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 2834abbd68SMark Brown #include "dummy.h" 2934abbd68SMark Brown 30414c70cbSLiam Girdwood #define REGULATOR_VERSION "0.5" 31414c70cbSLiam Girdwood 32414c70cbSLiam Girdwood static DEFINE_MUTEX(regulator_list_mutex); 33414c70cbSLiam Girdwood static LIST_HEAD(regulator_list); 34414c70cbSLiam Girdwood static LIST_HEAD(regulator_map_list); 35ca725561SMark Brown static int has_full_constraints; 36688fe99aSMark Brown static bool board_wants_dummy_regulator; 37414c70cbSLiam Girdwood 388dc5390dSMark Brown /* 39414c70cbSLiam Girdwood * struct regulator_map 40414c70cbSLiam Girdwood * 41414c70cbSLiam Girdwood * Used to provide symbolic supply names to devices. 42414c70cbSLiam Girdwood */ 43414c70cbSLiam Girdwood struct regulator_map { 44414c70cbSLiam Girdwood struct list_head list; 4540f9244fSMark Brown const char *dev_name; /* The dev_name() for the consumer */ 46414c70cbSLiam Girdwood const char *supply; 47a5766f11SLiam Girdwood struct regulator_dev *regulator; 48414c70cbSLiam Girdwood }; 49414c70cbSLiam Girdwood 50414c70cbSLiam Girdwood /* 51414c70cbSLiam Girdwood * struct regulator 52414c70cbSLiam Girdwood * 53414c70cbSLiam Girdwood * One for each consumer device. 54414c70cbSLiam Girdwood */ 55414c70cbSLiam Girdwood struct regulator { 56414c70cbSLiam Girdwood struct device *dev; 57414c70cbSLiam Girdwood struct list_head list; 58414c70cbSLiam Girdwood int uA_load; 59414c70cbSLiam Girdwood int min_uV; 60414c70cbSLiam Girdwood int max_uV; 61414c70cbSLiam Girdwood char *supply_name; 62414c70cbSLiam Girdwood struct device_attribute dev_attr; 63414c70cbSLiam Girdwood struct regulator_dev *rdev; 64414c70cbSLiam Girdwood }; 65414c70cbSLiam Girdwood 66414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev); 678cbf811dSJeffrey Carlyle static int _regulator_disable(struct regulator_dev *rdev, 688cbf811dSJeffrey Carlyle struct regulator_dev **supply_rdev_ptr); 69414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev); 70414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev); 71414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 72414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 73414c70cbSLiam Girdwood unsigned long event, void *data); 74414c70cbSLiam Girdwood 751083c393SMark Brown static const char *rdev_get_name(struct regulator_dev *rdev) 761083c393SMark Brown { 771083c393SMark Brown if (rdev->constraints && rdev->constraints->name) 781083c393SMark Brown return rdev->constraints->name; 791083c393SMark Brown else if (rdev->desc->name) 801083c393SMark Brown return rdev->desc->name; 811083c393SMark Brown else 821083c393SMark Brown return ""; 831083c393SMark Brown } 841083c393SMark Brown 85414c70cbSLiam Girdwood /* gets the regulator for a given consumer device */ 86414c70cbSLiam Girdwood static struct regulator *get_device_regulator(struct device *dev) 87414c70cbSLiam Girdwood { 88414c70cbSLiam Girdwood struct regulator *regulator = NULL; 89414c70cbSLiam Girdwood struct regulator_dev *rdev; 90414c70cbSLiam Girdwood 91414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 92414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 93414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 94414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) { 95414c70cbSLiam Girdwood if (regulator->dev == dev) { 96414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 97414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 98414c70cbSLiam Girdwood return regulator; 99414c70cbSLiam Girdwood } 100414c70cbSLiam Girdwood } 101414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 102414c70cbSLiam Girdwood } 103414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 104414c70cbSLiam Girdwood return NULL; 105414c70cbSLiam Girdwood } 106414c70cbSLiam Girdwood 107414c70cbSLiam Girdwood /* Platform voltage constraint check */ 108414c70cbSLiam Girdwood static int regulator_check_voltage(struct regulator_dev *rdev, 109414c70cbSLiam Girdwood int *min_uV, int *max_uV) 110414c70cbSLiam Girdwood { 111414c70cbSLiam Girdwood BUG_ON(*min_uV > *max_uV); 112414c70cbSLiam Girdwood 113414c70cbSLiam Girdwood if (!rdev->constraints) { 114414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1151083c393SMark Brown rdev_get_name(rdev)); 116414c70cbSLiam Girdwood return -ENODEV; 117414c70cbSLiam Girdwood } 118414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 119414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1201083c393SMark Brown __func__, rdev_get_name(rdev)); 121414c70cbSLiam Girdwood return -EPERM; 122414c70cbSLiam Girdwood } 123414c70cbSLiam Girdwood 124414c70cbSLiam Girdwood if (*max_uV > rdev->constraints->max_uV) 125414c70cbSLiam Girdwood *max_uV = rdev->constraints->max_uV; 126414c70cbSLiam Girdwood if (*min_uV < rdev->constraints->min_uV) 127414c70cbSLiam Girdwood *min_uV = rdev->constraints->min_uV; 128414c70cbSLiam Girdwood 129414c70cbSLiam Girdwood if (*min_uV > *max_uV) 130414c70cbSLiam Girdwood return -EINVAL; 131414c70cbSLiam Girdwood 132414c70cbSLiam Girdwood return 0; 133414c70cbSLiam Girdwood } 134414c70cbSLiam Girdwood 135414c70cbSLiam Girdwood /* current constraint check */ 136414c70cbSLiam Girdwood static int regulator_check_current_limit(struct regulator_dev *rdev, 137414c70cbSLiam Girdwood int *min_uA, int *max_uA) 138414c70cbSLiam Girdwood { 139414c70cbSLiam Girdwood BUG_ON(*min_uA > *max_uA); 140414c70cbSLiam Girdwood 141414c70cbSLiam Girdwood if (!rdev->constraints) { 142414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1431083c393SMark Brown rdev_get_name(rdev)); 144414c70cbSLiam Girdwood return -ENODEV; 145414c70cbSLiam Girdwood } 146414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 147414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1481083c393SMark Brown __func__, rdev_get_name(rdev)); 149414c70cbSLiam Girdwood return -EPERM; 150414c70cbSLiam Girdwood } 151414c70cbSLiam Girdwood 152414c70cbSLiam Girdwood if (*max_uA > rdev->constraints->max_uA) 153414c70cbSLiam Girdwood *max_uA = rdev->constraints->max_uA; 154414c70cbSLiam Girdwood if (*min_uA < rdev->constraints->min_uA) 155414c70cbSLiam Girdwood *min_uA = rdev->constraints->min_uA; 156414c70cbSLiam Girdwood 157414c70cbSLiam Girdwood if (*min_uA > *max_uA) 158414c70cbSLiam Girdwood return -EINVAL; 159414c70cbSLiam Girdwood 160414c70cbSLiam Girdwood return 0; 161414c70cbSLiam Girdwood } 162414c70cbSLiam Girdwood 163414c70cbSLiam Girdwood /* operating mode constraint check */ 164414c70cbSLiam Girdwood static int regulator_check_mode(struct regulator_dev *rdev, int mode) 165414c70cbSLiam Girdwood { 166e573520bSDavid Brownell switch (mode) { 167e573520bSDavid Brownell case REGULATOR_MODE_FAST: 168e573520bSDavid Brownell case REGULATOR_MODE_NORMAL: 169e573520bSDavid Brownell case REGULATOR_MODE_IDLE: 170e573520bSDavid Brownell case REGULATOR_MODE_STANDBY: 171e573520bSDavid Brownell break; 172e573520bSDavid Brownell default: 173e573520bSDavid Brownell return -EINVAL; 174e573520bSDavid Brownell } 175e573520bSDavid Brownell 176414c70cbSLiam Girdwood if (!rdev->constraints) { 177414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1781083c393SMark Brown rdev_get_name(rdev)); 179414c70cbSLiam Girdwood return -ENODEV; 180414c70cbSLiam Girdwood } 181414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 182414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1831083c393SMark Brown __func__, rdev_get_name(rdev)); 184414c70cbSLiam Girdwood return -EPERM; 185414c70cbSLiam Girdwood } 186414c70cbSLiam Girdwood if (!(rdev->constraints->valid_modes_mask & mode)) { 187414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid mode %x for %s\n", 1881083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 189414c70cbSLiam Girdwood return -EINVAL; 190414c70cbSLiam Girdwood } 191414c70cbSLiam Girdwood return 0; 192414c70cbSLiam Girdwood } 193414c70cbSLiam Girdwood 194414c70cbSLiam Girdwood /* dynamic regulator mode switching constraint check */ 195414c70cbSLiam Girdwood static int regulator_check_drms(struct regulator_dev *rdev) 196414c70cbSLiam Girdwood { 197414c70cbSLiam Girdwood if (!rdev->constraints) { 198414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1991083c393SMark Brown rdev_get_name(rdev)); 200414c70cbSLiam Girdwood return -ENODEV; 201414c70cbSLiam Girdwood } 202414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 203414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 2041083c393SMark Brown __func__, rdev_get_name(rdev)); 205414c70cbSLiam Girdwood return -EPERM; 206414c70cbSLiam Girdwood } 207414c70cbSLiam Girdwood return 0; 208414c70cbSLiam Girdwood } 209414c70cbSLiam Girdwood 210414c70cbSLiam Girdwood static ssize_t device_requested_uA_show(struct device *dev, 211414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 212414c70cbSLiam Girdwood { 213414c70cbSLiam Girdwood struct regulator *regulator; 214414c70cbSLiam Girdwood 215414c70cbSLiam Girdwood regulator = get_device_regulator(dev); 216414c70cbSLiam Girdwood if (regulator == NULL) 217414c70cbSLiam Girdwood return 0; 218414c70cbSLiam Girdwood 219414c70cbSLiam Girdwood return sprintf(buf, "%d\n", regulator->uA_load); 220414c70cbSLiam Girdwood } 221414c70cbSLiam Girdwood 222414c70cbSLiam Girdwood static ssize_t regulator_uV_show(struct device *dev, 223414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 224414c70cbSLiam Girdwood { 225a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 226414c70cbSLiam Girdwood ssize_t ret; 227414c70cbSLiam Girdwood 228414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 229414c70cbSLiam Girdwood ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 230414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 231414c70cbSLiam Girdwood 232414c70cbSLiam Girdwood return ret; 233414c70cbSLiam Girdwood } 2347ad68e2fSDavid Brownell static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 235414c70cbSLiam Girdwood 236414c70cbSLiam Girdwood static ssize_t regulator_uA_show(struct device *dev, 237414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 238414c70cbSLiam Girdwood { 239a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 240414c70cbSLiam Girdwood 241414c70cbSLiam Girdwood return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 242414c70cbSLiam Girdwood } 2437ad68e2fSDavid Brownell static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 244414c70cbSLiam Girdwood 245bc558a60SMark Brown static ssize_t regulator_name_show(struct device *dev, 246bc558a60SMark Brown struct device_attribute *attr, char *buf) 247bc558a60SMark Brown { 248bc558a60SMark Brown struct regulator_dev *rdev = dev_get_drvdata(dev); 249bc558a60SMark Brown 2501083c393SMark Brown return sprintf(buf, "%s\n", rdev_get_name(rdev)); 251bc558a60SMark Brown } 252bc558a60SMark Brown 2534fca9545SDavid Brownell static ssize_t regulator_print_opmode(char *buf, int mode) 254414c70cbSLiam Girdwood { 255414c70cbSLiam Girdwood switch (mode) { 256414c70cbSLiam Girdwood case REGULATOR_MODE_FAST: 257414c70cbSLiam Girdwood return sprintf(buf, "fast\n"); 258414c70cbSLiam Girdwood case REGULATOR_MODE_NORMAL: 259414c70cbSLiam Girdwood return sprintf(buf, "normal\n"); 260414c70cbSLiam Girdwood case REGULATOR_MODE_IDLE: 261414c70cbSLiam Girdwood return sprintf(buf, "idle\n"); 262414c70cbSLiam Girdwood case REGULATOR_MODE_STANDBY: 263414c70cbSLiam Girdwood return sprintf(buf, "standby\n"); 264414c70cbSLiam Girdwood } 265414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 266414c70cbSLiam Girdwood } 267414c70cbSLiam Girdwood 2684fca9545SDavid Brownell static ssize_t regulator_opmode_show(struct device *dev, 269414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 270414c70cbSLiam Girdwood { 271a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 272414c70cbSLiam Girdwood 2734fca9545SDavid Brownell return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 2744fca9545SDavid Brownell } 2757ad68e2fSDavid Brownell static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 2764fca9545SDavid Brownell 2774fca9545SDavid Brownell static ssize_t regulator_print_state(char *buf, int state) 2784fca9545SDavid Brownell { 279414c70cbSLiam Girdwood if (state > 0) 280414c70cbSLiam Girdwood return sprintf(buf, "enabled\n"); 281414c70cbSLiam Girdwood else if (state == 0) 282414c70cbSLiam Girdwood return sprintf(buf, "disabled\n"); 283414c70cbSLiam Girdwood else 284414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 285414c70cbSLiam Girdwood } 286414c70cbSLiam Girdwood 2874fca9545SDavid Brownell static ssize_t regulator_state_show(struct device *dev, 2884fca9545SDavid Brownell struct device_attribute *attr, char *buf) 2894fca9545SDavid Brownell { 2904fca9545SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 2919332546fSMark Brown ssize_t ret; 2924fca9545SDavid Brownell 2939332546fSMark Brown mutex_lock(&rdev->mutex); 2949332546fSMark Brown ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 2959332546fSMark Brown mutex_unlock(&rdev->mutex); 2969332546fSMark Brown 2979332546fSMark Brown return ret; 2984fca9545SDavid Brownell } 2997ad68e2fSDavid Brownell static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 3004fca9545SDavid Brownell 301853116a1SDavid Brownell static ssize_t regulator_status_show(struct device *dev, 302853116a1SDavid Brownell struct device_attribute *attr, char *buf) 303853116a1SDavid Brownell { 304853116a1SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 305853116a1SDavid Brownell int status; 306853116a1SDavid Brownell char *label; 307853116a1SDavid Brownell 308853116a1SDavid Brownell status = rdev->desc->ops->get_status(rdev); 309853116a1SDavid Brownell if (status < 0) 310853116a1SDavid Brownell return status; 311853116a1SDavid Brownell 312853116a1SDavid Brownell switch (status) { 313853116a1SDavid Brownell case REGULATOR_STATUS_OFF: 314853116a1SDavid Brownell label = "off"; 315853116a1SDavid Brownell break; 316853116a1SDavid Brownell case REGULATOR_STATUS_ON: 317853116a1SDavid Brownell label = "on"; 318853116a1SDavid Brownell break; 319853116a1SDavid Brownell case REGULATOR_STATUS_ERROR: 320853116a1SDavid Brownell label = "error"; 321853116a1SDavid Brownell break; 322853116a1SDavid Brownell case REGULATOR_STATUS_FAST: 323853116a1SDavid Brownell label = "fast"; 324853116a1SDavid Brownell break; 325853116a1SDavid Brownell case REGULATOR_STATUS_NORMAL: 326853116a1SDavid Brownell label = "normal"; 327853116a1SDavid Brownell break; 328853116a1SDavid Brownell case REGULATOR_STATUS_IDLE: 329853116a1SDavid Brownell label = "idle"; 330853116a1SDavid Brownell break; 331853116a1SDavid Brownell case REGULATOR_STATUS_STANDBY: 332853116a1SDavid Brownell label = "standby"; 333853116a1SDavid Brownell break; 334853116a1SDavid Brownell default: 335853116a1SDavid Brownell return -ERANGE; 336853116a1SDavid Brownell } 337853116a1SDavid Brownell 338853116a1SDavid Brownell return sprintf(buf, "%s\n", label); 339853116a1SDavid Brownell } 340853116a1SDavid Brownell static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 341853116a1SDavid Brownell 342414c70cbSLiam Girdwood static ssize_t regulator_min_uA_show(struct device *dev, 343414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 344414c70cbSLiam Girdwood { 345a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 346414c70cbSLiam Girdwood 347414c70cbSLiam Girdwood if (!rdev->constraints) 348414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 349414c70cbSLiam Girdwood 350414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uA); 351414c70cbSLiam Girdwood } 3527ad68e2fSDavid Brownell static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 353414c70cbSLiam Girdwood 354414c70cbSLiam Girdwood static ssize_t regulator_max_uA_show(struct device *dev, 355414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 356414c70cbSLiam Girdwood { 357a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 358414c70cbSLiam Girdwood 359414c70cbSLiam Girdwood if (!rdev->constraints) 360414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 361414c70cbSLiam Girdwood 362414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uA); 363414c70cbSLiam Girdwood } 3647ad68e2fSDavid Brownell static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 365414c70cbSLiam Girdwood 366414c70cbSLiam Girdwood static ssize_t regulator_min_uV_show(struct device *dev, 367414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 368414c70cbSLiam Girdwood { 369a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 370414c70cbSLiam Girdwood 371414c70cbSLiam Girdwood if (!rdev->constraints) 372414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 373414c70cbSLiam Girdwood 374414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uV); 375414c70cbSLiam Girdwood } 3767ad68e2fSDavid Brownell static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 377414c70cbSLiam Girdwood 378414c70cbSLiam Girdwood static ssize_t regulator_max_uV_show(struct device *dev, 379414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 380414c70cbSLiam Girdwood { 381a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 382414c70cbSLiam Girdwood 383414c70cbSLiam Girdwood if (!rdev->constraints) 384414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 385414c70cbSLiam Girdwood 386414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uV); 387414c70cbSLiam Girdwood } 3887ad68e2fSDavid Brownell static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 389414c70cbSLiam Girdwood 390414c70cbSLiam Girdwood static ssize_t regulator_total_uA_show(struct device *dev, 391414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 392414c70cbSLiam Girdwood { 393a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 394414c70cbSLiam Girdwood struct regulator *regulator; 395414c70cbSLiam Girdwood int uA = 0; 396414c70cbSLiam Girdwood 397414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 398414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) 399414c70cbSLiam Girdwood uA += regulator->uA_load; 400414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 401414c70cbSLiam Girdwood return sprintf(buf, "%d\n", uA); 402414c70cbSLiam Girdwood } 4037ad68e2fSDavid Brownell static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 404414c70cbSLiam Girdwood 405414c70cbSLiam Girdwood static ssize_t regulator_num_users_show(struct device *dev, 406414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 407414c70cbSLiam Girdwood { 408a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 409414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->use_count); 410414c70cbSLiam Girdwood } 411414c70cbSLiam Girdwood 412414c70cbSLiam Girdwood static ssize_t regulator_type_show(struct device *dev, 413414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 414414c70cbSLiam Girdwood { 415a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 416414c70cbSLiam Girdwood 417414c70cbSLiam Girdwood switch (rdev->desc->type) { 418414c70cbSLiam Girdwood case REGULATOR_VOLTAGE: 419414c70cbSLiam Girdwood return sprintf(buf, "voltage\n"); 420414c70cbSLiam Girdwood case REGULATOR_CURRENT: 421414c70cbSLiam Girdwood return sprintf(buf, "current\n"); 422414c70cbSLiam Girdwood } 423414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 424414c70cbSLiam Girdwood } 425414c70cbSLiam Girdwood 426414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 427414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 428414c70cbSLiam Girdwood { 429a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 430414c70cbSLiam Girdwood 431414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 432414c70cbSLiam Girdwood } 4337ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_microvolts, 0444, 4347ad68e2fSDavid Brownell regulator_suspend_mem_uV_show, NULL); 435414c70cbSLiam Girdwood 436414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 437414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 438414c70cbSLiam Girdwood { 439a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 440414c70cbSLiam Girdwood 441414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 442414c70cbSLiam Girdwood } 4437ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_microvolts, 0444, 4447ad68e2fSDavid Brownell regulator_suspend_disk_uV_show, NULL); 445414c70cbSLiam Girdwood 446414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 447414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 448414c70cbSLiam Girdwood { 449a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 450414c70cbSLiam Girdwood 451414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 452414c70cbSLiam Girdwood } 4537ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_microvolts, 0444, 4547ad68e2fSDavid Brownell regulator_suspend_standby_uV_show, NULL); 455414c70cbSLiam Girdwood 456414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 457414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 458414c70cbSLiam Girdwood { 459a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 460414c70cbSLiam Girdwood 4614fca9545SDavid Brownell return regulator_print_opmode(buf, 4624fca9545SDavid Brownell rdev->constraints->state_mem.mode); 463414c70cbSLiam Girdwood } 4647ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_mode, 0444, 4657ad68e2fSDavid Brownell regulator_suspend_mem_mode_show, NULL); 466414c70cbSLiam Girdwood 467414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 468414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 469414c70cbSLiam Girdwood { 470a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 471414c70cbSLiam Girdwood 4724fca9545SDavid Brownell return regulator_print_opmode(buf, 4734fca9545SDavid Brownell rdev->constraints->state_disk.mode); 474414c70cbSLiam Girdwood } 4757ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_mode, 0444, 4767ad68e2fSDavid Brownell regulator_suspend_disk_mode_show, NULL); 477414c70cbSLiam Girdwood 478414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 479414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 480414c70cbSLiam Girdwood { 481a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 482414c70cbSLiam Girdwood 4834fca9545SDavid Brownell return regulator_print_opmode(buf, 4844fca9545SDavid Brownell rdev->constraints->state_standby.mode); 485414c70cbSLiam Girdwood } 4867ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_mode, 0444, 4877ad68e2fSDavid Brownell regulator_suspend_standby_mode_show, NULL); 488414c70cbSLiam Girdwood 489414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_state_show(struct device *dev, 490414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 491414c70cbSLiam Girdwood { 492a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 493414c70cbSLiam Girdwood 4944fca9545SDavid Brownell return regulator_print_state(buf, 4954fca9545SDavid Brownell rdev->constraints->state_mem.enabled); 496414c70cbSLiam Girdwood } 4977ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_state, 0444, 4987ad68e2fSDavid Brownell regulator_suspend_mem_state_show, NULL); 499414c70cbSLiam Girdwood 500414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_state_show(struct device *dev, 501414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 502414c70cbSLiam Girdwood { 503a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 504414c70cbSLiam Girdwood 5054fca9545SDavid Brownell return regulator_print_state(buf, 5064fca9545SDavid Brownell rdev->constraints->state_disk.enabled); 507414c70cbSLiam Girdwood } 5087ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_state, 0444, 5097ad68e2fSDavid Brownell regulator_suspend_disk_state_show, NULL); 510414c70cbSLiam Girdwood 511414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_state_show(struct device *dev, 512414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 513414c70cbSLiam Girdwood { 514a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 515414c70cbSLiam Girdwood 5164fca9545SDavid Brownell return regulator_print_state(buf, 5174fca9545SDavid Brownell rdev->constraints->state_standby.enabled); 518414c70cbSLiam Girdwood } 5197ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_state, 0444, 5207ad68e2fSDavid Brownell regulator_suspend_standby_state_show, NULL); 521bc558a60SMark Brown 5227ad68e2fSDavid Brownell 5237ad68e2fSDavid Brownell /* 5247ad68e2fSDavid Brownell * These are the only attributes are present for all regulators. 5257ad68e2fSDavid Brownell * Other attributes are a function of regulator functionality. 5267ad68e2fSDavid Brownell */ 527414c70cbSLiam Girdwood static struct device_attribute regulator_dev_attrs[] = { 528bc558a60SMark Brown __ATTR(name, 0444, regulator_name_show, NULL), 529414c70cbSLiam Girdwood __ATTR(num_users, 0444, regulator_num_users_show, NULL), 530414c70cbSLiam Girdwood __ATTR(type, 0444, regulator_type_show, NULL), 531414c70cbSLiam Girdwood __ATTR_NULL, 532414c70cbSLiam Girdwood }; 533414c70cbSLiam Girdwood 534414c70cbSLiam Girdwood static void regulator_dev_release(struct device *dev) 535414c70cbSLiam Girdwood { 536a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 537414c70cbSLiam Girdwood kfree(rdev); 538414c70cbSLiam Girdwood } 539414c70cbSLiam Girdwood 540414c70cbSLiam Girdwood static struct class regulator_class = { 541414c70cbSLiam Girdwood .name = "regulator", 542414c70cbSLiam Girdwood .dev_release = regulator_dev_release, 543414c70cbSLiam Girdwood .dev_attrs = regulator_dev_attrs, 544414c70cbSLiam Girdwood }; 545414c70cbSLiam Girdwood 546414c70cbSLiam Girdwood /* Calculate the new optimum regulator operating mode based on the new total 547414c70cbSLiam Girdwood * consumer load. All locks held by caller */ 548414c70cbSLiam Girdwood static void drms_uA_update(struct regulator_dev *rdev) 549414c70cbSLiam Girdwood { 550414c70cbSLiam Girdwood struct regulator *sibling; 551414c70cbSLiam Girdwood int current_uA = 0, output_uV, input_uV, err; 552414c70cbSLiam Girdwood unsigned int mode; 553414c70cbSLiam Girdwood 554414c70cbSLiam Girdwood err = regulator_check_drms(rdev); 555414c70cbSLiam Girdwood if (err < 0 || !rdev->desc->ops->get_optimum_mode || 556036de8efSDan Carpenter !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) 557414c70cbSLiam Girdwood return; 558414c70cbSLiam Girdwood 559414c70cbSLiam Girdwood /* get output voltage */ 560414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 561414c70cbSLiam Girdwood if (output_uV <= 0) 562414c70cbSLiam Girdwood return; 563414c70cbSLiam Girdwood 564414c70cbSLiam Girdwood /* get input voltage */ 565414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 566414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 567414c70cbSLiam Girdwood else 568414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 569414c70cbSLiam Girdwood if (input_uV <= 0) 570414c70cbSLiam Girdwood return; 571414c70cbSLiam Girdwood 572414c70cbSLiam Girdwood /* calc total requested load */ 573414c70cbSLiam Girdwood list_for_each_entry(sibling, &rdev->consumer_list, list) 574414c70cbSLiam Girdwood current_uA += sibling->uA_load; 575414c70cbSLiam Girdwood 576414c70cbSLiam Girdwood /* now get the optimum mode for our new total regulator load */ 577414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 578414c70cbSLiam Girdwood output_uV, current_uA); 579414c70cbSLiam Girdwood 580414c70cbSLiam Girdwood /* check the new mode is allowed */ 581414c70cbSLiam Girdwood err = regulator_check_mode(rdev, mode); 582414c70cbSLiam Girdwood if (err == 0) 583414c70cbSLiam Girdwood rdev->desc->ops->set_mode(rdev, mode); 584414c70cbSLiam Girdwood } 585414c70cbSLiam Girdwood 586414c70cbSLiam Girdwood static int suspend_set_state(struct regulator_dev *rdev, 587414c70cbSLiam Girdwood struct regulator_state *rstate) 588414c70cbSLiam Girdwood { 589414c70cbSLiam Girdwood int ret = 0; 590638f85c5SMark Brown bool can_set_state; 591414c70cbSLiam Girdwood 592638f85c5SMark Brown can_set_state = rdev->desc->ops->set_suspend_enable && 593638f85c5SMark Brown rdev->desc->ops->set_suspend_disable; 594638f85c5SMark Brown 595638f85c5SMark Brown /* If we have no suspend mode configration don't set anything; 596638f85c5SMark Brown * only warn if the driver actually makes the suspend mode 597638f85c5SMark Brown * configurable. 598638f85c5SMark Brown */ 599638f85c5SMark Brown if (!rstate->enabled && !rstate->disabled) { 600638f85c5SMark Brown if (can_set_state) 601638f85c5SMark Brown printk(KERN_WARNING "%s: No configuration for %s\n", 602638f85c5SMark Brown __func__, rdev_get_name(rdev)); 603638f85c5SMark Brown return 0; 604638f85c5SMark Brown } 605638f85c5SMark Brown 606638f85c5SMark Brown if (rstate->enabled && rstate->disabled) { 607638f85c5SMark Brown printk(KERN_ERR "%s: invalid configuration for %s\n", 608638f85c5SMark Brown __func__, rdev_get_name(rdev)); 609638f85c5SMark Brown return -EINVAL; 610638f85c5SMark Brown } 611638f85c5SMark Brown 612638f85c5SMark Brown if (!can_set_state) { 613a5766f11SLiam Girdwood printk(KERN_ERR "%s: no way to set suspend state\n", 614a5766f11SLiam Girdwood __func__); 615414c70cbSLiam Girdwood return -EINVAL; 616a5766f11SLiam Girdwood } 617414c70cbSLiam Girdwood 618414c70cbSLiam Girdwood if (rstate->enabled) 619414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_enable(rdev); 620414c70cbSLiam Girdwood else 621414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_disable(rdev); 622414c70cbSLiam Girdwood if (ret < 0) { 623414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 624414c70cbSLiam Girdwood return ret; 625414c70cbSLiam Girdwood } 626414c70cbSLiam Girdwood 627414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 628414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 629414c70cbSLiam Girdwood if (ret < 0) { 630414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set voltage\n", 631414c70cbSLiam Girdwood __func__); 632414c70cbSLiam Girdwood return ret; 633414c70cbSLiam Girdwood } 634414c70cbSLiam Girdwood } 635414c70cbSLiam Girdwood 636414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 637414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 638414c70cbSLiam Girdwood if (ret < 0) { 639414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set mode\n", __func__); 640414c70cbSLiam Girdwood return ret; 641414c70cbSLiam Girdwood } 642414c70cbSLiam Girdwood } 643414c70cbSLiam Girdwood return ret; 644414c70cbSLiam Girdwood } 645414c70cbSLiam Girdwood 646414c70cbSLiam Girdwood /* locks held by caller */ 647414c70cbSLiam Girdwood static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 648414c70cbSLiam Girdwood { 649414c70cbSLiam Girdwood if (!rdev->constraints) 650414c70cbSLiam Girdwood return -EINVAL; 651414c70cbSLiam Girdwood 652414c70cbSLiam Girdwood switch (state) { 653414c70cbSLiam Girdwood case PM_SUSPEND_STANDBY: 654414c70cbSLiam Girdwood return suspend_set_state(rdev, 655414c70cbSLiam Girdwood &rdev->constraints->state_standby); 656414c70cbSLiam Girdwood case PM_SUSPEND_MEM: 657414c70cbSLiam Girdwood return suspend_set_state(rdev, 658414c70cbSLiam Girdwood &rdev->constraints->state_mem); 659414c70cbSLiam Girdwood case PM_SUSPEND_MAX: 660414c70cbSLiam Girdwood return suspend_set_state(rdev, 661414c70cbSLiam Girdwood &rdev->constraints->state_disk); 662414c70cbSLiam Girdwood default: 663414c70cbSLiam Girdwood return -EINVAL; 664414c70cbSLiam Girdwood } 665414c70cbSLiam Girdwood } 666414c70cbSLiam Girdwood 667414c70cbSLiam Girdwood static void print_constraints(struct regulator_dev *rdev) 668414c70cbSLiam Girdwood { 669414c70cbSLiam Girdwood struct regulation_constraints *constraints = rdev->constraints; 670973e9a27SMark Brown char buf[80] = ""; 6718f031b48SMark Brown int count = 0; 6728f031b48SMark Brown int ret; 673414c70cbSLiam Girdwood 6748f031b48SMark Brown if (constraints->min_uV && constraints->max_uV) { 675414c70cbSLiam Girdwood if (constraints->min_uV == constraints->max_uV) 6768f031b48SMark Brown count += sprintf(buf + count, "%d mV ", 677414c70cbSLiam Girdwood constraints->min_uV / 1000); 678414c70cbSLiam Girdwood else 6798f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mV ", 680414c70cbSLiam Girdwood constraints->min_uV / 1000, 681414c70cbSLiam Girdwood constraints->max_uV / 1000); 6828f031b48SMark Brown } 6838f031b48SMark Brown 6848f031b48SMark Brown if (!constraints->min_uV || 6858f031b48SMark Brown constraints->min_uV != constraints->max_uV) { 6868f031b48SMark Brown ret = _regulator_get_voltage(rdev); 6878f031b48SMark Brown if (ret > 0) 6888f031b48SMark Brown count += sprintf(buf + count, "at %d mV ", ret / 1000); 6898f031b48SMark Brown } 6908f031b48SMark Brown 6918f031b48SMark Brown if (constraints->min_uA && constraints->max_uA) { 692414c70cbSLiam Girdwood if (constraints->min_uA == constraints->max_uA) 6938f031b48SMark Brown count += sprintf(buf + count, "%d mA ", 694414c70cbSLiam Girdwood constraints->min_uA / 1000); 695414c70cbSLiam Girdwood else 6968f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mA ", 697414c70cbSLiam Girdwood constraints->min_uA / 1000, 698414c70cbSLiam Girdwood constraints->max_uA / 1000); 699414c70cbSLiam Girdwood } 7008f031b48SMark Brown 7018f031b48SMark Brown if (!constraints->min_uA || 7028f031b48SMark Brown constraints->min_uA != constraints->max_uA) { 7038f031b48SMark Brown ret = _regulator_get_current_limit(rdev); 7048f031b48SMark Brown if (ret > 0) 705e4a6376bSCyril Chemparathy count += sprintf(buf + count, "at %d mA ", ret / 1000); 7068f031b48SMark Brown } 7078f031b48SMark Brown 708414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 709414c70cbSLiam Girdwood count += sprintf(buf + count, "fast "); 710414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 711414c70cbSLiam Girdwood count += sprintf(buf + count, "normal "); 712414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 713414c70cbSLiam Girdwood count += sprintf(buf + count, "idle "); 714414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 715414c70cbSLiam Girdwood count += sprintf(buf + count, "standby"); 716414c70cbSLiam Girdwood 7171083c393SMark Brown printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); 718414c70cbSLiam Girdwood } 719414c70cbSLiam Girdwood 720e79055d6SMark Brown static int machine_constraints_voltage(struct regulator_dev *rdev, 7211083c393SMark Brown struct regulation_constraints *constraints) 722e79055d6SMark Brown { 723e79055d6SMark Brown struct regulator_ops *ops = rdev->desc->ops; 7241083c393SMark Brown const char *name = rdev_get_name(rdev); 725af5866c9SMark Brown int ret; 726af5866c9SMark Brown 727af5866c9SMark Brown /* do we need to apply the constraint voltage */ 728af5866c9SMark Brown if (rdev->constraints->apply_uV && 729af5866c9SMark Brown rdev->constraints->min_uV == rdev->constraints->max_uV && 730af5866c9SMark Brown ops->set_voltage) { 731af5866c9SMark Brown ret = ops->set_voltage(rdev, 732af5866c9SMark Brown rdev->constraints->min_uV, rdev->constraints->max_uV); 733af5866c9SMark Brown if (ret < 0) { 734af5866c9SMark Brown printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 735af5866c9SMark Brown __func__, 736af5866c9SMark Brown rdev->constraints->min_uV, name); 737af5866c9SMark Brown rdev->constraints = NULL; 738af5866c9SMark Brown return ret; 739af5866c9SMark Brown } 740af5866c9SMark Brown } 741e79055d6SMark Brown 742e79055d6SMark Brown /* constrain machine-level voltage specs to fit 743e79055d6SMark Brown * the actual range supported by this regulator. 744e79055d6SMark Brown */ 745e79055d6SMark Brown if (ops->list_voltage && rdev->desc->n_voltages) { 746e79055d6SMark Brown int count = rdev->desc->n_voltages; 747e79055d6SMark Brown int i; 748e79055d6SMark Brown int min_uV = INT_MAX; 749e79055d6SMark Brown int max_uV = INT_MIN; 750e79055d6SMark Brown int cmin = constraints->min_uV; 751e79055d6SMark Brown int cmax = constraints->max_uV; 752e79055d6SMark Brown 753e79055d6SMark Brown /* it's safe to autoconfigure fixed-voltage supplies 754e79055d6SMark Brown and the constraints are used by list_voltage. */ 755e79055d6SMark Brown if (count == 1 && !cmin) { 756e79055d6SMark Brown cmin = 1; 757e79055d6SMark Brown cmax = INT_MAX; 758e79055d6SMark Brown constraints->min_uV = cmin; 759e79055d6SMark Brown constraints->max_uV = cmax; 760e79055d6SMark Brown } 761e79055d6SMark Brown 762e79055d6SMark Brown /* voltage constraints are optional */ 763e79055d6SMark Brown if ((cmin == 0) && (cmax == 0)) 764e79055d6SMark Brown return 0; 765e79055d6SMark Brown 766e79055d6SMark Brown /* else require explicit machine-level constraints */ 767e79055d6SMark Brown if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 768e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 769e79055d6SMark Brown __func__, "invalid", name); 770e79055d6SMark Brown return -EINVAL; 771e79055d6SMark Brown } 772e79055d6SMark Brown 773e79055d6SMark Brown /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 774e79055d6SMark Brown for (i = 0; i < count; i++) { 775e79055d6SMark Brown int value; 776e79055d6SMark Brown 777e79055d6SMark Brown value = ops->list_voltage(rdev, i); 778e79055d6SMark Brown if (value <= 0) 779e79055d6SMark Brown continue; 780e79055d6SMark Brown 781e79055d6SMark Brown /* maybe adjust [min_uV..max_uV] */ 782e79055d6SMark Brown if (value >= cmin && value < min_uV) 783e79055d6SMark Brown min_uV = value; 784e79055d6SMark Brown if (value <= cmax && value > max_uV) 785e79055d6SMark Brown max_uV = value; 786e79055d6SMark Brown } 787e79055d6SMark Brown 788e79055d6SMark Brown /* final: [min_uV..max_uV] valid iff constraints valid */ 789e79055d6SMark Brown if (max_uV < min_uV) { 790e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 791e79055d6SMark Brown __func__, "unsupportable", name); 792e79055d6SMark Brown return -EINVAL; 793e79055d6SMark Brown } 794e79055d6SMark Brown 795e79055d6SMark Brown /* use regulator's subset of machine constraints */ 796e79055d6SMark Brown if (constraints->min_uV < min_uV) { 797e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 798e79055d6SMark Brown __func__, name, "min_uV", 799e79055d6SMark Brown constraints->min_uV, min_uV); 800e79055d6SMark Brown constraints->min_uV = min_uV; 801e79055d6SMark Brown } 802e79055d6SMark Brown if (constraints->max_uV > max_uV) { 803e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 804e79055d6SMark Brown __func__, name, "max_uV", 805e79055d6SMark Brown constraints->max_uV, max_uV); 806e79055d6SMark Brown constraints->max_uV = max_uV; 807e79055d6SMark Brown } 808e79055d6SMark Brown } 809e79055d6SMark Brown 810e79055d6SMark Brown return 0; 811e79055d6SMark Brown } 812e79055d6SMark Brown 813a5766f11SLiam Girdwood /** 814a5766f11SLiam Girdwood * set_machine_constraints - sets regulator constraints 81569279fb9SMark Brown * @rdev: regulator source 816c8e7e464SMark Brown * @constraints: constraints to apply 817a5766f11SLiam Girdwood * 818a5766f11SLiam Girdwood * Allows platform initialisation code to define and constrain 819a5766f11SLiam Girdwood * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 820a5766f11SLiam Girdwood * Constraints *must* be set by platform code in order for some 821a5766f11SLiam Girdwood * regulator operations to proceed i.e. set_voltage, set_current_limit, 822a5766f11SLiam Girdwood * set_mode. 823a5766f11SLiam Girdwood */ 824a5766f11SLiam Girdwood static int set_machine_constraints(struct regulator_dev *rdev, 825a5766f11SLiam Girdwood struct regulation_constraints *constraints) 826a5766f11SLiam Girdwood { 827a5766f11SLiam Girdwood int ret = 0; 828e06f5b4fSMark Brown const char *name; 829e5fda26cSMark Brown struct regulator_ops *ops = rdev->desc->ops; 830e06f5b4fSMark Brown 831af5866c9SMark Brown rdev->constraints = constraints; 832af5866c9SMark Brown 8331083c393SMark Brown name = rdev_get_name(rdev); 8341083c393SMark Brown 8351083c393SMark Brown ret = machine_constraints_voltage(rdev, constraints); 836e79055d6SMark Brown if (ret != 0) 8373e2b9abdSMark Brown goto out; 8383e2b9abdSMark Brown 839a5766f11SLiam Girdwood /* do we need to setup our suspend state */ 840e06f5b4fSMark Brown if (constraints->initial_state) { 841a5766f11SLiam Girdwood ret = suspend_prepare(rdev, constraints->initial_state); 842e06f5b4fSMark Brown if (ret < 0) { 843e06f5b4fSMark Brown printk(KERN_ERR "%s: failed to set suspend state for %s\n", 844e06f5b4fSMark Brown __func__, name); 845e06f5b4fSMark Brown rdev->constraints = NULL; 846e06f5b4fSMark Brown goto out; 847e06f5b4fSMark Brown } 848e06f5b4fSMark Brown } 849a5766f11SLiam Girdwood 850a308466cSMark Brown if (constraints->initial_mode) { 851a308466cSMark Brown if (!ops->set_mode) { 852a308466cSMark Brown printk(KERN_ERR "%s: no set_mode operation for %s\n", 853a308466cSMark Brown __func__, name); 854a308466cSMark Brown ret = -EINVAL; 855a308466cSMark Brown goto out; 856a308466cSMark Brown } 857a308466cSMark Brown 858a308466cSMark Brown ret = ops->set_mode(rdev, constraints->initial_mode); 859a308466cSMark Brown if (ret < 0) { 860a308466cSMark Brown printk(KERN_ERR 861a308466cSMark Brown "%s: failed to set initial mode for %s: %d\n", 862a308466cSMark Brown __func__, name, ret); 863a308466cSMark Brown goto out; 864a308466cSMark Brown } 865a308466cSMark Brown } 866a308466cSMark Brown 867cacf90f2SMark Brown /* If the constraints say the regulator should be on at this point 868cacf90f2SMark Brown * and we have control then make sure it is enabled. 869cacf90f2SMark Brown */ 870cacf90f2SMark Brown if ((constraints->always_on || constraints->boot_on) && ops->enable) { 871e5fda26cSMark Brown ret = ops->enable(rdev); 872e5fda26cSMark Brown if (ret < 0) { 873e5fda26cSMark Brown printk(KERN_ERR "%s: failed to enable %s\n", 874e5fda26cSMark Brown __func__, name); 875e5fda26cSMark Brown rdev->constraints = NULL; 876e5fda26cSMark Brown goto out; 877e5fda26cSMark Brown } 878e5fda26cSMark Brown } 879e5fda26cSMark Brown 880a5766f11SLiam Girdwood print_constraints(rdev); 881a5766f11SLiam Girdwood out: 882a5766f11SLiam Girdwood return ret; 883a5766f11SLiam Girdwood } 884a5766f11SLiam Girdwood 885a5766f11SLiam Girdwood /** 886a5766f11SLiam Girdwood * set_supply - set regulator supply regulator 88769279fb9SMark Brown * @rdev: regulator name 88869279fb9SMark Brown * @supply_rdev: supply regulator name 889a5766f11SLiam Girdwood * 890a5766f11SLiam Girdwood * Called by platform initialisation code to set the supply regulator for this 891a5766f11SLiam Girdwood * regulator. This ensures that a regulators supply will also be enabled by the 892a5766f11SLiam Girdwood * core if it's child is enabled. 893a5766f11SLiam Girdwood */ 894a5766f11SLiam Girdwood static int set_supply(struct regulator_dev *rdev, 895a5766f11SLiam Girdwood struct regulator_dev *supply_rdev) 896a5766f11SLiam Girdwood { 897a5766f11SLiam Girdwood int err; 898a5766f11SLiam Girdwood 899a5766f11SLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 900a5766f11SLiam Girdwood "supply"); 901a5766f11SLiam Girdwood if (err) { 902a5766f11SLiam Girdwood printk(KERN_ERR 903a5766f11SLiam Girdwood "%s: could not add device link %s err %d\n", 904a5766f11SLiam Girdwood __func__, supply_rdev->dev.kobj.name, err); 905a5766f11SLiam Girdwood goto out; 906a5766f11SLiam Girdwood } 907a5766f11SLiam Girdwood rdev->supply = supply_rdev; 908a5766f11SLiam Girdwood list_add(&rdev->slist, &supply_rdev->supply_list); 909a5766f11SLiam Girdwood out: 910a5766f11SLiam Girdwood return err; 911a5766f11SLiam Girdwood } 912a5766f11SLiam Girdwood 913a5766f11SLiam Girdwood /** 914a5766f11SLiam Girdwood * set_consumer_device_supply: Bind a regulator to a symbolic supply 91569279fb9SMark Brown * @rdev: regulator source 91669279fb9SMark Brown * @consumer_dev: device the supply applies to 91740f9244fSMark Brown * @consumer_dev_name: dev_name() string for device supply applies to 918a5766f11SLiam Girdwood * @supply: symbolic name for supply 919a5766f11SLiam Girdwood * 920a5766f11SLiam Girdwood * Allows platform initialisation code to map physical regulator 921a5766f11SLiam Girdwood * sources to symbolic names for supplies for use by devices. Devices 922a5766f11SLiam Girdwood * should use these symbolic names to request regulators, avoiding the 923a5766f11SLiam Girdwood * need to provide board-specific regulator names as platform data. 92440f9244fSMark Brown * 92540f9244fSMark Brown * Only one of consumer_dev and consumer_dev_name may be specified. 926a5766f11SLiam Girdwood */ 927a5766f11SLiam Girdwood static int set_consumer_device_supply(struct regulator_dev *rdev, 92840f9244fSMark Brown struct device *consumer_dev, const char *consumer_dev_name, 92940f9244fSMark Brown const char *supply) 930a5766f11SLiam Girdwood { 931a5766f11SLiam Girdwood struct regulator_map *node; 9329ed2099eSMark Brown int has_dev; 933a5766f11SLiam Girdwood 93440f9244fSMark Brown if (consumer_dev && consumer_dev_name) 93540f9244fSMark Brown return -EINVAL; 93640f9244fSMark Brown 93740f9244fSMark Brown if (!consumer_dev_name && consumer_dev) 93840f9244fSMark Brown consumer_dev_name = dev_name(consumer_dev); 93940f9244fSMark Brown 940a5766f11SLiam Girdwood if (supply == NULL) 941a5766f11SLiam Girdwood return -EINVAL; 942a5766f11SLiam Girdwood 9439ed2099eSMark Brown if (consumer_dev_name != NULL) 9449ed2099eSMark Brown has_dev = 1; 9459ed2099eSMark Brown else 9469ed2099eSMark Brown has_dev = 0; 9479ed2099eSMark Brown 9486001e13cSDavid Brownell list_for_each_entry(node, ®ulator_map_list, list) { 94923b5cc2aSJani Nikula if (node->dev_name && consumer_dev_name) { 95023b5cc2aSJani Nikula if (strcmp(node->dev_name, consumer_dev_name) != 0) 9516001e13cSDavid Brownell continue; 95223b5cc2aSJani Nikula } else if (node->dev_name || consumer_dev_name) { 95323b5cc2aSJani Nikula continue; 95423b5cc2aSJani Nikula } 95523b5cc2aSJani Nikula 9566001e13cSDavid Brownell if (strcmp(node->supply, supply) != 0) 9576001e13cSDavid Brownell continue; 9586001e13cSDavid Brownell 9596001e13cSDavid Brownell dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 9606001e13cSDavid Brownell dev_name(&node->regulator->dev), 9616001e13cSDavid Brownell node->regulator->desc->name, 9626001e13cSDavid Brownell supply, 9631083c393SMark Brown dev_name(&rdev->dev), rdev_get_name(rdev)); 9646001e13cSDavid Brownell return -EBUSY; 9656001e13cSDavid Brownell } 9666001e13cSDavid Brownell 9679ed2099eSMark Brown node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 968a5766f11SLiam Girdwood if (node == NULL) 969a5766f11SLiam Girdwood return -ENOMEM; 970a5766f11SLiam Girdwood 971a5766f11SLiam Girdwood node->regulator = rdev; 972a5766f11SLiam Girdwood node->supply = supply; 973a5766f11SLiam Girdwood 9749ed2099eSMark Brown if (has_dev) { 9759ed2099eSMark Brown node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 97640f9244fSMark Brown if (node->dev_name == NULL) { 97740f9244fSMark Brown kfree(node); 97840f9244fSMark Brown return -ENOMEM; 97940f9244fSMark Brown } 9809ed2099eSMark Brown } 98140f9244fSMark Brown 982a5766f11SLiam Girdwood list_add(&node->list, ®ulator_map_list); 983a5766f11SLiam Girdwood return 0; 984a5766f11SLiam Girdwood } 985a5766f11SLiam Girdwood 9860f1d747bSMike Rapoport static void unset_regulator_supplies(struct regulator_dev *rdev) 9870f1d747bSMike Rapoport { 9880f1d747bSMike Rapoport struct regulator_map *node, *n; 9890f1d747bSMike Rapoport 9900f1d747bSMike Rapoport list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 9910f1d747bSMike Rapoport if (rdev == node->regulator) { 9920f1d747bSMike Rapoport list_del(&node->list); 99340f9244fSMark Brown kfree(node->dev_name); 9940f1d747bSMike Rapoport kfree(node); 9950f1d747bSMike Rapoport } 9960f1d747bSMike Rapoport } 9970f1d747bSMike Rapoport } 9980f1d747bSMike Rapoport 999414c70cbSLiam Girdwood #define REG_STR_SIZE 32 1000414c70cbSLiam Girdwood 1001414c70cbSLiam Girdwood static struct regulator *create_regulator(struct regulator_dev *rdev, 1002414c70cbSLiam Girdwood struct device *dev, 1003414c70cbSLiam Girdwood const char *supply_name) 1004414c70cbSLiam Girdwood { 1005414c70cbSLiam Girdwood struct regulator *regulator; 1006414c70cbSLiam Girdwood char buf[REG_STR_SIZE]; 1007414c70cbSLiam Girdwood int err, size; 1008414c70cbSLiam Girdwood 1009414c70cbSLiam Girdwood regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1010414c70cbSLiam Girdwood if (regulator == NULL) 1011414c70cbSLiam Girdwood return NULL; 1012414c70cbSLiam Girdwood 1013414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1014414c70cbSLiam Girdwood regulator->rdev = rdev; 1015414c70cbSLiam Girdwood list_add(®ulator->list, &rdev->consumer_list); 1016414c70cbSLiam Girdwood 1017414c70cbSLiam Girdwood if (dev) { 1018414c70cbSLiam Girdwood /* create a 'requested_microamps_name' sysfs entry */ 1019414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1020414c70cbSLiam Girdwood supply_name); 1021414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1022414c70cbSLiam Girdwood goto overflow_err; 1023414c70cbSLiam Girdwood 1024414c70cbSLiam Girdwood regulator->dev = dev; 10254f26a2abSAmeya Palande sysfs_attr_init(®ulator->dev_attr.attr); 1026414c70cbSLiam Girdwood regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1027414c70cbSLiam Girdwood if (regulator->dev_attr.attr.name == NULL) 1028414c70cbSLiam Girdwood goto attr_name_err; 1029414c70cbSLiam Girdwood 1030414c70cbSLiam Girdwood regulator->dev_attr.attr.mode = 0444; 1031414c70cbSLiam Girdwood regulator->dev_attr.show = device_requested_uA_show; 1032414c70cbSLiam Girdwood err = device_create_file(dev, ®ulator->dev_attr); 1033414c70cbSLiam Girdwood if (err < 0) { 1034414c70cbSLiam Girdwood printk(KERN_WARNING "%s: could not add regulator_dev" 1035414c70cbSLiam Girdwood " load sysfs\n", __func__); 1036414c70cbSLiam Girdwood goto attr_name_err; 1037414c70cbSLiam Girdwood } 1038414c70cbSLiam Girdwood 1039414c70cbSLiam Girdwood /* also add a link to the device sysfs entry */ 1040414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1041414c70cbSLiam Girdwood dev->kobj.name, supply_name); 1042414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1043414c70cbSLiam Girdwood goto attr_err; 1044414c70cbSLiam Girdwood 1045414c70cbSLiam Girdwood regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1046414c70cbSLiam Girdwood if (regulator->supply_name == NULL) 1047414c70cbSLiam Girdwood goto attr_err; 1048414c70cbSLiam Girdwood 1049414c70cbSLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1050414c70cbSLiam Girdwood buf); 1051414c70cbSLiam Girdwood if (err) { 1052414c70cbSLiam Girdwood printk(KERN_WARNING 1053414c70cbSLiam Girdwood "%s: could not add device link %s err %d\n", 1054414c70cbSLiam Girdwood __func__, dev->kobj.name, err); 1055414c70cbSLiam Girdwood goto link_name_err; 1056414c70cbSLiam Girdwood } 1057414c70cbSLiam Girdwood } 1058414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1059414c70cbSLiam Girdwood return regulator; 1060414c70cbSLiam Girdwood link_name_err: 1061414c70cbSLiam Girdwood kfree(regulator->supply_name); 1062414c70cbSLiam Girdwood attr_err: 1063414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1064414c70cbSLiam Girdwood attr_name_err: 1065414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1066414c70cbSLiam Girdwood overflow_err: 1067414c70cbSLiam Girdwood list_del(®ulator->list); 1068414c70cbSLiam Girdwood kfree(regulator); 1069414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1070414c70cbSLiam Girdwood return NULL; 1071414c70cbSLiam Girdwood } 1072414c70cbSLiam Girdwood 107331aae2beSMark Brown static int _regulator_get_enable_time(struct regulator_dev *rdev) 107431aae2beSMark Brown { 107531aae2beSMark Brown if (!rdev->desc->ops->enable_time) 107631aae2beSMark Brown return 0; 107731aae2beSMark Brown return rdev->desc->ops->enable_time(rdev); 107831aae2beSMark Brown } 107931aae2beSMark Brown 10805ffbd136SMark Brown /* Internal regulator request function */ 10815ffbd136SMark Brown static struct regulator *_regulator_get(struct device *dev, const char *id, 10825ffbd136SMark Brown int exclusive) 1083414c70cbSLiam Girdwood { 1084414c70cbSLiam Girdwood struct regulator_dev *rdev; 1085414c70cbSLiam Girdwood struct regulator_map *map; 1086414c70cbSLiam Girdwood struct regulator *regulator = ERR_PTR(-ENODEV); 108740f9244fSMark Brown const char *devname = NULL; 10885ffbd136SMark Brown int ret; 1089414c70cbSLiam Girdwood 1090414c70cbSLiam Girdwood if (id == NULL) { 1091414c70cbSLiam Girdwood printk(KERN_ERR "regulator: get() with no identifier\n"); 1092414c70cbSLiam Girdwood return regulator; 1093414c70cbSLiam Girdwood } 1094414c70cbSLiam Girdwood 109540f9244fSMark Brown if (dev) 109640f9244fSMark Brown devname = dev_name(dev); 109740f9244fSMark Brown 1098414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1099414c70cbSLiam Girdwood 1100414c70cbSLiam Girdwood list_for_each_entry(map, ®ulator_map_list, list) { 110140f9244fSMark Brown /* If the mapping has a device set up it must match */ 110240f9244fSMark Brown if (map->dev_name && 110340f9244fSMark Brown (!devname || strcmp(map->dev_name, devname))) 110440f9244fSMark Brown continue; 110540f9244fSMark Brown 110640f9244fSMark Brown if (strcmp(map->supply, id) == 0) { 1107a5766f11SLiam Girdwood rdev = map->regulator; 1108414c70cbSLiam Girdwood goto found; 1109414c70cbSLiam Girdwood } 1110a5766f11SLiam Girdwood } 111134abbd68SMark Brown 1112688fe99aSMark Brown if (board_wants_dummy_regulator) { 1113688fe99aSMark Brown rdev = dummy_regulator_rdev; 1114688fe99aSMark Brown goto found; 1115688fe99aSMark Brown } 1116688fe99aSMark Brown 111734abbd68SMark Brown #ifdef CONFIG_REGULATOR_DUMMY 111834abbd68SMark Brown if (!devname) 111934abbd68SMark Brown devname = "deviceless"; 112034abbd68SMark Brown 112134abbd68SMark Brown /* If the board didn't flag that it was fully constrained then 112234abbd68SMark Brown * substitute in a dummy regulator so consumers can continue. 112334abbd68SMark Brown */ 112434abbd68SMark Brown if (!has_full_constraints) { 112534abbd68SMark Brown pr_warning("%s supply %s not found, using dummy regulator\n", 112634abbd68SMark Brown devname, id); 112734abbd68SMark Brown rdev = dummy_regulator_rdev; 112834abbd68SMark Brown goto found; 112934abbd68SMark Brown } 113034abbd68SMark Brown #endif 113134abbd68SMark Brown 1132414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1133414c70cbSLiam Girdwood return regulator; 1134414c70cbSLiam Girdwood 1135414c70cbSLiam Girdwood found: 11365ffbd136SMark Brown if (rdev->exclusive) { 11375ffbd136SMark Brown regulator = ERR_PTR(-EPERM); 11385ffbd136SMark Brown goto out; 11395ffbd136SMark Brown } 11405ffbd136SMark Brown 11415ffbd136SMark Brown if (exclusive && rdev->open_count) { 11425ffbd136SMark Brown regulator = ERR_PTR(-EBUSY); 11435ffbd136SMark Brown goto out; 11445ffbd136SMark Brown } 11455ffbd136SMark Brown 1146a5766f11SLiam Girdwood if (!try_module_get(rdev->owner)) 1147a5766f11SLiam Girdwood goto out; 1148a5766f11SLiam Girdwood 1149414c70cbSLiam Girdwood regulator = create_regulator(rdev, dev, id); 1150414c70cbSLiam Girdwood if (regulator == NULL) { 1151414c70cbSLiam Girdwood regulator = ERR_PTR(-ENOMEM); 1152414c70cbSLiam Girdwood module_put(rdev->owner); 1153414c70cbSLiam Girdwood } 1154414c70cbSLiam Girdwood 11555ffbd136SMark Brown rdev->open_count++; 11565ffbd136SMark Brown if (exclusive) { 11575ffbd136SMark Brown rdev->exclusive = 1; 11585ffbd136SMark Brown 11595ffbd136SMark Brown ret = _regulator_is_enabled(rdev); 11605ffbd136SMark Brown if (ret > 0) 11615ffbd136SMark Brown rdev->use_count = 1; 11625ffbd136SMark Brown else 11635ffbd136SMark Brown rdev->use_count = 0; 11645ffbd136SMark Brown } 11655ffbd136SMark Brown 1166a5766f11SLiam Girdwood out: 1167414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 11685ffbd136SMark Brown 1169414c70cbSLiam Girdwood return regulator; 1170414c70cbSLiam Girdwood } 11715ffbd136SMark Brown 11725ffbd136SMark Brown /** 11735ffbd136SMark Brown * regulator_get - lookup and obtain a reference to a regulator. 11745ffbd136SMark Brown * @dev: device for regulator "consumer" 11755ffbd136SMark Brown * @id: Supply name or regulator ID. 11765ffbd136SMark Brown * 11775ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 11785ffbd136SMark Brown * or IS_ERR() condition containing errno. 11795ffbd136SMark Brown * 11805ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 11815ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 11825ffbd136SMark Brown * should match the name used for the supply and/or the relevant 11835ffbd136SMark Brown * device pins in the datasheet. 11845ffbd136SMark Brown */ 11855ffbd136SMark Brown struct regulator *regulator_get(struct device *dev, const char *id) 11865ffbd136SMark Brown { 11875ffbd136SMark Brown return _regulator_get(dev, id, 0); 11885ffbd136SMark Brown } 1189414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get); 1190414c70cbSLiam Girdwood 1191414c70cbSLiam Girdwood /** 11925ffbd136SMark Brown * regulator_get_exclusive - obtain exclusive access to a regulator. 11935ffbd136SMark Brown * @dev: device for regulator "consumer" 11945ffbd136SMark Brown * @id: Supply name or regulator ID. 11955ffbd136SMark Brown * 11965ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 11975ffbd136SMark Brown * or IS_ERR() condition containing errno. Other consumers will be 11985ffbd136SMark Brown * unable to obtain this reference is held and the use count for the 11995ffbd136SMark Brown * regulator will be initialised to reflect the current state of the 12005ffbd136SMark Brown * regulator. 12015ffbd136SMark Brown * 12025ffbd136SMark Brown * This is intended for use by consumers which cannot tolerate shared 12035ffbd136SMark Brown * use of the regulator such as those which need to force the 12045ffbd136SMark Brown * regulator off for correct operation of the hardware they are 12055ffbd136SMark Brown * controlling. 12065ffbd136SMark Brown * 12075ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 12085ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 12095ffbd136SMark Brown * should match the name used for the supply and/or the relevant 12105ffbd136SMark Brown * device pins in the datasheet. 12115ffbd136SMark Brown */ 12125ffbd136SMark Brown struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 12135ffbd136SMark Brown { 12145ffbd136SMark Brown return _regulator_get(dev, id, 1); 12155ffbd136SMark Brown } 12165ffbd136SMark Brown EXPORT_SYMBOL_GPL(regulator_get_exclusive); 12175ffbd136SMark Brown 12185ffbd136SMark Brown /** 1219414c70cbSLiam Girdwood * regulator_put - "free" the regulator source 1220414c70cbSLiam Girdwood * @regulator: regulator source 1221414c70cbSLiam Girdwood * 1222414c70cbSLiam Girdwood * Note: drivers must ensure that all regulator_enable calls made on this 1223414c70cbSLiam Girdwood * regulator source are balanced by regulator_disable calls prior to calling 1224414c70cbSLiam Girdwood * this function. 1225414c70cbSLiam Girdwood */ 1226414c70cbSLiam Girdwood void regulator_put(struct regulator *regulator) 1227414c70cbSLiam Girdwood { 1228414c70cbSLiam Girdwood struct regulator_dev *rdev; 1229414c70cbSLiam Girdwood 1230414c70cbSLiam Girdwood if (regulator == NULL || IS_ERR(regulator)) 1231414c70cbSLiam Girdwood return; 1232414c70cbSLiam Girdwood 1233414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1234414c70cbSLiam Girdwood rdev = regulator->rdev; 1235414c70cbSLiam Girdwood 1236414c70cbSLiam Girdwood /* remove any sysfs entries */ 1237414c70cbSLiam Girdwood if (regulator->dev) { 1238414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1239414c70cbSLiam Girdwood kfree(regulator->supply_name); 1240414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1241414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1242414c70cbSLiam Girdwood } 1243414c70cbSLiam Girdwood list_del(®ulator->list); 1244414c70cbSLiam Girdwood kfree(regulator); 1245414c70cbSLiam Girdwood 12465ffbd136SMark Brown rdev->open_count--; 12475ffbd136SMark Brown rdev->exclusive = 0; 12485ffbd136SMark Brown 1249414c70cbSLiam Girdwood module_put(rdev->owner); 1250414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1251414c70cbSLiam Girdwood } 1252414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_put); 1253414c70cbSLiam Girdwood 12549a2372faSMark Brown static int _regulator_can_change_status(struct regulator_dev *rdev) 12559a2372faSMark Brown { 12569a2372faSMark Brown if (!rdev->constraints) 12579a2372faSMark Brown return 0; 12589a2372faSMark Brown 12599a2372faSMark Brown if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 12609a2372faSMark Brown return 1; 12619a2372faSMark Brown else 12629a2372faSMark Brown return 0; 12639a2372faSMark Brown } 12649a2372faSMark Brown 1265414c70cbSLiam Girdwood /* locks held by regulator_enable() */ 1266414c70cbSLiam Girdwood static int _regulator_enable(struct regulator_dev *rdev) 1267414c70cbSLiam Girdwood { 126831aae2beSMark Brown int ret, delay; 1269414c70cbSLiam Girdwood 1270414c70cbSLiam Girdwood /* do we need to enable the supply regulator first */ 1271414c70cbSLiam Girdwood if (rdev->supply) { 1272414c70cbSLiam Girdwood ret = _regulator_enable(rdev->supply); 1273414c70cbSLiam Girdwood if (ret < 0) { 1274414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enable %s: %d\n", 12751083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1276414c70cbSLiam Girdwood return ret; 1277414c70cbSLiam Girdwood } 1278414c70cbSLiam Girdwood } 1279414c70cbSLiam Girdwood 1280414c70cbSLiam Girdwood /* check voltage and requested load before enabling */ 1281414c70cbSLiam Girdwood if (rdev->constraints && 12829a2372faSMark Brown (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1283414c70cbSLiam Girdwood drms_uA_update(rdev); 1284414c70cbSLiam Girdwood 12859a2372faSMark Brown if (rdev->use_count == 0) { 12869a2372faSMark Brown /* The regulator may on if it's not switchable or left on */ 12879a2372faSMark Brown ret = _regulator_is_enabled(rdev); 12889a2372faSMark Brown if (ret == -EINVAL || ret == 0) { 12899a2372faSMark Brown if (!_regulator_can_change_status(rdev)) 12909a2372faSMark Brown return -EPERM; 12919a2372faSMark Brown 129231aae2beSMark Brown if (!rdev->desc->ops->enable) 129331aae2beSMark Brown return -EINVAL; 129431aae2beSMark Brown 129531aae2beSMark Brown /* Query before enabling in case configuration 129631aae2beSMark Brown * dependant. */ 129731aae2beSMark Brown ret = _regulator_get_enable_time(rdev); 129831aae2beSMark Brown if (ret >= 0) { 129931aae2beSMark Brown delay = ret; 130031aae2beSMark Brown } else { 130131aae2beSMark Brown printk(KERN_WARNING 130231aae2beSMark Brown "%s: enable_time() failed for %s: %d\n", 130331aae2beSMark Brown __func__, rdev_get_name(rdev), 130431aae2beSMark Brown ret); 130531aae2beSMark Brown delay = 0; 130631aae2beSMark Brown } 130731aae2beSMark Brown 130831aae2beSMark Brown /* Allow the regulator to ramp; it would be useful 130931aae2beSMark Brown * to extend this for bulk operations so that the 131031aae2beSMark Brown * regulators can ramp together. */ 1311414c70cbSLiam Girdwood ret = rdev->desc->ops->enable(rdev); 13129a2372faSMark Brown if (ret < 0) 13139a2372faSMark Brown return ret; 131431aae2beSMark Brown 1315e36c1df8SAxel Lin if (delay >= 1000) { 131631aae2beSMark Brown mdelay(delay / 1000); 1317e36c1df8SAxel Lin udelay(delay % 1000); 1318e36c1df8SAxel Lin } else if (delay) { 131931aae2beSMark Brown udelay(delay); 1320e36c1df8SAxel Lin } 132131aae2beSMark Brown 1322a7433cffSLinus Walleij } else if (ret < 0) { 13239a2372faSMark Brown printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", 13241083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1325414c70cbSLiam Girdwood return ret; 1326414c70cbSLiam Girdwood } 1327a7433cffSLinus Walleij /* Fallthrough on positive return values - already enabled */ 1328414c70cbSLiam Girdwood } 1329414c70cbSLiam Girdwood 13309a2372faSMark Brown rdev->use_count++; 13319a2372faSMark Brown 13329a2372faSMark Brown return 0; 1333414c70cbSLiam Girdwood } 1334414c70cbSLiam Girdwood 1335414c70cbSLiam Girdwood /** 1336414c70cbSLiam Girdwood * regulator_enable - enable regulator output 1337414c70cbSLiam Girdwood * @regulator: regulator source 1338414c70cbSLiam Girdwood * 1339cf7bbcdfSMark Brown * Request that the regulator be enabled with the regulator output at 1340cf7bbcdfSMark Brown * the predefined voltage or current value. Calls to regulator_enable() 1341cf7bbcdfSMark Brown * must be balanced with calls to regulator_disable(). 1342cf7bbcdfSMark Brown * 1343414c70cbSLiam Girdwood * NOTE: the output value can be set by other drivers, boot loader or may be 1344cf7bbcdfSMark Brown * hardwired in the regulator. 1345414c70cbSLiam Girdwood */ 1346414c70cbSLiam Girdwood int regulator_enable(struct regulator *regulator) 1347414c70cbSLiam Girdwood { 1348412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1349412aec61SDavid Brownell int ret = 0; 1350414c70cbSLiam Girdwood 1351412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1352412aec61SDavid Brownell ret = _regulator_enable(rdev); 1353412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 1354414c70cbSLiam Girdwood return ret; 1355414c70cbSLiam Girdwood } 1356414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_enable); 1357414c70cbSLiam Girdwood 1358414c70cbSLiam Girdwood /* locks held by regulator_disable() */ 13598cbf811dSJeffrey Carlyle static int _regulator_disable(struct regulator_dev *rdev, 13608cbf811dSJeffrey Carlyle struct regulator_dev **supply_rdev_ptr) 1361414c70cbSLiam Girdwood { 1362414c70cbSLiam Girdwood int ret = 0; 1363b12a1e29SMattias Wallin *supply_rdev_ptr = NULL; 1364414c70cbSLiam Girdwood 1365cd94b505SDavid Brownell if (WARN(rdev->use_count <= 0, 1366cd94b505SDavid Brownell "unbalanced disables for %s\n", 13671083c393SMark Brown rdev_get_name(rdev))) 1368cd94b505SDavid Brownell return -EIO; 1369cd94b505SDavid Brownell 1370414c70cbSLiam Girdwood /* are we the last user and permitted to disable ? */ 137160ef66fcSMark Brown if (rdev->use_count == 1 && 137260ef66fcSMark Brown (rdev->constraints && !rdev->constraints->always_on)) { 1373414c70cbSLiam Girdwood 1374414c70cbSLiam Girdwood /* we are last user */ 13759a2372faSMark Brown if (_regulator_can_change_status(rdev) && 13769a2372faSMark Brown rdev->desc->ops->disable) { 1377414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1378414c70cbSLiam Girdwood if (ret < 0) { 1379414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to disable %s\n", 13801083c393SMark Brown __func__, rdev_get_name(rdev)); 1381414c70cbSLiam Girdwood return ret; 1382414c70cbSLiam Girdwood } 138384b68263SMark Brown 138484b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 138584b68263SMark Brown NULL); 1386414c70cbSLiam Girdwood } 1387414c70cbSLiam Girdwood 1388414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 13898cbf811dSJeffrey Carlyle *supply_rdev_ptr = rdev->supply; 1390414c70cbSLiam Girdwood 1391414c70cbSLiam Girdwood rdev->use_count = 0; 1392414c70cbSLiam Girdwood } else if (rdev->use_count > 1) { 1393414c70cbSLiam Girdwood 1394414c70cbSLiam Girdwood if (rdev->constraints && 1395414c70cbSLiam Girdwood (rdev->constraints->valid_ops_mask & 1396414c70cbSLiam Girdwood REGULATOR_CHANGE_DRMS)) 1397414c70cbSLiam Girdwood drms_uA_update(rdev); 1398414c70cbSLiam Girdwood 1399414c70cbSLiam Girdwood rdev->use_count--; 1400414c70cbSLiam Girdwood } 1401414c70cbSLiam Girdwood return ret; 1402414c70cbSLiam Girdwood } 1403414c70cbSLiam Girdwood 1404414c70cbSLiam Girdwood /** 1405414c70cbSLiam Girdwood * regulator_disable - disable regulator output 1406414c70cbSLiam Girdwood * @regulator: regulator source 1407414c70cbSLiam Girdwood * 1408cf7bbcdfSMark Brown * Disable the regulator output voltage or current. Calls to 1409cf7bbcdfSMark Brown * regulator_enable() must be balanced with calls to 1410cf7bbcdfSMark Brown * regulator_disable(). 141169279fb9SMark Brown * 1412414c70cbSLiam Girdwood * NOTE: this will only disable the regulator output if no other consumer 1413cf7bbcdfSMark Brown * devices have it enabled, the regulator device supports disabling and 1414cf7bbcdfSMark Brown * machine constraints permit this operation. 1415414c70cbSLiam Girdwood */ 1416414c70cbSLiam Girdwood int regulator_disable(struct regulator *regulator) 1417414c70cbSLiam Girdwood { 1418412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 14198cbf811dSJeffrey Carlyle struct regulator_dev *supply_rdev = NULL; 1420412aec61SDavid Brownell int ret = 0; 1421414c70cbSLiam Girdwood 1422412aec61SDavid Brownell mutex_lock(&rdev->mutex); 14238cbf811dSJeffrey Carlyle ret = _regulator_disable(rdev, &supply_rdev); 1424412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 14258cbf811dSJeffrey Carlyle 14268cbf811dSJeffrey Carlyle /* decrease our supplies ref count and disable if required */ 14278cbf811dSJeffrey Carlyle while (supply_rdev != NULL) { 14288cbf811dSJeffrey Carlyle rdev = supply_rdev; 14298cbf811dSJeffrey Carlyle 14308cbf811dSJeffrey Carlyle mutex_lock(&rdev->mutex); 14318cbf811dSJeffrey Carlyle _regulator_disable(rdev, &supply_rdev); 14328cbf811dSJeffrey Carlyle mutex_unlock(&rdev->mutex); 14338cbf811dSJeffrey Carlyle } 14348cbf811dSJeffrey Carlyle 1435414c70cbSLiam Girdwood return ret; 1436414c70cbSLiam Girdwood } 1437414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_disable); 1438414c70cbSLiam Girdwood 1439414c70cbSLiam Girdwood /* locks held by regulator_force_disable() */ 14408cbf811dSJeffrey Carlyle static int _regulator_force_disable(struct regulator_dev *rdev, 14418cbf811dSJeffrey Carlyle struct regulator_dev **supply_rdev_ptr) 1442414c70cbSLiam Girdwood { 1443414c70cbSLiam Girdwood int ret = 0; 1444414c70cbSLiam Girdwood 1445414c70cbSLiam Girdwood /* force disable */ 1446414c70cbSLiam Girdwood if (rdev->desc->ops->disable) { 1447414c70cbSLiam Girdwood /* ah well, who wants to live forever... */ 1448414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1449414c70cbSLiam Girdwood if (ret < 0) { 1450414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to force disable %s\n", 14511083c393SMark Brown __func__, rdev_get_name(rdev)); 1452414c70cbSLiam Girdwood return ret; 1453414c70cbSLiam Girdwood } 1454414c70cbSLiam Girdwood /* notify other consumers that power has been forced off */ 145584b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 145684b68263SMark Brown REGULATOR_EVENT_DISABLE, NULL); 1457414c70cbSLiam Girdwood } 1458414c70cbSLiam Girdwood 1459414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 14608cbf811dSJeffrey Carlyle *supply_rdev_ptr = rdev->supply; 1461414c70cbSLiam Girdwood 1462414c70cbSLiam Girdwood rdev->use_count = 0; 1463414c70cbSLiam Girdwood return ret; 1464414c70cbSLiam Girdwood } 1465414c70cbSLiam Girdwood 1466414c70cbSLiam Girdwood /** 1467414c70cbSLiam Girdwood * regulator_force_disable - force disable regulator output 1468414c70cbSLiam Girdwood * @regulator: regulator source 1469414c70cbSLiam Girdwood * 1470414c70cbSLiam Girdwood * Forcibly disable the regulator output voltage or current. 1471414c70cbSLiam Girdwood * NOTE: this *will* disable the regulator output even if other consumer 1472414c70cbSLiam Girdwood * devices have it enabled. This should be used for situations when device 1473414c70cbSLiam Girdwood * damage will likely occur if the regulator is not disabled (e.g. over temp). 1474414c70cbSLiam Girdwood */ 1475414c70cbSLiam Girdwood int regulator_force_disable(struct regulator *regulator) 1476414c70cbSLiam Girdwood { 14778cbf811dSJeffrey Carlyle struct regulator_dev *supply_rdev = NULL; 1478414c70cbSLiam Girdwood int ret; 1479414c70cbSLiam Girdwood 1480414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1481414c70cbSLiam Girdwood regulator->uA_load = 0; 14828cbf811dSJeffrey Carlyle ret = _regulator_force_disable(regulator->rdev, &supply_rdev); 1483414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 14848cbf811dSJeffrey Carlyle 14858cbf811dSJeffrey Carlyle if (supply_rdev) 14868cbf811dSJeffrey Carlyle regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); 14878cbf811dSJeffrey Carlyle 1488414c70cbSLiam Girdwood return ret; 1489414c70cbSLiam Girdwood } 1490414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_force_disable); 1491414c70cbSLiam Girdwood 1492414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev) 1493414c70cbSLiam Girdwood { 14949a7f6a4cSMark Brown /* If we don't know then assume that the regulator is always on */ 14959332546fSMark Brown if (!rdev->desc->ops->is_enabled) 14969a7f6a4cSMark Brown return 1; 1497414c70cbSLiam Girdwood 14989332546fSMark Brown return rdev->desc->ops->is_enabled(rdev); 1499414c70cbSLiam Girdwood } 1500414c70cbSLiam Girdwood 1501414c70cbSLiam Girdwood /** 1502414c70cbSLiam Girdwood * regulator_is_enabled - is the regulator output enabled 1503414c70cbSLiam Girdwood * @regulator: regulator source 1504414c70cbSLiam Girdwood * 1505412aec61SDavid Brownell * Returns positive if the regulator driver backing the source/client 1506412aec61SDavid Brownell * has requested that the device be enabled, zero if it hasn't, else a 1507412aec61SDavid Brownell * negative errno code. 1508412aec61SDavid Brownell * 1509412aec61SDavid Brownell * Note that the device backing this regulator handle can have multiple 1510412aec61SDavid Brownell * users, so it might be enabled even if regulator_enable() was never 1511412aec61SDavid Brownell * called for this particular source. 1512414c70cbSLiam Girdwood */ 1513414c70cbSLiam Girdwood int regulator_is_enabled(struct regulator *regulator) 1514414c70cbSLiam Girdwood { 15159332546fSMark Brown int ret; 15169332546fSMark Brown 15179332546fSMark Brown mutex_lock(®ulator->rdev->mutex); 15189332546fSMark Brown ret = _regulator_is_enabled(regulator->rdev); 15199332546fSMark Brown mutex_unlock(®ulator->rdev->mutex); 15209332546fSMark Brown 15219332546fSMark Brown return ret; 1522414c70cbSLiam Girdwood } 1523414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_is_enabled); 1524414c70cbSLiam Girdwood 1525414c70cbSLiam Girdwood /** 15264367cfdcSDavid Brownell * regulator_count_voltages - count regulator_list_voltage() selectors 15274367cfdcSDavid Brownell * @regulator: regulator source 15284367cfdcSDavid Brownell * 15294367cfdcSDavid Brownell * Returns number of selectors, or negative errno. Selectors are 15304367cfdcSDavid Brownell * numbered starting at zero, and typically correspond to bitfields 15314367cfdcSDavid Brownell * in hardware registers. 15324367cfdcSDavid Brownell */ 15334367cfdcSDavid Brownell int regulator_count_voltages(struct regulator *regulator) 15344367cfdcSDavid Brownell { 15354367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15364367cfdcSDavid Brownell 15374367cfdcSDavid Brownell return rdev->desc->n_voltages ? : -EINVAL; 15384367cfdcSDavid Brownell } 15394367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_count_voltages); 15404367cfdcSDavid Brownell 15414367cfdcSDavid Brownell /** 15424367cfdcSDavid Brownell * regulator_list_voltage - enumerate supported voltages 15434367cfdcSDavid Brownell * @regulator: regulator source 15444367cfdcSDavid Brownell * @selector: identify voltage to list 15454367cfdcSDavid Brownell * Context: can sleep 15464367cfdcSDavid Brownell * 15474367cfdcSDavid Brownell * Returns a voltage that can be passed to @regulator_set_voltage(), 154888393161SThomas Weber * zero if this selector code can't be used on this system, or a 15494367cfdcSDavid Brownell * negative errno. 15504367cfdcSDavid Brownell */ 15514367cfdcSDavid Brownell int regulator_list_voltage(struct regulator *regulator, unsigned selector) 15524367cfdcSDavid Brownell { 15534367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15544367cfdcSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 15554367cfdcSDavid Brownell int ret; 15564367cfdcSDavid Brownell 15574367cfdcSDavid Brownell if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 15584367cfdcSDavid Brownell return -EINVAL; 15594367cfdcSDavid Brownell 15604367cfdcSDavid Brownell mutex_lock(&rdev->mutex); 15614367cfdcSDavid Brownell ret = ops->list_voltage(rdev, selector); 15624367cfdcSDavid Brownell mutex_unlock(&rdev->mutex); 15634367cfdcSDavid Brownell 15644367cfdcSDavid Brownell if (ret > 0) { 15654367cfdcSDavid Brownell if (ret < rdev->constraints->min_uV) 15664367cfdcSDavid Brownell ret = 0; 15674367cfdcSDavid Brownell else if (ret > rdev->constraints->max_uV) 15684367cfdcSDavid Brownell ret = 0; 15694367cfdcSDavid Brownell } 15704367cfdcSDavid Brownell 15714367cfdcSDavid Brownell return ret; 15724367cfdcSDavid Brownell } 15734367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_list_voltage); 15744367cfdcSDavid Brownell 15754367cfdcSDavid Brownell /** 1576a7a1ad90SMark Brown * regulator_is_supported_voltage - check if a voltage range can be supported 1577a7a1ad90SMark Brown * 1578a7a1ad90SMark Brown * @regulator: Regulator to check. 1579a7a1ad90SMark Brown * @min_uV: Minimum required voltage in uV. 1580a7a1ad90SMark Brown * @max_uV: Maximum required voltage in uV. 1581a7a1ad90SMark Brown * 1582a7a1ad90SMark Brown * Returns a boolean or a negative error code. 1583a7a1ad90SMark Brown */ 1584a7a1ad90SMark Brown int regulator_is_supported_voltage(struct regulator *regulator, 1585a7a1ad90SMark Brown int min_uV, int max_uV) 1586a7a1ad90SMark Brown { 1587a7a1ad90SMark Brown int i, voltages, ret; 1588a7a1ad90SMark Brown 1589a7a1ad90SMark Brown ret = regulator_count_voltages(regulator); 1590a7a1ad90SMark Brown if (ret < 0) 1591a7a1ad90SMark Brown return ret; 1592a7a1ad90SMark Brown voltages = ret; 1593a7a1ad90SMark Brown 1594a7a1ad90SMark Brown for (i = 0; i < voltages; i++) { 1595a7a1ad90SMark Brown ret = regulator_list_voltage(regulator, i); 1596a7a1ad90SMark Brown 1597a7a1ad90SMark Brown if (ret >= min_uV && ret <= max_uV) 1598a7a1ad90SMark Brown return 1; 1599a7a1ad90SMark Brown } 1600a7a1ad90SMark Brown 1601a7a1ad90SMark Brown return 0; 1602a7a1ad90SMark Brown } 1603a7a1ad90SMark Brown 1604a7a1ad90SMark Brown /** 1605414c70cbSLiam Girdwood * regulator_set_voltage - set regulator output voltage 1606414c70cbSLiam Girdwood * @regulator: regulator source 1607414c70cbSLiam Girdwood * @min_uV: Minimum required voltage in uV 1608414c70cbSLiam Girdwood * @max_uV: Maximum acceptable voltage in uV 1609414c70cbSLiam Girdwood * 1610414c70cbSLiam Girdwood * Sets a voltage regulator to the desired output voltage. This can be set 1611414c70cbSLiam Girdwood * during any regulator state. IOW, regulator can be disabled or enabled. 1612414c70cbSLiam Girdwood * 1613414c70cbSLiam Girdwood * If the regulator is enabled then the voltage will change to the new value 1614414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1615414c70cbSLiam Girdwood * output at the new voltage when enabled. 1616414c70cbSLiam Girdwood * 1617414c70cbSLiam Girdwood * NOTE: If the regulator is shared between several devices then the lowest 1618414c70cbSLiam Girdwood * request voltage that meets the system constraints will be used. 161969279fb9SMark Brown * Regulator system constraints must be set for this regulator before 1620414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1621414c70cbSLiam Girdwood */ 1622414c70cbSLiam Girdwood int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1623414c70cbSLiam Girdwood { 1624414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1625414c70cbSLiam Girdwood int ret; 1626414c70cbSLiam Girdwood 1627414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1628414c70cbSLiam Girdwood 1629414c70cbSLiam Girdwood /* sanity check */ 1630414c70cbSLiam Girdwood if (!rdev->desc->ops->set_voltage) { 1631414c70cbSLiam Girdwood ret = -EINVAL; 1632414c70cbSLiam Girdwood goto out; 1633414c70cbSLiam Girdwood } 1634414c70cbSLiam Girdwood 1635414c70cbSLiam Girdwood /* constraints check */ 1636414c70cbSLiam Girdwood ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1637414c70cbSLiam Girdwood if (ret < 0) 1638414c70cbSLiam Girdwood goto out; 1639414c70cbSLiam Girdwood regulator->min_uV = min_uV; 1640414c70cbSLiam Girdwood regulator->max_uV = max_uV; 1641414c70cbSLiam Girdwood ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1642414c70cbSLiam Girdwood 1643414c70cbSLiam Girdwood out: 1644b136fb44SJonathan Cameron _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1645414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1646414c70cbSLiam Girdwood return ret; 1647414c70cbSLiam Girdwood } 1648414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_voltage); 1649414c70cbSLiam Girdwood 1650414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev) 1651414c70cbSLiam Girdwood { 1652414c70cbSLiam Girdwood /* sanity check */ 1653414c70cbSLiam Girdwood if (rdev->desc->ops->get_voltage) 1654414c70cbSLiam Girdwood return rdev->desc->ops->get_voltage(rdev); 1655414c70cbSLiam Girdwood else 1656414c70cbSLiam Girdwood return -EINVAL; 1657414c70cbSLiam Girdwood } 1658414c70cbSLiam Girdwood 1659414c70cbSLiam Girdwood /** 1660414c70cbSLiam Girdwood * regulator_get_voltage - get regulator output voltage 1661414c70cbSLiam Girdwood * @regulator: regulator source 1662414c70cbSLiam Girdwood * 1663414c70cbSLiam Girdwood * This returns the current regulator voltage in uV. 1664414c70cbSLiam Girdwood * 1665414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the voltage value. This 1666414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1667414c70cbSLiam Girdwood */ 1668414c70cbSLiam Girdwood int regulator_get_voltage(struct regulator *regulator) 1669414c70cbSLiam Girdwood { 1670414c70cbSLiam Girdwood int ret; 1671414c70cbSLiam Girdwood 1672414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1673414c70cbSLiam Girdwood 1674414c70cbSLiam Girdwood ret = _regulator_get_voltage(regulator->rdev); 1675414c70cbSLiam Girdwood 1676414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 1677414c70cbSLiam Girdwood 1678414c70cbSLiam Girdwood return ret; 1679414c70cbSLiam Girdwood } 1680414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_voltage); 1681414c70cbSLiam Girdwood 1682414c70cbSLiam Girdwood /** 1683414c70cbSLiam Girdwood * regulator_set_current_limit - set regulator output current limit 1684414c70cbSLiam Girdwood * @regulator: regulator source 1685414c70cbSLiam Girdwood * @min_uA: Minimuum supported current in uA 1686414c70cbSLiam Girdwood * @max_uA: Maximum supported current in uA 1687414c70cbSLiam Girdwood * 1688414c70cbSLiam Girdwood * Sets current sink to the desired output current. This can be set during 1689414c70cbSLiam Girdwood * any regulator state. IOW, regulator can be disabled or enabled. 1690414c70cbSLiam Girdwood * 1691414c70cbSLiam Girdwood * If the regulator is enabled then the current will change to the new value 1692414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1693414c70cbSLiam Girdwood * output at the new current when enabled. 1694414c70cbSLiam Girdwood * 1695414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1696414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1697414c70cbSLiam Girdwood */ 1698414c70cbSLiam Girdwood int regulator_set_current_limit(struct regulator *regulator, 1699414c70cbSLiam Girdwood int min_uA, int max_uA) 1700414c70cbSLiam Girdwood { 1701414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1702414c70cbSLiam Girdwood int ret; 1703414c70cbSLiam Girdwood 1704414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1705414c70cbSLiam Girdwood 1706414c70cbSLiam Girdwood /* sanity check */ 1707414c70cbSLiam Girdwood if (!rdev->desc->ops->set_current_limit) { 1708414c70cbSLiam Girdwood ret = -EINVAL; 1709414c70cbSLiam Girdwood goto out; 1710414c70cbSLiam Girdwood } 1711414c70cbSLiam Girdwood 1712414c70cbSLiam Girdwood /* constraints check */ 1713414c70cbSLiam Girdwood ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1714414c70cbSLiam Girdwood if (ret < 0) 1715414c70cbSLiam Girdwood goto out; 1716414c70cbSLiam Girdwood 1717414c70cbSLiam Girdwood ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1718414c70cbSLiam Girdwood out: 1719414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1720414c70cbSLiam Girdwood return ret; 1721414c70cbSLiam Girdwood } 1722414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1723414c70cbSLiam Girdwood 1724414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev) 1725414c70cbSLiam Girdwood { 1726414c70cbSLiam Girdwood int ret; 1727414c70cbSLiam Girdwood 1728414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1729414c70cbSLiam Girdwood 1730414c70cbSLiam Girdwood /* sanity check */ 1731414c70cbSLiam Girdwood if (!rdev->desc->ops->get_current_limit) { 1732414c70cbSLiam Girdwood ret = -EINVAL; 1733414c70cbSLiam Girdwood goto out; 1734414c70cbSLiam Girdwood } 1735414c70cbSLiam Girdwood 1736414c70cbSLiam Girdwood ret = rdev->desc->ops->get_current_limit(rdev); 1737414c70cbSLiam Girdwood out: 1738414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1739414c70cbSLiam Girdwood return ret; 1740414c70cbSLiam Girdwood } 1741414c70cbSLiam Girdwood 1742414c70cbSLiam Girdwood /** 1743414c70cbSLiam Girdwood * regulator_get_current_limit - get regulator output current 1744414c70cbSLiam Girdwood * @regulator: regulator source 1745414c70cbSLiam Girdwood * 1746414c70cbSLiam Girdwood * This returns the current supplied by the specified current sink in uA. 1747414c70cbSLiam Girdwood * 1748414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the current value. This 1749414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1750414c70cbSLiam Girdwood */ 1751414c70cbSLiam Girdwood int regulator_get_current_limit(struct regulator *regulator) 1752414c70cbSLiam Girdwood { 1753414c70cbSLiam Girdwood return _regulator_get_current_limit(regulator->rdev); 1754414c70cbSLiam Girdwood } 1755414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1756414c70cbSLiam Girdwood 1757414c70cbSLiam Girdwood /** 1758414c70cbSLiam Girdwood * regulator_set_mode - set regulator operating mode 1759414c70cbSLiam Girdwood * @regulator: regulator source 1760414c70cbSLiam Girdwood * @mode: operating mode - one of the REGULATOR_MODE constants 1761414c70cbSLiam Girdwood * 1762414c70cbSLiam Girdwood * Set regulator operating mode to increase regulator efficiency or improve 1763414c70cbSLiam Girdwood * regulation performance. 1764414c70cbSLiam Girdwood * 1765414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1766414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1767414c70cbSLiam Girdwood */ 1768414c70cbSLiam Girdwood int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1769414c70cbSLiam Girdwood { 1770414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1771414c70cbSLiam Girdwood int ret; 1772500b4ac9SSundar R Iyer int regulator_curr_mode; 1773414c70cbSLiam Girdwood 1774414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1775414c70cbSLiam Girdwood 1776414c70cbSLiam Girdwood /* sanity check */ 1777414c70cbSLiam Girdwood if (!rdev->desc->ops->set_mode) { 1778414c70cbSLiam Girdwood ret = -EINVAL; 1779414c70cbSLiam Girdwood goto out; 1780414c70cbSLiam Girdwood } 1781414c70cbSLiam Girdwood 1782500b4ac9SSundar R Iyer /* return if the same mode is requested */ 1783500b4ac9SSundar R Iyer if (rdev->desc->ops->get_mode) { 1784500b4ac9SSundar R Iyer regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1785500b4ac9SSundar R Iyer if (regulator_curr_mode == mode) { 1786500b4ac9SSundar R Iyer ret = 0; 1787500b4ac9SSundar R Iyer goto out; 1788500b4ac9SSundar R Iyer } 1789500b4ac9SSundar R Iyer } 1790500b4ac9SSundar R Iyer 1791414c70cbSLiam Girdwood /* constraints check */ 1792414c70cbSLiam Girdwood ret = regulator_check_mode(rdev, mode); 1793414c70cbSLiam Girdwood if (ret < 0) 1794414c70cbSLiam Girdwood goto out; 1795414c70cbSLiam Girdwood 1796414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1797414c70cbSLiam Girdwood out: 1798414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1799414c70cbSLiam Girdwood return ret; 1800414c70cbSLiam Girdwood } 1801414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_mode); 1802414c70cbSLiam Girdwood 1803414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1804414c70cbSLiam Girdwood { 1805414c70cbSLiam Girdwood int ret; 1806414c70cbSLiam Girdwood 1807414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1808414c70cbSLiam Girdwood 1809414c70cbSLiam Girdwood /* sanity check */ 1810414c70cbSLiam Girdwood if (!rdev->desc->ops->get_mode) { 1811414c70cbSLiam Girdwood ret = -EINVAL; 1812414c70cbSLiam Girdwood goto out; 1813414c70cbSLiam Girdwood } 1814414c70cbSLiam Girdwood 1815414c70cbSLiam Girdwood ret = rdev->desc->ops->get_mode(rdev); 1816414c70cbSLiam Girdwood out: 1817414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1818414c70cbSLiam Girdwood return ret; 1819414c70cbSLiam Girdwood } 1820414c70cbSLiam Girdwood 1821414c70cbSLiam Girdwood /** 1822414c70cbSLiam Girdwood * regulator_get_mode - get regulator operating mode 1823414c70cbSLiam Girdwood * @regulator: regulator source 1824414c70cbSLiam Girdwood * 1825414c70cbSLiam Girdwood * Get the current regulator operating mode. 1826414c70cbSLiam Girdwood */ 1827414c70cbSLiam Girdwood unsigned int regulator_get_mode(struct regulator *regulator) 1828414c70cbSLiam Girdwood { 1829414c70cbSLiam Girdwood return _regulator_get_mode(regulator->rdev); 1830414c70cbSLiam Girdwood } 1831414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_mode); 1832414c70cbSLiam Girdwood 1833414c70cbSLiam Girdwood /** 1834414c70cbSLiam Girdwood * regulator_set_optimum_mode - set regulator optimum operating mode 1835414c70cbSLiam Girdwood * @regulator: regulator source 1836414c70cbSLiam Girdwood * @uA_load: load current 1837414c70cbSLiam Girdwood * 1838414c70cbSLiam Girdwood * Notifies the regulator core of a new device load. This is then used by 1839414c70cbSLiam Girdwood * DRMS (if enabled by constraints) to set the most efficient regulator 1840414c70cbSLiam Girdwood * operating mode for the new regulator loading. 1841414c70cbSLiam Girdwood * 1842414c70cbSLiam Girdwood * Consumer devices notify their supply regulator of the maximum power 1843414c70cbSLiam Girdwood * they will require (can be taken from device datasheet in the power 1844414c70cbSLiam Girdwood * consumption tables) when they change operational status and hence power 1845414c70cbSLiam Girdwood * state. Examples of operational state changes that can affect power 1846414c70cbSLiam Girdwood * consumption are :- 1847414c70cbSLiam Girdwood * 1848414c70cbSLiam Girdwood * o Device is opened / closed. 1849414c70cbSLiam Girdwood * o Device I/O is about to begin or has just finished. 1850414c70cbSLiam Girdwood * o Device is idling in between work. 1851414c70cbSLiam Girdwood * 1852414c70cbSLiam Girdwood * This information is also exported via sysfs to userspace. 1853414c70cbSLiam Girdwood * 1854414c70cbSLiam Girdwood * DRMS will sum the total requested load on the regulator and change 1855414c70cbSLiam Girdwood * to the most efficient operating mode if platform constraints allow. 1856414c70cbSLiam Girdwood * 1857414c70cbSLiam Girdwood * Returns the new regulator mode or error. 1858414c70cbSLiam Girdwood */ 1859414c70cbSLiam Girdwood int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1860414c70cbSLiam Girdwood { 1861414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1862414c70cbSLiam Girdwood struct regulator *consumer; 1863414c70cbSLiam Girdwood int ret, output_uV, input_uV, total_uA_load = 0; 1864414c70cbSLiam Girdwood unsigned int mode; 1865414c70cbSLiam Girdwood 1866414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1867414c70cbSLiam Girdwood 1868414c70cbSLiam Girdwood regulator->uA_load = uA_load; 1869414c70cbSLiam Girdwood ret = regulator_check_drms(rdev); 1870414c70cbSLiam Girdwood if (ret < 0) 1871414c70cbSLiam Girdwood goto out; 1872414c70cbSLiam Girdwood ret = -EINVAL; 1873414c70cbSLiam Girdwood 1874414c70cbSLiam Girdwood /* sanity check */ 1875414c70cbSLiam Girdwood if (!rdev->desc->ops->get_optimum_mode) 1876414c70cbSLiam Girdwood goto out; 1877414c70cbSLiam Girdwood 1878414c70cbSLiam Girdwood /* get output voltage */ 1879414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 1880414c70cbSLiam Girdwood if (output_uV <= 0) { 1881414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid output voltage found for %s\n", 18821083c393SMark Brown __func__, rdev_get_name(rdev)); 1883414c70cbSLiam Girdwood goto out; 1884414c70cbSLiam Girdwood } 1885414c70cbSLiam Girdwood 1886414c70cbSLiam Girdwood /* get input voltage */ 1887414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1888414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1889414c70cbSLiam Girdwood else 1890414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 1891414c70cbSLiam Girdwood if (input_uV <= 0) { 1892414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid input voltage found for %s\n", 18931083c393SMark Brown __func__, rdev_get_name(rdev)); 1894414c70cbSLiam Girdwood goto out; 1895414c70cbSLiam Girdwood } 1896414c70cbSLiam Girdwood 1897414c70cbSLiam Girdwood /* calc total requested load for this regulator */ 1898414c70cbSLiam Girdwood list_for_each_entry(consumer, &rdev->consumer_list, list) 1899414c70cbSLiam Girdwood total_uA_load += consumer->uA_load; 1900414c70cbSLiam Girdwood 1901414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, 1902414c70cbSLiam Girdwood input_uV, output_uV, 1903414c70cbSLiam Girdwood total_uA_load); 1904e573520bSDavid Brownell ret = regulator_check_mode(rdev, mode); 1905e573520bSDavid Brownell if (ret < 0) { 1906414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to get optimum mode for %s @" 19071083c393SMark Brown " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), 1908414c70cbSLiam Girdwood total_uA_load, input_uV, output_uV); 1909414c70cbSLiam Girdwood goto out; 1910414c70cbSLiam Girdwood } 1911414c70cbSLiam Girdwood 1912414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1913e573520bSDavid Brownell if (ret < 0) { 1914414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 19151083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 1916414c70cbSLiam Girdwood goto out; 1917414c70cbSLiam Girdwood } 1918414c70cbSLiam Girdwood ret = mode; 1919414c70cbSLiam Girdwood out: 1920414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1921414c70cbSLiam Girdwood return ret; 1922414c70cbSLiam Girdwood } 1923414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1924414c70cbSLiam Girdwood 1925414c70cbSLiam Girdwood /** 1926414c70cbSLiam Girdwood * regulator_register_notifier - register regulator event notifier 1927414c70cbSLiam Girdwood * @regulator: regulator source 192869279fb9SMark Brown * @nb: notifier block 1929414c70cbSLiam Girdwood * 1930414c70cbSLiam Girdwood * Register notifier block to receive regulator events. 1931414c70cbSLiam Girdwood */ 1932414c70cbSLiam Girdwood int regulator_register_notifier(struct regulator *regulator, 1933414c70cbSLiam Girdwood struct notifier_block *nb) 1934414c70cbSLiam Girdwood { 1935414c70cbSLiam Girdwood return blocking_notifier_chain_register(®ulator->rdev->notifier, 1936414c70cbSLiam Girdwood nb); 1937414c70cbSLiam Girdwood } 1938414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register_notifier); 1939414c70cbSLiam Girdwood 1940414c70cbSLiam Girdwood /** 1941414c70cbSLiam Girdwood * regulator_unregister_notifier - unregister regulator event notifier 1942414c70cbSLiam Girdwood * @regulator: regulator source 194369279fb9SMark Brown * @nb: notifier block 1944414c70cbSLiam Girdwood * 1945414c70cbSLiam Girdwood * Unregister regulator event notifier block. 1946414c70cbSLiam Girdwood */ 1947414c70cbSLiam Girdwood int regulator_unregister_notifier(struct regulator *regulator, 1948414c70cbSLiam Girdwood struct notifier_block *nb) 1949414c70cbSLiam Girdwood { 1950414c70cbSLiam Girdwood return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1951414c70cbSLiam Girdwood nb); 1952414c70cbSLiam Girdwood } 1953414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1954414c70cbSLiam Girdwood 1955b136fb44SJonathan Cameron /* notify regulator consumers and downstream regulator consumers. 1956b136fb44SJonathan Cameron * Note mutex must be held by caller. 1957b136fb44SJonathan Cameron */ 1958414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 1959414c70cbSLiam Girdwood unsigned long event, void *data) 1960414c70cbSLiam Girdwood { 1961414c70cbSLiam Girdwood struct regulator_dev *_rdev; 1962414c70cbSLiam Girdwood 1963414c70cbSLiam Girdwood /* call rdev chain first */ 1964414c70cbSLiam Girdwood blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1965414c70cbSLiam Girdwood 1966414c70cbSLiam Girdwood /* now notify regulator we supply */ 1967b136fb44SJonathan Cameron list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1968b136fb44SJonathan Cameron mutex_lock(&_rdev->mutex); 1969414c70cbSLiam Girdwood _notifier_call_chain(_rdev, event, data); 1970b136fb44SJonathan Cameron mutex_unlock(&_rdev->mutex); 1971b136fb44SJonathan Cameron } 1972414c70cbSLiam Girdwood } 1973414c70cbSLiam Girdwood 1974414c70cbSLiam Girdwood /** 1975414c70cbSLiam Girdwood * regulator_bulk_get - get multiple regulator consumers 1976414c70cbSLiam Girdwood * 1977414c70cbSLiam Girdwood * @dev: Device to supply 1978414c70cbSLiam Girdwood * @num_consumers: Number of consumers to register 1979414c70cbSLiam Girdwood * @consumers: Configuration of consumers; clients are stored here. 1980414c70cbSLiam Girdwood * 1981414c70cbSLiam Girdwood * @return 0 on success, an errno on failure. 1982414c70cbSLiam Girdwood * 1983414c70cbSLiam Girdwood * This helper function allows drivers to get several regulator 1984414c70cbSLiam Girdwood * consumers in one operation. If any of the regulators cannot be 1985414c70cbSLiam Girdwood * acquired then any regulators that were allocated will be freed 1986414c70cbSLiam Girdwood * before returning to the caller. 1987414c70cbSLiam Girdwood */ 1988414c70cbSLiam Girdwood int regulator_bulk_get(struct device *dev, int num_consumers, 1989414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 1990414c70cbSLiam Girdwood { 1991414c70cbSLiam Girdwood int i; 1992414c70cbSLiam Girdwood int ret; 1993414c70cbSLiam Girdwood 1994414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) 1995414c70cbSLiam Girdwood consumers[i].consumer = NULL; 1996414c70cbSLiam Girdwood 1997414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 1998414c70cbSLiam Girdwood consumers[i].consumer = regulator_get(dev, 1999414c70cbSLiam Girdwood consumers[i].supply); 2000414c70cbSLiam Girdwood if (IS_ERR(consumers[i].consumer)) { 2001414c70cbSLiam Girdwood ret = PTR_ERR(consumers[i].consumer); 20025b307627SMark Brown dev_err(dev, "Failed to get supply '%s': %d\n", 20035b307627SMark Brown consumers[i].supply, ret); 2004414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2005414c70cbSLiam Girdwood goto err; 2006414c70cbSLiam Girdwood } 2007414c70cbSLiam Girdwood } 2008414c70cbSLiam Girdwood 2009414c70cbSLiam Girdwood return 0; 2010414c70cbSLiam Girdwood 2011414c70cbSLiam Girdwood err: 2012414c70cbSLiam Girdwood for (i = 0; i < num_consumers && consumers[i].consumer; i++) 2013414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2014414c70cbSLiam Girdwood 2015414c70cbSLiam Girdwood return ret; 2016414c70cbSLiam Girdwood } 2017414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_get); 2018414c70cbSLiam Girdwood 2019414c70cbSLiam Girdwood /** 2020414c70cbSLiam Girdwood * regulator_bulk_enable - enable multiple regulator consumers 2021414c70cbSLiam Girdwood * 2022414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2023414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2024414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2025414c70cbSLiam Girdwood * 2026414c70cbSLiam Girdwood * This convenience API allows consumers to enable multiple regulator 2027414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2028414c70cbSLiam Girdwood * then any others that were enabled will be disabled again prior to 2029414c70cbSLiam Girdwood * return. 2030414c70cbSLiam Girdwood */ 2031414c70cbSLiam Girdwood int regulator_bulk_enable(int num_consumers, 2032414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2033414c70cbSLiam Girdwood { 2034414c70cbSLiam Girdwood int i; 2035414c70cbSLiam Girdwood int ret; 2036414c70cbSLiam Girdwood 2037414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2038414c70cbSLiam Girdwood ret = regulator_enable(consumers[i].consumer); 2039414c70cbSLiam Girdwood if (ret != 0) 2040414c70cbSLiam Girdwood goto err; 2041414c70cbSLiam Girdwood } 2042414c70cbSLiam Girdwood 2043414c70cbSLiam Girdwood return 0; 2044414c70cbSLiam Girdwood 2045414c70cbSLiam Girdwood err: 20465b307627SMark Brown printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); 2047eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2048414c70cbSLiam Girdwood regulator_disable(consumers[i].consumer); 2049414c70cbSLiam Girdwood 2050414c70cbSLiam Girdwood return ret; 2051414c70cbSLiam Girdwood } 2052414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2053414c70cbSLiam Girdwood 2054414c70cbSLiam Girdwood /** 2055414c70cbSLiam Girdwood * regulator_bulk_disable - disable multiple regulator consumers 2056414c70cbSLiam Girdwood * 2057414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2058414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2059414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2060414c70cbSLiam Girdwood * 2061414c70cbSLiam Girdwood * This convenience API allows consumers to disable multiple regulator 2062414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2063414c70cbSLiam Girdwood * then any others that were disabled will be disabled again prior to 2064414c70cbSLiam Girdwood * return. 2065414c70cbSLiam Girdwood */ 2066414c70cbSLiam Girdwood int regulator_bulk_disable(int num_consumers, 2067414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2068414c70cbSLiam Girdwood { 2069414c70cbSLiam Girdwood int i; 2070414c70cbSLiam Girdwood int ret; 2071414c70cbSLiam Girdwood 2072414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2073414c70cbSLiam Girdwood ret = regulator_disable(consumers[i].consumer); 2074414c70cbSLiam Girdwood if (ret != 0) 2075414c70cbSLiam Girdwood goto err; 2076414c70cbSLiam Girdwood } 2077414c70cbSLiam Girdwood 2078414c70cbSLiam Girdwood return 0; 2079414c70cbSLiam Girdwood 2080414c70cbSLiam Girdwood err: 20815b307627SMark Brown printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, 20825b307627SMark Brown ret); 2083eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2084414c70cbSLiam Girdwood regulator_enable(consumers[i].consumer); 2085414c70cbSLiam Girdwood 2086414c70cbSLiam Girdwood return ret; 2087414c70cbSLiam Girdwood } 2088414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2089414c70cbSLiam Girdwood 2090414c70cbSLiam Girdwood /** 2091414c70cbSLiam Girdwood * regulator_bulk_free - free multiple regulator consumers 2092414c70cbSLiam Girdwood * 2093414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2094414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2095414c70cbSLiam Girdwood * 2096414c70cbSLiam Girdwood * This convenience API allows consumers to free multiple regulator 2097414c70cbSLiam Girdwood * clients in a single API call. 2098414c70cbSLiam Girdwood */ 2099414c70cbSLiam Girdwood void regulator_bulk_free(int num_consumers, 2100414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2101414c70cbSLiam Girdwood { 2102414c70cbSLiam Girdwood int i; 2103414c70cbSLiam Girdwood 2104414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2105414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2106414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2107414c70cbSLiam Girdwood } 2108414c70cbSLiam Girdwood } 2109414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_free); 2110414c70cbSLiam Girdwood 2111414c70cbSLiam Girdwood /** 2112414c70cbSLiam Girdwood * regulator_notifier_call_chain - call regulator event notifier 211369279fb9SMark Brown * @rdev: regulator source 2114414c70cbSLiam Girdwood * @event: notifier block 211569279fb9SMark Brown * @data: callback-specific data. 2116414c70cbSLiam Girdwood * 2117414c70cbSLiam Girdwood * Called by regulator drivers to notify clients a regulator event has 2118414c70cbSLiam Girdwood * occurred. We also notify regulator clients downstream. 2119b136fb44SJonathan Cameron * Note lock must be held by caller. 2120414c70cbSLiam Girdwood */ 2121414c70cbSLiam Girdwood int regulator_notifier_call_chain(struct regulator_dev *rdev, 2122414c70cbSLiam Girdwood unsigned long event, void *data) 2123414c70cbSLiam Girdwood { 2124414c70cbSLiam Girdwood _notifier_call_chain(rdev, event, data); 2125414c70cbSLiam Girdwood return NOTIFY_DONE; 2126414c70cbSLiam Girdwood 2127414c70cbSLiam Girdwood } 2128414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2129414c70cbSLiam Girdwood 2130be721979SMark Brown /** 2131be721979SMark Brown * regulator_mode_to_status - convert a regulator mode into a status 2132be721979SMark Brown * 2133be721979SMark Brown * @mode: Mode to convert 2134be721979SMark Brown * 2135be721979SMark Brown * Convert a regulator mode into a status. 2136be721979SMark Brown */ 2137be721979SMark Brown int regulator_mode_to_status(unsigned int mode) 2138be721979SMark Brown { 2139be721979SMark Brown switch (mode) { 2140be721979SMark Brown case REGULATOR_MODE_FAST: 2141be721979SMark Brown return REGULATOR_STATUS_FAST; 2142be721979SMark Brown case REGULATOR_MODE_NORMAL: 2143be721979SMark Brown return REGULATOR_STATUS_NORMAL; 2144be721979SMark Brown case REGULATOR_MODE_IDLE: 2145be721979SMark Brown return REGULATOR_STATUS_IDLE; 2146be721979SMark Brown case REGULATOR_STATUS_STANDBY: 2147be721979SMark Brown return REGULATOR_STATUS_STANDBY; 2148be721979SMark Brown default: 2149be721979SMark Brown return 0; 2150be721979SMark Brown } 2151be721979SMark Brown } 2152be721979SMark Brown EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2153be721979SMark Brown 21547ad68e2fSDavid Brownell /* 21557ad68e2fSDavid Brownell * To avoid cluttering sysfs (and memory) with useless state, only 21567ad68e2fSDavid Brownell * create attributes that can be meaningfully displayed. 21577ad68e2fSDavid Brownell */ 21587ad68e2fSDavid Brownell static int add_regulator_attributes(struct regulator_dev *rdev) 21597ad68e2fSDavid Brownell { 21607ad68e2fSDavid Brownell struct device *dev = &rdev->dev; 21617ad68e2fSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 21627ad68e2fSDavid Brownell int status = 0; 21637ad68e2fSDavid Brownell 21647ad68e2fSDavid Brownell /* some attributes need specific methods to be displayed */ 21657ad68e2fSDavid Brownell if (ops->get_voltage) { 21667ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microvolts); 21677ad68e2fSDavid Brownell if (status < 0) 21687ad68e2fSDavid Brownell return status; 21697ad68e2fSDavid Brownell } 21707ad68e2fSDavid Brownell if (ops->get_current_limit) { 21717ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microamps); 21727ad68e2fSDavid Brownell if (status < 0) 21737ad68e2fSDavid Brownell return status; 21747ad68e2fSDavid Brownell } 21757ad68e2fSDavid Brownell if (ops->get_mode) { 21767ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_opmode); 21777ad68e2fSDavid Brownell if (status < 0) 21787ad68e2fSDavid Brownell return status; 21797ad68e2fSDavid Brownell } 21807ad68e2fSDavid Brownell if (ops->is_enabled) { 21817ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_state); 21827ad68e2fSDavid Brownell if (status < 0) 21837ad68e2fSDavid Brownell return status; 21847ad68e2fSDavid Brownell } 2185853116a1SDavid Brownell if (ops->get_status) { 2186853116a1SDavid Brownell status = device_create_file(dev, &dev_attr_status); 2187853116a1SDavid Brownell if (status < 0) 2188853116a1SDavid Brownell return status; 2189853116a1SDavid Brownell } 21907ad68e2fSDavid Brownell 21917ad68e2fSDavid Brownell /* some attributes are type-specific */ 21927ad68e2fSDavid Brownell if (rdev->desc->type == REGULATOR_CURRENT) { 21937ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_requested_microamps); 21947ad68e2fSDavid Brownell if (status < 0) 21957ad68e2fSDavid Brownell return status; 21967ad68e2fSDavid Brownell } 21977ad68e2fSDavid Brownell 21987ad68e2fSDavid Brownell /* all the other attributes exist to support constraints; 21997ad68e2fSDavid Brownell * don't show them if there are no constraints, or if the 22007ad68e2fSDavid Brownell * relevant supporting methods are missing. 22017ad68e2fSDavid Brownell */ 22027ad68e2fSDavid Brownell if (!rdev->constraints) 22037ad68e2fSDavid Brownell return status; 22047ad68e2fSDavid Brownell 22057ad68e2fSDavid Brownell /* constraints need specific supporting methods */ 22067ad68e2fSDavid Brownell if (ops->set_voltage) { 22077ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microvolts); 22087ad68e2fSDavid Brownell if (status < 0) 22097ad68e2fSDavid Brownell return status; 22107ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microvolts); 22117ad68e2fSDavid Brownell if (status < 0) 22127ad68e2fSDavid Brownell return status; 22137ad68e2fSDavid Brownell } 22147ad68e2fSDavid Brownell if (ops->set_current_limit) { 22157ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microamps); 22167ad68e2fSDavid Brownell if (status < 0) 22177ad68e2fSDavid Brownell return status; 22187ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microamps); 22197ad68e2fSDavid Brownell if (status < 0) 22207ad68e2fSDavid Brownell return status; 22217ad68e2fSDavid Brownell } 22227ad68e2fSDavid Brownell 22237ad68e2fSDavid Brownell /* suspend mode constraints need multiple supporting methods */ 22247ad68e2fSDavid Brownell if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 22257ad68e2fSDavid Brownell return status; 22267ad68e2fSDavid Brownell 22277ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_standby_state); 22287ad68e2fSDavid Brownell if (status < 0) 22297ad68e2fSDavid Brownell return status; 22307ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_mem_state); 22317ad68e2fSDavid Brownell if (status < 0) 22327ad68e2fSDavid Brownell return status; 22337ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_disk_state); 22347ad68e2fSDavid Brownell if (status < 0) 22357ad68e2fSDavid Brownell return status; 22367ad68e2fSDavid Brownell 22377ad68e2fSDavid Brownell if (ops->set_suspend_voltage) { 22387ad68e2fSDavid Brownell status = device_create_file(dev, 22397ad68e2fSDavid Brownell &dev_attr_suspend_standby_microvolts); 22407ad68e2fSDavid Brownell if (status < 0) 22417ad68e2fSDavid Brownell return status; 22427ad68e2fSDavid Brownell status = device_create_file(dev, 22437ad68e2fSDavid Brownell &dev_attr_suspend_mem_microvolts); 22447ad68e2fSDavid Brownell if (status < 0) 22457ad68e2fSDavid Brownell return status; 22467ad68e2fSDavid Brownell status = device_create_file(dev, 22477ad68e2fSDavid Brownell &dev_attr_suspend_disk_microvolts); 22487ad68e2fSDavid Brownell if (status < 0) 22497ad68e2fSDavid Brownell return status; 22507ad68e2fSDavid Brownell } 22517ad68e2fSDavid Brownell 22527ad68e2fSDavid Brownell if (ops->set_suspend_mode) { 22537ad68e2fSDavid Brownell status = device_create_file(dev, 22547ad68e2fSDavid Brownell &dev_attr_suspend_standby_mode); 22557ad68e2fSDavid Brownell if (status < 0) 22567ad68e2fSDavid Brownell return status; 22577ad68e2fSDavid Brownell status = device_create_file(dev, 22587ad68e2fSDavid Brownell &dev_attr_suspend_mem_mode); 22597ad68e2fSDavid Brownell if (status < 0) 22607ad68e2fSDavid Brownell return status; 22617ad68e2fSDavid Brownell status = device_create_file(dev, 22627ad68e2fSDavid Brownell &dev_attr_suspend_disk_mode); 22637ad68e2fSDavid Brownell if (status < 0) 22647ad68e2fSDavid Brownell return status; 22657ad68e2fSDavid Brownell } 22667ad68e2fSDavid Brownell 22677ad68e2fSDavid Brownell return status; 22687ad68e2fSDavid Brownell } 22697ad68e2fSDavid Brownell 2270414c70cbSLiam Girdwood /** 2271414c70cbSLiam Girdwood * regulator_register - register regulator 227269279fb9SMark Brown * @regulator_desc: regulator to register 227369279fb9SMark Brown * @dev: struct device for the regulator 22740527100fSMark Brown * @init_data: platform provided init data, passed through by driver 227569279fb9SMark Brown * @driver_data: private regulator data 2276414c70cbSLiam Girdwood * 2277414c70cbSLiam Girdwood * Called by regulator drivers to register a regulator. 2278414c70cbSLiam Girdwood * Returns 0 on success. 2279414c70cbSLiam Girdwood */ 2280414c70cbSLiam Girdwood struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 22810527100fSMark Brown struct device *dev, struct regulator_init_data *init_data, 22820527100fSMark Brown void *driver_data) 2283414c70cbSLiam Girdwood { 2284414c70cbSLiam Girdwood static atomic_t regulator_no = ATOMIC_INIT(0); 2285414c70cbSLiam Girdwood struct regulator_dev *rdev; 2286a5766f11SLiam Girdwood int ret, i; 2287414c70cbSLiam Girdwood 2288414c70cbSLiam Girdwood if (regulator_desc == NULL) 2289414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2290414c70cbSLiam Girdwood 2291414c70cbSLiam Girdwood if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2292414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2293414c70cbSLiam Girdwood 2294cd78dfc6SDiego Liziero if (regulator_desc->type != REGULATOR_VOLTAGE && 2295cd78dfc6SDiego Liziero regulator_desc->type != REGULATOR_CURRENT) 2296414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2297414c70cbSLiam Girdwood 229846fabe1eSMark Brown if (!init_data) 229946fabe1eSMark Brown return ERR_PTR(-EINVAL); 230046fabe1eSMark Brown 2301414c70cbSLiam Girdwood rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2302414c70cbSLiam Girdwood if (rdev == NULL) 2303414c70cbSLiam Girdwood return ERR_PTR(-ENOMEM); 2304414c70cbSLiam Girdwood 2305414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2306414c70cbSLiam Girdwood 2307414c70cbSLiam Girdwood mutex_init(&rdev->mutex); 2308a5766f11SLiam Girdwood rdev->reg_data = driver_data; 2309414c70cbSLiam Girdwood rdev->owner = regulator_desc->owner; 2310414c70cbSLiam Girdwood rdev->desc = regulator_desc; 2311414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->consumer_list); 2312414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->supply_list); 2313414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->list); 2314414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->slist); 2315414c70cbSLiam Girdwood BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2316414c70cbSLiam Girdwood 2317a5766f11SLiam Girdwood /* preform any regulator specific init */ 2318a5766f11SLiam Girdwood if (init_data->regulator_init) { 2319a5766f11SLiam Girdwood ret = init_data->regulator_init(rdev->reg_data); 23204fca9545SDavid Brownell if (ret < 0) 23214fca9545SDavid Brownell goto clean; 2322a5766f11SLiam Girdwood } 2323a5766f11SLiam Girdwood 2324a5766f11SLiam Girdwood /* register with sysfs */ 2325a5766f11SLiam Girdwood rdev->dev.class = ®ulator_class; 2326a5766f11SLiam Girdwood rdev->dev.parent = dev; 2327812460a9SKay Sievers dev_set_name(&rdev->dev, "regulator.%d", 2328812460a9SKay Sievers atomic_inc_return(®ulator_no) - 1); 2329a5766f11SLiam Girdwood ret = device_register(&rdev->dev); 2330ad7725cbSVasiliy Kulikov if (ret != 0) { 2331ad7725cbSVasiliy Kulikov put_device(&rdev->dev); 23324fca9545SDavid Brownell goto clean; 2333ad7725cbSVasiliy Kulikov } 2334a5766f11SLiam Girdwood 2335a5766f11SLiam Girdwood dev_set_drvdata(&rdev->dev, rdev); 2336a5766f11SLiam Girdwood 233774f544c1SMike Rapoport /* set regulator constraints */ 233874f544c1SMike Rapoport ret = set_machine_constraints(rdev, &init_data->constraints); 233974f544c1SMike Rapoport if (ret < 0) 234074f544c1SMike Rapoport goto scrub; 234174f544c1SMike Rapoport 23427ad68e2fSDavid Brownell /* add attributes supported by this regulator */ 23437ad68e2fSDavid Brownell ret = add_regulator_attributes(rdev); 23447ad68e2fSDavid Brownell if (ret < 0) 23457ad68e2fSDavid Brownell goto scrub; 23467ad68e2fSDavid Brownell 2347a5766f11SLiam Girdwood /* set supply regulator if it exists */ 23480178f3e2SMark Brown if (init_data->supply_regulator && init_data->supply_regulator_dev) { 23490178f3e2SMark Brown dev_err(dev, 23500178f3e2SMark Brown "Supply regulator specified by both name and dev\n"); 23510178f3e2SMark Brown goto scrub; 23520178f3e2SMark Brown } 23530178f3e2SMark Brown 23540178f3e2SMark Brown if (init_data->supply_regulator) { 23550178f3e2SMark Brown struct regulator_dev *r; 23560178f3e2SMark Brown int found = 0; 23570178f3e2SMark Brown 23580178f3e2SMark Brown list_for_each_entry(r, ®ulator_list, list) { 23590178f3e2SMark Brown if (strcmp(rdev_get_name(r), 23600178f3e2SMark Brown init_data->supply_regulator) == 0) { 23610178f3e2SMark Brown found = 1; 23620178f3e2SMark Brown break; 23630178f3e2SMark Brown } 23640178f3e2SMark Brown } 23650178f3e2SMark Brown 23660178f3e2SMark Brown if (!found) { 23670178f3e2SMark Brown dev_err(dev, "Failed to find supply %s\n", 23680178f3e2SMark Brown init_data->supply_regulator); 23690178f3e2SMark Brown goto scrub; 23700178f3e2SMark Brown } 23710178f3e2SMark Brown 23720178f3e2SMark Brown ret = set_supply(rdev, r); 23730178f3e2SMark Brown if (ret < 0) 23740178f3e2SMark Brown goto scrub; 23750178f3e2SMark Brown } 23760178f3e2SMark Brown 2377a5766f11SLiam Girdwood if (init_data->supply_regulator_dev) { 23780178f3e2SMark Brown dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2379a5766f11SLiam Girdwood ret = set_supply(rdev, 2380a5766f11SLiam Girdwood dev_get_drvdata(init_data->supply_regulator_dev)); 23814fca9545SDavid Brownell if (ret < 0) 23824fca9545SDavid Brownell goto scrub; 2383a5766f11SLiam Girdwood } 2384a5766f11SLiam Girdwood 2385a5766f11SLiam Girdwood /* add consumers devices */ 2386a5766f11SLiam Girdwood for (i = 0; i < init_data->num_consumer_supplies; i++) { 2387a5766f11SLiam Girdwood ret = set_consumer_device_supply(rdev, 2388a5766f11SLiam Girdwood init_data->consumer_supplies[i].dev, 238940f9244fSMark Brown init_data->consumer_supplies[i].dev_name, 2390a5766f11SLiam Girdwood init_data->consumer_supplies[i].supply); 2391d4033b54SJani Nikula if (ret < 0) 2392d4033b54SJani Nikula goto unset_supplies; 2393a5766f11SLiam Girdwood } 2394a5766f11SLiam Girdwood 2395a5766f11SLiam Girdwood list_add(&rdev->list, ®ulator_list); 2396a5766f11SLiam Girdwood out: 2397414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2398414c70cbSLiam Girdwood return rdev; 23994fca9545SDavid Brownell 2400d4033b54SJani Nikula unset_supplies: 2401d4033b54SJani Nikula unset_regulator_supplies(rdev); 2402d4033b54SJani Nikula 24034fca9545SDavid Brownell scrub: 24044fca9545SDavid Brownell device_unregister(&rdev->dev); 240553032dafSPaul Walmsley /* device core frees rdev */ 240653032dafSPaul Walmsley rdev = ERR_PTR(ret); 240753032dafSPaul Walmsley goto out; 240853032dafSPaul Walmsley 24094fca9545SDavid Brownell clean: 24104fca9545SDavid Brownell kfree(rdev); 24114fca9545SDavid Brownell rdev = ERR_PTR(ret); 24124fca9545SDavid Brownell goto out; 2413414c70cbSLiam Girdwood } 2414414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register); 2415414c70cbSLiam Girdwood 2416414c70cbSLiam Girdwood /** 2417414c70cbSLiam Girdwood * regulator_unregister - unregister regulator 241869279fb9SMark Brown * @rdev: regulator to unregister 2419414c70cbSLiam Girdwood * 2420414c70cbSLiam Girdwood * Called by regulator drivers to unregister a regulator. 2421414c70cbSLiam Girdwood */ 2422414c70cbSLiam Girdwood void regulator_unregister(struct regulator_dev *rdev) 2423414c70cbSLiam Girdwood { 2424414c70cbSLiam Girdwood if (rdev == NULL) 2425414c70cbSLiam Girdwood return; 2426414c70cbSLiam Girdwood 2427414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 24286bf87d17SMark Brown WARN_ON(rdev->open_count); 24290f1d747bSMike Rapoport unset_regulator_supplies(rdev); 2430414c70cbSLiam Girdwood list_del(&rdev->list); 2431414c70cbSLiam Girdwood if (rdev->supply) 2432414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, "supply"); 2433414c70cbSLiam Girdwood device_unregister(&rdev->dev); 2434414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2435414c70cbSLiam Girdwood } 2436414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister); 2437414c70cbSLiam Girdwood 2438414c70cbSLiam Girdwood /** 2439cf7bbcdfSMark Brown * regulator_suspend_prepare - prepare regulators for system wide suspend 2440414c70cbSLiam Girdwood * @state: system suspend state 2441414c70cbSLiam Girdwood * 2442414c70cbSLiam Girdwood * Configure each regulator with it's suspend operating parameters for state. 2443414c70cbSLiam Girdwood * This will usually be called by machine suspend code prior to supending. 2444414c70cbSLiam Girdwood */ 2445414c70cbSLiam Girdwood int regulator_suspend_prepare(suspend_state_t state) 2446414c70cbSLiam Girdwood { 2447414c70cbSLiam Girdwood struct regulator_dev *rdev; 2448414c70cbSLiam Girdwood int ret = 0; 2449414c70cbSLiam Girdwood 2450414c70cbSLiam Girdwood /* ON is handled by regulator active state */ 2451414c70cbSLiam Girdwood if (state == PM_SUSPEND_ON) 2452414c70cbSLiam Girdwood return -EINVAL; 2453414c70cbSLiam Girdwood 2454414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2455414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 2456414c70cbSLiam Girdwood 2457414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2458414c70cbSLiam Girdwood ret = suspend_prepare(rdev, state); 2459414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2460414c70cbSLiam Girdwood 2461414c70cbSLiam Girdwood if (ret < 0) { 2462414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to prepare %s\n", 24631083c393SMark Brown __func__, rdev_get_name(rdev)); 2464414c70cbSLiam Girdwood goto out; 2465414c70cbSLiam Girdwood } 2466414c70cbSLiam Girdwood } 2467414c70cbSLiam Girdwood out: 2468414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2469414c70cbSLiam Girdwood return ret; 2470414c70cbSLiam Girdwood } 2471414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2472414c70cbSLiam Girdwood 2473414c70cbSLiam Girdwood /** 2474ca725561SMark Brown * regulator_has_full_constraints - the system has fully specified constraints 2475ca725561SMark Brown * 2476ca725561SMark Brown * Calling this function will cause the regulator API to disable all 2477ca725561SMark Brown * regulators which have a zero use count and don't have an always_on 2478ca725561SMark Brown * constraint in a late_initcall. 2479ca725561SMark Brown * 2480ca725561SMark Brown * The intention is that this will become the default behaviour in a 2481ca725561SMark Brown * future kernel release so users are encouraged to use this facility 2482ca725561SMark Brown * now. 2483ca725561SMark Brown */ 2484ca725561SMark Brown void regulator_has_full_constraints(void) 2485ca725561SMark Brown { 2486ca725561SMark Brown has_full_constraints = 1; 2487ca725561SMark Brown } 2488ca725561SMark Brown EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2489ca725561SMark Brown 2490ca725561SMark Brown /** 2491688fe99aSMark Brown * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2492688fe99aSMark Brown * 2493688fe99aSMark Brown * Calling this function will cause the regulator API to provide a 2494688fe99aSMark Brown * dummy regulator to consumers if no physical regulator is found, 2495688fe99aSMark Brown * allowing most consumers to proceed as though a regulator were 2496688fe99aSMark Brown * configured. This allows systems such as those with software 2497688fe99aSMark Brown * controllable regulators for the CPU core only to be brought up more 2498688fe99aSMark Brown * readily. 2499688fe99aSMark Brown */ 2500688fe99aSMark Brown void regulator_use_dummy_regulator(void) 2501688fe99aSMark Brown { 2502688fe99aSMark Brown board_wants_dummy_regulator = true; 2503688fe99aSMark Brown } 2504688fe99aSMark Brown EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2505688fe99aSMark Brown 2506688fe99aSMark Brown /** 2507414c70cbSLiam Girdwood * rdev_get_drvdata - get rdev regulator driver data 250869279fb9SMark Brown * @rdev: regulator 2509414c70cbSLiam Girdwood * 2510414c70cbSLiam Girdwood * Get rdev regulator driver private data. This call can be used in the 2511414c70cbSLiam Girdwood * regulator driver context. 2512414c70cbSLiam Girdwood */ 2513414c70cbSLiam Girdwood void *rdev_get_drvdata(struct regulator_dev *rdev) 2514414c70cbSLiam Girdwood { 2515414c70cbSLiam Girdwood return rdev->reg_data; 2516414c70cbSLiam Girdwood } 2517414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2518414c70cbSLiam Girdwood 2519414c70cbSLiam Girdwood /** 2520414c70cbSLiam Girdwood * regulator_get_drvdata - get regulator driver data 2521414c70cbSLiam Girdwood * @regulator: regulator 2522414c70cbSLiam Girdwood * 2523414c70cbSLiam Girdwood * Get regulator driver private data. This call can be used in the consumer 2524414c70cbSLiam Girdwood * driver context when non API regulator specific functions need to be called. 2525414c70cbSLiam Girdwood */ 2526414c70cbSLiam Girdwood void *regulator_get_drvdata(struct regulator *regulator) 2527414c70cbSLiam Girdwood { 2528414c70cbSLiam Girdwood return regulator->rdev->reg_data; 2529414c70cbSLiam Girdwood } 2530414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2531414c70cbSLiam Girdwood 2532414c70cbSLiam Girdwood /** 2533414c70cbSLiam Girdwood * regulator_set_drvdata - set regulator driver data 2534414c70cbSLiam Girdwood * @regulator: regulator 2535414c70cbSLiam Girdwood * @data: data 2536414c70cbSLiam Girdwood */ 2537414c70cbSLiam Girdwood void regulator_set_drvdata(struct regulator *regulator, void *data) 2538414c70cbSLiam Girdwood { 2539414c70cbSLiam Girdwood regulator->rdev->reg_data = data; 2540414c70cbSLiam Girdwood } 2541414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2542414c70cbSLiam Girdwood 2543414c70cbSLiam Girdwood /** 2544414c70cbSLiam Girdwood * regulator_get_id - get regulator ID 254569279fb9SMark Brown * @rdev: regulator 2546414c70cbSLiam Girdwood */ 2547414c70cbSLiam Girdwood int rdev_get_id(struct regulator_dev *rdev) 2548414c70cbSLiam Girdwood { 2549414c70cbSLiam Girdwood return rdev->desc->id; 2550414c70cbSLiam Girdwood } 2551414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_id); 2552414c70cbSLiam Girdwood 2553a5766f11SLiam Girdwood struct device *rdev_get_dev(struct regulator_dev *rdev) 2554a5766f11SLiam Girdwood { 2555a5766f11SLiam Girdwood return &rdev->dev; 2556a5766f11SLiam Girdwood } 2557a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_dev); 2558a5766f11SLiam Girdwood 2559a5766f11SLiam Girdwood void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2560a5766f11SLiam Girdwood { 2561a5766f11SLiam Girdwood return reg_init_data->driver_data; 2562a5766f11SLiam Girdwood } 2563a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2564a5766f11SLiam Girdwood 2565414c70cbSLiam Girdwood static int __init regulator_init(void) 2566414c70cbSLiam Girdwood { 256734abbd68SMark Brown int ret; 256834abbd68SMark Brown 2569414c70cbSLiam Girdwood printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 257034abbd68SMark Brown 257134abbd68SMark Brown ret = class_register(®ulator_class); 257234abbd68SMark Brown 257334abbd68SMark Brown regulator_dummy_init(); 257434abbd68SMark Brown 257534abbd68SMark Brown return ret; 2576414c70cbSLiam Girdwood } 2577414c70cbSLiam Girdwood 2578414c70cbSLiam Girdwood /* init early to allow our consumers to complete system booting */ 2579414c70cbSLiam Girdwood core_initcall(regulator_init); 2580ca725561SMark Brown 2581ca725561SMark Brown static int __init regulator_init_complete(void) 2582ca725561SMark Brown { 2583ca725561SMark Brown struct regulator_dev *rdev; 2584ca725561SMark Brown struct regulator_ops *ops; 2585ca725561SMark Brown struct regulation_constraints *c; 2586ca725561SMark Brown int enabled, ret; 2587ca725561SMark Brown const char *name; 2588ca725561SMark Brown 2589ca725561SMark Brown mutex_lock(®ulator_list_mutex); 2590ca725561SMark Brown 2591ca725561SMark Brown /* If we have a full configuration then disable any regulators 2592ca725561SMark Brown * which are not in use or always_on. This will become the 2593ca725561SMark Brown * default behaviour in the future. 2594ca725561SMark Brown */ 2595ca725561SMark Brown list_for_each_entry(rdev, ®ulator_list, list) { 2596ca725561SMark Brown ops = rdev->desc->ops; 2597ca725561SMark Brown c = rdev->constraints; 2598ca725561SMark Brown 25991083c393SMark Brown name = rdev_get_name(rdev); 2600ca725561SMark Brown 2601f25e0b4fSMark Brown if (!ops->disable || (c && c->always_on)) 2602ca725561SMark Brown continue; 2603ca725561SMark Brown 2604ca725561SMark Brown mutex_lock(&rdev->mutex); 2605ca725561SMark Brown 2606ca725561SMark Brown if (rdev->use_count) 2607ca725561SMark Brown goto unlock; 2608ca725561SMark Brown 2609ca725561SMark Brown /* If we can't read the status assume it's on. */ 2610ca725561SMark Brown if (ops->is_enabled) 2611ca725561SMark Brown enabled = ops->is_enabled(rdev); 2612ca725561SMark Brown else 2613ca725561SMark Brown enabled = 1; 2614ca725561SMark Brown 2615ca725561SMark Brown if (!enabled) 2616ca725561SMark Brown goto unlock; 2617ca725561SMark Brown 2618ca725561SMark Brown if (has_full_constraints) { 2619ca725561SMark Brown /* We log since this may kill the system if it 2620ca725561SMark Brown * goes wrong. */ 2621ca725561SMark Brown printk(KERN_INFO "%s: disabling %s\n", 2622ca725561SMark Brown __func__, name); 2623ca725561SMark Brown ret = ops->disable(rdev); 2624ca725561SMark Brown if (ret != 0) { 2625ca725561SMark Brown printk(KERN_ERR 2626ca725561SMark Brown "%s: couldn't disable %s: %d\n", 2627ca725561SMark Brown __func__, name, ret); 2628ca725561SMark Brown } 2629ca725561SMark Brown } else { 2630ca725561SMark Brown /* The intention is that in future we will 2631ca725561SMark Brown * assume that full constraints are provided 2632ca725561SMark Brown * so warn even if we aren't going to do 2633ca725561SMark Brown * anything here. 2634ca725561SMark Brown */ 2635ca725561SMark Brown printk(KERN_WARNING 2636ca725561SMark Brown "%s: incomplete constraints, leaving %s on\n", 2637ca725561SMark Brown __func__, name); 2638ca725561SMark Brown } 2639ca725561SMark Brown 2640ca725561SMark Brown unlock: 2641ca725561SMark Brown mutex_unlock(&rdev->mutex); 2642ca725561SMark Brown } 2643ca725561SMark Brown 2644ca725561SMark Brown mutex_unlock(®ulator_list_mutex); 2645ca725561SMark Brown 2646ca725561SMark Brown return 0; 2647ca725561SMark Brown } 2648ca725561SMark Brown late_initcall(regulator_init_complete); 2649