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; 36414c70cbSLiam Girdwood 378dc5390dSMark Brown /* 38414c70cbSLiam Girdwood * struct regulator_map 39414c70cbSLiam Girdwood * 40414c70cbSLiam Girdwood * Used to provide symbolic supply names to devices. 41414c70cbSLiam Girdwood */ 42414c70cbSLiam Girdwood struct regulator_map { 43414c70cbSLiam Girdwood struct list_head list; 4440f9244fSMark Brown const char *dev_name; /* The dev_name() for the consumer */ 45414c70cbSLiam Girdwood const char *supply; 46a5766f11SLiam Girdwood struct regulator_dev *regulator; 47414c70cbSLiam Girdwood }; 48414c70cbSLiam Girdwood 49414c70cbSLiam Girdwood /* 50414c70cbSLiam Girdwood * struct regulator 51414c70cbSLiam Girdwood * 52414c70cbSLiam Girdwood * One for each consumer device. 53414c70cbSLiam Girdwood */ 54414c70cbSLiam Girdwood struct regulator { 55414c70cbSLiam Girdwood struct device *dev; 56414c70cbSLiam Girdwood struct list_head list; 57414c70cbSLiam Girdwood int uA_load; 58414c70cbSLiam Girdwood int min_uV; 59414c70cbSLiam Girdwood int max_uV; 60414c70cbSLiam Girdwood char *supply_name; 61414c70cbSLiam Girdwood struct device_attribute dev_attr; 62414c70cbSLiam Girdwood struct regulator_dev *rdev; 63414c70cbSLiam Girdwood }; 64414c70cbSLiam Girdwood 65414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev); 66414c70cbSLiam Girdwood static int _regulator_disable(struct regulator_dev *rdev); 67414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev); 68414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev); 69414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 70414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 71414c70cbSLiam Girdwood unsigned long event, void *data); 72414c70cbSLiam Girdwood 731083c393SMark Brown static const char *rdev_get_name(struct regulator_dev *rdev) 741083c393SMark Brown { 751083c393SMark Brown if (rdev->constraints && rdev->constraints->name) 761083c393SMark Brown return rdev->constraints->name; 771083c393SMark Brown else if (rdev->desc->name) 781083c393SMark Brown return rdev->desc->name; 791083c393SMark Brown else 801083c393SMark Brown return ""; 811083c393SMark Brown } 821083c393SMark Brown 83414c70cbSLiam Girdwood /* gets the regulator for a given consumer device */ 84414c70cbSLiam Girdwood static struct regulator *get_device_regulator(struct device *dev) 85414c70cbSLiam Girdwood { 86414c70cbSLiam Girdwood struct regulator *regulator = NULL; 87414c70cbSLiam Girdwood struct regulator_dev *rdev; 88414c70cbSLiam Girdwood 89414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 90414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 91414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 92414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) { 93414c70cbSLiam Girdwood if (regulator->dev == dev) { 94414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 95414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 96414c70cbSLiam Girdwood return regulator; 97414c70cbSLiam Girdwood } 98414c70cbSLiam Girdwood } 99414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 100414c70cbSLiam Girdwood } 101414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 102414c70cbSLiam Girdwood return NULL; 103414c70cbSLiam Girdwood } 104414c70cbSLiam Girdwood 105414c70cbSLiam Girdwood /* Platform voltage constraint check */ 106414c70cbSLiam Girdwood static int regulator_check_voltage(struct regulator_dev *rdev, 107414c70cbSLiam Girdwood int *min_uV, int *max_uV) 108414c70cbSLiam Girdwood { 109414c70cbSLiam Girdwood BUG_ON(*min_uV > *max_uV); 110414c70cbSLiam Girdwood 111414c70cbSLiam Girdwood if (!rdev->constraints) { 112414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1131083c393SMark Brown rdev_get_name(rdev)); 114414c70cbSLiam Girdwood return -ENODEV; 115414c70cbSLiam Girdwood } 116414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 117414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1181083c393SMark Brown __func__, rdev_get_name(rdev)); 119414c70cbSLiam Girdwood return -EPERM; 120414c70cbSLiam Girdwood } 121414c70cbSLiam Girdwood 122414c70cbSLiam Girdwood if (*max_uV > rdev->constraints->max_uV) 123414c70cbSLiam Girdwood *max_uV = rdev->constraints->max_uV; 124414c70cbSLiam Girdwood if (*min_uV < rdev->constraints->min_uV) 125414c70cbSLiam Girdwood *min_uV = rdev->constraints->min_uV; 126414c70cbSLiam Girdwood 127414c70cbSLiam Girdwood if (*min_uV > *max_uV) 128414c70cbSLiam Girdwood return -EINVAL; 129414c70cbSLiam Girdwood 130414c70cbSLiam Girdwood return 0; 131414c70cbSLiam Girdwood } 132414c70cbSLiam Girdwood 133414c70cbSLiam Girdwood /* current constraint check */ 134414c70cbSLiam Girdwood static int regulator_check_current_limit(struct regulator_dev *rdev, 135414c70cbSLiam Girdwood int *min_uA, int *max_uA) 136414c70cbSLiam Girdwood { 137414c70cbSLiam Girdwood BUG_ON(*min_uA > *max_uA); 138414c70cbSLiam Girdwood 139414c70cbSLiam Girdwood if (!rdev->constraints) { 140414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1411083c393SMark Brown rdev_get_name(rdev)); 142414c70cbSLiam Girdwood return -ENODEV; 143414c70cbSLiam Girdwood } 144414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 145414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1461083c393SMark Brown __func__, rdev_get_name(rdev)); 147414c70cbSLiam Girdwood return -EPERM; 148414c70cbSLiam Girdwood } 149414c70cbSLiam Girdwood 150414c70cbSLiam Girdwood if (*max_uA > rdev->constraints->max_uA) 151414c70cbSLiam Girdwood *max_uA = rdev->constraints->max_uA; 152414c70cbSLiam Girdwood if (*min_uA < rdev->constraints->min_uA) 153414c70cbSLiam Girdwood *min_uA = rdev->constraints->min_uA; 154414c70cbSLiam Girdwood 155414c70cbSLiam Girdwood if (*min_uA > *max_uA) 156414c70cbSLiam Girdwood return -EINVAL; 157414c70cbSLiam Girdwood 158414c70cbSLiam Girdwood return 0; 159414c70cbSLiam Girdwood } 160414c70cbSLiam Girdwood 161414c70cbSLiam Girdwood /* operating mode constraint check */ 162414c70cbSLiam Girdwood static int regulator_check_mode(struct regulator_dev *rdev, int mode) 163414c70cbSLiam Girdwood { 164e573520bSDavid Brownell switch (mode) { 165e573520bSDavid Brownell case REGULATOR_MODE_FAST: 166e573520bSDavid Brownell case REGULATOR_MODE_NORMAL: 167e573520bSDavid Brownell case REGULATOR_MODE_IDLE: 168e573520bSDavid Brownell case REGULATOR_MODE_STANDBY: 169e573520bSDavid Brownell break; 170e573520bSDavid Brownell default: 171e573520bSDavid Brownell return -EINVAL; 172e573520bSDavid Brownell } 173e573520bSDavid Brownell 174414c70cbSLiam Girdwood if (!rdev->constraints) { 175414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1761083c393SMark Brown rdev_get_name(rdev)); 177414c70cbSLiam Girdwood return -ENODEV; 178414c70cbSLiam Girdwood } 179414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 180414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1811083c393SMark Brown __func__, rdev_get_name(rdev)); 182414c70cbSLiam Girdwood return -EPERM; 183414c70cbSLiam Girdwood } 184414c70cbSLiam Girdwood if (!(rdev->constraints->valid_modes_mask & mode)) { 185414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid mode %x for %s\n", 1861083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 187414c70cbSLiam Girdwood return -EINVAL; 188414c70cbSLiam Girdwood } 189414c70cbSLiam Girdwood return 0; 190414c70cbSLiam Girdwood } 191414c70cbSLiam Girdwood 192414c70cbSLiam Girdwood /* dynamic regulator mode switching constraint check */ 193414c70cbSLiam Girdwood static int regulator_check_drms(struct regulator_dev *rdev) 194414c70cbSLiam Girdwood { 195414c70cbSLiam Girdwood if (!rdev->constraints) { 196414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1971083c393SMark Brown rdev_get_name(rdev)); 198414c70cbSLiam Girdwood return -ENODEV; 199414c70cbSLiam Girdwood } 200414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 201414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 2021083c393SMark Brown __func__, rdev_get_name(rdev)); 203414c70cbSLiam Girdwood return -EPERM; 204414c70cbSLiam Girdwood } 205414c70cbSLiam Girdwood return 0; 206414c70cbSLiam Girdwood } 207414c70cbSLiam Girdwood 208414c70cbSLiam Girdwood static ssize_t device_requested_uA_show(struct device *dev, 209414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 210414c70cbSLiam Girdwood { 211414c70cbSLiam Girdwood struct regulator *regulator; 212414c70cbSLiam Girdwood 213414c70cbSLiam Girdwood regulator = get_device_regulator(dev); 214414c70cbSLiam Girdwood if (regulator == NULL) 215414c70cbSLiam Girdwood return 0; 216414c70cbSLiam Girdwood 217414c70cbSLiam Girdwood return sprintf(buf, "%d\n", regulator->uA_load); 218414c70cbSLiam Girdwood } 219414c70cbSLiam Girdwood 220414c70cbSLiam Girdwood static ssize_t regulator_uV_show(struct device *dev, 221414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 222414c70cbSLiam Girdwood { 223a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 224414c70cbSLiam Girdwood ssize_t ret; 225414c70cbSLiam Girdwood 226414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 227414c70cbSLiam Girdwood ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 228414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 229414c70cbSLiam Girdwood 230414c70cbSLiam Girdwood return ret; 231414c70cbSLiam Girdwood } 2327ad68e2fSDavid Brownell static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 233414c70cbSLiam Girdwood 234414c70cbSLiam Girdwood static ssize_t regulator_uA_show(struct device *dev, 235414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 236414c70cbSLiam Girdwood { 237a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 238414c70cbSLiam Girdwood 239414c70cbSLiam Girdwood return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 240414c70cbSLiam Girdwood } 2417ad68e2fSDavid Brownell static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 242414c70cbSLiam Girdwood 243bc558a60SMark Brown static ssize_t regulator_name_show(struct device *dev, 244bc558a60SMark Brown struct device_attribute *attr, char *buf) 245bc558a60SMark Brown { 246bc558a60SMark Brown struct regulator_dev *rdev = dev_get_drvdata(dev); 247bc558a60SMark Brown 2481083c393SMark Brown return sprintf(buf, "%s\n", rdev_get_name(rdev)); 249bc558a60SMark Brown } 250bc558a60SMark Brown 2514fca9545SDavid Brownell static ssize_t regulator_print_opmode(char *buf, int mode) 252414c70cbSLiam Girdwood { 253414c70cbSLiam Girdwood switch (mode) { 254414c70cbSLiam Girdwood case REGULATOR_MODE_FAST: 255414c70cbSLiam Girdwood return sprintf(buf, "fast\n"); 256414c70cbSLiam Girdwood case REGULATOR_MODE_NORMAL: 257414c70cbSLiam Girdwood return sprintf(buf, "normal\n"); 258414c70cbSLiam Girdwood case REGULATOR_MODE_IDLE: 259414c70cbSLiam Girdwood return sprintf(buf, "idle\n"); 260414c70cbSLiam Girdwood case REGULATOR_MODE_STANDBY: 261414c70cbSLiam Girdwood return sprintf(buf, "standby\n"); 262414c70cbSLiam Girdwood } 263414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 264414c70cbSLiam Girdwood } 265414c70cbSLiam Girdwood 2664fca9545SDavid Brownell static ssize_t regulator_opmode_show(struct device *dev, 267414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 268414c70cbSLiam Girdwood { 269a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 270414c70cbSLiam Girdwood 2714fca9545SDavid Brownell return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 2724fca9545SDavid Brownell } 2737ad68e2fSDavid Brownell static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 2744fca9545SDavid Brownell 2754fca9545SDavid Brownell static ssize_t regulator_print_state(char *buf, int state) 2764fca9545SDavid Brownell { 277414c70cbSLiam Girdwood if (state > 0) 278414c70cbSLiam Girdwood return sprintf(buf, "enabled\n"); 279414c70cbSLiam Girdwood else if (state == 0) 280414c70cbSLiam Girdwood return sprintf(buf, "disabled\n"); 281414c70cbSLiam Girdwood else 282414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 283414c70cbSLiam Girdwood } 284414c70cbSLiam Girdwood 2854fca9545SDavid Brownell static ssize_t regulator_state_show(struct device *dev, 2864fca9545SDavid Brownell struct device_attribute *attr, char *buf) 2874fca9545SDavid Brownell { 2884fca9545SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 2899332546fSMark Brown ssize_t ret; 2904fca9545SDavid Brownell 2919332546fSMark Brown mutex_lock(&rdev->mutex); 2929332546fSMark Brown ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 2939332546fSMark Brown mutex_unlock(&rdev->mutex); 2949332546fSMark Brown 2959332546fSMark Brown return ret; 2964fca9545SDavid Brownell } 2977ad68e2fSDavid Brownell static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 2984fca9545SDavid Brownell 299853116a1SDavid Brownell static ssize_t regulator_status_show(struct device *dev, 300853116a1SDavid Brownell struct device_attribute *attr, char *buf) 301853116a1SDavid Brownell { 302853116a1SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 303853116a1SDavid Brownell int status; 304853116a1SDavid Brownell char *label; 305853116a1SDavid Brownell 306853116a1SDavid Brownell status = rdev->desc->ops->get_status(rdev); 307853116a1SDavid Brownell if (status < 0) 308853116a1SDavid Brownell return status; 309853116a1SDavid Brownell 310853116a1SDavid Brownell switch (status) { 311853116a1SDavid Brownell case REGULATOR_STATUS_OFF: 312853116a1SDavid Brownell label = "off"; 313853116a1SDavid Brownell break; 314853116a1SDavid Brownell case REGULATOR_STATUS_ON: 315853116a1SDavid Brownell label = "on"; 316853116a1SDavid Brownell break; 317853116a1SDavid Brownell case REGULATOR_STATUS_ERROR: 318853116a1SDavid Brownell label = "error"; 319853116a1SDavid Brownell break; 320853116a1SDavid Brownell case REGULATOR_STATUS_FAST: 321853116a1SDavid Brownell label = "fast"; 322853116a1SDavid Brownell break; 323853116a1SDavid Brownell case REGULATOR_STATUS_NORMAL: 324853116a1SDavid Brownell label = "normal"; 325853116a1SDavid Brownell break; 326853116a1SDavid Brownell case REGULATOR_STATUS_IDLE: 327853116a1SDavid Brownell label = "idle"; 328853116a1SDavid Brownell break; 329853116a1SDavid Brownell case REGULATOR_STATUS_STANDBY: 330853116a1SDavid Brownell label = "standby"; 331853116a1SDavid Brownell break; 332853116a1SDavid Brownell default: 333853116a1SDavid Brownell return -ERANGE; 334853116a1SDavid Brownell } 335853116a1SDavid Brownell 336853116a1SDavid Brownell return sprintf(buf, "%s\n", label); 337853116a1SDavid Brownell } 338853116a1SDavid Brownell static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 339853116a1SDavid Brownell 340414c70cbSLiam Girdwood static ssize_t regulator_min_uA_show(struct device *dev, 341414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 342414c70cbSLiam Girdwood { 343a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 344414c70cbSLiam Girdwood 345414c70cbSLiam Girdwood if (!rdev->constraints) 346414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 347414c70cbSLiam Girdwood 348414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uA); 349414c70cbSLiam Girdwood } 3507ad68e2fSDavid Brownell static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 351414c70cbSLiam Girdwood 352414c70cbSLiam Girdwood static ssize_t regulator_max_uA_show(struct device *dev, 353414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 354414c70cbSLiam Girdwood { 355a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 356414c70cbSLiam Girdwood 357414c70cbSLiam Girdwood if (!rdev->constraints) 358414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 359414c70cbSLiam Girdwood 360414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uA); 361414c70cbSLiam Girdwood } 3627ad68e2fSDavid Brownell static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 363414c70cbSLiam Girdwood 364414c70cbSLiam Girdwood static ssize_t regulator_min_uV_show(struct device *dev, 365414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 366414c70cbSLiam Girdwood { 367a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 368414c70cbSLiam Girdwood 369414c70cbSLiam Girdwood if (!rdev->constraints) 370414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 371414c70cbSLiam Girdwood 372414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uV); 373414c70cbSLiam Girdwood } 3747ad68e2fSDavid Brownell static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 375414c70cbSLiam Girdwood 376414c70cbSLiam Girdwood static ssize_t regulator_max_uV_show(struct device *dev, 377414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 378414c70cbSLiam Girdwood { 379a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 380414c70cbSLiam Girdwood 381414c70cbSLiam Girdwood if (!rdev->constraints) 382414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 383414c70cbSLiam Girdwood 384414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uV); 385414c70cbSLiam Girdwood } 3867ad68e2fSDavid Brownell static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 387414c70cbSLiam Girdwood 388414c70cbSLiam Girdwood static ssize_t regulator_total_uA_show(struct device *dev, 389414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 390414c70cbSLiam Girdwood { 391a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 392414c70cbSLiam Girdwood struct regulator *regulator; 393414c70cbSLiam Girdwood int uA = 0; 394414c70cbSLiam Girdwood 395414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 396414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) 397414c70cbSLiam Girdwood uA += regulator->uA_load; 398414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 399414c70cbSLiam Girdwood return sprintf(buf, "%d\n", uA); 400414c70cbSLiam Girdwood } 4017ad68e2fSDavid Brownell static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 402414c70cbSLiam Girdwood 403414c70cbSLiam Girdwood static ssize_t regulator_num_users_show(struct device *dev, 404414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 405414c70cbSLiam Girdwood { 406a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 407414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->use_count); 408414c70cbSLiam Girdwood } 409414c70cbSLiam Girdwood 410414c70cbSLiam Girdwood static ssize_t regulator_type_show(struct device *dev, 411414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 412414c70cbSLiam Girdwood { 413a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 414414c70cbSLiam Girdwood 415414c70cbSLiam Girdwood switch (rdev->desc->type) { 416414c70cbSLiam Girdwood case REGULATOR_VOLTAGE: 417414c70cbSLiam Girdwood return sprintf(buf, "voltage\n"); 418414c70cbSLiam Girdwood case REGULATOR_CURRENT: 419414c70cbSLiam Girdwood return sprintf(buf, "current\n"); 420414c70cbSLiam Girdwood } 421414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 422414c70cbSLiam Girdwood } 423414c70cbSLiam Girdwood 424414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 425414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 426414c70cbSLiam Girdwood { 427a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 428414c70cbSLiam Girdwood 429414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 430414c70cbSLiam Girdwood } 4317ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_microvolts, 0444, 4327ad68e2fSDavid Brownell regulator_suspend_mem_uV_show, NULL); 433414c70cbSLiam Girdwood 434414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 435414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 436414c70cbSLiam Girdwood { 437a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 438414c70cbSLiam Girdwood 439414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 440414c70cbSLiam Girdwood } 4417ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_microvolts, 0444, 4427ad68e2fSDavid Brownell regulator_suspend_disk_uV_show, NULL); 443414c70cbSLiam Girdwood 444414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 445414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 446414c70cbSLiam Girdwood { 447a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 448414c70cbSLiam Girdwood 449414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 450414c70cbSLiam Girdwood } 4517ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_microvolts, 0444, 4527ad68e2fSDavid Brownell regulator_suspend_standby_uV_show, NULL); 453414c70cbSLiam Girdwood 454414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 455414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 456414c70cbSLiam Girdwood { 457a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 458414c70cbSLiam Girdwood 4594fca9545SDavid Brownell return regulator_print_opmode(buf, 4604fca9545SDavid Brownell rdev->constraints->state_mem.mode); 461414c70cbSLiam Girdwood } 4627ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_mode, 0444, 4637ad68e2fSDavid Brownell regulator_suspend_mem_mode_show, NULL); 464414c70cbSLiam Girdwood 465414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 466414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 467414c70cbSLiam Girdwood { 468a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 469414c70cbSLiam Girdwood 4704fca9545SDavid Brownell return regulator_print_opmode(buf, 4714fca9545SDavid Brownell rdev->constraints->state_disk.mode); 472414c70cbSLiam Girdwood } 4737ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_mode, 0444, 4747ad68e2fSDavid Brownell regulator_suspend_disk_mode_show, NULL); 475414c70cbSLiam Girdwood 476414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 477414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 478414c70cbSLiam Girdwood { 479a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 480414c70cbSLiam Girdwood 4814fca9545SDavid Brownell return regulator_print_opmode(buf, 4824fca9545SDavid Brownell rdev->constraints->state_standby.mode); 483414c70cbSLiam Girdwood } 4847ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_mode, 0444, 4857ad68e2fSDavid Brownell regulator_suspend_standby_mode_show, NULL); 486414c70cbSLiam Girdwood 487414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_state_show(struct device *dev, 488414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 489414c70cbSLiam Girdwood { 490a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 491414c70cbSLiam Girdwood 4924fca9545SDavid Brownell return regulator_print_state(buf, 4934fca9545SDavid Brownell rdev->constraints->state_mem.enabled); 494414c70cbSLiam Girdwood } 4957ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_state, 0444, 4967ad68e2fSDavid Brownell regulator_suspend_mem_state_show, NULL); 497414c70cbSLiam Girdwood 498414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_state_show(struct device *dev, 499414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 500414c70cbSLiam Girdwood { 501a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 502414c70cbSLiam Girdwood 5034fca9545SDavid Brownell return regulator_print_state(buf, 5044fca9545SDavid Brownell rdev->constraints->state_disk.enabled); 505414c70cbSLiam Girdwood } 5067ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_state, 0444, 5077ad68e2fSDavid Brownell regulator_suspend_disk_state_show, NULL); 508414c70cbSLiam Girdwood 509414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_state_show(struct device *dev, 510414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 511414c70cbSLiam Girdwood { 512a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 513414c70cbSLiam Girdwood 5144fca9545SDavid Brownell return regulator_print_state(buf, 5154fca9545SDavid Brownell rdev->constraints->state_standby.enabled); 516414c70cbSLiam Girdwood } 5177ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_state, 0444, 5187ad68e2fSDavid Brownell regulator_suspend_standby_state_show, NULL); 519bc558a60SMark Brown 5207ad68e2fSDavid Brownell 5217ad68e2fSDavid Brownell /* 5227ad68e2fSDavid Brownell * These are the only attributes are present for all regulators. 5237ad68e2fSDavid Brownell * Other attributes are a function of regulator functionality. 5247ad68e2fSDavid Brownell */ 525414c70cbSLiam Girdwood static struct device_attribute regulator_dev_attrs[] = { 526bc558a60SMark Brown __ATTR(name, 0444, regulator_name_show, NULL), 527414c70cbSLiam Girdwood __ATTR(num_users, 0444, regulator_num_users_show, NULL), 528414c70cbSLiam Girdwood __ATTR(type, 0444, regulator_type_show, NULL), 529414c70cbSLiam Girdwood __ATTR_NULL, 530414c70cbSLiam Girdwood }; 531414c70cbSLiam Girdwood 532414c70cbSLiam Girdwood static void regulator_dev_release(struct device *dev) 533414c70cbSLiam Girdwood { 534a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 535414c70cbSLiam Girdwood kfree(rdev); 536414c70cbSLiam Girdwood } 537414c70cbSLiam Girdwood 538414c70cbSLiam Girdwood static struct class regulator_class = { 539414c70cbSLiam Girdwood .name = "regulator", 540414c70cbSLiam Girdwood .dev_release = regulator_dev_release, 541414c70cbSLiam Girdwood .dev_attrs = regulator_dev_attrs, 542414c70cbSLiam Girdwood }; 543414c70cbSLiam Girdwood 544414c70cbSLiam Girdwood /* Calculate the new optimum regulator operating mode based on the new total 545414c70cbSLiam Girdwood * consumer load. All locks held by caller */ 546414c70cbSLiam Girdwood static void drms_uA_update(struct regulator_dev *rdev) 547414c70cbSLiam Girdwood { 548414c70cbSLiam Girdwood struct regulator *sibling; 549414c70cbSLiam Girdwood int current_uA = 0, output_uV, input_uV, err; 550414c70cbSLiam Girdwood unsigned int mode; 551414c70cbSLiam Girdwood 552414c70cbSLiam Girdwood err = regulator_check_drms(rdev); 553414c70cbSLiam Girdwood if (err < 0 || !rdev->desc->ops->get_optimum_mode || 554036de8efSDan Carpenter !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) 555414c70cbSLiam Girdwood return; 556414c70cbSLiam Girdwood 557414c70cbSLiam Girdwood /* get output voltage */ 558414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 559414c70cbSLiam Girdwood if (output_uV <= 0) 560414c70cbSLiam Girdwood return; 561414c70cbSLiam Girdwood 562414c70cbSLiam Girdwood /* get input voltage */ 563414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 564414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 565414c70cbSLiam Girdwood else 566414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 567414c70cbSLiam Girdwood if (input_uV <= 0) 568414c70cbSLiam Girdwood return; 569414c70cbSLiam Girdwood 570414c70cbSLiam Girdwood /* calc total requested load */ 571414c70cbSLiam Girdwood list_for_each_entry(sibling, &rdev->consumer_list, list) 572414c70cbSLiam Girdwood current_uA += sibling->uA_load; 573414c70cbSLiam Girdwood 574414c70cbSLiam Girdwood /* now get the optimum mode for our new total regulator load */ 575414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 576414c70cbSLiam Girdwood output_uV, current_uA); 577414c70cbSLiam Girdwood 578414c70cbSLiam Girdwood /* check the new mode is allowed */ 579414c70cbSLiam Girdwood err = regulator_check_mode(rdev, mode); 580414c70cbSLiam Girdwood if (err == 0) 581414c70cbSLiam Girdwood rdev->desc->ops->set_mode(rdev, mode); 582414c70cbSLiam Girdwood } 583414c70cbSLiam Girdwood 584414c70cbSLiam Girdwood static int suspend_set_state(struct regulator_dev *rdev, 585414c70cbSLiam Girdwood struct regulator_state *rstate) 586414c70cbSLiam Girdwood { 587414c70cbSLiam Girdwood int ret = 0; 588638f85c5SMark Brown bool can_set_state; 589414c70cbSLiam Girdwood 590638f85c5SMark Brown can_set_state = rdev->desc->ops->set_suspend_enable && 591638f85c5SMark Brown rdev->desc->ops->set_suspend_disable; 592638f85c5SMark Brown 593638f85c5SMark Brown /* If we have no suspend mode configration don't set anything; 594638f85c5SMark Brown * only warn if the driver actually makes the suspend mode 595638f85c5SMark Brown * configurable. 596638f85c5SMark Brown */ 597638f85c5SMark Brown if (!rstate->enabled && !rstate->disabled) { 598638f85c5SMark Brown if (can_set_state) 599638f85c5SMark Brown printk(KERN_WARNING "%s: No configuration for %s\n", 600638f85c5SMark Brown __func__, rdev_get_name(rdev)); 601638f85c5SMark Brown return 0; 602638f85c5SMark Brown } 603638f85c5SMark Brown 604638f85c5SMark Brown if (rstate->enabled && rstate->disabled) { 605638f85c5SMark Brown printk(KERN_ERR "%s: invalid configuration for %s\n", 606638f85c5SMark Brown __func__, rdev_get_name(rdev)); 607638f85c5SMark Brown return -EINVAL; 608638f85c5SMark Brown } 609638f85c5SMark Brown 610638f85c5SMark Brown if (!can_set_state) { 611a5766f11SLiam Girdwood printk(KERN_ERR "%s: no way to set suspend state\n", 612a5766f11SLiam Girdwood __func__); 613414c70cbSLiam Girdwood return -EINVAL; 614a5766f11SLiam Girdwood } 615414c70cbSLiam Girdwood 616414c70cbSLiam Girdwood if (rstate->enabled) 617414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_enable(rdev); 618414c70cbSLiam Girdwood else 619414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_disable(rdev); 620414c70cbSLiam Girdwood if (ret < 0) { 621414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 622414c70cbSLiam Girdwood return ret; 623414c70cbSLiam Girdwood } 624414c70cbSLiam Girdwood 625414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 626414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 627414c70cbSLiam Girdwood if (ret < 0) { 628414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set voltage\n", 629414c70cbSLiam Girdwood __func__); 630414c70cbSLiam Girdwood return ret; 631414c70cbSLiam Girdwood } 632414c70cbSLiam Girdwood } 633414c70cbSLiam Girdwood 634414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 635414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 636414c70cbSLiam Girdwood if (ret < 0) { 637414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set mode\n", __func__); 638414c70cbSLiam Girdwood return ret; 639414c70cbSLiam Girdwood } 640414c70cbSLiam Girdwood } 641414c70cbSLiam Girdwood return ret; 642414c70cbSLiam Girdwood } 643414c70cbSLiam Girdwood 644414c70cbSLiam Girdwood /* locks held by caller */ 645414c70cbSLiam Girdwood static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 646414c70cbSLiam Girdwood { 647414c70cbSLiam Girdwood if (!rdev->constraints) 648414c70cbSLiam Girdwood return -EINVAL; 649414c70cbSLiam Girdwood 650414c70cbSLiam Girdwood switch (state) { 651414c70cbSLiam Girdwood case PM_SUSPEND_STANDBY: 652414c70cbSLiam Girdwood return suspend_set_state(rdev, 653414c70cbSLiam Girdwood &rdev->constraints->state_standby); 654414c70cbSLiam Girdwood case PM_SUSPEND_MEM: 655414c70cbSLiam Girdwood return suspend_set_state(rdev, 656414c70cbSLiam Girdwood &rdev->constraints->state_mem); 657414c70cbSLiam Girdwood case PM_SUSPEND_MAX: 658414c70cbSLiam Girdwood return suspend_set_state(rdev, 659414c70cbSLiam Girdwood &rdev->constraints->state_disk); 660414c70cbSLiam Girdwood default: 661414c70cbSLiam Girdwood return -EINVAL; 662414c70cbSLiam Girdwood } 663414c70cbSLiam Girdwood } 664414c70cbSLiam Girdwood 665414c70cbSLiam Girdwood static void print_constraints(struct regulator_dev *rdev) 666414c70cbSLiam Girdwood { 667414c70cbSLiam Girdwood struct regulation_constraints *constraints = rdev->constraints; 668973e9a27SMark Brown char buf[80] = ""; 6698f031b48SMark Brown int count = 0; 6708f031b48SMark Brown int ret; 671414c70cbSLiam Girdwood 6728f031b48SMark Brown if (constraints->min_uV && constraints->max_uV) { 673414c70cbSLiam Girdwood if (constraints->min_uV == constraints->max_uV) 6748f031b48SMark Brown count += sprintf(buf + count, "%d mV ", 675414c70cbSLiam Girdwood constraints->min_uV / 1000); 676414c70cbSLiam Girdwood else 6778f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mV ", 678414c70cbSLiam Girdwood constraints->min_uV / 1000, 679414c70cbSLiam Girdwood constraints->max_uV / 1000); 6808f031b48SMark Brown } 6818f031b48SMark Brown 6828f031b48SMark Brown if (!constraints->min_uV || 6838f031b48SMark Brown constraints->min_uV != constraints->max_uV) { 6848f031b48SMark Brown ret = _regulator_get_voltage(rdev); 6858f031b48SMark Brown if (ret > 0) 6868f031b48SMark Brown count += sprintf(buf + count, "at %d mV ", ret / 1000); 6878f031b48SMark Brown } 6888f031b48SMark Brown 6898f031b48SMark Brown if (constraints->min_uA && constraints->max_uA) { 690414c70cbSLiam Girdwood if (constraints->min_uA == constraints->max_uA) 6918f031b48SMark Brown count += sprintf(buf + count, "%d mA ", 692414c70cbSLiam Girdwood constraints->min_uA / 1000); 693414c70cbSLiam Girdwood else 6948f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mA ", 695414c70cbSLiam Girdwood constraints->min_uA / 1000, 696414c70cbSLiam Girdwood constraints->max_uA / 1000); 697414c70cbSLiam Girdwood } 6988f031b48SMark Brown 6998f031b48SMark Brown if (!constraints->min_uA || 7008f031b48SMark Brown constraints->min_uA != constraints->max_uA) { 7018f031b48SMark Brown ret = _regulator_get_current_limit(rdev); 7028f031b48SMark Brown if (ret > 0) 7038f031b48SMark Brown count += sprintf(buf + count, "at %d uA ", ret / 1000); 7048f031b48SMark Brown } 7058f031b48SMark Brown 706414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 707414c70cbSLiam Girdwood count += sprintf(buf + count, "fast "); 708414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 709414c70cbSLiam Girdwood count += sprintf(buf + count, "normal "); 710414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 711414c70cbSLiam Girdwood count += sprintf(buf + count, "idle "); 712414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 713414c70cbSLiam Girdwood count += sprintf(buf + count, "standby"); 714414c70cbSLiam Girdwood 7151083c393SMark Brown printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); 716414c70cbSLiam Girdwood } 717414c70cbSLiam Girdwood 718e79055d6SMark Brown static int machine_constraints_voltage(struct regulator_dev *rdev, 7191083c393SMark Brown struct regulation_constraints *constraints) 720e79055d6SMark Brown { 721e79055d6SMark Brown struct regulator_ops *ops = rdev->desc->ops; 7221083c393SMark Brown const char *name = rdev_get_name(rdev); 723af5866c9SMark Brown int ret; 724af5866c9SMark Brown 725af5866c9SMark Brown /* do we need to apply the constraint voltage */ 726af5866c9SMark Brown if (rdev->constraints->apply_uV && 727af5866c9SMark Brown rdev->constraints->min_uV == rdev->constraints->max_uV && 728af5866c9SMark Brown ops->set_voltage) { 729af5866c9SMark Brown ret = ops->set_voltage(rdev, 730af5866c9SMark Brown rdev->constraints->min_uV, rdev->constraints->max_uV); 731af5866c9SMark Brown if (ret < 0) { 732af5866c9SMark Brown printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 733af5866c9SMark Brown __func__, 734af5866c9SMark Brown rdev->constraints->min_uV, name); 735af5866c9SMark Brown rdev->constraints = NULL; 736af5866c9SMark Brown return ret; 737af5866c9SMark Brown } 738af5866c9SMark Brown } 739e79055d6SMark Brown 740e79055d6SMark Brown /* constrain machine-level voltage specs to fit 741e79055d6SMark Brown * the actual range supported by this regulator. 742e79055d6SMark Brown */ 743e79055d6SMark Brown if (ops->list_voltage && rdev->desc->n_voltages) { 744e79055d6SMark Brown int count = rdev->desc->n_voltages; 745e79055d6SMark Brown int i; 746e79055d6SMark Brown int min_uV = INT_MAX; 747e79055d6SMark Brown int max_uV = INT_MIN; 748e79055d6SMark Brown int cmin = constraints->min_uV; 749e79055d6SMark Brown int cmax = constraints->max_uV; 750e79055d6SMark Brown 751e79055d6SMark Brown /* it's safe to autoconfigure fixed-voltage supplies 752e79055d6SMark Brown and the constraints are used by list_voltage. */ 753e79055d6SMark Brown if (count == 1 && !cmin) { 754e79055d6SMark Brown cmin = 1; 755e79055d6SMark Brown cmax = INT_MAX; 756e79055d6SMark Brown constraints->min_uV = cmin; 757e79055d6SMark Brown constraints->max_uV = cmax; 758e79055d6SMark Brown } 759e79055d6SMark Brown 760e79055d6SMark Brown /* voltage constraints are optional */ 761e79055d6SMark Brown if ((cmin == 0) && (cmax == 0)) 762e79055d6SMark Brown return 0; 763e79055d6SMark Brown 764e79055d6SMark Brown /* else require explicit machine-level constraints */ 765e79055d6SMark Brown if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 766e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 767e79055d6SMark Brown __func__, "invalid", name); 768e79055d6SMark Brown return -EINVAL; 769e79055d6SMark Brown } 770e79055d6SMark Brown 771e79055d6SMark Brown /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 772e79055d6SMark Brown for (i = 0; i < count; i++) { 773e79055d6SMark Brown int value; 774e79055d6SMark Brown 775e79055d6SMark Brown value = ops->list_voltage(rdev, i); 776e79055d6SMark Brown if (value <= 0) 777e79055d6SMark Brown continue; 778e79055d6SMark Brown 779e79055d6SMark Brown /* maybe adjust [min_uV..max_uV] */ 780e79055d6SMark Brown if (value >= cmin && value < min_uV) 781e79055d6SMark Brown min_uV = value; 782e79055d6SMark Brown if (value <= cmax && value > max_uV) 783e79055d6SMark Brown max_uV = value; 784e79055d6SMark Brown } 785e79055d6SMark Brown 786e79055d6SMark Brown /* final: [min_uV..max_uV] valid iff constraints valid */ 787e79055d6SMark Brown if (max_uV < min_uV) { 788e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 789e79055d6SMark Brown __func__, "unsupportable", name); 790e79055d6SMark Brown return -EINVAL; 791e79055d6SMark Brown } 792e79055d6SMark Brown 793e79055d6SMark Brown /* use regulator's subset of machine constraints */ 794e79055d6SMark Brown if (constraints->min_uV < min_uV) { 795e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 796e79055d6SMark Brown __func__, name, "min_uV", 797e79055d6SMark Brown constraints->min_uV, min_uV); 798e79055d6SMark Brown constraints->min_uV = min_uV; 799e79055d6SMark Brown } 800e79055d6SMark Brown if (constraints->max_uV > max_uV) { 801e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 802e79055d6SMark Brown __func__, name, "max_uV", 803e79055d6SMark Brown constraints->max_uV, max_uV); 804e79055d6SMark Brown constraints->max_uV = max_uV; 805e79055d6SMark Brown } 806e79055d6SMark Brown } 807e79055d6SMark Brown 808e79055d6SMark Brown return 0; 809e79055d6SMark Brown } 810e79055d6SMark Brown 811a5766f11SLiam Girdwood /** 812a5766f11SLiam Girdwood * set_machine_constraints - sets regulator constraints 81369279fb9SMark Brown * @rdev: regulator source 814c8e7e464SMark Brown * @constraints: constraints to apply 815a5766f11SLiam Girdwood * 816a5766f11SLiam Girdwood * Allows platform initialisation code to define and constrain 817a5766f11SLiam Girdwood * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 818a5766f11SLiam Girdwood * Constraints *must* be set by platform code in order for some 819a5766f11SLiam Girdwood * regulator operations to proceed i.e. set_voltage, set_current_limit, 820a5766f11SLiam Girdwood * set_mode. 821a5766f11SLiam Girdwood */ 822a5766f11SLiam Girdwood static int set_machine_constraints(struct regulator_dev *rdev, 823a5766f11SLiam Girdwood struct regulation_constraints *constraints) 824a5766f11SLiam Girdwood { 825a5766f11SLiam Girdwood int ret = 0; 826e06f5b4fSMark Brown const char *name; 827e5fda26cSMark Brown struct regulator_ops *ops = rdev->desc->ops; 828e06f5b4fSMark Brown 829af5866c9SMark Brown rdev->constraints = constraints; 830af5866c9SMark Brown 8311083c393SMark Brown name = rdev_get_name(rdev); 8321083c393SMark Brown 8331083c393SMark Brown ret = machine_constraints_voltage(rdev, constraints); 834e79055d6SMark Brown if (ret != 0) 8353e2b9abdSMark Brown goto out; 8363e2b9abdSMark Brown 837a5766f11SLiam Girdwood /* do we need to setup our suspend state */ 838e06f5b4fSMark Brown if (constraints->initial_state) { 839a5766f11SLiam Girdwood ret = suspend_prepare(rdev, constraints->initial_state); 840e06f5b4fSMark Brown if (ret < 0) { 841e06f5b4fSMark Brown printk(KERN_ERR "%s: failed to set suspend state for %s\n", 842e06f5b4fSMark Brown __func__, name); 843e06f5b4fSMark Brown rdev->constraints = NULL; 844e06f5b4fSMark Brown goto out; 845e06f5b4fSMark Brown } 846e06f5b4fSMark Brown } 847a5766f11SLiam Girdwood 848a308466cSMark Brown if (constraints->initial_mode) { 849a308466cSMark Brown if (!ops->set_mode) { 850a308466cSMark Brown printk(KERN_ERR "%s: no set_mode operation for %s\n", 851a308466cSMark Brown __func__, name); 852a308466cSMark Brown ret = -EINVAL; 853a308466cSMark Brown goto out; 854a308466cSMark Brown } 855a308466cSMark Brown 856a308466cSMark Brown ret = ops->set_mode(rdev, constraints->initial_mode); 857a308466cSMark Brown if (ret < 0) { 858a308466cSMark Brown printk(KERN_ERR 859a308466cSMark Brown "%s: failed to set initial mode for %s: %d\n", 860a308466cSMark Brown __func__, name, ret); 861a308466cSMark Brown goto out; 862a308466cSMark Brown } 863a308466cSMark Brown } 864a308466cSMark Brown 865cacf90f2SMark Brown /* If the constraints say the regulator should be on at this point 866cacf90f2SMark Brown * and we have control then make sure it is enabled. 867cacf90f2SMark Brown */ 868cacf90f2SMark Brown if ((constraints->always_on || constraints->boot_on) && ops->enable) { 869e5fda26cSMark Brown ret = ops->enable(rdev); 870e5fda26cSMark Brown if (ret < 0) { 871e5fda26cSMark Brown printk(KERN_ERR "%s: failed to enable %s\n", 872e5fda26cSMark Brown __func__, name); 873e5fda26cSMark Brown rdev->constraints = NULL; 874e5fda26cSMark Brown goto out; 875e5fda26cSMark Brown } 876e5fda26cSMark Brown } 877e5fda26cSMark Brown 878a5766f11SLiam Girdwood print_constraints(rdev); 879a5766f11SLiam Girdwood out: 880a5766f11SLiam Girdwood return ret; 881a5766f11SLiam Girdwood } 882a5766f11SLiam Girdwood 883a5766f11SLiam Girdwood /** 884a5766f11SLiam Girdwood * set_supply - set regulator supply regulator 88569279fb9SMark Brown * @rdev: regulator name 88669279fb9SMark Brown * @supply_rdev: supply regulator name 887a5766f11SLiam Girdwood * 888a5766f11SLiam Girdwood * Called by platform initialisation code to set the supply regulator for this 889a5766f11SLiam Girdwood * regulator. This ensures that a regulators supply will also be enabled by the 890a5766f11SLiam Girdwood * core if it's child is enabled. 891a5766f11SLiam Girdwood */ 892a5766f11SLiam Girdwood static int set_supply(struct regulator_dev *rdev, 893a5766f11SLiam Girdwood struct regulator_dev *supply_rdev) 894a5766f11SLiam Girdwood { 895a5766f11SLiam Girdwood int err; 896a5766f11SLiam Girdwood 897a5766f11SLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 898a5766f11SLiam Girdwood "supply"); 899a5766f11SLiam Girdwood if (err) { 900a5766f11SLiam Girdwood printk(KERN_ERR 901a5766f11SLiam Girdwood "%s: could not add device link %s err %d\n", 902a5766f11SLiam Girdwood __func__, supply_rdev->dev.kobj.name, err); 903a5766f11SLiam Girdwood goto out; 904a5766f11SLiam Girdwood } 905a5766f11SLiam Girdwood rdev->supply = supply_rdev; 906a5766f11SLiam Girdwood list_add(&rdev->slist, &supply_rdev->supply_list); 907a5766f11SLiam Girdwood out: 908a5766f11SLiam Girdwood return err; 909a5766f11SLiam Girdwood } 910a5766f11SLiam Girdwood 911a5766f11SLiam Girdwood /** 912a5766f11SLiam Girdwood * set_consumer_device_supply: Bind a regulator to a symbolic supply 91369279fb9SMark Brown * @rdev: regulator source 91469279fb9SMark Brown * @consumer_dev: device the supply applies to 91540f9244fSMark Brown * @consumer_dev_name: dev_name() string for device supply applies to 916a5766f11SLiam Girdwood * @supply: symbolic name for supply 917a5766f11SLiam Girdwood * 918a5766f11SLiam Girdwood * Allows platform initialisation code to map physical regulator 919a5766f11SLiam Girdwood * sources to symbolic names for supplies for use by devices. Devices 920a5766f11SLiam Girdwood * should use these symbolic names to request regulators, avoiding the 921a5766f11SLiam Girdwood * need to provide board-specific regulator names as platform data. 92240f9244fSMark Brown * 92340f9244fSMark Brown * Only one of consumer_dev and consumer_dev_name may be specified. 924a5766f11SLiam Girdwood */ 925a5766f11SLiam Girdwood static int set_consumer_device_supply(struct regulator_dev *rdev, 92640f9244fSMark Brown struct device *consumer_dev, const char *consumer_dev_name, 92740f9244fSMark Brown const char *supply) 928a5766f11SLiam Girdwood { 929a5766f11SLiam Girdwood struct regulator_map *node; 9309ed2099eSMark Brown int has_dev; 931a5766f11SLiam Girdwood 93240f9244fSMark Brown if (consumer_dev && consumer_dev_name) 93340f9244fSMark Brown return -EINVAL; 93440f9244fSMark Brown 93540f9244fSMark Brown if (!consumer_dev_name && consumer_dev) 93640f9244fSMark Brown consumer_dev_name = dev_name(consumer_dev); 93740f9244fSMark Brown 938a5766f11SLiam Girdwood if (supply == NULL) 939a5766f11SLiam Girdwood return -EINVAL; 940a5766f11SLiam Girdwood 9419ed2099eSMark Brown if (consumer_dev_name != NULL) 9429ed2099eSMark Brown has_dev = 1; 9439ed2099eSMark Brown else 9449ed2099eSMark Brown has_dev = 0; 9459ed2099eSMark Brown 9466001e13cSDavid Brownell list_for_each_entry(node, ®ulator_map_list, list) { 94723b5cc2aSJani Nikula if (node->dev_name && consumer_dev_name) { 94823b5cc2aSJani Nikula if (strcmp(node->dev_name, consumer_dev_name) != 0) 9496001e13cSDavid Brownell continue; 95023b5cc2aSJani Nikula } else if (node->dev_name || consumer_dev_name) { 95123b5cc2aSJani Nikula continue; 95223b5cc2aSJani Nikula } 95323b5cc2aSJani Nikula 9546001e13cSDavid Brownell if (strcmp(node->supply, supply) != 0) 9556001e13cSDavid Brownell continue; 9566001e13cSDavid Brownell 9576001e13cSDavid Brownell dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 9586001e13cSDavid Brownell dev_name(&node->regulator->dev), 9596001e13cSDavid Brownell node->regulator->desc->name, 9606001e13cSDavid Brownell supply, 9611083c393SMark Brown dev_name(&rdev->dev), rdev_get_name(rdev)); 9626001e13cSDavid Brownell return -EBUSY; 9636001e13cSDavid Brownell } 9646001e13cSDavid Brownell 9659ed2099eSMark Brown node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 966a5766f11SLiam Girdwood if (node == NULL) 967a5766f11SLiam Girdwood return -ENOMEM; 968a5766f11SLiam Girdwood 969a5766f11SLiam Girdwood node->regulator = rdev; 970a5766f11SLiam Girdwood node->supply = supply; 971a5766f11SLiam Girdwood 9729ed2099eSMark Brown if (has_dev) { 9739ed2099eSMark Brown node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 97440f9244fSMark Brown if (node->dev_name == NULL) { 97540f9244fSMark Brown kfree(node); 97640f9244fSMark Brown return -ENOMEM; 97740f9244fSMark Brown } 9789ed2099eSMark Brown } 97940f9244fSMark Brown 980a5766f11SLiam Girdwood list_add(&node->list, ®ulator_map_list); 981a5766f11SLiam Girdwood return 0; 982a5766f11SLiam Girdwood } 983a5766f11SLiam Girdwood 9840f1d747bSMike Rapoport static void unset_regulator_supplies(struct regulator_dev *rdev) 9850f1d747bSMike Rapoport { 9860f1d747bSMike Rapoport struct regulator_map *node, *n; 9870f1d747bSMike Rapoport 9880f1d747bSMike Rapoport list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 9890f1d747bSMike Rapoport if (rdev == node->regulator) { 9900f1d747bSMike Rapoport list_del(&node->list); 99140f9244fSMark Brown kfree(node->dev_name); 9920f1d747bSMike Rapoport kfree(node); 9930f1d747bSMike Rapoport } 9940f1d747bSMike Rapoport } 9950f1d747bSMike Rapoport } 9960f1d747bSMike Rapoport 997414c70cbSLiam Girdwood #define REG_STR_SIZE 32 998414c70cbSLiam Girdwood 999414c70cbSLiam Girdwood static struct regulator *create_regulator(struct regulator_dev *rdev, 1000414c70cbSLiam Girdwood struct device *dev, 1001414c70cbSLiam Girdwood const char *supply_name) 1002414c70cbSLiam Girdwood { 1003414c70cbSLiam Girdwood struct regulator *regulator; 1004414c70cbSLiam Girdwood char buf[REG_STR_SIZE]; 1005414c70cbSLiam Girdwood int err, size; 1006414c70cbSLiam Girdwood 1007414c70cbSLiam Girdwood regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1008414c70cbSLiam Girdwood if (regulator == NULL) 1009414c70cbSLiam Girdwood return NULL; 1010414c70cbSLiam Girdwood 1011414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1012414c70cbSLiam Girdwood regulator->rdev = rdev; 1013414c70cbSLiam Girdwood list_add(®ulator->list, &rdev->consumer_list); 1014414c70cbSLiam Girdwood 1015414c70cbSLiam Girdwood if (dev) { 1016414c70cbSLiam Girdwood /* create a 'requested_microamps_name' sysfs entry */ 1017414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1018414c70cbSLiam Girdwood supply_name); 1019414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1020414c70cbSLiam Girdwood goto overflow_err; 1021414c70cbSLiam Girdwood 1022414c70cbSLiam Girdwood regulator->dev = dev; 10234f26a2abSAmeya Palande sysfs_attr_init(®ulator->dev_attr.attr); 1024414c70cbSLiam Girdwood regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1025414c70cbSLiam Girdwood if (regulator->dev_attr.attr.name == NULL) 1026414c70cbSLiam Girdwood goto attr_name_err; 1027414c70cbSLiam Girdwood 1028414c70cbSLiam Girdwood regulator->dev_attr.attr.mode = 0444; 1029414c70cbSLiam Girdwood regulator->dev_attr.show = device_requested_uA_show; 1030414c70cbSLiam Girdwood err = device_create_file(dev, ®ulator->dev_attr); 1031414c70cbSLiam Girdwood if (err < 0) { 1032414c70cbSLiam Girdwood printk(KERN_WARNING "%s: could not add regulator_dev" 1033414c70cbSLiam Girdwood " load sysfs\n", __func__); 1034414c70cbSLiam Girdwood goto attr_name_err; 1035414c70cbSLiam Girdwood } 1036414c70cbSLiam Girdwood 1037414c70cbSLiam Girdwood /* also add a link to the device sysfs entry */ 1038414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1039414c70cbSLiam Girdwood dev->kobj.name, supply_name); 1040414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1041414c70cbSLiam Girdwood goto attr_err; 1042414c70cbSLiam Girdwood 1043414c70cbSLiam Girdwood regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1044414c70cbSLiam Girdwood if (regulator->supply_name == NULL) 1045414c70cbSLiam Girdwood goto attr_err; 1046414c70cbSLiam Girdwood 1047414c70cbSLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1048414c70cbSLiam Girdwood buf); 1049414c70cbSLiam Girdwood if (err) { 1050414c70cbSLiam Girdwood printk(KERN_WARNING 1051414c70cbSLiam Girdwood "%s: could not add device link %s err %d\n", 1052414c70cbSLiam Girdwood __func__, dev->kobj.name, err); 1053414c70cbSLiam Girdwood device_remove_file(dev, ®ulator->dev_attr); 1054414c70cbSLiam Girdwood goto link_name_err; 1055414c70cbSLiam Girdwood } 1056414c70cbSLiam Girdwood } 1057414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1058414c70cbSLiam Girdwood return regulator; 1059414c70cbSLiam Girdwood link_name_err: 1060414c70cbSLiam Girdwood kfree(regulator->supply_name); 1061414c70cbSLiam Girdwood attr_err: 1062414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1063414c70cbSLiam Girdwood attr_name_err: 1064414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1065414c70cbSLiam Girdwood overflow_err: 1066414c70cbSLiam Girdwood list_del(®ulator->list); 1067414c70cbSLiam Girdwood kfree(regulator); 1068414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1069414c70cbSLiam Girdwood return NULL; 1070414c70cbSLiam Girdwood } 1071414c70cbSLiam Girdwood 107231aae2beSMark Brown static int _regulator_get_enable_time(struct regulator_dev *rdev) 107331aae2beSMark Brown { 107431aae2beSMark Brown if (!rdev->desc->ops->enable_time) 107531aae2beSMark Brown return 0; 107631aae2beSMark Brown return rdev->desc->ops->enable_time(rdev); 107731aae2beSMark Brown } 107831aae2beSMark Brown 10795ffbd136SMark Brown /* Internal regulator request function */ 10805ffbd136SMark Brown static struct regulator *_regulator_get(struct device *dev, const char *id, 10815ffbd136SMark Brown int exclusive) 1082414c70cbSLiam Girdwood { 1083414c70cbSLiam Girdwood struct regulator_dev *rdev; 1084414c70cbSLiam Girdwood struct regulator_map *map; 1085414c70cbSLiam Girdwood struct regulator *regulator = ERR_PTR(-ENODEV); 108640f9244fSMark Brown const char *devname = NULL; 10875ffbd136SMark Brown int ret; 1088414c70cbSLiam Girdwood 1089414c70cbSLiam Girdwood if (id == NULL) { 1090414c70cbSLiam Girdwood printk(KERN_ERR "regulator: get() with no identifier\n"); 1091414c70cbSLiam Girdwood return regulator; 1092414c70cbSLiam Girdwood } 1093414c70cbSLiam Girdwood 109440f9244fSMark Brown if (dev) 109540f9244fSMark Brown devname = dev_name(dev); 109640f9244fSMark Brown 1097414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1098414c70cbSLiam Girdwood 1099414c70cbSLiam Girdwood list_for_each_entry(map, ®ulator_map_list, list) { 110040f9244fSMark Brown /* If the mapping has a device set up it must match */ 110140f9244fSMark Brown if (map->dev_name && 110240f9244fSMark Brown (!devname || strcmp(map->dev_name, devname))) 110340f9244fSMark Brown continue; 110440f9244fSMark Brown 110540f9244fSMark Brown if (strcmp(map->supply, id) == 0) { 1106a5766f11SLiam Girdwood rdev = map->regulator; 1107414c70cbSLiam Girdwood goto found; 1108414c70cbSLiam Girdwood } 1109a5766f11SLiam Girdwood } 111034abbd68SMark Brown 111134abbd68SMark Brown #ifdef CONFIG_REGULATOR_DUMMY 111234abbd68SMark Brown if (!devname) 111334abbd68SMark Brown devname = "deviceless"; 111434abbd68SMark Brown 111534abbd68SMark Brown /* If the board didn't flag that it was fully constrained then 111634abbd68SMark Brown * substitute in a dummy regulator so consumers can continue. 111734abbd68SMark Brown */ 111834abbd68SMark Brown if (!has_full_constraints) { 111934abbd68SMark Brown pr_warning("%s supply %s not found, using dummy regulator\n", 112034abbd68SMark Brown devname, id); 112134abbd68SMark Brown rdev = dummy_regulator_rdev; 112234abbd68SMark Brown goto found; 112334abbd68SMark Brown } 112434abbd68SMark Brown #endif 112534abbd68SMark Brown 1126414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1127414c70cbSLiam Girdwood return regulator; 1128414c70cbSLiam Girdwood 1129414c70cbSLiam Girdwood found: 11305ffbd136SMark Brown if (rdev->exclusive) { 11315ffbd136SMark Brown regulator = ERR_PTR(-EPERM); 11325ffbd136SMark Brown goto out; 11335ffbd136SMark Brown } 11345ffbd136SMark Brown 11355ffbd136SMark Brown if (exclusive && rdev->open_count) { 11365ffbd136SMark Brown regulator = ERR_PTR(-EBUSY); 11375ffbd136SMark Brown goto out; 11385ffbd136SMark Brown } 11395ffbd136SMark Brown 1140a5766f11SLiam Girdwood if (!try_module_get(rdev->owner)) 1141a5766f11SLiam Girdwood goto out; 1142a5766f11SLiam Girdwood 1143414c70cbSLiam Girdwood regulator = create_regulator(rdev, dev, id); 1144414c70cbSLiam Girdwood if (regulator == NULL) { 1145414c70cbSLiam Girdwood regulator = ERR_PTR(-ENOMEM); 1146414c70cbSLiam Girdwood module_put(rdev->owner); 1147414c70cbSLiam Girdwood } 1148414c70cbSLiam Girdwood 11495ffbd136SMark Brown rdev->open_count++; 11505ffbd136SMark Brown if (exclusive) { 11515ffbd136SMark Brown rdev->exclusive = 1; 11525ffbd136SMark Brown 11535ffbd136SMark Brown ret = _regulator_is_enabled(rdev); 11545ffbd136SMark Brown if (ret > 0) 11555ffbd136SMark Brown rdev->use_count = 1; 11565ffbd136SMark Brown else 11575ffbd136SMark Brown rdev->use_count = 0; 11585ffbd136SMark Brown } 11595ffbd136SMark Brown 1160a5766f11SLiam Girdwood out: 1161414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 11625ffbd136SMark Brown 1163414c70cbSLiam Girdwood return regulator; 1164414c70cbSLiam Girdwood } 11655ffbd136SMark Brown 11665ffbd136SMark Brown /** 11675ffbd136SMark Brown * regulator_get - lookup and obtain a reference to a regulator. 11685ffbd136SMark Brown * @dev: device for regulator "consumer" 11695ffbd136SMark Brown * @id: Supply name or regulator ID. 11705ffbd136SMark Brown * 11715ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 11725ffbd136SMark Brown * or IS_ERR() condition containing errno. 11735ffbd136SMark Brown * 11745ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 11755ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 11765ffbd136SMark Brown * should match the name used for the supply and/or the relevant 11775ffbd136SMark Brown * device pins in the datasheet. 11785ffbd136SMark Brown */ 11795ffbd136SMark Brown struct regulator *regulator_get(struct device *dev, const char *id) 11805ffbd136SMark Brown { 11815ffbd136SMark Brown return _regulator_get(dev, id, 0); 11825ffbd136SMark Brown } 1183414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get); 1184414c70cbSLiam Girdwood 1185414c70cbSLiam Girdwood /** 11865ffbd136SMark Brown * regulator_get_exclusive - obtain exclusive access to a regulator. 11875ffbd136SMark Brown * @dev: device for regulator "consumer" 11885ffbd136SMark Brown * @id: Supply name or regulator ID. 11895ffbd136SMark Brown * 11905ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 11915ffbd136SMark Brown * or IS_ERR() condition containing errno. Other consumers will be 11925ffbd136SMark Brown * unable to obtain this reference is held and the use count for the 11935ffbd136SMark Brown * regulator will be initialised to reflect the current state of the 11945ffbd136SMark Brown * regulator. 11955ffbd136SMark Brown * 11965ffbd136SMark Brown * This is intended for use by consumers which cannot tolerate shared 11975ffbd136SMark Brown * use of the regulator such as those which need to force the 11985ffbd136SMark Brown * regulator off for correct operation of the hardware they are 11995ffbd136SMark Brown * controlling. 12005ffbd136SMark Brown * 12015ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 12025ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 12035ffbd136SMark Brown * should match the name used for the supply and/or the relevant 12045ffbd136SMark Brown * device pins in the datasheet. 12055ffbd136SMark Brown */ 12065ffbd136SMark Brown struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 12075ffbd136SMark Brown { 12085ffbd136SMark Brown return _regulator_get(dev, id, 1); 12095ffbd136SMark Brown } 12105ffbd136SMark Brown EXPORT_SYMBOL_GPL(regulator_get_exclusive); 12115ffbd136SMark Brown 12125ffbd136SMark Brown /** 1213414c70cbSLiam Girdwood * regulator_put - "free" the regulator source 1214414c70cbSLiam Girdwood * @regulator: regulator source 1215414c70cbSLiam Girdwood * 1216414c70cbSLiam Girdwood * Note: drivers must ensure that all regulator_enable calls made on this 1217414c70cbSLiam Girdwood * regulator source are balanced by regulator_disable calls prior to calling 1218414c70cbSLiam Girdwood * this function. 1219414c70cbSLiam Girdwood */ 1220414c70cbSLiam Girdwood void regulator_put(struct regulator *regulator) 1221414c70cbSLiam Girdwood { 1222414c70cbSLiam Girdwood struct regulator_dev *rdev; 1223414c70cbSLiam Girdwood 1224414c70cbSLiam Girdwood if (regulator == NULL || IS_ERR(regulator)) 1225414c70cbSLiam Girdwood return; 1226414c70cbSLiam Girdwood 1227414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1228414c70cbSLiam Girdwood rdev = regulator->rdev; 1229414c70cbSLiam Girdwood 1230414c70cbSLiam Girdwood /* remove any sysfs entries */ 1231414c70cbSLiam Girdwood if (regulator->dev) { 1232414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1233414c70cbSLiam Girdwood kfree(regulator->supply_name); 1234414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1235414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1236414c70cbSLiam Girdwood } 1237414c70cbSLiam Girdwood list_del(®ulator->list); 1238414c70cbSLiam Girdwood kfree(regulator); 1239414c70cbSLiam Girdwood 12405ffbd136SMark Brown rdev->open_count--; 12415ffbd136SMark Brown rdev->exclusive = 0; 12425ffbd136SMark Brown 1243414c70cbSLiam Girdwood module_put(rdev->owner); 1244414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1245414c70cbSLiam Girdwood } 1246414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_put); 1247414c70cbSLiam Girdwood 12489a2372faSMark Brown static int _regulator_can_change_status(struct regulator_dev *rdev) 12499a2372faSMark Brown { 12509a2372faSMark Brown if (!rdev->constraints) 12519a2372faSMark Brown return 0; 12529a2372faSMark Brown 12539a2372faSMark Brown if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 12549a2372faSMark Brown return 1; 12559a2372faSMark Brown else 12569a2372faSMark Brown return 0; 12579a2372faSMark Brown } 12589a2372faSMark Brown 1259414c70cbSLiam Girdwood /* locks held by regulator_enable() */ 1260414c70cbSLiam Girdwood static int _regulator_enable(struct regulator_dev *rdev) 1261414c70cbSLiam Girdwood { 126231aae2beSMark Brown int ret, delay; 1263414c70cbSLiam Girdwood 1264414c70cbSLiam Girdwood /* do we need to enable the supply regulator first */ 1265414c70cbSLiam Girdwood if (rdev->supply) { 1266414c70cbSLiam Girdwood ret = _regulator_enable(rdev->supply); 1267414c70cbSLiam Girdwood if (ret < 0) { 1268414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enable %s: %d\n", 12691083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1270414c70cbSLiam Girdwood return ret; 1271414c70cbSLiam Girdwood } 1272414c70cbSLiam Girdwood } 1273414c70cbSLiam Girdwood 1274414c70cbSLiam Girdwood /* check voltage and requested load before enabling */ 1275414c70cbSLiam Girdwood if (rdev->constraints && 12769a2372faSMark Brown (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1277414c70cbSLiam Girdwood drms_uA_update(rdev); 1278414c70cbSLiam Girdwood 12799a2372faSMark Brown if (rdev->use_count == 0) { 12809a2372faSMark Brown /* The regulator may on if it's not switchable or left on */ 12819a2372faSMark Brown ret = _regulator_is_enabled(rdev); 12829a2372faSMark Brown if (ret == -EINVAL || ret == 0) { 12839a2372faSMark Brown if (!_regulator_can_change_status(rdev)) 12849a2372faSMark Brown return -EPERM; 12859a2372faSMark Brown 128631aae2beSMark Brown if (!rdev->desc->ops->enable) 128731aae2beSMark Brown return -EINVAL; 128831aae2beSMark Brown 128931aae2beSMark Brown /* Query before enabling in case configuration 129031aae2beSMark Brown * dependant. */ 129131aae2beSMark Brown ret = _regulator_get_enable_time(rdev); 129231aae2beSMark Brown if (ret >= 0) { 129331aae2beSMark Brown delay = ret; 129431aae2beSMark Brown } else { 129531aae2beSMark Brown printk(KERN_WARNING 129631aae2beSMark Brown "%s: enable_time() failed for %s: %d\n", 129731aae2beSMark Brown __func__, rdev_get_name(rdev), 129831aae2beSMark Brown ret); 129931aae2beSMark Brown delay = 0; 130031aae2beSMark Brown } 130131aae2beSMark Brown 130231aae2beSMark Brown /* Allow the regulator to ramp; it would be useful 130331aae2beSMark Brown * to extend this for bulk operations so that the 130431aae2beSMark Brown * regulators can ramp together. */ 1305414c70cbSLiam Girdwood ret = rdev->desc->ops->enable(rdev); 13069a2372faSMark Brown if (ret < 0) 13079a2372faSMark Brown return ret; 130831aae2beSMark Brown 130931aae2beSMark Brown if (delay >= 1000) 131031aae2beSMark Brown mdelay(delay / 1000); 131131aae2beSMark Brown else if (delay) 131231aae2beSMark Brown udelay(delay); 131331aae2beSMark Brown 1314a7433cffSLinus Walleij } else if (ret < 0) { 13159a2372faSMark Brown printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", 13161083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1317414c70cbSLiam Girdwood return ret; 1318414c70cbSLiam Girdwood } 1319a7433cffSLinus Walleij /* Fallthrough on positive return values - already enabled */ 1320414c70cbSLiam Girdwood } 1321414c70cbSLiam Girdwood 13229a2372faSMark Brown rdev->use_count++; 13239a2372faSMark Brown 13249a2372faSMark Brown return 0; 1325414c70cbSLiam Girdwood } 1326414c70cbSLiam Girdwood 1327414c70cbSLiam Girdwood /** 1328414c70cbSLiam Girdwood * regulator_enable - enable regulator output 1329414c70cbSLiam Girdwood * @regulator: regulator source 1330414c70cbSLiam Girdwood * 1331cf7bbcdfSMark Brown * Request that the regulator be enabled with the regulator output at 1332cf7bbcdfSMark Brown * the predefined voltage or current value. Calls to regulator_enable() 1333cf7bbcdfSMark Brown * must be balanced with calls to regulator_disable(). 1334cf7bbcdfSMark Brown * 1335414c70cbSLiam Girdwood * NOTE: the output value can be set by other drivers, boot loader or may be 1336cf7bbcdfSMark Brown * hardwired in the regulator. 1337414c70cbSLiam Girdwood */ 1338414c70cbSLiam Girdwood int regulator_enable(struct regulator *regulator) 1339414c70cbSLiam Girdwood { 1340412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1341412aec61SDavid Brownell int ret = 0; 1342414c70cbSLiam Girdwood 1343412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1344412aec61SDavid Brownell ret = _regulator_enable(rdev); 1345412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 1346414c70cbSLiam Girdwood return ret; 1347414c70cbSLiam Girdwood } 1348414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_enable); 1349414c70cbSLiam Girdwood 1350414c70cbSLiam Girdwood /* locks held by regulator_disable() */ 1351414c70cbSLiam Girdwood static int _regulator_disable(struct regulator_dev *rdev) 1352414c70cbSLiam Girdwood { 1353414c70cbSLiam Girdwood int ret = 0; 1354414c70cbSLiam Girdwood 1355cd94b505SDavid Brownell if (WARN(rdev->use_count <= 0, 1356cd94b505SDavid Brownell "unbalanced disables for %s\n", 13571083c393SMark Brown rdev_get_name(rdev))) 1358cd94b505SDavid Brownell return -EIO; 1359cd94b505SDavid Brownell 1360414c70cbSLiam Girdwood /* are we the last user and permitted to disable ? */ 136160ef66fcSMark Brown if (rdev->use_count == 1 && 136260ef66fcSMark Brown (rdev->constraints && !rdev->constraints->always_on)) { 1363414c70cbSLiam Girdwood 1364414c70cbSLiam Girdwood /* we are last user */ 13659a2372faSMark Brown if (_regulator_can_change_status(rdev) && 13669a2372faSMark Brown rdev->desc->ops->disable) { 1367414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1368414c70cbSLiam Girdwood if (ret < 0) { 1369414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to disable %s\n", 13701083c393SMark Brown __func__, rdev_get_name(rdev)); 1371414c70cbSLiam Girdwood return ret; 1372414c70cbSLiam Girdwood } 137384b68263SMark Brown 137484b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 137584b68263SMark Brown NULL); 1376414c70cbSLiam Girdwood } 1377414c70cbSLiam Girdwood 1378414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 1379414c70cbSLiam Girdwood if (rdev->supply) 1380414c70cbSLiam Girdwood _regulator_disable(rdev->supply); 1381414c70cbSLiam Girdwood 1382414c70cbSLiam Girdwood rdev->use_count = 0; 1383414c70cbSLiam Girdwood } else if (rdev->use_count > 1) { 1384414c70cbSLiam Girdwood 1385414c70cbSLiam Girdwood if (rdev->constraints && 1386414c70cbSLiam Girdwood (rdev->constraints->valid_ops_mask & 1387414c70cbSLiam Girdwood REGULATOR_CHANGE_DRMS)) 1388414c70cbSLiam Girdwood drms_uA_update(rdev); 1389414c70cbSLiam Girdwood 1390414c70cbSLiam Girdwood rdev->use_count--; 1391414c70cbSLiam Girdwood } 1392414c70cbSLiam Girdwood return ret; 1393414c70cbSLiam Girdwood } 1394414c70cbSLiam Girdwood 1395414c70cbSLiam Girdwood /** 1396414c70cbSLiam Girdwood * regulator_disable - disable regulator output 1397414c70cbSLiam Girdwood * @regulator: regulator source 1398414c70cbSLiam Girdwood * 1399cf7bbcdfSMark Brown * Disable the regulator output voltage or current. Calls to 1400cf7bbcdfSMark Brown * regulator_enable() must be balanced with calls to 1401cf7bbcdfSMark Brown * regulator_disable(). 140269279fb9SMark Brown * 1403414c70cbSLiam Girdwood * NOTE: this will only disable the regulator output if no other consumer 1404cf7bbcdfSMark Brown * devices have it enabled, the regulator device supports disabling and 1405cf7bbcdfSMark Brown * machine constraints permit this operation. 1406414c70cbSLiam Girdwood */ 1407414c70cbSLiam Girdwood int regulator_disable(struct regulator *regulator) 1408414c70cbSLiam Girdwood { 1409412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1410412aec61SDavid Brownell int ret = 0; 1411414c70cbSLiam Girdwood 1412412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1413412aec61SDavid Brownell ret = _regulator_disable(rdev); 1414412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 1415414c70cbSLiam Girdwood return ret; 1416414c70cbSLiam Girdwood } 1417414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_disable); 1418414c70cbSLiam Girdwood 1419414c70cbSLiam Girdwood /* locks held by regulator_force_disable() */ 1420414c70cbSLiam Girdwood static int _regulator_force_disable(struct regulator_dev *rdev) 1421414c70cbSLiam Girdwood { 1422414c70cbSLiam Girdwood int ret = 0; 1423414c70cbSLiam Girdwood 1424414c70cbSLiam Girdwood /* force disable */ 1425414c70cbSLiam Girdwood if (rdev->desc->ops->disable) { 1426414c70cbSLiam Girdwood /* ah well, who wants to live forever... */ 1427414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1428414c70cbSLiam Girdwood if (ret < 0) { 1429414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to force disable %s\n", 14301083c393SMark Brown __func__, rdev_get_name(rdev)); 1431414c70cbSLiam Girdwood return ret; 1432414c70cbSLiam Girdwood } 1433414c70cbSLiam Girdwood /* notify other consumers that power has been forced off */ 143484b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 143584b68263SMark Brown REGULATOR_EVENT_DISABLE, NULL); 1436414c70cbSLiam Girdwood } 1437414c70cbSLiam Girdwood 1438414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 1439414c70cbSLiam Girdwood if (rdev->supply) 1440414c70cbSLiam Girdwood _regulator_disable(rdev->supply); 1441414c70cbSLiam Girdwood 1442414c70cbSLiam Girdwood rdev->use_count = 0; 1443414c70cbSLiam Girdwood return ret; 1444414c70cbSLiam Girdwood } 1445414c70cbSLiam Girdwood 1446414c70cbSLiam Girdwood /** 1447414c70cbSLiam Girdwood * regulator_force_disable - force disable regulator output 1448414c70cbSLiam Girdwood * @regulator: regulator source 1449414c70cbSLiam Girdwood * 1450414c70cbSLiam Girdwood * Forcibly disable the regulator output voltage or current. 1451414c70cbSLiam Girdwood * NOTE: this *will* disable the regulator output even if other consumer 1452414c70cbSLiam Girdwood * devices have it enabled. This should be used for situations when device 1453414c70cbSLiam Girdwood * damage will likely occur if the regulator is not disabled (e.g. over temp). 1454414c70cbSLiam Girdwood */ 1455414c70cbSLiam Girdwood int regulator_force_disable(struct regulator *regulator) 1456414c70cbSLiam Girdwood { 1457414c70cbSLiam Girdwood int ret; 1458414c70cbSLiam Girdwood 1459414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1460414c70cbSLiam Girdwood regulator->uA_load = 0; 1461414c70cbSLiam Girdwood ret = _regulator_force_disable(regulator->rdev); 1462414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 1463414c70cbSLiam Girdwood return ret; 1464414c70cbSLiam Girdwood } 1465414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_force_disable); 1466414c70cbSLiam Girdwood 1467414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev) 1468414c70cbSLiam Girdwood { 14699a7f6a4cSMark Brown /* If we don't know then assume that the regulator is always on */ 14709332546fSMark Brown if (!rdev->desc->ops->is_enabled) 14719a7f6a4cSMark Brown return 1; 1472414c70cbSLiam Girdwood 14739332546fSMark Brown return rdev->desc->ops->is_enabled(rdev); 1474414c70cbSLiam Girdwood } 1475414c70cbSLiam Girdwood 1476414c70cbSLiam Girdwood /** 1477414c70cbSLiam Girdwood * regulator_is_enabled - is the regulator output enabled 1478414c70cbSLiam Girdwood * @regulator: regulator source 1479414c70cbSLiam Girdwood * 1480412aec61SDavid Brownell * Returns positive if the regulator driver backing the source/client 1481412aec61SDavid Brownell * has requested that the device be enabled, zero if it hasn't, else a 1482412aec61SDavid Brownell * negative errno code. 1483412aec61SDavid Brownell * 1484412aec61SDavid Brownell * Note that the device backing this regulator handle can have multiple 1485412aec61SDavid Brownell * users, so it might be enabled even if regulator_enable() was never 1486412aec61SDavid Brownell * called for this particular source. 1487414c70cbSLiam Girdwood */ 1488414c70cbSLiam Girdwood int regulator_is_enabled(struct regulator *regulator) 1489414c70cbSLiam Girdwood { 14909332546fSMark Brown int ret; 14919332546fSMark Brown 14929332546fSMark Brown mutex_lock(®ulator->rdev->mutex); 14939332546fSMark Brown ret = _regulator_is_enabled(regulator->rdev); 14949332546fSMark Brown mutex_unlock(®ulator->rdev->mutex); 14959332546fSMark Brown 14969332546fSMark Brown return ret; 1497414c70cbSLiam Girdwood } 1498414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_is_enabled); 1499414c70cbSLiam Girdwood 1500414c70cbSLiam Girdwood /** 15014367cfdcSDavid Brownell * regulator_count_voltages - count regulator_list_voltage() selectors 15024367cfdcSDavid Brownell * @regulator: regulator source 15034367cfdcSDavid Brownell * 15044367cfdcSDavid Brownell * Returns number of selectors, or negative errno. Selectors are 15054367cfdcSDavid Brownell * numbered starting at zero, and typically correspond to bitfields 15064367cfdcSDavid Brownell * in hardware registers. 15074367cfdcSDavid Brownell */ 15084367cfdcSDavid Brownell int regulator_count_voltages(struct regulator *regulator) 15094367cfdcSDavid Brownell { 15104367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15114367cfdcSDavid Brownell 15124367cfdcSDavid Brownell return rdev->desc->n_voltages ? : -EINVAL; 15134367cfdcSDavid Brownell } 15144367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_count_voltages); 15154367cfdcSDavid Brownell 15164367cfdcSDavid Brownell /** 15174367cfdcSDavid Brownell * regulator_list_voltage - enumerate supported voltages 15184367cfdcSDavid Brownell * @regulator: regulator source 15194367cfdcSDavid Brownell * @selector: identify voltage to list 15204367cfdcSDavid Brownell * Context: can sleep 15214367cfdcSDavid Brownell * 15224367cfdcSDavid Brownell * Returns a voltage that can be passed to @regulator_set_voltage(), 152388393161SThomas Weber * zero if this selector code can't be used on this system, or a 15244367cfdcSDavid Brownell * negative errno. 15254367cfdcSDavid Brownell */ 15264367cfdcSDavid Brownell int regulator_list_voltage(struct regulator *regulator, unsigned selector) 15274367cfdcSDavid Brownell { 15284367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15294367cfdcSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 15304367cfdcSDavid Brownell int ret; 15314367cfdcSDavid Brownell 15324367cfdcSDavid Brownell if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 15334367cfdcSDavid Brownell return -EINVAL; 15344367cfdcSDavid Brownell 15354367cfdcSDavid Brownell mutex_lock(&rdev->mutex); 15364367cfdcSDavid Brownell ret = ops->list_voltage(rdev, selector); 15374367cfdcSDavid Brownell mutex_unlock(&rdev->mutex); 15384367cfdcSDavid Brownell 15394367cfdcSDavid Brownell if (ret > 0) { 15404367cfdcSDavid Brownell if (ret < rdev->constraints->min_uV) 15414367cfdcSDavid Brownell ret = 0; 15424367cfdcSDavid Brownell else if (ret > rdev->constraints->max_uV) 15434367cfdcSDavid Brownell ret = 0; 15444367cfdcSDavid Brownell } 15454367cfdcSDavid Brownell 15464367cfdcSDavid Brownell return ret; 15474367cfdcSDavid Brownell } 15484367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_list_voltage); 15494367cfdcSDavid Brownell 15504367cfdcSDavid Brownell /** 1551a7a1ad90SMark Brown * regulator_is_supported_voltage - check if a voltage range can be supported 1552a7a1ad90SMark Brown * 1553a7a1ad90SMark Brown * @regulator: Regulator to check. 1554a7a1ad90SMark Brown * @min_uV: Minimum required voltage in uV. 1555a7a1ad90SMark Brown * @max_uV: Maximum required voltage in uV. 1556a7a1ad90SMark Brown * 1557a7a1ad90SMark Brown * Returns a boolean or a negative error code. 1558a7a1ad90SMark Brown */ 1559a7a1ad90SMark Brown int regulator_is_supported_voltage(struct regulator *regulator, 1560a7a1ad90SMark Brown int min_uV, int max_uV) 1561a7a1ad90SMark Brown { 1562a7a1ad90SMark Brown int i, voltages, ret; 1563a7a1ad90SMark Brown 1564a7a1ad90SMark Brown ret = regulator_count_voltages(regulator); 1565a7a1ad90SMark Brown if (ret < 0) 1566a7a1ad90SMark Brown return ret; 1567a7a1ad90SMark Brown voltages = ret; 1568a7a1ad90SMark Brown 1569a7a1ad90SMark Brown for (i = 0; i < voltages; i++) { 1570a7a1ad90SMark Brown ret = regulator_list_voltage(regulator, i); 1571a7a1ad90SMark Brown 1572a7a1ad90SMark Brown if (ret >= min_uV && ret <= max_uV) 1573a7a1ad90SMark Brown return 1; 1574a7a1ad90SMark Brown } 1575a7a1ad90SMark Brown 1576a7a1ad90SMark Brown return 0; 1577a7a1ad90SMark Brown } 1578a7a1ad90SMark Brown 1579a7a1ad90SMark Brown /** 1580414c70cbSLiam Girdwood * regulator_set_voltage - set regulator output voltage 1581414c70cbSLiam Girdwood * @regulator: regulator source 1582414c70cbSLiam Girdwood * @min_uV: Minimum required voltage in uV 1583414c70cbSLiam Girdwood * @max_uV: Maximum acceptable voltage in uV 1584414c70cbSLiam Girdwood * 1585414c70cbSLiam Girdwood * Sets a voltage regulator to the desired output voltage. This can be set 1586414c70cbSLiam Girdwood * during any regulator state. IOW, regulator can be disabled or enabled. 1587414c70cbSLiam Girdwood * 1588414c70cbSLiam Girdwood * If the regulator is enabled then the voltage will change to the new value 1589414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1590414c70cbSLiam Girdwood * output at the new voltage when enabled. 1591414c70cbSLiam Girdwood * 1592414c70cbSLiam Girdwood * NOTE: If the regulator is shared between several devices then the lowest 1593414c70cbSLiam Girdwood * request voltage that meets the system constraints will be used. 159469279fb9SMark Brown * Regulator system constraints must be set for this regulator before 1595414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1596414c70cbSLiam Girdwood */ 1597414c70cbSLiam Girdwood int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1598414c70cbSLiam Girdwood { 1599414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1600414c70cbSLiam Girdwood int ret; 1601414c70cbSLiam Girdwood 1602414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1603414c70cbSLiam Girdwood 1604414c70cbSLiam Girdwood /* sanity check */ 1605414c70cbSLiam Girdwood if (!rdev->desc->ops->set_voltage) { 1606414c70cbSLiam Girdwood ret = -EINVAL; 1607414c70cbSLiam Girdwood goto out; 1608414c70cbSLiam Girdwood } 1609414c70cbSLiam Girdwood 1610414c70cbSLiam Girdwood /* constraints check */ 1611414c70cbSLiam Girdwood ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1612414c70cbSLiam Girdwood if (ret < 0) 1613414c70cbSLiam Girdwood goto out; 1614414c70cbSLiam Girdwood regulator->min_uV = min_uV; 1615414c70cbSLiam Girdwood regulator->max_uV = max_uV; 1616414c70cbSLiam Girdwood ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1617414c70cbSLiam Girdwood 1618414c70cbSLiam Girdwood out: 1619b136fb44SJonathan Cameron _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1620414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1621414c70cbSLiam Girdwood return ret; 1622414c70cbSLiam Girdwood } 1623414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_voltage); 1624414c70cbSLiam Girdwood 1625414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev) 1626414c70cbSLiam Girdwood { 1627414c70cbSLiam Girdwood /* sanity check */ 1628414c70cbSLiam Girdwood if (rdev->desc->ops->get_voltage) 1629414c70cbSLiam Girdwood return rdev->desc->ops->get_voltage(rdev); 1630414c70cbSLiam Girdwood else 1631414c70cbSLiam Girdwood return -EINVAL; 1632414c70cbSLiam Girdwood } 1633414c70cbSLiam Girdwood 1634414c70cbSLiam Girdwood /** 1635414c70cbSLiam Girdwood * regulator_get_voltage - get regulator output voltage 1636414c70cbSLiam Girdwood * @regulator: regulator source 1637414c70cbSLiam Girdwood * 1638414c70cbSLiam Girdwood * This returns the current regulator voltage in uV. 1639414c70cbSLiam Girdwood * 1640414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the voltage value. This 1641414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1642414c70cbSLiam Girdwood */ 1643414c70cbSLiam Girdwood int regulator_get_voltage(struct regulator *regulator) 1644414c70cbSLiam Girdwood { 1645414c70cbSLiam Girdwood int ret; 1646414c70cbSLiam Girdwood 1647414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1648414c70cbSLiam Girdwood 1649414c70cbSLiam Girdwood ret = _regulator_get_voltage(regulator->rdev); 1650414c70cbSLiam Girdwood 1651414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 1652414c70cbSLiam Girdwood 1653414c70cbSLiam Girdwood return ret; 1654414c70cbSLiam Girdwood } 1655414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_voltage); 1656414c70cbSLiam Girdwood 1657414c70cbSLiam Girdwood /** 1658414c70cbSLiam Girdwood * regulator_set_current_limit - set regulator output current limit 1659414c70cbSLiam Girdwood * @regulator: regulator source 1660414c70cbSLiam Girdwood * @min_uA: Minimuum supported current in uA 1661414c70cbSLiam Girdwood * @max_uA: Maximum supported current in uA 1662414c70cbSLiam Girdwood * 1663414c70cbSLiam Girdwood * Sets current sink to the desired output current. This can be set during 1664414c70cbSLiam Girdwood * any regulator state. IOW, regulator can be disabled or enabled. 1665414c70cbSLiam Girdwood * 1666414c70cbSLiam Girdwood * If the regulator is enabled then the current will change to the new value 1667414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1668414c70cbSLiam Girdwood * output at the new current when enabled. 1669414c70cbSLiam Girdwood * 1670414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1671414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1672414c70cbSLiam Girdwood */ 1673414c70cbSLiam Girdwood int regulator_set_current_limit(struct regulator *regulator, 1674414c70cbSLiam Girdwood int min_uA, int max_uA) 1675414c70cbSLiam Girdwood { 1676414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1677414c70cbSLiam Girdwood int ret; 1678414c70cbSLiam Girdwood 1679414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1680414c70cbSLiam Girdwood 1681414c70cbSLiam Girdwood /* sanity check */ 1682414c70cbSLiam Girdwood if (!rdev->desc->ops->set_current_limit) { 1683414c70cbSLiam Girdwood ret = -EINVAL; 1684414c70cbSLiam Girdwood goto out; 1685414c70cbSLiam Girdwood } 1686414c70cbSLiam Girdwood 1687414c70cbSLiam Girdwood /* constraints check */ 1688414c70cbSLiam Girdwood ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1689414c70cbSLiam Girdwood if (ret < 0) 1690414c70cbSLiam Girdwood goto out; 1691414c70cbSLiam Girdwood 1692414c70cbSLiam Girdwood ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1693414c70cbSLiam Girdwood out: 1694414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1695414c70cbSLiam Girdwood return ret; 1696414c70cbSLiam Girdwood } 1697414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1698414c70cbSLiam Girdwood 1699414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev) 1700414c70cbSLiam Girdwood { 1701414c70cbSLiam Girdwood int ret; 1702414c70cbSLiam Girdwood 1703414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1704414c70cbSLiam Girdwood 1705414c70cbSLiam Girdwood /* sanity check */ 1706414c70cbSLiam Girdwood if (!rdev->desc->ops->get_current_limit) { 1707414c70cbSLiam Girdwood ret = -EINVAL; 1708414c70cbSLiam Girdwood goto out; 1709414c70cbSLiam Girdwood } 1710414c70cbSLiam Girdwood 1711414c70cbSLiam Girdwood ret = rdev->desc->ops->get_current_limit(rdev); 1712414c70cbSLiam Girdwood out: 1713414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1714414c70cbSLiam Girdwood return ret; 1715414c70cbSLiam Girdwood } 1716414c70cbSLiam Girdwood 1717414c70cbSLiam Girdwood /** 1718414c70cbSLiam Girdwood * regulator_get_current_limit - get regulator output current 1719414c70cbSLiam Girdwood * @regulator: regulator source 1720414c70cbSLiam Girdwood * 1721414c70cbSLiam Girdwood * This returns the current supplied by the specified current sink in uA. 1722414c70cbSLiam Girdwood * 1723414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the current value. This 1724414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1725414c70cbSLiam Girdwood */ 1726414c70cbSLiam Girdwood int regulator_get_current_limit(struct regulator *regulator) 1727414c70cbSLiam Girdwood { 1728414c70cbSLiam Girdwood return _regulator_get_current_limit(regulator->rdev); 1729414c70cbSLiam Girdwood } 1730414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1731414c70cbSLiam Girdwood 1732414c70cbSLiam Girdwood /** 1733414c70cbSLiam Girdwood * regulator_set_mode - set regulator operating mode 1734414c70cbSLiam Girdwood * @regulator: regulator source 1735414c70cbSLiam Girdwood * @mode: operating mode - one of the REGULATOR_MODE constants 1736414c70cbSLiam Girdwood * 1737414c70cbSLiam Girdwood * Set regulator operating mode to increase regulator efficiency or improve 1738414c70cbSLiam Girdwood * regulation performance. 1739414c70cbSLiam Girdwood * 1740414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1741414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1742414c70cbSLiam Girdwood */ 1743414c70cbSLiam Girdwood int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1744414c70cbSLiam Girdwood { 1745414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1746414c70cbSLiam Girdwood int ret; 1747500b4ac9SSundar R Iyer int regulator_curr_mode; 1748414c70cbSLiam Girdwood 1749414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1750414c70cbSLiam Girdwood 1751414c70cbSLiam Girdwood /* sanity check */ 1752414c70cbSLiam Girdwood if (!rdev->desc->ops->set_mode) { 1753414c70cbSLiam Girdwood ret = -EINVAL; 1754414c70cbSLiam Girdwood goto out; 1755414c70cbSLiam Girdwood } 1756414c70cbSLiam Girdwood 1757500b4ac9SSundar R Iyer /* return if the same mode is requested */ 1758500b4ac9SSundar R Iyer if (rdev->desc->ops->get_mode) { 1759500b4ac9SSundar R Iyer regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1760500b4ac9SSundar R Iyer if (regulator_curr_mode == mode) { 1761500b4ac9SSundar R Iyer ret = 0; 1762500b4ac9SSundar R Iyer goto out; 1763500b4ac9SSundar R Iyer } 1764500b4ac9SSundar R Iyer } 1765500b4ac9SSundar R Iyer 1766414c70cbSLiam Girdwood /* constraints check */ 1767414c70cbSLiam Girdwood ret = regulator_check_mode(rdev, mode); 1768414c70cbSLiam Girdwood if (ret < 0) 1769414c70cbSLiam Girdwood goto out; 1770414c70cbSLiam Girdwood 1771414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1772414c70cbSLiam Girdwood out: 1773414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1774414c70cbSLiam Girdwood return ret; 1775414c70cbSLiam Girdwood } 1776414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_mode); 1777414c70cbSLiam Girdwood 1778414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1779414c70cbSLiam Girdwood { 1780414c70cbSLiam Girdwood int ret; 1781414c70cbSLiam Girdwood 1782414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1783414c70cbSLiam Girdwood 1784414c70cbSLiam Girdwood /* sanity check */ 1785414c70cbSLiam Girdwood if (!rdev->desc->ops->get_mode) { 1786414c70cbSLiam Girdwood ret = -EINVAL; 1787414c70cbSLiam Girdwood goto out; 1788414c70cbSLiam Girdwood } 1789414c70cbSLiam Girdwood 1790414c70cbSLiam Girdwood ret = rdev->desc->ops->get_mode(rdev); 1791414c70cbSLiam Girdwood out: 1792414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1793414c70cbSLiam Girdwood return ret; 1794414c70cbSLiam Girdwood } 1795414c70cbSLiam Girdwood 1796414c70cbSLiam Girdwood /** 1797414c70cbSLiam Girdwood * regulator_get_mode - get regulator operating mode 1798414c70cbSLiam Girdwood * @regulator: regulator source 1799414c70cbSLiam Girdwood * 1800414c70cbSLiam Girdwood * Get the current regulator operating mode. 1801414c70cbSLiam Girdwood */ 1802414c70cbSLiam Girdwood unsigned int regulator_get_mode(struct regulator *regulator) 1803414c70cbSLiam Girdwood { 1804414c70cbSLiam Girdwood return _regulator_get_mode(regulator->rdev); 1805414c70cbSLiam Girdwood } 1806414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_mode); 1807414c70cbSLiam Girdwood 1808414c70cbSLiam Girdwood /** 1809414c70cbSLiam Girdwood * regulator_set_optimum_mode - set regulator optimum operating mode 1810414c70cbSLiam Girdwood * @regulator: regulator source 1811414c70cbSLiam Girdwood * @uA_load: load current 1812414c70cbSLiam Girdwood * 1813414c70cbSLiam Girdwood * Notifies the regulator core of a new device load. This is then used by 1814414c70cbSLiam Girdwood * DRMS (if enabled by constraints) to set the most efficient regulator 1815414c70cbSLiam Girdwood * operating mode for the new regulator loading. 1816414c70cbSLiam Girdwood * 1817414c70cbSLiam Girdwood * Consumer devices notify their supply regulator of the maximum power 1818414c70cbSLiam Girdwood * they will require (can be taken from device datasheet in the power 1819414c70cbSLiam Girdwood * consumption tables) when they change operational status and hence power 1820414c70cbSLiam Girdwood * state. Examples of operational state changes that can affect power 1821414c70cbSLiam Girdwood * consumption are :- 1822414c70cbSLiam Girdwood * 1823414c70cbSLiam Girdwood * o Device is opened / closed. 1824414c70cbSLiam Girdwood * o Device I/O is about to begin or has just finished. 1825414c70cbSLiam Girdwood * o Device is idling in between work. 1826414c70cbSLiam Girdwood * 1827414c70cbSLiam Girdwood * This information is also exported via sysfs to userspace. 1828414c70cbSLiam Girdwood * 1829414c70cbSLiam Girdwood * DRMS will sum the total requested load on the regulator and change 1830414c70cbSLiam Girdwood * to the most efficient operating mode if platform constraints allow. 1831414c70cbSLiam Girdwood * 1832414c70cbSLiam Girdwood * Returns the new regulator mode or error. 1833414c70cbSLiam Girdwood */ 1834414c70cbSLiam Girdwood int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1835414c70cbSLiam Girdwood { 1836414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1837414c70cbSLiam Girdwood struct regulator *consumer; 1838414c70cbSLiam Girdwood int ret, output_uV, input_uV, total_uA_load = 0; 1839414c70cbSLiam Girdwood unsigned int mode; 1840414c70cbSLiam Girdwood 1841414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1842414c70cbSLiam Girdwood 1843414c70cbSLiam Girdwood regulator->uA_load = uA_load; 1844414c70cbSLiam Girdwood ret = regulator_check_drms(rdev); 1845414c70cbSLiam Girdwood if (ret < 0) 1846414c70cbSLiam Girdwood goto out; 1847414c70cbSLiam Girdwood ret = -EINVAL; 1848414c70cbSLiam Girdwood 1849414c70cbSLiam Girdwood /* sanity check */ 1850414c70cbSLiam Girdwood if (!rdev->desc->ops->get_optimum_mode) 1851414c70cbSLiam Girdwood goto out; 1852414c70cbSLiam Girdwood 1853414c70cbSLiam Girdwood /* get output voltage */ 1854414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 1855414c70cbSLiam Girdwood if (output_uV <= 0) { 1856414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid output voltage found for %s\n", 18571083c393SMark Brown __func__, rdev_get_name(rdev)); 1858414c70cbSLiam Girdwood goto out; 1859414c70cbSLiam Girdwood } 1860414c70cbSLiam Girdwood 1861414c70cbSLiam Girdwood /* get input voltage */ 1862414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1863414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1864414c70cbSLiam Girdwood else 1865414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 1866414c70cbSLiam Girdwood if (input_uV <= 0) { 1867414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid input voltage found for %s\n", 18681083c393SMark Brown __func__, rdev_get_name(rdev)); 1869414c70cbSLiam Girdwood goto out; 1870414c70cbSLiam Girdwood } 1871414c70cbSLiam Girdwood 1872414c70cbSLiam Girdwood /* calc total requested load for this regulator */ 1873414c70cbSLiam Girdwood list_for_each_entry(consumer, &rdev->consumer_list, list) 1874414c70cbSLiam Girdwood total_uA_load += consumer->uA_load; 1875414c70cbSLiam Girdwood 1876414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, 1877414c70cbSLiam Girdwood input_uV, output_uV, 1878414c70cbSLiam Girdwood total_uA_load); 1879e573520bSDavid Brownell ret = regulator_check_mode(rdev, mode); 1880e573520bSDavid Brownell if (ret < 0) { 1881414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to get optimum mode for %s @" 18821083c393SMark Brown " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), 1883414c70cbSLiam Girdwood total_uA_load, input_uV, output_uV); 1884414c70cbSLiam Girdwood goto out; 1885414c70cbSLiam Girdwood } 1886414c70cbSLiam Girdwood 1887414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1888e573520bSDavid Brownell if (ret < 0) { 1889414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 18901083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 1891414c70cbSLiam Girdwood goto out; 1892414c70cbSLiam Girdwood } 1893414c70cbSLiam Girdwood ret = mode; 1894414c70cbSLiam Girdwood out: 1895414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1896414c70cbSLiam Girdwood return ret; 1897414c70cbSLiam Girdwood } 1898414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1899414c70cbSLiam Girdwood 1900414c70cbSLiam Girdwood /** 1901414c70cbSLiam Girdwood * regulator_register_notifier - register regulator event notifier 1902414c70cbSLiam Girdwood * @regulator: regulator source 190369279fb9SMark Brown * @nb: notifier block 1904414c70cbSLiam Girdwood * 1905414c70cbSLiam Girdwood * Register notifier block to receive regulator events. 1906414c70cbSLiam Girdwood */ 1907414c70cbSLiam Girdwood int regulator_register_notifier(struct regulator *regulator, 1908414c70cbSLiam Girdwood struct notifier_block *nb) 1909414c70cbSLiam Girdwood { 1910414c70cbSLiam Girdwood return blocking_notifier_chain_register(®ulator->rdev->notifier, 1911414c70cbSLiam Girdwood nb); 1912414c70cbSLiam Girdwood } 1913414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register_notifier); 1914414c70cbSLiam Girdwood 1915414c70cbSLiam Girdwood /** 1916414c70cbSLiam Girdwood * regulator_unregister_notifier - unregister regulator event notifier 1917414c70cbSLiam Girdwood * @regulator: regulator source 191869279fb9SMark Brown * @nb: notifier block 1919414c70cbSLiam Girdwood * 1920414c70cbSLiam Girdwood * Unregister regulator event notifier block. 1921414c70cbSLiam Girdwood */ 1922414c70cbSLiam Girdwood int regulator_unregister_notifier(struct regulator *regulator, 1923414c70cbSLiam Girdwood struct notifier_block *nb) 1924414c70cbSLiam Girdwood { 1925414c70cbSLiam Girdwood return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1926414c70cbSLiam Girdwood nb); 1927414c70cbSLiam Girdwood } 1928414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1929414c70cbSLiam Girdwood 1930b136fb44SJonathan Cameron /* notify regulator consumers and downstream regulator consumers. 1931b136fb44SJonathan Cameron * Note mutex must be held by caller. 1932b136fb44SJonathan Cameron */ 1933414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 1934414c70cbSLiam Girdwood unsigned long event, void *data) 1935414c70cbSLiam Girdwood { 1936414c70cbSLiam Girdwood struct regulator_dev *_rdev; 1937414c70cbSLiam Girdwood 1938414c70cbSLiam Girdwood /* call rdev chain first */ 1939414c70cbSLiam Girdwood blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1940414c70cbSLiam Girdwood 1941414c70cbSLiam Girdwood /* now notify regulator we supply */ 1942b136fb44SJonathan Cameron list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1943b136fb44SJonathan Cameron mutex_lock(&_rdev->mutex); 1944414c70cbSLiam Girdwood _notifier_call_chain(_rdev, event, data); 1945b136fb44SJonathan Cameron mutex_unlock(&_rdev->mutex); 1946b136fb44SJonathan Cameron } 1947414c70cbSLiam Girdwood } 1948414c70cbSLiam Girdwood 1949414c70cbSLiam Girdwood /** 1950414c70cbSLiam Girdwood * regulator_bulk_get - get multiple regulator consumers 1951414c70cbSLiam Girdwood * 1952414c70cbSLiam Girdwood * @dev: Device to supply 1953414c70cbSLiam Girdwood * @num_consumers: Number of consumers to register 1954414c70cbSLiam Girdwood * @consumers: Configuration of consumers; clients are stored here. 1955414c70cbSLiam Girdwood * 1956414c70cbSLiam Girdwood * @return 0 on success, an errno on failure. 1957414c70cbSLiam Girdwood * 1958414c70cbSLiam Girdwood * This helper function allows drivers to get several regulator 1959414c70cbSLiam Girdwood * consumers in one operation. If any of the regulators cannot be 1960414c70cbSLiam Girdwood * acquired then any regulators that were allocated will be freed 1961414c70cbSLiam Girdwood * before returning to the caller. 1962414c70cbSLiam Girdwood */ 1963414c70cbSLiam Girdwood int regulator_bulk_get(struct device *dev, int num_consumers, 1964414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 1965414c70cbSLiam Girdwood { 1966414c70cbSLiam Girdwood int i; 1967414c70cbSLiam Girdwood int ret; 1968414c70cbSLiam Girdwood 1969414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) 1970414c70cbSLiam Girdwood consumers[i].consumer = NULL; 1971414c70cbSLiam Girdwood 1972414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 1973414c70cbSLiam Girdwood consumers[i].consumer = regulator_get(dev, 1974414c70cbSLiam Girdwood consumers[i].supply); 1975414c70cbSLiam Girdwood if (IS_ERR(consumers[i].consumer)) { 1976414c70cbSLiam Girdwood ret = PTR_ERR(consumers[i].consumer); 19775b307627SMark Brown dev_err(dev, "Failed to get supply '%s': %d\n", 19785b307627SMark Brown consumers[i].supply, ret); 1979414c70cbSLiam Girdwood consumers[i].consumer = NULL; 1980414c70cbSLiam Girdwood goto err; 1981414c70cbSLiam Girdwood } 1982414c70cbSLiam Girdwood } 1983414c70cbSLiam Girdwood 1984414c70cbSLiam Girdwood return 0; 1985414c70cbSLiam Girdwood 1986414c70cbSLiam Girdwood err: 1987414c70cbSLiam Girdwood for (i = 0; i < num_consumers && consumers[i].consumer; i++) 1988414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 1989414c70cbSLiam Girdwood 1990414c70cbSLiam Girdwood return ret; 1991414c70cbSLiam Girdwood } 1992414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_get); 1993414c70cbSLiam Girdwood 1994414c70cbSLiam Girdwood /** 1995414c70cbSLiam Girdwood * regulator_bulk_enable - enable multiple regulator consumers 1996414c70cbSLiam Girdwood * 1997414c70cbSLiam Girdwood * @num_consumers: Number of consumers 1998414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 1999414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2000414c70cbSLiam Girdwood * 2001414c70cbSLiam Girdwood * This convenience API allows consumers to enable multiple regulator 2002414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2003414c70cbSLiam Girdwood * then any others that were enabled will be disabled again prior to 2004414c70cbSLiam Girdwood * return. 2005414c70cbSLiam Girdwood */ 2006414c70cbSLiam Girdwood int regulator_bulk_enable(int num_consumers, 2007414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2008414c70cbSLiam Girdwood { 2009414c70cbSLiam Girdwood int i; 2010414c70cbSLiam Girdwood int ret; 2011414c70cbSLiam Girdwood 2012414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2013414c70cbSLiam Girdwood ret = regulator_enable(consumers[i].consumer); 2014414c70cbSLiam Girdwood if (ret != 0) 2015414c70cbSLiam Girdwood goto err; 2016414c70cbSLiam Girdwood } 2017414c70cbSLiam Girdwood 2018414c70cbSLiam Girdwood return 0; 2019414c70cbSLiam Girdwood 2020414c70cbSLiam Girdwood err: 20215b307627SMark Brown printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); 2022eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2023414c70cbSLiam Girdwood regulator_disable(consumers[i].consumer); 2024414c70cbSLiam Girdwood 2025414c70cbSLiam Girdwood return ret; 2026414c70cbSLiam Girdwood } 2027414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2028414c70cbSLiam Girdwood 2029414c70cbSLiam Girdwood /** 2030414c70cbSLiam Girdwood * regulator_bulk_disable - disable multiple regulator consumers 2031414c70cbSLiam Girdwood * 2032414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2033414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2034414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2035414c70cbSLiam Girdwood * 2036414c70cbSLiam Girdwood * This convenience API allows consumers to disable multiple regulator 2037414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2038414c70cbSLiam Girdwood * then any others that were disabled will be disabled again prior to 2039414c70cbSLiam Girdwood * return. 2040414c70cbSLiam Girdwood */ 2041414c70cbSLiam Girdwood int regulator_bulk_disable(int num_consumers, 2042414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2043414c70cbSLiam Girdwood { 2044414c70cbSLiam Girdwood int i; 2045414c70cbSLiam Girdwood int ret; 2046414c70cbSLiam Girdwood 2047414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2048414c70cbSLiam Girdwood ret = regulator_disable(consumers[i].consumer); 2049414c70cbSLiam Girdwood if (ret != 0) 2050414c70cbSLiam Girdwood goto err; 2051414c70cbSLiam Girdwood } 2052414c70cbSLiam Girdwood 2053414c70cbSLiam Girdwood return 0; 2054414c70cbSLiam Girdwood 2055414c70cbSLiam Girdwood err: 20565b307627SMark Brown printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, 20575b307627SMark Brown ret); 2058eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2059414c70cbSLiam Girdwood regulator_enable(consumers[i].consumer); 2060414c70cbSLiam Girdwood 2061414c70cbSLiam Girdwood return ret; 2062414c70cbSLiam Girdwood } 2063414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2064414c70cbSLiam Girdwood 2065414c70cbSLiam Girdwood /** 2066414c70cbSLiam Girdwood * regulator_bulk_free - free multiple regulator consumers 2067414c70cbSLiam Girdwood * 2068414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2069414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2070414c70cbSLiam Girdwood * 2071414c70cbSLiam Girdwood * This convenience API allows consumers to free multiple regulator 2072414c70cbSLiam Girdwood * clients in a single API call. 2073414c70cbSLiam Girdwood */ 2074414c70cbSLiam Girdwood void regulator_bulk_free(int num_consumers, 2075414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2076414c70cbSLiam Girdwood { 2077414c70cbSLiam Girdwood int i; 2078414c70cbSLiam Girdwood 2079414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2080414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2081414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2082414c70cbSLiam Girdwood } 2083414c70cbSLiam Girdwood } 2084414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_free); 2085414c70cbSLiam Girdwood 2086414c70cbSLiam Girdwood /** 2087414c70cbSLiam Girdwood * regulator_notifier_call_chain - call regulator event notifier 208869279fb9SMark Brown * @rdev: regulator source 2089414c70cbSLiam Girdwood * @event: notifier block 209069279fb9SMark Brown * @data: callback-specific data. 2091414c70cbSLiam Girdwood * 2092414c70cbSLiam Girdwood * Called by regulator drivers to notify clients a regulator event has 2093414c70cbSLiam Girdwood * occurred. We also notify regulator clients downstream. 2094b136fb44SJonathan Cameron * Note lock must be held by caller. 2095414c70cbSLiam Girdwood */ 2096414c70cbSLiam Girdwood int regulator_notifier_call_chain(struct regulator_dev *rdev, 2097414c70cbSLiam Girdwood unsigned long event, void *data) 2098414c70cbSLiam Girdwood { 2099414c70cbSLiam Girdwood _notifier_call_chain(rdev, event, data); 2100414c70cbSLiam Girdwood return NOTIFY_DONE; 2101414c70cbSLiam Girdwood 2102414c70cbSLiam Girdwood } 2103414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2104414c70cbSLiam Girdwood 2105be721979SMark Brown /** 2106be721979SMark Brown * regulator_mode_to_status - convert a regulator mode into a status 2107be721979SMark Brown * 2108be721979SMark Brown * @mode: Mode to convert 2109be721979SMark Brown * 2110be721979SMark Brown * Convert a regulator mode into a status. 2111be721979SMark Brown */ 2112be721979SMark Brown int regulator_mode_to_status(unsigned int mode) 2113be721979SMark Brown { 2114be721979SMark Brown switch (mode) { 2115be721979SMark Brown case REGULATOR_MODE_FAST: 2116be721979SMark Brown return REGULATOR_STATUS_FAST; 2117be721979SMark Brown case REGULATOR_MODE_NORMAL: 2118be721979SMark Brown return REGULATOR_STATUS_NORMAL; 2119be721979SMark Brown case REGULATOR_MODE_IDLE: 2120be721979SMark Brown return REGULATOR_STATUS_IDLE; 2121be721979SMark Brown case REGULATOR_STATUS_STANDBY: 2122be721979SMark Brown return REGULATOR_STATUS_STANDBY; 2123be721979SMark Brown default: 2124be721979SMark Brown return 0; 2125be721979SMark Brown } 2126be721979SMark Brown } 2127be721979SMark Brown EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2128be721979SMark Brown 21297ad68e2fSDavid Brownell /* 21307ad68e2fSDavid Brownell * To avoid cluttering sysfs (and memory) with useless state, only 21317ad68e2fSDavid Brownell * create attributes that can be meaningfully displayed. 21327ad68e2fSDavid Brownell */ 21337ad68e2fSDavid Brownell static int add_regulator_attributes(struct regulator_dev *rdev) 21347ad68e2fSDavid Brownell { 21357ad68e2fSDavid Brownell struct device *dev = &rdev->dev; 21367ad68e2fSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 21377ad68e2fSDavid Brownell int status = 0; 21387ad68e2fSDavid Brownell 21397ad68e2fSDavid Brownell /* some attributes need specific methods to be displayed */ 21407ad68e2fSDavid Brownell if (ops->get_voltage) { 21417ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microvolts); 21427ad68e2fSDavid Brownell if (status < 0) 21437ad68e2fSDavid Brownell return status; 21447ad68e2fSDavid Brownell } 21457ad68e2fSDavid Brownell if (ops->get_current_limit) { 21467ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microamps); 21477ad68e2fSDavid Brownell if (status < 0) 21487ad68e2fSDavid Brownell return status; 21497ad68e2fSDavid Brownell } 21507ad68e2fSDavid Brownell if (ops->get_mode) { 21517ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_opmode); 21527ad68e2fSDavid Brownell if (status < 0) 21537ad68e2fSDavid Brownell return status; 21547ad68e2fSDavid Brownell } 21557ad68e2fSDavid Brownell if (ops->is_enabled) { 21567ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_state); 21577ad68e2fSDavid Brownell if (status < 0) 21587ad68e2fSDavid Brownell return status; 21597ad68e2fSDavid Brownell } 2160853116a1SDavid Brownell if (ops->get_status) { 2161853116a1SDavid Brownell status = device_create_file(dev, &dev_attr_status); 2162853116a1SDavid Brownell if (status < 0) 2163853116a1SDavid Brownell return status; 2164853116a1SDavid Brownell } 21657ad68e2fSDavid Brownell 21667ad68e2fSDavid Brownell /* some attributes are type-specific */ 21677ad68e2fSDavid Brownell if (rdev->desc->type == REGULATOR_CURRENT) { 21687ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_requested_microamps); 21697ad68e2fSDavid Brownell if (status < 0) 21707ad68e2fSDavid Brownell return status; 21717ad68e2fSDavid Brownell } 21727ad68e2fSDavid Brownell 21737ad68e2fSDavid Brownell /* all the other attributes exist to support constraints; 21747ad68e2fSDavid Brownell * don't show them if there are no constraints, or if the 21757ad68e2fSDavid Brownell * relevant supporting methods are missing. 21767ad68e2fSDavid Brownell */ 21777ad68e2fSDavid Brownell if (!rdev->constraints) 21787ad68e2fSDavid Brownell return status; 21797ad68e2fSDavid Brownell 21807ad68e2fSDavid Brownell /* constraints need specific supporting methods */ 21817ad68e2fSDavid Brownell if (ops->set_voltage) { 21827ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microvolts); 21837ad68e2fSDavid Brownell if (status < 0) 21847ad68e2fSDavid Brownell return status; 21857ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microvolts); 21867ad68e2fSDavid Brownell if (status < 0) 21877ad68e2fSDavid Brownell return status; 21887ad68e2fSDavid Brownell } 21897ad68e2fSDavid Brownell if (ops->set_current_limit) { 21907ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microamps); 21917ad68e2fSDavid Brownell if (status < 0) 21927ad68e2fSDavid Brownell return status; 21937ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microamps); 21947ad68e2fSDavid Brownell if (status < 0) 21957ad68e2fSDavid Brownell return status; 21967ad68e2fSDavid Brownell } 21977ad68e2fSDavid Brownell 21987ad68e2fSDavid Brownell /* suspend mode constraints need multiple supporting methods */ 21997ad68e2fSDavid Brownell if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 22007ad68e2fSDavid Brownell return status; 22017ad68e2fSDavid Brownell 22027ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_standby_state); 22037ad68e2fSDavid Brownell if (status < 0) 22047ad68e2fSDavid Brownell return status; 22057ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_mem_state); 22067ad68e2fSDavid Brownell if (status < 0) 22077ad68e2fSDavid Brownell return status; 22087ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_disk_state); 22097ad68e2fSDavid Brownell if (status < 0) 22107ad68e2fSDavid Brownell return status; 22117ad68e2fSDavid Brownell 22127ad68e2fSDavid Brownell if (ops->set_suspend_voltage) { 22137ad68e2fSDavid Brownell status = device_create_file(dev, 22147ad68e2fSDavid Brownell &dev_attr_suspend_standby_microvolts); 22157ad68e2fSDavid Brownell if (status < 0) 22167ad68e2fSDavid Brownell return status; 22177ad68e2fSDavid Brownell status = device_create_file(dev, 22187ad68e2fSDavid Brownell &dev_attr_suspend_mem_microvolts); 22197ad68e2fSDavid Brownell if (status < 0) 22207ad68e2fSDavid Brownell return status; 22217ad68e2fSDavid Brownell status = device_create_file(dev, 22227ad68e2fSDavid Brownell &dev_attr_suspend_disk_microvolts); 22237ad68e2fSDavid Brownell if (status < 0) 22247ad68e2fSDavid Brownell return status; 22257ad68e2fSDavid Brownell } 22267ad68e2fSDavid Brownell 22277ad68e2fSDavid Brownell if (ops->set_suspend_mode) { 22287ad68e2fSDavid Brownell status = device_create_file(dev, 22297ad68e2fSDavid Brownell &dev_attr_suspend_standby_mode); 22307ad68e2fSDavid Brownell if (status < 0) 22317ad68e2fSDavid Brownell return status; 22327ad68e2fSDavid Brownell status = device_create_file(dev, 22337ad68e2fSDavid Brownell &dev_attr_suspend_mem_mode); 22347ad68e2fSDavid Brownell if (status < 0) 22357ad68e2fSDavid Brownell return status; 22367ad68e2fSDavid Brownell status = device_create_file(dev, 22377ad68e2fSDavid Brownell &dev_attr_suspend_disk_mode); 22387ad68e2fSDavid Brownell if (status < 0) 22397ad68e2fSDavid Brownell return status; 22407ad68e2fSDavid Brownell } 22417ad68e2fSDavid Brownell 22427ad68e2fSDavid Brownell return status; 22437ad68e2fSDavid Brownell } 22447ad68e2fSDavid Brownell 2245414c70cbSLiam Girdwood /** 2246414c70cbSLiam Girdwood * regulator_register - register regulator 224769279fb9SMark Brown * @regulator_desc: regulator to register 224869279fb9SMark Brown * @dev: struct device for the regulator 22490527100fSMark Brown * @init_data: platform provided init data, passed through by driver 225069279fb9SMark Brown * @driver_data: private regulator data 2251414c70cbSLiam Girdwood * 2252414c70cbSLiam Girdwood * Called by regulator drivers to register a regulator. 2253414c70cbSLiam Girdwood * Returns 0 on success. 2254414c70cbSLiam Girdwood */ 2255414c70cbSLiam Girdwood struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 22560527100fSMark Brown struct device *dev, struct regulator_init_data *init_data, 22570527100fSMark Brown void *driver_data) 2258414c70cbSLiam Girdwood { 2259414c70cbSLiam Girdwood static atomic_t regulator_no = ATOMIC_INIT(0); 2260414c70cbSLiam Girdwood struct regulator_dev *rdev; 2261a5766f11SLiam Girdwood int ret, i; 2262414c70cbSLiam Girdwood 2263414c70cbSLiam Girdwood if (regulator_desc == NULL) 2264414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2265414c70cbSLiam Girdwood 2266414c70cbSLiam Girdwood if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2267414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2268414c70cbSLiam Girdwood 2269cd78dfc6SDiego Liziero if (regulator_desc->type != REGULATOR_VOLTAGE && 2270cd78dfc6SDiego Liziero regulator_desc->type != REGULATOR_CURRENT) 2271414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2272414c70cbSLiam Girdwood 227346fabe1eSMark Brown if (!init_data) 227446fabe1eSMark Brown return ERR_PTR(-EINVAL); 227546fabe1eSMark Brown 2276414c70cbSLiam Girdwood rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2277414c70cbSLiam Girdwood if (rdev == NULL) 2278414c70cbSLiam Girdwood return ERR_PTR(-ENOMEM); 2279414c70cbSLiam Girdwood 2280414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2281414c70cbSLiam Girdwood 2282414c70cbSLiam Girdwood mutex_init(&rdev->mutex); 2283a5766f11SLiam Girdwood rdev->reg_data = driver_data; 2284414c70cbSLiam Girdwood rdev->owner = regulator_desc->owner; 2285414c70cbSLiam Girdwood rdev->desc = regulator_desc; 2286414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->consumer_list); 2287414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->supply_list); 2288414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->list); 2289414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->slist); 2290414c70cbSLiam Girdwood BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2291414c70cbSLiam Girdwood 2292a5766f11SLiam Girdwood /* preform any regulator specific init */ 2293a5766f11SLiam Girdwood if (init_data->regulator_init) { 2294a5766f11SLiam Girdwood ret = init_data->regulator_init(rdev->reg_data); 22954fca9545SDavid Brownell if (ret < 0) 22964fca9545SDavid Brownell goto clean; 2297a5766f11SLiam Girdwood } 2298a5766f11SLiam Girdwood 2299a5766f11SLiam Girdwood /* register with sysfs */ 2300a5766f11SLiam Girdwood rdev->dev.class = ®ulator_class; 2301a5766f11SLiam Girdwood rdev->dev.parent = dev; 2302812460a9SKay Sievers dev_set_name(&rdev->dev, "regulator.%d", 2303812460a9SKay Sievers atomic_inc_return(®ulator_no) - 1); 2304a5766f11SLiam Girdwood ret = device_register(&rdev->dev); 2305ad7725cbSVasiliy Kulikov if (ret != 0) { 2306ad7725cbSVasiliy Kulikov put_device(&rdev->dev); 23074fca9545SDavid Brownell goto clean; 2308ad7725cbSVasiliy Kulikov } 2309a5766f11SLiam Girdwood 2310a5766f11SLiam Girdwood dev_set_drvdata(&rdev->dev, rdev); 2311a5766f11SLiam Girdwood 231274f544c1SMike Rapoport /* set regulator constraints */ 231374f544c1SMike Rapoport ret = set_machine_constraints(rdev, &init_data->constraints); 231474f544c1SMike Rapoport if (ret < 0) 231574f544c1SMike Rapoport goto scrub; 231674f544c1SMike Rapoport 23177ad68e2fSDavid Brownell /* add attributes supported by this regulator */ 23187ad68e2fSDavid Brownell ret = add_regulator_attributes(rdev); 23197ad68e2fSDavid Brownell if (ret < 0) 23207ad68e2fSDavid Brownell goto scrub; 23217ad68e2fSDavid Brownell 2322a5766f11SLiam Girdwood /* set supply regulator if it exists */ 23230178f3e2SMark Brown if (init_data->supply_regulator && init_data->supply_regulator_dev) { 23240178f3e2SMark Brown dev_err(dev, 23250178f3e2SMark Brown "Supply regulator specified by both name and dev\n"); 23260178f3e2SMark Brown goto scrub; 23270178f3e2SMark Brown } 23280178f3e2SMark Brown 23290178f3e2SMark Brown if (init_data->supply_regulator) { 23300178f3e2SMark Brown struct regulator_dev *r; 23310178f3e2SMark Brown int found = 0; 23320178f3e2SMark Brown 23330178f3e2SMark Brown list_for_each_entry(r, ®ulator_list, list) { 23340178f3e2SMark Brown if (strcmp(rdev_get_name(r), 23350178f3e2SMark Brown init_data->supply_regulator) == 0) { 23360178f3e2SMark Brown found = 1; 23370178f3e2SMark Brown break; 23380178f3e2SMark Brown } 23390178f3e2SMark Brown } 23400178f3e2SMark Brown 23410178f3e2SMark Brown if (!found) { 23420178f3e2SMark Brown dev_err(dev, "Failed to find supply %s\n", 23430178f3e2SMark Brown init_data->supply_regulator); 23440178f3e2SMark Brown goto scrub; 23450178f3e2SMark Brown } 23460178f3e2SMark Brown 23470178f3e2SMark Brown ret = set_supply(rdev, r); 23480178f3e2SMark Brown if (ret < 0) 23490178f3e2SMark Brown goto scrub; 23500178f3e2SMark Brown } 23510178f3e2SMark Brown 2352a5766f11SLiam Girdwood if (init_data->supply_regulator_dev) { 23530178f3e2SMark Brown dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2354a5766f11SLiam Girdwood ret = set_supply(rdev, 2355a5766f11SLiam Girdwood dev_get_drvdata(init_data->supply_regulator_dev)); 23564fca9545SDavid Brownell if (ret < 0) 23574fca9545SDavid Brownell goto scrub; 2358a5766f11SLiam Girdwood } 2359a5766f11SLiam Girdwood 2360a5766f11SLiam Girdwood /* add consumers devices */ 2361a5766f11SLiam Girdwood for (i = 0; i < init_data->num_consumer_supplies; i++) { 2362a5766f11SLiam Girdwood ret = set_consumer_device_supply(rdev, 2363a5766f11SLiam Girdwood init_data->consumer_supplies[i].dev, 236440f9244fSMark Brown init_data->consumer_supplies[i].dev_name, 2365a5766f11SLiam Girdwood init_data->consumer_supplies[i].supply); 2366d4033b54SJani Nikula if (ret < 0) 2367d4033b54SJani Nikula goto unset_supplies; 2368a5766f11SLiam Girdwood } 2369a5766f11SLiam Girdwood 2370a5766f11SLiam Girdwood list_add(&rdev->list, ®ulator_list); 2371a5766f11SLiam Girdwood out: 2372414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2373414c70cbSLiam Girdwood return rdev; 23744fca9545SDavid Brownell 2375d4033b54SJani Nikula unset_supplies: 2376d4033b54SJani Nikula unset_regulator_supplies(rdev); 2377d4033b54SJani Nikula 23784fca9545SDavid Brownell scrub: 23794fca9545SDavid Brownell device_unregister(&rdev->dev); 238053032dafSPaul Walmsley /* device core frees rdev */ 238153032dafSPaul Walmsley rdev = ERR_PTR(ret); 238253032dafSPaul Walmsley goto out; 238353032dafSPaul Walmsley 23844fca9545SDavid Brownell clean: 23854fca9545SDavid Brownell kfree(rdev); 23864fca9545SDavid Brownell rdev = ERR_PTR(ret); 23874fca9545SDavid Brownell goto out; 2388414c70cbSLiam Girdwood } 2389414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register); 2390414c70cbSLiam Girdwood 2391414c70cbSLiam Girdwood /** 2392414c70cbSLiam Girdwood * regulator_unregister - unregister regulator 239369279fb9SMark Brown * @rdev: regulator to unregister 2394414c70cbSLiam Girdwood * 2395414c70cbSLiam Girdwood * Called by regulator drivers to unregister a regulator. 2396414c70cbSLiam Girdwood */ 2397414c70cbSLiam Girdwood void regulator_unregister(struct regulator_dev *rdev) 2398414c70cbSLiam Girdwood { 2399414c70cbSLiam Girdwood if (rdev == NULL) 2400414c70cbSLiam Girdwood return; 2401414c70cbSLiam Girdwood 2402414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 24036bf87d17SMark Brown WARN_ON(rdev->open_count); 24040f1d747bSMike Rapoport unset_regulator_supplies(rdev); 2405414c70cbSLiam Girdwood list_del(&rdev->list); 2406414c70cbSLiam Girdwood if (rdev->supply) 2407414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, "supply"); 2408414c70cbSLiam Girdwood device_unregister(&rdev->dev); 2409414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2410414c70cbSLiam Girdwood } 2411414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister); 2412414c70cbSLiam Girdwood 2413414c70cbSLiam Girdwood /** 2414cf7bbcdfSMark Brown * regulator_suspend_prepare - prepare regulators for system wide suspend 2415414c70cbSLiam Girdwood * @state: system suspend state 2416414c70cbSLiam Girdwood * 2417414c70cbSLiam Girdwood * Configure each regulator with it's suspend operating parameters for state. 2418414c70cbSLiam Girdwood * This will usually be called by machine suspend code prior to supending. 2419414c70cbSLiam Girdwood */ 2420414c70cbSLiam Girdwood int regulator_suspend_prepare(suspend_state_t state) 2421414c70cbSLiam Girdwood { 2422414c70cbSLiam Girdwood struct regulator_dev *rdev; 2423414c70cbSLiam Girdwood int ret = 0; 2424414c70cbSLiam Girdwood 2425414c70cbSLiam Girdwood /* ON is handled by regulator active state */ 2426414c70cbSLiam Girdwood if (state == PM_SUSPEND_ON) 2427414c70cbSLiam Girdwood return -EINVAL; 2428414c70cbSLiam Girdwood 2429414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2430414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 2431414c70cbSLiam Girdwood 2432414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2433414c70cbSLiam Girdwood ret = suspend_prepare(rdev, state); 2434414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2435414c70cbSLiam Girdwood 2436414c70cbSLiam Girdwood if (ret < 0) { 2437414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to prepare %s\n", 24381083c393SMark Brown __func__, rdev_get_name(rdev)); 2439414c70cbSLiam Girdwood goto out; 2440414c70cbSLiam Girdwood } 2441414c70cbSLiam Girdwood } 2442414c70cbSLiam Girdwood out: 2443414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2444414c70cbSLiam Girdwood return ret; 2445414c70cbSLiam Girdwood } 2446414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2447414c70cbSLiam Girdwood 2448414c70cbSLiam Girdwood /** 2449ca725561SMark Brown * regulator_has_full_constraints - the system has fully specified constraints 2450ca725561SMark Brown * 2451ca725561SMark Brown * Calling this function will cause the regulator API to disable all 2452ca725561SMark Brown * regulators which have a zero use count and don't have an always_on 2453ca725561SMark Brown * constraint in a late_initcall. 2454ca725561SMark Brown * 2455ca725561SMark Brown * The intention is that this will become the default behaviour in a 2456ca725561SMark Brown * future kernel release so users are encouraged to use this facility 2457ca725561SMark Brown * now. 2458ca725561SMark Brown */ 2459ca725561SMark Brown void regulator_has_full_constraints(void) 2460ca725561SMark Brown { 2461ca725561SMark Brown has_full_constraints = 1; 2462ca725561SMark Brown } 2463ca725561SMark Brown EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2464ca725561SMark Brown 2465ca725561SMark Brown /** 2466414c70cbSLiam Girdwood * rdev_get_drvdata - get rdev regulator driver data 246769279fb9SMark Brown * @rdev: regulator 2468414c70cbSLiam Girdwood * 2469414c70cbSLiam Girdwood * Get rdev regulator driver private data. This call can be used in the 2470414c70cbSLiam Girdwood * regulator driver context. 2471414c70cbSLiam Girdwood */ 2472414c70cbSLiam Girdwood void *rdev_get_drvdata(struct regulator_dev *rdev) 2473414c70cbSLiam Girdwood { 2474414c70cbSLiam Girdwood return rdev->reg_data; 2475414c70cbSLiam Girdwood } 2476414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2477414c70cbSLiam Girdwood 2478414c70cbSLiam Girdwood /** 2479414c70cbSLiam Girdwood * regulator_get_drvdata - get regulator driver data 2480414c70cbSLiam Girdwood * @regulator: regulator 2481414c70cbSLiam Girdwood * 2482414c70cbSLiam Girdwood * Get regulator driver private data. This call can be used in the consumer 2483414c70cbSLiam Girdwood * driver context when non API regulator specific functions need to be called. 2484414c70cbSLiam Girdwood */ 2485414c70cbSLiam Girdwood void *regulator_get_drvdata(struct regulator *regulator) 2486414c70cbSLiam Girdwood { 2487414c70cbSLiam Girdwood return regulator->rdev->reg_data; 2488414c70cbSLiam Girdwood } 2489414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2490414c70cbSLiam Girdwood 2491414c70cbSLiam Girdwood /** 2492414c70cbSLiam Girdwood * regulator_set_drvdata - set regulator driver data 2493414c70cbSLiam Girdwood * @regulator: regulator 2494414c70cbSLiam Girdwood * @data: data 2495414c70cbSLiam Girdwood */ 2496414c70cbSLiam Girdwood void regulator_set_drvdata(struct regulator *regulator, void *data) 2497414c70cbSLiam Girdwood { 2498414c70cbSLiam Girdwood regulator->rdev->reg_data = data; 2499414c70cbSLiam Girdwood } 2500414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2501414c70cbSLiam Girdwood 2502414c70cbSLiam Girdwood /** 2503414c70cbSLiam Girdwood * regulator_get_id - get regulator ID 250469279fb9SMark Brown * @rdev: regulator 2505414c70cbSLiam Girdwood */ 2506414c70cbSLiam Girdwood int rdev_get_id(struct regulator_dev *rdev) 2507414c70cbSLiam Girdwood { 2508414c70cbSLiam Girdwood return rdev->desc->id; 2509414c70cbSLiam Girdwood } 2510414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_id); 2511414c70cbSLiam Girdwood 2512a5766f11SLiam Girdwood struct device *rdev_get_dev(struct regulator_dev *rdev) 2513a5766f11SLiam Girdwood { 2514a5766f11SLiam Girdwood return &rdev->dev; 2515a5766f11SLiam Girdwood } 2516a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_dev); 2517a5766f11SLiam Girdwood 2518a5766f11SLiam Girdwood void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2519a5766f11SLiam Girdwood { 2520a5766f11SLiam Girdwood return reg_init_data->driver_data; 2521a5766f11SLiam Girdwood } 2522a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2523a5766f11SLiam Girdwood 2524414c70cbSLiam Girdwood static int __init regulator_init(void) 2525414c70cbSLiam Girdwood { 252634abbd68SMark Brown int ret; 252734abbd68SMark Brown 2528414c70cbSLiam Girdwood printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 252934abbd68SMark Brown 253034abbd68SMark Brown ret = class_register(®ulator_class); 253134abbd68SMark Brown 253234abbd68SMark Brown regulator_dummy_init(); 253334abbd68SMark Brown 253434abbd68SMark Brown return ret; 2535414c70cbSLiam Girdwood } 2536414c70cbSLiam Girdwood 2537414c70cbSLiam Girdwood /* init early to allow our consumers to complete system booting */ 2538414c70cbSLiam Girdwood core_initcall(regulator_init); 2539ca725561SMark Brown 2540ca725561SMark Brown static int __init regulator_init_complete(void) 2541ca725561SMark Brown { 2542ca725561SMark Brown struct regulator_dev *rdev; 2543ca725561SMark Brown struct regulator_ops *ops; 2544ca725561SMark Brown struct regulation_constraints *c; 2545ca725561SMark Brown int enabled, ret; 2546ca725561SMark Brown const char *name; 2547ca725561SMark Brown 2548ca725561SMark Brown mutex_lock(®ulator_list_mutex); 2549ca725561SMark Brown 2550ca725561SMark Brown /* If we have a full configuration then disable any regulators 2551ca725561SMark Brown * which are not in use or always_on. This will become the 2552ca725561SMark Brown * default behaviour in the future. 2553ca725561SMark Brown */ 2554ca725561SMark Brown list_for_each_entry(rdev, ®ulator_list, list) { 2555ca725561SMark Brown ops = rdev->desc->ops; 2556ca725561SMark Brown c = rdev->constraints; 2557ca725561SMark Brown 25581083c393SMark Brown name = rdev_get_name(rdev); 2559ca725561SMark Brown 2560f25e0b4fSMark Brown if (!ops->disable || (c && c->always_on)) 2561ca725561SMark Brown continue; 2562ca725561SMark Brown 2563ca725561SMark Brown mutex_lock(&rdev->mutex); 2564ca725561SMark Brown 2565ca725561SMark Brown if (rdev->use_count) 2566ca725561SMark Brown goto unlock; 2567ca725561SMark Brown 2568ca725561SMark Brown /* If we can't read the status assume it's on. */ 2569ca725561SMark Brown if (ops->is_enabled) 2570ca725561SMark Brown enabled = ops->is_enabled(rdev); 2571ca725561SMark Brown else 2572ca725561SMark Brown enabled = 1; 2573ca725561SMark Brown 2574ca725561SMark Brown if (!enabled) 2575ca725561SMark Brown goto unlock; 2576ca725561SMark Brown 2577ca725561SMark Brown if (has_full_constraints) { 2578ca725561SMark Brown /* We log since this may kill the system if it 2579ca725561SMark Brown * goes wrong. */ 2580ca725561SMark Brown printk(KERN_INFO "%s: disabling %s\n", 2581ca725561SMark Brown __func__, name); 2582ca725561SMark Brown ret = ops->disable(rdev); 2583ca725561SMark Brown if (ret != 0) { 2584ca725561SMark Brown printk(KERN_ERR 2585ca725561SMark Brown "%s: couldn't disable %s: %d\n", 2586ca725561SMark Brown __func__, name, ret); 2587ca725561SMark Brown } 2588ca725561SMark Brown } else { 2589ca725561SMark Brown /* The intention is that in future we will 2590ca725561SMark Brown * assume that full constraints are provided 2591ca725561SMark Brown * so warn even if we aren't going to do 2592ca725561SMark Brown * anything here. 2593ca725561SMark Brown */ 2594ca725561SMark Brown printk(KERN_WARNING 2595ca725561SMark Brown "%s: incomplete constraints, leaving %s on\n", 2596ca725561SMark Brown __func__, name); 2597ca725561SMark Brown } 2598ca725561SMark Brown 2599ca725561SMark Brown unlock: 2600ca725561SMark Brown mutex_unlock(&rdev->mutex); 2601ca725561SMark Brown } 2602ca725561SMark Brown 2603ca725561SMark Brown mutex_unlock(®ulator_list_mutex); 2604ca725561SMark Brown 2605ca725561SMark Brown return 0; 2606ca725561SMark Brown } 2607ca725561SMark Brown late_initcall(regulator_init_complete); 2608