414c70cbSLiam Girdwood goto err; 2392414c70cbSLiam Girdwood } 2393414c70cbSLiam Girdwood } 2394414c70cbSLiam Girdwood 2395414c70cbSLiam Girdwood return 0; 2396414c70cbSLiam Girdwood 2397414c70cbSLiam Girdwood err: 2398414c70cbSLiam Girdwood for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2399414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2400414c70cbSLiam Girdwood 2401414c70cbSLiam Girdwood return ret; 2402414c70cbSLiam Girdwood } 2403414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_get); 2404414c70cbSLiam Girdwood 2405f21e0e81SMark Brown static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2406f21e0e81SMark Brown { 2407f21e0e81SMark Brown struct regulator_bulk_data *bulk = data; 2408f21e0e81SMark Brown 2409f21e0e81SMark Brown bulk->ret = regulator_enable(bulk->consumer); 2410f21e0e81SMark Brown } 2411f21e0e81SMark Brown 2412414c70cbSLiam Girdwood /** 2413414c70cbSLiam Girdwood * regulator_bulk_enable - enable multiple regulator consumers 2414414c70cbSLiam Girdwood * 2415414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2416414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2417414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2418414c70cbSLiam Girdwood * 2419414c70cbSLiam Girdwood * This convenience API allows consumers to enable multiple regulator 2420414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2421414c70cbSLiam Girdwood * then any others that were enabled will be disabled again prior to 2422414c70cbSLiam Girdwood * return. 2423414c70cbSLiam Girdwood */ 2424414c70cbSLiam Girdwood int regulator_bulk_enable(int num_consumers, 2425414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2426414c70cbSLiam Girdwood { 2427f21e0e81SMark Brown LIST_HEAD(async_domain); 2428414c70cbSLiam Girdwood int i; 2429f21e0e81SMark Brown int ret = 0; 2430414c70cbSLiam Girdwood 2431f21e0e81SMark Brown for (i = 0; i < num_consumers; i++) 2432f21e0e81SMark Brown async_schedule_domain(regulator_bulk_enable_async, 2433f21e0e81SMark Brown &consumers[i], &async_domain); 2434f21e0e81SMark Brown 2435f21e0e81SMark Brown async_synchronize_full_domain(&async_domain); 2436f21e0e81SMark Brown 2437f21e0e81SMark Brown /* If any consumer failed we need to unwind any that succeeded */ 2438414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2439f21e0e81SMark Brown if (consumers[i].ret != 0) { 2440f21e0e81SMark Brown ret = consumers[i].ret; 2441414c70cbSLiam Girdwood goto err; 2442414c70cbSLiam Girdwood } 2443f21e0e81SMark Brown } 2444414c70cbSLiam Girdwood 2445414c70cbSLiam Girdwood return 0; 2446414c70cbSLiam Girdwood 2447414c70cbSLiam Girdwood err: 2448f21e0e81SMark Brown for (i = 0; i < num_consumers; i++) 2449f21e0e81SMark Brown if (consumers[i].ret == 0) 2450414c70cbSLiam Girdwood regulator_disable(consumers[i].consumer); 2451f21e0e81SMark Brown else 2452f21e0e81SMark Brown pr_err("Failed to enable %s: %d\n", 2453f21e0e81SMark Brown consumers[i].supply, consumers[i].ret); 2454414c70cbSLiam Girdwood 2455414c70cbSLiam Girdwood return ret; 2456414c70cbSLiam Girdwood } 2457414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2458414c70cbSLiam Girdwood 2459414c70cbSLiam Girdwood /** 2460414c70cbSLiam Girdwood * regulator_bulk_disable - disable multiple regulator consumers 2461414c70cbSLiam Girdwood * 2462414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2463414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2464414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2465414c70cbSLiam Girdwood * 2466414c70cbSLiam Girdwood * This convenience API allows consumers to disable multiple regulator 2467414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2468414c70cbSLiam Girdwood * then any others that were disabled will be disabled again prior to 2469414c70cbSLiam Girdwood * return. 2470414c70cbSLiam Girdwood */ 2471414c70cbSLiam Girdwood int regulator_bulk_disable(int num_consumers, 2472414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2473414c70cbSLiam Girdwood { 2474414c70cbSLiam Girdwood int i; 2475414c70cbSLiam Girdwood int ret; 2476414c70cbSLiam Girdwood 2477414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2478414c70cbSLiam Girdwood ret = regulator_disable(consumers[i].consumer); 2479414c70cbSLiam Girdwood if (ret != 0) 2480414c70cbSLiam Girdwood goto err; 2481414c70cbSLiam Girdwood } 2482414c70cbSLiam Girdwood 2483414c70cbSLiam Girdwood return 0; 2484414c70cbSLiam Girdwood 2485414c70cbSLiam Girdwood err: 24865da84fd9SJoe Perches pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2487eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2488414c70cbSLiam Girdwood regulator_enable(consumers[i].consumer); 2489414c70cbSLiam Girdwood 2490414c70cbSLiam Girdwood return ret; 2491414c70cbSLiam Girdwood } 2492414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2493414c70cbSLiam Girdwood 2494414c70cbSLiam Girdwood /** 2495414c70cbSLiam Girdwood * regulator_bulk_free - free multiple regulator consumers 2496414c70cbSLiam Girdwood * 2497414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2498414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2499414c70cbSLiam Girdwood * 2500414c70cbSLiam Girdwood * This convenience API allows consumers to free multiple regulator 2501414c70cbSLiam Girdwood * clients in a single API call. 2502414c70cbSLiam Girdwood */ 2503414c70cbSLiam Girdwood void regulator_bulk_free(int num_consumers, 2504414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2505414c70cbSLiam Girdwood { 2506414c70cbSLiam Girdwood int i; 2507414c70cbSLiam Girdwood 2508414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2509414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2510414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2511414c70cbSLiam Girdwood } 2512414c70cbSLiam Girdwood } 2513414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_free); 2514414c70cbSLiam Girdwood 2515414c70cbSLiam Girdwood /** 2516414c70cbSLiam Girdwood * regulator_notifier_call_chain - call regulator event notifier 251769279fb9SMark Brown * @rdev: regulator source 2518414c70cbSLiam Girdwood * @event: notifier block 251969279fb9SMark Brown * @data: callback-specific data. 2520414c70cbSLiam Girdwood * 2521414c70cbSLiam Girdwood * Called by regulator drivers to notify clients a regulator event has 2522414c70cbSLiam Girdwood * occurred. We also notify regulator clients downstream. 2523b136fb44SJonathan Cameron * Note lock must be held by caller. 2524414c70cbSLiam Girdwood */ 2525414c70cbSLiam Girdwood int regulator_notifier_call_chain(struct regulator_dev *rdev, 2526414c70cbSLiam Girdwood unsigned long event, void *data) 2527414c70cbSLiam Girdwood { 2528414c70cbSLiam Girdwood _notifier_call_chain(rdev, event, data); 2529414c70cbSLiam Girdwood return NOTIFY_DONE; 2530414c70cbSLiam Girdwood 2531414c70cbSLiam Girdwood } 2532414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2533414c70cbSLiam Girdwood 2534be721979SMark Brown /** 2535be721979SMark Brown * regulator_mode_to_status - convert a regulator mode into a status 2536be721979SMark Brown * 2537be721979SMark Brown * @mode: Mode to convert 2538be721979SMark Brown * 2539be721979SMark Brown * Convert a regulator mode into a status. 2540be721979SMark Brown */ 2541be721979SMark Brown int regulator_mode_to_status(unsigned int mode) 2542be721979SMark Brown { 2543be721979SMark Brown switch (mode) { 2544be721979SMark Brown case REGULATOR_MODE_FAST: 2545be721979SMark Brown return REGULATOR_STATUS_FAST; 2546be721979SMark Brown case REGULATOR_MODE_NORMAL: 2547be721979SMark Brown return REGULATOR_STATUS_NORMAL; 2548be721979SMark Brown case REGULATOR_MODE_IDLE: 2549be721979SMark Brown return REGULATOR_STATUS_IDLE; 2550be721979SMark Brown case REGULATOR_STATUS_STANDBY: 2551be721979SMark Brown return REGULATOR_STATUS_STANDBY; 2552be721979SMark Brown default: 2553be721979SMark Brown return 0; 2554be721979SMark Brown } 2555be721979SMark Brown } 2556be721979SMark Brown EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2557be721979SMark Brown 25587ad68e2fSDavid Brownell /* 25597ad68e2fSDavid Brownell * To avoid cluttering sysfs (and memory) with useless state, only 25607ad68e2fSDavid Brownell * create attributes that can be meaningfully displayed. 25617ad68e2fSDavid Brownell */ 25627ad68e2fSDavid Brownell static int add_regulator_attributes(struct regulator_dev *rdev) 25637ad68e2fSDavid Brownell { 25647ad68e2fSDavid Brownell struct device *dev = &rdev->dev; 25657ad68e2fSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 25667ad68e2fSDavid Brownell int status = 0; 25677ad68e2fSDavid Brownell 25687ad68e2fSDavid Brownell /* some attributes need specific methods to be displayed */ 25694c78899bSMark Brown if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || 25704c78899bSMark Brown (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { 25717ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microvolts); 25727ad68e2fSDavid Brownell if (status < 0) 25737ad68e2fSDavid Brownell return status; 25747ad68e2fSDavid Brownell } 25757ad68e2fSDavid Brownell if (ops->get_current_limit) { 25767ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microamps); 25777ad68e2fSDavid Brownell if (status < 0) 25787ad68e2fSDavid Brownell return status; 25797ad68e2fSDavid Brownell } 25807ad68e2fSDavid Brownell if (ops->get_mode) { 25817ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_opmode); 25827ad68e2fSDavid Brownell if (status < 0) 25837ad68e2fSDavid Brownell return status; 25847ad68e2fSDavid Brownell } 25857ad68e2fSDavid Brownell if (ops->is_enabled) { 25867ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_state); 25877ad68e2fSDavid Brownell if (status < 0) 25887ad68e2fSDavid Brownell return status; 25897ad68e2fSDavid Brownell } 2590853116a1SDavid Brownell if (ops->get_status) { 2591853116a1SDavid Brownell status = device_create_file(dev, &dev_attr_status); 2592853116a1SDavid Brownell if (status < 0) 2593853116a1SDavid Brownell return status; 2594853116a1SDavid Brownell } 25957ad68e2fSDavid Brownell 25967ad68e2fSDavid Brownell /* some attributes are type-specific */ 25977ad68e2fSDavid Brownell if (rdev->desc->type == REGULATOR_CURRENT) { 25987ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_requested_microamps); 25997ad68e2fSDavid Brownell if (status < 0) 26007ad68e2fSDavid Brownell return status; 26017ad68e2fSDavid Brownell } 26027ad68e2fSDavid Brownell 26037ad68e2fSDavid Brownell /* all the other attributes exist to support constraints; 26047ad68e2fSDavid Brownell * don't show them if there are no constraints, or if the 26057ad68e2fSDavid Brownell * relevant supporting methods are missing. 26067ad68e2fSDavid Brownell */ 26077ad68e2fSDavid Brownell if (!rdev->constraints) 26087ad68e2fSDavid Brownell return status; 26097ad68e2fSDavid Brownell 26107ad68e2fSDavid Brownell /* constraints need specific supporting methods */ 2611e8eef82bSMark Brown if (ops->set_voltage || ops->set_voltage_sel) { 26127ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microvolts); 26137ad68e2fSDavid Brownell if (status < 0) 26147ad68e2fSDavid Brownell return status; 26157ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microvolts); 26167ad68e2fSDavid Brownell if (status < 0) 26177ad68e2fSDavid Brownell return status; 26187ad68e2fSDavid Brownell } 26197ad68e2fSDavid Brownell if (ops->set_current_limit) { 26207ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microamps); 26217ad68e2fSDavid Brownell if (status < 0) 26227ad68e2fSDavid Brownell return status; 26237ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microamps); 26247ad68e2fSDavid Brownell if (status < 0) 26257ad68e2fSDavid Brownell return status; 26267ad68e2fSDavid Brownell } 26277ad68e2fSDavid Brownell 26287ad68e2fSDavid Brownell /* suspend mode constraints need multiple supporting methods */ 26297ad68e2fSDavid Brownell if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 26307ad68e2fSDavid Brownell return status; 26317ad68e2fSDavid Brownell 26327ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_standby_state); 26337ad68e2fSDavid Brownell if (status < 0) 26347ad68e2fSDavid Brownell return status; 26357ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_mem_state); 26367ad68e2fSDavid Brownell if (status < 0) 26377ad68e2fSDavid Brownell return status; 26387ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_disk_state); 26397ad68e2fSDavid Brownell if (status < 0) 26407ad68e2fSDavid Brownell return status; 26417ad68e2fSDavid Brownell 26427ad68e2fSDavid Brownell if (ops->set_suspend_voltage) { 26437ad68e2fSDavid Brownell status = device_create_file(dev, 26447ad68e2fSDavid Brownell &dev_attr_suspend_standby_microvolts); 26457ad68e2fSDavid Brownell if (status < 0) 26467ad68e2fSDavid Brownell return status; 26477ad68e2fSDavid Brownell status = device_create_file(dev, 26487ad68e2fSDavid Brownell &dev_attr_suspend_mem_microvolts); 26497ad68e2fSDavid Brownell if (status < 0) 26507ad68e2fSDavid Brownell return status; 26517ad68e2fSDavid Brownell status = device_create_file(dev, 26527ad68e2fSDavid Brownell &dev_attr_suspend_disk_microvolts); 26537ad68e2fSDavid Brownell if (status < 0) 26547ad68e2fSDavid Brownell return status; 26557ad68e2fSDavid Brownell } 26567ad68e2fSDavid Brownell 26577ad68e2fSDavid Brownell if (ops->set_suspend_mode) { 26587ad68e2fSDavid Brownell status = device_create_file(dev, 26597ad68e2fSDavid Brownell &dev_attr_suspend_standby_mode); 26607ad68e2fSDavid Brownell if (status < 0) 26617ad68e2fSDavid Brownell return status; 26627ad68e2fSDavid Brownell status = device_create_file(dev, 26637ad68e2fSDavid Brownell &dev_attr_suspend_mem_mode); 26647ad68e2fSDavid Brownell if (status < 0) 26657ad68e2fSDavid Brownell return status; 26667ad68e2fSDavid Brownell status = device_create_file(dev, 26677ad68e2fSDavid Brownell &dev_attr_suspend_disk_mode); 26687ad68e2fSDavid Brownell if (status < 0) 26697ad68e2fSDavid Brownell return status; 26707ad68e2fSDavid Brownell } 26717ad68e2fSDavid Brownell 26727ad68e2fSDavid Brownell return status; 26737ad68e2fSDavid Brownell } 26747ad68e2fSDavid Brownell 26751130e5b3SMark Brown static void rdev_init_debugfs(struct regulator_dev *rdev) 26761130e5b3SMark Brown { 26771130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 26781130e5b3SMark Brown rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 26791130e5b3SMark Brown if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 26801130e5b3SMark Brown rdev_warn(rdev, "Failed to create debugfs directory\n"); 26811130e5b3SMark Brown rdev->debugfs = NULL; 26821130e5b3SMark Brown return; 26831130e5b3SMark Brown } 26841130e5b3SMark Brown 26851130e5b3SMark Brown debugfs_create_u32("use_count", 0444, rdev->debugfs, 26861130e5b3SMark Brown &rdev->use_count); 26871130e5b3SMark Brown debugfs_create_u32("open_count", 0444, rdev->debugfs, 26881130e5b3SMark Brown &rdev->open_count); 26891130e5b3SMark Brown #endif 26901130e5b3SMark Brown } 26911130e5b3SMark Brown 2692414c70cbSLiam Girdwood /** 2693414c70cbSLiam Girdwood * regulator_register - register regulator 269469279fb9SMark Brown * @regulator_desc: regulator to register 269569279fb9SMark Brown * @dev: struct device for the regulator 26960527100fSMark Brown * @init_data: platform provided init data, passed through by driver 269769279fb9SMark Brown * @driver_data: private regulator data 2698414c70cbSLiam Girdwood * 2699414c70cbSLiam Girdwood * Called by regulator drivers to register a regulator. 2700414c70cbSLiam Girdwood * Returns 0 on success. 2701414c70cbSLiam Girdwood */ 2702414c70cbSLiam Girdwood struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2703f8c12fe3SMark Brown struct device *dev, const struct regulator_init_data *init_data, 27042c043bcbSRajendra Nayak void *driver_data, struct device_node *of_node) 2705414c70cbSLiam Girdwood { 27069a8f5e07SMark Brown const struct regulation_constraints *constraints = NULL; 2707414c70cbSLiam Girdwood static atomic_t regulator_no = ATOMIC_INIT(0); 2708414c70cbSLiam Girdwood struct regulator_dev *rdev; 2709a5766f11SLiam Girdwood int ret, i; 271069511a45SRajendra Nayak const char *supply = NULL; 2711414c70cbSLiam Girdwood 2712414c70cbSLiam Girdwood if (regulator_desc == NULL) 2713414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2714414c70cbSLiam Girdwood 2715414c70cbSLiam Girdwood if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2716414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2717414c70cbSLiam Girdwood 2718cd78dfc6SDiego Liziero if (regulator_desc->type != REGULATOR_VOLTAGE && 2719cd78dfc6SDiego Liziero regulator_desc->type != REGULATOR_CURRENT) 2720414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2721414c70cbSLiam Girdwood 2722476c2d83SMark Brown /* Only one of each should be implemented */ 2723476c2d83SMark Brown WARN_ON(regulator_desc->ops->get_voltage && 2724476c2d83SMark Brown regulator_desc->ops->get_voltage_sel); 2725e8eef82bSMark Brown WARN_ON(regulator_desc->ops->set_voltage && 2726e8eef82bSMark Brown regulator_desc->ops->set_voltage_sel); 2727476c2d83SMark Brown 2728476c2d83SMark Brown /* If we're using selectors we must implement list_voltage. */ 2729476c2d83SMark Brown if (regulator_desc->ops->get_voltage_sel && 2730476c2d83SMark Brown !regulator_desc->ops->list_voltage) { 2731476c2d83SMark Brown return ERR_PTR(-EINVAL); 2732476c2d83SMark Brown } 2733e8eef82bSMark Brown if (regulator_desc->ops->set_voltage_sel && 2734e8eef82bSMark Brown !regulator_desc->ops->list_voltage) { 2735e8eef82bSMark Brown return ERR_PTR(-EINVAL); 2736e8eef82bSMark Brown } 2737476c2d83SMark Brown 2738414c70cbSLiam Girdwood rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2739414c70cbSLiam Girdwood if (rdev == NULL) 2740414c70cbSLiam Girdwood return ERR_PTR(-ENOMEM); 2741414c70cbSLiam Girdwood 2742414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2743414c70cbSLiam Girdwood 2744414c70cbSLiam Girdwood mutex_init(&rdev->mutex); 2745a5766f11SLiam Girdwood rdev->reg_data = driver_data; 2746414c70cbSLiam Girdwood rdev->owner = regulator_desc->owner; 2747414c70cbSLiam Girdwood rdev->desc = regulator_desc; 2748414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->consumer_list); 2749414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->list); 2750414c70cbSLiam Girdwood BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2751da07ecd9SMark Brown INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2752414c70cbSLiam Girdwood 2753a5766f11SLiam Girdwood /* preform any regulator specific init */ 27549a8f5e07SMark Brown if (init_data && init_data->regulator_init) { 2755a5766f11SLiam Girdwood ret = init_data->regulator_init(rdev->reg_data); 27564fca9545SDavid Brownell if (ret < 0) 27574fca9545SDavid Brownell goto clean; 2758a5766f11SLiam Girdwood } 2759a5766f11SLiam Girdwood 2760a5766f11SLiam Girdwood /* register with sysfs */ 2761a5766f11SLiam Girdwood rdev->dev.class = ®ulator_class; 27622c043bcbSRajendra Nayak rdev->dev.of_node = of_node; 2763a5766f11SLiam Girdwood rdev->dev.parent = dev; 2764812460a9SKay Sievers dev_set_name(&rdev->dev, "regulator.%d", 2765812460a9SKay Sievers atomic_inc_return(®ulator_no) - 1); 2766a5766f11SLiam Girdwood ret = device_register(&rdev->dev); 2767ad7725cbSVasiliy Kulikov if (ret != 0) { 2768ad7725cbSVasiliy Kulikov put_device(&rdev->dev); 27694fca9545SDavid Brownell goto clean; 2770ad7725cbSVasiliy Kulikov } 2771a5766f11SLiam Girdwood 2772a5766f11SLiam Girdwood dev_set_drvdata(&rdev->dev, rdev); 2773a5766f11SLiam Girdwood 277474f544c1SMike Rapoport /* set regulator constraints */ 27759a8f5e07SMark Brown if (init_data) 27769a8f5e07SMark Brown constraints = &init_data->constraints; 27779a8f5e07SMark Brown 27789a8f5e07SMark Brown ret = set_machine_constraints(rdev, constraints); 277974f544c1SMike Rapoport if (ret < 0) 278074f544c1SMike Rapoport goto scrub; 278174f544c1SMike Rapoport 27827ad68e2fSDavid Brownell /* add attributes supported by this regulator */ 27837ad68e2fSDavid Brownell ret = add_regulator_attributes(rdev); 27847ad68e2fSDavid Brownell if (ret < 0) 27857ad68e2fSDavid Brownell goto scrub; 27867ad68e2fSDavid Brownell 27879a8f5e07SMark Brown if (init_data && init_data->supply_regulator) 278869511a45SRajendra Nayak supply = init_data->supply_regulator; 278969511a45SRajendra Nayak else if (regulator_desc->supply_name) 279069511a45SRajendra Nayak supply = regulator_desc->supply_name; 279169511a45SRajendra Nayak 279269511a45SRajendra Nayak if (supply) { 27930178f3e2SMark Brown struct regulator_dev *r; 27940178f3e2SMark Brown 279569511a45SRajendra Nayak r = regulator_dev_lookup(dev, supply); 27960178f3e2SMark Brown 279769511a45SRajendra Nayak if (!r) { 279869511a45SRajendra Nayak dev_err(dev, "Failed to find supply %s\n", supply); 27997727da22SAxel Lin ret = -ENODEV; 28000178f3e2SMark Brown goto scrub; 28010178f3e2SMark Brown } 28020178f3e2SMark Brown 28030178f3e2SMark Brown ret = set_supply(rdev, r); 28040178f3e2SMark Brown if (ret < 0) 28050178f3e2SMark Brown goto scrub; 28060178f3e2SMark Brown } 28070178f3e2SMark Brown 2808a5766f11SLiam Girdwood /* add consumers devices */ 28099a8f5e07SMark Brown if (init_data) { 2810a5766f11SLiam Girdwood for (i = 0; i < init_data->num_consumer_supplies; i++) { 2811a5766f11SLiam Girdwood ret = set_consumer_device_supply(rdev, 2812a5766f11SLiam Girdwood init_data->consumer_supplies[i].dev, 281340f9244fSMark Brown init_data->consumer_supplies[i].dev_name, 2814a5766f11SLiam Girdwood init_data->consumer_supplies[i].supply); 281523c2f041SMark Brown if (ret < 0) { 281623c2f041SMark Brown dev_err(dev, "Failed to set supply %s\n", 281723c2f041SMark Brown init_data->consumer_supplies[i].supply); 2818d4033b54SJani Nikula goto unset_supplies; 2819a5766f11SLiam Girdwood } 282023c2f041SMark Brown } 28219a8f5e07SMark Brown } 2822a5766f11SLiam Girdwood 2823a5766f11SLiam Girdwood list_add(&rdev->list, ®ulator_list); 28241130e5b3SMark Brown 28251130e5b3SMark Brown rdev_init_debugfs(rdev); 2826a5766f11SLiam Girdwood out: 2827414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2828414c70cbSLiam Girdwood return rdev; 28294fca9545SDavid Brownell 2830d4033b54SJani Nikula unset_supplies: 2831d4033b54SJani Nikula unset_regulator_supplies(rdev); 2832d4033b54SJani Nikula 28334fca9545SDavid Brownell scrub: 28341a6958e7SAxel Lin kfree(rdev->constraints); 28354fca9545SDavid Brownell device_unregister(&rdev->dev); 283653032dafSPaul Walmsley /* device core frees rdev */ 283753032dafSPaul Walmsley rdev = ERR_PTR(ret); 283853032dafSPaul Walmsley goto out; 283953032dafSPaul Walmsley 28404fca9545SDavid Brownell clean: 28414fca9545SDavid Brownell kfree(rdev); 28424fca9545SDavid Brownell rdev = ERR_PTR(ret); 28434fca9545SDavid Brownell goto out; 2844414c70cbSLiam Girdwood } 2845414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register); 2846414c70cbSLiam Girdwood 2847414c70cbSLiam Girdwood /** 2848414c70cbSLiam Girdwood * regulator_unregister - unregister regulator 284969279fb9SMark Brown * @rdev: regulator to unregister 2850414c70cbSLiam Girdwood * 2851414c70cbSLiam Girdwood * Called by regulator drivers to unregister a regulator. 2852414c70cbSLiam Girdwood */ 2853414c70cbSLiam Girdwood void regulator_unregister(struct regulator_dev *rdev) 2854414c70cbSLiam Girdwood { 2855414c70cbSLiam Girdwood if (rdev == NULL) 2856414c70cbSLiam Girdwood return; 2857414c70cbSLiam Girdwood 2858414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 28591130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 28601130e5b3SMark Brown debugfs_remove_recursive(rdev->debugfs); 28611130e5b3SMark Brown #endif 2862da07ecd9SMark Brown flush_work_sync(&rdev->disable_work.work); 28636bf87d17SMark Brown WARN_ON(rdev->open_count); 28640f1d747bSMike Rapoport unset_regulator_supplies(rdev); 2865414c70cbSLiam Girdwood list_del(&rdev->list); 2866414c70cbSLiam Girdwood if (rdev->supply) 28673801b86aSMark Brown regulator_put(rdev->supply); 2868f8c12fe3SMark Brown kfree(rdev->constraints); 286958fb5cf5SLothar Waßmann device_unregister(&rdev->dev); 2870414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2871414c70cbSLiam Girdwood } 2872414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister); 2873414c70cbSLiam Girdwood 2874414c70cbSLiam Girdwood /** 2875cf7bbcdfSMark Brown * regulator_suspend_prepare - prepare regulators for system wide suspend 2876414c70cbSLiam Girdwood * @state: system suspend state 2877414c70cbSLiam Girdwood * 2878414c70cbSLiam Girdwood * Configure each regulator with it's suspend operating parameters for state. 2879414c70cbSLiam Girdwood * This will usually be called by machine suspend code prior to supending. 2880414c70cbSLiam Girdwood */ 2881414c70cbSLiam Girdwood int regulator_suspend_prepare(suspend_state_t state) 2882414c70cbSLiam Girdwood { 2883414c70cbSLiam Girdwood struct regulator_dev *rdev; 2884414c70cbSLiam Girdwood int ret = 0; 2885414c70cbSLiam Girdwood 2886414c70cbSLiam Girdwood /* ON is handled by regulator active state */ 2887414c70cbSLiam Girdwood if (state == PM_SUSPEND_ON) 2888414c70cbSLiam Girdwood return -EINVAL; 2889414c70cbSLiam Girdwood 2890414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2891414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 2892414c70cbSLiam Girdwood 2893414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2894414c70cbSLiam Girdwood ret = suspend_prepare(rdev, state); 2895414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2896414c70cbSLiam Girdwood 2897414c70cbSLiam Girdwood if (ret < 0) { 28985da84fd9SJoe Perches rdev_err(rdev, "failed to prepare\n"); 2899414c70cbSLiam Girdwood goto out; 2900414c70cbSLiam Girdwood } 2901414c70cbSLiam Girdwood } 2902414c70cbSLiam Girdwood out: 2903414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2904414c70cbSLiam Girdwood return ret; 2905414c70cbSLiam Girdwood } 2906414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2907414c70cbSLiam Girdwood 2908414c70cbSLiam Girdwood /** 29097a32b589SMyungJoo Ham * regulator_suspend_finish - resume regulators from system wide suspend 29107a32b589SMyungJoo Ham * 29117a32b589SMyungJoo Ham * Turn on regulators that might be turned off by regulator_suspend_prepare 29127a32b589SMyungJoo Ham * and that should be turned on according to the regulators properties. 29137a32b589SMyungJoo Ham */ 29147a32b589SMyungJoo Ham int regulator_suspend_finish(void) 29157a32b589SMyungJoo Ham { 29167a32b589SMyungJoo Ham struct regulator_dev *rdev; 29177a32b589SMyungJoo Ham int ret = 0, error; 29187a32b589SMyungJoo Ham 29197a32b589SMyungJoo Ham mutex_lock(®ulator_list_mutex); 29207a32b589SMyungJoo Ham list_for_each_entry(rdev, ®ulator_list, list) { 29217a32b589SMyungJoo Ham struct regulator_ops *ops = rdev->desc->ops; 29227a32b589SMyungJoo Ham 29237a32b589SMyungJoo Ham mutex_lock(&rdev->mutex); 29247a32b589SMyungJoo Ham if ((rdev->use_count > 0 || rdev->constraints->always_on) && 29257a32b589SMyungJoo Ham ops->enable) { 29267a32b589SMyungJoo Ham error = ops->enable(rdev); 29277a32b589SMyungJoo Ham if (error) 29287a32b589SMyungJoo Ham ret = error; 29297a32b589SMyungJoo Ham } else { 29307a32b589SMyungJoo Ham if (!has_full_constraints) 29317a32b589SMyungJoo Ham goto unlock; 29327a32b589SMyungJoo Ham if (!ops->disable) 29337a32b589SMyungJoo Ham goto unlock; 29347a32b589SMyungJoo Ham if (ops->is_enabled && !ops->is_enabled(rdev)) 29357a32b589SMyungJoo Ham goto unlock; 29367a32b589SMyungJoo Ham 29377a32b589SMyungJoo Ham error = ops->disable(rdev); 29387a32b589SMyungJoo Ham if (error) 29397a32b589SMyungJoo Ham ret = error; 29407a32b589SMyungJoo Ham } 29417a32b589SMyungJoo Ham unlock: 29427a32b589SMyungJoo Ham mutex_unlock(&rdev->mutex); 29437a32b589SMyungJoo Ham } 29447a32b589SMyungJoo Ham mutex_unlock(®ulator_list_mutex); 29457a32b589SMyungJoo Ham return ret; 29467a32b589SMyungJoo Ham } 29477a32b589SMyungJoo Ham EXPORT_SYMBOL_GPL(regulator_suspend_finish); 29487a32b589SMyungJoo Ham 29497a32b589SMyungJoo Ham /** 2950ca725561SMark Brown * regulator_has_full_constraints - the system has fully specified constraints 2951ca725561SMark Brown * 2952ca725561SMark Brown * Calling this function will cause the regulator API to disable all 2953ca725561SMark Brown * regulators which have a zero use count and don't have an always_on 2954ca725561SMark Brown * constraint in a late_initcall. 2955ca725561SMark Brown * 2956ca725561SMark Brown * The intention is that this will become the default behaviour in a 2957ca725561SMark Brown * future kernel release so users are encouraged to use this facility 2958ca725561SMark Brown * now. 2959ca725561SMark Brown */ 2960ca725561SMark Brown void regulator_has_full_constraints(void) 2961ca725561SMark Brown { 2962ca725561SMark Brown has_full_constraints = 1; 2963ca725561SMark Brown } 2964ca725561SMark Brown EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2965ca725561SMark Brown 2966ca725561SMark Brown /** 2967688fe99aSMark Brown * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2968688fe99aSMark Brown * 2969688fe99aSMark Brown * Calling this function will cause the regulator API to provide a 2970688fe99aSMark Brown * dummy regulator to consumers if no physical regulator is found, 2971688fe99aSMark Brown * allowing most consumers to proceed as though a regulator were 2972688fe99aSMark Brown * configured. This allows systems such as those with software 2973688fe99aSMark Brown * controllable regulators for the CPU core only to be brought up more 2974688fe99aSMark Brown * readily. 2975688fe99aSMark Brown */ 2976688fe99aSMark Brown void regulator_use_dummy_regulator(void) 2977688fe99aSMark Brown { 2978688fe99aSMark Brown board_wants_dummy_regulator = true; 2979688fe99aSMark Brown } 2980688fe99aSMark Brown EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2981688fe99aSMark Brown 2982688fe99aSMark Brown /** 2983414c70cbSLiam Girdwood * rdev_get_drvdata - get rdev regulator driver data 298469279fb9SMark Brown * @rdev: regulator 2985414c70cbSLiam Girdwood * 2986414c70cbSLiam Girdwood * Get rdev regulator driver private data. This call can be used in the 2987414c70cbSLiam Girdwood * regulator driver context. 2988414c70cbSLiam Girdwood */ 2989414c70cbSLiam Girdwood void *rdev_get_drvdata(struct regulator_dev *rdev) 2990414c70cbSLiam Girdwood { 2991414c70cbSLiam Girdwood return rdev->reg_data; 2992414c70cbSLiam Girdwood } 2993414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2994414c70cbSLiam Girdwood 2995414c70cbSLiam Girdwood /** 2996414c70cbSLiam Girdwood * regulator_get_drvdata - get regulator driver data 2997414c70cbSLiam Girdwood * @regulator: regulator 2998414c70cbSLiam Girdwood * 2999414c70cbSLiam Girdwood * Get regulator driver private data. This call can be used in the consumer 3000414c70cbSLiam Girdwood * driver context when non API regulator specific functions need to be called. 3001414c70cbSLiam Girdwood */ 3002414c70cbSLiam Girdwood void *regulator_get_drvdata(struct regulator *regulator) 3003414c70cbSLiam Girdwood { 3004414c70cbSLiam Girdwood return regulator->rdev->reg_data; 3005414c70cbSLiam Girdwood } 3006414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_drvdata); 3007414c70cbSLiam Girdwood 3008414c70cbSLiam Girdwood /** 3009414c70cbSLiam Girdwood * regulator_set_drvdata - set regulator driver data 3010414c70cbSLiam Girdwood * @regulator: regulator 3011414c70cbSLiam Girdwood * @data: data 3012414c70cbSLiam Girdwood */ 3013414c70cbSLiam Girdwood void regulator_set_drvdata(struct regulator *regulator, void *data) 3014414c70cbSLiam Girdwood { 3015414c70cbSLiam Girdwood regulator->rdev->reg_data = data; 3016414c70cbSLiam Girdwood } 3017414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_drvdata); 3018414c70cbSLiam Girdwood 3019414c70cbSLiam Girdwood /** 3020414c70cbSLiam Girdwood * regulator_get_id - get regulator ID 302169279fb9SMark Brown * @rdev: regulator 3022414c70cbSLiam Girdwood */ 3023414c70cbSLiam Girdwood int rdev_get_id(struct regulator_dev *rdev) 3024414c70cbSLiam Girdwood { 3025414c70cbSLiam Girdwood return rdev->desc->id; 3026414c70cbSLiam Girdwood } 3027414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_id); 3028414c70cbSLiam Girdwood 3029a5766f11SLiam Girdwood struct device *rdev_get_dev(struct regulator_dev *rdev) 3030a5766f11SLiam Girdwood { 3031a5766f11SLiam Girdwood return &rdev->dev; 3032a5766f11SLiam Girdwood } 3033a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_dev); 3034a5766f11SLiam Girdwood 3035a5766f11SLiam Girdwood void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 3036a5766f11SLiam Girdwood { 3037a5766f11SLiam Girdwood return reg_init_data->driver_data; 3038a5766f11SLiam Girdwood } 3039a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 3040a5766f11SLiam Girdwood 3041ba55a974SMark Brown #ifdef CONFIG_DEBUG_FS 3042ba55a974SMark Brown static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 3043ba55a974SMark Brown size_t count, loff_t *ppos) 3044ba55a974SMark Brown { 3045ba55a974SMark Brown char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 3046ba55a974SMark Brown ssize_t len, ret = 0; 3047ba55a974SMark Brown struct regulator_map *map; 3048ba55a974SMark Brown 3049ba55a974SMark Brown if (!buf) 3050ba55a974SMark Brown return -ENOMEM; 3051ba55a974SMark Brown 3052ba55a974SMark Brown list_for_each_entry(map, ®ulator_map_list, list) { 3053ba55a974SMark Brown len = snprintf(buf + ret, PAGE_SIZE - ret, 3054ba55a974SMark Brown "%s -> %s.%s\n", 3055ba55a974SMark Brown rdev_get_name(map->regulator), map->dev_name, 3056ba55a974SMark Brown map->supply); 3057ba55a974SMark Brown if (len >= 0) 3058ba55a974SMark Brown ret += len; 3059ba55a974SMark Brown if (ret > PAGE_SIZE) { 3060ba55a974SMark Brown ret = PAGE_SIZE; 3061ba55a974SMark Brown break; 3062ba55a974SMark Brown } 3063ba55a974SMark Brown } 3064ba55a974SMark Brown 3065ba55a974SMark Brown ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3066ba55a974SMark Brown 3067ba55a974SMark Brown kfree(buf); 3068ba55a974SMark Brown 3069ba55a974SMark Brown return ret; 3070ba55a974SMark Brown } 3071ba55a974SMark Brown 3072ba55a974SMark Brown static const struct file_operations supply_map_fops = { 3073ba55a974SMark Brown .read = supply_map_read_file, 3074ba55a974SMark Brown .llseek = default_llseek, 3075ba55a974SMark Brown }; 3076ba55a974SMark Brown #endif 3077ba55a974SMark Brown 3078414c70cbSLiam Girdwood static int __init regulator_init(void) 3079414c70cbSLiam Girdwood { 308034abbd68SMark Brown int ret; 308134abbd68SMark Brown 308234abbd68SMark Brown ret = class_register(®ulator_class); 308334abbd68SMark Brown 30841130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 30851130e5b3SMark Brown debugfs_root = debugfs_create_dir("regulator", NULL); 30861130e5b3SMark Brown if (IS_ERR(debugfs_root) || !debugfs_root) { 30871130e5b3SMark Brown pr_warn("regulator: Failed to create debugfs directory\n"); 30881130e5b3SMark Brown debugfs_root = NULL; 30891130e5b3SMark Brown } 3090ba55a974SMark Brown 3091ba55a974SMark Brown if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3092ba55a974SMark Brown NULL, &supply_map_fops))) 3093ba55a974SMark Brown pr_warn("regulator: Failed to create supplies debugfs\n"); 30941130e5b3SMark Brown #endif 30951130e5b3SMark Brown 309634abbd68SMark Brown regulator_dummy_init(); 309734abbd68SMark Brown 309834abbd68SMark Brown return ret; 3099414c70cbSLiam Girdwood } 3100414c70cbSLiam Girdwood 3101414c70cbSLiam Girdwood /* init early to allow our consumers to complete system booting */ 3102414c70cbSLiam Girdwood core_initcall(regulator_init); 3103ca725561SMark Brown 3104ca725561SMark Brown static int __init regulator_init_complete(void) 3105ca725561SMark Brown { 3106ca725561SMark Brown struct regulator_dev *rdev; 3107ca725561SMark Brown struct regulator_ops *ops; 3108ca725561SMark Brown struct regulation_constraints *c; 3109ca725561SMark Brown int enabled, ret; 3110ca725561SMark Brown 3111ca725561SMark Brown mutex_lock(®ulator_list_mutex); 3112ca725561SMark Brown 3113ca725561SMark Brown /* If we have a full configuration then disable any regulators 3114ca725561SMark Brown * which are not in use or always_on. This will become the 3115ca725561SMark Brown * default behaviour in the future. 3116ca725561SMark Brown */ 3117ca725561SMark Brown list_for_each_entry(rdev, ®ulator_list, list) { 3118ca725561SMark Brown ops = rdev->desc->ops; 3119ca725561SMark Brown c = rdev->constraints; 3120ca725561SMark Brown 3121f25e0b4fSMark Brown if (!ops->disable || (c && c->always_on)) 3122ca725561SMark Brown continue; 3123ca725561SMark Brown 3124ca725561SMark Brown mutex_lock(&rdev->mutex); 3125ca725561SMark Brown 3126ca725561SMark Brown if (rdev->use_count) 3127ca725561SMark Brown goto unlock; 3128ca725561SMark Brown 3129ca725561SMark Brown /* If we can't read the status assume it's on. */ 3130ca725561SMark Brown if (ops->is_enabled) 3131ca725561SMark Brown enabled = ops->is_enabled(rdev); 3132ca725561SMark Brown else 3133ca725561SMark Brown enabled = 1; 3134ca725561SMark Brown 3135ca725561SMark Brown if (!enabled) 3136ca725561SMark Brown goto unlock; 3137ca725561SMark Brown 3138ca725561SMark Brown if (has_full_constraints) { 3139ca725561SMark Brown /* We log since this may kill the system if it 3140ca725561SMark Brown * goes wrong. */ 31415da84fd9SJoe Perches rdev_info(rdev, "disabling\n"); 3142ca725561SMark Brown ret = ops->disable(rdev); 3143ca725561SMark Brown if (ret != 0) { 31445da84fd9SJoe Perches rdev_err(rdev, "couldn't disable: %d\n", ret); 3145ca725561SMark Brown } 3146ca725561SMark Brown } else { 3147ca725561SMark Brown /* The intention is that in future we will 3148ca725561SMark Brown * assume that full constraints are provided 3149ca725561SMark Brown * so warn even if we aren't going to do 3150ca725561SMark Brown * anything here. 3151ca725561SMark Brown */ 31525da84fd9SJoe Perches rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3153ca725561SMark Brown } 3154ca725561SMark Brown 3155ca725561SMark Brown unlock: 3156ca725561SMark Brown mutex_unlock(&rdev->mutex); 3157ca725561SMark Brown } 3158ca725561SMark Brown 3159ca725561SMark Brown mutex_unlock(®ulator_list_mutex); 3160ca725561SMark Brown 3161ca725561SMark Brown return 0; 3162ca725561SMark Brown } 3163ca725561SMark Brown late_initcall(regulator_init_complete); 3164