1414c70cbSLiam Girdwood /* 2414c70cbSLiam Girdwood * core.c -- Voltage/Current Regulator framework. 3414c70cbSLiam Girdwood * 4414c70cbSLiam Girdwood * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5a5766f11SLiam Girdwood * Copyright 2008 SlimLogic Ltd. 6414c70cbSLiam Girdwood * 7a5766f11SLiam Girdwood * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8414c70cbSLiam Girdwood * 9414c70cbSLiam Girdwood * This program is free software; you can redistribute it and/or modify it 10414c70cbSLiam Girdwood * under the terms of the GNU General Public License as published by the 11414c70cbSLiam Girdwood * Free Software Foundation; either version 2 of the License, or (at your 12414c70cbSLiam Girdwood * option) any later version. 13414c70cbSLiam Girdwood * 14414c70cbSLiam Girdwood */ 15414c70cbSLiam Girdwood 16414c70cbSLiam Girdwood #include <linux/kernel.h> 17414c70cbSLiam Girdwood #include <linux/init.h> 18414c70cbSLiam Girdwood #include <linux/device.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 20414c70cbSLiam Girdwood #include <linux/err.h> 21414c70cbSLiam Girdwood #include <linux/mutex.h> 22414c70cbSLiam Girdwood #include <linux/suspend.h> 2331aae2beSMark Brown #include <linux/delay.h> 24414c70cbSLiam Girdwood #include <linux/regulator/consumer.h> 25414c70cbSLiam Girdwood #include <linux/regulator/driver.h> 26414c70cbSLiam Girdwood #include <linux/regulator/machine.h> 27414c70cbSLiam Girdwood 2802fa3ec0SMark Brown #define CREATE_TRACE_POINTS 2902fa3ec0SMark Brown #include <trace/events/regulator.h> 3002fa3ec0SMark Brown 3134abbd68SMark Brown #include "dummy.h" 3234abbd68SMark Brown 33414c70cbSLiam Girdwood #define REGULATOR_VERSION "0.5" 34414c70cbSLiam Girdwood 35414c70cbSLiam Girdwood static DEFINE_MUTEX(regulator_list_mutex); 36414c70cbSLiam Girdwood static LIST_HEAD(regulator_list); 37414c70cbSLiam Girdwood static LIST_HEAD(regulator_map_list); 38ca725561SMark Brown static int has_full_constraints; 39688fe99aSMark Brown static bool board_wants_dummy_regulator; 40414c70cbSLiam Girdwood 418dc5390dSMark Brown /* 42414c70cbSLiam Girdwood * struct regulator_map 43414c70cbSLiam Girdwood * 44414c70cbSLiam Girdwood * Used to provide symbolic supply names to devices. 45414c70cbSLiam Girdwood */ 46414c70cbSLiam Girdwood struct regulator_map { 47414c70cbSLiam Girdwood struct list_head list; 4840f9244fSMark Brown const char *dev_name; /* The dev_name() for the consumer */ 49414c70cbSLiam Girdwood const char *supply; 50a5766f11SLiam Girdwood struct regulator_dev *regulator; 51414c70cbSLiam Girdwood }; 52414c70cbSLiam Girdwood 53414c70cbSLiam Girdwood /* 54414c70cbSLiam Girdwood * struct regulator 55414c70cbSLiam Girdwood * 56414c70cbSLiam Girdwood * One for each consumer device. 57414c70cbSLiam Girdwood */ 58414c70cbSLiam Girdwood struct regulator { 59414c70cbSLiam Girdwood struct device *dev; 60414c70cbSLiam Girdwood struct list_head list; 61414c70cbSLiam Girdwood int uA_load; 62414c70cbSLiam Girdwood int min_uV; 63414c70cbSLiam Girdwood int max_uV; 64414c70cbSLiam Girdwood char *supply_name; 65414c70cbSLiam Girdwood struct device_attribute dev_attr; 66414c70cbSLiam Girdwood struct regulator_dev *rdev; 67414c70cbSLiam Girdwood }; 68414c70cbSLiam Girdwood 69414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev); 708cbf811dSJeffrey Carlyle static int _regulator_disable(struct regulator_dev *rdev, 718cbf811dSJeffrey Carlyle struct regulator_dev **supply_rdev_ptr); 72414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev); 73414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev); 74414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 75414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 76414c70cbSLiam Girdwood unsigned long event, void *data); 77414c70cbSLiam Girdwood 781083c393SMark Brown static const char *rdev_get_name(struct regulator_dev *rdev) 791083c393SMark Brown { 801083c393SMark Brown if (rdev->constraints && rdev->constraints->name) 811083c393SMark Brown return rdev->constraints->name; 821083c393SMark Brown else if (rdev->desc->name) 831083c393SMark Brown return rdev->desc->name; 841083c393SMark Brown else 851083c393SMark Brown return ""; 861083c393SMark Brown } 871083c393SMark Brown 88414c70cbSLiam Girdwood /* gets the regulator for a given consumer device */ 89414c70cbSLiam Girdwood static struct regulator *get_device_regulator(struct device *dev) 90414c70cbSLiam Girdwood { 91414c70cbSLiam Girdwood struct regulator *regulator = NULL; 92414c70cbSLiam Girdwood struct regulator_dev *rdev; 93414c70cbSLiam Girdwood 94414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 95414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 96414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 97414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) { 98414c70cbSLiam Girdwood if (regulator->dev == dev) { 99414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 100414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 101414c70cbSLiam Girdwood return regulator; 102414c70cbSLiam Girdwood } 103414c70cbSLiam Girdwood } 104414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 105414c70cbSLiam Girdwood } 106414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 107414c70cbSLiam Girdwood return NULL; 108414c70cbSLiam Girdwood } 109414c70cbSLiam Girdwood 110414c70cbSLiam Girdwood /* Platform voltage constraint check */ 111414c70cbSLiam Girdwood static int regulator_check_voltage(struct regulator_dev *rdev, 112414c70cbSLiam Girdwood int *min_uV, int *max_uV) 113414c70cbSLiam Girdwood { 114414c70cbSLiam Girdwood BUG_ON(*min_uV > *max_uV); 115414c70cbSLiam Girdwood 116414c70cbSLiam Girdwood if (!rdev->constraints) { 117414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1181083c393SMark Brown rdev_get_name(rdev)); 119414c70cbSLiam Girdwood return -ENODEV; 120414c70cbSLiam Girdwood } 121414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 122414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1231083c393SMark Brown __func__, rdev_get_name(rdev)); 124414c70cbSLiam Girdwood return -EPERM; 125414c70cbSLiam Girdwood } 126414c70cbSLiam Girdwood 127414c70cbSLiam Girdwood if (*max_uV > rdev->constraints->max_uV) 128414c70cbSLiam Girdwood *max_uV = rdev->constraints->max_uV; 129414c70cbSLiam Girdwood if (*min_uV < rdev->constraints->min_uV) 130414c70cbSLiam Girdwood *min_uV = rdev->constraints->min_uV; 131414c70cbSLiam Girdwood 132414c70cbSLiam Girdwood if (*min_uV > *max_uV) 133414c70cbSLiam Girdwood return -EINVAL; 134414c70cbSLiam Girdwood 135414c70cbSLiam Girdwood return 0; 136414c70cbSLiam Girdwood } 137414c70cbSLiam Girdwood 138414c70cbSLiam Girdwood /* current constraint check */ 139414c70cbSLiam Girdwood static int regulator_check_current_limit(struct regulator_dev *rdev, 140414c70cbSLiam Girdwood int *min_uA, int *max_uA) 141414c70cbSLiam Girdwood { 142414c70cbSLiam Girdwood BUG_ON(*min_uA > *max_uA); 143414c70cbSLiam Girdwood 144414c70cbSLiam Girdwood if (!rdev->constraints) { 145414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1461083c393SMark Brown rdev_get_name(rdev)); 147414c70cbSLiam Girdwood return -ENODEV; 148414c70cbSLiam Girdwood } 149414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 150414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1511083c393SMark Brown __func__, rdev_get_name(rdev)); 152414c70cbSLiam Girdwood return -EPERM; 153414c70cbSLiam Girdwood } 154414c70cbSLiam Girdwood 155414c70cbSLiam Girdwood if (*max_uA > rdev->constraints->max_uA) 156414c70cbSLiam Girdwood *max_uA = rdev->constraints->max_uA; 157414c70cbSLiam Girdwood if (*min_uA < rdev->constraints->min_uA) 158414c70cbSLiam Girdwood *min_uA = rdev->constraints->min_uA; 159414c70cbSLiam Girdwood 160414c70cbSLiam Girdwood if (*min_uA > *max_uA) 161414c70cbSLiam Girdwood return -EINVAL; 162414c70cbSLiam Girdwood 163414c70cbSLiam Girdwood return 0; 164414c70cbSLiam Girdwood } 165414c70cbSLiam Girdwood 166414c70cbSLiam Girdwood /* operating mode constraint check */ 167414c70cbSLiam Girdwood static int regulator_check_mode(struct regulator_dev *rdev, int mode) 168414c70cbSLiam Girdwood { 169e573520bSDavid Brownell switch (mode) { 170e573520bSDavid Brownell case REGULATOR_MODE_FAST: 171e573520bSDavid Brownell case REGULATOR_MODE_NORMAL: 172e573520bSDavid Brownell case REGULATOR_MODE_IDLE: 173e573520bSDavid Brownell case REGULATOR_MODE_STANDBY: 174e573520bSDavid Brownell break; 175e573520bSDavid Brownell default: 176e573520bSDavid Brownell return -EINVAL; 177e573520bSDavid Brownell } 178e573520bSDavid Brownell 179414c70cbSLiam Girdwood if (!rdev->constraints) { 180414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1811083c393SMark Brown rdev_get_name(rdev)); 182414c70cbSLiam Girdwood return -ENODEV; 183414c70cbSLiam Girdwood } 184414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 185414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1861083c393SMark Brown __func__, rdev_get_name(rdev)); 187414c70cbSLiam Girdwood return -EPERM; 188414c70cbSLiam Girdwood } 189414c70cbSLiam Girdwood if (!(rdev->constraints->valid_modes_mask & mode)) { 190414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid mode %x for %s\n", 1911083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 192414c70cbSLiam Girdwood return -EINVAL; 193414c70cbSLiam Girdwood } 194414c70cbSLiam Girdwood return 0; 195414c70cbSLiam Girdwood } 196414c70cbSLiam Girdwood 197414c70cbSLiam Girdwood /* dynamic regulator mode switching constraint check */ 198414c70cbSLiam Girdwood static int regulator_check_drms(struct regulator_dev *rdev) 199414c70cbSLiam Girdwood { 200414c70cbSLiam Girdwood if (!rdev->constraints) { 201414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 2021083c393SMark Brown rdev_get_name(rdev)); 203414c70cbSLiam Girdwood return -ENODEV; 204414c70cbSLiam Girdwood } 205414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 206414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 2071083c393SMark Brown __func__, rdev_get_name(rdev)); 208414c70cbSLiam Girdwood return -EPERM; 209414c70cbSLiam Girdwood } 210414c70cbSLiam Girdwood return 0; 211414c70cbSLiam Girdwood } 212414c70cbSLiam Girdwood 213414c70cbSLiam Girdwood static ssize_t device_requested_uA_show(struct device *dev, 214414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 215414c70cbSLiam Girdwood { 216414c70cbSLiam Girdwood struct regulator *regulator; 217414c70cbSLiam Girdwood 218414c70cbSLiam Girdwood regulator = get_device_regulator(dev); 219414c70cbSLiam Girdwood if (regulator == NULL) 220414c70cbSLiam Girdwood return 0; 221414c70cbSLiam Girdwood 222414c70cbSLiam Girdwood return sprintf(buf, "%d\n", regulator->uA_load); 223414c70cbSLiam Girdwood } 224414c70cbSLiam Girdwood 225414c70cbSLiam Girdwood static ssize_t regulator_uV_show(struct device *dev, 226414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 227414c70cbSLiam Girdwood { 228a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 229414c70cbSLiam Girdwood ssize_t ret; 230414c70cbSLiam Girdwood 231414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 232414c70cbSLiam Girdwood ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 233414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 234414c70cbSLiam Girdwood 235414c70cbSLiam Girdwood return ret; 236414c70cbSLiam Girdwood } 2377ad68e2fSDavid Brownell static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 238414c70cbSLiam Girdwood 239414c70cbSLiam Girdwood static ssize_t regulator_uA_show(struct device *dev, 240414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 241414c70cbSLiam Girdwood { 242a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 243414c70cbSLiam Girdwood 244414c70cbSLiam Girdwood return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 245414c70cbSLiam Girdwood } 2467ad68e2fSDavid Brownell static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 247414c70cbSLiam Girdwood 248bc558a60SMark Brown static ssize_t regulator_name_show(struct device *dev, 249bc558a60SMark Brown struct device_attribute *attr, char *buf) 250bc558a60SMark Brown { 251bc558a60SMark Brown struct regulator_dev *rdev = dev_get_drvdata(dev); 252bc558a60SMark Brown 2531083c393SMark Brown return sprintf(buf, "%s\n", rdev_get_name(rdev)); 254bc558a60SMark Brown } 255bc558a60SMark Brown 2564fca9545SDavid Brownell static ssize_t regulator_print_opmode(char *buf, int mode) 257414c70cbSLiam Girdwood { 258414c70cbSLiam Girdwood switch (mode) { 259414c70cbSLiam Girdwood case REGULATOR_MODE_FAST: 260414c70cbSLiam Girdwood return sprintf(buf, "fast\n"); 261414c70cbSLiam Girdwood case REGULATOR_MODE_NORMAL: 262414c70cbSLiam Girdwood return sprintf(buf, "normal\n"); 263414c70cbSLiam Girdwood case REGULATOR_MODE_IDLE: 264414c70cbSLiam Girdwood return sprintf(buf, "idle\n"); 265414c70cbSLiam Girdwood case REGULATOR_MODE_STANDBY: 266414c70cbSLiam Girdwood return sprintf(buf, "standby\n"); 267414c70cbSLiam Girdwood } 268414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 269414c70cbSLiam Girdwood } 270414c70cbSLiam Girdwood 2714fca9545SDavid Brownell static ssize_t regulator_opmode_show(struct device *dev, 272414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 273414c70cbSLiam Girdwood { 274a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 275414c70cbSLiam Girdwood 2764fca9545SDavid Brownell return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 2774fca9545SDavid Brownell } 2787ad68e2fSDavid Brownell static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 2794fca9545SDavid Brownell 2804fca9545SDavid Brownell static ssize_t regulator_print_state(char *buf, int state) 2814fca9545SDavid Brownell { 282414c70cbSLiam Girdwood if (state > 0) 283414c70cbSLiam Girdwood return sprintf(buf, "enabled\n"); 284414c70cbSLiam Girdwood else if (state == 0) 285414c70cbSLiam Girdwood return sprintf(buf, "disabled\n"); 286414c70cbSLiam Girdwood else 287414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 288414c70cbSLiam Girdwood } 289414c70cbSLiam Girdwood 2904fca9545SDavid Brownell static ssize_t regulator_state_show(struct device *dev, 2914fca9545SDavid Brownell struct device_attribute *attr, char *buf) 2924fca9545SDavid Brownell { 2934fca9545SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 2949332546fSMark Brown ssize_t ret; 2954fca9545SDavid Brownell 2969332546fSMark Brown mutex_lock(&rdev->mutex); 2979332546fSMark Brown ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 2989332546fSMark Brown mutex_unlock(&rdev->mutex); 2999332546fSMark Brown 3009332546fSMark Brown return ret; 3014fca9545SDavid Brownell } 3027ad68e2fSDavid Brownell static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 3034fca9545SDavid Brownell 304853116a1SDavid Brownell static ssize_t regulator_status_show(struct device *dev, 305853116a1SDavid Brownell struct device_attribute *attr, char *buf) 306853116a1SDavid Brownell { 307853116a1SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 308853116a1SDavid Brownell int status; 309853116a1SDavid Brownell char *label; 310853116a1SDavid Brownell 311853116a1SDavid Brownell status = rdev->desc->ops->get_status(rdev); 312853116a1SDavid Brownell if (status < 0) 313853116a1SDavid Brownell return status; 314853116a1SDavid Brownell 315853116a1SDavid Brownell switch (status) { 316853116a1SDavid Brownell case REGULATOR_STATUS_OFF: 317853116a1SDavid Brownell label = "off"; 318853116a1SDavid Brownell break; 319853116a1SDavid Brownell case REGULATOR_STATUS_ON: 320853116a1SDavid Brownell label = "on"; 321853116a1SDavid Brownell break; 322853116a1SDavid Brownell case REGULATOR_STATUS_ERROR: 323853116a1SDavid Brownell label = "error"; 324853116a1SDavid Brownell break; 325853116a1SDavid Brownell case REGULATOR_STATUS_FAST: 326853116a1SDavid Brownell label = "fast"; 327853116a1SDavid Brownell break; 328853116a1SDavid Brownell case REGULATOR_STATUS_NORMAL: 329853116a1SDavid Brownell label = "normal"; 330853116a1SDavid Brownell break; 331853116a1SDavid Brownell case REGULATOR_STATUS_IDLE: 332853116a1SDavid Brownell label = "idle"; 333853116a1SDavid Brownell break; 334853116a1SDavid Brownell case REGULATOR_STATUS_STANDBY: 335853116a1SDavid Brownell label = "standby"; 336853116a1SDavid Brownell break; 337853116a1SDavid Brownell default: 338853116a1SDavid Brownell return -ERANGE; 339853116a1SDavid Brownell } 340853116a1SDavid Brownell 341853116a1SDavid Brownell return sprintf(buf, "%s\n", label); 342853116a1SDavid Brownell } 343853116a1SDavid Brownell static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 344853116a1SDavid Brownell 345414c70cbSLiam Girdwood static ssize_t regulator_min_uA_show(struct device *dev, 346414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 347414c70cbSLiam Girdwood { 348a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 349414c70cbSLiam Girdwood 350414c70cbSLiam Girdwood if (!rdev->constraints) 351414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 352414c70cbSLiam Girdwood 353414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uA); 354414c70cbSLiam Girdwood } 3557ad68e2fSDavid Brownell static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 356414c70cbSLiam Girdwood 357414c70cbSLiam Girdwood static ssize_t regulator_max_uA_show(struct device *dev, 358414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 359414c70cbSLiam Girdwood { 360a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 361414c70cbSLiam Girdwood 362414c70cbSLiam Girdwood if (!rdev->constraints) 363414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 364414c70cbSLiam Girdwood 365414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uA); 366414c70cbSLiam Girdwood } 3677ad68e2fSDavid Brownell static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 368414c70cbSLiam Girdwood 369414c70cbSLiam Girdwood static ssize_t regulator_min_uV_show(struct device *dev, 370414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 371414c70cbSLiam Girdwood { 372a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 373414c70cbSLiam Girdwood 374414c70cbSLiam Girdwood if (!rdev->constraints) 375414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 376414c70cbSLiam Girdwood 377414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uV); 378414c70cbSLiam Girdwood } 3797ad68e2fSDavid Brownell static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 380414c70cbSLiam Girdwood 381414c70cbSLiam Girdwood static ssize_t regulator_max_uV_show(struct device *dev, 382414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 383414c70cbSLiam Girdwood { 384a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 385414c70cbSLiam Girdwood 386414c70cbSLiam Girdwood if (!rdev->constraints) 387414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 388414c70cbSLiam Girdwood 389414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uV); 390414c70cbSLiam Girdwood } 3917ad68e2fSDavid Brownell static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 392414c70cbSLiam Girdwood 393414c70cbSLiam Girdwood static ssize_t regulator_total_uA_show(struct device *dev, 394414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 395414c70cbSLiam Girdwood { 396a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 397414c70cbSLiam Girdwood struct regulator *regulator; 398414c70cbSLiam Girdwood int uA = 0; 399414c70cbSLiam Girdwood 400414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 401414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) 402414c70cbSLiam Girdwood uA += regulator->uA_load; 403414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 404414c70cbSLiam Girdwood return sprintf(buf, "%d\n", uA); 405414c70cbSLiam Girdwood } 4067ad68e2fSDavid Brownell static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 407414c70cbSLiam Girdwood 408414c70cbSLiam Girdwood static ssize_t regulator_num_users_show(struct device *dev, 409414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 410414c70cbSLiam Girdwood { 411a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 412414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->use_count); 413414c70cbSLiam Girdwood } 414414c70cbSLiam Girdwood 415414c70cbSLiam Girdwood static ssize_t regulator_type_show(struct device *dev, 416414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 417414c70cbSLiam Girdwood { 418a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 419414c70cbSLiam Girdwood 420414c70cbSLiam Girdwood switch (rdev->desc->type) { 421414c70cbSLiam Girdwood case REGULATOR_VOLTAGE: 422414c70cbSLiam Girdwood return sprintf(buf, "voltage\n"); 423414c70cbSLiam Girdwood case REGULATOR_CURRENT: 424414c70cbSLiam Girdwood return sprintf(buf, "current\n"); 425414c70cbSLiam Girdwood } 426414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 427414c70cbSLiam Girdwood } 428414c70cbSLiam Girdwood 429414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 430414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 431414c70cbSLiam Girdwood { 432a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 433414c70cbSLiam Girdwood 434414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 435414c70cbSLiam Girdwood } 4367ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_microvolts, 0444, 4377ad68e2fSDavid Brownell regulator_suspend_mem_uV_show, NULL); 438414c70cbSLiam Girdwood 439414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 440414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 441414c70cbSLiam Girdwood { 442a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 443414c70cbSLiam Girdwood 444414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 445414c70cbSLiam Girdwood } 4467ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_microvolts, 0444, 4477ad68e2fSDavid Brownell regulator_suspend_disk_uV_show, NULL); 448414c70cbSLiam Girdwood 449414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 450414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 451414c70cbSLiam Girdwood { 452a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 453414c70cbSLiam Girdwood 454414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 455414c70cbSLiam Girdwood } 4567ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_microvolts, 0444, 4577ad68e2fSDavid Brownell regulator_suspend_standby_uV_show, NULL); 458414c70cbSLiam Girdwood 459414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 460414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 461414c70cbSLiam Girdwood { 462a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 463414c70cbSLiam Girdwood 4644fca9545SDavid Brownell return regulator_print_opmode(buf, 4654fca9545SDavid Brownell rdev->constraints->state_mem.mode); 466414c70cbSLiam Girdwood } 4677ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_mode, 0444, 4687ad68e2fSDavid Brownell regulator_suspend_mem_mode_show, NULL); 469414c70cbSLiam Girdwood 470414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 471414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 472414c70cbSLiam Girdwood { 473a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 474414c70cbSLiam Girdwood 4754fca9545SDavid Brownell return regulator_print_opmode(buf, 4764fca9545SDavid Brownell rdev->constraints->state_disk.mode); 477414c70cbSLiam Girdwood } 4787ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_mode, 0444, 4797ad68e2fSDavid Brownell regulator_suspend_disk_mode_show, NULL); 480414c70cbSLiam Girdwood 481414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 482414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 483414c70cbSLiam Girdwood { 484a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 485414c70cbSLiam Girdwood 4864fca9545SDavid Brownell return regulator_print_opmode(buf, 4874fca9545SDavid Brownell rdev->constraints->state_standby.mode); 488414c70cbSLiam Girdwood } 4897ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_mode, 0444, 4907ad68e2fSDavid Brownell regulator_suspend_standby_mode_show, NULL); 491414c70cbSLiam Girdwood 492414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_state_show(struct device *dev, 493414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 494414c70cbSLiam Girdwood { 495a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 496414c70cbSLiam Girdwood 4974fca9545SDavid Brownell return regulator_print_state(buf, 4984fca9545SDavid Brownell rdev->constraints->state_mem.enabled); 499414c70cbSLiam Girdwood } 5007ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_state, 0444, 5017ad68e2fSDavid Brownell regulator_suspend_mem_state_show, NULL); 502414c70cbSLiam Girdwood 503414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_state_show(struct device *dev, 504414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 505414c70cbSLiam Girdwood { 506a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 507414c70cbSLiam Girdwood 5084fca9545SDavid Brownell return regulator_print_state(buf, 5094fca9545SDavid Brownell rdev->constraints->state_disk.enabled); 510414c70cbSLiam Girdwood } 5117ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_state, 0444, 5127ad68e2fSDavid Brownell regulator_suspend_disk_state_show, NULL); 513414c70cbSLiam Girdwood 514414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_state_show(struct device *dev, 515414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 516414c70cbSLiam Girdwood { 517a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 518414c70cbSLiam Girdwood 5194fca9545SDavid Brownell return regulator_print_state(buf, 5204fca9545SDavid Brownell rdev->constraints->state_standby.enabled); 521414c70cbSLiam Girdwood } 5227ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_state, 0444, 5237ad68e2fSDavid Brownell regulator_suspend_standby_state_show, NULL); 524bc558a60SMark Brown 5257ad68e2fSDavid Brownell 5267ad68e2fSDavid Brownell /* 5277ad68e2fSDavid Brownell * These are the only attributes are present for all regulators. 5287ad68e2fSDavid Brownell * Other attributes are a function of regulator functionality. 5297ad68e2fSDavid Brownell */ 530414c70cbSLiam Girdwood static struct device_attribute regulator_dev_attrs[] = { 531bc558a60SMark Brown __ATTR(name, 0444, regulator_name_show, NULL), 532414c70cbSLiam Girdwood __ATTR(num_users, 0444, regulator_num_users_show, NULL), 533414c70cbSLiam Girdwood __ATTR(type, 0444, regulator_type_show, NULL), 534414c70cbSLiam Girdwood __ATTR_NULL, 535414c70cbSLiam Girdwood }; 536414c70cbSLiam Girdwood 537414c70cbSLiam Girdwood static void regulator_dev_release(struct device *dev) 538414c70cbSLiam Girdwood { 539a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 540414c70cbSLiam Girdwood kfree(rdev); 541414c70cbSLiam Girdwood } 542414c70cbSLiam Girdwood 543414c70cbSLiam Girdwood static struct class regulator_class = { 544414c70cbSLiam Girdwood .name = "regulator", 545414c70cbSLiam Girdwood .dev_release = regulator_dev_release, 546414c70cbSLiam Girdwood .dev_attrs = regulator_dev_attrs, 547414c70cbSLiam Girdwood }; 548414c70cbSLiam Girdwood 549414c70cbSLiam Girdwood /* Calculate the new optimum regulator operating mode based on the new total 550414c70cbSLiam Girdwood * consumer load. All locks held by caller */ 551414c70cbSLiam Girdwood static void drms_uA_update(struct regulator_dev *rdev) 552414c70cbSLiam Girdwood { 553414c70cbSLiam Girdwood struct regulator *sibling; 554414c70cbSLiam Girdwood int current_uA = 0, output_uV, input_uV, err; 555414c70cbSLiam Girdwood unsigned int mode; 556414c70cbSLiam Girdwood 557414c70cbSLiam Girdwood err = regulator_check_drms(rdev); 558414c70cbSLiam Girdwood if (err < 0 || !rdev->desc->ops->get_optimum_mode || 559036de8efSDan Carpenter !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) 560414c70cbSLiam Girdwood return; 561414c70cbSLiam Girdwood 562414c70cbSLiam Girdwood /* get output voltage */ 563414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 564414c70cbSLiam Girdwood if (output_uV <= 0) 565414c70cbSLiam Girdwood return; 566414c70cbSLiam Girdwood 567414c70cbSLiam Girdwood /* get input voltage */ 568414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 569414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 570414c70cbSLiam Girdwood else 571414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 572414c70cbSLiam Girdwood if (input_uV <= 0) 573414c70cbSLiam Girdwood return; 574414c70cbSLiam Girdwood 575414c70cbSLiam Girdwood /* calc total requested load */ 576414c70cbSLiam Girdwood list_for_each_entry(sibling, &rdev->consumer_list, list) 577414c70cbSLiam Girdwood current_uA += sibling->uA_load; 578414c70cbSLiam Girdwood 579414c70cbSLiam Girdwood /* now get the optimum mode for our new total regulator load */ 580414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 581414c70cbSLiam Girdwood output_uV, current_uA); 582414c70cbSLiam Girdwood 583414c70cbSLiam Girdwood /* check the new mode is allowed */ 584414c70cbSLiam Girdwood err = regulator_check_mode(rdev, mode); 585414c70cbSLiam Girdwood if (err == 0) 586414c70cbSLiam Girdwood rdev->desc->ops->set_mode(rdev, mode); 587414c70cbSLiam Girdwood } 588414c70cbSLiam Girdwood 589414c70cbSLiam Girdwood static int suspend_set_state(struct regulator_dev *rdev, 590414c70cbSLiam Girdwood struct regulator_state *rstate) 591414c70cbSLiam Girdwood { 592414c70cbSLiam Girdwood int ret = 0; 593638f85c5SMark Brown bool can_set_state; 594414c70cbSLiam Girdwood 595638f85c5SMark Brown can_set_state = rdev->desc->ops->set_suspend_enable && 596638f85c5SMark Brown rdev->desc->ops->set_suspend_disable; 597638f85c5SMark Brown 598638f85c5SMark Brown /* If we have no suspend mode configration don't set anything; 599638f85c5SMark Brown * only warn if the driver actually makes the suspend mode 600638f85c5SMark Brown * configurable. 601638f85c5SMark Brown */ 602638f85c5SMark Brown if (!rstate->enabled && !rstate->disabled) { 603638f85c5SMark Brown if (can_set_state) 604638f85c5SMark Brown printk(KERN_WARNING "%s: No configuration for %s\n", 605638f85c5SMark Brown __func__, rdev_get_name(rdev)); 606638f85c5SMark Brown return 0; 607638f85c5SMark Brown } 608638f85c5SMark Brown 609638f85c5SMark Brown if (rstate->enabled && rstate->disabled) { 610638f85c5SMark Brown printk(KERN_ERR "%s: invalid configuration for %s\n", 611638f85c5SMark Brown __func__, rdev_get_name(rdev)); 612638f85c5SMark Brown return -EINVAL; 613638f85c5SMark Brown } 614638f85c5SMark Brown 615638f85c5SMark Brown if (!can_set_state) { 616a5766f11SLiam Girdwood printk(KERN_ERR "%s: no way to set suspend state\n", 617a5766f11SLiam Girdwood __func__); 618414c70cbSLiam Girdwood return -EINVAL; 619a5766f11SLiam Girdwood } 620414c70cbSLiam Girdwood 621414c70cbSLiam Girdwood if (rstate->enabled) 622414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_enable(rdev); 623414c70cbSLiam Girdwood else 624414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_disable(rdev); 625414c70cbSLiam Girdwood if (ret < 0) { 626414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 627414c70cbSLiam Girdwood return ret; 628414c70cbSLiam Girdwood } 629414c70cbSLiam Girdwood 630414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 631414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 632414c70cbSLiam Girdwood if (ret < 0) { 633414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set voltage\n", 634414c70cbSLiam Girdwood __func__); 635414c70cbSLiam Girdwood return ret; 636414c70cbSLiam Girdwood } 637414c70cbSLiam Girdwood } 638414c70cbSLiam Girdwood 639414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 640414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 641414c70cbSLiam Girdwood if (ret < 0) { 642414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set mode\n", __func__); 643414c70cbSLiam Girdwood return ret; 644414c70cbSLiam Girdwood } 645414c70cbSLiam Girdwood } 646414c70cbSLiam Girdwood return ret; 647414c70cbSLiam Girdwood } 648414c70cbSLiam Girdwood 649414c70cbSLiam Girdwood /* locks held by caller */ 650414c70cbSLiam Girdwood static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 651414c70cbSLiam Girdwood { 652414c70cbSLiam Girdwood if (!rdev->constraints) 653414c70cbSLiam Girdwood return -EINVAL; 654414c70cbSLiam Girdwood 655414c70cbSLiam Girdwood switch (state) { 656414c70cbSLiam Girdwood case PM_SUSPEND_STANDBY: 657414c70cbSLiam Girdwood return suspend_set_state(rdev, 658414c70cbSLiam Girdwood &rdev->constraints->state_standby); 659414c70cbSLiam Girdwood case PM_SUSPEND_MEM: 660414c70cbSLiam Girdwood return suspend_set_state(rdev, 661414c70cbSLiam Girdwood &rdev->constraints->state_mem); 662414c70cbSLiam Girdwood case PM_SUSPEND_MAX: 663414c70cbSLiam Girdwood return suspend_set_state(rdev, 664414c70cbSLiam Girdwood &rdev->constraints->state_disk); 665414c70cbSLiam Girdwood default: 666414c70cbSLiam Girdwood return -EINVAL; 667414c70cbSLiam Girdwood } 668414c70cbSLiam Girdwood } 669414c70cbSLiam Girdwood 670414c70cbSLiam Girdwood static void print_constraints(struct regulator_dev *rdev) 671414c70cbSLiam Girdwood { 672414c70cbSLiam Girdwood struct regulation_constraints *constraints = rdev->constraints; 673973e9a27SMark Brown char buf[80] = ""; 6748f031b48SMark Brown int count = 0; 6758f031b48SMark Brown int ret; 676414c70cbSLiam Girdwood 6778f031b48SMark Brown if (constraints->min_uV && constraints->max_uV) { 678414c70cbSLiam Girdwood if (constraints->min_uV == constraints->max_uV) 6798f031b48SMark Brown count += sprintf(buf + count, "%d mV ", 680414c70cbSLiam Girdwood constraints->min_uV / 1000); 681414c70cbSLiam Girdwood else 6828f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mV ", 683414c70cbSLiam Girdwood constraints->min_uV / 1000, 684414c70cbSLiam Girdwood constraints->max_uV / 1000); 6858f031b48SMark Brown } 6868f031b48SMark Brown 6878f031b48SMark Brown if (!constraints->min_uV || 6888f031b48SMark Brown constraints->min_uV != constraints->max_uV) { 6898f031b48SMark Brown ret = _regulator_get_voltage(rdev); 6908f031b48SMark Brown if (ret > 0) 6918f031b48SMark Brown count += sprintf(buf + count, "at %d mV ", ret / 1000); 6928f031b48SMark Brown } 6938f031b48SMark Brown 6948f031b48SMark Brown if (constraints->min_uA && constraints->max_uA) { 695414c70cbSLiam Girdwood if (constraints->min_uA == constraints->max_uA) 6968f031b48SMark Brown count += sprintf(buf + count, "%d mA ", 697414c70cbSLiam Girdwood constraints->min_uA / 1000); 698414c70cbSLiam Girdwood else 6998f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mA ", 700414c70cbSLiam Girdwood constraints->min_uA / 1000, 701414c70cbSLiam Girdwood constraints->max_uA / 1000); 702414c70cbSLiam Girdwood } 7038f031b48SMark Brown 7048f031b48SMark Brown if (!constraints->min_uA || 7058f031b48SMark Brown constraints->min_uA != constraints->max_uA) { 7068f031b48SMark Brown ret = _regulator_get_current_limit(rdev); 7078f031b48SMark Brown if (ret > 0) 708e4a6376bSCyril Chemparathy count += sprintf(buf + count, "at %d mA ", ret / 1000); 7098f031b48SMark Brown } 7108f031b48SMark Brown 711414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 712414c70cbSLiam Girdwood count += sprintf(buf + count, "fast "); 713414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 714414c70cbSLiam Girdwood count += sprintf(buf + count, "normal "); 715414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 716414c70cbSLiam Girdwood count += sprintf(buf + count, "idle "); 717414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 718414c70cbSLiam Girdwood count += sprintf(buf + count, "standby"); 719414c70cbSLiam Girdwood 7201083c393SMark Brown printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); 721414c70cbSLiam Girdwood } 722414c70cbSLiam Girdwood 723e79055d6SMark Brown static int machine_constraints_voltage(struct regulator_dev *rdev, 7241083c393SMark Brown struct regulation_constraints *constraints) 725e79055d6SMark Brown { 726e79055d6SMark Brown struct regulator_ops *ops = rdev->desc->ops; 7271083c393SMark Brown const char *name = rdev_get_name(rdev); 728af5866c9SMark Brown int ret; 7293a93f2a9SMark Brown unsigned selector; 730af5866c9SMark Brown 731af5866c9SMark Brown /* do we need to apply the constraint voltage */ 732af5866c9SMark Brown if (rdev->constraints->apply_uV && 733af5866c9SMark Brown rdev->constraints->min_uV == rdev->constraints->max_uV && 734af5866c9SMark Brown ops->set_voltage) { 735af5866c9SMark Brown ret = ops->set_voltage(rdev, 7363a93f2a9SMark Brown rdev->constraints->min_uV, 7373a93f2a9SMark Brown rdev->constraints->max_uV, 7383a93f2a9SMark Brown &selector); 739af5866c9SMark Brown if (ret < 0) { 740af5866c9SMark Brown printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 741af5866c9SMark Brown __func__, 742af5866c9SMark Brown rdev->constraints->min_uV, name); 743af5866c9SMark Brown rdev->constraints = NULL; 744af5866c9SMark Brown return ret; 745af5866c9SMark Brown } 746af5866c9SMark Brown } 747e79055d6SMark Brown 748e79055d6SMark Brown /* constrain machine-level voltage specs to fit 749e79055d6SMark Brown * the actual range supported by this regulator. 750e79055d6SMark Brown */ 751e79055d6SMark Brown if (ops->list_voltage && rdev->desc->n_voltages) { 752e79055d6SMark Brown int count = rdev->desc->n_voltages; 753e79055d6SMark Brown int i; 754e79055d6SMark Brown int min_uV = INT_MAX; 755e79055d6SMark Brown int max_uV = INT_MIN; 756e79055d6SMark Brown int cmin = constraints->min_uV; 757e79055d6SMark Brown int cmax = constraints->max_uV; 758e79055d6SMark Brown 759e79055d6SMark Brown /* it's safe to autoconfigure fixed-voltage supplies 760e79055d6SMark Brown and the constraints are used by list_voltage. */ 761e79055d6SMark Brown if (count == 1 && !cmin) { 762e79055d6SMark Brown cmin = 1; 763e79055d6SMark Brown cmax = INT_MAX; 764e79055d6SMark Brown constraints->min_uV = cmin; 765e79055d6SMark Brown constraints->max_uV = cmax; 766e79055d6SMark Brown } 767e79055d6SMark Brown 768e79055d6SMark Brown /* voltage constraints are optional */ 769e79055d6SMark Brown if ((cmin == 0) && (cmax == 0)) 770e79055d6SMark Brown return 0; 771e79055d6SMark Brown 772e79055d6SMark Brown /* else require explicit machine-level constraints */ 773e79055d6SMark Brown if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 774e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 775e79055d6SMark Brown __func__, "invalid", name); 776e79055d6SMark Brown return -EINVAL; 777e79055d6SMark Brown } 778e79055d6SMark Brown 779e79055d6SMark Brown /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 780e79055d6SMark Brown for (i = 0; i < count; i++) { 781e79055d6SMark Brown int value; 782e79055d6SMark Brown 783e79055d6SMark Brown value = ops->list_voltage(rdev, i); 784e79055d6SMark Brown if (value <= 0) 785e79055d6SMark Brown continue; 786e79055d6SMark Brown 787e79055d6SMark Brown /* maybe adjust [min_uV..max_uV] */ 788e79055d6SMark Brown if (value >= cmin && value < min_uV) 789e79055d6SMark Brown min_uV = value; 790e79055d6SMark Brown if (value <= cmax && value > max_uV) 791e79055d6SMark Brown max_uV = value; 792e79055d6SMark Brown } 793e79055d6SMark Brown 794e79055d6SMark Brown /* final: [min_uV..max_uV] valid iff constraints valid */ 795e79055d6SMark Brown if (max_uV < min_uV) { 796e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 797e79055d6SMark Brown __func__, "unsupportable", name); 798e79055d6SMark Brown return -EINVAL; 799e79055d6SMark Brown } 800e79055d6SMark Brown 801e79055d6SMark Brown /* use regulator's subset of machine constraints */ 802e79055d6SMark Brown if (constraints->min_uV < min_uV) { 803e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 804e79055d6SMark Brown __func__, name, "min_uV", 805e79055d6SMark Brown constraints->min_uV, min_uV); 806e79055d6SMark Brown constraints->min_uV = min_uV; 807e79055d6SMark Brown } 808e79055d6SMark Brown if (constraints->max_uV > max_uV) { 809e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 810e79055d6SMark Brown __func__, name, "max_uV", 811e79055d6SMark Brown constraints->max_uV, max_uV); 812e79055d6SMark Brown constraints->max_uV = max_uV; 813e79055d6SMark Brown } 814e79055d6SMark Brown } 815e79055d6SMark Brown 816e79055d6SMark Brown return 0; 817e79055d6SMark Brown } 818e79055d6SMark Brown 819a5766f11SLiam Girdwood /** 820a5766f11SLiam Girdwood * set_machine_constraints - sets regulator constraints 82169279fb9SMark Brown * @rdev: regulator source 822c8e7e464SMark Brown * @constraints: constraints to apply 823a5766f11SLiam Girdwood * 824a5766f11SLiam Girdwood * Allows platform initialisation code to define and constrain 825a5766f11SLiam Girdwood * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 826a5766f11SLiam Girdwood * Constraints *must* be set by platform code in order for some 827a5766f11SLiam Girdwood * regulator operations to proceed i.e. set_voltage, set_current_limit, 828a5766f11SLiam Girdwood * set_mode. 829a5766f11SLiam Girdwood */ 830a5766f11SLiam Girdwood static int set_machine_constraints(struct regulator_dev *rdev, 831a5766f11SLiam Girdwood struct regulation_constraints *constraints) 832a5766f11SLiam Girdwood { 833a5766f11SLiam Girdwood int ret = 0; 834e06f5b4fSMark Brown const char *name; 835e5fda26cSMark Brown struct regulator_ops *ops = rdev->desc->ops; 836e06f5b4fSMark Brown 837af5866c9SMark Brown rdev->constraints = constraints; 838af5866c9SMark Brown 8391083c393SMark Brown name = rdev_get_name(rdev); 8401083c393SMark Brown 8411083c393SMark Brown ret = machine_constraints_voltage(rdev, constraints); 842e79055d6SMark Brown if (ret != 0) 8433e2b9abdSMark Brown goto out; 8443e2b9abdSMark Brown 845a5766f11SLiam Girdwood /* do we need to setup our suspend state */ 846e06f5b4fSMark Brown if (constraints->initial_state) { 847a5766f11SLiam Girdwood ret = suspend_prepare(rdev, constraints->initial_state); 848e06f5b4fSMark Brown if (ret < 0) { 849e06f5b4fSMark Brown printk(KERN_ERR "%s: failed to set suspend state for %s\n", 850e06f5b4fSMark Brown __func__, name); 851e06f5b4fSMark Brown rdev->constraints = NULL; 852e06f5b4fSMark Brown goto out; 853e06f5b4fSMark Brown } 854e06f5b4fSMark Brown } 855a5766f11SLiam Girdwood 856a308466cSMark Brown if (constraints->initial_mode) { 857a308466cSMark Brown if (!ops->set_mode) { 858a308466cSMark Brown printk(KERN_ERR "%s: no set_mode operation for %s\n", 859a308466cSMark Brown __func__, name); 860a308466cSMark Brown ret = -EINVAL; 861a308466cSMark Brown goto out; 862a308466cSMark Brown } 863a308466cSMark Brown 864a308466cSMark Brown ret = ops->set_mode(rdev, constraints->initial_mode); 865a308466cSMark Brown if (ret < 0) { 866a308466cSMark Brown printk(KERN_ERR 867a308466cSMark Brown "%s: failed to set initial mode for %s: %d\n", 868a308466cSMark Brown __func__, name, ret); 869a308466cSMark Brown goto out; 870a308466cSMark Brown } 871a308466cSMark Brown } 872a308466cSMark Brown 873cacf90f2SMark Brown /* If the constraints say the regulator should be on at this point 874cacf90f2SMark Brown * and we have control then make sure it is enabled. 875cacf90f2SMark Brown */ 876cacf90f2SMark Brown if ((constraints->always_on || constraints->boot_on) && ops->enable) { 877e5fda26cSMark Brown ret = ops->enable(rdev); 878e5fda26cSMark Brown if (ret < 0) { 879e5fda26cSMark Brown printk(KERN_ERR "%s: failed to enable %s\n", 880e5fda26cSMark Brown __func__, name); 881e5fda26cSMark Brown rdev->constraints = NULL; 882e5fda26cSMark Brown goto out; 883e5fda26cSMark Brown } 884e5fda26cSMark Brown } 885e5fda26cSMark Brown 886a5766f11SLiam Girdwood print_constraints(rdev); 887a5766f11SLiam Girdwood out: 888a5766f11SLiam Girdwood return ret; 889a5766f11SLiam Girdwood } 890a5766f11SLiam Girdwood 891a5766f11SLiam Girdwood /** 892a5766f11SLiam Girdwood * set_supply - set regulator supply regulator 89369279fb9SMark Brown * @rdev: regulator name 89469279fb9SMark Brown * @supply_rdev: supply regulator name 895a5766f11SLiam Girdwood * 896a5766f11SLiam Girdwood * Called by platform initialisation code to set the supply regulator for this 897a5766f11SLiam Girdwood * regulator. This ensures that a regulators supply will also be enabled by the 898a5766f11SLiam Girdwood * core if it's child is enabled. 899a5766f11SLiam Girdwood */ 900a5766f11SLiam Girdwood static int set_supply(struct regulator_dev *rdev, 901a5766f11SLiam Girdwood struct regulator_dev *supply_rdev) 902a5766f11SLiam Girdwood { 903a5766f11SLiam Girdwood int err; 904a5766f11SLiam Girdwood 905a5766f11SLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 906a5766f11SLiam Girdwood "supply"); 907a5766f11SLiam Girdwood if (err) { 908a5766f11SLiam Girdwood printk(KERN_ERR 909a5766f11SLiam Girdwood "%s: could not add device link %s err %d\n", 910a5766f11SLiam Girdwood __func__, supply_rdev->dev.kobj.name, err); 911a5766f11SLiam Girdwood goto out; 912a5766f11SLiam Girdwood } 913a5766f11SLiam Girdwood rdev->supply = supply_rdev; 914a5766f11SLiam Girdwood list_add(&rdev->slist, &supply_rdev->supply_list); 915a5766f11SLiam Girdwood out: 916a5766f11SLiam Girdwood return err; 917a5766f11SLiam Girdwood } 918a5766f11SLiam Girdwood 919a5766f11SLiam Girdwood /** 92006c63f93SRandy Dunlap * set_consumer_device_supply - Bind a regulator to a symbolic supply 92169279fb9SMark Brown * @rdev: regulator source 92269279fb9SMark Brown * @consumer_dev: device the supply applies to 92340f9244fSMark Brown * @consumer_dev_name: dev_name() string for device supply applies to 924a5766f11SLiam Girdwood * @supply: symbolic name for supply 925a5766f11SLiam Girdwood * 926a5766f11SLiam Girdwood * Allows platform initialisation code to map physical regulator 927a5766f11SLiam Girdwood * sources to symbolic names for supplies for use by devices. Devices 928a5766f11SLiam Girdwood * should use these symbolic names to request regulators, avoiding the 929a5766f11SLiam Girdwood * need to provide board-specific regulator names as platform data. 93040f9244fSMark Brown * 93140f9244fSMark Brown * Only one of consumer_dev and consumer_dev_name may be specified. 932a5766f11SLiam Girdwood */ 933a5766f11SLiam Girdwood static int set_consumer_device_supply(struct regulator_dev *rdev, 93440f9244fSMark Brown struct device *consumer_dev, const char *consumer_dev_name, 93540f9244fSMark Brown const char *supply) 936a5766f11SLiam Girdwood { 937a5766f11SLiam Girdwood struct regulator_map *node; 9389ed2099eSMark Brown int has_dev; 939a5766f11SLiam Girdwood 94040f9244fSMark Brown if (consumer_dev && consumer_dev_name) 94140f9244fSMark Brown return -EINVAL; 94240f9244fSMark Brown 94340f9244fSMark Brown if (!consumer_dev_name && consumer_dev) 94440f9244fSMark Brown consumer_dev_name = dev_name(consumer_dev); 94540f9244fSMark Brown 946a5766f11SLiam Girdwood if (supply == NULL) 947a5766f11SLiam Girdwood return -EINVAL; 948a5766f11SLiam Girdwood 9499ed2099eSMark Brown if (consumer_dev_name != NULL) 9509ed2099eSMark Brown has_dev = 1; 9519ed2099eSMark Brown else 9529ed2099eSMark Brown has_dev = 0; 9539ed2099eSMark Brown 9546001e13cSDavid Brownell list_for_each_entry(node, ®ulator_map_list, list) { 95523b5cc2aSJani Nikula if (node->dev_name && consumer_dev_name) { 95623b5cc2aSJani Nikula if (strcmp(node->dev_name, consumer_dev_name) != 0) 9576001e13cSDavid Brownell continue; 95823b5cc2aSJani Nikula } else if (node->dev_name || consumer_dev_name) { 95923b5cc2aSJani Nikula continue; 96023b5cc2aSJani Nikula } 96123b5cc2aSJani Nikula 9626001e13cSDavid Brownell if (strcmp(node->supply, supply) != 0) 9636001e13cSDavid Brownell continue; 9646001e13cSDavid Brownell 9656001e13cSDavid Brownell dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 9666001e13cSDavid Brownell dev_name(&node->regulator->dev), 9676001e13cSDavid Brownell node->regulator->desc->name, 9686001e13cSDavid Brownell supply, 9691083c393SMark Brown dev_name(&rdev->dev), rdev_get_name(rdev)); 9706001e13cSDavid Brownell return -EBUSY; 9716001e13cSDavid Brownell } 9726001e13cSDavid Brownell 9739ed2099eSMark Brown node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 974a5766f11SLiam Girdwood if (node == NULL) 975a5766f11SLiam Girdwood return -ENOMEM; 976a5766f11SLiam Girdwood 977a5766f11SLiam Girdwood node->regulator = rdev; 978a5766f11SLiam Girdwood node->supply = supply; 979a5766f11SLiam Girdwood 9809ed2099eSMark Brown if (has_dev) { 9819ed2099eSMark Brown node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 98240f9244fSMark Brown if (node->dev_name == NULL) { 98340f9244fSMark Brown kfree(node); 98440f9244fSMark Brown return -ENOMEM; 98540f9244fSMark Brown } 9869ed2099eSMark Brown } 98740f9244fSMark Brown 988a5766f11SLiam Girdwood list_add(&node->list, ®ulator_map_list); 989a5766f11SLiam Girdwood return 0; 990a5766f11SLiam Girdwood } 991a5766f11SLiam Girdwood 9920f1d747bSMike Rapoport static void unset_regulator_supplies(struct regulator_dev *rdev) 9930f1d747bSMike Rapoport { 9940f1d747bSMike Rapoport struct regulator_map *node, *n; 9950f1d747bSMike Rapoport 9960f1d747bSMike Rapoport list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 9970f1d747bSMike Rapoport if (rdev == node->regulator) { 9980f1d747bSMike Rapoport list_del(&node->list); 99940f9244fSMark Brown kfree(node->dev_name); 10000f1d747bSMike Rapoport kfree(node); 10010f1d747bSMike Rapoport } 10020f1d747bSMike Rapoport } 10030f1d747bSMike Rapoport } 10040f1d747bSMike Rapoport 1005414c70cbSLiam Girdwood #define REG_STR_SIZE 32 1006414c70cbSLiam Girdwood 1007414c70cbSLiam Girdwood static struct regulator *create_regulator(struct regulator_dev *rdev, 1008414c70cbSLiam Girdwood struct device *dev, 1009414c70cbSLiam Girdwood const char *supply_name) 1010414c70cbSLiam Girdwood { 1011414c70cbSLiam Girdwood struct regulator *regulator; 1012414c70cbSLiam Girdwood char buf[REG_STR_SIZE]; 1013414c70cbSLiam Girdwood int err, size; 1014414c70cbSLiam Girdwood 1015414c70cbSLiam Girdwood regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1016414c70cbSLiam Girdwood if (regulator == NULL) 1017414c70cbSLiam Girdwood return NULL; 1018414c70cbSLiam Girdwood 1019414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1020414c70cbSLiam Girdwood regulator->rdev = rdev; 1021414c70cbSLiam Girdwood list_add(®ulator->list, &rdev->consumer_list); 1022414c70cbSLiam Girdwood 1023414c70cbSLiam Girdwood if (dev) { 1024414c70cbSLiam Girdwood /* create a 'requested_microamps_name' sysfs entry */ 1025414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1026414c70cbSLiam Girdwood supply_name); 1027414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1028414c70cbSLiam Girdwood goto overflow_err; 1029414c70cbSLiam Girdwood 1030414c70cbSLiam Girdwood regulator->dev = dev; 10314f26a2abSAmeya Palande sysfs_attr_init(®ulator->dev_attr.attr); 1032414c70cbSLiam Girdwood regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1033414c70cbSLiam Girdwood if (regulator->dev_attr.attr.name == NULL) 1034414c70cbSLiam Girdwood goto attr_name_err; 1035414c70cbSLiam Girdwood 1036414c70cbSLiam Girdwood regulator->dev_attr.attr.mode = 0444; 1037414c70cbSLiam Girdwood regulator->dev_attr.show = device_requested_uA_show; 1038414c70cbSLiam Girdwood err = device_create_file(dev, ®ulator->dev_attr); 1039414c70cbSLiam Girdwood if (err < 0) { 1040414c70cbSLiam Girdwood printk(KERN_WARNING "%s: could not add regulator_dev" 1041414c70cbSLiam Girdwood " load sysfs\n", __func__); 1042414c70cbSLiam Girdwood goto attr_name_err; 1043414c70cbSLiam Girdwood } 1044414c70cbSLiam Girdwood 1045414c70cbSLiam Girdwood /* also add a link to the device sysfs entry */ 1046414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1047414c70cbSLiam Girdwood dev->kobj.name, supply_name); 1048414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1049414c70cbSLiam Girdwood goto attr_err; 1050414c70cbSLiam Girdwood 1051414c70cbSLiam Girdwood regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1052414c70cbSLiam Girdwood if (regulator->supply_name == NULL) 1053414c70cbSLiam Girdwood goto attr_err; 1054414c70cbSLiam Girdwood 1055414c70cbSLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1056414c70cbSLiam Girdwood buf); 1057414c70cbSLiam Girdwood if (err) { 1058414c70cbSLiam Girdwood printk(KERN_WARNING 1059414c70cbSLiam Girdwood "%s: could not add device link %s err %d\n", 1060414c70cbSLiam Girdwood __func__, dev->kobj.name, err); 1061414c70cbSLiam Girdwood goto link_name_err; 1062414c70cbSLiam Girdwood } 1063414c70cbSLiam Girdwood } 1064414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1065414c70cbSLiam Girdwood return regulator; 1066414c70cbSLiam Girdwood link_name_err: 1067414c70cbSLiam Girdwood kfree(regulator->supply_name); 1068414c70cbSLiam Girdwood attr_err: 1069414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1070414c70cbSLiam Girdwood attr_name_err: 1071414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1072414c70cbSLiam Girdwood overflow_err: 1073414c70cbSLiam Girdwood list_del(®ulator->list); 1074414c70cbSLiam Girdwood kfree(regulator); 1075414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1076414c70cbSLiam Girdwood return NULL; 1077414c70cbSLiam Girdwood } 1078414c70cbSLiam Girdwood 107931aae2beSMark Brown static int _regulator_get_enable_time(struct regulator_dev *rdev) 108031aae2beSMark Brown { 108131aae2beSMark Brown if (!rdev->desc->ops->enable_time) 108231aae2beSMark Brown return 0; 108331aae2beSMark Brown return rdev->desc->ops->enable_time(rdev); 108431aae2beSMark Brown } 108531aae2beSMark Brown 10865ffbd136SMark Brown /* Internal regulator request function */ 10875ffbd136SMark Brown static struct regulator *_regulator_get(struct device *dev, const char *id, 10885ffbd136SMark Brown int exclusive) 1089414c70cbSLiam Girdwood { 1090414c70cbSLiam Girdwood struct regulator_dev *rdev; 1091414c70cbSLiam Girdwood struct regulator_map *map; 1092414c70cbSLiam Girdwood struct regulator *regulator = ERR_PTR(-ENODEV); 109340f9244fSMark Brown const char *devname = NULL; 10945ffbd136SMark Brown int ret; 1095414c70cbSLiam Girdwood 1096414c70cbSLiam Girdwood if (id == NULL) { 1097414c70cbSLiam Girdwood printk(KERN_ERR "regulator: get() with no identifier\n"); 1098414c70cbSLiam Girdwood return regulator; 1099414c70cbSLiam Girdwood } 1100414c70cbSLiam Girdwood 110140f9244fSMark Brown if (dev) 110240f9244fSMark Brown devname = dev_name(dev); 110340f9244fSMark Brown 1104414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1105414c70cbSLiam Girdwood 1106414c70cbSLiam Girdwood list_for_each_entry(map, ®ulator_map_list, list) { 110740f9244fSMark Brown /* If the mapping has a device set up it must match */ 110840f9244fSMark Brown if (map->dev_name && 110940f9244fSMark Brown (!devname || strcmp(map->dev_name, devname))) 111040f9244fSMark Brown continue; 111140f9244fSMark Brown 111240f9244fSMark Brown if (strcmp(map->supply, id) == 0) { 1113a5766f11SLiam Girdwood rdev = map->regulator; 1114414c70cbSLiam Girdwood goto found; 1115414c70cbSLiam Girdwood } 1116a5766f11SLiam Girdwood } 111734abbd68SMark Brown 1118688fe99aSMark Brown if (board_wants_dummy_regulator) { 1119688fe99aSMark Brown rdev = dummy_regulator_rdev; 1120688fe99aSMark Brown goto found; 1121688fe99aSMark Brown } 1122688fe99aSMark Brown 112334abbd68SMark Brown #ifdef CONFIG_REGULATOR_DUMMY 112434abbd68SMark Brown if (!devname) 112534abbd68SMark Brown devname = "deviceless"; 112634abbd68SMark Brown 112734abbd68SMark Brown /* If the board didn't flag that it was fully constrained then 112834abbd68SMark Brown * substitute in a dummy regulator so consumers can continue. 112934abbd68SMark Brown */ 113034abbd68SMark Brown if (!has_full_constraints) { 113134abbd68SMark Brown pr_warning("%s supply %s not found, using dummy regulator\n", 113234abbd68SMark Brown devname, id); 113334abbd68SMark Brown rdev = dummy_regulator_rdev; 113434abbd68SMark Brown goto found; 113534abbd68SMark Brown } 113634abbd68SMark Brown #endif 113734abbd68SMark Brown 1138414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1139414c70cbSLiam Girdwood return regulator; 1140414c70cbSLiam Girdwood 1141414c70cbSLiam Girdwood found: 11425ffbd136SMark Brown if (rdev->exclusive) { 11435ffbd136SMark Brown regulator = ERR_PTR(-EPERM); 11445ffbd136SMark Brown goto out; 11455ffbd136SMark Brown } 11465ffbd136SMark Brown 11475ffbd136SMark Brown if (exclusive && rdev->open_count) { 11485ffbd136SMark Brown regulator = ERR_PTR(-EBUSY); 11495ffbd136SMark Brown goto out; 11505ffbd136SMark Brown } 11515ffbd136SMark Brown 1152a5766f11SLiam Girdwood if (!try_module_get(rdev->owner)) 1153a5766f11SLiam Girdwood goto out; 1154a5766f11SLiam Girdwood 1155414c70cbSLiam Girdwood regulator = create_regulator(rdev, dev, id); 1156414c70cbSLiam Girdwood if (regulator == NULL) { 1157414c70cbSLiam Girdwood regulator = ERR_PTR(-ENOMEM); 1158414c70cbSLiam Girdwood module_put(rdev->owner); 1159414c70cbSLiam Girdwood } 1160414c70cbSLiam Girdwood 11615ffbd136SMark Brown rdev->open_count++; 11625ffbd136SMark Brown if (exclusive) { 11635ffbd136SMark Brown rdev->exclusive = 1; 11645ffbd136SMark Brown 11655ffbd136SMark Brown ret = _regulator_is_enabled(rdev); 11665ffbd136SMark Brown if (ret > 0) 11675ffbd136SMark Brown rdev->use_count = 1; 11685ffbd136SMark Brown else 11695ffbd136SMark Brown rdev->use_count = 0; 11705ffbd136SMark Brown } 11715ffbd136SMark Brown 1172a5766f11SLiam Girdwood out: 1173414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 11745ffbd136SMark Brown 1175414c70cbSLiam Girdwood return regulator; 1176414c70cbSLiam Girdwood } 11775ffbd136SMark Brown 11785ffbd136SMark Brown /** 11795ffbd136SMark Brown * regulator_get - lookup and obtain a reference to a regulator. 11805ffbd136SMark Brown * @dev: device for regulator "consumer" 11815ffbd136SMark Brown * @id: Supply name or regulator ID. 11825ffbd136SMark Brown * 11835ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 11845ffbd136SMark Brown * or IS_ERR() condition containing errno. 11855ffbd136SMark Brown * 11865ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 11875ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 11885ffbd136SMark Brown * should match the name used for the supply and/or the relevant 11895ffbd136SMark Brown * device pins in the datasheet. 11905ffbd136SMark Brown */ 11915ffbd136SMark Brown struct regulator *regulator_get(struct device *dev, const char *id) 11925ffbd136SMark Brown { 11935ffbd136SMark Brown return _regulator_get(dev, id, 0); 11945ffbd136SMark Brown } 1195414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get); 1196414c70cbSLiam Girdwood 1197414c70cbSLiam Girdwood /** 11985ffbd136SMark Brown * regulator_get_exclusive - obtain exclusive access to a regulator. 11995ffbd136SMark Brown * @dev: device for regulator "consumer" 12005ffbd136SMark Brown * @id: Supply name or regulator ID. 12015ffbd136SMark Brown * 12025ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 12035ffbd136SMark Brown * or IS_ERR() condition containing errno. Other consumers will be 12045ffbd136SMark Brown * unable to obtain this reference is held and the use count for the 12055ffbd136SMark Brown * regulator will be initialised to reflect the current state of the 12065ffbd136SMark Brown * regulator. 12075ffbd136SMark Brown * 12085ffbd136SMark Brown * This is intended for use by consumers which cannot tolerate shared 12095ffbd136SMark Brown * use of the regulator such as those which need to force the 12105ffbd136SMark Brown * regulator off for correct operation of the hardware they are 12115ffbd136SMark Brown * controlling. 12125ffbd136SMark Brown * 12135ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 12145ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 12155ffbd136SMark Brown * should match the name used for the supply and/or the relevant 12165ffbd136SMark Brown * device pins in the datasheet. 12175ffbd136SMark Brown */ 12185ffbd136SMark Brown struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 12195ffbd136SMark Brown { 12205ffbd136SMark Brown return _regulator_get(dev, id, 1); 12215ffbd136SMark Brown } 12225ffbd136SMark Brown EXPORT_SYMBOL_GPL(regulator_get_exclusive); 12235ffbd136SMark Brown 12245ffbd136SMark Brown /** 1225414c70cbSLiam Girdwood * regulator_put - "free" the regulator source 1226414c70cbSLiam Girdwood * @regulator: regulator source 1227414c70cbSLiam Girdwood * 1228414c70cbSLiam Girdwood * Note: drivers must ensure that all regulator_enable calls made on this 1229414c70cbSLiam Girdwood * regulator source are balanced by regulator_disable calls prior to calling 1230414c70cbSLiam Girdwood * this function. 1231414c70cbSLiam Girdwood */ 1232414c70cbSLiam Girdwood void regulator_put(struct regulator *regulator) 1233414c70cbSLiam Girdwood { 1234414c70cbSLiam Girdwood struct regulator_dev *rdev; 1235414c70cbSLiam Girdwood 1236414c70cbSLiam Girdwood if (regulator == NULL || IS_ERR(regulator)) 1237414c70cbSLiam Girdwood return; 1238414c70cbSLiam Girdwood 1239414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1240414c70cbSLiam Girdwood rdev = regulator->rdev; 1241414c70cbSLiam Girdwood 1242414c70cbSLiam Girdwood /* remove any sysfs entries */ 1243414c70cbSLiam Girdwood if (regulator->dev) { 1244414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1245414c70cbSLiam Girdwood kfree(regulator->supply_name); 1246414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1247414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1248414c70cbSLiam Girdwood } 1249414c70cbSLiam Girdwood list_del(®ulator->list); 1250414c70cbSLiam Girdwood kfree(regulator); 1251414c70cbSLiam Girdwood 12525ffbd136SMark Brown rdev->open_count--; 12535ffbd136SMark Brown rdev->exclusive = 0; 12545ffbd136SMark Brown 1255414c70cbSLiam Girdwood module_put(rdev->owner); 1256414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1257414c70cbSLiam Girdwood } 1258414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_put); 1259414c70cbSLiam Girdwood 12609a2372faSMark Brown static int _regulator_can_change_status(struct regulator_dev *rdev) 12619a2372faSMark Brown { 12629a2372faSMark Brown if (!rdev->constraints) 12639a2372faSMark Brown return 0; 12649a2372faSMark Brown 12659a2372faSMark Brown if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 12669a2372faSMark Brown return 1; 12679a2372faSMark Brown else 12689a2372faSMark Brown return 0; 12699a2372faSMark Brown } 12709a2372faSMark Brown 1271414c70cbSLiam Girdwood /* locks held by regulator_enable() */ 1272414c70cbSLiam Girdwood static int _regulator_enable(struct regulator_dev *rdev) 1273414c70cbSLiam Girdwood { 127431aae2beSMark Brown int ret, delay; 1275414c70cbSLiam Girdwood 1276acaf6ffeSBengt Jonsson if (rdev->use_count == 0) { 1277414c70cbSLiam Girdwood /* do we need to enable the supply regulator first */ 1278414c70cbSLiam Girdwood if (rdev->supply) { 12793aa713e7SMattias Wallin mutex_lock(&rdev->supply->mutex); 1280414c70cbSLiam Girdwood ret = _regulator_enable(rdev->supply); 12813aa713e7SMattias Wallin mutex_unlock(&rdev->supply->mutex); 1282414c70cbSLiam Girdwood if (ret < 0) { 1283414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enable %s: %d\n", 12841083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1285414c70cbSLiam Girdwood return ret; 1286414c70cbSLiam Girdwood } 1287414c70cbSLiam Girdwood } 1288acaf6ffeSBengt Jonsson } 1289414c70cbSLiam Girdwood 1290414c70cbSLiam Girdwood /* check voltage and requested load before enabling */ 1291414c70cbSLiam Girdwood if (rdev->constraints && 12929a2372faSMark Brown (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1293414c70cbSLiam Girdwood drms_uA_update(rdev); 1294414c70cbSLiam Girdwood 12959a2372faSMark Brown if (rdev->use_count == 0) { 12969a2372faSMark Brown /* The regulator may on if it's not switchable or left on */ 12979a2372faSMark Brown ret = _regulator_is_enabled(rdev); 12989a2372faSMark Brown if (ret == -EINVAL || ret == 0) { 12999a2372faSMark Brown if (!_regulator_can_change_status(rdev)) 13009a2372faSMark Brown return -EPERM; 13019a2372faSMark Brown 130231aae2beSMark Brown if (!rdev->desc->ops->enable) 130331aae2beSMark Brown return -EINVAL; 130431aae2beSMark Brown 130531aae2beSMark Brown /* Query before enabling in case configuration 130631aae2beSMark Brown * dependant. */ 130731aae2beSMark Brown ret = _regulator_get_enable_time(rdev); 130831aae2beSMark Brown if (ret >= 0) { 130931aae2beSMark Brown delay = ret; 131031aae2beSMark Brown } else { 131131aae2beSMark Brown printk(KERN_WARNING 131231aae2beSMark Brown "%s: enable_time() failed for %s: %d\n", 131331aae2beSMark Brown __func__, rdev_get_name(rdev), 131431aae2beSMark Brown ret); 131531aae2beSMark Brown delay = 0; 131631aae2beSMark Brown } 131731aae2beSMark Brown 131802fa3ec0SMark Brown trace_regulator_enable(rdev_get_name(rdev)); 131902fa3ec0SMark Brown 132031aae2beSMark Brown /* Allow the regulator to ramp; it would be useful 132131aae2beSMark Brown * to extend this for bulk operations so that the 132231aae2beSMark Brown * regulators can ramp together. */ 1323414c70cbSLiam Girdwood ret = rdev->desc->ops->enable(rdev); 13249a2372faSMark Brown if (ret < 0) 13259a2372faSMark Brown return ret; 132631aae2beSMark Brown 132702fa3ec0SMark Brown trace_regulator_enable_delay(rdev_get_name(rdev)); 132802fa3ec0SMark Brown 1329e36c1df8SAxel Lin if (delay >= 1000) { 133031aae2beSMark Brown mdelay(delay / 1000); 1331e36c1df8SAxel Lin udelay(delay % 1000); 1332e36c1df8SAxel Lin } else if (delay) { 133331aae2beSMark Brown udelay(delay); 1334e36c1df8SAxel Lin } 133531aae2beSMark Brown 133602fa3ec0SMark Brown trace_regulator_enable_complete(rdev_get_name(rdev)); 133702fa3ec0SMark Brown 1338a7433cffSLinus Walleij } else if (ret < 0) { 13399a2372faSMark Brown printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", 13401083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1341414c70cbSLiam Girdwood return ret; 1342414c70cbSLiam Girdwood } 1343a7433cffSLinus Walleij /* Fallthrough on positive return values - already enabled */ 1344414c70cbSLiam Girdwood } 1345414c70cbSLiam Girdwood 13469a2372faSMark Brown rdev->use_count++; 13479a2372faSMark Brown 13489a2372faSMark Brown return 0; 1349414c70cbSLiam Girdwood } 1350414c70cbSLiam Girdwood 1351414c70cbSLiam Girdwood /** 1352414c70cbSLiam Girdwood * regulator_enable - enable regulator output 1353414c70cbSLiam Girdwood * @regulator: regulator source 1354414c70cbSLiam Girdwood * 1355cf7bbcdfSMark Brown * Request that the regulator be enabled with the regulator output at 1356cf7bbcdfSMark Brown * the predefined voltage or current value. Calls to regulator_enable() 1357cf7bbcdfSMark Brown * must be balanced with calls to regulator_disable(). 1358cf7bbcdfSMark Brown * 1359414c70cbSLiam Girdwood * NOTE: the output value can be set by other drivers, boot loader or may be 1360cf7bbcdfSMark Brown * hardwired in the regulator. 1361414c70cbSLiam Girdwood */ 1362414c70cbSLiam Girdwood int regulator_enable(struct regulator *regulator) 1363414c70cbSLiam Girdwood { 1364412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1365412aec61SDavid Brownell int ret = 0; 1366414c70cbSLiam Girdwood 1367412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1368412aec61SDavid Brownell ret = _regulator_enable(rdev); 1369412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 1370414c70cbSLiam Girdwood return ret; 1371414c70cbSLiam Girdwood } 1372414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_enable); 1373414c70cbSLiam Girdwood 1374414c70cbSLiam Girdwood /* locks held by regulator_disable() */ 13758cbf811dSJeffrey Carlyle static int _regulator_disable(struct regulator_dev *rdev, 13768cbf811dSJeffrey Carlyle struct regulator_dev **supply_rdev_ptr) 1377414c70cbSLiam Girdwood { 1378414c70cbSLiam Girdwood int ret = 0; 1379b12a1e29SMattias Wallin *supply_rdev_ptr = NULL; 1380414c70cbSLiam Girdwood 1381cd94b505SDavid Brownell if (WARN(rdev->use_count <= 0, 1382cd94b505SDavid Brownell "unbalanced disables for %s\n", 13831083c393SMark Brown rdev_get_name(rdev))) 1384cd94b505SDavid Brownell return -EIO; 1385cd94b505SDavid Brownell 1386414c70cbSLiam Girdwood /* are we the last user and permitted to disable ? */ 138760ef66fcSMark Brown if (rdev->use_count == 1 && 138860ef66fcSMark Brown (rdev->constraints && !rdev->constraints->always_on)) { 1389414c70cbSLiam Girdwood 1390414c70cbSLiam Girdwood /* we are last user */ 13919a2372faSMark Brown if (_regulator_can_change_status(rdev) && 13929a2372faSMark Brown rdev->desc->ops->disable) { 139302fa3ec0SMark Brown trace_regulator_disable(rdev_get_name(rdev)); 139402fa3ec0SMark Brown 1395414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1396414c70cbSLiam Girdwood if (ret < 0) { 1397414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to disable %s\n", 13981083c393SMark Brown __func__, rdev_get_name(rdev)); 1399414c70cbSLiam Girdwood return ret; 1400414c70cbSLiam Girdwood } 140184b68263SMark Brown 140202fa3ec0SMark Brown trace_regulator_disable_complete(rdev_get_name(rdev)); 140302fa3ec0SMark Brown 140484b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 140584b68263SMark Brown NULL); 1406414c70cbSLiam Girdwood } 1407414c70cbSLiam Girdwood 1408414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 14098cbf811dSJeffrey Carlyle *supply_rdev_ptr = rdev->supply; 1410414c70cbSLiam Girdwood 1411414c70cbSLiam Girdwood rdev->use_count = 0; 1412414c70cbSLiam Girdwood } else if (rdev->use_count > 1) { 1413414c70cbSLiam Girdwood 1414414c70cbSLiam Girdwood if (rdev->constraints && 1415414c70cbSLiam Girdwood (rdev->constraints->valid_ops_mask & 1416414c70cbSLiam Girdwood REGULATOR_CHANGE_DRMS)) 1417414c70cbSLiam Girdwood drms_uA_update(rdev); 1418414c70cbSLiam Girdwood 1419414c70cbSLiam Girdwood rdev->use_count--; 1420414c70cbSLiam Girdwood } 1421414c70cbSLiam Girdwood return ret; 1422414c70cbSLiam Girdwood } 1423414c70cbSLiam Girdwood 1424414c70cbSLiam Girdwood /** 1425414c70cbSLiam Girdwood * regulator_disable - disable regulator output 1426414c70cbSLiam Girdwood * @regulator: regulator source 1427414c70cbSLiam Girdwood * 1428cf7bbcdfSMark Brown * Disable the regulator output voltage or current. Calls to 1429cf7bbcdfSMark Brown * regulator_enable() must be balanced with calls to 1430cf7bbcdfSMark Brown * regulator_disable(). 143169279fb9SMark Brown * 1432414c70cbSLiam Girdwood * NOTE: this will only disable the regulator output if no other consumer 1433cf7bbcdfSMark Brown * devices have it enabled, the regulator device supports disabling and 1434cf7bbcdfSMark Brown * machine constraints permit this operation. 1435414c70cbSLiam Girdwood */ 1436414c70cbSLiam Girdwood int regulator_disable(struct regulator *regulator) 1437414c70cbSLiam Girdwood { 1438412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 14398cbf811dSJeffrey Carlyle struct regulator_dev *supply_rdev = NULL; 1440412aec61SDavid Brownell int ret = 0; 1441414c70cbSLiam Girdwood 1442412aec61SDavid Brownell mutex_lock(&rdev->mutex); 14438cbf811dSJeffrey Carlyle ret = _regulator_disable(rdev, &supply_rdev); 1444412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 14458cbf811dSJeffrey Carlyle 14468cbf811dSJeffrey Carlyle /* decrease our supplies ref count and disable if required */ 14478cbf811dSJeffrey Carlyle while (supply_rdev != NULL) { 14488cbf811dSJeffrey Carlyle rdev = supply_rdev; 14498cbf811dSJeffrey Carlyle 14508cbf811dSJeffrey Carlyle mutex_lock(&rdev->mutex); 14518cbf811dSJeffrey Carlyle _regulator_disable(rdev, &supply_rdev); 14528cbf811dSJeffrey Carlyle mutex_unlock(&rdev->mutex); 14538cbf811dSJeffrey Carlyle } 14548cbf811dSJeffrey Carlyle 1455414c70cbSLiam Girdwood return ret; 1456414c70cbSLiam Girdwood } 1457414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_disable); 1458414c70cbSLiam Girdwood 1459414c70cbSLiam Girdwood /* locks held by regulator_force_disable() */ 14608cbf811dSJeffrey Carlyle static int _regulator_force_disable(struct regulator_dev *rdev, 14618cbf811dSJeffrey Carlyle struct regulator_dev **supply_rdev_ptr) 1462414c70cbSLiam Girdwood { 1463414c70cbSLiam Girdwood int ret = 0; 1464414c70cbSLiam Girdwood 1465414c70cbSLiam Girdwood /* force disable */ 1466414c70cbSLiam Girdwood if (rdev->desc->ops->disable) { 1467414c70cbSLiam Girdwood /* ah well, who wants to live forever... */ 1468414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1469414c70cbSLiam Girdwood if (ret < 0) { 1470414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to force disable %s\n", 14711083c393SMark Brown __func__, rdev_get_name(rdev)); 1472414c70cbSLiam Girdwood return ret; 1473414c70cbSLiam Girdwood } 1474414c70cbSLiam Girdwood /* notify other consumers that power has been forced off */ 147584b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 147684b68263SMark Brown REGULATOR_EVENT_DISABLE, NULL); 1477414c70cbSLiam Girdwood } 1478414c70cbSLiam Girdwood 1479414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 14808cbf811dSJeffrey Carlyle *supply_rdev_ptr = rdev->supply; 1481414c70cbSLiam Girdwood 1482414c70cbSLiam Girdwood rdev->use_count = 0; 1483414c70cbSLiam Girdwood return ret; 1484414c70cbSLiam Girdwood } 1485414c70cbSLiam Girdwood 1486414c70cbSLiam Girdwood /** 1487414c70cbSLiam Girdwood * regulator_force_disable - force disable regulator output 1488414c70cbSLiam Girdwood * @regulator: regulator source 1489414c70cbSLiam Girdwood * 1490414c70cbSLiam Girdwood * Forcibly disable the regulator output voltage or current. 1491414c70cbSLiam Girdwood * NOTE: this *will* disable the regulator output even if other consumer 1492414c70cbSLiam Girdwood * devices have it enabled. This should be used for situations when device 1493414c70cbSLiam Girdwood * damage will likely occur if the regulator is not disabled (e.g. over temp). 1494414c70cbSLiam Girdwood */ 1495414c70cbSLiam Girdwood int regulator_force_disable(struct regulator *regulator) 1496414c70cbSLiam Girdwood { 14978cbf811dSJeffrey Carlyle struct regulator_dev *supply_rdev = NULL; 1498414c70cbSLiam Girdwood int ret; 1499414c70cbSLiam Girdwood 1500414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1501414c70cbSLiam Girdwood regulator->uA_load = 0; 15028cbf811dSJeffrey Carlyle ret = _regulator_force_disable(regulator->rdev, &supply_rdev); 1503414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 15048cbf811dSJeffrey Carlyle 15058cbf811dSJeffrey Carlyle if (supply_rdev) 15068cbf811dSJeffrey Carlyle regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); 15078cbf811dSJeffrey Carlyle 1508414c70cbSLiam Girdwood return ret; 1509414c70cbSLiam Girdwood } 1510414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_force_disable); 1511414c70cbSLiam Girdwood 1512414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev) 1513414c70cbSLiam Girdwood { 15149a7f6a4cSMark Brown /* If we don't know then assume that the regulator is always on */ 15159332546fSMark Brown if (!rdev->desc->ops->is_enabled) 15169a7f6a4cSMark Brown return 1; 1517414c70cbSLiam Girdwood 15189332546fSMark Brown return rdev->desc->ops->is_enabled(rdev); 1519414c70cbSLiam Girdwood } 1520414c70cbSLiam Girdwood 1521414c70cbSLiam Girdwood /** 1522414c70cbSLiam Girdwood * regulator_is_enabled - is the regulator output enabled 1523414c70cbSLiam Girdwood * @regulator: regulator source 1524414c70cbSLiam Girdwood * 1525412aec61SDavid Brownell * Returns positive if the regulator driver backing the source/client 1526412aec61SDavid Brownell * has requested that the device be enabled, zero if it hasn't, else a 1527412aec61SDavid Brownell * negative errno code. 1528412aec61SDavid Brownell * 1529412aec61SDavid Brownell * Note that the device backing this regulator handle can have multiple 1530412aec61SDavid Brownell * users, so it might be enabled even if regulator_enable() was never 1531412aec61SDavid Brownell * called for this particular source. 1532414c70cbSLiam Girdwood */ 1533414c70cbSLiam Girdwood int regulator_is_enabled(struct regulator *regulator) 1534414c70cbSLiam Girdwood { 15359332546fSMark Brown int ret; 15369332546fSMark Brown 15379332546fSMark Brown mutex_lock(®ulator->rdev->mutex); 15389332546fSMark Brown ret = _regulator_is_enabled(regulator->rdev); 15399332546fSMark Brown mutex_unlock(®ulator->rdev->mutex); 15409332546fSMark Brown 15419332546fSMark Brown return ret; 1542414c70cbSLiam Girdwood } 1543414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_is_enabled); 1544414c70cbSLiam Girdwood 1545414c70cbSLiam Girdwood /** 15464367cfdcSDavid Brownell * regulator_count_voltages - count regulator_list_voltage() selectors 15474367cfdcSDavid Brownell * @regulator: regulator source 15484367cfdcSDavid Brownell * 15494367cfdcSDavid Brownell * Returns number of selectors, or negative errno. Selectors are 15504367cfdcSDavid Brownell * numbered starting at zero, and typically correspond to bitfields 15514367cfdcSDavid Brownell * in hardware registers. 15524367cfdcSDavid Brownell */ 15534367cfdcSDavid Brownell int regulator_count_voltages(struct regulator *regulator) 15544367cfdcSDavid Brownell { 15554367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15564367cfdcSDavid Brownell 15574367cfdcSDavid Brownell return rdev->desc->n_voltages ? : -EINVAL; 15584367cfdcSDavid Brownell } 15594367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_count_voltages); 15604367cfdcSDavid Brownell 15614367cfdcSDavid Brownell /** 15624367cfdcSDavid Brownell * regulator_list_voltage - enumerate supported voltages 15634367cfdcSDavid Brownell * @regulator: regulator source 15644367cfdcSDavid Brownell * @selector: identify voltage to list 15654367cfdcSDavid Brownell * Context: can sleep 15664367cfdcSDavid Brownell * 15674367cfdcSDavid Brownell * Returns a voltage that can be passed to @regulator_set_voltage(), 156888393161SThomas Weber * zero if this selector code can't be used on this system, or a 15694367cfdcSDavid Brownell * negative errno. 15704367cfdcSDavid Brownell */ 15714367cfdcSDavid Brownell int regulator_list_voltage(struct regulator *regulator, unsigned selector) 15724367cfdcSDavid Brownell { 15734367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15744367cfdcSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 15754367cfdcSDavid Brownell int ret; 15764367cfdcSDavid Brownell 15774367cfdcSDavid Brownell if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 15784367cfdcSDavid Brownell return -EINVAL; 15794367cfdcSDavid Brownell 15804367cfdcSDavid Brownell mutex_lock(&rdev->mutex); 15814367cfdcSDavid Brownell ret = ops->list_voltage(rdev, selector); 15824367cfdcSDavid Brownell mutex_unlock(&rdev->mutex); 15834367cfdcSDavid Brownell 15844367cfdcSDavid Brownell if (ret > 0) { 15854367cfdcSDavid Brownell if (ret < rdev->constraints->min_uV) 15864367cfdcSDavid Brownell ret = 0; 15874367cfdcSDavid Brownell else if (ret > rdev->constraints->max_uV) 15884367cfdcSDavid Brownell ret = 0; 15894367cfdcSDavid Brownell } 15904367cfdcSDavid Brownell 15914367cfdcSDavid Brownell return ret; 15924367cfdcSDavid Brownell } 15934367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_list_voltage); 15944367cfdcSDavid Brownell 15954367cfdcSDavid Brownell /** 1596a7a1ad90SMark Brown * regulator_is_supported_voltage - check if a voltage range can be supported 1597a7a1ad90SMark Brown * 1598a7a1ad90SMark Brown * @regulator: Regulator to check. 1599a7a1ad90SMark Brown * @min_uV: Minimum required voltage in uV. 1600a7a1ad90SMark Brown * @max_uV: Maximum required voltage in uV. 1601a7a1ad90SMark Brown * 1602a7a1ad90SMark Brown * Returns a boolean or a negative error code. 1603a7a1ad90SMark Brown */ 1604a7a1ad90SMark Brown int regulator_is_supported_voltage(struct regulator *regulator, 1605a7a1ad90SMark Brown int min_uV, int max_uV) 1606a7a1ad90SMark Brown { 1607a7a1ad90SMark Brown int i, voltages, ret; 1608a7a1ad90SMark Brown 1609a7a1ad90SMark Brown ret = regulator_count_voltages(regulator); 1610a7a1ad90SMark Brown if (ret < 0) 1611a7a1ad90SMark Brown return ret; 1612a7a1ad90SMark Brown voltages = ret; 1613a7a1ad90SMark Brown 1614a7a1ad90SMark Brown for (i = 0; i < voltages; i++) { 1615a7a1ad90SMark Brown ret = regulator_list_voltage(regulator, i); 1616a7a1ad90SMark Brown 1617a7a1ad90SMark Brown if (ret >= min_uV && ret <= max_uV) 1618a7a1ad90SMark Brown return 1; 1619a7a1ad90SMark Brown } 1620a7a1ad90SMark Brown 1621a7a1ad90SMark Brown return 0; 1622a7a1ad90SMark Brown } 1623a7a1ad90SMark Brown 1624a7a1ad90SMark Brown /** 1625414c70cbSLiam Girdwood * regulator_set_voltage - set regulator output voltage 1626414c70cbSLiam Girdwood * @regulator: regulator source 1627414c70cbSLiam Girdwood * @min_uV: Minimum required voltage in uV 1628414c70cbSLiam Girdwood * @max_uV: Maximum acceptable voltage in uV 1629414c70cbSLiam Girdwood * 1630414c70cbSLiam Girdwood * Sets a voltage regulator to the desired output voltage. This can be set 1631414c70cbSLiam Girdwood * during any regulator state. IOW, regulator can be disabled or enabled. 1632414c70cbSLiam Girdwood * 1633414c70cbSLiam Girdwood * If the regulator is enabled then the voltage will change to the new value 1634414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1635414c70cbSLiam Girdwood * output at the new voltage when enabled. 1636414c70cbSLiam Girdwood * 1637414c70cbSLiam Girdwood * NOTE: If the regulator is shared between several devices then the lowest 1638414c70cbSLiam Girdwood * request voltage that meets the system constraints will be used. 163969279fb9SMark Brown * Regulator system constraints must be set for this regulator before 1640414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1641414c70cbSLiam Girdwood */ 1642414c70cbSLiam Girdwood int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1643414c70cbSLiam Girdwood { 1644414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1645414c70cbSLiam Girdwood int ret; 16463a93f2a9SMark Brown unsigned selector; 1647414c70cbSLiam Girdwood 1648414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1649414c70cbSLiam Girdwood 1650414c70cbSLiam Girdwood /* sanity check */ 1651414c70cbSLiam Girdwood if (!rdev->desc->ops->set_voltage) { 1652414c70cbSLiam Girdwood ret = -EINVAL; 1653414c70cbSLiam Girdwood goto out; 1654414c70cbSLiam Girdwood } 1655414c70cbSLiam Girdwood 1656414c70cbSLiam Girdwood /* constraints check */ 1657414c70cbSLiam Girdwood ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1658414c70cbSLiam Girdwood if (ret < 0) 1659414c70cbSLiam Girdwood goto out; 1660414c70cbSLiam Girdwood regulator->min_uV = min_uV; 1661414c70cbSLiam Girdwood regulator->max_uV = max_uV; 16623a93f2a9SMark Brown 166302fa3ec0SMark Brown trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV); 166402fa3ec0SMark Brown 16653a93f2a9SMark Brown ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, &selector); 16663a93f2a9SMark Brown 16673a93f2a9SMark Brown if (rdev->desc->ops->list_voltage) 16683a93f2a9SMark Brown selector = rdev->desc->ops->list_voltage(rdev, selector); 16693a93f2a9SMark Brown else 16703a93f2a9SMark Brown selector = -1; 1671414c70cbSLiam Girdwood 167202fa3ec0SMark Brown trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector); 167302fa3ec0SMark Brown 1674414c70cbSLiam Girdwood out: 1675b136fb44SJonathan Cameron _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1676414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1677414c70cbSLiam Girdwood return ret; 1678414c70cbSLiam Girdwood } 1679414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_voltage); 1680414c70cbSLiam Girdwood 1681414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev) 1682414c70cbSLiam Girdwood { 1683414c70cbSLiam Girdwood /* sanity check */ 1684414c70cbSLiam Girdwood if (rdev->desc->ops->get_voltage) 1685414c70cbSLiam Girdwood return rdev->desc->ops->get_voltage(rdev); 1686414c70cbSLiam Girdwood else 1687414c70cbSLiam Girdwood return -EINVAL; 1688414c70cbSLiam Girdwood } 1689414c70cbSLiam Girdwood 1690414c70cbSLiam Girdwood /** 1691414c70cbSLiam Girdwood * regulator_get_voltage - get regulator output voltage 1692414c70cbSLiam Girdwood * @regulator: regulator source 1693414c70cbSLiam Girdwood * 1694414c70cbSLiam Girdwood * This returns the current regulator voltage in uV. 1695414c70cbSLiam Girdwood * 1696414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the voltage value. This 1697414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1698414c70cbSLiam Girdwood */ 1699414c70cbSLiam Girdwood int regulator_get_voltage(struct regulator *regulator) 1700414c70cbSLiam Girdwood { 1701414c70cbSLiam Girdwood int ret; 1702414c70cbSLiam Girdwood 1703414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1704414c70cbSLiam Girdwood 1705414c70cbSLiam Girdwood ret = _regulator_get_voltage(regulator->rdev); 1706414c70cbSLiam Girdwood 1707414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 1708414c70cbSLiam Girdwood 1709414c70cbSLiam Girdwood return ret; 1710414c70cbSLiam Girdwood } 1711414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_voltage); 1712414c70cbSLiam Girdwood 1713414c70cbSLiam Girdwood /** 1714414c70cbSLiam Girdwood * regulator_set_current_limit - set regulator output current limit 1715414c70cbSLiam Girdwood * @regulator: regulator source 1716414c70cbSLiam Girdwood * @min_uA: Minimuum supported current in uA 1717414c70cbSLiam Girdwood * @max_uA: Maximum supported current in uA 1718414c70cbSLiam Girdwood * 1719414c70cbSLiam Girdwood * Sets current sink to the desired output current. This can be set during 1720414c70cbSLiam Girdwood * any regulator state. IOW, regulator can be disabled or enabled. 1721414c70cbSLiam Girdwood * 1722414c70cbSLiam Girdwood * If the regulator is enabled then the current will change to the new value 1723414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1724414c70cbSLiam Girdwood * output at the new current when enabled. 1725414c70cbSLiam Girdwood * 1726414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1727414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1728414c70cbSLiam Girdwood */ 1729414c70cbSLiam Girdwood int regulator_set_current_limit(struct regulator *regulator, 1730414c70cbSLiam Girdwood int min_uA, int max_uA) 1731414c70cbSLiam Girdwood { 1732414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1733414c70cbSLiam Girdwood int ret; 1734414c70cbSLiam Girdwood 1735414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1736414c70cbSLiam Girdwood 1737414c70cbSLiam Girdwood /* sanity check */ 1738414c70cbSLiam Girdwood if (!rdev->desc->ops->set_current_limit) { 1739414c70cbSLiam Girdwood ret = -EINVAL; 1740414c70cbSLiam Girdwood goto out; 1741414c70cbSLiam Girdwood } 1742414c70cbSLiam Girdwood 1743414c70cbSLiam Girdwood /* constraints check */ 1744414c70cbSLiam Girdwood ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1745414c70cbSLiam Girdwood if (ret < 0) 1746414c70cbSLiam Girdwood goto out; 1747414c70cbSLiam Girdwood 1748414c70cbSLiam Girdwood ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1749414c70cbSLiam Girdwood out: 1750414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1751414c70cbSLiam Girdwood return ret; 1752414c70cbSLiam Girdwood } 1753414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1754414c70cbSLiam Girdwood 1755414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev) 1756414c70cbSLiam Girdwood { 1757414c70cbSLiam Girdwood int ret; 1758414c70cbSLiam Girdwood 1759414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1760414c70cbSLiam Girdwood 1761414c70cbSLiam Girdwood /* sanity check */ 1762414c70cbSLiam Girdwood if (!rdev->desc->ops->get_current_limit) { 1763414c70cbSLiam Girdwood ret = -EINVAL; 1764414c70cbSLiam Girdwood goto out; 1765414c70cbSLiam Girdwood } 1766414c70cbSLiam Girdwood 1767414c70cbSLiam Girdwood ret = rdev->desc->ops->get_current_limit(rdev); 1768414c70cbSLiam Girdwood out: 1769414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1770414c70cbSLiam Girdwood return ret; 1771414c70cbSLiam Girdwood } 1772414c70cbSLiam Girdwood 1773414c70cbSLiam Girdwood /** 1774414c70cbSLiam Girdwood * regulator_get_current_limit - get regulator output current 1775414c70cbSLiam Girdwood * @regulator: regulator source 1776414c70cbSLiam Girdwood * 1777414c70cbSLiam Girdwood * This returns the current supplied by the specified current sink in uA. 1778414c70cbSLiam Girdwood * 1779414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the current value. This 1780414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1781414c70cbSLiam Girdwood */ 1782414c70cbSLiam Girdwood int regulator_get_current_limit(struct regulator *regulator) 1783414c70cbSLiam Girdwood { 1784414c70cbSLiam Girdwood return _regulator_get_current_limit(regulator->rdev); 1785414c70cbSLiam Girdwood } 1786414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1787414c70cbSLiam Girdwood 1788414c70cbSLiam Girdwood /** 1789414c70cbSLiam Girdwood * regulator_set_mode - set regulator operating mode 1790414c70cbSLiam Girdwood * @regulator: regulator source 1791414c70cbSLiam Girdwood * @mode: operating mode - one of the REGULATOR_MODE constants 1792414c70cbSLiam Girdwood * 1793414c70cbSLiam Girdwood * Set regulator operating mode to increase regulator efficiency or improve 1794414c70cbSLiam Girdwood * regulation performance. 1795414c70cbSLiam Girdwood * 1796414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1797414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1798414c70cbSLiam Girdwood */ 1799414c70cbSLiam Girdwood int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1800414c70cbSLiam Girdwood { 1801414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1802414c70cbSLiam Girdwood int ret; 1803500b4ac9SSundar R Iyer int regulator_curr_mode; 1804414c70cbSLiam Girdwood 1805414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1806414c70cbSLiam Girdwood 1807414c70cbSLiam Girdwood /* sanity check */ 1808414c70cbSLiam Girdwood if (!rdev->desc->ops->set_mode) { 1809414c70cbSLiam Girdwood ret = -EINVAL; 1810414c70cbSLiam Girdwood goto out; 1811414c70cbSLiam Girdwood } 1812414c70cbSLiam Girdwood 1813500b4ac9SSundar R Iyer /* return if the same mode is requested */ 1814500b4ac9SSundar R Iyer if (rdev->desc->ops->get_mode) { 1815500b4ac9SSundar R Iyer regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1816500b4ac9SSundar R Iyer if (regulator_curr_mode == mode) { 1817500b4ac9SSundar R Iyer ret = 0; 1818500b4ac9SSundar R Iyer goto out; 1819500b4ac9SSundar R Iyer } 1820500b4ac9SSundar R Iyer } 1821500b4ac9SSundar R Iyer 1822414c70cbSLiam Girdwood /* constraints check */ 1823414c70cbSLiam Girdwood ret = regulator_check_mode(rdev, mode); 1824414c70cbSLiam Girdwood if (ret < 0) 1825414c70cbSLiam Girdwood goto out; 1826414c70cbSLiam Girdwood 1827414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1828414c70cbSLiam Girdwood out: 1829414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1830414c70cbSLiam Girdwood return ret; 1831414c70cbSLiam Girdwood } 1832414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_mode); 1833414c70cbSLiam Girdwood 1834414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1835414c70cbSLiam Girdwood { 1836414c70cbSLiam Girdwood int ret; 1837414c70cbSLiam Girdwood 1838414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1839414c70cbSLiam Girdwood 1840414c70cbSLiam Girdwood /* sanity check */ 1841414c70cbSLiam Girdwood if (!rdev->desc->ops->get_mode) { 1842414c70cbSLiam Girdwood ret = -EINVAL; 1843414c70cbSLiam Girdwood goto out; 1844414c70cbSLiam Girdwood } 1845414c70cbSLiam Girdwood 1846414c70cbSLiam Girdwood ret = rdev->desc->ops->get_mode(rdev); 1847414c70cbSLiam Girdwood out: 1848414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1849414c70cbSLiam Girdwood return ret; 1850414c70cbSLiam Girdwood } 1851414c70cbSLiam Girdwood 1852414c70cbSLiam Girdwood /** 1853414c70cbSLiam Girdwood * regulator_get_mode - get regulator operating mode 1854414c70cbSLiam Girdwood * @regulator: regulator source 1855414c70cbSLiam Girdwood * 1856414c70cbSLiam Girdwood * Get the current regulator operating mode. 1857414c70cbSLiam Girdwood */ 1858414c70cbSLiam Girdwood unsigned int regulator_get_mode(struct regulator *regulator) 1859414c70cbSLiam Girdwood { 1860414c70cbSLiam Girdwood return _regulator_get_mode(regulator->rdev); 1861414c70cbSLiam Girdwood } 1862414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_mode); 1863414c70cbSLiam Girdwood 1864414c70cbSLiam Girdwood /** 1865414c70cbSLiam Girdwood * regulator_set_optimum_mode - set regulator optimum operating mode 1866414c70cbSLiam Girdwood * @regulator: regulator source 1867414c70cbSLiam Girdwood * @uA_load: load current 1868414c70cbSLiam Girdwood * 1869414c70cbSLiam Girdwood * Notifies the regulator core of a new device load. This is then used by 1870414c70cbSLiam Girdwood * DRMS (if enabled by constraints) to set the most efficient regulator 1871414c70cbSLiam Girdwood * operating mode for the new regulator loading. 1872414c70cbSLiam Girdwood * 1873414c70cbSLiam Girdwood * Consumer devices notify their supply regulator of the maximum power 1874414c70cbSLiam Girdwood * they will require (can be taken from device datasheet in the power 1875414c70cbSLiam Girdwood * consumption tables) when they change operational status and hence power 1876414c70cbSLiam Girdwood * state. Examples of operational state changes that can affect power 1877414c70cbSLiam Girdwood * consumption are :- 1878414c70cbSLiam Girdwood * 1879414c70cbSLiam Girdwood * o Device is opened / closed. 1880414c70cbSLiam Girdwood * o Device I/O is about to begin or has just finished. 1881414c70cbSLiam Girdwood * o Device is idling in between work. 1882414c70cbSLiam Girdwood * 1883414c70cbSLiam Girdwood * This information is also exported via sysfs to userspace. 1884414c70cbSLiam Girdwood * 1885414c70cbSLiam Girdwood * DRMS will sum the total requested load on the regulator and change 1886414c70cbSLiam Girdwood * to the most efficient operating mode if platform constraints allow. 1887414c70cbSLiam Girdwood * 1888414c70cbSLiam Girdwood * Returns the new regulator mode or error. 1889414c70cbSLiam Girdwood */ 1890414c70cbSLiam Girdwood int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1891414c70cbSLiam Girdwood { 1892414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1893414c70cbSLiam Girdwood struct regulator *consumer; 1894414c70cbSLiam Girdwood int ret, output_uV, input_uV, total_uA_load = 0; 1895414c70cbSLiam Girdwood unsigned int mode; 1896414c70cbSLiam Girdwood 1897414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1898414c70cbSLiam Girdwood 1899414c70cbSLiam Girdwood regulator->uA_load = uA_load; 1900414c70cbSLiam Girdwood ret = regulator_check_drms(rdev); 1901414c70cbSLiam Girdwood if (ret < 0) 1902414c70cbSLiam Girdwood goto out; 1903414c70cbSLiam Girdwood ret = -EINVAL; 1904414c70cbSLiam Girdwood 1905414c70cbSLiam Girdwood /* sanity check */ 1906414c70cbSLiam Girdwood if (!rdev->desc->ops->get_optimum_mode) 1907414c70cbSLiam Girdwood goto out; 1908414c70cbSLiam Girdwood 1909414c70cbSLiam Girdwood /* get output voltage */ 1910414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 1911414c70cbSLiam Girdwood if (output_uV <= 0) { 1912414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid output voltage found for %s\n", 19131083c393SMark Brown __func__, rdev_get_name(rdev)); 1914414c70cbSLiam Girdwood goto out; 1915414c70cbSLiam Girdwood } 1916414c70cbSLiam Girdwood 1917414c70cbSLiam Girdwood /* get input voltage */ 1918414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1919414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1920414c70cbSLiam Girdwood else 1921414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 1922414c70cbSLiam Girdwood if (input_uV <= 0) { 1923414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid input voltage found for %s\n", 19241083c393SMark Brown __func__, rdev_get_name(rdev)); 1925414c70cbSLiam Girdwood goto out; 1926414c70cbSLiam Girdwood } 1927414c70cbSLiam Girdwood 1928414c70cbSLiam Girdwood /* calc total requested load for this regulator */ 1929414c70cbSLiam Girdwood list_for_each_entry(consumer, &rdev->consumer_list, list) 1930414c70cbSLiam Girdwood total_uA_load += consumer->uA_load; 1931414c70cbSLiam Girdwood 1932414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, 1933414c70cbSLiam Girdwood input_uV, output_uV, 1934414c70cbSLiam Girdwood total_uA_load); 1935e573520bSDavid Brownell ret = regulator_check_mode(rdev, mode); 1936e573520bSDavid Brownell if (ret < 0) { 1937414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to get optimum mode for %s @" 19381083c393SMark Brown " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), 1939414c70cbSLiam Girdwood total_uA_load, input_uV, output_uV); 1940414c70cbSLiam Girdwood goto out; 1941414c70cbSLiam Girdwood } 1942414c70cbSLiam Girdwood 1943414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1944e573520bSDavid Brownell if (ret < 0) { 1945414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 19461083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 1947414c70cbSLiam Girdwood goto out; 1948414c70cbSLiam Girdwood } 1949414c70cbSLiam Girdwood ret = mode; 1950414c70cbSLiam Girdwood out: 1951414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1952414c70cbSLiam Girdwood return ret; 1953414c70cbSLiam Girdwood } 1954414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1955414c70cbSLiam Girdwood 1956414c70cbSLiam Girdwood /** 1957414c70cbSLiam Girdwood * regulator_register_notifier - register regulator event notifier 1958414c70cbSLiam Girdwood * @regulator: regulator source 195969279fb9SMark Brown * @nb: notifier block 1960414c70cbSLiam Girdwood * 1961414c70cbSLiam Girdwood * Register notifier block to receive regulator events. 1962414c70cbSLiam Girdwood */ 1963414c70cbSLiam Girdwood int regulator_register_notifier(struct regulator *regulator, 1964414c70cbSLiam Girdwood struct notifier_block *nb) 1965414c70cbSLiam Girdwood { 1966414c70cbSLiam Girdwood return blocking_notifier_chain_register(®ulator->rdev->notifier, 1967414c70cbSLiam Girdwood nb); 1968414c70cbSLiam Girdwood } 1969414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register_notifier); 1970414c70cbSLiam Girdwood 1971414c70cbSLiam Girdwood /** 1972414c70cbSLiam Girdwood * regulator_unregister_notifier - unregister regulator event notifier 1973414c70cbSLiam Girdwood * @regulator: regulator source 197469279fb9SMark Brown * @nb: notifier block 1975414c70cbSLiam Girdwood * 1976414c70cbSLiam Girdwood * Unregister regulator event notifier block. 1977414c70cbSLiam Girdwood */ 1978414c70cbSLiam Girdwood int regulator_unregister_notifier(struct regulator *regulator, 1979414c70cbSLiam Girdwood struct notifier_block *nb) 1980414c70cbSLiam Girdwood { 1981414c70cbSLiam Girdwood return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1982414c70cbSLiam Girdwood nb); 1983414c70cbSLiam Girdwood } 1984414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1985414c70cbSLiam Girdwood 1986b136fb44SJonathan Cameron /* notify regulator consumers and downstream regulator consumers. 1987b136fb44SJonathan Cameron * Note mutex must be held by caller. 1988b136fb44SJonathan Cameron */ 1989414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 1990414c70cbSLiam Girdwood unsigned long event, void *data) 1991414c70cbSLiam Girdwood { 1992414c70cbSLiam Girdwood struct regulator_dev *_rdev; 1993414c70cbSLiam Girdwood 1994414c70cbSLiam Girdwood /* call rdev chain first */ 1995414c70cbSLiam Girdwood blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1996414c70cbSLiam Girdwood 1997414c70cbSLiam Girdwood /* now notify regulator we supply */ 1998b136fb44SJonathan Cameron list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1999b136fb44SJonathan Cameron mutex_lock(&_rdev->mutex); 2000414c70cbSLiam Girdwood _notifier_call_chain(_rdev, event, data); 2001b136fb44SJonathan Cameron mutex_unlock(&_rdev->mutex); 2002b136fb44SJonathan Cameron } 2003414c70cbSLiam Girdwood } 2004414c70cbSLiam Girdwood 2005414c70cbSLiam Girdwood /** 2006414c70cbSLiam Girdwood * regulator_bulk_get - get multiple regulator consumers 2007414c70cbSLiam Girdwood * 2008414c70cbSLiam Girdwood * @dev: Device to supply 2009414c70cbSLiam Girdwood * @num_consumers: Number of consumers to register 2010414c70cbSLiam Girdwood * @consumers: Configuration of consumers; clients are stored here. 2011414c70cbSLiam Girdwood * 2012414c70cbSLiam Girdwood * @return 0 on success, an errno on failure. 2013414c70cbSLiam Girdwood * 2014414c70cbSLiam Girdwood * This helper function allows drivers to get several regulator 2015414c70cbSLiam Girdwood * consumers in one operation. If any of the regulators cannot be 2016414c70cbSLiam Girdwood * acquired then any regulators that were allocated will be freed 2017414c70cbSLiam Girdwood * before returning to the caller. 2018414c70cbSLiam Girdwood */ 2019414c70cbSLiam Girdwood int regulator_bulk_get(struct device *dev, int num_consumers, 2020414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2021414c70cbSLiam Girdwood { 2022414c70cbSLiam Girdwood int i; 2023414c70cbSLiam Girdwood int ret; 2024414c70cbSLiam Girdwood 2025414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) 2026414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2027414c70cbSLiam Girdwood 2028414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2029414c70cbSLiam Girdwood consumers[i].consumer = regulator_get(dev, 2030414c70cbSLiam Girdwood consumers[i].supply); 2031414c70cbSLiam Girdwood if (IS_ERR(consumers[i].consumer)) { 2032414c70cbSLiam Girdwood ret = PTR_ERR(consumers[i].consumer); 20335b307627SMark Brown dev_err(dev, "Failed to get supply '%s': %d\n", 20345b307627SMark Brown consumers[i].supply, ret); 2035414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2036414c70cbSLiam Girdwood goto err; 2037414c70cbSLiam Girdwood } 2038414c70cbSLiam Girdwood } 2039414c70cbSLiam Girdwood 2040414c70cbSLiam Girdwood return 0; 2041414c70cbSLiam Girdwood 2042414c70cbSLiam Girdwood err: 2043414c70cbSLiam Girdwood for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2044414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2045414c70cbSLiam Girdwood 2046414c70cbSLiam Girdwood return ret; 2047414c70cbSLiam Girdwood } 2048414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_get); 2049414c70cbSLiam Girdwood 2050414c70cbSLiam Girdwood /** 2051414c70cbSLiam Girdwood * regulator_bulk_enable - enable multiple regulator consumers 2052414c70cbSLiam Girdwood * 2053414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2054414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2055414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2056414c70cbSLiam Girdwood * 2057414c70cbSLiam Girdwood * This convenience API allows consumers to enable multiple regulator 2058414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2059414c70cbSLiam Girdwood * then any others that were enabled will be disabled again prior to 2060414c70cbSLiam Girdwood * return. 2061414c70cbSLiam Girdwood */ 2062414c70cbSLiam Girdwood int regulator_bulk_enable(int num_consumers, 2063414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2064414c70cbSLiam Girdwood { 2065414c70cbSLiam Girdwood int i; 2066414c70cbSLiam Girdwood int ret; 2067414c70cbSLiam Girdwood 2068414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2069414c70cbSLiam Girdwood ret = regulator_enable(consumers[i].consumer); 2070414c70cbSLiam Girdwood if (ret != 0) 2071414c70cbSLiam Girdwood goto err; 2072414c70cbSLiam Girdwood } 2073414c70cbSLiam Girdwood 2074414c70cbSLiam Girdwood return 0; 2075414c70cbSLiam Girdwood 2076414c70cbSLiam Girdwood err: 20775b307627SMark Brown printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); 2078eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2079414c70cbSLiam Girdwood regulator_disable(consumers[i].consumer); 2080414c70cbSLiam Girdwood 2081414c70cbSLiam Girdwood return ret; 2082414c70cbSLiam Girdwood } 2083414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2084414c70cbSLiam Girdwood 2085414c70cbSLiam Girdwood /** 2086414c70cbSLiam Girdwood * regulator_bulk_disable - disable multiple regulator consumers 2087414c70cbSLiam Girdwood * 2088414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2089414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2090414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2091414c70cbSLiam Girdwood * 2092414c70cbSLiam Girdwood * This convenience API allows consumers to disable multiple regulator 2093414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2094414c70cbSLiam Girdwood * then any others that were disabled will be disabled again prior to 2095414c70cbSLiam Girdwood * return. 2096414c70cbSLiam Girdwood */ 2097414c70cbSLiam Girdwood int regulator_bulk_disable(int num_consumers, 2098414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2099414c70cbSLiam Girdwood { 2100414c70cbSLiam Girdwood int i; 2101414c70cbSLiam Girdwood int ret; 2102414c70cbSLiam Girdwood 2103414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2104414c70cbSLiam Girdwood ret = regulator_disable(consumers[i].consumer); 2105414c70cbSLiam Girdwood if (ret != 0) 2106414c70cbSLiam Girdwood goto err; 2107414c70cbSLiam Girdwood } 2108414c70cbSLiam Girdwood 2109414c70cbSLiam Girdwood return 0; 2110414c70cbSLiam Girdwood 2111414c70cbSLiam Girdwood err: 21125b307627SMark Brown printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, 21135b307627SMark Brown ret); 2114eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2115414c70cbSLiam Girdwood regulator_enable(consumers[i].consumer); 2116414c70cbSLiam Girdwood 2117414c70cbSLiam Girdwood return ret; 2118414c70cbSLiam Girdwood } 2119414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2120414c70cbSLiam Girdwood 2121414c70cbSLiam Girdwood /** 2122414c70cbSLiam Girdwood * regulator_bulk_free - free multiple regulator consumers 2123414c70cbSLiam Girdwood * 2124414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2125414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2126414c70cbSLiam Girdwood * 2127414c70cbSLiam Girdwood * This convenience API allows consumers to free multiple regulator 2128414c70cbSLiam Girdwood * clients in a single API call. 2129414c70cbSLiam Girdwood */ 2130414c70cbSLiam Girdwood void regulator_bulk_free(int num_consumers, 2131414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2132414c70cbSLiam Girdwood { 2133414c70cbSLiam Girdwood int i; 2134414c70cbSLiam Girdwood 2135414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2136414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2137414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2138414c70cbSLiam Girdwood } 2139414c70cbSLiam Girdwood } 2140414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_free); 2141414c70cbSLiam Girdwood 2142414c70cbSLiam Girdwood /** 2143414c70cbSLiam Girdwood * regulator_notifier_call_chain - call regulator event notifier 214469279fb9SMark Brown * @rdev: regulator source 2145414c70cbSLiam Girdwood * @event: notifier block 214669279fb9SMark Brown * @data: callback-specific data. 2147414c70cbSLiam Girdwood * 2148414c70cbSLiam Girdwood * Called by regulator drivers to notify clients a regulator event has 2149414c70cbSLiam Girdwood * occurred. We also notify regulator clients downstream. 2150b136fb44SJonathan Cameron * Note lock must be held by caller. 2151414c70cbSLiam Girdwood */ 2152414c70cbSLiam Girdwood int regulator_notifier_call_chain(struct regulator_dev *rdev, 2153414c70cbSLiam Girdwood unsigned long event, void *data) 2154414c70cbSLiam Girdwood { 2155414c70cbSLiam Girdwood _notifier_call_chain(rdev, event, data); 2156414c70cbSLiam Girdwood return NOTIFY_DONE; 2157414c70cbSLiam Girdwood 2158414c70cbSLiam Girdwood } 2159414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2160414c70cbSLiam Girdwood 2161be721979SMark Brown /** 2162be721979SMark Brown * regulator_mode_to_status - convert a regulator mode into a status 2163be721979SMark Brown * 2164be721979SMark Brown * @mode: Mode to convert 2165be721979SMark Brown * 2166be721979SMark Brown * Convert a regulator mode into a status. 2167be721979SMark Brown */ 2168be721979SMark Brown int regulator_mode_to_status(unsigned int mode) 2169be721979SMark Brown { 2170be721979SMark Brown switch (mode) { 2171be721979SMark Brown case REGULATOR_MODE_FAST: 2172be721979SMark Brown return REGULATOR_STATUS_FAST; 2173be721979SMark Brown case REGULATOR_MODE_NORMAL: 2174be721979SMark Brown return REGULATOR_STATUS_NORMAL; 2175be721979SMark Brown case REGULATOR_MODE_IDLE: 2176be721979SMark Brown return REGULATOR_STATUS_IDLE; 2177be721979SMark Brown case REGULATOR_STATUS_STANDBY: 2178be721979SMark Brown return REGULATOR_STATUS_STANDBY; 2179be721979SMark Brown default: 2180be721979SMark Brown return 0; 2181be721979SMark Brown } 2182be721979SMark Brown } 2183be721979SMark Brown EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2184be721979SMark Brown 21857ad68e2fSDavid Brownell /* 21867ad68e2fSDavid Brownell * To avoid cluttering sysfs (and memory) with useless state, only 21877ad68e2fSDavid Brownell * create attributes that can be meaningfully displayed. 21887ad68e2fSDavid Brownell */ 21897ad68e2fSDavid Brownell static int add_regulator_attributes(struct regulator_dev *rdev) 21907ad68e2fSDavid Brownell { 21917ad68e2fSDavid Brownell struct device *dev = &rdev->dev; 21927ad68e2fSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 21937ad68e2fSDavid Brownell int status = 0; 21947ad68e2fSDavid Brownell 21957ad68e2fSDavid Brownell /* some attributes need specific methods to be displayed */ 21967ad68e2fSDavid Brownell if (ops->get_voltage) { 21977ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microvolts); 21987ad68e2fSDavid Brownell if (status < 0) 21997ad68e2fSDavid Brownell return status; 22007ad68e2fSDavid Brownell } 22017ad68e2fSDavid Brownell if (ops->get_current_limit) { 22027ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microamps); 22037ad68e2fSDavid Brownell if (status < 0) 22047ad68e2fSDavid Brownell return status; 22057ad68e2fSDavid Brownell } 22067ad68e2fSDavid Brownell if (ops->get_mode) { 22077ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_opmode); 22087ad68e2fSDavid Brownell if (status < 0) 22097ad68e2fSDavid Brownell return status; 22107ad68e2fSDavid Brownell } 22117ad68e2fSDavid Brownell if (ops->is_enabled) { 22127ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_state); 22137ad68e2fSDavid Brownell if (status < 0) 22147ad68e2fSDavid Brownell return status; 22157ad68e2fSDavid Brownell } 2216853116a1SDavid Brownell if (ops->get_status) { 2217853116a1SDavid Brownell status = device_create_file(dev, &dev_attr_status); 2218853116a1SDavid Brownell if (status < 0) 2219853116a1SDavid Brownell return status; 2220853116a1SDavid Brownell } 22217ad68e2fSDavid Brownell 22227ad68e2fSDavid Brownell /* some attributes are type-specific */ 22237ad68e2fSDavid Brownell if (rdev->desc->type == REGULATOR_CURRENT) { 22247ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_requested_microamps); 22257ad68e2fSDavid Brownell if (status < 0) 22267ad68e2fSDavid Brownell return status; 22277ad68e2fSDavid Brownell } 22287ad68e2fSDavid Brownell 22297ad68e2fSDavid Brownell /* all the other attributes exist to support constraints; 22307ad68e2fSDavid Brownell * don't show them if there are no constraints, or if the 22317ad68e2fSDavid Brownell * relevant supporting methods are missing. 22327ad68e2fSDavid Brownell */ 22337ad68e2fSDavid Brownell if (!rdev->constraints) 22347ad68e2fSDavid Brownell return status; 22357ad68e2fSDavid Brownell 22367ad68e2fSDavid Brownell /* constraints need specific supporting methods */ 22377ad68e2fSDavid Brownell if (ops->set_voltage) { 22387ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microvolts); 22397ad68e2fSDavid Brownell if (status < 0) 22407ad68e2fSDavid Brownell return status; 22417ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microvolts); 22427ad68e2fSDavid Brownell if (status < 0) 22437ad68e2fSDavid Brownell return status; 22447ad68e2fSDavid Brownell } 22457ad68e2fSDavid Brownell if (ops->set_current_limit) { 22467ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microamps); 22477ad68e2fSDavid Brownell if (status < 0) 22487ad68e2fSDavid Brownell return status; 22497ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microamps); 22507ad68e2fSDavid Brownell if (status < 0) 22517ad68e2fSDavid Brownell return status; 22527ad68e2fSDavid Brownell } 22537ad68e2fSDavid Brownell 22547ad68e2fSDavid Brownell /* suspend mode constraints need multiple supporting methods */ 22557ad68e2fSDavid Brownell if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 22567ad68e2fSDavid Brownell return status; 22577ad68e2fSDavid Brownell 22587ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_standby_state); 22597ad68e2fSDavid Brownell if (status < 0) 22607ad68e2fSDavid Brownell return status; 22617ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_mem_state); 22627ad68e2fSDavid Brownell if (status < 0) 22637ad68e2fSDavid Brownell return status; 22647ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_disk_state); 22657ad68e2fSDavid Brownell if (status < 0) 22667ad68e2fSDavid Brownell return status; 22677ad68e2fSDavid Brownell 22687ad68e2fSDavid Brownell if (ops->set_suspend_voltage) { 22697ad68e2fSDavid Brownell status = device_create_file(dev, 22707ad68e2fSDavid Brownell &dev_attr_suspend_standby_microvolts); 22717ad68e2fSDavid Brownell if (status < 0) 22727ad68e2fSDavid Brownell return status; 22737ad68e2fSDavid Brownell status = device_create_file(dev, 22747ad68e2fSDavid Brownell &dev_attr_suspend_mem_microvolts); 22757ad68e2fSDavid Brownell if (status < 0) 22767ad68e2fSDavid Brownell return status; 22777ad68e2fSDavid Brownell status = device_create_file(dev, 22787ad68e2fSDavid Brownell &dev_attr_suspend_disk_microvolts); 22797ad68e2fSDavid Brownell if (status < 0) 22807ad68e2fSDavid Brownell return status; 22817ad68e2fSDavid Brownell } 22827ad68e2fSDavid Brownell 22837ad68e2fSDavid Brownell if (ops->set_suspend_mode) { 22847ad68e2fSDavid Brownell status = device_create_file(dev, 22857ad68e2fSDavid Brownell &dev_attr_suspend_standby_mode); 22867ad68e2fSDavid Brownell if (status < 0) 22877ad68e2fSDavid Brownell return status; 22887ad68e2fSDavid Brownell status = device_create_file(dev, 22897ad68e2fSDavid Brownell &dev_attr_suspend_mem_mode); 22907ad68e2fSDavid Brownell if (status < 0) 22917ad68e2fSDavid Brownell return status; 22927ad68e2fSDavid Brownell status = device_create_file(dev, 22937ad68e2fSDavid Brownell &dev_attr_suspend_disk_mode); 22947ad68e2fSDavid Brownell if (status < 0) 22957ad68e2fSDavid Brownell return status; 22967ad68e2fSDavid Brownell } 22977ad68e2fSDavid Brownell 22987ad68e2fSDavid Brownell return status; 22997ad68e2fSDavid Brownell } 23007ad68e2fSDavid Brownell 2301414c70cbSLiam Girdwood /** 2302414c70cbSLiam Girdwood * regulator_register - register regulator 230369279fb9SMark Brown * @regulator_desc: regulator to register 230469279fb9SMark Brown * @dev: struct device for the regulator 23050527100fSMark Brown * @init_data: platform provided init data, passed through by driver 230669279fb9SMark Brown * @driver_data: private regulator data 2307414c70cbSLiam Girdwood * 2308414c70cbSLiam Girdwood * Called by regulator drivers to register a regulator. 2309414c70cbSLiam Girdwood * Returns 0 on success. 2310414c70cbSLiam Girdwood */ 2311414c70cbSLiam Girdwood struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 23120527100fSMark Brown struct device *dev, struct regulator_init_data *init_data, 23130527100fSMark Brown void *driver_data) 2314414c70cbSLiam Girdwood { 2315414c70cbSLiam Girdwood static atomic_t regulator_no = ATOMIC_INIT(0); 2316414c70cbSLiam Girdwood struct regulator_dev *rdev; 2317a5766f11SLiam Girdwood int ret, i; 2318414c70cbSLiam Girdwood 2319414c70cbSLiam Girdwood if (regulator_desc == NULL) 2320414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2321414c70cbSLiam Girdwood 2322414c70cbSLiam Girdwood if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2323414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2324414c70cbSLiam Girdwood 2325cd78dfc6SDiego Liziero if (regulator_desc->type != REGULATOR_VOLTAGE && 2326cd78dfc6SDiego Liziero regulator_desc->type != REGULATOR_CURRENT) 2327414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2328414c70cbSLiam Girdwood 232946fabe1eSMark Brown if (!init_data) 233046fabe1eSMark Brown return ERR_PTR(-EINVAL); 233146fabe1eSMark Brown 2332414c70cbSLiam Girdwood rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2333414c70cbSLiam Girdwood if (rdev == NULL) 2334414c70cbSLiam Girdwood return ERR_PTR(-ENOMEM); 2335414c70cbSLiam Girdwood 2336414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2337414c70cbSLiam Girdwood 2338414c70cbSLiam Girdwood mutex_init(&rdev->mutex); 2339a5766f11SLiam Girdwood rdev->reg_data = driver_data; 2340414c70cbSLiam Girdwood rdev->owner = regulator_desc->owner; 2341414c70cbSLiam Girdwood rdev->desc = regulator_desc; 2342414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->consumer_list); 2343414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->supply_list); 2344414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->list); 2345414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->slist); 2346414c70cbSLiam Girdwood BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2347414c70cbSLiam Girdwood 2348a5766f11SLiam Girdwood /* preform any regulator specific init */ 2349a5766f11SLiam Girdwood if (init_data->regulator_init) { 2350a5766f11SLiam Girdwood ret = init_data->regulator_init(rdev->reg_data); 23514fca9545SDavid Brownell if (ret < 0) 23524fca9545SDavid Brownell goto clean; 2353a5766f11SLiam Girdwood } 2354a5766f11SLiam Girdwood 2355a5766f11SLiam Girdwood /* register with sysfs */ 2356a5766f11SLiam Girdwood rdev->dev.class = ®ulator_class; 2357a5766f11SLiam Girdwood rdev->dev.parent = dev; 2358812460a9SKay Sievers dev_set_name(&rdev->dev, "regulator.%d", 2359812460a9SKay Sievers atomic_inc_return(®ulator_no) - 1); 2360a5766f11SLiam Girdwood ret = device_register(&rdev->dev); 2361ad7725cbSVasiliy Kulikov if (ret != 0) { 2362ad7725cbSVasiliy Kulikov put_device(&rdev->dev); 23634fca9545SDavid Brownell goto clean; 2364ad7725cbSVasiliy Kulikov } 2365a5766f11SLiam Girdwood 2366a5766f11SLiam Girdwood dev_set_drvdata(&rdev->dev, rdev); 2367a5766f11SLiam Girdwood 236874f544c1SMike Rapoport /* set regulator constraints */ 236974f544c1SMike Rapoport ret = set_machine_constraints(rdev, &init_data->constraints); 237074f544c1SMike Rapoport if (ret < 0) 237174f544c1SMike Rapoport goto scrub; 237274f544c1SMike Rapoport 23737ad68e2fSDavid Brownell /* add attributes supported by this regulator */ 23747ad68e2fSDavid Brownell ret = add_regulator_attributes(rdev); 23757ad68e2fSDavid Brownell if (ret < 0) 23767ad68e2fSDavid Brownell goto scrub; 23777ad68e2fSDavid Brownell 2378a5766f11SLiam Girdwood /* set supply regulator if it exists */ 23790178f3e2SMark Brown if (init_data->supply_regulator && init_data->supply_regulator_dev) { 23800178f3e2SMark Brown dev_err(dev, 23810178f3e2SMark Brown "Supply regulator specified by both name and dev\n"); 23827727da22SAxel Lin ret = -EINVAL; 23830178f3e2SMark Brown goto scrub; 23840178f3e2SMark Brown } 23850178f3e2SMark Brown 23860178f3e2SMark Brown if (init_data->supply_regulator) { 23870178f3e2SMark Brown struct regulator_dev *r; 23880178f3e2SMark Brown int found = 0; 23890178f3e2SMark Brown 23900178f3e2SMark Brown list_for_each_entry(r, ®ulator_list, list) { 23910178f3e2SMark Brown if (strcmp(rdev_get_name(r), 23920178f3e2SMark Brown init_data->supply_regulator) == 0) { 23930178f3e2SMark Brown found = 1; 23940178f3e2SMark Brown break; 23950178f3e2SMark Brown } 23960178f3e2SMark Brown } 23970178f3e2SMark Brown 23980178f3e2SMark Brown if (!found) { 23990178f3e2SMark Brown dev_err(dev, "Failed to find supply %s\n", 24000178f3e2SMark Brown init_data->supply_regulator); 24017727da22SAxel Lin ret = -ENODEV; 24020178f3e2SMark Brown goto scrub; 24030178f3e2SMark Brown } 24040178f3e2SMark Brown 24050178f3e2SMark Brown ret = set_supply(rdev, r); 24060178f3e2SMark Brown if (ret < 0) 24070178f3e2SMark Brown goto scrub; 24080178f3e2SMark Brown } 24090178f3e2SMark Brown 2410a5766f11SLiam Girdwood if (init_data->supply_regulator_dev) { 24110178f3e2SMark Brown dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2412a5766f11SLiam Girdwood ret = set_supply(rdev, 2413a5766f11SLiam Girdwood dev_get_drvdata(init_data->supply_regulator_dev)); 24144fca9545SDavid Brownell if (ret < 0) 24154fca9545SDavid Brownell goto scrub; 2416a5766f11SLiam Girdwood } 2417a5766f11SLiam Girdwood 2418a5766f11SLiam Girdwood /* add consumers devices */ 2419a5766f11SLiam Girdwood for (i = 0; i < init_data->num_consumer_supplies; i++) { 2420a5766f11SLiam Girdwood ret = set_consumer_device_supply(rdev, 2421a5766f11SLiam Girdwood init_data->consumer_supplies[i].dev, 242240f9244fSMark Brown init_data->consumer_supplies[i].dev_name, 2423a5766f11SLiam Girdwood init_data->consumer_supplies[i].supply); 2424d4033b54SJani Nikula if (ret < 0) 2425d4033b54SJani Nikula goto unset_supplies; 2426a5766f11SLiam Girdwood } 2427a5766f11SLiam Girdwood 2428a5766f11SLiam Girdwood list_add(&rdev->list, ®ulator_list); 2429a5766f11SLiam Girdwood out: 2430414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2431414c70cbSLiam Girdwood return rdev; 24324fca9545SDavid Brownell 2433d4033b54SJani Nikula unset_supplies: 2434d4033b54SJani Nikula unset_regulator_supplies(rdev); 2435d4033b54SJani Nikula 24364fca9545SDavid Brownell scrub: 24374fca9545SDavid Brownell device_unregister(&rdev->dev); 243853032dafSPaul Walmsley /* device core frees rdev */ 243953032dafSPaul Walmsley rdev = ERR_PTR(ret); 244053032dafSPaul Walmsley goto out; 244153032dafSPaul Walmsley 24424fca9545SDavid Brownell clean: 24434fca9545SDavid Brownell kfree(rdev); 24444fca9545SDavid Brownell rdev = ERR_PTR(ret); 24454fca9545SDavid Brownell goto out; 2446414c70cbSLiam Girdwood } 2447414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register); 2448414c70cbSLiam Girdwood 2449414c70cbSLiam Girdwood /** 2450414c70cbSLiam Girdwood * regulator_unregister - unregister regulator 245169279fb9SMark Brown * @rdev: regulator to unregister 2452414c70cbSLiam Girdwood * 2453414c70cbSLiam Girdwood * Called by regulator drivers to unregister a regulator. 2454414c70cbSLiam Girdwood */ 2455414c70cbSLiam Girdwood void regulator_unregister(struct regulator_dev *rdev) 2456414c70cbSLiam Girdwood { 2457414c70cbSLiam Girdwood if (rdev == NULL) 2458414c70cbSLiam Girdwood return; 2459414c70cbSLiam Girdwood 2460414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 24616bf87d17SMark Brown WARN_ON(rdev->open_count); 24620f1d747bSMike Rapoport unset_regulator_supplies(rdev); 2463414c70cbSLiam Girdwood list_del(&rdev->list); 2464414c70cbSLiam Girdwood if (rdev->supply) 2465414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, "supply"); 2466414c70cbSLiam Girdwood device_unregister(&rdev->dev); 2467414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2468414c70cbSLiam Girdwood } 2469414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister); 2470414c70cbSLiam Girdwood 2471414c70cbSLiam Girdwood /** 2472cf7bbcdfSMark Brown * regulator_suspend_prepare - prepare regulators for system wide suspend 2473414c70cbSLiam Girdwood * @state: system suspend state 2474414c70cbSLiam Girdwood * 2475414c70cbSLiam Girdwood * Configure each regulator with it's suspend operating parameters for state. 2476414c70cbSLiam Girdwood * This will usually be called by machine suspend code prior to supending. 2477414c70cbSLiam Girdwood */ 2478414c70cbSLiam Girdwood int regulator_suspend_prepare(suspend_state_t state) 2479414c70cbSLiam Girdwood { 2480414c70cbSLiam Girdwood struct regulator_dev *rdev; 2481414c70cbSLiam Girdwood int ret = 0; 2482414c70cbSLiam Girdwood 2483414c70cbSLiam Girdwood /* ON is handled by regulator active state */ 2484414c70cbSLiam Girdwood if (state == PM_SUSPEND_ON) 2485414c70cbSLiam Girdwood return -EINVAL; 2486414c70cbSLiam Girdwood 2487414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2488414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 2489414c70cbSLiam Girdwood 2490414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2491414c70cbSLiam Girdwood ret = suspend_prepare(rdev, state); 2492414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2493414c70cbSLiam Girdwood 2494414c70cbSLiam Girdwood if (ret < 0) { 2495414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to prepare %s\n", 24961083c393SMark Brown __func__, rdev_get_name(rdev)); 2497414c70cbSLiam Girdwood goto out; 2498414c70cbSLiam Girdwood } 2499414c70cbSLiam Girdwood } 2500414c70cbSLiam Girdwood out: 2501414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2502414c70cbSLiam Girdwood return ret; 2503414c70cbSLiam Girdwood } 2504414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2505414c70cbSLiam Girdwood 2506414c70cbSLiam Girdwood /** 2507ca725561SMark Brown * regulator_has_full_constraints - the system has fully specified constraints 2508ca725561SMark Brown * 2509ca725561SMark Brown * Calling this function will cause the regulator API to disable all 2510ca725561SMark Brown * regulators which have a zero use count and don't have an always_on 2511ca725561SMark Brown * constraint in a late_initcall. 2512ca725561SMark Brown * 2513ca725561SMark Brown * The intention is that this will become the default behaviour in a 2514ca725561SMark Brown * future kernel release so users are encouraged to use this facility 2515ca725561SMark Brown * now. 2516ca725561SMark Brown */ 2517ca725561SMark Brown void regulator_has_full_constraints(void) 2518ca725561SMark Brown { 2519ca725561SMark Brown has_full_constraints = 1; 2520ca725561SMark Brown } 2521ca725561SMark Brown EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2522ca725561SMark Brown 2523ca725561SMark Brown /** 2524688fe99aSMark Brown * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2525688fe99aSMark Brown * 2526688fe99aSMark Brown * Calling this function will cause the regulator API to provide a 2527688fe99aSMark Brown * dummy regulator to consumers if no physical regulator is found, 2528688fe99aSMark Brown * allowing most consumers to proceed as though a regulator were 2529688fe99aSMark Brown * configured. This allows systems such as those with software 2530688fe99aSMark Brown * controllable regulators for the CPU core only to be brought up more 2531688fe99aSMark Brown * readily. 2532688fe99aSMark Brown */ 2533688fe99aSMark Brown void regulator_use_dummy_regulator(void) 2534688fe99aSMark Brown { 2535688fe99aSMark Brown board_wants_dummy_regulator = true; 2536688fe99aSMark Brown } 2537688fe99aSMark Brown EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2538688fe99aSMark Brown 2539688fe99aSMark Brown /** 2540414c70cbSLiam Girdwood * rdev_get_drvdata - get rdev regulator driver data 254169279fb9SMark Brown * @rdev: regulator 2542414c70cbSLiam Girdwood * 2543414c70cbSLiam Girdwood * Get rdev regulator driver private data. This call can be used in the 2544414c70cbSLiam Girdwood * regulator driver context. 2545414c70cbSLiam Girdwood */ 2546414c70cbSLiam Girdwood void *rdev_get_drvdata(struct regulator_dev *rdev) 2547414c70cbSLiam Girdwood { 2548414c70cbSLiam Girdwood return rdev->reg_data; 2549414c70cbSLiam Girdwood } 2550414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2551414c70cbSLiam Girdwood 2552414c70cbSLiam Girdwood /** 2553414c70cbSLiam Girdwood * regulator_get_drvdata - get regulator driver data 2554414c70cbSLiam Girdwood * @regulator: regulator 2555414c70cbSLiam Girdwood * 2556414c70cbSLiam Girdwood * Get regulator driver private data. This call can be used in the consumer 2557414c70cbSLiam Girdwood * driver context when non API regulator specific functions need to be called. 2558414c70cbSLiam Girdwood */ 2559414c70cbSLiam Girdwood void *regulator_get_drvdata(struct regulator *regulator) 2560414c70cbSLiam Girdwood { 2561414c70cbSLiam Girdwood return regulator->rdev->reg_data; 2562414c70cbSLiam Girdwood } 2563414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2564414c70cbSLiam Girdwood 2565414c70cbSLiam Girdwood /** 2566414c70cbSLiam Girdwood * regulator_set_drvdata - set regulator driver data 2567414c70cbSLiam Girdwood * @regulator: regulator 2568414c70cbSLiam Girdwood * @data: data 2569414c70cbSLiam Girdwood */ 2570414c70cbSLiam Girdwood void regulator_set_drvdata(struct regulator *regulator, void *data) 2571414c70cbSLiam Girdwood { 2572414c70cbSLiam Girdwood regulator->rdev->reg_data = data; 2573414c70cbSLiam Girdwood } 2574414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2575414c70cbSLiam Girdwood 2576414c70cbSLiam Girdwood /** 2577414c70cbSLiam Girdwood * regulator_get_id - get regulator ID 257869279fb9SMark Brown * @rdev: regulator 2579414c70cbSLiam Girdwood */ 2580414c70cbSLiam Girdwood int rdev_get_id(struct regulator_dev *rdev) 2581414c70cbSLiam Girdwood { 2582414c70cbSLiam Girdwood return rdev->desc->id; 2583414c70cbSLiam Girdwood } 2584414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_id); 2585414c70cbSLiam Girdwood 2586a5766f11SLiam Girdwood struct device *rdev_get_dev(struct regulator_dev *rdev) 2587a5766f11SLiam Girdwood { 2588a5766f11SLiam Girdwood return &rdev->dev; 2589a5766f11SLiam Girdwood } 2590a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_dev); 2591a5766f11SLiam Girdwood 2592a5766f11SLiam Girdwood void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2593a5766f11SLiam Girdwood { 2594a5766f11SLiam Girdwood return reg_init_data->driver_data; 2595a5766f11SLiam Girdwood } 2596a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2597a5766f11SLiam Girdwood 2598414c70cbSLiam Girdwood static int __init regulator_init(void) 2599414c70cbSLiam Girdwood { 260034abbd68SMark Brown int ret; 260134abbd68SMark Brown 2602414c70cbSLiam Girdwood printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 260334abbd68SMark Brown 260434abbd68SMark Brown ret = class_register(®ulator_class); 260534abbd68SMark Brown 260634abbd68SMark Brown regulator_dummy_init(); 260734abbd68SMark Brown 260834abbd68SMark Brown return ret; 2609414c70cbSLiam Girdwood } 2610414c70cbSLiam Girdwood 2611414c70cbSLiam Girdwood /* init early to allow our consumers to complete system booting */ 2612414c70cbSLiam Girdwood core_initcall(regulator_init); 2613ca725561SMark Brown 2614ca725561SMark Brown static int __init regulator_init_complete(void) 2615ca725561SMark Brown { 2616ca725561SMark Brown struct regulator_dev *rdev; 2617ca725561SMark Brown struct regulator_ops *ops; 2618ca725561SMark Brown struct regulation_constraints *c; 2619ca725561SMark Brown int enabled, ret; 2620ca725561SMark Brown const char *name; 2621ca725561SMark Brown 2622ca725561SMark Brown mutex_lock(®ulator_list_mutex); 2623ca725561SMark Brown 2624ca725561SMark Brown /* If we have a full configuration then disable any regulators 2625ca725561SMark Brown * which are not in use or always_on. This will become the 2626ca725561SMark Brown * default behaviour in the future. 2627ca725561SMark Brown */ 2628ca725561SMark Brown list_for_each_entry(rdev, ®ulator_list, list) { 2629ca725561SMark Brown ops = rdev->desc->ops; 2630ca725561SMark Brown c = rdev->constraints; 2631ca725561SMark Brown 26321083c393SMark Brown name = rdev_get_name(rdev); 2633ca725561SMark Brown 2634f25e0b4fSMark Brown if (!ops->disable || (c && c->always_on)) 2635ca725561SMark Brown continue; 2636ca725561SMark Brown 2637ca725561SMark Brown mutex_lock(&rdev->mutex); 2638ca725561SMark Brown 2639ca725561SMark Brown if (rdev->use_count) 2640ca725561SMark Brown goto unlock; 2641ca725561SMark Brown 2642ca725561SMark Brown /* If we can't read the status assume it's on. */ 2643ca725561SMark Brown if (ops->is_enabled) 2644ca725561SMark Brown enabled = ops->is_enabled(rdev); 2645ca725561SMark Brown else 2646ca725561SMark Brown enabled = 1; 2647ca725561SMark Brown 2648ca725561SMark Brown if (!enabled) 2649ca725561SMark Brown goto unlock; 2650ca725561SMark Brown 2651ca725561SMark Brown if (has_full_constraints) { 2652ca725561SMark Brown /* We log since this may kill the system if it 2653ca725561SMark Brown * goes wrong. */ 2654ca725561SMark Brown printk(KERN_INFO "%s: disabling %s\n", 2655ca725561SMark Brown __func__, name); 2656ca725561SMark Brown ret = ops->disable(rdev); 2657ca725561SMark Brown if (ret != 0) { 2658ca725561SMark Brown printk(KERN_ERR 2659ca725561SMark Brown "%s: couldn't disable %s: %d\n", 2660ca725561SMark Brown __func__, name, ret); 2661ca725561SMark Brown } 2662ca725561SMark Brown } else { 2663ca725561SMark Brown /* The intention is that in future we will 2664ca725561SMark Brown * assume that full constraints are provided 2665ca725561SMark Brown * so warn even if we aren't going to do 2666ca725561SMark Brown * anything here. 2667ca725561SMark Brown */ 2668ca725561SMark Brown printk(KERN_WARNING 2669ca725561SMark Brown "%s: incomplete constraints, leaving %s on\n", 2670ca725561SMark Brown __func__, name); 2671ca725561SMark Brown } 2672ca725561SMark Brown 2673ca725561SMark Brown unlock: 2674ca725561SMark Brown mutex_unlock(&rdev->mutex); 2675ca725561SMark Brown } 2676ca725561SMark Brown 2677ca725561SMark Brown mutex_unlock(®ulator_list_mutex); 2678ca725561SMark Brown 2679ca725561SMark Brown return 0; 2680ca725561SMark Brown } 2681ca725561SMark Brown late_initcall(regulator_init_complete); 2682