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> 28414c70cbSLiam Girdwood #include <linux/regulator/consumer.h> 29414c70cbSLiam Girdwood #include <linux/regulator/driver.h> 30414c70cbSLiam Girdwood #include <linux/regulator/machine.h> 3165602c32SPaul Gortmaker #include <linux/module.h> 32414c70cbSLiam Girdwood 3302fa3ec0SMark Brown #define CREATE_TRACE_POINTS 3402fa3ec0SMark Brown #include <trace/events/regulator.h> 3502fa3ec0SMark Brown 3634abbd68SMark Brown #include "dummy.h" 3734abbd68SMark Brown 387d51a0dbSMark Brown #define rdev_crit(rdev, fmt, ...) \ 397d51a0dbSMark Brown pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 405da84fd9SJoe Perches #define rdev_err(rdev, fmt, ...) \ 415da84fd9SJoe Perches pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 425da84fd9SJoe Perches #define rdev_warn(rdev, fmt, ...) \ 435da84fd9SJoe Perches pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 445da84fd9SJoe Perches #define rdev_info(rdev, fmt, ...) \ 455da84fd9SJoe Perches pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 465da84fd9SJoe Perches #define rdev_dbg(rdev, fmt, ...) \ 475da84fd9SJoe Perches pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) 485da84fd9SJoe Perches 49414c70cbSLiam Girdwood static DEFINE_MUTEX(regulator_list_mutex); 50414c70cbSLiam Girdwood static LIST_HEAD(regulator_list); 51414c70cbSLiam Girdwood static LIST_HEAD(regulator_map_list); 5221cf891aSMark Brown static bool has_full_constraints; 53688fe99aSMark Brown static bool board_wants_dummy_regulator; 54414c70cbSLiam Girdwood 551130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 561130e5b3SMark Brown static struct dentry *debugfs_root; 571130e5b3SMark Brown #endif 581130e5b3SMark Brown 598dc5390dSMark Brown /* 60414c70cbSLiam Girdwood * struct regulator_map 61414c70cbSLiam Girdwood * 62414c70cbSLiam Girdwood * Used to provide symbolic supply names to devices. 63414c70cbSLiam Girdwood */ 64414c70cbSLiam Girdwood struct regulator_map { 65414c70cbSLiam Girdwood struct list_head list; 6640f9244fSMark Brown const char *dev_name; /* The dev_name() for the consumer */ 67414c70cbSLiam Girdwood const char *supply; 68a5766f11SLiam Girdwood struct regulator_dev *regulator; 69414c70cbSLiam Girdwood }; 70414c70cbSLiam Girdwood 71414c70cbSLiam Girdwood /* 72414c70cbSLiam Girdwood * struct regulator 73414c70cbSLiam Girdwood * 74414c70cbSLiam Girdwood * One for each consumer device. 75414c70cbSLiam Girdwood */ 76414c70cbSLiam Girdwood struct regulator { 77414c70cbSLiam Girdwood struct device *dev; 78414c70cbSLiam Girdwood struct list_head list; 79414c70cbSLiam Girdwood int uA_load; 80414c70cbSLiam Girdwood int min_uV; 81414c70cbSLiam Girdwood int max_uV; 82414c70cbSLiam Girdwood char *supply_name; 83414c70cbSLiam Girdwood struct device_attribute dev_attr; 84414c70cbSLiam Girdwood struct regulator_dev *rdev; 855de70519SMark Brown #ifdef CONFIG_DEBUG_FS 865de70519SMark Brown struct dentry *debugfs; 875de70519SMark Brown #endif 88414c70cbSLiam Girdwood }; 89414c70cbSLiam Girdwood 90414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev); 913801b86aSMark Brown static int _regulator_disable(struct regulator_dev *rdev); 92414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev); 93414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev); 94414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 95414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 96414c70cbSLiam Girdwood unsigned long event, void *data); 9775790251SMark Brown static int _regulator_do_set_voltage(struct regulator_dev *rdev, 9875790251SMark Brown int min_uV, int max_uV); 993801b86aSMark Brown static struct regulator *create_regulator(struct regulator_dev *rdev, 1003801b86aSMark Brown struct device *dev, 1013801b86aSMark Brown const char *supply_name); 102414c70cbSLiam Girdwood 1031083c393SMark Brown static const char *rdev_get_name(struct regulator_dev *rdev) 1041083c393SMark Brown { 1051083c393SMark Brown if (rdev->constraints && rdev->constraints->name) 1061083c393SMark Brown return rdev->constraints->name; 1071083c393SMark Brown else if (rdev->desc->name) 1081083c393SMark Brown return rdev->desc->name; 1091083c393SMark Brown else 1101083c393SMark Brown return ""; 1111083c393SMark Brown } 1121083c393SMark Brown 113414c70cbSLiam Girdwood /* gets the regulator for a given consumer device */ 114414c70cbSLiam Girdwood static struct regulator *get_device_regulator(struct device *dev) 115414c70cbSLiam Girdwood { 116414c70cbSLiam Girdwood struct regulator *regulator = NULL; 117414c70cbSLiam Girdwood struct regulator_dev *rdev; 118414c70cbSLiam Girdwood 119414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 120414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 121414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 122414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) { 123414c70cbSLiam Girdwood if (regulator->dev == dev) { 124414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 125414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 126414c70cbSLiam Girdwood return regulator; 127414c70cbSLiam Girdwood } 128414c70cbSLiam Girdwood } 129414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 130414c70cbSLiam Girdwood } 131414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 132414c70cbSLiam Girdwood return NULL; 133414c70cbSLiam Girdwood } 134414c70cbSLiam Girdwood 135414c70cbSLiam Girdwood /* Platform voltage constraint check */ 136414c70cbSLiam Girdwood static int regulator_check_voltage(struct regulator_dev *rdev, 137414c70cbSLiam Girdwood int *min_uV, int *max_uV) 138414c70cbSLiam Girdwood { 139414c70cbSLiam Girdwood BUG_ON(*min_uV > *max_uV); 140414c70cbSLiam Girdwood 141414c70cbSLiam Girdwood if (!rdev->constraints) { 1425da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 143414c70cbSLiam Girdwood return -ENODEV; 144414c70cbSLiam Girdwood } 145414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 1465da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 147414c70cbSLiam Girdwood return -EPERM; 148414c70cbSLiam Girdwood } 149414c70cbSLiam Girdwood 150414c70cbSLiam Girdwood if (*max_uV > rdev->constraints->max_uV) 151414c70cbSLiam Girdwood *max_uV = rdev->constraints->max_uV; 152414c70cbSLiam Girdwood if (*min_uV < rdev->constraints->min_uV) 153414c70cbSLiam Girdwood *min_uV = rdev->constraints->min_uV; 154414c70cbSLiam Girdwood 15589f425edSMark Brown if (*min_uV > *max_uV) { 15689f425edSMark Brown rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", 15754abd335SMark Brown *min_uV, *max_uV); 158414c70cbSLiam Girdwood return -EINVAL; 15989f425edSMark Brown } 160414c70cbSLiam Girdwood 161414c70cbSLiam Girdwood return 0; 162414c70cbSLiam Girdwood } 163414c70cbSLiam Girdwood 16405fda3b1SThomas Petazzoni /* Make sure we select a voltage that suits the needs of all 16505fda3b1SThomas Petazzoni * regulator consumers 16605fda3b1SThomas Petazzoni */ 16705fda3b1SThomas Petazzoni static int regulator_check_consumers(struct regulator_dev *rdev, 16805fda3b1SThomas Petazzoni int *min_uV, int *max_uV) 16905fda3b1SThomas Petazzoni { 17005fda3b1SThomas Petazzoni struct regulator *regulator; 17105fda3b1SThomas Petazzoni 17205fda3b1SThomas Petazzoni list_for_each_entry(regulator, &rdev->consumer_list, list) { 1734aa922c0SMark Brown /* 1744aa922c0SMark Brown * Assume consumers that didn't say anything are OK 1754aa922c0SMark Brown * with anything in the constraint range. 1764aa922c0SMark Brown */ 1774aa922c0SMark Brown if (!regulator->min_uV && !regulator->max_uV) 1784aa922c0SMark Brown continue; 1794aa922c0SMark Brown 18005fda3b1SThomas Petazzoni if (*max_uV > regulator->max_uV) 18105fda3b1SThomas Petazzoni *max_uV = regulator->max_uV; 18205fda3b1SThomas Petazzoni if (*min_uV < regulator->min_uV) 18305fda3b1SThomas Petazzoni *min_uV = regulator->min_uV; 18405fda3b1SThomas Petazzoni } 18505fda3b1SThomas Petazzoni 18605fda3b1SThomas Petazzoni if (*min_uV > *max_uV) 18705fda3b1SThomas Petazzoni return -EINVAL; 18805fda3b1SThomas Petazzoni 18905fda3b1SThomas Petazzoni return 0; 19005fda3b1SThomas Petazzoni } 19105fda3b1SThomas Petazzoni 192414c70cbSLiam Girdwood /* current constraint check */ 193414c70cbSLiam Girdwood static int regulator_check_current_limit(struct regulator_dev *rdev, 194414c70cbSLiam Girdwood int *min_uA, int *max_uA) 195414c70cbSLiam Girdwood { 196414c70cbSLiam Girdwood BUG_ON(*min_uA > *max_uA); 197414c70cbSLiam Girdwood 198414c70cbSLiam Girdwood if (!rdev->constraints) { 1995da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 200414c70cbSLiam Girdwood return -ENODEV; 201414c70cbSLiam Girdwood } 202414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 2035da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 204414c70cbSLiam Girdwood return -EPERM; 205414c70cbSLiam Girdwood } 206414c70cbSLiam Girdwood 207414c70cbSLiam Girdwood if (*max_uA > rdev->constraints->max_uA) 208414c70cbSLiam Girdwood *max_uA = rdev->constraints->max_uA; 209414c70cbSLiam Girdwood if (*min_uA < rdev->constraints->min_uA) 210414c70cbSLiam Girdwood *min_uA = rdev->constraints->min_uA; 211414c70cbSLiam Girdwood 21289f425edSMark Brown if (*min_uA > *max_uA) { 21389f425edSMark Brown rdev_err(rdev, "unsupportable current range: %d-%duA\n", 21454abd335SMark Brown *min_uA, *max_uA); 215414c70cbSLiam Girdwood return -EINVAL; 21689f425edSMark Brown } 217414c70cbSLiam Girdwood 218414c70cbSLiam Girdwood return 0; 219414c70cbSLiam Girdwood } 220414c70cbSLiam Girdwood 221414c70cbSLiam Girdwood /* operating mode constraint check */ 2222c608234SMark Brown static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) 223414c70cbSLiam Girdwood { 2242c608234SMark Brown switch (*mode) { 225e573520bSDavid Brownell case REGULATOR_MODE_FAST: 226e573520bSDavid Brownell case REGULATOR_MODE_NORMAL: 227e573520bSDavid Brownell case REGULATOR_MODE_IDLE: 228e573520bSDavid Brownell case REGULATOR_MODE_STANDBY: 229e573520bSDavid Brownell break; 230e573520bSDavid Brownell default: 23189f425edSMark Brown rdev_err(rdev, "invalid mode %x specified\n", *mode); 232e573520bSDavid Brownell return -EINVAL; 233e573520bSDavid Brownell } 234e573520bSDavid Brownell 235414c70cbSLiam Girdwood if (!rdev->constraints) { 2365da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 237414c70cbSLiam Girdwood return -ENODEV; 238414c70cbSLiam Girdwood } 239414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 2405da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 241414c70cbSLiam Girdwood return -EPERM; 242414c70cbSLiam Girdwood } 2432c608234SMark Brown 2442c608234SMark Brown /* The modes are bitmasks, the most power hungry modes having 2452c608234SMark Brown * the lowest values. If the requested mode isn't supported 2462c608234SMark Brown * try higher modes. */ 2472c608234SMark Brown while (*mode) { 2482c608234SMark Brown if (rdev->constraints->valid_modes_mask & *mode) 249414c70cbSLiam Girdwood return 0; 2502c608234SMark Brown *mode /= 2; 2512c608234SMark Brown } 2522c608234SMark Brown 2532c608234SMark Brown return -EINVAL; 254414c70cbSLiam Girdwood } 255414c70cbSLiam Girdwood 256414c70cbSLiam Girdwood /* dynamic regulator mode switching constraint check */ 257414c70cbSLiam Girdwood static int regulator_check_drms(struct regulator_dev *rdev) 258414c70cbSLiam Girdwood { 259414c70cbSLiam Girdwood if (!rdev->constraints) { 2605da84fd9SJoe Perches rdev_err(rdev, "no constraints\n"); 261414c70cbSLiam Girdwood return -ENODEV; 262414c70cbSLiam Girdwood } 263414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 2645da84fd9SJoe Perches rdev_err(rdev, "operation not allowed\n"); 265414c70cbSLiam Girdwood return -EPERM; 266414c70cbSLiam Girdwood } 267414c70cbSLiam Girdwood return 0; 268414c70cbSLiam Girdwood } 269414c70cbSLiam Girdwood 270414c70cbSLiam Girdwood static ssize_t device_requested_uA_show(struct device *dev, 271414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 272414c70cbSLiam Girdwood { 273414c70cbSLiam Girdwood struct regulator *regulator; 274414c70cbSLiam Girdwood 275414c70cbSLiam Girdwood regulator = get_device_regulator(dev); 276414c70cbSLiam Girdwood if (regulator == NULL) 277414c70cbSLiam Girdwood return 0; 278414c70cbSLiam Girdwood 279414c70cbSLiam Girdwood return sprintf(buf, "%d\n", regulator->uA_load); 280414c70cbSLiam Girdwood } 281414c70cbSLiam Girdwood 282414c70cbSLiam Girdwood static ssize_t regulator_uV_show(struct device *dev, 283414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 284414c70cbSLiam Girdwood { 285a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 286414c70cbSLiam Girdwood ssize_t ret; 287414c70cbSLiam Girdwood 288414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 289414c70cbSLiam Girdwood ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 290414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 291414c70cbSLiam Girdwood 292414c70cbSLiam Girdwood return ret; 293414c70cbSLiam Girdwood } 2947ad68e2fSDavid Brownell static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 295414c70cbSLiam Girdwood 296414c70cbSLiam Girdwood static ssize_t regulator_uA_show(struct device *dev, 297414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 298414c70cbSLiam Girdwood { 299a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 300414c70cbSLiam Girdwood 301414c70cbSLiam Girdwood return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 302414c70cbSLiam Girdwood } 3037ad68e2fSDavid Brownell static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 304414c70cbSLiam Girdwood 305bc558a60SMark Brown static ssize_t regulator_name_show(struct device *dev, 306bc558a60SMark Brown struct device_attribute *attr, char *buf) 307bc558a60SMark Brown { 308bc558a60SMark Brown struct regulator_dev *rdev = dev_get_drvdata(dev); 309bc558a60SMark Brown 3101083c393SMark Brown return sprintf(buf, "%s\n", rdev_get_name(rdev)); 311bc558a60SMark Brown } 312bc558a60SMark Brown 3134fca9545SDavid Brownell static ssize_t regulator_print_opmode(char *buf, int mode) 314414c70cbSLiam Girdwood { 315414c70cbSLiam Girdwood switch (mode) { 316414c70cbSLiam Girdwood case REGULATOR_MODE_FAST: 317414c70cbSLiam Girdwood return sprintf(buf, "fast\n"); 318414c70cbSLiam Girdwood case REGULATOR_MODE_NORMAL: 319414c70cbSLiam Girdwood return sprintf(buf, "normal\n"); 320414c70cbSLiam Girdwood case REGULATOR_MODE_IDLE: 321414c70cbSLiam Girdwood return sprintf(buf, "idle\n"); 322414c70cbSLiam Girdwood case REGULATOR_MODE_STANDBY: 323414c70cbSLiam Girdwood return sprintf(buf, "standby\n"); 324414c70cbSLiam Girdwood } 325414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 326414c70cbSLiam Girdwood } 327414c70cbSLiam Girdwood 3284fca9545SDavid Brownell static ssize_t regulator_opmode_show(struct device *dev, 329414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 330414c70cbSLiam Girdwood { 331a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 332414c70cbSLiam Girdwood 3334fca9545SDavid Brownell return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 3344fca9545SDavid Brownell } 3357ad68e2fSDavid Brownell static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 3364fca9545SDavid Brownell 3374fca9545SDavid Brownell static ssize_t regulator_print_state(char *buf, int state) 3384fca9545SDavid Brownell { 339414c70cbSLiam Girdwood if (state > 0) 340414c70cbSLiam Girdwood return sprintf(buf, "enabled\n"); 341414c70cbSLiam Girdwood else if (state == 0) 342414c70cbSLiam Girdwood return sprintf(buf, "disabled\n"); 343414c70cbSLiam Girdwood else 344414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 345414c70cbSLiam Girdwood } 346414c70cbSLiam Girdwood 3474fca9545SDavid Brownell static ssize_t regulator_state_show(struct device *dev, 3484fca9545SDavid Brownell struct device_attribute *attr, char *buf) 3494fca9545SDavid Brownell { 3504fca9545SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 3519332546fSMark Brown ssize_t ret; 3524fca9545SDavid Brownell 3539332546fSMark Brown mutex_lock(&rdev->mutex); 3549332546fSMark Brown ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 3559332546fSMark Brown mutex_unlock(&rdev->mutex); 3569332546fSMark Brown 3579332546fSMark Brown return ret; 3584fca9545SDavid Brownell } 3597ad68e2fSDavid Brownell static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 3604fca9545SDavid Brownell 361853116a1SDavid Brownell static ssize_t regulator_status_show(struct device *dev, 362853116a1SDavid Brownell struct device_attribute *attr, char *buf) 363853116a1SDavid Brownell { 364853116a1SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 365853116a1SDavid Brownell int status; 366853116a1SDavid Brownell char *label; 367853116a1SDavid Brownell 368853116a1SDavid Brownell status = rdev->desc->ops->get_status(rdev); 369853116a1SDavid Brownell if (status < 0) 370853116a1SDavid Brownell return status; 371853116a1SDavid Brownell 372853116a1SDavid Brownell switch (status) { 373853116a1SDavid Brownell case REGULATOR_STATUS_OFF: 374853116a1SDavid Brownell label = "off"; 375853116a1SDavid Brownell break; 376853116a1SDavid Brownell case REGULATOR_STATUS_ON: 377853116a1SDavid Brownell label = "on"; 378853116a1SDavid Brownell break; 379853116a1SDavid Brownell case REGULATOR_STATUS_ERROR: 380853116a1SDavid Brownell label = "error"; 381853116a1SDavid Brownell break; 382853116a1SDavid Brownell case REGULATOR_STATUS_FAST: 383853116a1SDavid Brownell label = "fast"; 384853116a1SDavid Brownell break; 385853116a1SDavid Brownell case REGULATOR_STATUS_NORMAL: 386853116a1SDavid Brownell label = "normal"; 387853116a1SDavid Brownell break; 388853116a1SDavid Brownell case REGULATOR_STATUS_IDLE: 389853116a1SDavid Brownell label = "idle"; 390853116a1SDavid Brownell break; 391853116a1SDavid Brownell case REGULATOR_STATUS_STANDBY: 392853116a1SDavid Brownell label = "standby"; 393853116a1SDavid Brownell break; 394853116a1SDavid Brownell default: 395853116a1SDavid Brownell return -ERANGE; 396853116a1SDavid Brownell } 397853116a1SDavid Brownell 398853116a1SDavid Brownell return sprintf(buf, "%s\n", label); 399853116a1SDavid Brownell } 400853116a1SDavid Brownell static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 401853116a1SDavid Brownell 402414c70cbSLiam Girdwood static ssize_t regulator_min_uA_show(struct device *dev, 403414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 404414c70cbSLiam Girdwood { 405a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 406414c70cbSLiam Girdwood 407414c70cbSLiam Girdwood if (!rdev->constraints) 408414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 409414c70cbSLiam Girdwood 410414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uA); 411414c70cbSLiam Girdwood } 4127ad68e2fSDavid Brownell static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 413414c70cbSLiam Girdwood 414414c70cbSLiam Girdwood static ssize_t regulator_max_uA_show(struct device *dev, 415414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 416414c70cbSLiam Girdwood { 417a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 418414c70cbSLiam Girdwood 419414c70cbSLiam Girdwood if (!rdev->constraints) 420414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 421414c70cbSLiam Girdwood 422414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uA); 423414c70cbSLiam Girdwood } 4247ad68e2fSDavid Brownell static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 425414c70cbSLiam Girdwood 426414c70cbSLiam Girdwood static ssize_t regulator_min_uV_show(struct device *dev, 427414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 428414c70cbSLiam Girdwood { 429a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 430414c70cbSLiam Girdwood 431414c70cbSLiam Girdwood if (!rdev->constraints) 432414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 433414c70cbSLiam Girdwood 434414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uV); 435414c70cbSLiam Girdwood } 4367ad68e2fSDavid Brownell static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 437414c70cbSLiam Girdwood 438414c70cbSLiam Girdwood static ssize_t regulator_max_uV_show(struct device *dev, 439414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 440414c70cbSLiam Girdwood { 441a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 442414c70cbSLiam Girdwood 443414c70cbSLiam Girdwood if (!rdev->constraints) 444414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 445414c70cbSLiam Girdwood 446414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uV); 447414c70cbSLiam Girdwood } 4487ad68e2fSDavid Brownell static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 449414c70cbSLiam Girdwood 450414c70cbSLiam Girdwood static ssize_t regulator_total_uA_show(struct device *dev, 451414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 452414c70cbSLiam Girdwood { 453a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 454414c70cbSLiam Girdwood struct regulator *regulator; 455414c70cbSLiam Girdwood int uA = 0; 456414c70cbSLiam Girdwood 457414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 458414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) 459414c70cbSLiam Girdwood uA += regulator->uA_load; 460414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 461414c70cbSLiam Girdwood return sprintf(buf, "%d\n", uA); 462414c70cbSLiam Girdwood } 4637ad68e2fSDavid Brownell static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 464414c70cbSLiam Girdwood 465414c70cbSLiam Girdwood static ssize_t regulator_num_users_show(struct device *dev, 466414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 467414c70cbSLiam Girdwood { 468a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 469414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->use_count); 470414c70cbSLiam Girdwood } 471414c70cbSLiam Girdwood 472414c70cbSLiam Girdwood static ssize_t regulator_type_show(struct device *dev, 473414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 474414c70cbSLiam Girdwood { 475a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 476414c70cbSLiam Girdwood 477414c70cbSLiam Girdwood switch (rdev->desc->type) { 478414c70cbSLiam Girdwood case REGULATOR_VOLTAGE: 479414c70cbSLiam Girdwood return sprintf(buf, "voltage\n"); 480414c70cbSLiam Girdwood case REGULATOR_CURRENT: 481414c70cbSLiam Girdwood return sprintf(buf, "current\n"); 482414c70cbSLiam Girdwood } 483414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 484414c70cbSLiam Girdwood } 485414c70cbSLiam Girdwood 486414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 487414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 488414c70cbSLiam Girdwood { 489a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 490414c70cbSLiam Girdwood 491414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 492414c70cbSLiam Girdwood } 4937ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_microvolts, 0444, 4947ad68e2fSDavid Brownell regulator_suspend_mem_uV_show, NULL); 495414c70cbSLiam Girdwood 496414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 497414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 498414c70cbSLiam Girdwood { 499a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 500414c70cbSLiam Girdwood 501414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 502414c70cbSLiam Girdwood } 5037ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_microvolts, 0444, 5047ad68e2fSDavid Brownell regulator_suspend_disk_uV_show, NULL); 505414c70cbSLiam Girdwood 506414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 507414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 508414c70cbSLiam Girdwood { 509a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 510414c70cbSLiam Girdwood 511414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 512414c70cbSLiam Girdwood } 5137ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_microvolts, 0444, 5147ad68e2fSDavid Brownell regulator_suspend_standby_uV_show, NULL); 515414c70cbSLiam Girdwood 516414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 517414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 518414c70cbSLiam Girdwood { 519a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 520414c70cbSLiam Girdwood 5214fca9545SDavid Brownell return regulator_print_opmode(buf, 5224fca9545SDavid Brownell rdev->constraints->state_mem.mode); 523414c70cbSLiam Girdwood } 5247ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_mode, 0444, 5257ad68e2fSDavid Brownell regulator_suspend_mem_mode_show, NULL); 526414c70cbSLiam Girdwood 527414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 528414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 529414c70cbSLiam Girdwood { 530a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 531414c70cbSLiam Girdwood 5324fca9545SDavid Brownell return regulator_print_opmode(buf, 5334fca9545SDavid Brownell rdev->constraints->state_disk.mode); 534414c70cbSLiam Girdwood } 5357ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_mode, 0444, 5367ad68e2fSDavid Brownell regulator_suspend_disk_mode_show, NULL); 537414c70cbSLiam Girdwood 538414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 539414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 540414c70cbSLiam Girdwood { 541a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 542414c70cbSLiam Girdwood 5434fca9545SDavid Brownell return regulator_print_opmode(buf, 5444fca9545SDavid Brownell rdev->constraints->state_standby.mode); 545414c70cbSLiam Girdwood } 5467ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_mode, 0444, 5477ad68e2fSDavid Brownell regulator_suspend_standby_mode_show, NULL); 548414c70cbSLiam Girdwood 549414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_state_show(struct device *dev, 550414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 551414c70cbSLiam Girdwood { 552a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 553414c70cbSLiam Girdwood 5544fca9545SDavid Brownell return regulator_print_state(buf, 5554fca9545SDavid Brownell rdev->constraints->state_mem.enabled); 556414c70cbSLiam Girdwood } 5577ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_state, 0444, 5587ad68e2fSDavid Brownell regulator_suspend_mem_state_show, NULL); 559414c70cbSLiam Girdwood 560414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_state_show(struct device *dev, 561414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 562414c70cbSLiam Girdwood { 563a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 564414c70cbSLiam Girdwood 5654fca9545SDavid Brownell return regulator_print_state(buf, 5664fca9545SDavid Brownell rdev->constraints->state_disk.enabled); 567414c70cbSLiam Girdwood } 5687ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_state, 0444, 5697ad68e2fSDavid Brownell regulator_suspend_disk_state_show, NULL); 570414c70cbSLiam Girdwood 571414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_state_show(struct device *dev, 572414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 573414c70cbSLiam Girdwood { 574a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 575414c70cbSLiam Girdwood 5764fca9545SDavid Brownell return regulator_print_state(buf, 5774fca9545SDavid Brownell rdev->constraints->state_standby.enabled); 578414c70cbSLiam Girdwood } 5797ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_state, 0444, 5807ad68e2fSDavid Brownell regulator_suspend_standby_state_show, NULL); 581bc558a60SMark Brown 5827ad68e2fSDavid Brownell 5837ad68e2fSDavid Brownell /* 5847ad68e2fSDavid Brownell * These are the only attributes are present for all regulators. 5857ad68e2fSDavid Brownell * Other attributes are a function of regulator functionality. 5867ad68e2fSDavid Brownell */ 587414c70cbSLiam Girdwood static struct device_attribute regulator_dev_attrs[] = { 588bc558a60SMark Brown __ATTR(name, 0444, regulator_name_show, NULL), 589414c70cbSLiam Girdwood __ATTR(num_users, 0444, regulator_num_users_show, NULL), 590414c70cbSLiam Girdwood __ATTR(type, 0444, regulator_type_show, NULL), 591414c70cbSLiam Girdwood __ATTR_NULL, 592414c70cbSLiam Girdwood }; 593414c70cbSLiam Girdwood 594414c70cbSLiam Girdwood static void regulator_dev_release(struct device *dev) 595414c70cbSLiam Girdwood { 596a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 597414c70cbSLiam Girdwood kfree(rdev); 598414c70cbSLiam Girdwood } 599414c70cbSLiam Girdwood 600414c70cbSLiam Girdwood static struct class regulator_class = { 601414c70cbSLiam Girdwood .name = "regulator", 602414c70cbSLiam Girdwood .dev_release = regulator_dev_release, 603414c70cbSLiam Girdwood .dev_attrs = regulator_dev_attrs, 604414c70cbSLiam Girdwood }; 605414c70cbSLiam Girdwood 606414c70cbSLiam Girdwood /* Calculate the new optimum regulator operating mode based on the new total 607414c70cbSLiam Girdwood * consumer load. All locks held by caller */ 608414c70cbSLiam Girdwood static void drms_uA_update(struct regulator_dev *rdev) 609414c70cbSLiam Girdwood { 610414c70cbSLiam Girdwood struct regulator *sibling; 611414c70cbSLiam Girdwood int current_uA = 0, output_uV, input_uV, err; 612414c70cbSLiam Girdwood unsigned int mode; 613414c70cbSLiam Girdwood 614414c70cbSLiam Girdwood err = regulator_check_drms(rdev); 615414c70cbSLiam Girdwood if (err < 0 || !rdev->desc->ops->get_optimum_mode || 616476c2d83SMark Brown (!rdev->desc->ops->get_voltage && 617476c2d83SMark Brown !rdev->desc->ops->get_voltage_sel) || 618476c2d83SMark Brown !rdev->desc->ops->set_mode) 619414c70cbSLiam Girdwood return; 620414c70cbSLiam Girdwood 621414c70cbSLiam Girdwood /* get output voltage */ 6221bf5a1f8SMark Brown output_uV = _regulator_get_voltage(rdev); 623414c70cbSLiam Girdwood if (output_uV <= 0) 624414c70cbSLiam Girdwood return; 625414c70cbSLiam Girdwood 626414c70cbSLiam Girdwood /* get input voltage */ 6271bf5a1f8SMark Brown input_uV = 0; 6281bf5a1f8SMark Brown if (rdev->supply) 6291bf5a1f8SMark Brown input_uV = _regulator_get_voltage(rdev); 6301bf5a1f8SMark Brown if (input_uV <= 0) 631414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 632414c70cbSLiam Girdwood if (input_uV <= 0) 633414c70cbSLiam Girdwood return; 634414c70cbSLiam Girdwood 635414c70cbSLiam Girdwood /* calc total requested load */ 636414c70cbSLiam Girdwood list_for_each_entry(sibling, &rdev->consumer_list, list) 637414c70cbSLiam Girdwood current_uA += sibling->uA_load; 638414c70cbSLiam Girdwood 639414c70cbSLiam Girdwood /* now get the optimum mode for our new total regulator load */ 640414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 641414c70cbSLiam Girdwood output_uV, current_uA); 642414c70cbSLiam Girdwood 643414c70cbSLiam Girdwood /* check the new mode is allowed */ 6442c608234SMark Brown err = regulator_mode_constrain(rdev, &mode); 645414c70cbSLiam Girdwood if (err == 0) 646414c70cbSLiam Girdwood rdev->desc->ops->set_mode(rdev, mode); 647414c70cbSLiam Girdwood } 648414c70cbSLiam Girdwood 649414c70cbSLiam Girdwood static int suspend_set_state(struct regulator_dev *rdev, 650414c70cbSLiam Girdwood struct regulator_state *rstate) 651414c70cbSLiam Girdwood { 652414c70cbSLiam Girdwood int ret = 0; 653638f85c5SMark Brown bool can_set_state; 654414c70cbSLiam Girdwood 655638f85c5SMark Brown can_set_state = rdev->desc->ops->set_suspend_enable && 656638f85c5SMark Brown rdev->desc->ops->set_suspend_disable; 657638f85c5SMark Brown 658638f85c5SMark Brown /* If we have no suspend mode configration don't set anything; 659638f85c5SMark Brown * only warn if the driver actually makes the suspend mode 660638f85c5SMark Brown * configurable. 661638f85c5SMark Brown */ 662638f85c5SMark Brown if (!rstate->enabled && !rstate->disabled) { 663638f85c5SMark Brown if (can_set_state) 6645da84fd9SJoe Perches rdev_warn(rdev, "No configuration\n"); 665638f85c5SMark Brown return 0; 666638f85c5SMark Brown } 667638f85c5SMark Brown 668638f85c5SMark Brown if (rstate->enabled && rstate->disabled) { 6695da84fd9SJoe Perches rdev_err(rdev, "invalid configuration\n"); 670638f85c5SMark Brown return -EINVAL; 671638f85c5SMark Brown } 672638f85c5SMark Brown 673638f85c5SMark Brown if (!can_set_state) { 6745da84fd9SJoe Perches rdev_err(rdev, "no way to set suspend state\n"); 675414c70cbSLiam Girdwood return -EINVAL; 676a5766f11SLiam Girdwood } 677414c70cbSLiam Girdwood 678414c70cbSLiam Girdwood if (rstate->enabled) 679414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_enable(rdev); 680414c70cbSLiam Girdwood else 681414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_disable(rdev); 682414c70cbSLiam Girdwood if (ret < 0) { 6835da84fd9SJoe Perches rdev_err(rdev, "failed to enabled/disable\n"); 684414c70cbSLiam Girdwood return ret; 685414c70cbSLiam Girdwood } 686414c70cbSLiam Girdwood 687414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 688414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 689414c70cbSLiam Girdwood if (ret < 0) { 6905da84fd9SJoe Perches rdev_err(rdev, "failed to set voltage\n"); 691414c70cbSLiam Girdwood return ret; 692414c70cbSLiam Girdwood } 693414c70cbSLiam Girdwood } 694414c70cbSLiam Girdwood 695414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 696414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 697414c70cbSLiam Girdwood if (ret < 0) { 6985da84fd9SJoe Perches rdev_err(rdev, "failed to set mode\n"); 699414c70cbSLiam Girdwood return ret; 700414c70cbSLiam Girdwood } 701414c70cbSLiam Girdwood } 702414c70cbSLiam Girdwood return ret; 703414c70cbSLiam Girdwood } 704414c70cbSLiam Girdwood 705414c70cbSLiam Girdwood /* locks held by caller */ 706414c70cbSLiam Girdwood static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 707414c70cbSLiam Girdwood { 708414c70cbSLiam Girdwood if (!rdev->constraints) 709414c70cbSLiam Girdwood return -EINVAL; 710414c70cbSLiam Girdwood 711414c70cbSLiam Girdwood switch (state) { 712414c70cbSLiam Girdwood case PM_SUSPEND_STANDBY: 713414c70cbSLiam Girdwood return suspend_set_state(rdev, 714414c70cbSLiam Girdwood &rdev->constraints->state_standby); 715414c70cbSLiam Girdwood case PM_SUSPEND_MEM: 716414c70cbSLiam Girdwood return suspend_set_state(rdev, 717414c70cbSLiam Girdwood &rdev->constraints->state_mem); 718414c70cbSLiam Girdwood case PM_SUSPEND_MAX: 719414c70cbSLiam Girdwood return suspend_set_state(rdev, 720414c70cbSLiam Girdwood &rdev->constraints->state_disk); 721414c70cbSLiam Girdwood default: 722414c70cbSLiam Girdwood return -EINVAL; 723414c70cbSLiam Girdwood } 724414c70cbSLiam Girdwood } 725414c70cbSLiam Girdwood 726414c70cbSLiam Girdwood static void print_constraints(struct regulator_dev *rdev) 727414c70cbSLiam Girdwood { 728414c70cbSLiam Girdwood struct regulation_constraints *constraints = rdev->constraints; 729973e9a27SMark Brown char buf[80] = ""; 7308f031b48SMark Brown int count = 0; 7318f031b48SMark Brown int ret; 732414c70cbSLiam Girdwood 7338f031b48SMark Brown if (constraints->min_uV && constraints->max_uV) { 734414c70cbSLiam Girdwood if (constraints->min_uV == constraints->max_uV) 7358f031b48SMark Brown count += sprintf(buf + count, "%d mV ", 736414c70cbSLiam Girdwood constraints->min_uV / 1000); 737414c70cbSLiam Girdwood else 7388f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mV ", 739414c70cbSLiam Girdwood constraints->min_uV / 1000, 740414c70cbSLiam Girdwood constraints->max_uV / 1000); 7418f031b48SMark Brown } 7428f031b48SMark Brown 7438f031b48SMark Brown if (!constraints->min_uV || 7448f031b48SMark Brown constraints->min_uV != constraints->max_uV) { 7458f031b48SMark Brown ret = _regulator_get_voltage(rdev); 7468f031b48SMark Brown if (ret > 0) 7478f031b48SMark Brown count += sprintf(buf + count, "at %d mV ", ret / 1000); 7488f031b48SMark Brown } 7498f031b48SMark Brown 750bf5892a8SMark Brown if (constraints->uV_offset) 751bf5892a8SMark Brown count += sprintf(buf, "%dmV offset ", 752bf5892a8SMark Brown constraints->uV_offset / 1000); 753bf5892a8SMark Brown 7548f031b48SMark Brown if (constraints->min_uA && constraints->max_uA) { 755414c70cbSLiam Girdwood if (constraints->min_uA == constraints->max_uA) 7568f031b48SMark Brown count += sprintf(buf + count, "%d mA ", 757414c70cbSLiam Girdwood constraints->min_uA / 1000); 758414c70cbSLiam Girdwood else 7598f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mA ", 760414c70cbSLiam Girdwood constraints->min_uA / 1000, 761414c70cbSLiam Girdwood constraints->max_uA / 1000); 762414c70cbSLiam Girdwood } 7638f031b48SMark Brown 7648f031b48SMark Brown if (!constraints->min_uA || 7658f031b48SMark Brown constraints->min_uA != constraints->max_uA) { 7668f031b48SMark Brown ret = _regulator_get_current_limit(rdev); 7678f031b48SMark Brown if (ret > 0) 768e4a6376bSCyril Chemparathy count += sprintf(buf + count, "at %d mA ", ret / 1000); 7698f031b48SMark Brown } 7708f031b48SMark Brown 771414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 772414c70cbSLiam Girdwood count += sprintf(buf + count, "fast "); 773414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 774414c70cbSLiam Girdwood count += sprintf(buf + count, "normal "); 775414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 776414c70cbSLiam Girdwood count += sprintf(buf + count, "idle "); 777414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 778414c70cbSLiam Girdwood count += sprintf(buf + count, "standby"); 779414c70cbSLiam Girdwood 78013ce29f8SMark Brown rdev_info(rdev, "%s\n", buf); 781414c70cbSLiam Girdwood } 782414c70cbSLiam Girdwood 783e79055d6SMark Brown static int machine_constraints_voltage(struct regulator_dev *rdev, 7841083c393SMark Brown struct regulation_constraints *constraints) 785e79055d6SMark Brown { 786e79055d6SMark Brown struct regulator_ops *ops = rdev->desc->ops; 787af5866c9SMark Brown int ret; 788af5866c9SMark Brown 789af5866c9SMark Brown /* do we need to apply the constraint voltage */ 790af5866c9SMark Brown if (rdev->constraints->apply_uV && 79175790251SMark Brown rdev->constraints->min_uV == rdev->constraints->max_uV) { 79275790251SMark Brown ret = _regulator_do_set_voltage(rdev, 7933a93f2a9SMark Brown rdev->constraints->min_uV, 79475790251SMark Brown rdev->constraints->max_uV); 795af5866c9SMark Brown if (ret < 0) { 7965da84fd9SJoe Perches rdev_err(rdev, "failed to apply %duV constraint\n", 7975da84fd9SJoe Perches rdev->constraints->min_uV); 798af5866c9SMark Brown return ret; 799af5866c9SMark Brown } 800af5866c9SMark Brown } 801e79055d6SMark Brown 802e79055d6SMark Brown /* constrain machine-level voltage specs to fit 803e79055d6SMark Brown * the actual range supported by this regulator. 804e79055d6SMark Brown */ 805e79055d6SMark Brown if (ops->list_voltage && rdev->desc->n_voltages) { 806e79055d6SMark Brown int count = rdev->desc->n_voltages; 807e79055d6SMark Brown int i; 808e79055d6SMark Brown int min_uV = INT_MAX; 809e79055d6SMark Brown int max_uV = INT_MIN; 810e79055d6SMark Brown int cmin = constraints->min_uV; 811e79055d6SMark Brown int cmax = constraints->max_uV; 812e79055d6SMark Brown 813e79055d6SMark Brown /* it's safe to autoconfigure fixed-voltage supplies 814e79055d6SMark Brown and the constraints are used by list_voltage. */ 815e79055d6SMark Brown if (count == 1 && !cmin) { 816e79055d6SMark Brown cmin = 1; 817e79055d6SMark Brown cmax = INT_MAX; 818e79055d6SMark Brown constraints->min_uV = cmin; 819e79055d6SMark Brown constraints->max_uV = cmax; 820e79055d6SMark Brown } 821e79055d6SMark Brown 822e79055d6SMark Brown /* voltage constraints are optional */ 823e79055d6SMark Brown if ((cmin == 0) && (cmax == 0)) 824e79055d6SMark Brown return 0; 825e79055d6SMark Brown 826e79055d6SMark Brown /* else require explicit machine-level constraints */ 827e79055d6SMark Brown if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 8285da84fd9SJoe Perches rdev_err(rdev, "invalid voltage constraints\n"); 829e79055d6SMark Brown return -EINVAL; 830e79055d6SMark Brown } 831e79055d6SMark Brown 832e79055d6SMark Brown /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 833e79055d6SMark Brown for (i = 0; i < count; i++) { 834e79055d6SMark Brown int value; 835e79055d6SMark Brown 836e79055d6SMark Brown value = ops->list_voltage(rdev, i); 837e79055d6SMark Brown if (value <= 0) 838e79055d6SMark Brown continue; 839e79055d6SMark Brown 840e79055d6SMark Brown /* maybe adjust [min_uV..max_uV] */ 841e79055d6SMark Brown if (value >= cmin && value < min_uV) 842e79055d6SMark Brown min_uV = value; 843e79055d6SMark Brown if (value <= cmax && value > max_uV) 844e79055d6SMark Brown max_uV = value; 845e79055d6SMark Brown } 846e79055d6SMark Brown 847e79055d6SMark Brown /* final: [min_uV..max_uV] valid iff constraints valid */ 848e79055d6SMark Brown if (max_uV < min_uV) { 8495da84fd9SJoe Perches rdev_err(rdev, "unsupportable voltage constraints\n"); 850e79055d6SMark Brown return -EINVAL; 851e79055d6SMark Brown } 852e79055d6SMark Brown 853e79055d6SMark Brown /* use regulator's subset of machine constraints */ 854e79055d6SMark Brown if (constraints->min_uV < min_uV) { 8555da84fd9SJoe Perches rdev_dbg(rdev, "override min_uV, %d -> %d\n", 8565da84fd9SJoe Perches constraints->min_uV, min_uV); 857e79055d6SMark Brown constraints->min_uV = min_uV; 858e79055d6SMark Brown } 859e79055d6SMark Brown if (constraints->max_uV > max_uV) { 8605da84fd9SJoe Perches rdev_dbg(rdev, "override max_uV, %d -> %d\n", 8615da84fd9SJoe Perches constraints->max_uV, max_uV); 862e79055d6SMark Brown constraints->max_uV = max_uV; 863e79055d6SMark Brown } 864e79055d6SMark Brown } 865e79055d6SMark Brown 866e79055d6SMark Brown return 0; 867e79055d6SMark Brown } 868e79055d6SMark Brown 869a5766f11SLiam Girdwood /** 870a5766f11SLiam Girdwood * set_machine_constraints - sets regulator constraints 87169279fb9SMark Brown * @rdev: regulator source 872c8e7e464SMark Brown * @constraints: constraints to apply 873a5766f11SLiam Girdwood * 874a5766f11SLiam Girdwood * Allows platform initialisation code to define and constrain 875a5766f11SLiam Girdwood * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 876a5766f11SLiam Girdwood * Constraints *must* be set by platform code in order for some 877a5766f11SLiam Girdwood * regulator operations to proceed i.e. set_voltage, set_current_limit, 878a5766f11SLiam Girdwood * set_mode. 879a5766f11SLiam Girdwood */ 880a5766f11SLiam Girdwood static int set_machine_constraints(struct regulator_dev *rdev, 881f8c12fe3SMark Brown const struct regulation_constraints *constraints) 882a5766f11SLiam Girdwood { 883a5766f11SLiam Girdwood int ret = 0; 884e5fda26cSMark Brown struct regulator_ops *ops = rdev->desc->ops; 885e06f5b4fSMark Brown 886f8c12fe3SMark Brown rdev->constraints = kmemdup(constraints, sizeof(*constraints), 887f8c12fe3SMark Brown GFP_KERNEL); 888f8c12fe3SMark Brown if (!rdev->constraints) 889f8c12fe3SMark Brown return -ENOMEM; 890af5866c9SMark Brown 891f8c12fe3SMark Brown ret = machine_constraints_voltage(rdev, rdev->constraints); 892e79055d6SMark Brown if (ret != 0) 8933e2b9abdSMark Brown goto out; 8943e2b9abdSMark Brown 895a5766f11SLiam Girdwood /* do we need to setup our suspend state */ 896e06f5b4fSMark Brown if (constraints->initial_state) { 897f8c12fe3SMark Brown ret = suspend_prepare(rdev, rdev->constraints->initial_state); 898e06f5b4fSMark Brown if (ret < 0) { 8995da84fd9SJoe Perches rdev_err(rdev, "failed to set suspend state\n"); 900e06f5b4fSMark Brown goto out; 901e06f5b4fSMark Brown } 902e06f5b4fSMark Brown } 903a5766f11SLiam Girdwood 904a308466cSMark Brown if (constraints->initial_mode) { 905a308466cSMark Brown if (!ops->set_mode) { 9065da84fd9SJoe Perches rdev_err(rdev, "no set_mode operation\n"); 907a308466cSMark Brown ret = -EINVAL; 908a308466cSMark Brown goto out; 909a308466cSMark Brown } 910a308466cSMark Brown 911f8c12fe3SMark Brown ret = ops->set_mode(rdev, rdev->constraints->initial_mode); 912a308466cSMark Brown if (ret < 0) { 9135da84fd9SJoe Perches rdev_err(rdev, "failed to set initial mode: %d\n", ret); 914a308466cSMark Brown goto out; 915a308466cSMark Brown } 916a308466cSMark Brown } 917a308466cSMark Brown 918cacf90f2SMark Brown /* If the constraints say the regulator should be on at this point 919cacf90f2SMark Brown * and we have control then make sure it is enabled. 920cacf90f2SMark Brown */ 921f8c12fe3SMark Brown if ((rdev->constraints->always_on || rdev->constraints->boot_on) && 922f8c12fe3SMark Brown ops->enable) { 923e5fda26cSMark Brown ret = ops->enable(rdev); 924e5fda26cSMark Brown if (ret < 0) { 9255da84fd9SJoe Perches rdev_err(rdev, "failed to enable\n"); 926e5fda26cSMark Brown goto out; 927e5fda26cSMark Brown } 928e5fda26cSMark Brown } 929e5fda26cSMark Brown 930a5766f11SLiam Girdwood print_constraints(rdev); 9311a6958e7SAxel Lin return 0; 932a5766f11SLiam Girdwood out: 9331a6958e7SAxel Lin kfree(rdev->constraints); 9341a6958e7SAxel Lin rdev->constraints = NULL; 935a5766f11SLiam Girdwood return ret; 936a5766f11SLiam Girdwood } 937a5766f11SLiam Girdwood 938a5766f11SLiam Girdwood /** 939a5766f11SLiam Girdwood * set_supply - set regulator supply regulator 94069279fb9SMark Brown * @rdev: regulator name 94169279fb9SMark Brown * @supply_rdev: supply regulator name 942a5766f11SLiam Girdwood * 943a5766f11SLiam Girdwood * Called by platform initialisation code to set the supply regulator for this 944a5766f11SLiam Girdwood * regulator. This ensures that a regulators supply will also be enabled by the 945a5766f11SLiam Girdwood * core if it's child is enabled. 946a5766f11SLiam Girdwood */ 947a5766f11SLiam Girdwood static int set_supply(struct regulator_dev *rdev, 948a5766f11SLiam Girdwood struct regulator_dev *supply_rdev) 949a5766f11SLiam Girdwood { 950a5766f11SLiam Girdwood int err; 951a5766f11SLiam Girdwood 9523801b86aSMark Brown rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); 9533801b86aSMark Brown 9543801b86aSMark Brown rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); 9553801b86aSMark Brown if (IS_ERR(rdev->supply)) { 9563801b86aSMark Brown err = PTR_ERR(rdev->supply); 9573801b86aSMark Brown rdev->supply = NULL; 958a5766f11SLiam Girdwood return err; 959a5766f11SLiam Girdwood } 960a5766f11SLiam Girdwood 9613801b86aSMark Brown return 0; 9623801b86aSMark Brown } 9633801b86aSMark Brown 964a5766f11SLiam Girdwood /** 96506c63f93SRandy Dunlap * set_consumer_device_supply - Bind a regulator to a symbolic supply 96669279fb9SMark Brown * @rdev: regulator source 96769279fb9SMark Brown * @consumer_dev: device the supply applies to 96840f9244fSMark Brown * @consumer_dev_name: dev_name() string for device supply applies to 969a5766f11SLiam Girdwood * @supply: symbolic name for supply 970a5766f11SLiam Girdwood * 971a5766f11SLiam Girdwood * Allows platform initialisation code to map physical regulator 972a5766f11SLiam Girdwood * sources to symbolic names for supplies for use by devices. Devices 973a5766f11SLiam Girdwood * should use these symbolic names to request regulators, avoiding the 974a5766f11SLiam Girdwood * need to provide board-specific regulator names as platform data. 97540f9244fSMark Brown * 97640f9244fSMark Brown * Only one of consumer_dev and consumer_dev_name may be specified. 977a5766f11SLiam Girdwood */ 978a5766f11SLiam Girdwood static int set_consumer_device_supply(struct regulator_dev *rdev, 97940f9244fSMark Brown struct device *consumer_dev, const char *consumer_dev_name, 98040f9244fSMark Brown const char *supply) 981a5766f11SLiam Girdwood { 982a5766f11SLiam Girdwood struct regulator_map *node; 9839ed2099eSMark Brown int has_dev; 984a5766f11SLiam Girdwood 98540f9244fSMark Brown if (consumer_dev && consumer_dev_name) 98640f9244fSMark Brown return -EINVAL; 98740f9244fSMark Brown 98840f9244fSMark Brown if (!consumer_dev_name && consumer_dev) 98940f9244fSMark Brown consumer_dev_name = dev_name(consumer_dev); 99040f9244fSMark Brown 991a5766f11SLiam Girdwood if (supply == NULL) 992a5766f11SLiam Girdwood return -EINVAL; 993a5766f11SLiam Girdwood 9949ed2099eSMark Brown if (consumer_dev_name != NULL) 9959ed2099eSMark Brown has_dev = 1; 9969ed2099eSMark Brown else 9979ed2099eSMark Brown has_dev = 0; 9989ed2099eSMark Brown 9996001e13cSDavid Brownell list_for_each_entry(node, ®ulator_map_list, list) { 100023b5cc2aSJani Nikula if (node->dev_name && consumer_dev_name) { 100123b5cc2aSJani Nikula if (strcmp(node->dev_name, consumer_dev_name) != 0) 10026001e13cSDavid Brownell continue; 100323b5cc2aSJani Nikula } else if (node->dev_name || consumer_dev_name) { 100423b5cc2aSJani Nikula continue; 100523b5cc2aSJani Nikula } 100623b5cc2aSJani Nikula 10076001e13cSDavid Brownell if (strcmp(node->supply, supply) != 0) 10086001e13cSDavid Brownell continue; 10096001e13cSDavid Brownell 10106001e13cSDavid Brownell dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 10116001e13cSDavid Brownell dev_name(&node->regulator->dev), 10126001e13cSDavid Brownell node->regulator->desc->name, 10136001e13cSDavid Brownell supply, 10141083c393SMark Brown dev_name(&rdev->dev), rdev_get_name(rdev)); 10156001e13cSDavid Brownell return -EBUSY; 10166001e13cSDavid Brownell } 10176001e13cSDavid Brownell 10189ed2099eSMark Brown node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 1019a5766f11SLiam Girdwood if (node == NULL) 1020a5766f11SLiam Girdwood return -ENOMEM; 1021a5766f11SLiam Girdwood 1022a5766f11SLiam Girdwood node->regulator = rdev; 1023a5766f11SLiam Girdwood node->supply = supply; 1024a5766f11SLiam Girdwood 10259ed2099eSMark Brown if (has_dev) { 10269ed2099eSMark Brown node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 102740f9244fSMark Brown if (node->dev_name == NULL) { 102840f9244fSMark Brown kfree(node); 102940f9244fSMark Brown return -ENOMEM; 103040f9244fSMark Brown } 10319ed2099eSMark Brown } 103240f9244fSMark Brown 1033a5766f11SLiam Girdwood list_add(&node->list, ®ulator_map_list); 1034a5766f11SLiam Girdwood return 0; 1035a5766f11SLiam Girdwood } 1036a5766f11SLiam Girdwood 10370f1d747bSMike Rapoport static void unset_regulator_supplies(struct regulator_dev *rdev) 10380f1d747bSMike Rapoport { 10390f1d747bSMike Rapoport struct regulator_map *node, *n; 10400f1d747bSMike Rapoport 10410f1d747bSMike Rapoport list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 10420f1d747bSMike Rapoport if (rdev == node->regulator) { 10430f1d747bSMike Rapoport list_del(&node->list); 104440f9244fSMark Brown kfree(node->dev_name); 10450f1d747bSMike Rapoport kfree(node); 10460f1d747bSMike Rapoport } 10470f1d747bSMike Rapoport } 10480f1d747bSMike Rapoport } 10490f1d747bSMike Rapoport 1050f5726ae3SMark Brown #define REG_STR_SIZE 64 1051414c70cbSLiam Girdwood 1052414c70cbSLiam Girdwood static struct regulator *create_regulator(struct regulator_dev *rdev, 1053414c70cbSLiam Girdwood struct device *dev, 1054414c70cbSLiam Girdwood const char *supply_name) 1055414c70cbSLiam Girdwood { 1056414c70cbSLiam Girdwood struct regulator *regulator; 1057414c70cbSLiam Girdwood char buf[REG_STR_SIZE]; 1058414c70cbSLiam Girdwood int err, size; 1059414c70cbSLiam Girdwood 1060414c70cbSLiam Girdwood regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1061414c70cbSLiam Girdwood if (regulator == NULL) 1062414c70cbSLiam Girdwood return NULL; 1063414c70cbSLiam Girdwood 1064414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1065414c70cbSLiam Girdwood regulator->rdev = rdev; 1066414c70cbSLiam Girdwood list_add(®ulator->list, &rdev->consumer_list); 1067414c70cbSLiam Girdwood 1068414c70cbSLiam Girdwood if (dev) { 1069414c70cbSLiam Girdwood /* create a 'requested_microamps_name' sysfs entry */ 1070e0eaedefSMark Brown size = scnprintf(buf, REG_STR_SIZE, 1071e0eaedefSMark Brown "microamps_requested_%s-%s", 1072e0eaedefSMark Brown dev_name(dev), supply_name); 1073414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1074414c70cbSLiam Girdwood goto overflow_err; 1075414c70cbSLiam Girdwood 1076414c70cbSLiam Girdwood regulator->dev = dev; 10774f26a2abSAmeya Palande sysfs_attr_init(®ulator->dev_attr.attr); 1078414c70cbSLiam Girdwood regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1079414c70cbSLiam Girdwood if (regulator->dev_attr.attr.name == NULL) 1080414c70cbSLiam Girdwood goto attr_name_err; 1081414c70cbSLiam Girdwood 1082414c70cbSLiam Girdwood regulator->dev_attr.attr.mode = 0444; 1083414c70cbSLiam Girdwood regulator->dev_attr.show = device_requested_uA_show; 1084414c70cbSLiam Girdwood err = device_create_file(dev, ®ulator->dev_attr); 1085414c70cbSLiam Girdwood if (err < 0) { 10865da84fd9SJoe Perches rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n"); 1087414c70cbSLiam Girdwood goto attr_name_err; 1088414c70cbSLiam Girdwood } 1089414c70cbSLiam Girdwood 1090414c70cbSLiam Girdwood /* also add a link to the device sysfs entry */ 1091414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1092414c70cbSLiam Girdwood dev->kobj.name, supply_name); 1093414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1094414c70cbSLiam Girdwood goto attr_err; 1095414c70cbSLiam Girdwood 1096414c70cbSLiam Girdwood regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1097414c70cbSLiam Girdwood if (regulator->supply_name == NULL) 1098414c70cbSLiam Girdwood goto attr_err; 1099414c70cbSLiam Girdwood 1100414c70cbSLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1101414c70cbSLiam Girdwood buf); 1102414c70cbSLiam Girdwood if (err) { 11035da84fd9SJoe Perches rdev_warn(rdev, "could not add device link %s err %d\n", 11041d7372e1SDaniel Walker dev->kobj.name, err); 1105414c70cbSLiam Girdwood goto link_name_err; 1106414c70cbSLiam Girdwood } 11075de70519SMark Brown } else { 11085de70519SMark Brown regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); 11095de70519SMark Brown if (regulator->supply_name == NULL) 11105de70519SMark Brown goto attr_err; 1111414c70cbSLiam Girdwood } 11125de70519SMark Brown 11135de70519SMark Brown #ifdef CONFIG_DEBUG_FS 11145de70519SMark Brown regulator->debugfs = debugfs_create_dir(regulator->supply_name, 11155de70519SMark Brown rdev->debugfs); 11165de70519SMark Brown if (IS_ERR_OR_NULL(regulator->debugfs)) { 11175de70519SMark Brown rdev_warn(rdev, "Failed to create debugfs directory\n"); 11185de70519SMark Brown regulator->debugfs = NULL; 11195de70519SMark Brown } else { 11205de70519SMark Brown debugfs_create_u32("uA_load", 0444, regulator->debugfs, 11215de70519SMark Brown ®ulator->uA_load); 11225de70519SMark Brown debugfs_create_u32("min_uV", 0444, regulator->debugfs, 11235de70519SMark Brown ®ulator->min_uV); 11245de70519SMark Brown debugfs_create_u32("max_uV", 0444, regulator->debugfs, 11255de70519SMark Brown ®ulator->max_uV); 11265de70519SMark Brown } 11275de70519SMark Brown #endif 11285de70519SMark Brown 1129414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1130414c70cbSLiam Girdwood return regulator; 1131414c70cbSLiam Girdwood link_name_err: 1132414c70cbSLiam Girdwood kfree(regulator->supply_name); 1133414c70cbSLiam Girdwood attr_err: 1134414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1135414c70cbSLiam Girdwood attr_name_err: 1136414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1137414c70cbSLiam Girdwood overflow_err: 1138414c70cbSLiam Girdwood list_del(®ulator->list); 1139414c70cbSLiam Girdwood kfree(regulator); 1140414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1141414c70cbSLiam Girdwood return NULL; 1142414c70cbSLiam Girdwood } 1143414c70cbSLiam Girdwood 114431aae2beSMark Brown static int _regulator_get_enable_time(struct regulator_dev *rdev) 114531aae2beSMark Brown { 114631aae2beSMark Brown if (!rdev->desc->ops->enable_time) 114731aae2beSMark Brown return 0; 114831aae2beSMark Brown return rdev->desc->ops->enable_time(rdev); 114931aae2beSMark Brown } 115031aae2beSMark Brown 11515ffbd136SMark Brown /* Internal regulator request function */ 11525ffbd136SMark Brown static struct regulator *_regulator_get(struct device *dev, const char *id, 11535ffbd136SMark Brown int exclusive) 1154414c70cbSLiam Girdwood { 1155414c70cbSLiam Girdwood struct regulator_dev *rdev; 1156414c70cbSLiam Girdwood struct regulator_map *map; 1157414c70cbSLiam Girdwood struct regulator *regulator = ERR_PTR(-ENODEV); 115840f9244fSMark Brown const char *devname = NULL; 11595ffbd136SMark Brown int ret; 1160414c70cbSLiam Girdwood 1161414c70cbSLiam Girdwood if (id == NULL) { 11625da84fd9SJoe Perches pr_err("get() with no identifier\n"); 1163414c70cbSLiam Girdwood return regulator; 1164414c70cbSLiam Girdwood } 1165414c70cbSLiam Girdwood 116640f9244fSMark Brown if (dev) 116740f9244fSMark Brown devname = dev_name(dev); 116840f9244fSMark Brown 1169414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1170414c70cbSLiam Girdwood 1171414c70cbSLiam Girdwood list_for_each_entry(map, ®ulator_map_list, list) { 117240f9244fSMark Brown /* If the mapping has a device set up it must match */ 117340f9244fSMark Brown if (map->dev_name && 117440f9244fSMark Brown (!devname || strcmp(map->dev_name, devname))) 117540f9244fSMark Brown continue; 117640f9244fSMark Brown 117740f9244fSMark Brown if (strcmp(map->supply, id) == 0) { 1178a5766f11SLiam Girdwood rdev = map->regulator; 1179414c70cbSLiam Girdwood goto found; 1180414c70cbSLiam Girdwood } 1181a5766f11SLiam Girdwood } 118234abbd68SMark Brown 1183688fe99aSMark Brown if (board_wants_dummy_regulator) { 1184688fe99aSMark Brown rdev = dummy_regulator_rdev; 1185688fe99aSMark Brown goto found; 1186688fe99aSMark Brown } 1187688fe99aSMark Brown 118834abbd68SMark Brown #ifdef CONFIG_REGULATOR_DUMMY 118934abbd68SMark Brown if (!devname) 119034abbd68SMark Brown devname = "deviceless"; 119134abbd68SMark Brown 119234abbd68SMark Brown /* If the board didn't flag that it was fully constrained then 119334abbd68SMark Brown * substitute in a dummy regulator so consumers can continue. 119434abbd68SMark Brown */ 119534abbd68SMark Brown if (!has_full_constraints) { 11965da84fd9SJoe Perches pr_warn("%s supply %s not found, using dummy regulator\n", 119734abbd68SMark Brown devname, id); 119834abbd68SMark Brown rdev = dummy_regulator_rdev; 119934abbd68SMark Brown goto found; 120034abbd68SMark Brown } 120134abbd68SMark Brown #endif 120234abbd68SMark Brown 1203414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1204414c70cbSLiam Girdwood return regulator; 1205414c70cbSLiam Girdwood 1206414c70cbSLiam Girdwood found: 12075ffbd136SMark Brown if (rdev->exclusive) { 12085ffbd136SMark Brown regulator = ERR_PTR(-EPERM); 12095ffbd136SMark Brown goto out; 12105ffbd136SMark Brown } 12115ffbd136SMark Brown 12125ffbd136SMark Brown if (exclusive && rdev->open_count) { 12135ffbd136SMark Brown regulator = ERR_PTR(-EBUSY); 12145ffbd136SMark Brown goto out; 12155ffbd136SMark Brown } 12165ffbd136SMark Brown 1217a5766f11SLiam Girdwood if (!try_module_get(rdev->owner)) 1218a5766f11SLiam Girdwood goto out; 1219a5766f11SLiam Girdwood 1220414c70cbSLiam Girdwood regulator = create_regulator(rdev, dev, id); 1221414c70cbSLiam Girdwood if (regulator == NULL) { 1222414c70cbSLiam Girdwood regulator = ERR_PTR(-ENOMEM); 1223414c70cbSLiam Girdwood module_put(rdev->owner); 1224414c70cbSLiam Girdwood } 1225414c70cbSLiam Girdwood 12265ffbd136SMark Brown rdev->open_count++; 12275ffbd136SMark Brown if (exclusive) { 12285ffbd136SMark Brown rdev->exclusive = 1; 12295ffbd136SMark Brown 12305ffbd136SMark Brown ret = _regulator_is_enabled(rdev); 12315ffbd136SMark Brown if (ret > 0) 12325ffbd136SMark Brown rdev->use_count = 1; 12335ffbd136SMark Brown else 12345ffbd136SMark Brown rdev->use_count = 0; 12355ffbd136SMark Brown } 12365ffbd136SMark Brown 1237a5766f11SLiam Girdwood out: 1238414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 12395ffbd136SMark Brown 1240414c70cbSLiam Girdwood return regulator; 1241414c70cbSLiam Girdwood } 12425ffbd136SMark Brown 12435ffbd136SMark Brown /** 12445ffbd136SMark Brown * regulator_get - lookup and obtain a reference to a regulator. 12455ffbd136SMark Brown * @dev: device for regulator "consumer" 12465ffbd136SMark Brown * @id: Supply name or regulator ID. 12475ffbd136SMark Brown * 12485ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 12495ffbd136SMark Brown * or IS_ERR() condition containing errno. 12505ffbd136SMark Brown * 12515ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 12525ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 12535ffbd136SMark Brown * should match the name used for the supply and/or the relevant 12545ffbd136SMark Brown * device pins in the datasheet. 12555ffbd136SMark Brown */ 12565ffbd136SMark Brown struct regulator *regulator_get(struct device *dev, const char *id) 12575ffbd136SMark Brown { 12585ffbd136SMark Brown return _regulator_get(dev, id, 0); 12595ffbd136SMark Brown } 1260414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get); 1261414c70cbSLiam Girdwood 1262414c70cbSLiam Girdwood /** 12635ffbd136SMark Brown * regulator_get_exclusive - obtain exclusive access to a regulator. 12645ffbd136SMark Brown * @dev: device for regulator "consumer" 12655ffbd136SMark Brown * @id: Supply name or regulator ID. 12665ffbd136SMark Brown * 12675ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 12685ffbd136SMark Brown * or IS_ERR() condition containing errno. Other consumers will be 12695ffbd136SMark Brown * unable to obtain this reference is held and the use count for the 12705ffbd136SMark Brown * regulator will be initialised to reflect the current state of the 12715ffbd136SMark Brown * regulator. 12725ffbd136SMark Brown * 12735ffbd136SMark Brown * This is intended for use by consumers which cannot tolerate shared 12745ffbd136SMark Brown * use of the regulator such as those which need to force the 12755ffbd136SMark Brown * regulator off for correct operation of the hardware they are 12765ffbd136SMark Brown * controlling. 12775ffbd136SMark Brown * 12785ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 12795ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 12805ffbd136SMark Brown * should match the name used for the supply and/or the relevant 12815ffbd136SMark Brown * device pins in the datasheet. 12825ffbd136SMark Brown */ 12835ffbd136SMark Brown struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 12845ffbd136SMark Brown { 12855ffbd136SMark Brown return _regulator_get(dev, id, 1); 12865ffbd136SMark Brown } 12875ffbd136SMark Brown EXPORT_SYMBOL_GPL(regulator_get_exclusive); 12885ffbd136SMark Brown 12895ffbd136SMark Brown /** 1290414c70cbSLiam Girdwood * regulator_put - "free" the regulator source 1291414c70cbSLiam Girdwood * @regulator: regulator source 1292414c70cbSLiam Girdwood * 1293414c70cbSLiam Girdwood * Note: drivers must ensure that all regulator_enable calls made on this 1294414c70cbSLiam Girdwood * regulator source are balanced by regulator_disable calls prior to calling 1295414c70cbSLiam Girdwood * this function. 1296414c70cbSLiam Girdwood */ 1297414c70cbSLiam Girdwood void regulator_put(struct regulator *regulator) 1298414c70cbSLiam Girdwood { 1299414c70cbSLiam Girdwood struct regulator_dev *rdev; 1300414c70cbSLiam Girdwood 1301414c70cbSLiam Girdwood if (regulator == NULL || IS_ERR(regulator)) 1302414c70cbSLiam Girdwood return; 1303414c70cbSLiam Girdwood 1304414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1305414c70cbSLiam Girdwood rdev = regulator->rdev; 1306414c70cbSLiam Girdwood 13075de70519SMark Brown #ifdef CONFIG_DEBUG_FS 13085de70519SMark Brown debugfs_remove_recursive(regulator->debugfs); 13095de70519SMark Brown #endif 13105de70519SMark Brown 1311414c70cbSLiam Girdwood /* remove any sysfs entries */ 1312414c70cbSLiam Girdwood if (regulator->dev) { 1313414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1314414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1315414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1316414c70cbSLiam Girdwood } 13175de70519SMark Brown kfree(regulator->supply_name); 1318414c70cbSLiam Girdwood list_del(®ulator->list); 1319414c70cbSLiam Girdwood kfree(regulator); 1320414c70cbSLiam Girdwood 13215ffbd136SMark Brown rdev->open_count--; 13225ffbd136SMark Brown rdev->exclusive = 0; 13235ffbd136SMark Brown 1324414c70cbSLiam Girdwood module_put(rdev->owner); 1325414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1326414c70cbSLiam Girdwood } 1327414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_put); 1328414c70cbSLiam Girdwood 13299a2372faSMark Brown static int _regulator_can_change_status(struct regulator_dev *rdev) 13309a2372faSMark Brown { 13319a2372faSMark Brown if (!rdev->constraints) 13329a2372faSMark Brown return 0; 13339a2372faSMark Brown 13349a2372faSMark Brown if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 13359a2372faSMark Brown return 1; 13369a2372faSMark Brown else 13379a2372faSMark Brown return 0; 13389a2372faSMark Brown } 13399a2372faSMark Brown 1340414c70cbSLiam Girdwood /* locks held by regulator_enable() */ 1341414c70cbSLiam Girdwood static int _regulator_enable(struct regulator_dev *rdev) 1342414c70cbSLiam Girdwood { 134331aae2beSMark Brown int ret, delay; 1344414c70cbSLiam Girdwood 1345414c70cbSLiam Girdwood /* check voltage and requested load before enabling */ 1346414c70cbSLiam Girdwood if (rdev->constraints && 13479a2372faSMark Brown (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1348414c70cbSLiam Girdwood drms_uA_update(rdev); 1349414c70cbSLiam Girdwood 13509a2372faSMark Brown if (rdev->use_count == 0) { 13519a2372faSMark Brown /* The regulator may on if it's not switchable or left on */ 13529a2372faSMark Brown ret = _regulator_is_enabled(rdev); 13539a2372faSMark Brown if (ret == -EINVAL || ret == 0) { 13549a2372faSMark Brown if (!_regulator_can_change_status(rdev)) 13559a2372faSMark Brown return -EPERM; 13569a2372faSMark Brown 135731aae2beSMark Brown if (!rdev->desc->ops->enable) 135831aae2beSMark Brown return -EINVAL; 135931aae2beSMark Brown 136031aae2beSMark Brown /* Query before enabling in case configuration 136125985edcSLucas De Marchi * dependent. */ 136231aae2beSMark Brown ret = _regulator_get_enable_time(rdev); 136331aae2beSMark Brown if (ret >= 0) { 136431aae2beSMark Brown delay = ret; 136531aae2beSMark Brown } else { 13665da84fd9SJoe Perches rdev_warn(rdev, "enable_time() failed: %d\n", 136731aae2beSMark Brown ret); 136831aae2beSMark Brown delay = 0; 136931aae2beSMark Brown } 137031aae2beSMark Brown 137102fa3ec0SMark Brown trace_regulator_enable(rdev_get_name(rdev)); 137202fa3ec0SMark Brown 137331aae2beSMark Brown /* Allow the regulator to ramp; it would be useful 137431aae2beSMark Brown * to extend this for bulk operations so that the 137531aae2beSMark Brown * regulators can ramp together. */ 1376414c70cbSLiam Girdwood ret = rdev->desc->ops->enable(rdev); 13779a2372faSMark Brown if (ret < 0) 13789a2372faSMark Brown return ret; 137931aae2beSMark Brown 138002fa3ec0SMark Brown trace_regulator_enable_delay(rdev_get_name(rdev)); 138102fa3ec0SMark Brown 1382e36c1df8SAxel Lin if (delay >= 1000) { 138331aae2beSMark Brown mdelay(delay / 1000); 1384e36c1df8SAxel Lin udelay(delay % 1000); 1385e36c1df8SAxel Lin } else if (delay) { 138631aae2beSMark Brown udelay(delay); 1387e36c1df8SAxel Lin } 138831aae2beSMark Brown 138902fa3ec0SMark Brown trace_regulator_enable_complete(rdev_get_name(rdev)); 139002fa3ec0SMark Brown 1391a7433cffSLinus Walleij } else if (ret < 0) { 13925da84fd9SJoe Perches rdev_err(rdev, "is_enabled() failed: %d\n", ret); 1393414c70cbSLiam Girdwood return ret; 1394414c70cbSLiam Girdwood } 1395a7433cffSLinus Walleij /* Fallthrough on positive return values - already enabled */ 1396414c70cbSLiam Girdwood } 1397414c70cbSLiam Girdwood 13989a2372faSMark Brown rdev->use_count++; 13999a2372faSMark Brown 14009a2372faSMark Brown return 0; 1401414c70cbSLiam Girdwood } 1402414c70cbSLiam Girdwood 1403414c70cbSLiam Girdwood /** 1404414c70cbSLiam Girdwood * regulator_enable - enable regulator output 1405414c70cbSLiam Girdwood * @regulator: regulator source 1406414c70cbSLiam Girdwood * 1407cf7bbcdfSMark Brown * Request that the regulator be enabled with the regulator output at 1408cf7bbcdfSMark Brown * the predefined voltage or current value. Calls to regulator_enable() 1409cf7bbcdfSMark Brown * must be balanced with calls to regulator_disable(). 1410cf7bbcdfSMark Brown * 1411414c70cbSLiam Girdwood * NOTE: the output value can be set by other drivers, boot loader or may be 1412cf7bbcdfSMark Brown * hardwired in the regulator. 1413414c70cbSLiam Girdwood */ 1414414c70cbSLiam Girdwood int regulator_enable(struct regulator *regulator) 1415414c70cbSLiam Girdwood { 1416412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1417412aec61SDavid Brownell int ret = 0; 1418414c70cbSLiam Girdwood 14193801b86aSMark Brown if (rdev->supply) { 14203801b86aSMark Brown ret = regulator_enable(rdev->supply); 14213801b86aSMark Brown if (ret != 0) 14223801b86aSMark Brown return ret; 14233801b86aSMark Brown } 14243801b86aSMark Brown 1425412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1426412aec61SDavid Brownell ret = _regulator_enable(rdev); 1427412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 14283801b86aSMark Brown 1429d1685e4eSHeiko Stübner if (ret != 0 && rdev->supply) 14303801b86aSMark Brown regulator_disable(rdev->supply); 14313801b86aSMark Brown 1432414c70cbSLiam Girdwood return ret; 1433414c70cbSLiam Girdwood } 1434414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_enable); 1435414c70cbSLiam Girdwood 1436414c70cbSLiam Girdwood /* locks held by regulator_disable() */ 14373801b86aSMark Brown static int _regulator_disable(struct regulator_dev *rdev) 1438414c70cbSLiam Girdwood { 1439414c70cbSLiam Girdwood int ret = 0; 1440414c70cbSLiam Girdwood 1441cd94b505SDavid Brownell if (WARN(rdev->use_count <= 0, 144243e7ee33SJoe Perches "unbalanced disables for %s\n", rdev_get_name(rdev))) 1443cd94b505SDavid Brownell return -EIO; 1444cd94b505SDavid Brownell 1445414c70cbSLiam Girdwood /* are we the last user and permitted to disable ? */ 144660ef66fcSMark Brown if (rdev->use_count == 1 && 144760ef66fcSMark Brown (rdev->constraints && !rdev->constraints->always_on)) { 1448414c70cbSLiam Girdwood 1449414c70cbSLiam Girdwood /* we are last user */ 14509a2372faSMark Brown if (_regulator_can_change_status(rdev) && 14519a2372faSMark Brown rdev->desc->ops->disable) { 145202fa3ec0SMark Brown trace_regulator_disable(rdev_get_name(rdev)); 145302fa3ec0SMark Brown 1454414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1455414c70cbSLiam Girdwood if (ret < 0) { 14565da84fd9SJoe Perches rdev_err(rdev, "failed to disable\n"); 1457414c70cbSLiam Girdwood return ret; 1458414c70cbSLiam Girdwood } 145984b68263SMark Brown 146002fa3ec0SMark Brown trace_regulator_disable_complete(rdev_get_name(rdev)); 146102fa3ec0SMark Brown 146284b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 146384b68263SMark Brown NULL); 1464414c70cbSLiam Girdwood } 1465414c70cbSLiam Girdwood 1466414c70cbSLiam Girdwood rdev->use_count = 0; 1467414c70cbSLiam Girdwood } else if (rdev->use_count > 1) { 1468414c70cbSLiam Girdwood 1469414c70cbSLiam Girdwood if (rdev->constraints && 1470414c70cbSLiam Girdwood (rdev->constraints->valid_ops_mask & 1471414c70cbSLiam Girdwood REGULATOR_CHANGE_DRMS)) 1472414c70cbSLiam Girdwood drms_uA_update(rdev); 1473414c70cbSLiam Girdwood 1474414c70cbSLiam Girdwood rdev->use_count--; 1475414c70cbSLiam Girdwood } 14763801b86aSMark Brown 1477414c70cbSLiam Girdwood return ret; 1478414c70cbSLiam Girdwood } 1479414c70cbSLiam Girdwood 1480414c70cbSLiam Girdwood /** 1481414c70cbSLiam Girdwood * regulator_disable - disable regulator output 1482414c70cbSLiam Girdwood * @regulator: regulator source 1483414c70cbSLiam Girdwood * 1484cf7bbcdfSMark Brown * Disable the regulator output voltage or current. Calls to 1485cf7bbcdfSMark Brown * regulator_enable() must be balanced with calls to 1486cf7bbcdfSMark Brown * regulator_disable(). 148769279fb9SMark Brown * 1488414c70cbSLiam Girdwood * NOTE: this will only disable the regulator output if no other consumer 1489cf7bbcdfSMark Brown * devices have it enabled, the regulator device supports disabling and 1490cf7bbcdfSMark Brown * machine constraints permit this operation. 1491414c70cbSLiam Girdwood */ 1492414c70cbSLiam Girdwood int regulator_disable(struct regulator *regulator) 1493414c70cbSLiam Girdwood { 1494412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1495412aec61SDavid Brownell int ret = 0; 1496414c70cbSLiam Girdwood 1497412aec61SDavid Brownell mutex_lock(&rdev->mutex); 14983801b86aSMark Brown ret = _regulator_disable(rdev); 1499412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 15008cbf811dSJeffrey Carlyle 15013801b86aSMark Brown if (ret == 0 && rdev->supply) 15023801b86aSMark Brown regulator_disable(rdev->supply); 15038cbf811dSJeffrey Carlyle 1504414c70cbSLiam Girdwood return ret; 1505414c70cbSLiam Girdwood } 1506414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_disable); 1507414c70cbSLiam Girdwood 1508414c70cbSLiam Girdwood /* locks held by regulator_force_disable() */ 15093801b86aSMark Brown static int _regulator_force_disable(struct regulator_dev *rdev) 1510414c70cbSLiam Girdwood { 1511414c70cbSLiam Girdwood int ret = 0; 1512414c70cbSLiam Girdwood 1513414c70cbSLiam Girdwood /* force disable */ 1514414c70cbSLiam Girdwood if (rdev->desc->ops->disable) { 1515414c70cbSLiam Girdwood /* ah well, who wants to live forever... */ 1516414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1517414c70cbSLiam Girdwood if (ret < 0) { 15185da84fd9SJoe Perches rdev_err(rdev, "failed to force disable\n"); 1519414c70cbSLiam Girdwood return ret; 1520414c70cbSLiam Girdwood } 1521414c70cbSLiam Girdwood /* notify other consumers that power has been forced off */ 152284b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 152384b68263SMark Brown REGULATOR_EVENT_DISABLE, NULL); 1524414c70cbSLiam Girdwood } 1525414c70cbSLiam Girdwood 1526414c70cbSLiam Girdwood return ret; 1527414c70cbSLiam Girdwood } 1528414c70cbSLiam Girdwood 1529414c70cbSLiam Girdwood /** 1530414c70cbSLiam Girdwood * regulator_force_disable - force disable regulator output 1531414c70cbSLiam Girdwood * @regulator: regulator source 1532414c70cbSLiam Girdwood * 1533414c70cbSLiam Girdwood * Forcibly disable the regulator output voltage or current. 1534414c70cbSLiam Girdwood * NOTE: this *will* disable the regulator output even if other consumer 1535414c70cbSLiam Girdwood * devices have it enabled. This should be used for situations when device 1536414c70cbSLiam Girdwood * damage will likely occur if the regulator is not disabled (e.g. over temp). 1537414c70cbSLiam Girdwood */ 1538414c70cbSLiam Girdwood int regulator_force_disable(struct regulator *regulator) 1539414c70cbSLiam Girdwood { 154082d15839SMark Brown struct regulator_dev *rdev = regulator->rdev; 1541414c70cbSLiam Girdwood int ret; 1542414c70cbSLiam Girdwood 154382d15839SMark Brown mutex_lock(&rdev->mutex); 1544414c70cbSLiam Girdwood regulator->uA_load = 0; 15453801b86aSMark Brown ret = _regulator_force_disable(regulator->rdev); 154682d15839SMark Brown mutex_unlock(&rdev->mutex); 15478cbf811dSJeffrey Carlyle 15483801b86aSMark Brown if (rdev->supply) 15493801b86aSMark Brown while (rdev->open_count--) 15503801b86aSMark Brown regulator_disable(rdev->supply); 15518cbf811dSJeffrey Carlyle 1552414c70cbSLiam Girdwood return ret; 1553414c70cbSLiam Girdwood } 1554414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_force_disable); 1555414c70cbSLiam Girdwood 1556da07ecd9SMark Brown static void regulator_disable_work(struct work_struct *work) 1557da07ecd9SMark Brown { 1558da07ecd9SMark Brown struct regulator_dev *rdev = container_of(work, struct regulator_dev, 1559da07ecd9SMark Brown disable_work.work); 1560da07ecd9SMark Brown int count, i, ret; 1561da07ecd9SMark Brown 1562da07ecd9SMark Brown mutex_lock(&rdev->mutex); 1563da07ecd9SMark Brown 1564da07ecd9SMark Brown BUG_ON(!rdev->deferred_disables); 1565da07ecd9SMark Brown 1566da07ecd9SMark Brown count = rdev->deferred_disables; 1567da07ecd9SMark Brown rdev->deferred_disables = 0; 1568da07ecd9SMark Brown 1569da07ecd9SMark Brown for (i = 0; i < count; i++) { 1570da07ecd9SMark Brown ret = _regulator_disable(rdev); 1571da07ecd9SMark Brown if (ret != 0) 1572da07ecd9SMark Brown rdev_err(rdev, "Deferred disable failed: %d\n", ret); 1573da07ecd9SMark Brown } 1574da07ecd9SMark Brown 1575da07ecd9SMark Brown mutex_unlock(&rdev->mutex); 1576da07ecd9SMark Brown 1577da07ecd9SMark Brown if (rdev->supply) { 1578da07ecd9SMark Brown for (i = 0; i < count; i++) { 1579da07ecd9SMark Brown ret = regulator_disable(rdev->supply); 1580da07ecd9SMark Brown if (ret != 0) { 1581da07ecd9SMark Brown rdev_err(rdev, 1582da07ecd9SMark Brown "Supply disable failed: %d\n", ret); 1583da07ecd9SMark Brown } 1584da07ecd9SMark Brown } 1585da07ecd9SMark Brown } 1586da07ecd9SMark Brown } 1587da07ecd9SMark Brown 1588da07ecd9SMark Brown /** 1589da07ecd9SMark Brown * regulator_disable_deferred - disable regulator output with delay 1590da07ecd9SMark Brown * @regulator: regulator source 1591da07ecd9SMark Brown * @ms: miliseconds until the regulator is disabled 1592da07ecd9SMark Brown * 1593da07ecd9SMark Brown * Execute regulator_disable() on the regulator after a delay. This 1594da07ecd9SMark Brown * is intended for use with devices that require some time to quiesce. 1595da07ecd9SMark Brown * 1596da07ecd9SMark Brown * NOTE: this will only disable the regulator output if no other consumer 1597da07ecd9SMark Brown * devices have it enabled, the regulator device supports disabling and 1598da07ecd9SMark Brown * machine constraints permit this operation. 1599da07ecd9SMark Brown */ 1600da07ecd9SMark Brown int regulator_disable_deferred(struct regulator *regulator, int ms) 1601da07ecd9SMark Brown { 1602da07ecd9SMark Brown struct regulator_dev *rdev = regulator->rdev; 1603aa59802dSMark Brown int ret; 1604da07ecd9SMark Brown 1605da07ecd9SMark Brown mutex_lock(&rdev->mutex); 1606da07ecd9SMark Brown rdev->deferred_disables++; 1607da07ecd9SMark Brown mutex_unlock(&rdev->mutex); 1608da07ecd9SMark Brown 1609aa59802dSMark Brown ret = schedule_delayed_work(&rdev->disable_work, 1610da07ecd9SMark Brown msecs_to_jiffies(ms)); 1611aa59802dSMark Brown if (ret < 0) 1612aa59802dSMark Brown return ret; 1613aa59802dSMark Brown else 1614aa59802dSMark Brown return 0; 1615da07ecd9SMark Brown } 1616da07ecd9SMark Brown EXPORT_SYMBOL_GPL(regulator_disable_deferred); 1617da07ecd9SMark Brown 1618414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev) 1619414c70cbSLiam Girdwood { 16209a7f6a4cSMark Brown /* If we don't know then assume that the regulator is always on */ 16219332546fSMark Brown if (!rdev->desc->ops->is_enabled) 16229a7f6a4cSMark Brown return 1; 1623414c70cbSLiam Girdwood 16249332546fSMark Brown return rdev->desc->ops->is_enabled(rdev); 1625414c70cbSLiam Girdwood } 1626414c70cbSLiam Girdwood 1627414c70cbSLiam Girdwood /** 1628414c70cbSLiam Girdwood * regulator_is_enabled - is the regulator output enabled 1629414c70cbSLiam Girdwood * @regulator: regulator source 1630414c70cbSLiam Girdwood * 1631412aec61SDavid Brownell * Returns positive if the regulator driver backing the source/client 1632412aec61SDavid Brownell * has requested that the device be enabled, zero if it hasn't, else a 1633412aec61SDavid Brownell * negative errno code. 1634412aec61SDavid Brownell * 1635412aec61SDavid Brownell * Note that the device backing this regulator handle can have multiple 1636412aec61SDavid Brownell * users, so it might be enabled even if regulator_enable() was never 1637412aec61SDavid Brownell * called for this particular source. 1638414c70cbSLiam Girdwood */ 1639414c70cbSLiam Girdwood int regulator_is_enabled(struct regulator *regulator) 1640414c70cbSLiam Girdwood { 16419332546fSMark Brown int ret; 16429332546fSMark Brown 16439332546fSMark Brown mutex_lock(®ulator->rdev->mutex); 16449332546fSMark Brown ret = _regulator_is_enabled(regulator->rdev); 16459332546fSMark Brown mutex_unlock(®ulator->rdev->mutex); 16469332546fSMark Brown 16479332546fSMark Brown return ret; 1648414c70cbSLiam Girdwood } 1649414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_is_enabled); 1650414c70cbSLiam Girdwood 1651414c70cbSLiam Girdwood /** 16524367cfdcSDavid Brownell * regulator_count_voltages - count regulator_list_voltage() selectors 16534367cfdcSDavid Brownell * @regulator: regulator source 16544367cfdcSDavid Brownell * 16554367cfdcSDavid Brownell * Returns number of selectors, or negative errno. Selectors are 16564367cfdcSDavid Brownell * numbered starting at zero, and typically correspond to bitfields 16574367cfdcSDavid Brownell * in hardware registers. 16584367cfdcSDavid Brownell */ 16594367cfdcSDavid Brownell int regulator_count_voltages(struct regulator *regulator) 16604367cfdcSDavid Brownell { 16614367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 16624367cfdcSDavid Brownell 16634367cfdcSDavid Brownell return rdev->desc->n_voltages ? : -EINVAL; 16644367cfdcSDavid Brownell } 16654367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_count_voltages); 16664367cfdcSDavid Brownell 16674367cfdcSDavid Brownell /** 16684367cfdcSDavid Brownell * regulator_list_voltage - enumerate supported voltages 16694367cfdcSDavid Brownell * @regulator: regulator source 16704367cfdcSDavid Brownell * @selector: identify voltage to list 16714367cfdcSDavid Brownell * Context: can sleep 16724367cfdcSDavid Brownell * 16734367cfdcSDavid Brownell * Returns a voltage that can be passed to @regulator_set_voltage(), 167488393161SThomas Weber * zero if this selector code can't be used on this system, or a 16754367cfdcSDavid Brownell * negative errno. 16764367cfdcSDavid Brownell */ 16774367cfdcSDavid Brownell int regulator_list_voltage(struct regulator *regulator, unsigned selector) 16784367cfdcSDavid Brownell { 16794367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 16804367cfdcSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 16814367cfdcSDavid Brownell int ret; 16824367cfdcSDavid Brownell 16834367cfdcSDavid Brownell if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 16844367cfdcSDavid Brownell return -EINVAL; 16854367cfdcSDavid Brownell 16864367cfdcSDavid Brownell mutex_lock(&rdev->mutex); 16874367cfdcSDavid Brownell ret = ops->list_voltage(rdev, selector); 16884367cfdcSDavid Brownell mutex_unlock(&rdev->mutex); 16894367cfdcSDavid Brownell 16904367cfdcSDavid Brownell if (ret > 0) { 16914367cfdcSDavid Brownell if (ret < rdev->constraints->min_uV) 16924367cfdcSDavid Brownell ret = 0; 16934367cfdcSDavid Brownell else if (ret > rdev->constraints->max_uV) 16944367cfdcSDavid Brownell ret = 0; 16954367cfdcSDavid Brownell } 16964367cfdcSDavid Brownell 16974367cfdcSDavid Brownell return ret; 16984367cfdcSDavid Brownell } 16994367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_list_voltage); 17004367cfdcSDavid Brownell 17014367cfdcSDavid Brownell /** 1702a7a1ad90SMark Brown * regulator_is_supported_voltage - check if a voltage range can be supported 1703a7a1ad90SMark Brown * 1704a7a1ad90SMark Brown * @regulator: Regulator to check. 1705a7a1ad90SMark Brown * @min_uV: Minimum required voltage in uV. 1706a7a1ad90SMark Brown * @max_uV: Maximum required voltage in uV. 1707a7a1ad90SMark Brown * 1708a7a1ad90SMark Brown * Returns a boolean or a negative error code. 1709a7a1ad90SMark Brown */ 1710a7a1ad90SMark Brown int regulator_is_supported_voltage(struct regulator *regulator, 1711a7a1ad90SMark Brown int min_uV, int max_uV) 1712a7a1ad90SMark Brown { 1713a7a1ad90SMark Brown int i, voltages, ret; 1714a7a1ad90SMark Brown 1715a7a1ad90SMark Brown ret = regulator_count_voltages(regulator); 1716a7a1ad90SMark Brown if (ret < 0) 1717a7a1ad90SMark Brown return ret; 1718a7a1ad90SMark Brown voltages = ret; 1719a7a1ad90SMark Brown 1720a7a1ad90SMark Brown for (i = 0; i < voltages; i++) { 1721a7a1ad90SMark Brown ret = regulator_list_voltage(regulator, i); 1722a7a1ad90SMark Brown 1723a7a1ad90SMark Brown if (ret >= min_uV && ret <= max_uV) 1724a7a1ad90SMark Brown return 1; 1725a7a1ad90SMark Brown } 1726a7a1ad90SMark Brown 1727a7a1ad90SMark Brown return 0; 1728a7a1ad90SMark Brown } 1729a7a1ad90SMark Brown 173075790251SMark Brown static int _regulator_do_set_voltage(struct regulator_dev *rdev, 173175790251SMark Brown int min_uV, int max_uV) 173275790251SMark Brown { 173375790251SMark Brown int ret; 173477af1b26SLinus Walleij int delay = 0; 173575790251SMark Brown unsigned int selector; 173675790251SMark Brown 173775790251SMark Brown trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 173875790251SMark Brown 1739bf5892a8SMark Brown min_uV += rdev->constraints->uV_offset; 1740bf5892a8SMark Brown max_uV += rdev->constraints->uV_offset; 1741bf5892a8SMark Brown 174275790251SMark Brown if (rdev->desc->ops->set_voltage) { 174375790251SMark Brown ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, 174475790251SMark Brown &selector); 174575790251SMark Brown 174675790251SMark Brown if (rdev->desc->ops->list_voltage) 174775790251SMark Brown selector = rdev->desc->ops->list_voltage(rdev, 174875790251SMark Brown selector); 174975790251SMark Brown else 175075790251SMark Brown selector = -1; 1751e8eef82bSMark Brown } else if (rdev->desc->ops->set_voltage_sel) { 1752e8eef82bSMark Brown int best_val = INT_MAX; 1753e8eef82bSMark Brown int i; 1754e8eef82bSMark Brown 1755e8eef82bSMark Brown selector = 0; 1756e8eef82bSMark Brown 1757e8eef82bSMark Brown /* Find the smallest voltage that falls within the specified 1758e8eef82bSMark Brown * range. 1759e8eef82bSMark Brown */ 1760e8eef82bSMark Brown for (i = 0; i < rdev->desc->n_voltages; i++) { 1761e8eef82bSMark Brown ret = rdev->desc->ops->list_voltage(rdev, i); 1762e8eef82bSMark Brown if (ret < 0) 1763e8eef82bSMark Brown continue; 1764e8eef82bSMark Brown 1765e8eef82bSMark Brown if (ret < best_val && ret >= min_uV && ret <= max_uV) { 1766e8eef82bSMark Brown best_val = ret; 1767e8eef82bSMark Brown selector = i; 1768e8eef82bSMark Brown } 1769e8eef82bSMark Brown } 1770e8eef82bSMark Brown 177177af1b26SLinus Walleij /* 177277af1b26SLinus Walleij * If we can't obtain the old selector there is not enough 177377af1b26SLinus Walleij * info to call set_voltage_time_sel(). 177477af1b26SLinus Walleij */ 177577af1b26SLinus Walleij if (rdev->desc->ops->set_voltage_time_sel && 177677af1b26SLinus Walleij rdev->desc->ops->get_voltage_sel) { 177777af1b26SLinus Walleij unsigned int old_selector = 0; 177877af1b26SLinus Walleij 177977af1b26SLinus Walleij ret = rdev->desc->ops->get_voltage_sel(rdev); 178077af1b26SLinus Walleij if (ret < 0) 178177af1b26SLinus Walleij return ret; 178277af1b26SLinus Walleij old_selector = ret; 178377af1b26SLinus Walleij delay = rdev->desc->ops->set_voltage_time_sel(rdev, 178477af1b26SLinus Walleij old_selector, selector); 178577af1b26SLinus Walleij } 178677af1b26SLinus Walleij 1787e8eef82bSMark Brown if (best_val != INT_MAX) { 1788e8eef82bSMark Brown ret = rdev->desc->ops->set_voltage_sel(rdev, selector); 1789e8eef82bSMark Brown selector = best_val; 1790e8eef82bSMark Brown } else { 1791e8eef82bSMark Brown ret = -EINVAL; 1792e8eef82bSMark Brown } 179375790251SMark Brown } else { 179475790251SMark Brown ret = -EINVAL; 179575790251SMark Brown } 179675790251SMark Brown 179777af1b26SLinus Walleij /* Insert any necessary delays */ 179877af1b26SLinus Walleij if (delay >= 1000) { 179977af1b26SLinus Walleij mdelay(delay / 1000); 180077af1b26SLinus Walleij udelay(delay % 1000); 180177af1b26SLinus Walleij } else if (delay) { 180277af1b26SLinus Walleij udelay(delay); 180377af1b26SLinus Walleij } 180477af1b26SLinus Walleij 1805ded06a52SMark Brown if (ret == 0) 1806ded06a52SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, 1807ded06a52SMark Brown NULL); 1808ded06a52SMark Brown 180975790251SMark Brown trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 181075790251SMark Brown 181175790251SMark Brown return ret; 181275790251SMark Brown } 181375790251SMark Brown 1814a7a1ad90SMark Brown /** 1815414c70cbSLiam Girdwood * regulator_set_voltage - set regulator output voltage 1816414c70cbSLiam Girdwood * @regulator: regulator source 1817414c70cbSLiam Girdwood * @min_uV: Minimum required voltage in uV 1818414c70cbSLiam Girdwood * @max_uV: Maximum acceptable voltage in uV 1819414c70cbSLiam Girdwood * 1820414c70cbSLiam Girdwood * Sets a voltage regulator to the desired output voltage. This can be set 1821414c70cbSLiam Girdwood * during any regulator state. IOW, regulator can be disabled or enabled. 1822414c70cbSLiam Girdwood * 1823414c70cbSLiam Girdwood * If the regulator is enabled then the voltage will change to the new value 1824414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1825414c70cbSLiam Girdwood * output at the new voltage when enabled. 1826414c70cbSLiam Girdwood * 1827414c70cbSLiam Girdwood * NOTE: If the regulator is shared between several devices then the lowest 1828414c70cbSLiam Girdwood * request voltage that meets the system constraints will be used. 182969279fb9SMark Brown * Regulator system constraints must be set for this regulator before 1830414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1831414c70cbSLiam Girdwood */ 1832414c70cbSLiam Girdwood int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1833414c70cbSLiam Girdwood { 1834414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 183595a3c23aSMark Brown int ret = 0; 1836414c70cbSLiam Girdwood 1837414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1838414c70cbSLiam Girdwood 183995a3c23aSMark Brown /* If we're setting the same range as last time the change 184095a3c23aSMark Brown * should be a noop (some cpufreq implementations use the same 184195a3c23aSMark Brown * voltage for multiple frequencies, for example). 184295a3c23aSMark Brown */ 184395a3c23aSMark Brown if (regulator->min_uV == min_uV && regulator->max_uV == max_uV) 184495a3c23aSMark Brown goto out; 184595a3c23aSMark Brown 1846414c70cbSLiam Girdwood /* sanity check */ 1847e8eef82bSMark Brown if (!rdev->desc->ops->set_voltage && 1848e8eef82bSMark Brown !rdev->desc->ops->set_voltage_sel) { 1849414c70cbSLiam Girdwood ret = -EINVAL; 1850414c70cbSLiam Girdwood goto out; 1851414c70cbSLiam Girdwood } 1852414c70cbSLiam Girdwood 1853414c70cbSLiam Girdwood /* constraints check */ 1854414c70cbSLiam Girdwood ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1855414c70cbSLiam Girdwood if (ret < 0) 1856414c70cbSLiam Girdwood goto out; 1857414c70cbSLiam Girdwood regulator->min_uV = min_uV; 1858414c70cbSLiam Girdwood regulator->max_uV = max_uV; 18593a93f2a9SMark Brown 186005fda3b1SThomas Petazzoni ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 186105fda3b1SThomas Petazzoni if (ret < 0) 186205fda3b1SThomas Petazzoni goto out; 186305fda3b1SThomas Petazzoni 186475790251SMark Brown ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 186502fa3ec0SMark Brown 1866414c70cbSLiam Girdwood out: 1867414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1868414c70cbSLiam Girdwood return ret; 1869414c70cbSLiam Girdwood } 1870414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_voltage); 1871414c70cbSLiam Girdwood 1872606a2562SMark Brown /** 187388cd222bSLinus Walleij * regulator_set_voltage_time - get raise/fall time 187488cd222bSLinus Walleij * @regulator: regulator source 187588cd222bSLinus Walleij * @old_uV: starting voltage in microvolts 187688cd222bSLinus Walleij * @new_uV: target voltage in microvolts 187788cd222bSLinus Walleij * 187888cd222bSLinus Walleij * Provided with the starting and ending voltage, this function attempts to 187988cd222bSLinus Walleij * calculate the time in microseconds required to rise or fall to this new 188088cd222bSLinus Walleij * voltage. 188188cd222bSLinus Walleij */ 188288cd222bSLinus Walleij int regulator_set_voltage_time(struct regulator *regulator, 188388cd222bSLinus Walleij int old_uV, int new_uV) 188488cd222bSLinus Walleij { 188588cd222bSLinus Walleij struct regulator_dev *rdev = regulator->rdev; 188688cd222bSLinus Walleij struct regulator_ops *ops = rdev->desc->ops; 188788cd222bSLinus Walleij int old_sel = -1; 188888cd222bSLinus Walleij int new_sel = -1; 188988cd222bSLinus Walleij int voltage; 189088cd222bSLinus Walleij int i; 189188cd222bSLinus Walleij 189288cd222bSLinus Walleij /* Currently requires operations to do this */ 189388cd222bSLinus Walleij if (!ops->list_voltage || !ops->set_voltage_time_sel 189488cd222bSLinus Walleij || !rdev->desc->n_voltages) 189588cd222bSLinus Walleij return -EINVAL; 189688cd222bSLinus Walleij 189788cd222bSLinus Walleij for (i = 0; i < rdev->desc->n_voltages; i++) { 189888cd222bSLinus Walleij /* We only look for exact voltage matches here */ 189988cd222bSLinus Walleij voltage = regulator_list_voltage(regulator, i); 190088cd222bSLinus Walleij if (voltage < 0) 190188cd222bSLinus Walleij return -EINVAL; 190288cd222bSLinus Walleij if (voltage == 0) 190388cd222bSLinus Walleij continue; 190488cd222bSLinus Walleij if (voltage == old_uV) 190588cd222bSLinus Walleij old_sel = i; 190688cd222bSLinus Walleij if (voltage == new_uV) 190788cd222bSLinus Walleij new_sel = i; 190888cd222bSLinus Walleij } 190988cd222bSLinus Walleij 191088cd222bSLinus Walleij if (old_sel < 0 || new_sel < 0) 191188cd222bSLinus Walleij return -EINVAL; 191288cd222bSLinus Walleij 191388cd222bSLinus Walleij return ops->set_voltage_time_sel(rdev, old_sel, new_sel); 191488cd222bSLinus Walleij } 191588cd222bSLinus Walleij EXPORT_SYMBOL_GPL(regulator_set_voltage_time); 191688cd222bSLinus Walleij 191788cd222bSLinus Walleij /** 1918606a2562SMark Brown * regulator_sync_voltage - re-apply last regulator output voltage 1919606a2562SMark Brown * @regulator: regulator source 1920606a2562SMark Brown * 1921606a2562SMark Brown * Re-apply the last configured voltage. This is intended to be used 1922606a2562SMark Brown * where some external control source the consumer is cooperating with 1923606a2562SMark Brown * has caused the configured voltage to change. 1924606a2562SMark Brown */ 1925606a2562SMark Brown int regulator_sync_voltage(struct regulator *regulator) 1926606a2562SMark Brown { 1927606a2562SMark Brown struct regulator_dev *rdev = regulator->rdev; 1928606a2562SMark Brown int ret, min_uV, max_uV; 1929606a2562SMark Brown 1930606a2562SMark Brown mutex_lock(&rdev->mutex); 1931606a2562SMark Brown 1932606a2562SMark Brown if (!rdev->desc->ops->set_voltage && 1933606a2562SMark Brown !rdev->desc->ops->set_voltage_sel) { 1934606a2562SMark Brown ret = -EINVAL; 1935606a2562SMark Brown goto out; 1936606a2562SMark Brown } 1937606a2562SMark Brown 1938606a2562SMark Brown /* This is only going to work if we've had a voltage configured. */ 1939606a2562SMark Brown if (!regulator->min_uV && !regulator->max_uV) { 1940606a2562SMark Brown ret = -EINVAL; 1941606a2562SMark Brown goto out; 1942606a2562SMark Brown } 1943606a2562SMark Brown 1944606a2562SMark Brown min_uV = regulator->min_uV; 1945606a2562SMark Brown max_uV = regulator->max_uV; 1946606a2562SMark Brown 1947606a2562SMark Brown /* This should be a paranoia check... */ 1948606a2562SMark Brown ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1949606a2562SMark Brown if (ret < 0) 1950606a2562SMark Brown goto out; 1951606a2562SMark Brown 1952606a2562SMark Brown ret = regulator_check_consumers(rdev, &min_uV, &max_uV); 1953606a2562SMark Brown if (ret < 0) 1954606a2562SMark Brown goto out; 1955606a2562SMark Brown 1956606a2562SMark Brown ret = _regulator_do_set_voltage(rdev, min_uV, max_uV); 1957606a2562SMark Brown 1958606a2562SMark Brown out: 1959606a2562SMark Brown mutex_unlock(&rdev->mutex); 1960606a2562SMark Brown return ret; 1961606a2562SMark Brown } 1962606a2562SMark Brown EXPORT_SYMBOL_GPL(regulator_sync_voltage); 1963606a2562SMark Brown 1964414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev) 1965414c70cbSLiam Girdwood { 1966bf5892a8SMark Brown int sel, ret; 1967476c2d83SMark Brown 1968476c2d83SMark Brown if (rdev->desc->ops->get_voltage_sel) { 1969476c2d83SMark Brown sel = rdev->desc->ops->get_voltage_sel(rdev); 1970476c2d83SMark Brown if (sel < 0) 1971476c2d83SMark Brown return sel; 1972bf5892a8SMark Brown ret = rdev->desc->ops->list_voltage(rdev, sel); 1973cb220d16SAxel Lin } else if (rdev->desc->ops->get_voltage) { 1974bf5892a8SMark Brown ret = rdev->desc->ops->get_voltage(rdev); 1975cb220d16SAxel Lin } else { 1976414c70cbSLiam Girdwood return -EINVAL; 1977cb220d16SAxel Lin } 1978bf5892a8SMark Brown 1979cb220d16SAxel Lin if (ret < 0) 1980cb220d16SAxel Lin return ret; 1981bf5892a8SMark Brown return ret - rdev->constraints->uV_offset; 1982414c70cbSLiam Girdwood } 1983414c70cbSLiam Girdwood 1984414c70cbSLiam Girdwood /** 1985414c70cbSLiam Girdwood * regulator_get_voltage - get regulator output voltage 1986414c70cbSLiam Girdwood * @regulator: regulator source 1987414c70cbSLiam Girdwood * 1988414c70cbSLiam Girdwood * This returns the current regulator voltage in uV. 1989414c70cbSLiam Girdwood * 1990414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the voltage value. This 1991414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1992414c70cbSLiam Girdwood */ 1993414c70cbSLiam Girdwood int regulator_get_voltage(struct regulator *regulator) 1994414c70cbSLiam Girdwood { 1995414c70cbSLiam Girdwood int ret; 1996414c70cbSLiam Girdwood 1997414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1998414c70cbSLiam Girdwood 1999414c70cbSLiam Girdwood ret = _regulator_get_voltage(regulator->rdev); 2000414c70cbSLiam Girdwood 2001414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 2002414c70cbSLiam Girdwood 2003414c70cbSLiam Girdwood return ret; 2004414c70cbSLiam Girdwood } 2005414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_voltage); 2006414c70cbSLiam Girdwood 2007414c70cbSLiam Girdwood /** 2008414c70cbSLiam Girdwood * regulator_set_current_limit - set regulator output current limit 2009414c70cbSLiam Girdwood * @regulator: regulator source 2010414c70cbSLiam Girdwood * @min_uA: Minimuum supported current in uA 2011414c70cbSLiam Girdwood * @max_uA: Maximum supported current in uA 2012414c70cbSLiam Girdwood * 2013414c70cbSLiam Girdwood * Sets current sink to the desired output current. This can be set during 2014414c70cbSLiam Girdwood * any regulator state. IOW, regulator can be disabled or enabled. 2015414c70cbSLiam Girdwood * 2016414c70cbSLiam Girdwood * If the regulator is enabled then the current will change to the new value 2017414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 2018414c70cbSLiam Girdwood * output at the new current when enabled. 2019414c70cbSLiam Girdwood * 2020414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 2021414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 2022414c70cbSLiam Girdwood */ 2023414c70cbSLiam Girdwood int regulator_set_current_limit(struct regulator *regulator, 2024414c70cbSLiam Girdwood int min_uA, int max_uA) 2025414c70cbSLiam Girdwood { 2026414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2027414c70cbSLiam Girdwood int ret; 2028414c70cbSLiam Girdwood 2029414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2030414c70cbSLiam Girdwood 2031414c70cbSLiam Girdwood /* sanity check */ 2032414c70cbSLiam Girdwood if (!rdev->desc->ops->set_current_limit) { 2033414c70cbSLiam Girdwood ret = -EINVAL; 2034414c70cbSLiam Girdwood goto out; 2035414c70cbSLiam Girdwood } 2036414c70cbSLiam Girdwood 2037414c70cbSLiam Girdwood /* constraints check */ 2038414c70cbSLiam Girdwood ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 2039414c70cbSLiam Girdwood if (ret < 0) 2040414c70cbSLiam Girdwood goto out; 2041414c70cbSLiam Girdwood 2042414c70cbSLiam Girdwood ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 2043414c70cbSLiam Girdwood out: 2044414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2045414c70cbSLiam Girdwood return ret; 2046414c70cbSLiam Girdwood } 2047414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_current_limit); 2048414c70cbSLiam Girdwood 2049414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev) 2050414c70cbSLiam Girdwood { 2051414c70cbSLiam Girdwood int ret; 2052414c70cbSLiam Girdwood 2053414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2054414c70cbSLiam Girdwood 2055414c70cbSLiam Girdwood /* sanity check */ 2056414c70cbSLiam Girdwood if (!rdev->desc->ops->get_current_limit) { 2057414c70cbSLiam Girdwood ret = -EINVAL; 2058414c70cbSLiam Girdwood goto out; 2059414c70cbSLiam Girdwood } 2060414c70cbSLiam Girdwood 2061414c70cbSLiam Girdwood ret = rdev->desc->ops->get_current_limit(rdev); 2062414c70cbSLiam Girdwood out: 2063414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2064414c70cbSLiam Girdwood return ret; 2065414c70cbSLiam Girdwood } 2066414c70cbSLiam Girdwood 2067414c70cbSLiam Girdwood /** 2068414c70cbSLiam Girdwood * regulator_get_current_limit - get regulator output current 2069414c70cbSLiam Girdwood * @regulator: regulator source 2070414c70cbSLiam Girdwood * 2071414c70cbSLiam Girdwood * This returns the current supplied by the specified current sink in uA. 2072414c70cbSLiam Girdwood * 2073414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the current value. This 2074414c70cbSLiam Girdwood * function should not be used to determine regulator state. 2075414c70cbSLiam Girdwood */ 2076414c70cbSLiam Girdwood int regulator_get_current_limit(struct regulator *regulator) 2077414c70cbSLiam Girdwood { 2078414c70cbSLiam Girdwood return _regulator_get_current_limit(regulator->rdev); 2079414c70cbSLiam Girdwood } 2080414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_current_limit); 2081414c70cbSLiam Girdwood 2082414c70cbSLiam Girdwood /** 2083414c70cbSLiam Girdwood * regulator_set_mode - set regulator operating mode 2084414c70cbSLiam Girdwood * @regulator: regulator source 2085414c70cbSLiam Girdwood * @mode: operating mode - one of the REGULATOR_MODE constants 2086414c70cbSLiam Girdwood * 2087414c70cbSLiam Girdwood * Set regulator operating mode to increase regulator efficiency or improve 2088414c70cbSLiam Girdwood * regulation performance. 2089414c70cbSLiam Girdwood * 2090414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 2091414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 2092414c70cbSLiam Girdwood */ 2093414c70cbSLiam Girdwood int regulator_set_mode(struct regulator *regulator, unsigned int mode) 2094414c70cbSLiam Girdwood { 2095414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2096414c70cbSLiam Girdwood int ret; 2097500b4ac9SSundar R Iyer int regulator_curr_mode; 2098414c70cbSLiam Girdwood 2099414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2100414c70cbSLiam Girdwood 2101414c70cbSLiam Girdwood /* sanity check */ 2102414c70cbSLiam Girdwood if (!rdev->desc->ops->set_mode) { 2103414c70cbSLiam Girdwood ret = -EINVAL; 2104414c70cbSLiam Girdwood goto out; 2105414c70cbSLiam Girdwood } 2106414c70cbSLiam Girdwood 2107500b4ac9SSundar R Iyer /* return if the same mode is requested */ 2108500b4ac9SSundar R Iyer if (rdev->desc->ops->get_mode) { 2109500b4ac9SSundar R Iyer regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 2110500b4ac9SSundar R Iyer if (regulator_curr_mode == mode) { 2111500b4ac9SSundar R Iyer ret = 0; 2112500b4ac9SSundar R Iyer goto out; 2113500b4ac9SSundar R Iyer } 2114500b4ac9SSundar R Iyer } 2115500b4ac9SSundar R Iyer 2116414c70cbSLiam Girdwood /* constraints check */ 211722c51b47SAxel Lin ret = regulator_mode_constrain(rdev, &mode); 2118414c70cbSLiam Girdwood if (ret < 0) 2119414c70cbSLiam Girdwood goto out; 2120414c70cbSLiam Girdwood 2121414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 2122414c70cbSLiam Girdwood out: 2123414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2124414c70cbSLiam Girdwood return ret; 2125414c70cbSLiam Girdwood } 2126414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_mode); 2127414c70cbSLiam Girdwood 2128414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 2129414c70cbSLiam Girdwood { 2130414c70cbSLiam Girdwood int ret; 2131414c70cbSLiam Girdwood 2132414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2133414c70cbSLiam Girdwood 2134414c70cbSLiam Girdwood /* sanity check */ 2135414c70cbSLiam Girdwood if (!rdev->desc->ops->get_mode) { 2136414c70cbSLiam Girdwood ret = -EINVAL; 2137414c70cbSLiam Girdwood goto out; 2138414c70cbSLiam Girdwood } 2139414c70cbSLiam Girdwood 2140414c70cbSLiam Girdwood ret = rdev->desc->ops->get_mode(rdev); 2141414c70cbSLiam Girdwood out: 2142414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2143414c70cbSLiam Girdwood return ret; 2144414c70cbSLiam Girdwood } 2145414c70cbSLiam Girdwood 2146414c70cbSLiam Girdwood /** 2147414c70cbSLiam Girdwood * regulator_get_mode - get regulator operating mode 2148414c70cbSLiam Girdwood * @regulator: regulator source 2149414c70cbSLiam Girdwood * 2150414c70cbSLiam Girdwood * Get the current regulator operating mode. 2151414c70cbSLiam Girdwood */ 2152414c70cbSLiam Girdwood unsigned int regulator_get_mode(struct regulator *regulator) 2153414c70cbSLiam Girdwood { 2154414c70cbSLiam Girdwood return _regulator_get_mode(regulator->rdev); 2155414c70cbSLiam Girdwood } 2156414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_mode); 2157414c70cbSLiam Girdwood 2158414c70cbSLiam Girdwood /** 2159414c70cbSLiam Girdwood * regulator_set_optimum_mode - set regulator optimum operating mode 2160414c70cbSLiam Girdwood * @regulator: regulator source 2161414c70cbSLiam Girdwood * @uA_load: load current 2162414c70cbSLiam Girdwood * 2163414c70cbSLiam Girdwood * Notifies the regulator core of a new device load. This is then used by 2164414c70cbSLiam Girdwood * DRMS (if enabled by constraints) to set the most efficient regulator 2165414c70cbSLiam Girdwood * operating mode for the new regulator loading. 2166414c70cbSLiam Girdwood * 2167414c70cbSLiam Girdwood * Consumer devices notify their supply regulator of the maximum power 2168414c70cbSLiam Girdwood * they will require (can be taken from device datasheet in the power 2169414c70cbSLiam Girdwood * consumption tables) when they change operational status and hence power 2170414c70cbSLiam Girdwood * state. Examples of operational state changes that can affect power 2171414c70cbSLiam Girdwood * consumption are :- 2172414c70cbSLiam Girdwood * 2173414c70cbSLiam Girdwood * o Device is opened / closed. 2174414c70cbSLiam Girdwood * o Device I/O is about to begin or has just finished. 2175414c70cbSLiam Girdwood * o Device is idling in between work. 2176414c70cbSLiam Girdwood * 2177414c70cbSLiam Girdwood * This information is also exported via sysfs to userspace. 2178414c70cbSLiam Girdwood * 2179414c70cbSLiam Girdwood * DRMS will sum the total requested load on the regulator and change 2180414c70cbSLiam Girdwood * to the most efficient operating mode if platform constraints allow. 2181414c70cbSLiam Girdwood * 2182414c70cbSLiam Girdwood * Returns the new regulator mode or error. 2183414c70cbSLiam Girdwood */ 2184414c70cbSLiam Girdwood int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 2185414c70cbSLiam Girdwood { 2186414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 2187414c70cbSLiam Girdwood struct regulator *consumer; 2188414c70cbSLiam Girdwood int ret, output_uV, input_uV, total_uA_load = 0; 2189414c70cbSLiam Girdwood unsigned int mode; 2190414c70cbSLiam Girdwood 2191414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2192414c70cbSLiam Girdwood 2193a4b41483SMark Brown /* 2194a4b41483SMark Brown * first check to see if we can set modes at all, otherwise just 2195a4b41483SMark Brown * tell the consumer everything is OK. 2196a4b41483SMark Brown */ 2197414c70cbSLiam Girdwood regulator->uA_load = uA_load; 2198414c70cbSLiam Girdwood ret = regulator_check_drms(rdev); 2199a4b41483SMark Brown if (ret < 0) { 2200a4b41483SMark Brown ret = 0; 2201414c70cbSLiam Girdwood goto out; 2202a4b41483SMark Brown } 2203414c70cbSLiam Girdwood 2204414c70cbSLiam Girdwood if (!rdev->desc->ops->get_optimum_mode) 2205414c70cbSLiam Girdwood goto out; 2206414c70cbSLiam Girdwood 2207a4b41483SMark Brown /* 2208a4b41483SMark Brown * we can actually do this so any errors are indicators of 2209a4b41483SMark Brown * potential real failure. 2210a4b41483SMark Brown */ 2211a4b41483SMark Brown ret = -EINVAL; 2212a4b41483SMark Brown 2213414c70cbSLiam Girdwood /* get output voltage */ 22141bf5a1f8SMark Brown output_uV = _regulator_get_voltage(rdev); 2215414c70cbSLiam Girdwood if (output_uV <= 0) { 22165da84fd9SJoe Perches rdev_err(rdev, "invalid output voltage found\n"); 2217414c70cbSLiam Girdwood goto out; 2218414c70cbSLiam Girdwood } 2219414c70cbSLiam Girdwood 2220414c70cbSLiam Girdwood /* get input voltage */ 22211bf5a1f8SMark Brown input_uV = 0; 22221bf5a1f8SMark Brown if (rdev->supply) 22233801b86aSMark Brown input_uV = regulator_get_voltage(rdev->supply); 22241bf5a1f8SMark Brown if (input_uV <= 0) 2225414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 2226414c70cbSLiam Girdwood if (input_uV <= 0) { 22275da84fd9SJoe Perches rdev_err(rdev, "invalid input voltage found\n"); 2228414c70cbSLiam Girdwood goto out; 2229414c70cbSLiam Girdwood } 2230414c70cbSLiam Girdwood 2231414c70cbSLiam Girdwood /* calc total requested load for this regulator */ 2232414c70cbSLiam Girdwood list_for_each_entry(consumer, &rdev->consumer_list, list) 2233414c70cbSLiam Girdwood total_uA_load += consumer->uA_load; 2234414c70cbSLiam Girdwood 2235414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, 2236414c70cbSLiam Girdwood input_uV, output_uV, 2237414c70cbSLiam Girdwood total_uA_load); 22382c608234SMark Brown ret = regulator_mode_constrain(rdev, &mode); 2239e573520bSDavid Brownell if (ret < 0) { 22405da84fd9SJoe Perches rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n", 2241414c70cbSLiam Girdwood total_uA_load, input_uV, output_uV); 2242414c70cbSLiam Girdwood goto out; 2243414c70cbSLiam Girdwood } 2244414c70cbSLiam Girdwood 2245414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 2246e573520bSDavid Brownell if (ret < 0) { 22475da84fd9SJoe Perches rdev_err(rdev, "failed to set optimum mode %x\n", mode); 2248414c70cbSLiam Girdwood goto out; 2249414c70cbSLiam Girdwood } 2250414c70cbSLiam Girdwood ret = mode; 2251414c70cbSLiam Girdwood out: 2252414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2253414c70cbSLiam Girdwood return ret; 2254414c70cbSLiam Girdwood } 2255414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 2256414c70cbSLiam Girdwood 2257414c70cbSLiam Girdwood /** 2258414c70cbSLiam Girdwood * regulator_register_notifier - register regulator event notifier 2259414c70cbSLiam Girdwood * @regulator: regulator source 226069279fb9SMark Brown * @nb: notifier block 2261414c70cbSLiam Girdwood * 2262414c70cbSLiam Girdwood * Register notifier block to receive regulator events. 2263414c70cbSLiam Girdwood */ 2264414c70cbSLiam Girdwood int regulator_register_notifier(struct regulator *regulator, 2265414c70cbSLiam Girdwood struct notifier_block *nb) 2266414c70cbSLiam Girdwood { 2267414c70cbSLiam Girdwood return blocking_notifier_chain_register(®ulator->rdev->notifier, 2268414c70cbSLiam Girdwood nb); 2269414c70cbSLiam Girdwood } 2270414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register_notifier); 2271414c70cbSLiam Girdwood 2272414c70cbSLiam Girdwood /** 2273414c70cbSLiam Girdwood * regulator_unregister_notifier - unregister regulator event notifier 2274414c70cbSLiam Girdwood * @regulator: regulator source 227569279fb9SMark Brown * @nb: notifier block 2276414c70cbSLiam Girdwood * 2277414c70cbSLiam Girdwood * Unregister regulator event notifier block. 2278414c70cbSLiam Girdwood */ 2279414c70cbSLiam Girdwood int regulator_unregister_notifier(struct regulator *regulator, 2280414c70cbSLiam Girdwood struct notifier_block *nb) 2281414c70cbSLiam Girdwood { 2282414c70cbSLiam Girdwood return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 2283414c70cbSLiam Girdwood nb); 2284414c70cbSLiam Girdwood } 2285414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 2286414c70cbSLiam Girdwood 2287b136fb44SJonathan Cameron /* notify regulator consumers and downstream regulator consumers. 2288b136fb44SJonathan Cameron * Note mutex must be held by caller. 2289b136fb44SJonathan Cameron */ 2290414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 2291414c70cbSLiam Girdwood unsigned long event, void *data) 2292414c70cbSLiam Girdwood { 2293414c70cbSLiam Girdwood /* call rdev chain first */ 2294414c70cbSLiam Girdwood blocking_notifier_call_chain(&rdev->notifier, event, NULL); 2295414c70cbSLiam Girdwood } 2296414c70cbSLiam Girdwood 2297414c70cbSLiam Girdwood /** 2298414c70cbSLiam Girdwood * regulator_bulk_get - get multiple regulator consumers 2299414c70cbSLiam Girdwood * 2300414c70cbSLiam Girdwood * @dev: Device to supply 2301414c70cbSLiam Girdwood * @num_consumers: Number of consumers to register 2302414c70cbSLiam Girdwood * @consumers: Configuration of consumers; clients are stored here. 2303414c70cbSLiam Girdwood * 2304414c70cbSLiam Girdwood * @return 0 on success, an errno on failure. 2305414c70cbSLiam Girdwood * 2306414c70cbSLiam Girdwood * This helper function allows drivers to get several regulator 2307414c70cbSLiam Girdwood * consumers in one operation. If any of the regulators cannot be 2308414c70cbSLiam Girdwood * acquired then any regulators that were allocated will be freed 2309414c70cbSLiam Girdwood * before returning to the caller. 2310414c70cbSLiam Girdwood */ 2311414c70cbSLiam Girdwood int regulator_bulk_get(struct device *dev, int num_consumers, 2312414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2313414c70cbSLiam Girdwood { 2314414c70cbSLiam Girdwood int i; 2315414c70cbSLiam Girdwood int ret; 2316414c70cbSLiam Girdwood 2317414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) 2318414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2319414c70cbSLiam Girdwood 2320414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2321414c70cbSLiam Girdwood consumers[i].consumer = regulator_get(dev, 2322414c70cbSLiam Girdwood consumers[i].supply); 2323414c70cbSLiam Girdwood if (IS_ERR(consumers[i].consumer)) { 2324414c70cbSLiam Girdwood ret = PTR_ERR(consumers[i].consumer); 23255b307627SMark Brown dev_err(dev, "Failed to get supply '%s': %d\n", 23265b307627SMark Brown consumers[i].supply, ret); 2327414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2328414c70cbSLiam Girdwood goto err; 2329414c70cbSLiam Girdwood } 2330414c70cbSLiam Girdwood } 2331414c70cbSLiam Girdwood 2332414c70cbSLiam Girdwood return 0; 2333414c70cbSLiam Girdwood 2334414c70cbSLiam Girdwood err: 2335414c70cbSLiam Girdwood for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2336414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2337414c70cbSLiam Girdwood 2338414c70cbSLiam Girdwood return ret; 2339414c70cbSLiam Girdwood } 2340414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_get); 2341414c70cbSLiam Girdwood 2342f21e0e81SMark Brown static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) 2343f21e0e81SMark Brown { 2344f21e0e81SMark Brown struct regulator_bulk_data *bulk = data; 2345f21e0e81SMark Brown 2346f21e0e81SMark Brown bulk->ret = regulator_enable(bulk->consumer); 2347f21e0e81SMark Brown } 2348f21e0e81SMark Brown 2349414c70cbSLiam Girdwood /** 2350414c70cbSLiam Girdwood * regulator_bulk_enable - enable multiple regulator consumers 2351414c70cbSLiam Girdwood * 2352414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2353414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2354414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2355414c70cbSLiam Girdwood * 2356414c70cbSLiam Girdwood * This convenience API allows consumers to enable multiple regulator 2357414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2358414c70cbSLiam Girdwood * then any others that were enabled will be disabled again prior to 2359414c70cbSLiam Girdwood * return. 2360414c70cbSLiam Girdwood */ 2361414c70cbSLiam Girdwood int regulator_bulk_enable(int num_consumers, 2362414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2363414c70cbSLiam Girdwood { 2364f21e0e81SMark Brown LIST_HEAD(async_domain); 2365414c70cbSLiam Girdwood int i; 2366f21e0e81SMark Brown int ret = 0; 2367414c70cbSLiam Girdwood 2368f21e0e81SMark Brown for (i = 0; i < num_consumers; i++) 2369f21e0e81SMark Brown async_schedule_domain(regulator_bulk_enable_async, 2370f21e0e81SMark Brown &consumers[i], &async_domain); 2371f21e0e81SMark Brown 2372f21e0e81SMark Brown async_synchronize_full_domain(&async_domain); 2373f21e0e81SMark Brown 2374f21e0e81SMark Brown /* If any consumer failed we need to unwind any that succeeded */ 2375414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2376f21e0e81SMark Brown if (consumers[i].ret != 0) { 2377f21e0e81SMark Brown ret = consumers[i].ret; 2378414c70cbSLiam Girdwood goto err; 2379414c70cbSLiam Girdwood } 2380f21e0e81SMark Brown } 2381414c70cbSLiam Girdwood 2382414c70cbSLiam Girdwood return 0; 2383414c70cbSLiam Girdwood 2384414c70cbSLiam Girdwood err: 2385f21e0e81SMark Brown for (i = 0; i < num_consumers; i++) 2386f21e0e81SMark Brown if (consumers[i].ret == 0) 2387414c70cbSLiam Girdwood regulator_disable(consumers[i].consumer); 2388f21e0e81SMark Brown else 2389f21e0e81SMark Brown pr_err("Failed to enable %s: %d\n", 2390f21e0e81SMark Brown consumers[i].supply, consumers[i].ret); 2391414c70cbSLiam Girdwood 2392414c70cbSLiam Girdwood return ret; 2393414c70cbSLiam Girdwood } 2394414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2395414c70cbSLiam Girdwood 2396414c70cbSLiam Girdwood /** 2397414c70cbSLiam Girdwood * regulator_bulk_disable - disable multiple regulator consumers 2398414c70cbSLiam Girdwood * 2399414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2400414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2401414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2402414c70cbSLiam Girdwood * 2403414c70cbSLiam Girdwood * This convenience API allows consumers to disable multiple regulator 2404414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2405414c70cbSLiam Girdwood * then any others that were disabled will be disabled again prior to 2406414c70cbSLiam Girdwood * return. 2407414c70cbSLiam Girdwood */ 2408414c70cbSLiam Girdwood int regulator_bulk_disable(int num_consumers, 2409414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2410414c70cbSLiam Girdwood { 2411414c70cbSLiam Girdwood int i; 2412414c70cbSLiam Girdwood int ret; 2413414c70cbSLiam Girdwood 2414414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2415414c70cbSLiam Girdwood ret = regulator_disable(consumers[i].consumer); 2416414c70cbSLiam Girdwood if (ret != 0) 2417414c70cbSLiam Girdwood goto err; 2418414c70cbSLiam Girdwood } 2419414c70cbSLiam Girdwood 2420414c70cbSLiam Girdwood return 0; 2421414c70cbSLiam Girdwood 2422414c70cbSLiam Girdwood err: 24235da84fd9SJoe Perches pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret); 2424eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2425414c70cbSLiam Girdwood regulator_enable(consumers[i].consumer); 2426414c70cbSLiam Girdwood 2427414c70cbSLiam Girdwood return ret; 2428414c70cbSLiam Girdwood } 2429414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2430414c70cbSLiam Girdwood 2431414c70cbSLiam Girdwood /** 2432414c70cbSLiam Girdwood * regulator_bulk_free - free multiple regulator consumers 2433414c70cbSLiam Girdwood * 2434414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2435414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2436414c70cbSLiam Girdwood * 2437414c70cbSLiam Girdwood * This convenience API allows consumers to free multiple regulator 2438414c70cbSLiam Girdwood * clients in a single API call. 2439414c70cbSLiam Girdwood */ 2440414c70cbSLiam Girdwood void regulator_bulk_free(int num_consumers, 2441414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2442414c70cbSLiam Girdwood { 2443414c70cbSLiam Girdwood int i; 2444414c70cbSLiam Girdwood 2445414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2446414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2447414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2448414c70cbSLiam Girdwood } 2449414c70cbSLiam Girdwood } 2450414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_free); 2451414c70cbSLiam Girdwood 2452414c70cbSLiam Girdwood /** 2453414c70cbSLiam Girdwood * regulator_notifier_call_chain - call regulator event notifier 245469279fb9SMark Brown * @rdev: regulator source 2455414c70cbSLiam Girdwood * @event: notifier block 245669279fb9SMark Brown * @data: callback-specific data. 2457414c70cbSLiam Girdwood * 2458414c70cbSLiam Girdwood * Called by regulator drivers to notify clients a regulator event has 2459414c70cbSLiam Girdwood * occurred. We also notify regulator clients downstream. 2460b136fb44SJonathan Cameron * Note lock must be held by caller. 2461414c70cbSLiam Girdwood */ 2462414c70cbSLiam Girdwood int regulator_notifier_call_chain(struct regulator_dev *rdev, 2463414c70cbSLiam Girdwood unsigned long event, void *data) 2464414c70cbSLiam Girdwood { 2465414c70cbSLiam Girdwood _notifier_call_chain(rdev, event, data); 2466414c70cbSLiam Girdwood return NOTIFY_DONE; 2467414c70cbSLiam Girdwood 2468414c70cbSLiam Girdwood } 2469414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2470414c70cbSLiam Girdwood 2471be721979SMark Brown /** 2472be721979SMark Brown * regulator_mode_to_status - convert a regulator mode into a status 2473be721979SMark Brown * 2474be721979SMark Brown * @mode: Mode to convert 2475be721979SMark Brown * 2476be721979SMark Brown * Convert a regulator mode into a status. 2477be721979SMark Brown */ 2478be721979SMark Brown int regulator_mode_to_status(unsigned int mode) 2479be721979SMark Brown { 2480be721979SMark Brown switch (mode) { 2481be721979SMark Brown case REGULATOR_MODE_FAST: 2482be721979SMark Brown return REGULATOR_STATUS_FAST; 2483be721979SMark Brown case REGULATOR_MODE_NORMAL: 2484be721979SMark Brown return REGULATOR_STATUS_NORMAL; 2485be721979SMark Brown case REGULATOR_MODE_IDLE: 2486be721979SMark Brown return REGULATOR_STATUS_IDLE; 2487be721979SMark Brown case REGULATOR_STATUS_STANDBY: 2488be721979SMark Brown return REGULATOR_STATUS_STANDBY; 2489be721979SMark Brown default: 2490be721979SMark Brown return 0; 2491be721979SMark Brown } 2492be721979SMark Brown } 2493be721979SMark Brown EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2494be721979SMark Brown 24957ad68e2fSDavid Brownell /* 24967ad68e2fSDavid Brownell * To avoid cluttering sysfs (and memory) with useless state, only 24977ad68e2fSDavid Brownell * create attributes that can be meaningfully displayed. 24987ad68e2fSDavid Brownell */ 24997ad68e2fSDavid Brownell static int add_regulator_attributes(struct regulator_dev *rdev) 25007ad68e2fSDavid Brownell { 25017ad68e2fSDavid Brownell struct device *dev = &rdev->dev; 25027ad68e2fSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 25037ad68e2fSDavid Brownell int status = 0; 25047ad68e2fSDavid Brownell 25057ad68e2fSDavid Brownell /* some attributes need specific methods to be displayed */ 2506476c2d83SMark Brown if (ops->get_voltage || ops->get_voltage_sel) { 25077ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microvolts); 25087ad68e2fSDavid Brownell if (status < 0) 25097ad68e2fSDavid Brownell return status; 25107ad68e2fSDavid Brownell } 25117ad68e2fSDavid Brownell if (ops->get_current_limit) { 25127ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microamps); 25137ad68e2fSDavid Brownell if (status < 0) 25147ad68e2fSDavid Brownell return status; 25157ad68e2fSDavid Brownell } 25167ad68e2fSDavid Brownell if (ops->get_mode) { 25177ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_opmode); 25187ad68e2fSDavid Brownell if (status < 0) 25197ad68e2fSDavid Brownell return status; 25207ad68e2fSDavid Brownell } 25217ad68e2fSDavid Brownell if (ops->is_enabled) { 25227ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_state); 25237ad68e2fSDavid Brownell if (status < 0) 25247ad68e2fSDavid Brownell return status; 25257ad68e2fSDavid Brownell } 2526853116a1SDavid Brownell if (ops->get_status) { 2527853116a1SDavid Brownell status = device_create_file(dev, &dev_attr_status); 2528853116a1SDavid Brownell if (status < 0) 2529853116a1SDavid Brownell return status; 2530853116a1SDavid Brownell } 25317ad68e2fSDavid Brownell 25327ad68e2fSDavid Brownell /* some attributes are type-specific */ 25337ad68e2fSDavid Brownell if (rdev->desc->type == REGULATOR_CURRENT) { 25347ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_requested_microamps); 25357ad68e2fSDavid Brownell if (status < 0) 25367ad68e2fSDavid Brownell return status; 25377ad68e2fSDavid Brownell } 25387ad68e2fSDavid Brownell 25397ad68e2fSDavid Brownell /* all the other attributes exist to support constraints; 25407ad68e2fSDavid Brownell * don't show them if there are no constraints, or if the 25417ad68e2fSDavid Brownell * relevant supporting methods are missing. 25427ad68e2fSDavid Brownell */ 25437ad68e2fSDavid Brownell if (!rdev->constraints) 25447ad68e2fSDavid Brownell return status; 25457ad68e2fSDavid Brownell 25467ad68e2fSDavid Brownell /* constraints need specific supporting methods */ 2547e8eef82bSMark Brown if (ops->set_voltage || ops->set_voltage_sel) { 25487ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microvolts); 25497ad68e2fSDavid Brownell if (status < 0) 25507ad68e2fSDavid Brownell return status; 25517ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microvolts); 25527ad68e2fSDavid Brownell if (status < 0) 25537ad68e2fSDavid Brownell return status; 25547ad68e2fSDavid Brownell } 25557ad68e2fSDavid Brownell if (ops->set_current_limit) { 25567ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microamps); 25577ad68e2fSDavid Brownell if (status < 0) 25587ad68e2fSDavid Brownell return status; 25597ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microamps); 25607ad68e2fSDavid Brownell if (status < 0) 25617ad68e2fSDavid Brownell return status; 25627ad68e2fSDavid Brownell } 25637ad68e2fSDavid Brownell 25647ad68e2fSDavid Brownell /* suspend mode constraints need multiple supporting methods */ 25657ad68e2fSDavid Brownell if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 25667ad68e2fSDavid Brownell return status; 25677ad68e2fSDavid Brownell 25687ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_standby_state); 25697ad68e2fSDavid Brownell if (status < 0) 25707ad68e2fSDavid Brownell return status; 25717ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_mem_state); 25727ad68e2fSDavid Brownell if (status < 0) 25737ad68e2fSDavid Brownell return status; 25747ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_disk_state); 25757ad68e2fSDavid Brownell if (status < 0) 25767ad68e2fSDavid Brownell return status; 25777ad68e2fSDavid Brownell 25787ad68e2fSDavid Brownell if (ops->set_suspend_voltage) { 25797ad68e2fSDavid Brownell status = device_create_file(dev, 25807ad68e2fSDavid Brownell &dev_attr_suspend_standby_microvolts); 25817ad68e2fSDavid Brownell if (status < 0) 25827ad68e2fSDavid Brownell return status; 25837ad68e2fSDavid Brownell status = device_create_file(dev, 25847ad68e2fSDavid Brownell &dev_attr_suspend_mem_microvolts); 25857ad68e2fSDavid Brownell if (status < 0) 25867ad68e2fSDavid Brownell return status; 25877ad68e2fSDavid Brownell status = device_create_file(dev, 25887ad68e2fSDavid Brownell &dev_attr_suspend_disk_microvolts); 25897ad68e2fSDavid Brownell if (status < 0) 25907ad68e2fSDavid Brownell return status; 25917ad68e2fSDavid Brownell } 25927ad68e2fSDavid Brownell 25937ad68e2fSDavid Brownell if (ops->set_suspend_mode) { 25947ad68e2fSDavid Brownell status = device_create_file(dev, 25957ad68e2fSDavid Brownell &dev_attr_suspend_standby_mode); 25967ad68e2fSDavid Brownell if (status < 0) 25977ad68e2fSDavid Brownell return status; 25987ad68e2fSDavid Brownell status = device_create_file(dev, 25997ad68e2fSDavid Brownell &dev_attr_suspend_mem_mode); 26007ad68e2fSDavid Brownell if (status < 0) 26017ad68e2fSDavid Brownell return status; 26027ad68e2fSDavid Brownell status = device_create_file(dev, 26037ad68e2fSDavid Brownell &dev_attr_suspend_disk_mode); 26047ad68e2fSDavid Brownell if (status < 0) 26057ad68e2fSDavid Brownell return status; 26067ad68e2fSDavid Brownell } 26077ad68e2fSDavid Brownell 26087ad68e2fSDavid Brownell return status; 26097ad68e2fSDavid Brownell } 26107ad68e2fSDavid Brownell 26111130e5b3SMark Brown static void rdev_init_debugfs(struct regulator_dev *rdev) 26121130e5b3SMark Brown { 26131130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 26141130e5b3SMark Brown rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root); 26151130e5b3SMark Brown if (IS_ERR(rdev->debugfs) || !rdev->debugfs) { 26161130e5b3SMark Brown rdev_warn(rdev, "Failed to create debugfs directory\n"); 26171130e5b3SMark Brown rdev->debugfs = NULL; 26181130e5b3SMark Brown return; 26191130e5b3SMark Brown } 26201130e5b3SMark Brown 26211130e5b3SMark Brown debugfs_create_u32("use_count", 0444, rdev->debugfs, 26221130e5b3SMark Brown &rdev->use_count); 26231130e5b3SMark Brown debugfs_create_u32("open_count", 0444, rdev->debugfs, 26241130e5b3SMark Brown &rdev->open_count); 26251130e5b3SMark Brown #endif 26261130e5b3SMark Brown } 26271130e5b3SMark Brown 2628414c70cbSLiam Girdwood /** 2629414c70cbSLiam Girdwood * regulator_register - register regulator 263069279fb9SMark Brown * @regulator_desc: regulator to register 263169279fb9SMark Brown * @dev: struct device for the regulator 26320527100fSMark Brown * @init_data: platform provided init data, passed through by driver 263369279fb9SMark Brown * @driver_data: private regulator data 2634414c70cbSLiam Girdwood * 2635414c70cbSLiam Girdwood * Called by regulator drivers to register a regulator. 2636414c70cbSLiam Girdwood * Returns 0 on success. 2637414c70cbSLiam Girdwood */ 2638414c70cbSLiam Girdwood struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 2639f8c12fe3SMark Brown struct device *dev, const struct regulator_init_data *init_data, 26402c043bcbSRajendra Nayak void *driver_data, struct device_node *of_node) 2641414c70cbSLiam Girdwood { 2642414c70cbSLiam Girdwood static atomic_t regulator_no = ATOMIC_INIT(0); 2643414c70cbSLiam Girdwood struct regulator_dev *rdev; 2644a5766f11SLiam Girdwood int ret, i; 2645414c70cbSLiam Girdwood 2646414c70cbSLiam Girdwood if (regulator_desc == NULL) 2647414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2648414c70cbSLiam Girdwood 2649414c70cbSLiam Girdwood if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2650414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2651414c70cbSLiam Girdwood 2652cd78dfc6SDiego Liziero if (regulator_desc->type != REGULATOR_VOLTAGE && 2653cd78dfc6SDiego Liziero regulator_desc->type != REGULATOR_CURRENT) 2654414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2655414c70cbSLiam Girdwood 265646fabe1eSMark Brown if (!init_data) 265746fabe1eSMark Brown return ERR_PTR(-EINVAL); 265846fabe1eSMark Brown 2659476c2d83SMark Brown /* Only one of each should be implemented */ 2660476c2d83SMark Brown WARN_ON(regulator_desc->ops->get_voltage && 2661476c2d83SMark Brown regulator_desc->ops->get_voltage_sel); 2662e8eef82bSMark Brown WARN_ON(regulator_desc->ops->set_voltage && 2663e8eef82bSMark Brown regulator_desc->ops->set_voltage_sel); 2664476c2d83SMark Brown 2665476c2d83SMark Brown /* If we're using selectors we must implement list_voltage. */ 2666476c2d83SMark Brown if (regulator_desc->ops->get_voltage_sel && 2667476c2d83SMark Brown !regulator_desc->ops->list_voltage) { 2668476c2d83SMark Brown return ERR_PTR(-EINVAL); 2669476c2d83SMark Brown } 2670e8eef82bSMark Brown if (regulator_desc->ops->set_voltage_sel && 2671e8eef82bSMark Brown !regulator_desc->ops->list_voltage) { 2672e8eef82bSMark Brown return ERR_PTR(-EINVAL); 2673e8eef82bSMark Brown } 2674476c2d83SMark Brown 2675414c70cbSLiam Girdwood rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2676414c70cbSLiam Girdwood if (rdev == NULL) 2677414c70cbSLiam Girdwood return ERR_PTR(-ENOMEM); 2678414c70cbSLiam Girdwood 2679414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2680414c70cbSLiam Girdwood 2681414c70cbSLiam Girdwood mutex_init(&rdev->mutex); 2682a5766f11SLiam Girdwood rdev->reg_data = driver_data; 2683414c70cbSLiam Girdwood rdev->owner = regulator_desc->owner; 2684414c70cbSLiam Girdwood rdev->desc = regulator_desc; 2685414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->consumer_list); 2686414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->list); 2687414c70cbSLiam Girdwood BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2688da07ecd9SMark Brown INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); 2689414c70cbSLiam Girdwood 2690a5766f11SLiam Girdwood /* preform any regulator specific init */ 2691a5766f11SLiam Girdwood if (init_data->regulator_init) { 2692a5766f11SLiam Girdwood ret = init_data->regulator_init(rdev->reg_data); 26934fca9545SDavid Brownell if (ret < 0) 26944fca9545SDavid Brownell goto clean; 2695a5766f11SLiam Girdwood } 2696a5766f11SLiam Girdwood 2697a5766f11SLiam Girdwood /* register with sysfs */ 2698a5766f11SLiam Girdwood rdev->dev.class = ®ulator_class; 26992c043bcbSRajendra Nayak rdev->dev.of_node = of_node; 2700a5766f11SLiam Girdwood rdev->dev.parent = dev; 2701812460a9SKay Sievers dev_set_name(&rdev->dev, "regulator.%d", 2702812460a9SKay Sievers atomic_inc_return(®ulator_no) - 1); 2703a5766f11SLiam Girdwood ret = device_register(&rdev->dev); 2704ad7725cbSVasiliy Kulikov if (ret != 0) { 2705ad7725cbSVasiliy Kulikov put_device(&rdev->dev); 27064fca9545SDavid Brownell goto clean; 2707ad7725cbSVasiliy Kulikov } 2708a5766f11SLiam Girdwood 2709a5766f11SLiam Girdwood dev_set_drvdata(&rdev->dev, rdev); 2710a5766f11SLiam Girdwood 271174f544c1SMike Rapoport /* set regulator constraints */ 271274f544c1SMike Rapoport ret = set_machine_constraints(rdev, &init_data->constraints); 271374f544c1SMike Rapoport if (ret < 0) 271474f544c1SMike Rapoport goto scrub; 271574f544c1SMike Rapoport 27167ad68e2fSDavid Brownell /* add attributes supported by this regulator */ 27177ad68e2fSDavid Brownell ret = add_regulator_attributes(rdev); 27187ad68e2fSDavid Brownell if (ret < 0) 27197ad68e2fSDavid Brownell goto scrub; 27207ad68e2fSDavid Brownell 27210178f3e2SMark Brown if (init_data->supply_regulator) { 27220178f3e2SMark Brown struct regulator_dev *r; 27230178f3e2SMark Brown int found = 0; 27240178f3e2SMark Brown 27250178f3e2SMark Brown list_for_each_entry(r, ®ulator_list, list) { 27260178f3e2SMark Brown if (strcmp(rdev_get_name(r), 27270178f3e2SMark Brown init_data->supply_regulator) == 0) { 27280178f3e2SMark Brown found = 1; 27290178f3e2SMark Brown break; 27300178f3e2SMark Brown } 27310178f3e2SMark Brown } 27320178f3e2SMark Brown 27330178f3e2SMark Brown if (!found) { 27340178f3e2SMark Brown dev_err(dev, "Failed to find supply %s\n", 27350178f3e2SMark Brown init_data->supply_regulator); 27367727da22SAxel Lin ret = -ENODEV; 27370178f3e2SMark Brown goto scrub; 27380178f3e2SMark Brown } 27390178f3e2SMark Brown 27400178f3e2SMark Brown ret = set_supply(rdev, r); 27410178f3e2SMark Brown if (ret < 0) 27420178f3e2SMark Brown goto scrub; 27430178f3e2SMark Brown } 27440178f3e2SMark Brown 2745a5766f11SLiam Girdwood /* add consumers devices */ 2746a5766f11SLiam Girdwood for (i = 0; i < init_data->num_consumer_supplies; i++) { 2747a5766f11SLiam Girdwood ret = set_consumer_device_supply(rdev, 2748a5766f11SLiam Girdwood init_data->consumer_supplies[i].dev, 274940f9244fSMark Brown init_data->consumer_supplies[i].dev_name, 2750a5766f11SLiam Girdwood init_data->consumer_supplies[i].supply); 275123c2f041SMark Brown if (ret < 0) { 275223c2f041SMark Brown dev_err(dev, "Failed to set supply %s\n", 275323c2f041SMark Brown init_data->consumer_supplies[i].supply); 2754d4033b54SJani Nikula goto unset_supplies; 2755a5766f11SLiam Girdwood } 275623c2f041SMark Brown } 2757a5766f11SLiam Girdwood 2758a5766f11SLiam Girdwood list_add(&rdev->list, ®ulator_list); 27591130e5b3SMark Brown 27601130e5b3SMark Brown rdev_init_debugfs(rdev); 2761a5766f11SLiam Girdwood out: 2762414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2763414c70cbSLiam Girdwood return rdev; 27644fca9545SDavid Brownell 2765d4033b54SJani Nikula unset_supplies: 2766d4033b54SJani Nikula unset_regulator_supplies(rdev); 2767d4033b54SJani Nikula 27684fca9545SDavid Brownell scrub: 27691a6958e7SAxel Lin kfree(rdev->constraints); 27704fca9545SDavid Brownell device_unregister(&rdev->dev); 277153032dafSPaul Walmsley /* device core frees rdev */ 277253032dafSPaul Walmsley rdev = ERR_PTR(ret); 277353032dafSPaul Walmsley goto out; 277453032dafSPaul Walmsley 27754fca9545SDavid Brownell clean: 27764fca9545SDavid Brownell kfree(rdev); 27774fca9545SDavid Brownell rdev = ERR_PTR(ret); 27784fca9545SDavid Brownell goto out; 2779414c70cbSLiam Girdwood } 2780414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register); 2781414c70cbSLiam Girdwood 2782414c70cbSLiam Girdwood /** 2783414c70cbSLiam Girdwood * regulator_unregister - unregister regulator 278469279fb9SMark Brown * @rdev: regulator to unregister 2785414c70cbSLiam Girdwood * 2786414c70cbSLiam Girdwood * Called by regulator drivers to unregister a regulator. 2787414c70cbSLiam Girdwood */ 2788414c70cbSLiam Girdwood void regulator_unregister(struct regulator_dev *rdev) 2789414c70cbSLiam Girdwood { 2790414c70cbSLiam Girdwood if (rdev == NULL) 2791414c70cbSLiam Girdwood return; 2792414c70cbSLiam Girdwood 2793414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 27941130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 27951130e5b3SMark Brown debugfs_remove_recursive(rdev->debugfs); 27961130e5b3SMark Brown #endif 2797da07ecd9SMark Brown flush_work_sync(&rdev->disable_work.work); 27986bf87d17SMark Brown WARN_ON(rdev->open_count); 27990f1d747bSMike Rapoport unset_regulator_supplies(rdev); 2800414c70cbSLiam Girdwood list_del(&rdev->list); 2801414c70cbSLiam Girdwood if (rdev->supply) 28023801b86aSMark Brown regulator_put(rdev->supply); 2803414c70cbSLiam Girdwood device_unregister(&rdev->dev); 2804f8c12fe3SMark Brown kfree(rdev->constraints); 2805414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2806414c70cbSLiam Girdwood } 2807414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister); 2808414c70cbSLiam Girdwood 2809414c70cbSLiam Girdwood /** 2810cf7bbcdfSMark Brown * regulator_suspend_prepare - prepare regulators for system wide suspend 2811414c70cbSLiam Girdwood * @state: system suspend state 2812414c70cbSLiam Girdwood * 2813414c70cbSLiam Girdwood * Configure each regulator with it's suspend operating parameters for state. 2814414c70cbSLiam Girdwood * This will usually be called by machine suspend code prior to supending. 2815414c70cbSLiam Girdwood */ 2816414c70cbSLiam Girdwood int regulator_suspend_prepare(suspend_state_t state) 2817414c70cbSLiam Girdwood { 2818414c70cbSLiam Girdwood struct regulator_dev *rdev; 2819414c70cbSLiam Girdwood int ret = 0; 2820414c70cbSLiam Girdwood 2821414c70cbSLiam Girdwood /* ON is handled by regulator active state */ 2822414c70cbSLiam Girdwood if (state == PM_SUSPEND_ON) 2823414c70cbSLiam Girdwood return -EINVAL; 2824414c70cbSLiam Girdwood 2825414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2826414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 2827414c70cbSLiam Girdwood 2828414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2829414c70cbSLiam Girdwood ret = suspend_prepare(rdev, state); 2830414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2831414c70cbSLiam Girdwood 2832414c70cbSLiam Girdwood if (ret < 0) { 28335da84fd9SJoe Perches rdev_err(rdev, "failed to prepare\n"); 2834414c70cbSLiam Girdwood goto out; 2835414c70cbSLiam Girdwood } 2836414c70cbSLiam Girdwood } 2837414c70cbSLiam Girdwood out: 2838414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2839414c70cbSLiam Girdwood return ret; 2840414c70cbSLiam Girdwood } 2841414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2842414c70cbSLiam Girdwood 2843414c70cbSLiam Girdwood /** 28447a32b589SMyungJoo Ham * regulator_suspend_finish - resume regulators from system wide suspend 28457a32b589SMyungJoo Ham * 28467a32b589SMyungJoo Ham * Turn on regulators that might be turned off by regulator_suspend_prepare 28477a32b589SMyungJoo Ham * and that should be turned on according to the regulators properties. 28487a32b589SMyungJoo Ham */ 28497a32b589SMyungJoo Ham int regulator_suspend_finish(void) 28507a32b589SMyungJoo Ham { 28517a32b589SMyungJoo Ham struct regulator_dev *rdev; 28527a32b589SMyungJoo Ham int ret = 0, error; 28537a32b589SMyungJoo Ham 28547a32b589SMyungJoo Ham mutex_lock(®ulator_list_mutex); 28557a32b589SMyungJoo Ham list_for_each_entry(rdev, ®ulator_list, list) { 28567a32b589SMyungJoo Ham struct regulator_ops *ops = rdev->desc->ops; 28577a32b589SMyungJoo Ham 28587a32b589SMyungJoo Ham mutex_lock(&rdev->mutex); 28597a32b589SMyungJoo Ham if ((rdev->use_count > 0 || rdev->constraints->always_on) && 28607a32b589SMyungJoo Ham ops->enable) { 28617a32b589SMyungJoo Ham error = ops->enable(rdev); 28627a32b589SMyungJoo Ham if (error) 28637a32b589SMyungJoo Ham ret = error; 28647a32b589SMyungJoo Ham } else { 28657a32b589SMyungJoo Ham if (!has_full_constraints) 28667a32b589SMyungJoo Ham goto unlock; 28677a32b589SMyungJoo Ham if (!ops->disable) 28687a32b589SMyungJoo Ham goto unlock; 28697a32b589SMyungJoo Ham if (ops->is_enabled && !ops->is_enabled(rdev)) 28707a32b589SMyungJoo Ham goto unlock; 28717a32b589SMyungJoo Ham 28727a32b589SMyungJoo Ham error = ops->disable(rdev); 28737a32b589SMyungJoo Ham if (error) 28747a32b589SMyungJoo Ham ret = error; 28757a32b589SMyungJoo Ham } 28767a32b589SMyungJoo Ham unlock: 28777a32b589SMyungJoo Ham mutex_unlock(&rdev->mutex); 28787a32b589SMyungJoo Ham } 28797a32b589SMyungJoo Ham mutex_unlock(®ulator_list_mutex); 28807a32b589SMyungJoo Ham return ret; 28817a32b589SMyungJoo Ham } 28827a32b589SMyungJoo Ham EXPORT_SYMBOL_GPL(regulator_suspend_finish); 28837a32b589SMyungJoo Ham 28847a32b589SMyungJoo Ham /** 2885ca725561SMark Brown * regulator_has_full_constraints - the system has fully specified constraints 2886ca725561SMark Brown * 2887ca725561SMark Brown * Calling this function will cause the regulator API to disable all 2888ca725561SMark Brown * regulators which have a zero use count and don't have an always_on 2889ca725561SMark Brown * constraint in a late_initcall. 2890ca725561SMark Brown * 2891ca725561SMark Brown * The intention is that this will become the default behaviour in a 2892ca725561SMark Brown * future kernel release so users are encouraged to use this facility 2893ca725561SMark Brown * now. 2894ca725561SMark Brown */ 2895ca725561SMark Brown void regulator_has_full_constraints(void) 2896ca725561SMark Brown { 2897ca725561SMark Brown has_full_constraints = 1; 2898ca725561SMark Brown } 2899ca725561SMark Brown EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2900ca725561SMark Brown 2901ca725561SMark Brown /** 2902688fe99aSMark Brown * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2903688fe99aSMark Brown * 2904688fe99aSMark Brown * Calling this function will cause the regulator API to provide a 2905688fe99aSMark Brown * dummy regulator to consumers if no physical regulator is found, 2906688fe99aSMark Brown * allowing most consumers to proceed as though a regulator were 2907688fe99aSMark Brown * configured. This allows systems such as those with software 2908688fe99aSMark Brown * controllable regulators for the CPU core only to be brought up more 2909688fe99aSMark Brown * readily. 2910688fe99aSMark Brown */ 2911688fe99aSMark Brown void regulator_use_dummy_regulator(void) 2912688fe99aSMark Brown { 2913688fe99aSMark Brown board_wants_dummy_regulator = true; 2914688fe99aSMark Brown } 2915688fe99aSMark Brown EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2916688fe99aSMark Brown 2917688fe99aSMark Brown /** 2918414c70cbSLiam Girdwood * rdev_get_drvdata - get rdev regulator driver data 291969279fb9SMark Brown * @rdev: regulator 2920414c70cbSLiam Girdwood * 2921414c70cbSLiam Girdwood * Get rdev regulator driver private data. This call can be used in the 2922414c70cbSLiam Girdwood * regulator driver context. 2923414c70cbSLiam Girdwood */ 2924414c70cbSLiam Girdwood void *rdev_get_drvdata(struct regulator_dev *rdev) 2925414c70cbSLiam Girdwood { 2926414c70cbSLiam Girdwood return rdev->reg_data; 2927414c70cbSLiam Girdwood } 2928414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2929414c70cbSLiam Girdwood 2930414c70cbSLiam Girdwood /** 2931414c70cbSLiam Girdwood * regulator_get_drvdata - get regulator driver data 2932414c70cbSLiam Girdwood * @regulator: regulator 2933414c70cbSLiam Girdwood * 2934414c70cbSLiam Girdwood * Get regulator driver private data. This call can be used in the consumer 2935414c70cbSLiam Girdwood * driver context when non API regulator specific functions need to be called. 2936414c70cbSLiam Girdwood */ 2937414c70cbSLiam Girdwood void *regulator_get_drvdata(struct regulator *regulator) 2938414c70cbSLiam Girdwood { 2939414c70cbSLiam Girdwood return regulator->rdev->reg_data; 2940414c70cbSLiam Girdwood } 2941414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2942414c70cbSLiam Girdwood 2943414c70cbSLiam Girdwood /** 2944414c70cbSLiam Girdwood * regulator_set_drvdata - set regulator driver data 2945414c70cbSLiam Girdwood * @regulator: regulator 2946414c70cbSLiam Girdwood * @data: data 2947414c70cbSLiam Girdwood */ 2948414c70cbSLiam Girdwood void regulator_set_drvdata(struct regulator *regulator, void *data) 2949414c70cbSLiam Girdwood { 2950414c70cbSLiam Girdwood regulator->rdev->reg_data = data; 2951414c70cbSLiam Girdwood } 2952414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2953414c70cbSLiam Girdwood 2954414c70cbSLiam Girdwood /** 2955414c70cbSLiam Girdwood * regulator_get_id - get regulator ID 295669279fb9SMark Brown * @rdev: regulator 2957414c70cbSLiam Girdwood */ 2958414c70cbSLiam Girdwood int rdev_get_id(struct regulator_dev *rdev) 2959414c70cbSLiam Girdwood { 2960414c70cbSLiam Girdwood return rdev->desc->id; 2961414c70cbSLiam Girdwood } 2962414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_id); 2963414c70cbSLiam Girdwood 2964a5766f11SLiam Girdwood struct device *rdev_get_dev(struct regulator_dev *rdev) 2965a5766f11SLiam Girdwood { 2966a5766f11SLiam Girdwood return &rdev->dev; 2967a5766f11SLiam Girdwood } 2968a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_dev); 2969a5766f11SLiam Girdwood 2970a5766f11SLiam Girdwood void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2971a5766f11SLiam Girdwood { 2972a5766f11SLiam Girdwood return reg_init_data->driver_data; 2973a5766f11SLiam Girdwood } 2974a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2975a5766f11SLiam Girdwood 2976ba55a974SMark Brown #ifdef CONFIG_DEBUG_FS 2977ba55a974SMark Brown static ssize_t supply_map_read_file(struct file *file, char __user *user_buf, 2978ba55a974SMark Brown size_t count, loff_t *ppos) 2979ba55a974SMark Brown { 2980ba55a974SMark Brown char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); 2981ba55a974SMark Brown ssize_t len, ret = 0; 2982ba55a974SMark Brown struct regulator_map *map; 2983ba55a974SMark Brown 2984ba55a974SMark Brown if (!buf) 2985ba55a974SMark Brown return -ENOMEM; 2986ba55a974SMark Brown 2987ba55a974SMark Brown list_for_each_entry(map, ®ulator_map_list, list) { 2988ba55a974SMark Brown len = snprintf(buf + ret, PAGE_SIZE - ret, 2989ba55a974SMark Brown "%s -> %s.%s\n", 2990ba55a974SMark Brown rdev_get_name(map->regulator), map->dev_name, 2991ba55a974SMark Brown map->supply); 2992ba55a974SMark Brown if (len >= 0) 2993ba55a974SMark Brown ret += len; 2994ba55a974SMark Brown if (ret > PAGE_SIZE) { 2995ba55a974SMark Brown ret = PAGE_SIZE; 2996ba55a974SMark Brown break; 2997ba55a974SMark Brown } 2998ba55a974SMark Brown } 2999ba55a974SMark Brown 3000ba55a974SMark Brown ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); 3001ba55a974SMark Brown 3002ba55a974SMark Brown kfree(buf); 3003ba55a974SMark Brown 3004ba55a974SMark Brown return ret; 3005ba55a974SMark Brown } 3006ba55a974SMark Brown 3007ba55a974SMark Brown static const struct file_operations supply_map_fops = { 3008ba55a974SMark Brown .read = supply_map_read_file, 3009ba55a974SMark Brown .llseek = default_llseek, 3010ba55a974SMark Brown }; 3011ba55a974SMark Brown #endif 3012ba55a974SMark Brown 3013414c70cbSLiam Girdwood static int __init regulator_init(void) 3014414c70cbSLiam Girdwood { 301534abbd68SMark Brown int ret; 301634abbd68SMark Brown 301734abbd68SMark Brown ret = class_register(®ulator_class); 301834abbd68SMark Brown 30191130e5b3SMark Brown #ifdef CONFIG_DEBUG_FS 30201130e5b3SMark Brown debugfs_root = debugfs_create_dir("regulator", NULL); 30211130e5b3SMark Brown if (IS_ERR(debugfs_root) || !debugfs_root) { 30221130e5b3SMark Brown pr_warn("regulator: Failed to create debugfs directory\n"); 30231130e5b3SMark Brown debugfs_root = NULL; 30241130e5b3SMark Brown } 3025ba55a974SMark Brown 3026ba55a974SMark Brown if (IS_ERR(debugfs_create_file("supply_map", 0444, debugfs_root, 3027ba55a974SMark Brown NULL, &supply_map_fops))) 3028ba55a974SMark Brown pr_warn("regulator: Failed to create supplies debugfs\n"); 30291130e5b3SMark Brown #endif 30301130e5b3SMark Brown 303134abbd68SMark Brown regulator_dummy_init(); 303234abbd68SMark Brown 303334abbd68SMark Brown return ret; 3034414c70cbSLiam Girdwood } 3035414c70cbSLiam Girdwood 3036414c70cbSLiam Girdwood /* init early to allow our consumers to complete system booting */ 3037414c70cbSLiam Girdwood core_initcall(regulator_init); 3038ca725561SMark Brown 3039ca725561SMark Brown static int __init regulator_init_complete(void) 3040ca725561SMark Brown { 3041ca725561SMark Brown struct regulator_dev *rdev; 3042ca725561SMark Brown struct regulator_ops *ops; 3043ca725561SMark Brown struct regulation_constraints *c; 3044ca725561SMark Brown int enabled, ret; 3045ca725561SMark Brown 3046ca725561SMark Brown mutex_lock(®ulator_list_mutex); 3047ca725561SMark Brown 3048ca725561SMark Brown /* If we have a full configuration then disable any regulators 3049ca725561SMark Brown * which are not in use or always_on. This will become the 3050ca725561SMark Brown * default behaviour in the future. 3051ca725561SMark Brown */ 3052ca725561SMark Brown list_for_each_entry(rdev, ®ulator_list, list) { 3053ca725561SMark Brown ops = rdev->desc->ops; 3054ca725561SMark Brown c = rdev->constraints; 3055ca725561SMark Brown 3056f25e0b4fSMark Brown if (!ops->disable || (c && c->always_on)) 3057ca725561SMark Brown continue; 3058ca725561SMark Brown 3059ca725561SMark Brown mutex_lock(&rdev->mutex); 3060ca725561SMark Brown 3061ca725561SMark Brown if (rdev->use_count) 3062ca725561SMark Brown goto unlock; 3063ca725561SMark Brown 3064ca725561SMark Brown /* If we can't read the status assume it's on. */ 3065ca725561SMark Brown if (ops->is_enabled) 3066ca725561SMark Brown enabled = ops->is_enabled(rdev); 3067ca725561SMark Brown else 3068ca725561SMark Brown enabled = 1; 3069ca725561SMark Brown 3070ca725561SMark Brown if (!enabled) 3071ca725561SMark Brown goto unlock; 3072ca725561SMark Brown 3073ca725561SMark Brown if (has_full_constraints) { 3074ca725561SMark Brown /* We log since this may kill the system if it 3075ca725561SMark Brown * goes wrong. */ 30765da84fd9SJoe Perches rdev_info(rdev, "disabling\n"); 3077ca725561SMark Brown ret = ops->disable(rdev); 3078ca725561SMark Brown if (ret != 0) { 30795da84fd9SJoe Perches rdev_err(rdev, "couldn't disable: %d\n", ret); 3080ca725561SMark Brown } 3081ca725561SMark Brown } else { 3082ca725561SMark Brown /* The intention is that in future we will 3083ca725561SMark Brown * assume that full constraints are provided 3084ca725561SMark Brown * so warn even if we aren't going to do 3085ca725561SMark Brown * anything here. 3086ca725561SMark Brown */ 30875da84fd9SJoe Perches rdev_warn(rdev, "incomplete constraints, leaving on\n"); 3088ca725561SMark Brown } 3089ca725561SMark Brown 3090ca725561SMark Brown unlock: 3091ca725561SMark Brown mutex_unlock(&rdev->mutex); 3092ca725561SMark Brown } 3093ca725561SMark Brown 3094ca725561SMark Brown mutex_unlock(®ulator_list_mutex); 3095ca725561SMark Brown 3096ca725561SMark Brown return 0; 3097ca725561SMark Brown } 3098ca725561SMark Brown late_initcall(regulator_init_complete); 3099