1414c70cbSLiam Girdwood /* 2414c70cbSLiam Girdwood * core.c -- Voltage/Current Regulator framework. 3414c70cbSLiam Girdwood * 4414c70cbSLiam Girdwood * Copyright 2007, 2008 Wolfson Microelectronics PLC. 5a5766f11SLiam Girdwood * Copyright 2008 SlimLogic Ltd. 6414c70cbSLiam Girdwood * 7a5766f11SLiam Girdwood * Author: Liam Girdwood <lrg@slimlogic.co.uk> 8414c70cbSLiam Girdwood * 9414c70cbSLiam Girdwood * This program is free software; you can redistribute it and/or modify it 10414c70cbSLiam Girdwood * under the terms of the GNU General Public License as published by the 11414c70cbSLiam Girdwood * Free Software Foundation; either version 2 of the License, or (at your 12414c70cbSLiam Girdwood * option) any later version. 13414c70cbSLiam Girdwood * 14414c70cbSLiam Girdwood */ 15414c70cbSLiam Girdwood 16414c70cbSLiam Girdwood #include <linux/kernel.h> 17414c70cbSLiam Girdwood #include <linux/init.h> 18414c70cbSLiam Girdwood #include <linux/device.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 20414c70cbSLiam Girdwood #include <linux/err.h> 21414c70cbSLiam Girdwood #include <linux/mutex.h> 22414c70cbSLiam Girdwood #include <linux/suspend.h> 2331aae2beSMark Brown #include <linux/delay.h> 24414c70cbSLiam Girdwood #include <linux/regulator/consumer.h> 25414c70cbSLiam Girdwood #include <linux/regulator/driver.h> 26414c70cbSLiam Girdwood #include <linux/regulator/machine.h> 27414c70cbSLiam Girdwood 2834abbd68SMark Brown #include "dummy.h" 2934abbd68SMark Brown 30414c70cbSLiam Girdwood #define REGULATOR_VERSION "0.5" 31414c70cbSLiam Girdwood 32414c70cbSLiam Girdwood static DEFINE_MUTEX(regulator_list_mutex); 33414c70cbSLiam Girdwood static LIST_HEAD(regulator_list); 34414c70cbSLiam Girdwood static LIST_HEAD(regulator_map_list); 35ca725561SMark Brown static int has_full_constraints; 36688fe99aSMark Brown static bool board_wants_dummy_regulator; 37414c70cbSLiam Girdwood 388dc5390dSMark Brown /* 39414c70cbSLiam Girdwood * struct regulator_map 40414c70cbSLiam Girdwood * 41414c70cbSLiam Girdwood * Used to provide symbolic supply names to devices. 42414c70cbSLiam Girdwood */ 43414c70cbSLiam Girdwood struct regulator_map { 44414c70cbSLiam Girdwood struct list_head list; 4540f9244fSMark Brown const char *dev_name; /* The dev_name() for the consumer */ 46414c70cbSLiam Girdwood const char *supply; 47a5766f11SLiam Girdwood struct regulator_dev *regulator; 48414c70cbSLiam Girdwood }; 49414c70cbSLiam Girdwood 50414c70cbSLiam Girdwood /* 51414c70cbSLiam Girdwood * struct regulator 52414c70cbSLiam Girdwood * 53414c70cbSLiam Girdwood * One for each consumer device. 54414c70cbSLiam Girdwood */ 55414c70cbSLiam Girdwood struct regulator { 56414c70cbSLiam Girdwood struct device *dev; 57414c70cbSLiam Girdwood struct list_head list; 58414c70cbSLiam Girdwood int uA_load; 59414c70cbSLiam Girdwood int min_uV; 60414c70cbSLiam Girdwood int max_uV; 61414c70cbSLiam Girdwood char *supply_name; 62414c70cbSLiam Girdwood struct device_attribute dev_attr; 63414c70cbSLiam Girdwood struct regulator_dev *rdev; 64414c70cbSLiam Girdwood }; 65414c70cbSLiam Girdwood 66414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev); 67414c70cbSLiam Girdwood static int _regulator_disable(struct regulator_dev *rdev); 68414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev); 69414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev); 70414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev); 71414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 72414c70cbSLiam Girdwood unsigned long event, void *data); 73414c70cbSLiam Girdwood 741083c393SMark Brown static const char *rdev_get_name(struct regulator_dev *rdev) 751083c393SMark Brown { 761083c393SMark Brown if (rdev->constraints && rdev->constraints->name) 771083c393SMark Brown return rdev->constraints->name; 781083c393SMark Brown else if (rdev->desc->name) 791083c393SMark Brown return rdev->desc->name; 801083c393SMark Brown else 811083c393SMark Brown return ""; 821083c393SMark Brown } 831083c393SMark Brown 84414c70cbSLiam Girdwood /* gets the regulator for a given consumer device */ 85414c70cbSLiam Girdwood static struct regulator *get_device_regulator(struct device *dev) 86414c70cbSLiam Girdwood { 87414c70cbSLiam Girdwood struct regulator *regulator = NULL; 88414c70cbSLiam Girdwood struct regulator_dev *rdev; 89414c70cbSLiam Girdwood 90414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 91414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 92414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 93414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) { 94414c70cbSLiam Girdwood if (regulator->dev == dev) { 95414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 96414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 97414c70cbSLiam Girdwood return regulator; 98414c70cbSLiam Girdwood } 99414c70cbSLiam Girdwood } 100414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 101414c70cbSLiam Girdwood } 102414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 103414c70cbSLiam Girdwood return NULL; 104414c70cbSLiam Girdwood } 105414c70cbSLiam Girdwood 106414c70cbSLiam Girdwood /* Platform voltage constraint check */ 107414c70cbSLiam Girdwood static int regulator_check_voltage(struct regulator_dev *rdev, 108414c70cbSLiam Girdwood int *min_uV, int *max_uV) 109414c70cbSLiam Girdwood { 110414c70cbSLiam Girdwood BUG_ON(*min_uV > *max_uV); 111414c70cbSLiam Girdwood 112414c70cbSLiam Girdwood if (!rdev->constraints) { 113414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1141083c393SMark Brown rdev_get_name(rdev)); 115414c70cbSLiam Girdwood return -ENODEV; 116414c70cbSLiam Girdwood } 117414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { 118414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1191083c393SMark Brown __func__, rdev_get_name(rdev)); 120414c70cbSLiam Girdwood return -EPERM; 121414c70cbSLiam Girdwood } 122414c70cbSLiam Girdwood 123414c70cbSLiam Girdwood if (*max_uV > rdev->constraints->max_uV) 124414c70cbSLiam Girdwood *max_uV = rdev->constraints->max_uV; 125414c70cbSLiam Girdwood if (*min_uV < rdev->constraints->min_uV) 126414c70cbSLiam Girdwood *min_uV = rdev->constraints->min_uV; 127414c70cbSLiam Girdwood 128414c70cbSLiam Girdwood if (*min_uV > *max_uV) 129414c70cbSLiam Girdwood return -EINVAL; 130414c70cbSLiam Girdwood 131414c70cbSLiam Girdwood return 0; 132414c70cbSLiam Girdwood } 133414c70cbSLiam Girdwood 134414c70cbSLiam Girdwood /* current constraint check */ 135414c70cbSLiam Girdwood static int regulator_check_current_limit(struct regulator_dev *rdev, 136414c70cbSLiam Girdwood int *min_uA, int *max_uA) 137414c70cbSLiam Girdwood { 138414c70cbSLiam Girdwood BUG_ON(*min_uA > *max_uA); 139414c70cbSLiam Girdwood 140414c70cbSLiam Girdwood if (!rdev->constraints) { 141414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1421083c393SMark Brown rdev_get_name(rdev)); 143414c70cbSLiam Girdwood return -ENODEV; 144414c70cbSLiam Girdwood } 145414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { 146414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1471083c393SMark Brown __func__, rdev_get_name(rdev)); 148414c70cbSLiam Girdwood return -EPERM; 149414c70cbSLiam Girdwood } 150414c70cbSLiam Girdwood 151414c70cbSLiam Girdwood if (*max_uA > rdev->constraints->max_uA) 152414c70cbSLiam Girdwood *max_uA = rdev->constraints->max_uA; 153414c70cbSLiam Girdwood if (*min_uA < rdev->constraints->min_uA) 154414c70cbSLiam Girdwood *min_uA = rdev->constraints->min_uA; 155414c70cbSLiam Girdwood 156414c70cbSLiam Girdwood if (*min_uA > *max_uA) 157414c70cbSLiam Girdwood return -EINVAL; 158414c70cbSLiam Girdwood 159414c70cbSLiam Girdwood return 0; 160414c70cbSLiam Girdwood } 161414c70cbSLiam Girdwood 162414c70cbSLiam Girdwood /* operating mode constraint check */ 163414c70cbSLiam Girdwood static int regulator_check_mode(struct regulator_dev *rdev, int mode) 164414c70cbSLiam Girdwood { 165e573520bSDavid Brownell switch (mode) { 166e573520bSDavid Brownell case REGULATOR_MODE_FAST: 167e573520bSDavid Brownell case REGULATOR_MODE_NORMAL: 168e573520bSDavid Brownell case REGULATOR_MODE_IDLE: 169e573520bSDavid Brownell case REGULATOR_MODE_STANDBY: 170e573520bSDavid Brownell break; 171e573520bSDavid Brownell default: 172e573520bSDavid Brownell return -EINVAL; 173e573520bSDavid Brownell } 174e573520bSDavid Brownell 175414c70cbSLiam Girdwood if (!rdev->constraints) { 176414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1771083c393SMark Brown rdev_get_name(rdev)); 178414c70cbSLiam Girdwood return -ENODEV; 179414c70cbSLiam Girdwood } 180414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { 181414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 1821083c393SMark Brown __func__, rdev_get_name(rdev)); 183414c70cbSLiam Girdwood return -EPERM; 184414c70cbSLiam Girdwood } 185414c70cbSLiam Girdwood if (!(rdev->constraints->valid_modes_mask & mode)) { 186414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid mode %x for %s\n", 1871083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 188414c70cbSLiam Girdwood return -EINVAL; 189414c70cbSLiam Girdwood } 190414c70cbSLiam Girdwood return 0; 191414c70cbSLiam Girdwood } 192414c70cbSLiam Girdwood 193414c70cbSLiam Girdwood /* dynamic regulator mode switching constraint check */ 194414c70cbSLiam Girdwood static int regulator_check_drms(struct regulator_dev *rdev) 195414c70cbSLiam Girdwood { 196414c70cbSLiam Girdwood if (!rdev->constraints) { 197414c70cbSLiam Girdwood printk(KERN_ERR "%s: no constraints for %s\n", __func__, 1981083c393SMark Brown rdev_get_name(rdev)); 199414c70cbSLiam Girdwood return -ENODEV; 200414c70cbSLiam Girdwood } 201414c70cbSLiam Girdwood if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { 202414c70cbSLiam Girdwood printk(KERN_ERR "%s: operation not allowed for %s\n", 2031083c393SMark Brown __func__, rdev_get_name(rdev)); 204414c70cbSLiam Girdwood return -EPERM; 205414c70cbSLiam Girdwood } 206414c70cbSLiam Girdwood return 0; 207414c70cbSLiam Girdwood } 208414c70cbSLiam Girdwood 209414c70cbSLiam Girdwood static ssize_t device_requested_uA_show(struct device *dev, 210414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 211414c70cbSLiam Girdwood { 212414c70cbSLiam Girdwood struct regulator *regulator; 213414c70cbSLiam Girdwood 214414c70cbSLiam Girdwood regulator = get_device_regulator(dev); 215414c70cbSLiam Girdwood if (regulator == NULL) 216414c70cbSLiam Girdwood return 0; 217414c70cbSLiam Girdwood 218414c70cbSLiam Girdwood return sprintf(buf, "%d\n", regulator->uA_load); 219414c70cbSLiam Girdwood } 220414c70cbSLiam Girdwood 221414c70cbSLiam Girdwood static ssize_t regulator_uV_show(struct device *dev, 222414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 223414c70cbSLiam Girdwood { 224a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 225414c70cbSLiam Girdwood ssize_t ret; 226414c70cbSLiam Girdwood 227414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 228414c70cbSLiam Girdwood ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); 229414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 230414c70cbSLiam Girdwood 231414c70cbSLiam Girdwood return ret; 232414c70cbSLiam Girdwood } 2337ad68e2fSDavid Brownell static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); 234414c70cbSLiam Girdwood 235414c70cbSLiam Girdwood static ssize_t regulator_uA_show(struct device *dev, 236414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 237414c70cbSLiam Girdwood { 238a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 239414c70cbSLiam Girdwood 240414c70cbSLiam Girdwood return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); 241414c70cbSLiam Girdwood } 2427ad68e2fSDavid Brownell static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); 243414c70cbSLiam Girdwood 244bc558a60SMark Brown static ssize_t regulator_name_show(struct device *dev, 245bc558a60SMark Brown struct device_attribute *attr, char *buf) 246bc558a60SMark Brown { 247bc558a60SMark Brown struct regulator_dev *rdev = dev_get_drvdata(dev); 248bc558a60SMark Brown 2491083c393SMark Brown return sprintf(buf, "%s\n", rdev_get_name(rdev)); 250bc558a60SMark Brown } 251bc558a60SMark Brown 2524fca9545SDavid Brownell static ssize_t regulator_print_opmode(char *buf, int mode) 253414c70cbSLiam Girdwood { 254414c70cbSLiam Girdwood switch (mode) { 255414c70cbSLiam Girdwood case REGULATOR_MODE_FAST: 256414c70cbSLiam Girdwood return sprintf(buf, "fast\n"); 257414c70cbSLiam Girdwood case REGULATOR_MODE_NORMAL: 258414c70cbSLiam Girdwood return sprintf(buf, "normal\n"); 259414c70cbSLiam Girdwood case REGULATOR_MODE_IDLE: 260414c70cbSLiam Girdwood return sprintf(buf, "idle\n"); 261414c70cbSLiam Girdwood case REGULATOR_MODE_STANDBY: 262414c70cbSLiam Girdwood return sprintf(buf, "standby\n"); 263414c70cbSLiam Girdwood } 264414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 265414c70cbSLiam Girdwood } 266414c70cbSLiam Girdwood 2674fca9545SDavid Brownell static ssize_t regulator_opmode_show(struct device *dev, 268414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 269414c70cbSLiam Girdwood { 270a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 271414c70cbSLiam Girdwood 2724fca9545SDavid Brownell return regulator_print_opmode(buf, _regulator_get_mode(rdev)); 2734fca9545SDavid Brownell } 2747ad68e2fSDavid Brownell static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); 2754fca9545SDavid Brownell 2764fca9545SDavid Brownell static ssize_t regulator_print_state(char *buf, int state) 2774fca9545SDavid Brownell { 278414c70cbSLiam Girdwood if (state > 0) 279414c70cbSLiam Girdwood return sprintf(buf, "enabled\n"); 280414c70cbSLiam Girdwood else if (state == 0) 281414c70cbSLiam Girdwood return sprintf(buf, "disabled\n"); 282414c70cbSLiam Girdwood else 283414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 284414c70cbSLiam Girdwood } 285414c70cbSLiam Girdwood 2864fca9545SDavid Brownell static ssize_t regulator_state_show(struct device *dev, 2874fca9545SDavid Brownell struct device_attribute *attr, char *buf) 2884fca9545SDavid Brownell { 2894fca9545SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 2909332546fSMark Brown ssize_t ret; 2914fca9545SDavid Brownell 2929332546fSMark Brown mutex_lock(&rdev->mutex); 2939332546fSMark Brown ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); 2949332546fSMark Brown mutex_unlock(&rdev->mutex); 2959332546fSMark Brown 2969332546fSMark Brown return ret; 2974fca9545SDavid Brownell } 2987ad68e2fSDavid Brownell static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); 2994fca9545SDavid Brownell 300853116a1SDavid Brownell static ssize_t regulator_status_show(struct device *dev, 301853116a1SDavid Brownell struct device_attribute *attr, char *buf) 302853116a1SDavid Brownell { 303853116a1SDavid Brownell struct regulator_dev *rdev = dev_get_drvdata(dev); 304853116a1SDavid Brownell int status; 305853116a1SDavid Brownell char *label; 306853116a1SDavid Brownell 307853116a1SDavid Brownell status = rdev->desc->ops->get_status(rdev); 308853116a1SDavid Brownell if (status < 0) 309853116a1SDavid Brownell return status; 310853116a1SDavid Brownell 311853116a1SDavid Brownell switch (status) { 312853116a1SDavid Brownell case REGULATOR_STATUS_OFF: 313853116a1SDavid Brownell label = "off"; 314853116a1SDavid Brownell break; 315853116a1SDavid Brownell case REGULATOR_STATUS_ON: 316853116a1SDavid Brownell label = "on"; 317853116a1SDavid Brownell break; 318853116a1SDavid Brownell case REGULATOR_STATUS_ERROR: 319853116a1SDavid Brownell label = "error"; 320853116a1SDavid Brownell break; 321853116a1SDavid Brownell case REGULATOR_STATUS_FAST: 322853116a1SDavid Brownell label = "fast"; 323853116a1SDavid Brownell break; 324853116a1SDavid Brownell case REGULATOR_STATUS_NORMAL: 325853116a1SDavid Brownell label = "normal"; 326853116a1SDavid Brownell break; 327853116a1SDavid Brownell case REGULATOR_STATUS_IDLE: 328853116a1SDavid Brownell label = "idle"; 329853116a1SDavid Brownell break; 330853116a1SDavid Brownell case REGULATOR_STATUS_STANDBY: 331853116a1SDavid Brownell label = "standby"; 332853116a1SDavid Brownell break; 333853116a1SDavid Brownell default: 334853116a1SDavid Brownell return -ERANGE; 335853116a1SDavid Brownell } 336853116a1SDavid Brownell 337853116a1SDavid Brownell return sprintf(buf, "%s\n", label); 338853116a1SDavid Brownell } 339853116a1SDavid Brownell static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); 340853116a1SDavid Brownell 341414c70cbSLiam Girdwood static ssize_t regulator_min_uA_show(struct device *dev, 342414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 343414c70cbSLiam Girdwood { 344a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 345414c70cbSLiam Girdwood 346414c70cbSLiam Girdwood if (!rdev->constraints) 347414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 348414c70cbSLiam Girdwood 349414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uA); 350414c70cbSLiam Girdwood } 3517ad68e2fSDavid Brownell static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); 352414c70cbSLiam Girdwood 353414c70cbSLiam Girdwood static ssize_t regulator_max_uA_show(struct device *dev, 354414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 355414c70cbSLiam Girdwood { 356a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 357414c70cbSLiam Girdwood 358414c70cbSLiam Girdwood if (!rdev->constraints) 359414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 360414c70cbSLiam Girdwood 361414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uA); 362414c70cbSLiam Girdwood } 3637ad68e2fSDavid Brownell static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); 364414c70cbSLiam Girdwood 365414c70cbSLiam Girdwood static ssize_t regulator_min_uV_show(struct device *dev, 366414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 367414c70cbSLiam Girdwood { 368a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 369414c70cbSLiam Girdwood 370414c70cbSLiam Girdwood if (!rdev->constraints) 371414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 372414c70cbSLiam Girdwood 373414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->min_uV); 374414c70cbSLiam Girdwood } 3757ad68e2fSDavid Brownell static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); 376414c70cbSLiam Girdwood 377414c70cbSLiam Girdwood static ssize_t regulator_max_uV_show(struct device *dev, 378414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 379414c70cbSLiam Girdwood { 380a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 381414c70cbSLiam Girdwood 382414c70cbSLiam Girdwood if (!rdev->constraints) 383414c70cbSLiam Girdwood return sprintf(buf, "constraint not defined\n"); 384414c70cbSLiam Girdwood 385414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->max_uV); 386414c70cbSLiam Girdwood } 3877ad68e2fSDavid Brownell static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); 388414c70cbSLiam Girdwood 389414c70cbSLiam Girdwood static ssize_t regulator_total_uA_show(struct device *dev, 390414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 391414c70cbSLiam Girdwood { 392a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 393414c70cbSLiam Girdwood struct regulator *regulator; 394414c70cbSLiam Girdwood int uA = 0; 395414c70cbSLiam Girdwood 396414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 397414c70cbSLiam Girdwood list_for_each_entry(regulator, &rdev->consumer_list, list) 398414c70cbSLiam Girdwood uA += regulator->uA_load; 399414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 400414c70cbSLiam Girdwood return sprintf(buf, "%d\n", uA); 401414c70cbSLiam Girdwood } 4027ad68e2fSDavid Brownell static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); 403414c70cbSLiam Girdwood 404414c70cbSLiam Girdwood static ssize_t regulator_num_users_show(struct device *dev, 405414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 406414c70cbSLiam Girdwood { 407a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 408414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->use_count); 409414c70cbSLiam Girdwood } 410414c70cbSLiam Girdwood 411414c70cbSLiam Girdwood static ssize_t regulator_type_show(struct device *dev, 412414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 413414c70cbSLiam Girdwood { 414a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 415414c70cbSLiam Girdwood 416414c70cbSLiam Girdwood switch (rdev->desc->type) { 417414c70cbSLiam Girdwood case REGULATOR_VOLTAGE: 418414c70cbSLiam Girdwood return sprintf(buf, "voltage\n"); 419414c70cbSLiam Girdwood case REGULATOR_CURRENT: 420414c70cbSLiam Girdwood return sprintf(buf, "current\n"); 421414c70cbSLiam Girdwood } 422414c70cbSLiam Girdwood return sprintf(buf, "unknown\n"); 423414c70cbSLiam Girdwood } 424414c70cbSLiam Girdwood 425414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_uV_show(struct device *dev, 426414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 427414c70cbSLiam Girdwood { 428a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 429414c70cbSLiam Girdwood 430414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); 431414c70cbSLiam Girdwood } 4327ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_microvolts, 0444, 4337ad68e2fSDavid Brownell regulator_suspend_mem_uV_show, NULL); 434414c70cbSLiam Girdwood 435414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_uV_show(struct device *dev, 436414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 437414c70cbSLiam Girdwood { 438a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 439414c70cbSLiam Girdwood 440414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); 441414c70cbSLiam Girdwood } 4427ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_microvolts, 0444, 4437ad68e2fSDavid Brownell regulator_suspend_disk_uV_show, NULL); 444414c70cbSLiam Girdwood 445414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_uV_show(struct device *dev, 446414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 447414c70cbSLiam Girdwood { 448a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 449414c70cbSLiam Girdwood 450414c70cbSLiam Girdwood return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); 451414c70cbSLiam Girdwood } 4527ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_microvolts, 0444, 4537ad68e2fSDavid Brownell regulator_suspend_standby_uV_show, NULL); 454414c70cbSLiam Girdwood 455414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_mode_show(struct device *dev, 456414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 457414c70cbSLiam Girdwood { 458a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 459414c70cbSLiam Girdwood 4604fca9545SDavid Brownell return regulator_print_opmode(buf, 4614fca9545SDavid Brownell rdev->constraints->state_mem.mode); 462414c70cbSLiam Girdwood } 4637ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_mode, 0444, 4647ad68e2fSDavid Brownell regulator_suspend_mem_mode_show, NULL); 465414c70cbSLiam Girdwood 466414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_mode_show(struct device *dev, 467414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 468414c70cbSLiam Girdwood { 469a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 470414c70cbSLiam Girdwood 4714fca9545SDavid Brownell return regulator_print_opmode(buf, 4724fca9545SDavid Brownell rdev->constraints->state_disk.mode); 473414c70cbSLiam Girdwood } 4747ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_mode, 0444, 4757ad68e2fSDavid Brownell regulator_suspend_disk_mode_show, NULL); 476414c70cbSLiam Girdwood 477414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_mode_show(struct device *dev, 478414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 479414c70cbSLiam Girdwood { 480a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 481414c70cbSLiam Girdwood 4824fca9545SDavid Brownell return regulator_print_opmode(buf, 4834fca9545SDavid Brownell rdev->constraints->state_standby.mode); 484414c70cbSLiam Girdwood } 4857ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_mode, 0444, 4867ad68e2fSDavid Brownell regulator_suspend_standby_mode_show, NULL); 487414c70cbSLiam Girdwood 488414c70cbSLiam Girdwood static ssize_t regulator_suspend_mem_state_show(struct device *dev, 489414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 490414c70cbSLiam Girdwood { 491a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 492414c70cbSLiam Girdwood 4934fca9545SDavid Brownell return regulator_print_state(buf, 4944fca9545SDavid Brownell rdev->constraints->state_mem.enabled); 495414c70cbSLiam Girdwood } 4967ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_mem_state, 0444, 4977ad68e2fSDavid Brownell regulator_suspend_mem_state_show, NULL); 498414c70cbSLiam Girdwood 499414c70cbSLiam Girdwood static ssize_t regulator_suspend_disk_state_show(struct device *dev, 500414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 501414c70cbSLiam Girdwood { 502a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 503414c70cbSLiam Girdwood 5044fca9545SDavid Brownell return regulator_print_state(buf, 5054fca9545SDavid Brownell rdev->constraints->state_disk.enabled); 506414c70cbSLiam Girdwood } 5077ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_disk_state, 0444, 5087ad68e2fSDavid Brownell regulator_suspend_disk_state_show, NULL); 509414c70cbSLiam Girdwood 510414c70cbSLiam Girdwood static ssize_t regulator_suspend_standby_state_show(struct device *dev, 511414c70cbSLiam Girdwood struct device_attribute *attr, char *buf) 512414c70cbSLiam Girdwood { 513a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 514414c70cbSLiam Girdwood 5154fca9545SDavid Brownell return regulator_print_state(buf, 5164fca9545SDavid Brownell rdev->constraints->state_standby.enabled); 517414c70cbSLiam Girdwood } 5187ad68e2fSDavid Brownell static DEVICE_ATTR(suspend_standby_state, 0444, 5197ad68e2fSDavid Brownell regulator_suspend_standby_state_show, NULL); 520bc558a60SMark Brown 5217ad68e2fSDavid Brownell 5227ad68e2fSDavid Brownell /* 5237ad68e2fSDavid Brownell * These are the only attributes are present for all regulators. 5247ad68e2fSDavid Brownell * Other attributes are a function of regulator functionality. 5257ad68e2fSDavid Brownell */ 526414c70cbSLiam Girdwood static struct device_attribute regulator_dev_attrs[] = { 527bc558a60SMark Brown __ATTR(name, 0444, regulator_name_show, NULL), 528414c70cbSLiam Girdwood __ATTR(num_users, 0444, regulator_num_users_show, NULL), 529414c70cbSLiam Girdwood __ATTR(type, 0444, regulator_type_show, NULL), 530414c70cbSLiam Girdwood __ATTR_NULL, 531414c70cbSLiam Girdwood }; 532414c70cbSLiam Girdwood 533414c70cbSLiam Girdwood static void regulator_dev_release(struct device *dev) 534414c70cbSLiam Girdwood { 535a5766f11SLiam Girdwood struct regulator_dev *rdev = dev_get_drvdata(dev); 536414c70cbSLiam Girdwood kfree(rdev); 537414c70cbSLiam Girdwood } 538414c70cbSLiam Girdwood 539414c70cbSLiam Girdwood static struct class regulator_class = { 540414c70cbSLiam Girdwood .name = "regulator", 541414c70cbSLiam Girdwood .dev_release = regulator_dev_release, 542414c70cbSLiam Girdwood .dev_attrs = regulator_dev_attrs, 543414c70cbSLiam Girdwood }; 544414c70cbSLiam Girdwood 545414c70cbSLiam Girdwood /* Calculate the new optimum regulator operating mode based on the new total 546414c70cbSLiam Girdwood * consumer load. All locks held by caller */ 547414c70cbSLiam Girdwood static void drms_uA_update(struct regulator_dev *rdev) 548414c70cbSLiam Girdwood { 549414c70cbSLiam Girdwood struct regulator *sibling; 550414c70cbSLiam Girdwood int current_uA = 0, output_uV, input_uV, err; 551414c70cbSLiam Girdwood unsigned int mode; 552414c70cbSLiam Girdwood 553414c70cbSLiam Girdwood err = regulator_check_drms(rdev); 554414c70cbSLiam Girdwood if (err < 0 || !rdev->desc->ops->get_optimum_mode || 555036de8efSDan Carpenter !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode) 556414c70cbSLiam Girdwood return; 557414c70cbSLiam Girdwood 558414c70cbSLiam Girdwood /* get output voltage */ 559414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 560414c70cbSLiam Girdwood if (output_uV <= 0) 561414c70cbSLiam Girdwood return; 562414c70cbSLiam Girdwood 563414c70cbSLiam Girdwood /* get input voltage */ 564414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 565414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 566414c70cbSLiam Girdwood else 567414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 568414c70cbSLiam Girdwood if (input_uV <= 0) 569414c70cbSLiam Girdwood return; 570414c70cbSLiam Girdwood 571414c70cbSLiam Girdwood /* calc total requested load */ 572414c70cbSLiam Girdwood list_for_each_entry(sibling, &rdev->consumer_list, list) 573414c70cbSLiam Girdwood current_uA += sibling->uA_load; 574414c70cbSLiam Girdwood 575414c70cbSLiam Girdwood /* now get the optimum mode for our new total regulator load */ 576414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, 577414c70cbSLiam Girdwood output_uV, current_uA); 578414c70cbSLiam Girdwood 579414c70cbSLiam Girdwood /* check the new mode is allowed */ 580414c70cbSLiam Girdwood err = regulator_check_mode(rdev, mode); 581414c70cbSLiam Girdwood if (err == 0) 582414c70cbSLiam Girdwood rdev->desc->ops->set_mode(rdev, mode); 583414c70cbSLiam Girdwood } 584414c70cbSLiam Girdwood 585414c70cbSLiam Girdwood static int suspend_set_state(struct regulator_dev *rdev, 586414c70cbSLiam Girdwood struct regulator_state *rstate) 587414c70cbSLiam Girdwood { 588414c70cbSLiam Girdwood int ret = 0; 589638f85c5SMark Brown bool can_set_state; 590414c70cbSLiam Girdwood 591638f85c5SMark Brown can_set_state = rdev->desc->ops->set_suspend_enable && 592638f85c5SMark Brown rdev->desc->ops->set_suspend_disable; 593638f85c5SMark Brown 594638f85c5SMark Brown /* If we have no suspend mode configration don't set anything; 595638f85c5SMark Brown * only warn if the driver actually makes the suspend mode 596638f85c5SMark Brown * configurable. 597638f85c5SMark Brown */ 598638f85c5SMark Brown if (!rstate->enabled && !rstate->disabled) { 599638f85c5SMark Brown if (can_set_state) 600638f85c5SMark Brown printk(KERN_WARNING "%s: No configuration for %s\n", 601638f85c5SMark Brown __func__, rdev_get_name(rdev)); 602638f85c5SMark Brown return 0; 603638f85c5SMark Brown } 604638f85c5SMark Brown 605638f85c5SMark Brown if (rstate->enabled && rstate->disabled) { 606638f85c5SMark Brown printk(KERN_ERR "%s: invalid configuration for %s\n", 607638f85c5SMark Brown __func__, rdev_get_name(rdev)); 608638f85c5SMark Brown return -EINVAL; 609638f85c5SMark Brown } 610638f85c5SMark Brown 611638f85c5SMark Brown if (!can_set_state) { 612a5766f11SLiam Girdwood printk(KERN_ERR "%s: no way to set suspend state\n", 613a5766f11SLiam Girdwood __func__); 614414c70cbSLiam Girdwood return -EINVAL; 615a5766f11SLiam Girdwood } 616414c70cbSLiam Girdwood 617414c70cbSLiam Girdwood if (rstate->enabled) 618414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_enable(rdev); 619414c70cbSLiam Girdwood else 620414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_disable(rdev); 621414c70cbSLiam Girdwood if (ret < 0) { 622414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enabled/disable\n", __func__); 623414c70cbSLiam Girdwood return ret; 624414c70cbSLiam Girdwood } 625414c70cbSLiam Girdwood 626414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { 627414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); 628414c70cbSLiam Girdwood if (ret < 0) { 629414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set voltage\n", 630414c70cbSLiam Girdwood __func__); 631414c70cbSLiam Girdwood return ret; 632414c70cbSLiam Girdwood } 633414c70cbSLiam Girdwood } 634414c70cbSLiam Girdwood 635414c70cbSLiam Girdwood if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { 636414c70cbSLiam Girdwood ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); 637414c70cbSLiam Girdwood if (ret < 0) { 638414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set mode\n", __func__); 639414c70cbSLiam Girdwood return ret; 640414c70cbSLiam Girdwood } 641414c70cbSLiam Girdwood } 642414c70cbSLiam Girdwood return ret; 643414c70cbSLiam Girdwood } 644414c70cbSLiam Girdwood 645414c70cbSLiam Girdwood /* locks held by caller */ 646414c70cbSLiam Girdwood static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) 647414c70cbSLiam Girdwood { 648414c70cbSLiam Girdwood if (!rdev->constraints) 649414c70cbSLiam Girdwood return -EINVAL; 650414c70cbSLiam Girdwood 651414c70cbSLiam Girdwood switch (state) { 652414c70cbSLiam Girdwood case PM_SUSPEND_STANDBY: 653414c70cbSLiam Girdwood return suspend_set_state(rdev, 654414c70cbSLiam Girdwood &rdev->constraints->state_standby); 655414c70cbSLiam Girdwood case PM_SUSPEND_MEM: 656414c70cbSLiam Girdwood return suspend_set_state(rdev, 657414c70cbSLiam Girdwood &rdev->constraints->state_mem); 658414c70cbSLiam Girdwood case PM_SUSPEND_MAX: 659414c70cbSLiam Girdwood return suspend_set_state(rdev, 660414c70cbSLiam Girdwood &rdev->constraints->state_disk); 661414c70cbSLiam Girdwood default: 662414c70cbSLiam Girdwood return -EINVAL; 663414c70cbSLiam Girdwood } 664414c70cbSLiam Girdwood } 665414c70cbSLiam Girdwood 666414c70cbSLiam Girdwood static void print_constraints(struct regulator_dev *rdev) 667414c70cbSLiam Girdwood { 668414c70cbSLiam Girdwood struct regulation_constraints *constraints = rdev->constraints; 669973e9a27SMark Brown char buf[80] = ""; 6708f031b48SMark Brown int count = 0; 6718f031b48SMark Brown int ret; 672414c70cbSLiam Girdwood 6738f031b48SMark Brown if (constraints->min_uV && constraints->max_uV) { 674414c70cbSLiam Girdwood if (constraints->min_uV == constraints->max_uV) 6758f031b48SMark Brown count += sprintf(buf + count, "%d mV ", 676414c70cbSLiam Girdwood constraints->min_uV / 1000); 677414c70cbSLiam Girdwood else 6788f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mV ", 679414c70cbSLiam Girdwood constraints->min_uV / 1000, 680414c70cbSLiam Girdwood constraints->max_uV / 1000); 6818f031b48SMark Brown } 6828f031b48SMark Brown 6838f031b48SMark Brown if (!constraints->min_uV || 6848f031b48SMark Brown constraints->min_uV != constraints->max_uV) { 6858f031b48SMark Brown ret = _regulator_get_voltage(rdev); 6868f031b48SMark Brown if (ret > 0) 6878f031b48SMark Brown count += sprintf(buf + count, "at %d mV ", ret / 1000); 6888f031b48SMark Brown } 6898f031b48SMark Brown 6908f031b48SMark Brown if (constraints->min_uA && constraints->max_uA) { 691414c70cbSLiam Girdwood if (constraints->min_uA == constraints->max_uA) 6928f031b48SMark Brown count += sprintf(buf + count, "%d mA ", 693414c70cbSLiam Girdwood constraints->min_uA / 1000); 694414c70cbSLiam Girdwood else 6958f031b48SMark Brown count += sprintf(buf + count, "%d <--> %d mA ", 696414c70cbSLiam Girdwood constraints->min_uA / 1000, 697414c70cbSLiam Girdwood constraints->max_uA / 1000); 698414c70cbSLiam Girdwood } 6998f031b48SMark Brown 7008f031b48SMark Brown if (!constraints->min_uA || 7018f031b48SMark Brown constraints->min_uA != constraints->max_uA) { 7028f031b48SMark Brown ret = _regulator_get_current_limit(rdev); 7038f031b48SMark Brown if (ret > 0) 704e4a6376bSCyril Chemparathy count += sprintf(buf + count, "at %d mA ", ret / 1000); 7058f031b48SMark Brown } 7068f031b48SMark Brown 707414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) 708414c70cbSLiam Girdwood count += sprintf(buf + count, "fast "); 709414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) 710414c70cbSLiam Girdwood count += sprintf(buf + count, "normal "); 711414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) 712414c70cbSLiam Girdwood count += sprintf(buf + count, "idle "); 713414c70cbSLiam Girdwood if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) 714414c70cbSLiam Girdwood count += sprintf(buf + count, "standby"); 715414c70cbSLiam Girdwood 7161083c393SMark Brown printk(KERN_INFO "regulator: %s: %s\n", rdev_get_name(rdev), buf); 717414c70cbSLiam Girdwood } 718414c70cbSLiam Girdwood 719e79055d6SMark Brown static int machine_constraints_voltage(struct regulator_dev *rdev, 7201083c393SMark Brown struct regulation_constraints *constraints) 721e79055d6SMark Brown { 722e79055d6SMark Brown struct regulator_ops *ops = rdev->desc->ops; 7231083c393SMark Brown const char *name = rdev_get_name(rdev); 724af5866c9SMark Brown int ret; 725af5866c9SMark Brown 726af5866c9SMark Brown /* do we need to apply the constraint voltage */ 727af5866c9SMark Brown if (rdev->constraints->apply_uV && 728af5866c9SMark Brown rdev->constraints->min_uV == rdev->constraints->max_uV && 729af5866c9SMark Brown ops->set_voltage) { 730af5866c9SMark Brown ret = ops->set_voltage(rdev, 731af5866c9SMark Brown rdev->constraints->min_uV, rdev->constraints->max_uV); 732af5866c9SMark Brown if (ret < 0) { 733af5866c9SMark Brown printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n", 734af5866c9SMark Brown __func__, 735af5866c9SMark Brown rdev->constraints->min_uV, name); 736af5866c9SMark Brown rdev->constraints = NULL; 737af5866c9SMark Brown return ret; 738af5866c9SMark Brown } 739af5866c9SMark Brown } 740e79055d6SMark Brown 741e79055d6SMark Brown /* constrain machine-level voltage specs to fit 742e79055d6SMark Brown * the actual range supported by this regulator. 743e79055d6SMark Brown */ 744e79055d6SMark Brown if (ops->list_voltage && rdev->desc->n_voltages) { 745e79055d6SMark Brown int count = rdev->desc->n_voltages; 746e79055d6SMark Brown int i; 747e79055d6SMark Brown int min_uV = INT_MAX; 748e79055d6SMark Brown int max_uV = INT_MIN; 749e79055d6SMark Brown int cmin = constraints->min_uV; 750e79055d6SMark Brown int cmax = constraints->max_uV; 751e79055d6SMark Brown 752e79055d6SMark Brown /* it's safe to autoconfigure fixed-voltage supplies 753e79055d6SMark Brown and the constraints are used by list_voltage. */ 754e79055d6SMark Brown if (count == 1 && !cmin) { 755e79055d6SMark Brown cmin = 1; 756e79055d6SMark Brown cmax = INT_MAX; 757e79055d6SMark Brown constraints->min_uV = cmin; 758e79055d6SMark Brown constraints->max_uV = cmax; 759e79055d6SMark Brown } 760e79055d6SMark Brown 761e79055d6SMark Brown /* voltage constraints are optional */ 762e79055d6SMark Brown if ((cmin == 0) && (cmax == 0)) 763e79055d6SMark Brown return 0; 764e79055d6SMark Brown 765e79055d6SMark Brown /* else require explicit machine-level constraints */ 766e79055d6SMark Brown if (cmin <= 0 || cmax <= 0 || cmax < cmin) { 767e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 768e79055d6SMark Brown __func__, "invalid", name); 769e79055d6SMark Brown return -EINVAL; 770e79055d6SMark Brown } 771e79055d6SMark Brown 772e79055d6SMark Brown /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ 773e79055d6SMark Brown for (i = 0; i < count; i++) { 774e79055d6SMark Brown int value; 775e79055d6SMark Brown 776e79055d6SMark Brown value = ops->list_voltage(rdev, i); 777e79055d6SMark Brown if (value <= 0) 778e79055d6SMark Brown continue; 779e79055d6SMark Brown 780e79055d6SMark Brown /* maybe adjust [min_uV..max_uV] */ 781e79055d6SMark Brown if (value >= cmin && value < min_uV) 782e79055d6SMark Brown min_uV = value; 783e79055d6SMark Brown if (value <= cmax && value > max_uV) 784e79055d6SMark Brown max_uV = value; 785e79055d6SMark Brown } 786e79055d6SMark Brown 787e79055d6SMark Brown /* final: [min_uV..max_uV] valid iff constraints valid */ 788e79055d6SMark Brown if (max_uV < min_uV) { 789e79055d6SMark Brown pr_err("%s: %s '%s' voltage constraints\n", 790e79055d6SMark Brown __func__, "unsupportable", name); 791e79055d6SMark Brown return -EINVAL; 792e79055d6SMark Brown } 793e79055d6SMark Brown 794e79055d6SMark Brown /* use regulator's subset of machine constraints */ 795e79055d6SMark Brown if (constraints->min_uV < min_uV) { 796e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 797e79055d6SMark Brown __func__, name, "min_uV", 798e79055d6SMark Brown constraints->min_uV, min_uV); 799e79055d6SMark Brown constraints->min_uV = min_uV; 800e79055d6SMark Brown } 801e79055d6SMark Brown if (constraints->max_uV > max_uV) { 802e79055d6SMark Brown pr_debug("%s: override '%s' %s, %d -> %d\n", 803e79055d6SMark Brown __func__, name, "max_uV", 804e79055d6SMark Brown constraints->max_uV, max_uV); 805e79055d6SMark Brown constraints->max_uV = max_uV; 806e79055d6SMark Brown } 807e79055d6SMark Brown } 808e79055d6SMark Brown 809e79055d6SMark Brown return 0; 810e79055d6SMark Brown } 811e79055d6SMark Brown 812a5766f11SLiam Girdwood /** 813a5766f11SLiam Girdwood * set_machine_constraints - sets regulator constraints 81469279fb9SMark Brown * @rdev: regulator source 815c8e7e464SMark Brown * @constraints: constraints to apply 816a5766f11SLiam Girdwood * 817a5766f11SLiam Girdwood * Allows platform initialisation code to define and constrain 818a5766f11SLiam Girdwood * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: 819a5766f11SLiam Girdwood * Constraints *must* be set by platform code in order for some 820a5766f11SLiam Girdwood * regulator operations to proceed i.e. set_voltage, set_current_limit, 821a5766f11SLiam Girdwood * set_mode. 822a5766f11SLiam Girdwood */ 823a5766f11SLiam Girdwood static int set_machine_constraints(struct regulator_dev *rdev, 824a5766f11SLiam Girdwood struct regulation_constraints *constraints) 825a5766f11SLiam Girdwood { 826a5766f11SLiam Girdwood int ret = 0; 827e06f5b4fSMark Brown const char *name; 828e5fda26cSMark Brown struct regulator_ops *ops = rdev->desc->ops; 829e06f5b4fSMark Brown 830af5866c9SMark Brown rdev->constraints = constraints; 831af5866c9SMark Brown 8321083c393SMark Brown name = rdev_get_name(rdev); 8331083c393SMark Brown 8341083c393SMark Brown ret = machine_constraints_voltage(rdev, constraints); 835e79055d6SMark Brown if (ret != 0) 8363e2b9abdSMark Brown goto out; 8373e2b9abdSMark Brown 838a5766f11SLiam Girdwood /* do we need to setup our suspend state */ 839e06f5b4fSMark Brown if (constraints->initial_state) { 840a5766f11SLiam Girdwood ret = suspend_prepare(rdev, constraints->initial_state); 841e06f5b4fSMark Brown if (ret < 0) { 842e06f5b4fSMark Brown printk(KERN_ERR "%s: failed to set suspend state for %s\n", 843e06f5b4fSMark Brown __func__, name); 844e06f5b4fSMark Brown rdev->constraints = NULL; 845e06f5b4fSMark Brown goto out; 846e06f5b4fSMark Brown } 847e06f5b4fSMark Brown } 848a5766f11SLiam Girdwood 849a308466cSMark Brown if (constraints->initial_mode) { 850a308466cSMark Brown if (!ops->set_mode) { 851a308466cSMark Brown printk(KERN_ERR "%s: no set_mode operation for %s\n", 852a308466cSMark Brown __func__, name); 853a308466cSMark Brown ret = -EINVAL; 854a308466cSMark Brown goto out; 855a308466cSMark Brown } 856a308466cSMark Brown 857a308466cSMark Brown ret = ops->set_mode(rdev, constraints->initial_mode); 858a308466cSMark Brown if (ret < 0) { 859a308466cSMark Brown printk(KERN_ERR 860a308466cSMark Brown "%s: failed to set initial mode for %s: %d\n", 861a308466cSMark Brown __func__, name, ret); 862a308466cSMark Brown goto out; 863a308466cSMark Brown } 864a308466cSMark Brown } 865a308466cSMark Brown 866cacf90f2SMark Brown /* If the constraints say the regulator should be on at this point 867cacf90f2SMark Brown * and we have control then make sure it is enabled. 868cacf90f2SMark Brown */ 869cacf90f2SMark Brown if ((constraints->always_on || constraints->boot_on) && ops->enable) { 870e5fda26cSMark Brown ret = ops->enable(rdev); 871e5fda26cSMark Brown if (ret < 0) { 872e5fda26cSMark Brown printk(KERN_ERR "%s: failed to enable %s\n", 873e5fda26cSMark Brown __func__, name); 874e5fda26cSMark Brown rdev->constraints = NULL; 875e5fda26cSMark Brown goto out; 876e5fda26cSMark Brown } 877e5fda26cSMark Brown } 878e5fda26cSMark Brown 879a5766f11SLiam Girdwood print_constraints(rdev); 880a5766f11SLiam Girdwood out: 881a5766f11SLiam Girdwood return ret; 882a5766f11SLiam Girdwood } 883a5766f11SLiam Girdwood 884a5766f11SLiam Girdwood /** 885a5766f11SLiam Girdwood * set_supply - set regulator supply regulator 88669279fb9SMark Brown * @rdev: regulator name 88769279fb9SMark Brown * @supply_rdev: supply regulator name 888a5766f11SLiam Girdwood * 889a5766f11SLiam Girdwood * Called by platform initialisation code to set the supply regulator for this 890a5766f11SLiam Girdwood * regulator. This ensures that a regulators supply will also be enabled by the 891a5766f11SLiam Girdwood * core if it's child is enabled. 892a5766f11SLiam Girdwood */ 893a5766f11SLiam Girdwood static int set_supply(struct regulator_dev *rdev, 894a5766f11SLiam Girdwood struct regulator_dev *supply_rdev) 895a5766f11SLiam Girdwood { 896a5766f11SLiam Girdwood int err; 897a5766f11SLiam Girdwood 898a5766f11SLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, 899a5766f11SLiam Girdwood "supply"); 900a5766f11SLiam Girdwood if (err) { 901a5766f11SLiam Girdwood printk(KERN_ERR 902a5766f11SLiam Girdwood "%s: could not add device link %s err %d\n", 903a5766f11SLiam Girdwood __func__, supply_rdev->dev.kobj.name, err); 904a5766f11SLiam Girdwood goto out; 905a5766f11SLiam Girdwood } 906a5766f11SLiam Girdwood rdev->supply = supply_rdev; 907a5766f11SLiam Girdwood list_add(&rdev->slist, &supply_rdev->supply_list); 908a5766f11SLiam Girdwood out: 909a5766f11SLiam Girdwood return err; 910a5766f11SLiam Girdwood } 911a5766f11SLiam Girdwood 912a5766f11SLiam Girdwood /** 913a5766f11SLiam Girdwood * set_consumer_device_supply: Bind a regulator to a symbolic supply 91469279fb9SMark Brown * @rdev: regulator source 91569279fb9SMark Brown * @consumer_dev: device the supply applies to 91640f9244fSMark Brown * @consumer_dev_name: dev_name() string for device supply applies to 917a5766f11SLiam Girdwood * @supply: symbolic name for supply 918a5766f11SLiam Girdwood * 919a5766f11SLiam Girdwood * Allows platform initialisation code to map physical regulator 920a5766f11SLiam Girdwood * sources to symbolic names for supplies for use by devices. Devices 921a5766f11SLiam Girdwood * should use these symbolic names to request regulators, avoiding the 922a5766f11SLiam Girdwood * need to provide board-specific regulator names as platform data. 92340f9244fSMark Brown * 92440f9244fSMark Brown * Only one of consumer_dev and consumer_dev_name may be specified. 925a5766f11SLiam Girdwood */ 926a5766f11SLiam Girdwood static int set_consumer_device_supply(struct regulator_dev *rdev, 92740f9244fSMark Brown struct device *consumer_dev, const char *consumer_dev_name, 92840f9244fSMark Brown const char *supply) 929a5766f11SLiam Girdwood { 930a5766f11SLiam Girdwood struct regulator_map *node; 9319ed2099eSMark Brown int has_dev; 932a5766f11SLiam Girdwood 93340f9244fSMark Brown if (consumer_dev && consumer_dev_name) 93440f9244fSMark Brown return -EINVAL; 93540f9244fSMark Brown 93640f9244fSMark Brown if (!consumer_dev_name && consumer_dev) 93740f9244fSMark Brown consumer_dev_name = dev_name(consumer_dev); 93840f9244fSMark Brown 939a5766f11SLiam Girdwood if (supply == NULL) 940a5766f11SLiam Girdwood return -EINVAL; 941a5766f11SLiam Girdwood 9429ed2099eSMark Brown if (consumer_dev_name != NULL) 9439ed2099eSMark Brown has_dev = 1; 9449ed2099eSMark Brown else 9459ed2099eSMark Brown has_dev = 0; 9469ed2099eSMark Brown 9476001e13cSDavid Brownell list_for_each_entry(node, ®ulator_map_list, list) { 94823b5cc2aSJani Nikula if (node->dev_name && consumer_dev_name) { 94923b5cc2aSJani Nikula if (strcmp(node->dev_name, consumer_dev_name) != 0) 9506001e13cSDavid Brownell continue; 95123b5cc2aSJani Nikula } else if (node->dev_name || consumer_dev_name) { 95223b5cc2aSJani Nikula continue; 95323b5cc2aSJani Nikula } 95423b5cc2aSJani Nikula 9556001e13cSDavid Brownell if (strcmp(node->supply, supply) != 0) 9566001e13cSDavid Brownell continue; 9576001e13cSDavid Brownell 9586001e13cSDavid Brownell dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n", 9596001e13cSDavid Brownell dev_name(&node->regulator->dev), 9606001e13cSDavid Brownell node->regulator->desc->name, 9616001e13cSDavid Brownell supply, 9621083c393SMark Brown dev_name(&rdev->dev), rdev_get_name(rdev)); 9636001e13cSDavid Brownell return -EBUSY; 9646001e13cSDavid Brownell } 9656001e13cSDavid Brownell 9669ed2099eSMark Brown node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); 967a5766f11SLiam Girdwood if (node == NULL) 968a5766f11SLiam Girdwood return -ENOMEM; 969a5766f11SLiam Girdwood 970a5766f11SLiam Girdwood node->regulator = rdev; 971a5766f11SLiam Girdwood node->supply = supply; 972a5766f11SLiam Girdwood 9739ed2099eSMark Brown if (has_dev) { 9749ed2099eSMark Brown node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); 97540f9244fSMark Brown if (node->dev_name == NULL) { 97640f9244fSMark Brown kfree(node); 97740f9244fSMark Brown return -ENOMEM; 97840f9244fSMark Brown } 9799ed2099eSMark Brown } 98040f9244fSMark Brown 981a5766f11SLiam Girdwood list_add(&node->list, ®ulator_map_list); 982a5766f11SLiam Girdwood return 0; 983a5766f11SLiam Girdwood } 984a5766f11SLiam Girdwood 9850f1d747bSMike Rapoport static void unset_regulator_supplies(struct regulator_dev *rdev) 9860f1d747bSMike Rapoport { 9870f1d747bSMike Rapoport struct regulator_map *node, *n; 9880f1d747bSMike Rapoport 9890f1d747bSMike Rapoport list_for_each_entry_safe(node, n, ®ulator_map_list, list) { 9900f1d747bSMike Rapoport if (rdev == node->regulator) { 9910f1d747bSMike Rapoport list_del(&node->list); 99240f9244fSMark Brown kfree(node->dev_name); 9930f1d747bSMike Rapoport kfree(node); 9940f1d747bSMike Rapoport } 9950f1d747bSMike Rapoport } 9960f1d747bSMike Rapoport } 9970f1d747bSMike Rapoport 998414c70cbSLiam Girdwood #define REG_STR_SIZE 32 999414c70cbSLiam Girdwood 1000414c70cbSLiam Girdwood static struct regulator *create_regulator(struct regulator_dev *rdev, 1001414c70cbSLiam Girdwood struct device *dev, 1002414c70cbSLiam Girdwood const char *supply_name) 1003414c70cbSLiam Girdwood { 1004414c70cbSLiam Girdwood struct regulator *regulator; 1005414c70cbSLiam Girdwood char buf[REG_STR_SIZE]; 1006414c70cbSLiam Girdwood int err, size; 1007414c70cbSLiam Girdwood 1008414c70cbSLiam Girdwood regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); 1009414c70cbSLiam Girdwood if (regulator == NULL) 1010414c70cbSLiam Girdwood return NULL; 1011414c70cbSLiam Girdwood 1012414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1013414c70cbSLiam Girdwood regulator->rdev = rdev; 1014414c70cbSLiam Girdwood list_add(®ulator->list, &rdev->consumer_list); 1015414c70cbSLiam Girdwood 1016414c70cbSLiam Girdwood if (dev) { 1017414c70cbSLiam Girdwood /* create a 'requested_microamps_name' sysfs entry */ 1018414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", 1019414c70cbSLiam Girdwood supply_name); 1020414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1021414c70cbSLiam Girdwood goto overflow_err; 1022414c70cbSLiam Girdwood 1023414c70cbSLiam Girdwood regulator->dev = dev; 10244f26a2abSAmeya Palande sysfs_attr_init(®ulator->dev_attr.attr); 1025414c70cbSLiam Girdwood regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL); 1026414c70cbSLiam Girdwood if (regulator->dev_attr.attr.name == NULL) 1027414c70cbSLiam Girdwood goto attr_name_err; 1028414c70cbSLiam Girdwood 1029414c70cbSLiam Girdwood regulator->dev_attr.attr.mode = 0444; 1030414c70cbSLiam Girdwood regulator->dev_attr.show = device_requested_uA_show; 1031414c70cbSLiam Girdwood err = device_create_file(dev, ®ulator->dev_attr); 1032414c70cbSLiam Girdwood if (err < 0) { 1033414c70cbSLiam Girdwood printk(KERN_WARNING "%s: could not add regulator_dev" 1034414c70cbSLiam Girdwood " load sysfs\n", __func__); 1035414c70cbSLiam Girdwood goto attr_name_err; 1036414c70cbSLiam Girdwood } 1037414c70cbSLiam Girdwood 1038414c70cbSLiam Girdwood /* also add a link to the device sysfs entry */ 1039414c70cbSLiam Girdwood size = scnprintf(buf, REG_STR_SIZE, "%s-%s", 1040414c70cbSLiam Girdwood dev->kobj.name, supply_name); 1041414c70cbSLiam Girdwood if (size >= REG_STR_SIZE) 1042414c70cbSLiam Girdwood goto attr_err; 1043414c70cbSLiam Girdwood 1044414c70cbSLiam Girdwood regulator->supply_name = kstrdup(buf, GFP_KERNEL); 1045414c70cbSLiam Girdwood if (regulator->supply_name == NULL) 1046414c70cbSLiam Girdwood goto attr_err; 1047414c70cbSLiam Girdwood 1048414c70cbSLiam Girdwood err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, 1049414c70cbSLiam Girdwood buf); 1050414c70cbSLiam Girdwood if (err) { 1051414c70cbSLiam Girdwood printk(KERN_WARNING 1052414c70cbSLiam Girdwood "%s: could not add device link %s err %d\n", 1053414c70cbSLiam Girdwood __func__, dev->kobj.name, err); 1054414c70cbSLiam Girdwood device_remove_file(dev, ®ulator->dev_attr); 1055414c70cbSLiam Girdwood goto link_name_err; 1056414c70cbSLiam Girdwood } 1057414c70cbSLiam Girdwood } 1058414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1059414c70cbSLiam Girdwood return regulator; 1060414c70cbSLiam Girdwood link_name_err: 1061414c70cbSLiam Girdwood kfree(regulator->supply_name); 1062414c70cbSLiam Girdwood attr_err: 1063414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1064414c70cbSLiam Girdwood attr_name_err: 1065414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1066414c70cbSLiam Girdwood overflow_err: 1067414c70cbSLiam Girdwood list_del(®ulator->list); 1068414c70cbSLiam Girdwood kfree(regulator); 1069414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1070414c70cbSLiam Girdwood return NULL; 1071414c70cbSLiam Girdwood } 1072414c70cbSLiam Girdwood 107331aae2beSMark Brown static int _regulator_get_enable_time(struct regulator_dev *rdev) 107431aae2beSMark Brown { 107531aae2beSMark Brown if (!rdev->desc->ops->enable_time) 107631aae2beSMark Brown return 0; 107731aae2beSMark Brown return rdev->desc->ops->enable_time(rdev); 107831aae2beSMark Brown } 107931aae2beSMark Brown 10805ffbd136SMark Brown /* Internal regulator request function */ 10815ffbd136SMark Brown static struct regulator *_regulator_get(struct device *dev, const char *id, 10825ffbd136SMark Brown int exclusive) 1083414c70cbSLiam Girdwood { 1084414c70cbSLiam Girdwood struct regulator_dev *rdev; 1085414c70cbSLiam Girdwood struct regulator_map *map; 1086414c70cbSLiam Girdwood struct regulator *regulator = ERR_PTR(-ENODEV); 108740f9244fSMark Brown const char *devname = NULL; 10885ffbd136SMark Brown int ret; 1089414c70cbSLiam Girdwood 1090414c70cbSLiam Girdwood if (id == NULL) { 1091414c70cbSLiam Girdwood printk(KERN_ERR "regulator: get() with no identifier\n"); 1092414c70cbSLiam Girdwood return regulator; 1093414c70cbSLiam Girdwood } 1094414c70cbSLiam Girdwood 109540f9244fSMark Brown if (dev) 109640f9244fSMark Brown devname = dev_name(dev); 109740f9244fSMark Brown 1098414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1099414c70cbSLiam Girdwood 1100414c70cbSLiam Girdwood list_for_each_entry(map, ®ulator_map_list, list) { 110140f9244fSMark Brown /* If the mapping has a device set up it must match */ 110240f9244fSMark Brown if (map->dev_name && 110340f9244fSMark Brown (!devname || strcmp(map->dev_name, devname))) 110440f9244fSMark Brown continue; 110540f9244fSMark Brown 110640f9244fSMark Brown if (strcmp(map->supply, id) == 0) { 1107a5766f11SLiam Girdwood rdev = map->regulator; 1108414c70cbSLiam Girdwood goto found; 1109414c70cbSLiam Girdwood } 1110a5766f11SLiam Girdwood } 111134abbd68SMark Brown 1112688fe99aSMark Brown if (board_wants_dummy_regulator) { 1113688fe99aSMark Brown rdev = dummy_regulator_rdev; 1114688fe99aSMark Brown goto found; 1115688fe99aSMark Brown } 1116688fe99aSMark Brown 111734abbd68SMark Brown #ifdef CONFIG_REGULATOR_DUMMY 111834abbd68SMark Brown if (!devname) 111934abbd68SMark Brown devname = "deviceless"; 112034abbd68SMark Brown 112134abbd68SMark Brown /* If the board didn't flag that it was fully constrained then 112234abbd68SMark Brown * substitute in a dummy regulator so consumers can continue. 112334abbd68SMark Brown */ 112434abbd68SMark Brown if (!has_full_constraints) { 112534abbd68SMark Brown pr_warning("%s supply %s not found, using dummy regulator\n", 112634abbd68SMark Brown devname, id); 112734abbd68SMark Brown rdev = dummy_regulator_rdev; 112834abbd68SMark Brown goto found; 112934abbd68SMark Brown } 113034abbd68SMark Brown #endif 113134abbd68SMark Brown 1132414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1133414c70cbSLiam Girdwood return regulator; 1134414c70cbSLiam Girdwood 1135414c70cbSLiam Girdwood found: 11365ffbd136SMark Brown if (rdev->exclusive) { 11375ffbd136SMark Brown regulator = ERR_PTR(-EPERM); 11385ffbd136SMark Brown goto out; 11395ffbd136SMark Brown } 11405ffbd136SMark Brown 11415ffbd136SMark Brown if (exclusive && rdev->open_count) { 11425ffbd136SMark Brown regulator = ERR_PTR(-EBUSY); 11435ffbd136SMark Brown goto out; 11445ffbd136SMark Brown } 11455ffbd136SMark Brown 1146a5766f11SLiam Girdwood if (!try_module_get(rdev->owner)) 1147a5766f11SLiam Girdwood goto out; 1148a5766f11SLiam Girdwood 1149414c70cbSLiam Girdwood regulator = create_regulator(rdev, dev, id); 1150414c70cbSLiam Girdwood if (regulator == NULL) { 1151414c70cbSLiam Girdwood regulator = ERR_PTR(-ENOMEM); 1152414c70cbSLiam Girdwood module_put(rdev->owner); 1153414c70cbSLiam Girdwood } 1154414c70cbSLiam Girdwood 11555ffbd136SMark Brown rdev->open_count++; 11565ffbd136SMark Brown if (exclusive) { 11575ffbd136SMark Brown rdev->exclusive = 1; 11585ffbd136SMark Brown 11595ffbd136SMark Brown ret = _regulator_is_enabled(rdev); 11605ffbd136SMark Brown if (ret > 0) 11615ffbd136SMark Brown rdev->use_count = 1; 11625ffbd136SMark Brown else 11635ffbd136SMark Brown rdev->use_count = 0; 11645ffbd136SMark Brown } 11655ffbd136SMark Brown 1166a5766f11SLiam Girdwood out: 1167414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 11685ffbd136SMark Brown 1169414c70cbSLiam Girdwood return regulator; 1170414c70cbSLiam Girdwood } 11715ffbd136SMark Brown 11725ffbd136SMark Brown /** 11735ffbd136SMark Brown * regulator_get - lookup and obtain a reference to a regulator. 11745ffbd136SMark Brown * @dev: device for regulator "consumer" 11755ffbd136SMark Brown * @id: Supply name or regulator ID. 11765ffbd136SMark Brown * 11775ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 11785ffbd136SMark Brown * or IS_ERR() condition containing errno. 11795ffbd136SMark Brown * 11805ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 11815ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 11825ffbd136SMark Brown * should match the name used for the supply and/or the relevant 11835ffbd136SMark Brown * device pins in the datasheet. 11845ffbd136SMark Brown */ 11855ffbd136SMark Brown struct regulator *regulator_get(struct device *dev, const char *id) 11865ffbd136SMark Brown { 11875ffbd136SMark Brown return _regulator_get(dev, id, 0); 11885ffbd136SMark Brown } 1189414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get); 1190414c70cbSLiam Girdwood 1191414c70cbSLiam Girdwood /** 11925ffbd136SMark Brown * regulator_get_exclusive - obtain exclusive access to a regulator. 11935ffbd136SMark Brown * @dev: device for regulator "consumer" 11945ffbd136SMark Brown * @id: Supply name or regulator ID. 11955ffbd136SMark Brown * 11965ffbd136SMark Brown * Returns a struct regulator corresponding to the regulator producer, 11975ffbd136SMark Brown * or IS_ERR() condition containing errno. Other consumers will be 11985ffbd136SMark Brown * unable to obtain this reference is held and the use count for the 11995ffbd136SMark Brown * regulator will be initialised to reflect the current state of the 12005ffbd136SMark Brown * regulator. 12015ffbd136SMark Brown * 12025ffbd136SMark Brown * This is intended for use by consumers which cannot tolerate shared 12035ffbd136SMark Brown * use of the regulator such as those which need to force the 12045ffbd136SMark Brown * regulator off for correct operation of the hardware they are 12055ffbd136SMark Brown * controlling. 12065ffbd136SMark Brown * 12075ffbd136SMark Brown * Use of supply names configured via regulator_set_device_supply() is 12085ffbd136SMark Brown * strongly encouraged. It is recommended that the supply name used 12095ffbd136SMark Brown * should match the name used for the supply and/or the relevant 12105ffbd136SMark Brown * device pins in the datasheet. 12115ffbd136SMark Brown */ 12125ffbd136SMark Brown struct regulator *regulator_get_exclusive(struct device *dev, const char *id) 12135ffbd136SMark Brown { 12145ffbd136SMark Brown return _regulator_get(dev, id, 1); 12155ffbd136SMark Brown } 12165ffbd136SMark Brown EXPORT_SYMBOL_GPL(regulator_get_exclusive); 12175ffbd136SMark Brown 12185ffbd136SMark Brown /** 1219414c70cbSLiam Girdwood * regulator_put - "free" the regulator source 1220414c70cbSLiam Girdwood * @regulator: regulator source 1221414c70cbSLiam Girdwood * 1222414c70cbSLiam Girdwood * Note: drivers must ensure that all regulator_enable calls made on this 1223414c70cbSLiam Girdwood * regulator source are balanced by regulator_disable calls prior to calling 1224414c70cbSLiam Girdwood * this function. 1225414c70cbSLiam Girdwood */ 1226414c70cbSLiam Girdwood void regulator_put(struct regulator *regulator) 1227414c70cbSLiam Girdwood { 1228414c70cbSLiam Girdwood struct regulator_dev *rdev; 1229414c70cbSLiam Girdwood 1230414c70cbSLiam Girdwood if (regulator == NULL || IS_ERR(regulator)) 1231414c70cbSLiam Girdwood return; 1232414c70cbSLiam Girdwood 1233414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 1234414c70cbSLiam Girdwood rdev = regulator->rdev; 1235414c70cbSLiam Girdwood 1236414c70cbSLiam Girdwood /* remove any sysfs entries */ 1237414c70cbSLiam Girdwood if (regulator->dev) { 1238414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); 1239414c70cbSLiam Girdwood kfree(regulator->supply_name); 1240414c70cbSLiam Girdwood device_remove_file(regulator->dev, ®ulator->dev_attr); 1241414c70cbSLiam Girdwood kfree(regulator->dev_attr.attr.name); 1242414c70cbSLiam Girdwood } 1243414c70cbSLiam Girdwood list_del(®ulator->list); 1244414c70cbSLiam Girdwood kfree(regulator); 1245414c70cbSLiam Girdwood 12465ffbd136SMark Brown rdev->open_count--; 12475ffbd136SMark Brown rdev->exclusive = 0; 12485ffbd136SMark Brown 1249414c70cbSLiam Girdwood module_put(rdev->owner); 1250414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 1251414c70cbSLiam Girdwood } 1252414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_put); 1253414c70cbSLiam Girdwood 12549a2372faSMark Brown static int _regulator_can_change_status(struct regulator_dev *rdev) 12559a2372faSMark Brown { 12569a2372faSMark Brown if (!rdev->constraints) 12579a2372faSMark Brown return 0; 12589a2372faSMark Brown 12599a2372faSMark Brown if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) 12609a2372faSMark Brown return 1; 12619a2372faSMark Brown else 12629a2372faSMark Brown return 0; 12639a2372faSMark Brown } 12649a2372faSMark Brown 1265414c70cbSLiam Girdwood /* locks held by regulator_enable() */ 1266414c70cbSLiam Girdwood static int _regulator_enable(struct regulator_dev *rdev) 1267414c70cbSLiam Girdwood { 126831aae2beSMark Brown int ret, delay; 1269414c70cbSLiam Girdwood 1270414c70cbSLiam Girdwood /* do we need to enable the supply regulator first */ 1271414c70cbSLiam Girdwood if (rdev->supply) { 1272414c70cbSLiam Girdwood ret = _regulator_enable(rdev->supply); 1273414c70cbSLiam Girdwood if (ret < 0) { 1274414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to enable %s: %d\n", 12751083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1276414c70cbSLiam Girdwood return ret; 1277414c70cbSLiam Girdwood } 1278414c70cbSLiam Girdwood } 1279414c70cbSLiam Girdwood 1280414c70cbSLiam Girdwood /* check voltage and requested load before enabling */ 1281414c70cbSLiam Girdwood if (rdev->constraints && 12829a2372faSMark Brown (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) 1283414c70cbSLiam Girdwood drms_uA_update(rdev); 1284414c70cbSLiam Girdwood 12859a2372faSMark Brown if (rdev->use_count == 0) { 12869a2372faSMark Brown /* The regulator may on if it's not switchable or left on */ 12879a2372faSMark Brown ret = _regulator_is_enabled(rdev); 12889a2372faSMark Brown if (ret == -EINVAL || ret == 0) { 12899a2372faSMark Brown if (!_regulator_can_change_status(rdev)) 12909a2372faSMark Brown return -EPERM; 12919a2372faSMark Brown 129231aae2beSMark Brown if (!rdev->desc->ops->enable) 129331aae2beSMark Brown return -EINVAL; 129431aae2beSMark Brown 129531aae2beSMark Brown /* Query before enabling in case configuration 129631aae2beSMark Brown * dependant. */ 129731aae2beSMark Brown ret = _regulator_get_enable_time(rdev); 129831aae2beSMark Brown if (ret >= 0) { 129931aae2beSMark Brown delay = ret; 130031aae2beSMark Brown } else { 130131aae2beSMark Brown printk(KERN_WARNING 130231aae2beSMark Brown "%s: enable_time() failed for %s: %d\n", 130331aae2beSMark Brown __func__, rdev_get_name(rdev), 130431aae2beSMark Brown ret); 130531aae2beSMark Brown delay = 0; 130631aae2beSMark Brown } 130731aae2beSMark Brown 130831aae2beSMark Brown /* Allow the regulator to ramp; it would be useful 130931aae2beSMark Brown * to extend this for bulk operations so that the 131031aae2beSMark Brown * regulators can ramp together. */ 1311414c70cbSLiam Girdwood ret = rdev->desc->ops->enable(rdev); 13129a2372faSMark Brown if (ret < 0) 13139a2372faSMark Brown return ret; 131431aae2beSMark Brown 131531aae2beSMark Brown if (delay >= 1000) 131631aae2beSMark Brown mdelay(delay / 1000); 131731aae2beSMark Brown else if (delay) 131831aae2beSMark Brown udelay(delay); 131931aae2beSMark Brown 1320a7433cffSLinus Walleij } else if (ret < 0) { 13219a2372faSMark Brown printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n", 13221083c393SMark Brown __func__, rdev_get_name(rdev), ret); 1323414c70cbSLiam Girdwood return ret; 1324414c70cbSLiam Girdwood } 1325a7433cffSLinus Walleij /* Fallthrough on positive return values - already enabled */ 1326414c70cbSLiam Girdwood } 1327414c70cbSLiam Girdwood 13289a2372faSMark Brown rdev->use_count++; 13299a2372faSMark Brown 13309a2372faSMark Brown return 0; 1331414c70cbSLiam Girdwood } 1332414c70cbSLiam Girdwood 1333414c70cbSLiam Girdwood /** 1334414c70cbSLiam Girdwood * regulator_enable - enable regulator output 1335414c70cbSLiam Girdwood * @regulator: regulator source 1336414c70cbSLiam Girdwood * 1337cf7bbcdfSMark Brown * Request that the regulator be enabled with the regulator output at 1338cf7bbcdfSMark Brown * the predefined voltage or current value. Calls to regulator_enable() 1339cf7bbcdfSMark Brown * must be balanced with calls to regulator_disable(). 1340cf7bbcdfSMark Brown * 1341414c70cbSLiam Girdwood * NOTE: the output value can be set by other drivers, boot loader or may be 1342cf7bbcdfSMark Brown * hardwired in the regulator. 1343414c70cbSLiam Girdwood */ 1344414c70cbSLiam Girdwood int regulator_enable(struct regulator *regulator) 1345414c70cbSLiam Girdwood { 1346412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1347412aec61SDavid Brownell int ret = 0; 1348414c70cbSLiam Girdwood 1349412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1350412aec61SDavid Brownell ret = _regulator_enable(rdev); 1351412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 1352414c70cbSLiam Girdwood return ret; 1353414c70cbSLiam Girdwood } 1354414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_enable); 1355414c70cbSLiam Girdwood 1356414c70cbSLiam Girdwood /* locks held by regulator_disable() */ 1357414c70cbSLiam Girdwood static int _regulator_disable(struct regulator_dev *rdev) 1358414c70cbSLiam Girdwood { 1359414c70cbSLiam Girdwood int ret = 0; 1360414c70cbSLiam Girdwood 1361cd94b505SDavid Brownell if (WARN(rdev->use_count <= 0, 1362cd94b505SDavid Brownell "unbalanced disables for %s\n", 13631083c393SMark Brown rdev_get_name(rdev))) 1364cd94b505SDavid Brownell return -EIO; 1365cd94b505SDavid Brownell 1366414c70cbSLiam Girdwood /* are we the last user and permitted to disable ? */ 136760ef66fcSMark Brown if (rdev->use_count == 1 && 136860ef66fcSMark Brown (rdev->constraints && !rdev->constraints->always_on)) { 1369414c70cbSLiam Girdwood 1370414c70cbSLiam Girdwood /* we are last user */ 13719a2372faSMark Brown if (_regulator_can_change_status(rdev) && 13729a2372faSMark Brown rdev->desc->ops->disable) { 1373414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1374414c70cbSLiam Girdwood if (ret < 0) { 1375414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to disable %s\n", 13761083c393SMark Brown __func__, rdev_get_name(rdev)); 1377414c70cbSLiam Girdwood return ret; 1378414c70cbSLiam Girdwood } 137984b68263SMark Brown 138084b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, 138184b68263SMark Brown NULL); 1382414c70cbSLiam Girdwood } 1383414c70cbSLiam Girdwood 1384414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 1385414c70cbSLiam Girdwood if (rdev->supply) 1386414c70cbSLiam Girdwood _regulator_disable(rdev->supply); 1387414c70cbSLiam Girdwood 1388414c70cbSLiam Girdwood rdev->use_count = 0; 1389414c70cbSLiam Girdwood } else if (rdev->use_count > 1) { 1390414c70cbSLiam Girdwood 1391414c70cbSLiam Girdwood if (rdev->constraints && 1392414c70cbSLiam Girdwood (rdev->constraints->valid_ops_mask & 1393414c70cbSLiam Girdwood REGULATOR_CHANGE_DRMS)) 1394414c70cbSLiam Girdwood drms_uA_update(rdev); 1395414c70cbSLiam Girdwood 1396414c70cbSLiam Girdwood rdev->use_count--; 1397414c70cbSLiam Girdwood } 1398414c70cbSLiam Girdwood return ret; 1399414c70cbSLiam Girdwood } 1400414c70cbSLiam Girdwood 1401414c70cbSLiam Girdwood /** 1402414c70cbSLiam Girdwood * regulator_disable - disable regulator output 1403414c70cbSLiam Girdwood * @regulator: regulator source 1404414c70cbSLiam Girdwood * 1405cf7bbcdfSMark Brown * Disable the regulator output voltage or current. Calls to 1406cf7bbcdfSMark Brown * regulator_enable() must be balanced with calls to 1407cf7bbcdfSMark Brown * regulator_disable(). 140869279fb9SMark Brown * 1409414c70cbSLiam Girdwood * NOTE: this will only disable the regulator output if no other consumer 1410cf7bbcdfSMark Brown * devices have it enabled, the regulator device supports disabling and 1411cf7bbcdfSMark Brown * machine constraints permit this operation. 1412414c70cbSLiam Girdwood */ 1413414c70cbSLiam Girdwood int regulator_disable(struct regulator *regulator) 1414414c70cbSLiam Girdwood { 1415412aec61SDavid Brownell struct regulator_dev *rdev = regulator->rdev; 1416412aec61SDavid Brownell int ret = 0; 1417414c70cbSLiam Girdwood 1418412aec61SDavid Brownell mutex_lock(&rdev->mutex); 1419412aec61SDavid Brownell ret = _regulator_disable(rdev); 1420412aec61SDavid Brownell mutex_unlock(&rdev->mutex); 1421414c70cbSLiam Girdwood return ret; 1422414c70cbSLiam Girdwood } 1423414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_disable); 1424414c70cbSLiam Girdwood 1425414c70cbSLiam Girdwood /* locks held by regulator_force_disable() */ 1426414c70cbSLiam Girdwood static int _regulator_force_disable(struct regulator_dev *rdev) 1427414c70cbSLiam Girdwood { 1428414c70cbSLiam Girdwood int ret = 0; 1429414c70cbSLiam Girdwood 1430414c70cbSLiam Girdwood /* force disable */ 1431414c70cbSLiam Girdwood if (rdev->desc->ops->disable) { 1432414c70cbSLiam Girdwood /* ah well, who wants to live forever... */ 1433414c70cbSLiam Girdwood ret = rdev->desc->ops->disable(rdev); 1434414c70cbSLiam Girdwood if (ret < 0) { 1435414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to force disable %s\n", 14361083c393SMark Brown __func__, rdev_get_name(rdev)); 1437414c70cbSLiam Girdwood return ret; 1438414c70cbSLiam Girdwood } 1439414c70cbSLiam Girdwood /* notify other consumers that power has been forced off */ 144084b68263SMark Brown _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | 144184b68263SMark Brown REGULATOR_EVENT_DISABLE, NULL); 1442414c70cbSLiam Girdwood } 1443414c70cbSLiam Girdwood 1444414c70cbSLiam Girdwood /* decrease our supplies ref count and disable if required */ 1445414c70cbSLiam Girdwood if (rdev->supply) 1446414c70cbSLiam Girdwood _regulator_disable(rdev->supply); 1447414c70cbSLiam Girdwood 1448414c70cbSLiam Girdwood rdev->use_count = 0; 1449414c70cbSLiam Girdwood return ret; 1450414c70cbSLiam Girdwood } 1451414c70cbSLiam Girdwood 1452414c70cbSLiam Girdwood /** 1453414c70cbSLiam Girdwood * regulator_force_disable - force disable regulator output 1454414c70cbSLiam Girdwood * @regulator: regulator source 1455414c70cbSLiam Girdwood * 1456414c70cbSLiam Girdwood * Forcibly disable the regulator output voltage or current. 1457414c70cbSLiam Girdwood * NOTE: this *will* disable the regulator output even if other consumer 1458414c70cbSLiam Girdwood * devices have it enabled. This should be used for situations when device 1459414c70cbSLiam Girdwood * damage will likely occur if the regulator is not disabled (e.g. over temp). 1460414c70cbSLiam Girdwood */ 1461414c70cbSLiam Girdwood int regulator_force_disable(struct regulator *regulator) 1462414c70cbSLiam Girdwood { 1463414c70cbSLiam Girdwood int ret; 1464414c70cbSLiam Girdwood 1465414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1466414c70cbSLiam Girdwood regulator->uA_load = 0; 1467414c70cbSLiam Girdwood ret = _regulator_force_disable(regulator->rdev); 1468414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 1469414c70cbSLiam Girdwood return ret; 1470414c70cbSLiam Girdwood } 1471414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_force_disable); 1472414c70cbSLiam Girdwood 1473414c70cbSLiam Girdwood static int _regulator_is_enabled(struct regulator_dev *rdev) 1474414c70cbSLiam Girdwood { 14759a7f6a4cSMark Brown /* If we don't know then assume that the regulator is always on */ 14769332546fSMark Brown if (!rdev->desc->ops->is_enabled) 14779a7f6a4cSMark Brown return 1; 1478414c70cbSLiam Girdwood 14799332546fSMark Brown return rdev->desc->ops->is_enabled(rdev); 1480414c70cbSLiam Girdwood } 1481414c70cbSLiam Girdwood 1482414c70cbSLiam Girdwood /** 1483414c70cbSLiam Girdwood * regulator_is_enabled - is the regulator output enabled 1484414c70cbSLiam Girdwood * @regulator: regulator source 1485414c70cbSLiam Girdwood * 1486412aec61SDavid Brownell * Returns positive if the regulator driver backing the source/client 1487412aec61SDavid Brownell * has requested that the device be enabled, zero if it hasn't, else a 1488412aec61SDavid Brownell * negative errno code. 1489412aec61SDavid Brownell * 1490412aec61SDavid Brownell * Note that the device backing this regulator handle can have multiple 1491412aec61SDavid Brownell * users, so it might be enabled even if regulator_enable() was never 1492412aec61SDavid Brownell * called for this particular source. 1493414c70cbSLiam Girdwood */ 1494414c70cbSLiam Girdwood int regulator_is_enabled(struct regulator *regulator) 1495414c70cbSLiam Girdwood { 14969332546fSMark Brown int ret; 14979332546fSMark Brown 14989332546fSMark Brown mutex_lock(®ulator->rdev->mutex); 14999332546fSMark Brown ret = _regulator_is_enabled(regulator->rdev); 15009332546fSMark Brown mutex_unlock(®ulator->rdev->mutex); 15019332546fSMark Brown 15029332546fSMark Brown return ret; 1503414c70cbSLiam Girdwood } 1504414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_is_enabled); 1505414c70cbSLiam Girdwood 1506414c70cbSLiam Girdwood /** 15074367cfdcSDavid Brownell * regulator_count_voltages - count regulator_list_voltage() selectors 15084367cfdcSDavid Brownell * @regulator: regulator source 15094367cfdcSDavid Brownell * 15104367cfdcSDavid Brownell * Returns number of selectors, or negative errno. Selectors are 15114367cfdcSDavid Brownell * numbered starting at zero, and typically correspond to bitfields 15124367cfdcSDavid Brownell * in hardware registers. 15134367cfdcSDavid Brownell */ 15144367cfdcSDavid Brownell int regulator_count_voltages(struct regulator *regulator) 15154367cfdcSDavid Brownell { 15164367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15174367cfdcSDavid Brownell 15184367cfdcSDavid Brownell return rdev->desc->n_voltages ? : -EINVAL; 15194367cfdcSDavid Brownell } 15204367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_count_voltages); 15214367cfdcSDavid Brownell 15224367cfdcSDavid Brownell /** 15234367cfdcSDavid Brownell * regulator_list_voltage - enumerate supported voltages 15244367cfdcSDavid Brownell * @regulator: regulator source 15254367cfdcSDavid Brownell * @selector: identify voltage to list 15264367cfdcSDavid Brownell * Context: can sleep 15274367cfdcSDavid Brownell * 15284367cfdcSDavid Brownell * Returns a voltage that can be passed to @regulator_set_voltage(), 152988393161SThomas Weber * zero if this selector code can't be used on this system, or a 15304367cfdcSDavid Brownell * negative errno. 15314367cfdcSDavid Brownell */ 15324367cfdcSDavid Brownell int regulator_list_voltage(struct regulator *regulator, unsigned selector) 15334367cfdcSDavid Brownell { 15344367cfdcSDavid Brownell struct regulator_dev *rdev = regulator->rdev; 15354367cfdcSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 15364367cfdcSDavid Brownell int ret; 15374367cfdcSDavid Brownell 15384367cfdcSDavid Brownell if (!ops->list_voltage || selector >= rdev->desc->n_voltages) 15394367cfdcSDavid Brownell return -EINVAL; 15404367cfdcSDavid Brownell 15414367cfdcSDavid Brownell mutex_lock(&rdev->mutex); 15424367cfdcSDavid Brownell ret = ops->list_voltage(rdev, selector); 15434367cfdcSDavid Brownell mutex_unlock(&rdev->mutex); 15444367cfdcSDavid Brownell 15454367cfdcSDavid Brownell if (ret > 0) { 15464367cfdcSDavid Brownell if (ret < rdev->constraints->min_uV) 15474367cfdcSDavid Brownell ret = 0; 15484367cfdcSDavid Brownell else if (ret > rdev->constraints->max_uV) 15494367cfdcSDavid Brownell ret = 0; 15504367cfdcSDavid Brownell } 15514367cfdcSDavid Brownell 15524367cfdcSDavid Brownell return ret; 15534367cfdcSDavid Brownell } 15544367cfdcSDavid Brownell EXPORT_SYMBOL_GPL(regulator_list_voltage); 15554367cfdcSDavid Brownell 15564367cfdcSDavid Brownell /** 1557a7a1ad90SMark Brown * regulator_is_supported_voltage - check if a voltage range can be supported 1558a7a1ad90SMark Brown * 1559a7a1ad90SMark Brown * @regulator: Regulator to check. 1560a7a1ad90SMark Brown * @min_uV: Minimum required voltage in uV. 1561a7a1ad90SMark Brown * @max_uV: Maximum required voltage in uV. 1562a7a1ad90SMark Brown * 1563a7a1ad90SMark Brown * Returns a boolean or a negative error code. 1564a7a1ad90SMark Brown */ 1565a7a1ad90SMark Brown int regulator_is_supported_voltage(struct regulator *regulator, 1566a7a1ad90SMark Brown int min_uV, int max_uV) 1567a7a1ad90SMark Brown { 1568a7a1ad90SMark Brown int i, voltages, ret; 1569a7a1ad90SMark Brown 1570a7a1ad90SMark Brown ret = regulator_count_voltages(regulator); 1571a7a1ad90SMark Brown if (ret < 0) 1572a7a1ad90SMark Brown return ret; 1573a7a1ad90SMark Brown voltages = ret; 1574a7a1ad90SMark Brown 1575a7a1ad90SMark Brown for (i = 0; i < voltages; i++) { 1576a7a1ad90SMark Brown ret = regulator_list_voltage(regulator, i); 1577a7a1ad90SMark Brown 1578a7a1ad90SMark Brown if (ret >= min_uV && ret <= max_uV) 1579a7a1ad90SMark Brown return 1; 1580a7a1ad90SMark Brown } 1581a7a1ad90SMark Brown 1582a7a1ad90SMark Brown return 0; 1583a7a1ad90SMark Brown } 1584a7a1ad90SMark Brown 1585a7a1ad90SMark Brown /** 1586414c70cbSLiam Girdwood * regulator_set_voltage - set regulator output voltage 1587414c70cbSLiam Girdwood * @regulator: regulator source 1588414c70cbSLiam Girdwood * @min_uV: Minimum required voltage in uV 1589414c70cbSLiam Girdwood * @max_uV: Maximum acceptable voltage in uV 1590414c70cbSLiam Girdwood * 1591414c70cbSLiam Girdwood * Sets a voltage regulator to the desired output voltage. This can be set 1592414c70cbSLiam Girdwood * during any regulator state. IOW, regulator can be disabled or enabled. 1593414c70cbSLiam Girdwood * 1594414c70cbSLiam Girdwood * If the regulator is enabled then the voltage will change to the new value 1595414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1596414c70cbSLiam Girdwood * output at the new voltage when enabled. 1597414c70cbSLiam Girdwood * 1598414c70cbSLiam Girdwood * NOTE: If the regulator is shared between several devices then the lowest 1599414c70cbSLiam Girdwood * request voltage that meets the system constraints will be used. 160069279fb9SMark Brown * Regulator system constraints must be set for this regulator before 1601414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1602414c70cbSLiam Girdwood */ 1603414c70cbSLiam Girdwood int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV) 1604414c70cbSLiam Girdwood { 1605414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1606414c70cbSLiam Girdwood int ret; 1607414c70cbSLiam Girdwood 1608414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1609414c70cbSLiam Girdwood 1610414c70cbSLiam Girdwood /* sanity check */ 1611414c70cbSLiam Girdwood if (!rdev->desc->ops->set_voltage) { 1612414c70cbSLiam Girdwood ret = -EINVAL; 1613414c70cbSLiam Girdwood goto out; 1614414c70cbSLiam Girdwood } 1615414c70cbSLiam Girdwood 1616414c70cbSLiam Girdwood /* constraints check */ 1617414c70cbSLiam Girdwood ret = regulator_check_voltage(rdev, &min_uV, &max_uV); 1618414c70cbSLiam Girdwood if (ret < 0) 1619414c70cbSLiam Girdwood goto out; 1620414c70cbSLiam Girdwood regulator->min_uV = min_uV; 1621414c70cbSLiam Girdwood regulator->max_uV = max_uV; 1622414c70cbSLiam Girdwood ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV); 1623414c70cbSLiam Girdwood 1624414c70cbSLiam Girdwood out: 1625b136fb44SJonathan Cameron _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL); 1626414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1627414c70cbSLiam Girdwood return ret; 1628414c70cbSLiam Girdwood } 1629414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_voltage); 1630414c70cbSLiam Girdwood 1631414c70cbSLiam Girdwood static int _regulator_get_voltage(struct regulator_dev *rdev) 1632414c70cbSLiam Girdwood { 1633414c70cbSLiam Girdwood /* sanity check */ 1634414c70cbSLiam Girdwood if (rdev->desc->ops->get_voltage) 1635414c70cbSLiam Girdwood return rdev->desc->ops->get_voltage(rdev); 1636414c70cbSLiam Girdwood else 1637414c70cbSLiam Girdwood return -EINVAL; 1638414c70cbSLiam Girdwood } 1639414c70cbSLiam Girdwood 1640414c70cbSLiam Girdwood /** 1641414c70cbSLiam Girdwood * regulator_get_voltage - get regulator output voltage 1642414c70cbSLiam Girdwood * @regulator: regulator source 1643414c70cbSLiam Girdwood * 1644414c70cbSLiam Girdwood * This returns the current regulator voltage in uV. 1645414c70cbSLiam Girdwood * 1646414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the voltage value. This 1647414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1648414c70cbSLiam Girdwood */ 1649414c70cbSLiam Girdwood int regulator_get_voltage(struct regulator *regulator) 1650414c70cbSLiam Girdwood { 1651414c70cbSLiam Girdwood int ret; 1652414c70cbSLiam Girdwood 1653414c70cbSLiam Girdwood mutex_lock(®ulator->rdev->mutex); 1654414c70cbSLiam Girdwood 1655414c70cbSLiam Girdwood ret = _regulator_get_voltage(regulator->rdev); 1656414c70cbSLiam Girdwood 1657414c70cbSLiam Girdwood mutex_unlock(®ulator->rdev->mutex); 1658414c70cbSLiam Girdwood 1659414c70cbSLiam Girdwood return ret; 1660414c70cbSLiam Girdwood } 1661414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_voltage); 1662414c70cbSLiam Girdwood 1663414c70cbSLiam Girdwood /** 1664414c70cbSLiam Girdwood * regulator_set_current_limit - set regulator output current limit 1665414c70cbSLiam Girdwood * @regulator: regulator source 1666414c70cbSLiam Girdwood * @min_uA: Minimuum supported current in uA 1667414c70cbSLiam Girdwood * @max_uA: Maximum supported current in uA 1668414c70cbSLiam Girdwood * 1669414c70cbSLiam Girdwood * Sets current sink to the desired output current. This can be set during 1670414c70cbSLiam Girdwood * any regulator state. IOW, regulator can be disabled or enabled. 1671414c70cbSLiam Girdwood * 1672414c70cbSLiam Girdwood * If the regulator is enabled then the current will change to the new value 1673414c70cbSLiam Girdwood * immediately otherwise if the regulator is disabled the regulator will 1674414c70cbSLiam Girdwood * output at the new current when enabled. 1675414c70cbSLiam Girdwood * 1676414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1677414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1678414c70cbSLiam Girdwood */ 1679414c70cbSLiam Girdwood int regulator_set_current_limit(struct regulator *regulator, 1680414c70cbSLiam Girdwood int min_uA, int max_uA) 1681414c70cbSLiam Girdwood { 1682414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1683414c70cbSLiam Girdwood int ret; 1684414c70cbSLiam Girdwood 1685414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1686414c70cbSLiam Girdwood 1687414c70cbSLiam Girdwood /* sanity check */ 1688414c70cbSLiam Girdwood if (!rdev->desc->ops->set_current_limit) { 1689414c70cbSLiam Girdwood ret = -EINVAL; 1690414c70cbSLiam Girdwood goto out; 1691414c70cbSLiam Girdwood } 1692414c70cbSLiam Girdwood 1693414c70cbSLiam Girdwood /* constraints check */ 1694414c70cbSLiam Girdwood ret = regulator_check_current_limit(rdev, &min_uA, &max_uA); 1695414c70cbSLiam Girdwood if (ret < 0) 1696414c70cbSLiam Girdwood goto out; 1697414c70cbSLiam Girdwood 1698414c70cbSLiam Girdwood ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA); 1699414c70cbSLiam Girdwood out: 1700414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1701414c70cbSLiam Girdwood return ret; 1702414c70cbSLiam Girdwood } 1703414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_current_limit); 1704414c70cbSLiam Girdwood 1705414c70cbSLiam Girdwood static int _regulator_get_current_limit(struct regulator_dev *rdev) 1706414c70cbSLiam Girdwood { 1707414c70cbSLiam Girdwood int ret; 1708414c70cbSLiam Girdwood 1709414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1710414c70cbSLiam Girdwood 1711414c70cbSLiam Girdwood /* sanity check */ 1712414c70cbSLiam Girdwood if (!rdev->desc->ops->get_current_limit) { 1713414c70cbSLiam Girdwood ret = -EINVAL; 1714414c70cbSLiam Girdwood goto out; 1715414c70cbSLiam Girdwood } 1716414c70cbSLiam Girdwood 1717414c70cbSLiam Girdwood ret = rdev->desc->ops->get_current_limit(rdev); 1718414c70cbSLiam Girdwood out: 1719414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1720414c70cbSLiam Girdwood return ret; 1721414c70cbSLiam Girdwood } 1722414c70cbSLiam Girdwood 1723414c70cbSLiam Girdwood /** 1724414c70cbSLiam Girdwood * regulator_get_current_limit - get regulator output current 1725414c70cbSLiam Girdwood * @regulator: regulator source 1726414c70cbSLiam Girdwood * 1727414c70cbSLiam Girdwood * This returns the current supplied by the specified current sink in uA. 1728414c70cbSLiam Girdwood * 1729414c70cbSLiam Girdwood * NOTE: If the regulator is disabled it will return the current value. This 1730414c70cbSLiam Girdwood * function should not be used to determine regulator state. 1731414c70cbSLiam Girdwood */ 1732414c70cbSLiam Girdwood int regulator_get_current_limit(struct regulator *regulator) 1733414c70cbSLiam Girdwood { 1734414c70cbSLiam Girdwood return _regulator_get_current_limit(regulator->rdev); 1735414c70cbSLiam Girdwood } 1736414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_current_limit); 1737414c70cbSLiam Girdwood 1738414c70cbSLiam Girdwood /** 1739414c70cbSLiam Girdwood * regulator_set_mode - set regulator operating mode 1740414c70cbSLiam Girdwood * @regulator: regulator source 1741414c70cbSLiam Girdwood * @mode: operating mode - one of the REGULATOR_MODE constants 1742414c70cbSLiam Girdwood * 1743414c70cbSLiam Girdwood * Set regulator operating mode to increase regulator efficiency or improve 1744414c70cbSLiam Girdwood * regulation performance. 1745414c70cbSLiam Girdwood * 1746414c70cbSLiam Girdwood * NOTE: Regulator system constraints must be set for this regulator before 1747414c70cbSLiam Girdwood * calling this function otherwise this call will fail. 1748414c70cbSLiam Girdwood */ 1749414c70cbSLiam Girdwood int regulator_set_mode(struct regulator *regulator, unsigned int mode) 1750414c70cbSLiam Girdwood { 1751414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1752414c70cbSLiam Girdwood int ret; 1753500b4ac9SSundar R Iyer int regulator_curr_mode; 1754414c70cbSLiam Girdwood 1755414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1756414c70cbSLiam Girdwood 1757414c70cbSLiam Girdwood /* sanity check */ 1758414c70cbSLiam Girdwood if (!rdev->desc->ops->set_mode) { 1759414c70cbSLiam Girdwood ret = -EINVAL; 1760414c70cbSLiam Girdwood goto out; 1761414c70cbSLiam Girdwood } 1762414c70cbSLiam Girdwood 1763500b4ac9SSundar R Iyer /* return if the same mode is requested */ 1764500b4ac9SSundar R Iyer if (rdev->desc->ops->get_mode) { 1765500b4ac9SSundar R Iyer regulator_curr_mode = rdev->desc->ops->get_mode(rdev); 1766500b4ac9SSundar R Iyer if (regulator_curr_mode == mode) { 1767500b4ac9SSundar R Iyer ret = 0; 1768500b4ac9SSundar R Iyer goto out; 1769500b4ac9SSundar R Iyer } 1770500b4ac9SSundar R Iyer } 1771500b4ac9SSundar R Iyer 1772414c70cbSLiam Girdwood /* constraints check */ 1773414c70cbSLiam Girdwood ret = regulator_check_mode(rdev, mode); 1774414c70cbSLiam Girdwood if (ret < 0) 1775414c70cbSLiam Girdwood goto out; 1776414c70cbSLiam Girdwood 1777414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1778414c70cbSLiam Girdwood out: 1779414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1780414c70cbSLiam Girdwood return ret; 1781414c70cbSLiam Girdwood } 1782414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_mode); 1783414c70cbSLiam Girdwood 1784414c70cbSLiam Girdwood static unsigned int _regulator_get_mode(struct regulator_dev *rdev) 1785414c70cbSLiam Girdwood { 1786414c70cbSLiam Girdwood int ret; 1787414c70cbSLiam Girdwood 1788414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1789414c70cbSLiam Girdwood 1790414c70cbSLiam Girdwood /* sanity check */ 1791414c70cbSLiam Girdwood if (!rdev->desc->ops->get_mode) { 1792414c70cbSLiam Girdwood ret = -EINVAL; 1793414c70cbSLiam Girdwood goto out; 1794414c70cbSLiam Girdwood } 1795414c70cbSLiam Girdwood 1796414c70cbSLiam Girdwood ret = rdev->desc->ops->get_mode(rdev); 1797414c70cbSLiam Girdwood out: 1798414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1799414c70cbSLiam Girdwood return ret; 1800414c70cbSLiam Girdwood } 1801414c70cbSLiam Girdwood 1802414c70cbSLiam Girdwood /** 1803414c70cbSLiam Girdwood * regulator_get_mode - get regulator operating mode 1804414c70cbSLiam Girdwood * @regulator: regulator source 1805414c70cbSLiam Girdwood * 1806414c70cbSLiam Girdwood * Get the current regulator operating mode. 1807414c70cbSLiam Girdwood */ 1808414c70cbSLiam Girdwood unsigned int regulator_get_mode(struct regulator *regulator) 1809414c70cbSLiam Girdwood { 1810414c70cbSLiam Girdwood return _regulator_get_mode(regulator->rdev); 1811414c70cbSLiam Girdwood } 1812414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_mode); 1813414c70cbSLiam Girdwood 1814414c70cbSLiam Girdwood /** 1815414c70cbSLiam Girdwood * regulator_set_optimum_mode - set regulator optimum operating mode 1816414c70cbSLiam Girdwood * @regulator: regulator source 1817414c70cbSLiam Girdwood * @uA_load: load current 1818414c70cbSLiam Girdwood * 1819414c70cbSLiam Girdwood * Notifies the regulator core of a new device load. This is then used by 1820414c70cbSLiam Girdwood * DRMS (if enabled by constraints) to set the most efficient regulator 1821414c70cbSLiam Girdwood * operating mode for the new regulator loading. 1822414c70cbSLiam Girdwood * 1823414c70cbSLiam Girdwood * Consumer devices notify their supply regulator of the maximum power 1824414c70cbSLiam Girdwood * they will require (can be taken from device datasheet in the power 1825414c70cbSLiam Girdwood * consumption tables) when they change operational status and hence power 1826414c70cbSLiam Girdwood * state. Examples of operational state changes that can affect power 1827414c70cbSLiam Girdwood * consumption are :- 1828414c70cbSLiam Girdwood * 1829414c70cbSLiam Girdwood * o Device is opened / closed. 1830414c70cbSLiam Girdwood * o Device I/O is about to begin or has just finished. 1831414c70cbSLiam Girdwood * o Device is idling in between work. 1832414c70cbSLiam Girdwood * 1833414c70cbSLiam Girdwood * This information is also exported via sysfs to userspace. 1834414c70cbSLiam Girdwood * 1835414c70cbSLiam Girdwood * DRMS will sum the total requested load on the regulator and change 1836414c70cbSLiam Girdwood * to the most efficient operating mode if platform constraints allow. 1837414c70cbSLiam Girdwood * 1838414c70cbSLiam Girdwood * Returns the new regulator mode or error. 1839414c70cbSLiam Girdwood */ 1840414c70cbSLiam Girdwood int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) 1841414c70cbSLiam Girdwood { 1842414c70cbSLiam Girdwood struct regulator_dev *rdev = regulator->rdev; 1843414c70cbSLiam Girdwood struct regulator *consumer; 1844414c70cbSLiam Girdwood int ret, output_uV, input_uV, total_uA_load = 0; 1845414c70cbSLiam Girdwood unsigned int mode; 1846414c70cbSLiam Girdwood 1847414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 1848414c70cbSLiam Girdwood 1849414c70cbSLiam Girdwood regulator->uA_load = uA_load; 1850414c70cbSLiam Girdwood ret = regulator_check_drms(rdev); 1851414c70cbSLiam Girdwood if (ret < 0) 1852414c70cbSLiam Girdwood goto out; 1853414c70cbSLiam Girdwood ret = -EINVAL; 1854414c70cbSLiam Girdwood 1855414c70cbSLiam Girdwood /* sanity check */ 1856414c70cbSLiam Girdwood if (!rdev->desc->ops->get_optimum_mode) 1857414c70cbSLiam Girdwood goto out; 1858414c70cbSLiam Girdwood 1859414c70cbSLiam Girdwood /* get output voltage */ 1860414c70cbSLiam Girdwood output_uV = rdev->desc->ops->get_voltage(rdev); 1861414c70cbSLiam Girdwood if (output_uV <= 0) { 1862414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid output voltage found for %s\n", 18631083c393SMark Brown __func__, rdev_get_name(rdev)); 1864414c70cbSLiam Girdwood goto out; 1865414c70cbSLiam Girdwood } 1866414c70cbSLiam Girdwood 1867414c70cbSLiam Girdwood /* get input voltage */ 1868414c70cbSLiam Girdwood if (rdev->supply && rdev->supply->desc->ops->get_voltage) 1869414c70cbSLiam Girdwood input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply); 1870414c70cbSLiam Girdwood else 1871414c70cbSLiam Girdwood input_uV = rdev->constraints->input_uV; 1872414c70cbSLiam Girdwood if (input_uV <= 0) { 1873414c70cbSLiam Girdwood printk(KERN_ERR "%s: invalid input voltage found for %s\n", 18741083c393SMark Brown __func__, rdev_get_name(rdev)); 1875414c70cbSLiam Girdwood goto out; 1876414c70cbSLiam Girdwood } 1877414c70cbSLiam Girdwood 1878414c70cbSLiam Girdwood /* calc total requested load for this regulator */ 1879414c70cbSLiam Girdwood list_for_each_entry(consumer, &rdev->consumer_list, list) 1880414c70cbSLiam Girdwood total_uA_load += consumer->uA_load; 1881414c70cbSLiam Girdwood 1882414c70cbSLiam Girdwood mode = rdev->desc->ops->get_optimum_mode(rdev, 1883414c70cbSLiam Girdwood input_uV, output_uV, 1884414c70cbSLiam Girdwood total_uA_load); 1885e573520bSDavid Brownell ret = regulator_check_mode(rdev, mode); 1886e573520bSDavid Brownell if (ret < 0) { 1887414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to get optimum mode for %s @" 18881083c393SMark Brown " %d uA %d -> %d uV\n", __func__, rdev_get_name(rdev), 1889414c70cbSLiam Girdwood total_uA_load, input_uV, output_uV); 1890414c70cbSLiam Girdwood goto out; 1891414c70cbSLiam Girdwood } 1892414c70cbSLiam Girdwood 1893414c70cbSLiam Girdwood ret = rdev->desc->ops->set_mode(rdev, mode); 1894e573520bSDavid Brownell if (ret < 0) { 1895414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n", 18961083c393SMark Brown __func__, mode, rdev_get_name(rdev)); 1897414c70cbSLiam Girdwood goto out; 1898414c70cbSLiam Girdwood } 1899414c70cbSLiam Girdwood ret = mode; 1900414c70cbSLiam Girdwood out: 1901414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 1902414c70cbSLiam Girdwood return ret; 1903414c70cbSLiam Girdwood } 1904414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_optimum_mode); 1905414c70cbSLiam Girdwood 1906414c70cbSLiam Girdwood /** 1907414c70cbSLiam Girdwood * regulator_register_notifier - register regulator event notifier 1908414c70cbSLiam Girdwood * @regulator: regulator source 190969279fb9SMark Brown * @nb: notifier block 1910414c70cbSLiam Girdwood * 1911414c70cbSLiam Girdwood * Register notifier block to receive regulator events. 1912414c70cbSLiam Girdwood */ 1913414c70cbSLiam Girdwood int regulator_register_notifier(struct regulator *regulator, 1914414c70cbSLiam Girdwood struct notifier_block *nb) 1915414c70cbSLiam Girdwood { 1916414c70cbSLiam Girdwood return blocking_notifier_chain_register(®ulator->rdev->notifier, 1917414c70cbSLiam Girdwood nb); 1918414c70cbSLiam Girdwood } 1919414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register_notifier); 1920414c70cbSLiam Girdwood 1921414c70cbSLiam Girdwood /** 1922414c70cbSLiam Girdwood * regulator_unregister_notifier - unregister regulator event notifier 1923414c70cbSLiam Girdwood * @regulator: regulator source 192469279fb9SMark Brown * @nb: notifier block 1925414c70cbSLiam Girdwood * 1926414c70cbSLiam Girdwood * Unregister regulator event notifier block. 1927414c70cbSLiam Girdwood */ 1928414c70cbSLiam Girdwood int regulator_unregister_notifier(struct regulator *regulator, 1929414c70cbSLiam Girdwood struct notifier_block *nb) 1930414c70cbSLiam Girdwood { 1931414c70cbSLiam Girdwood return blocking_notifier_chain_unregister(®ulator->rdev->notifier, 1932414c70cbSLiam Girdwood nb); 1933414c70cbSLiam Girdwood } 1934414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister_notifier); 1935414c70cbSLiam Girdwood 1936b136fb44SJonathan Cameron /* notify regulator consumers and downstream regulator consumers. 1937b136fb44SJonathan Cameron * Note mutex must be held by caller. 1938b136fb44SJonathan Cameron */ 1939414c70cbSLiam Girdwood static void _notifier_call_chain(struct regulator_dev *rdev, 1940414c70cbSLiam Girdwood unsigned long event, void *data) 1941414c70cbSLiam Girdwood { 1942414c70cbSLiam Girdwood struct regulator_dev *_rdev; 1943414c70cbSLiam Girdwood 1944414c70cbSLiam Girdwood /* call rdev chain first */ 1945414c70cbSLiam Girdwood blocking_notifier_call_chain(&rdev->notifier, event, NULL); 1946414c70cbSLiam Girdwood 1947414c70cbSLiam Girdwood /* now notify regulator we supply */ 1948b136fb44SJonathan Cameron list_for_each_entry(_rdev, &rdev->supply_list, slist) { 1949b136fb44SJonathan Cameron mutex_lock(&_rdev->mutex); 1950414c70cbSLiam Girdwood _notifier_call_chain(_rdev, event, data); 1951b136fb44SJonathan Cameron mutex_unlock(&_rdev->mutex); 1952b136fb44SJonathan Cameron } 1953414c70cbSLiam Girdwood } 1954414c70cbSLiam Girdwood 1955414c70cbSLiam Girdwood /** 1956414c70cbSLiam Girdwood * regulator_bulk_get - get multiple regulator consumers 1957414c70cbSLiam Girdwood * 1958414c70cbSLiam Girdwood * @dev: Device to supply 1959414c70cbSLiam Girdwood * @num_consumers: Number of consumers to register 1960414c70cbSLiam Girdwood * @consumers: Configuration of consumers; clients are stored here. 1961414c70cbSLiam Girdwood * 1962414c70cbSLiam Girdwood * @return 0 on success, an errno on failure. 1963414c70cbSLiam Girdwood * 1964414c70cbSLiam Girdwood * This helper function allows drivers to get several regulator 1965414c70cbSLiam Girdwood * consumers in one operation. If any of the regulators cannot be 1966414c70cbSLiam Girdwood * acquired then any regulators that were allocated will be freed 1967414c70cbSLiam Girdwood * before returning to the caller. 1968414c70cbSLiam Girdwood */ 1969414c70cbSLiam Girdwood int regulator_bulk_get(struct device *dev, int num_consumers, 1970414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 1971414c70cbSLiam Girdwood { 1972414c70cbSLiam Girdwood int i; 1973414c70cbSLiam Girdwood int ret; 1974414c70cbSLiam Girdwood 1975414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) 1976414c70cbSLiam Girdwood consumers[i].consumer = NULL; 1977414c70cbSLiam Girdwood 1978414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 1979414c70cbSLiam Girdwood consumers[i].consumer = regulator_get(dev, 1980414c70cbSLiam Girdwood consumers[i].supply); 1981414c70cbSLiam Girdwood if (IS_ERR(consumers[i].consumer)) { 1982414c70cbSLiam Girdwood ret = PTR_ERR(consumers[i].consumer); 19835b307627SMark Brown dev_err(dev, "Failed to get supply '%s': %d\n", 19845b307627SMark Brown consumers[i].supply, ret); 1985414c70cbSLiam Girdwood consumers[i].consumer = NULL; 1986414c70cbSLiam Girdwood goto err; 1987414c70cbSLiam Girdwood } 1988414c70cbSLiam Girdwood } 1989414c70cbSLiam Girdwood 1990414c70cbSLiam Girdwood return 0; 1991414c70cbSLiam Girdwood 1992414c70cbSLiam Girdwood err: 1993414c70cbSLiam Girdwood for (i = 0; i < num_consumers && consumers[i].consumer; i++) 1994414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 1995414c70cbSLiam Girdwood 1996414c70cbSLiam Girdwood return ret; 1997414c70cbSLiam Girdwood } 1998414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_get); 1999414c70cbSLiam Girdwood 2000414c70cbSLiam Girdwood /** 2001414c70cbSLiam Girdwood * regulator_bulk_enable - enable multiple regulator consumers 2002414c70cbSLiam Girdwood * 2003414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2004414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2005414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2006414c70cbSLiam Girdwood * 2007414c70cbSLiam Girdwood * This convenience API allows consumers to enable multiple regulator 2008414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2009414c70cbSLiam Girdwood * then any others that were enabled will be disabled again prior to 2010414c70cbSLiam Girdwood * return. 2011414c70cbSLiam Girdwood */ 2012414c70cbSLiam Girdwood int regulator_bulk_enable(int num_consumers, 2013414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2014414c70cbSLiam Girdwood { 2015414c70cbSLiam Girdwood int i; 2016414c70cbSLiam Girdwood int ret; 2017414c70cbSLiam Girdwood 2018414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2019414c70cbSLiam Girdwood ret = regulator_enable(consumers[i].consumer); 2020414c70cbSLiam Girdwood if (ret != 0) 2021414c70cbSLiam Girdwood goto err; 2022414c70cbSLiam Girdwood } 2023414c70cbSLiam Girdwood 2024414c70cbSLiam Girdwood return 0; 2025414c70cbSLiam Girdwood 2026414c70cbSLiam Girdwood err: 20275b307627SMark Brown printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret); 2028eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2029414c70cbSLiam Girdwood regulator_disable(consumers[i].consumer); 2030414c70cbSLiam Girdwood 2031414c70cbSLiam Girdwood return ret; 2032414c70cbSLiam Girdwood } 2033414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_enable); 2034414c70cbSLiam Girdwood 2035414c70cbSLiam Girdwood /** 2036414c70cbSLiam Girdwood * regulator_bulk_disable - disable multiple regulator consumers 2037414c70cbSLiam Girdwood * 2038414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2039414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2040414c70cbSLiam Girdwood * @return 0 on success, an errno on failure 2041414c70cbSLiam Girdwood * 2042414c70cbSLiam Girdwood * This convenience API allows consumers to disable multiple regulator 2043414c70cbSLiam Girdwood * clients in a single API call. If any consumers cannot be enabled 2044414c70cbSLiam Girdwood * then any others that were disabled will be disabled again prior to 2045414c70cbSLiam Girdwood * return. 2046414c70cbSLiam Girdwood */ 2047414c70cbSLiam Girdwood int regulator_bulk_disable(int num_consumers, 2048414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2049414c70cbSLiam Girdwood { 2050414c70cbSLiam Girdwood int i; 2051414c70cbSLiam Girdwood int ret; 2052414c70cbSLiam Girdwood 2053414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2054414c70cbSLiam Girdwood ret = regulator_disable(consumers[i].consumer); 2055414c70cbSLiam Girdwood if (ret != 0) 2056414c70cbSLiam Girdwood goto err; 2057414c70cbSLiam Girdwood } 2058414c70cbSLiam Girdwood 2059414c70cbSLiam Girdwood return 0; 2060414c70cbSLiam Girdwood 2061414c70cbSLiam Girdwood err: 20625b307627SMark Brown printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply, 20635b307627SMark Brown ret); 2064eb143ac1SLars-Peter Clausen for (--i; i >= 0; --i) 2065414c70cbSLiam Girdwood regulator_enable(consumers[i].consumer); 2066414c70cbSLiam Girdwood 2067414c70cbSLiam Girdwood return ret; 2068414c70cbSLiam Girdwood } 2069414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_disable); 2070414c70cbSLiam Girdwood 2071414c70cbSLiam Girdwood /** 2072414c70cbSLiam Girdwood * regulator_bulk_free - free multiple regulator consumers 2073414c70cbSLiam Girdwood * 2074414c70cbSLiam Girdwood * @num_consumers: Number of consumers 2075414c70cbSLiam Girdwood * @consumers: Consumer data; clients are stored here. 2076414c70cbSLiam Girdwood * 2077414c70cbSLiam Girdwood * This convenience API allows consumers to free multiple regulator 2078414c70cbSLiam Girdwood * clients in a single API call. 2079414c70cbSLiam Girdwood */ 2080414c70cbSLiam Girdwood void regulator_bulk_free(int num_consumers, 2081414c70cbSLiam Girdwood struct regulator_bulk_data *consumers) 2082414c70cbSLiam Girdwood { 2083414c70cbSLiam Girdwood int i; 2084414c70cbSLiam Girdwood 2085414c70cbSLiam Girdwood for (i = 0; i < num_consumers; i++) { 2086414c70cbSLiam Girdwood regulator_put(consumers[i].consumer); 2087414c70cbSLiam Girdwood consumers[i].consumer = NULL; 2088414c70cbSLiam Girdwood } 2089414c70cbSLiam Girdwood } 2090414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_bulk_free); 2091414c70cbSLiam Girdwood 2092414c70cbSLiam Girdwood /** 2093414c70cbSLiam Girdwood * regulator_notifier_call_chain - call regulator event notifier 209469279fb9SMark Brown * @rdev: regulator source 2095414c70cbSLiam Girdwood * @event: notifier block 209669279fb9SMark Brown * @data: callback-specific data. 2097414c70cbSLiam Girdwood * 2098414c70cbSLiam Girdwood * Called by regulator drivers to notify clients a regulator event has 2099414c70cbSLiam Girdwood * occurred. We also notify regulator clients downstream. 2100b136fb44SJonathan Cameron * Note lock must be held by caller. 2101414c70cbSLiam Girdwood */ 2102414c70cbSLiam Girdwood int regulator_notifier_call_chain(struct regulator_dev *rdev, 2103414c70cbSLiam Girdwood unsigned long event, void *data) 2104414c70cbSLiam Girdwood { 2105414c70cbSLiam Girdwood _notifier_call_chain(rdev, event, data); 2106414c70cbSLiam Girdwood return NOTIFY_DONE; 2107414c70cbSLiam Girdwood 2108414c70cbSLiam Girdwood } 2109414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_notifier_call_chain); 2110414c70cbSLiam Girdwood 2111be721979SMark Brown /** 2112be721979SMark Brown * regulator_mode_to_status - convert a regulator mode into a status 2113be721979SMark Brown * 2114be721979SMark Brown * @mode: Mode to convert 2115be721979SMark Brown * 2116be721979SMark Brown * Convert a regulator mode into a status. 2117be721979SMark Brown */ 2118be721979SMark Brown int regulator_mode_to_status(unsigned int mode) 2119be721979SMark Brown { 2120be721979SMark Brown switch (mode) { 2121be721979SMark Brown case REGULATOR_MODE_FAST: 2122be721979SMark Brown return REGULATOR_STATUS_FAST; 2123be721979SMark Brown case REGULATOR_MODE_NORMAL: 2124be721979SMark Brown return REGULATOR_STATUS_NORMAL; 2125be721979SMark Brown case REGULATOR_MODE_IDLE: 2126be721979SMark Brown return REGULATOR_STATUS_IDLE; 2127be721979SMark Brown case REGULATOR_STATUS_STANDBY: 2128be721979SMark Brown return REGULATOR_STATUS_STANDBY; 2129be721979SMark Brown default: 2130be721979SMark Brown return 0; 2131be721979SMark Brown } 2132be721979SMark Brown } 2133be721979SMark Brown EXPORT_SYMBOL_GPL(regulator_mode_to_status); 2134be721979SMark Brown 21357ad68e2fSDavid Brownell /* 21367ad68e2fSDavid Brownell * To avoid cluttering sysfs (and memory) with useless state, only 21377ad68e2fSDavid Brownell * create attributes that can be meaningfully displayed. 21387ad68e2fSDavid Brownell */ 21397ad68e2fSDavid Brownell static int add_regulator_attributes(struct regulator_dev *rdev) 21407ad68e2fSDavid Brownell { 21417ad68e2fSDavid Brownell struct device *dev = &rdev->dev; 21427ad68e2fSDavid Brownell struct regulator_ops *ops = rdev->desc->ops; 21437ad68e2fSDavid Brownell int status = 0; 21447ad68e2fSDavid Brownell 21457ad68e2fSDavid Brownell /* some attributes need specific methods to be displayed */ 21467ad68e2fSDavid Brownell if (ops->get_voltage) { 21477ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microvolts); 21487ad68e2fSDavid Brownell if (status < 0) 21497ad68e2fSDavid Brownell return status; 21507ad68e2fSDavid Brownell } 21517ad68e2fSDavid Brownell if (ops->get_current_limit) { 21527ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_microamps); 21537ad68e2fSDavid Brownell if (status < 0) 21547ad68e2fSDavid Brownell return status; 21557ad68e2fSDavid Brownell } 21567ad68e2fSDavid Brownell if (ops->get_mode) { 21577ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_opmode); 21587ad68e2fSDavid Brownell if (status < 0) 21597ad68e2fSDavid Brownell return status; 21607ad68e2fSDavid Brownell } 21617ad68e2fSDavid Brownell if (ops->is_enabled) { 21627ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_state); 21637ad68e2fSDavid Brownell if (status < 0) 21647ad68e2fSDavid Brownell return status; 21657ad68e2fSDavid Brownell } 2166853116a1SDavid Brownell if (ops->get_status) { 2167853116a1SDavid Brownell status = device_create_file(dev, &dev_attr_status); 2168853116a1SDavid Brownell if (status < 0) 2169853116a1SDavid Brownell return status; 2170853116a1SDavid Brownell } 21717ad68e2fSDavid Brownell 21727ad68e2fSDavid Brownell /* some attributes are type-specific */ 21737ad68e2fSDavid Brownell if (rdev->desc->type == REGULATOR_CURRENT) { 21747ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_requested_microamps); 21757ad68e2fSDavid Brownell if (status < 0) 21767ad68e2fSDavid Brownell return status; 21777ad68e2fSDavid Brownell } 21787ad68e2fSDavid Brownell 21797ad68e2fSDavid Brownell /* all the other attributes exist to support constraints; 21807ad68e2fSDavid Brownell * don't show them if there are no constraints, or if the 21817ad68e2fSDavid Brownell * relevant supporting methods are missing. 21827ad68e2fSDavid Brownell */ 21837ad68e2fSDavid Brownell if (!rdev->constraints) 21847ad68e2fSDavid Brownell return status; 21857ad68e2fSDavid Brownell 21867ad68e2fSDavid Brownell /* constraints need specific supporting methods */ 21877ad68e2fSDavid Brownell if (ops->set_voltage) { 21887ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microvolts); 21897ad68e2fSDavid Brownell if (status < 0) 21907ad68e2fSDavid Brownell return status; 21917ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microvolts); 21927ad68e2fSDavid Brownell if (status < 0) 21937ad68e2fSDavid Brownell return status; 21947ad68e2fSDavid Brownell } 21957ad68e2fSDavid Brownell if (ops->set_current_limit) { 21967ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_min_microamps); 21977ad68e2fSDavid Brownell if (status < 0) 21987ad68e2fSDavid Brownell return status; 21997ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_max_microamps); 22007ad68e2fSDavid Brownell if (status < 0) 22017ad68e2fSDavid Brownell return status; 22027ad68e2fSDavid Brownell } 22037ad68e2fSDavid Brownell 22047ad68e2fSDavid Brownell /* suspend mode constraints need multiple supporting methods */ 22057ad68e2fSDavid Brownell if (!(ops->set_suspend_enable && ops->set_suspend_disable)) 22067ad68e2fSDavid Brownell return status; 22077ad68e2fSDavid Brownell 22087ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_standby_state); 22097ad68e2fSDavid Brownell if (status < 0) 22107ad68e2fSDavid Brownell return status; 22117ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_mem_state); 22127ad68e2fSDavid Brownell if (status < 0) 22137ad68e2fSDavid Brownell return status; 22147ad68e2fSDavid Brownell status = device_create_file(dev, &dev_attr_suspend_disk_state); 22157ad68e2fSDavid Brownell if (status < 0) 22167ad68e2fSDavid Brownell return status; 22177ad68e2fSDavid Brownell 22187ad68e2fSDavid Brownell if (ops->set_suspend_voltage) { 22197ad68e2fSDavid Brownell status = device_create_file(dev, 22207ad68e2fSDavid Brownell &dev_attr_suspend_standby_microvolts); 22217ad68e2fSDavid Brownell if (status < 0) 22227ad68e2fSDavid Brownell return status; 22237ad68e2fSDavid Brownell status = device_create_file(dev, 22247ad68e2fSDavid Brownell &dev_attr_suspend_mem_microvolts); 22257ad68e2fSDavid Brownell if (status < 0) 22267ad68e2fSDavid Brownell return status; 22277ad68e2fSDavid Brownell status = device_create_file(dev, 22287ad68e2fSDavid Brownell &dev_attr_suspend_disk_microvolts); 22297ad68e2fSDavid Brownell if (status < 0) 22307ad68e2fSDavid Brownell return status; 22317ad68e2fSDavid Brownell } 22327ad68e2fSDavid Brownell 22337ad68e2fSDavid Brownell if (ops->set_suspend_mode) { 22347ad68e2fSDavid Brownell status = device_create_file(dev, 22357ad68e2fSDavid Brownell &dev_attr_suspend_standby_mode); 22367ad68e2fSDavid Brownell if (status < 0) 22377ad68e2fSDavid Brownell return status; 22387ad68e2fSDavid Brownell status = device_create_file(dev, 22397ad68e2fSDavid Brownell &dev_attr_suspend_mem_mode); 22407ad68e2fSDavid Brownell if (status < 0) 22417ad68e2fSDavid Brownell return status; 22427ad68e2fSDavid Brownell status = device_create_file(dev, 22437ad68e2fSDavid Brownell &dev_attr_suspend_disk_mode); 22447ad68e2fSDavid Brownell if (status < 0) 22457ad68e2fSDavid Brownell return status; 22467ad68e2fSDavid Brownell } 22477ad68e2fSDavid Brownell 22487ad68e2fSDavid Brownell return status; 22497ad68e2fSDavid Brownell } 22507ad68e2fSDavid Brownell 2251414c70cbSLiam Girdwood /** 2252414c70cbSLiam Girdwood * regulator_register - register regulator 225369279fb9SMark Brown * @regulator_desc: regulator to register 225469279fb9SMark Brown * @dev: struct device for the regulator 22550527100fSMark Brown * @init_data: platform provided init data, passed through by driver 225669279fb9SMark Brown * @driver_data: private regulator data 2257414c70cbSLiam Girdwood * 2258414c70cbSLiam Girdwood * Called by regulator drivers to register a regulator. 2259414c70cbSLiam Girdwood * Returns 0 on success. 2260414c70cbSLiam Girdwood */ 2261414c70cbSLiam Girdwood struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, 22620527100fSMark Brown struct device *dev, struct regulator_init_data *init_data, 22630527100fSMark Brown void *driver_data) 2264414c70cbSLiam Girdwood { 2265414c70cbSLiam Girdwood static atomic_t regulator_no = ATOMIC_INIT(0); 2266414c70cbSLiam Girdwood struct regulator_dev *rdev; 2267a5766f11SLiam Girdwood int ret, i; 2268414c70cbSLiam Girdwood 2269414c70cbSLiam Girdwood if (regulator_desc == NULL) 2270414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2271414c70cbSLiam Girdwood 2272414c70cbSLiam Girdwood if (regulator_desc->name == NULL || regulator_desc->ops == NULL) 2273414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2274414c70cbSLiam Girdwood 2275cd78dfc6SDiego Liziero if (regulator_desc->type != REGULATOR_VOLTAGE && 2276cd78dfc6SDiego Liziero regulator_desc->type != REGULATOR_CURRENT) 2277414c70cbSLiam Girdwood return ERR_PTR(-EINVAL); 2278414c70cbSLiam Girdwood 227946fabe1eSMark Brown if (!init_data) 228046fabe1eSMark Brown return ERR_PTR(-EINVAL); 228146fabe1eSMark Brown 2282414c70cbSLiam Girdwood rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); 2283414c70cbSLiam Girdwood if (rdev == NULL) 2284414c70cbSLiam Girdwood return ERR_PTR(-ENOMEM); 2285414c70cbSLiam Girdwood 2286414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2287414c70cbSLiam Girdwood 2288414c70cbSLiam Girdwood mutex_init(&rdev->mutex); 2289a5766f11SLiam Girdwood rdev->reg_data = driver_data; 2290414c70cbSLiam Girdwood rdev->owner = regulator_desc->owner; 2291414c70cbSLiam Girdwood rdev->desc = regulator_desc; 2292414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->consumer_list); 2293414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->supply_list); 2294414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->list); 2295414c70cbSLiam Girdwood INIT_LIST_HEAD(&rdev->slist); 2296414c70cbSLiam Girdwood BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); 2297414c70cbSLiam Girdwood 2298a5766f11SLiam Girdwood /* preform any regulator specific init */ 2299a5766f11SLiam Girdwood if (init_data->regulator_init) { 2300a5766f11SLiam Girdwood ret = init_data->regulator_init(rdev->reg_data); 23014fca9545SDavid Brownell if (ret < 0) 23024fca9545SDavid Brownell goto clean; 2303a5766f11SLiam Girdwood } 2304a5766f11SLiam Girdwood 2305a5766f11SLiam Girdwood /* register with sysfs */ 2306a5766f11SLiam Girdwood rdev->dev.class = ®ulator_class; 2307a5766f11SLiam Girdwood rdev->dev.parent = dev; 2308812460a9SKay Sievers dev_set_name(&rdev->dev, "regulator.%d", 2309812460a9SKay Sievers atomic_inc_return(®ulator_no) - 1); 2310a5766f11SLiam Girdwood ret = device_register(&rdev->dev); 2311ad7725cbSVasiliy Kulikov if (ret != 0) { 2312ad7725cbSVasiliy Kulikov put_device(&rdev->dev); 23134fca9545SDavid Brownell goto clean; 2314ad7725cbSVasiliy Kulikov } 2315a5766f11SLiam Girdwood 2316a5766f11SLiam Girdwood dev_set_drvdata(&rdev->dev, rdev); 2317a5766f11SLiam Girdwood 231874f544c1SMike Rapoport /* set regulator constraints */ 231974f544c1SMike Rapoport ret = set_machine_constraints(rdev, &init_data->constraints); 232074f544c1SMike Rapoport if (ret < 0) 232174f544c1SMike Rapoport goto scrub; 232274f544c1SMike Rapoport 23237ad68e2fSDavid Brownell /* add attributes supported by this regulator */ 23247ad68e2fSDavid Brownell ret = add_regulator_attributes(rdev); 23257ad68e2fSDavid Brownell if (ret < 0) 23267ad68e2fSDavid Brownell goto scrub; 23277ad68e2fSDavid Brownell 2328a5766f11SLiam Girdwood /* set supply regulator if it exists */ 23290178f3e2SMark Brown if (init_data->supply_regulator && init_data->supply_regulator_dev) { 23300178f3e2SMark Brown dev_err(dev, 23310178f3e2SMark Brown "Supply regulator specified by both name and dev\n"); 23320178f3e2SMark Brown goto scrub; 23330178f3e2SMark Brown } 23340178f3e2SMark Brown 23350178f3e2SMark Brown if (init_data->supply_regulator) { 23360178f3e2SMark Brown struct regulator_dev *r; 23370178f3e2SMark Brown int found = 0; 23380178f3e2SMark Brown 23390178f3e2SMark Brown list_for_each_entry(r, ®ulator_list, list) { 23400178f3e2SMark Brown if (strcmp(rdev_get_name(r), 23410178f3e2SMark Brown init_data->supply_regulator) == 0) { 23420178f3e2SMark Brown found = 1; 23430178f3e2SMark Brown break; 23440178f3e2SMark Brown } 23450178f3e2SMark Brown } 23460178f3e2SMark Brown 23470178f3e2SMark Brown if (!found) { 23480178f3e2SMark Brown dev_err(dev, "Failed to find supply %s\n", 23490178f3e2SMark Brown init_data->supply_regulator); 23500178f3e2SMark Brown goto scrub; 23510178f3e2SMark Brown } 23520178f3e2SMark Brown 23530178f3e2SMark Brown ret = set_supply(rdev, r); 23540178f3e2SMark Brown if (ret < 0) 23550178f3e2SMark Brown goto scrub; 23560178f3e2SMark Brown } 23570178f3e2SMark Brown 2358a5766f11SLiam Girdwood if (init_data->supply_regulator_dev) { 23590178f3e2SMark Brown dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n"); 2360a5766f11SLiam Girdwood ret = set_supply(rdev, 2361a5766f11SLiam Girdwood dev_get_drvdata(init_data->supply_regulator_dev)); 23624fca9545SDavid Brownell if (ret < 0) 23634fca9545SDavid Brownell goto scrub; 2364a5766f11SLiam Girdwood } 2365a5766f11SLiam Girdwood 2366a5766f11SLiam Girdwood /* add consumers devices */ 2367a5766f11SLiam Girdwood for (i = 0; i < init_data->num_consumer_supplies; i++) { 2368a5766f11SLiam Girdwood ret = set_consumer_device_supply(rdev, 2369a5766f11SLiam Girdwood init_data->consumer_supplies[i].dev, 237040f9244fSMark Brown init_data->consumer_supplies[i].dev_name, 2371a5766f11SLiam Girdwood init_data->consumer_supplies[i].supply); 2372d4033b54SJani Nikula if (ret < 0) 2373d4033b54SJani Nikula goto unset_supplies; 2374a5766f11SLiam Girdwood } 2375a5766f11SLiam Girdwood 2376a5766f11SLiam Girdwood list_add(&rdev->list, ®ulator_list); 2377a5766f11SLiam Girdwood out: 2378414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2379414c70cbSLiam Girdwood return rdev; 23804fca9545SDavid Brownell 2381d4033b54SJani Nikula unset_supplies: 2382d4033b54SJani Nikula unset_regulator_supplies(rdev); 2383d4033b54SJani Nikula 23844fca9545SDavid Brownell scrub: 23854fca9545SDavid Brownell device_unregister(&rdev->dev); 238653032dafSPaul Walmsley /* device core frees rdev */ 238753032dafSPaul Walmsley rdev = ERR_PTR(ret); 238853032dafSPaul Walmsley goto out; 238953032dafSPaul Walmsley 23904fca9545SDavid Brownell clean: 23914fca9545SDavid Brownell kfree(rdev); 23924fca9545SDavid Brownell rdev = ERR_PTR(ret); 23934fca9545SDavid Brownell goto out; 2394414c70cbSLiam Girdwood } 2395414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_register); 2396414c70cbSLiam Girdwood 2397414c70cbSLiam Girdwood /** 2398414c70cbSLiam Girdwood * regulator_unregister - unregister regulator 239969279fb9SMark Brown * @rdev: regulator to unregister 2400414c70cbSLiam Girdwood * 2401414c70cbSLiam Girdwood * Called by regulator drivers to unregister a regulator. 2402414c70cbSLiam Girdwood */ 2403414c70cbSLiam Girdwood void regulator_unregister(struct regulator_dev *rdev) 2404414c70cbSLiam Girdwood { 2405414c70cbSLiam Girdwood if (rdev == NULL) 2406414c70cbSLiam Girdwood return; 2407414c70cbSLiam Girdwood 2408414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 24096bf87d17SMark Brown WARN_ON(rdev->open_count); 24100f1d747bSMike Rapoport unset_regulator_supplies(rdev); 2411414c70cbSLiam Girdwood list_del(&rdev->list); 2412414c70cbSLiam Girdwood if (rdev->supply) 2413414c70cbSLiam Girdwood sysfs_remove_link(&rdev->dev.kobj, "supply"); 2414414c70cbSLiam Girdwood device_unregister(&rdev->dev); 2415414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2416414c70cbSLiam Girdwood } 2417414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_unregister); 2418414c70cbSLiam Girdwood 2419414c70cbSLiam Girdwood /** 2420cf7bbcdfSMark Brown * regulator_suspend_prepare - prepare regulators for system wide suspend 2421414c70cbSLiam Girdwood * @state: system suspend state 2422414c70cbSLiam Girdwood * 2423414c70cbSLiam Girdwood * Configure each regulator with it's suspend operating parameters for state. 2424414c70cbSLiam Girdwood * This will usually be called by machine suspend code prior to supending. 2425414c70cbSLiam Girdwood */ 2426414c70cbSLiam Girdwood int regulator_suspend_prepare(suspend_state_t state) 2427414c70cbSLiam Girdwood { 2428414c70cbSLiam Girdwood struct regulator_dev *rdev; 2429414c70cbSLiam Girdwood int ret = 0; 2430414c70cbSLiam Girdwood 2431414c70cbSLiam Girdwood /* ON is handled by regulator active state */ 2432414c70cbSLiam Girdwood if (state == PM_SUSPEND_ON) 2433414c70cbSLiam Girdwood return -EINVAL; 2434414c70cbSLiam Girdwood 2435414c70cbSLiam Girdwood mutex_lock(®ulator_list_mutex); 2436414c70cbSLiam Girdwood list_for_each_entry(rdev, ®ulator_list, list) { 2437414c70cbSLiam Girdwood 2438414c70cbSLiam Girdwood mutex_lock(&rdev->mutex); 2439414c70cbSLiam Girdwood ret = suspend_prepare(rdev, state); 2440414c70cbSLiam Girdwood mutex_unlock(&rdev->mutex); 2441414c70cbSLiam Girdwood 2442414c70cbSLiam Girdwood if (ret < 0) { 2443414c70cbSLiam Girdwood printk(KERN_ERR "%s: failed to prepare %s\n", 24441083c393SMark Brown __func__, rdev_get_name(rdev)); 2445414c70cbSLiam Girdwood goto out; 2446414c70cbSLiam Girdwood } 2447414c70cbSLiam Girdwood } 2448414c70cbSLiam Girdwood out: 2449414c70cbSLiam Girdwood mutex_unlock(®ulator_list_mutex); 2450414c70cbSLiam Girdwood return ret; 2451414c70cbSLiam Girdwood } 2452414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_suspend_prepare); 2453414c70cbSLiam Girdwood 2454414c70cbSLiam Girdwood /** 2455ca725561SMark Brown * regulator_has_full_constraints - the system has fully specified constraints 2456ca725561SMark Brown * 2457ca725561SMark Brown * Calling this function will cause the regulator API to disable all 2458ca725561SMark Brown * regulators which have a zero use count and don't have an always_on 2459ca725561SMark Brown * constraint in a late_initcall. 2460ca725561SMark Brown * 2461ca725561SMark Brown * The intention is that this will become the default behaviour in a 2462ca725561SMark Brown * future kernel release so users are encouraged to use this facility 2463ca725561SMark Brown * now. 2464ca725561SMark Brown */ 2465ca725561SMark Brown void regulator_has_full_constraints(void) 2466ca725561SMark Brown { 2467ca725561SMark Brown has_full_constraints = 1; 2468ca725561SMark Brown } 2469ca725561SMark Brown EXPORT_SYMBOL_GPL(regulator_has_full_constraints); 2470ca725561SMark Brown 2471ca725561SMark Brown /** 2472688fe99aSMark Brown * regulator_use_dummy_regulator - Provide a dummy regulator when none is found 2473688fe99aSMark Brown * 2474688fe99aSMark Brown * Calling this function will cause the regulator API to provide a 2475688fe99aSMark Brown * dummy regulator to consumers if no physical regulator is found, 2476688fe99aSMark Brown * allowing most consumers to proceed as though a regulator were 2477688fe99aSMark Brown * configured. This allows systems such as those with software 2478688fe99aSMark Brown * controllable regulators for the CPU core only to be brought up more 2479688fe99aSMark Brown * readily. 2480688fe99aSMark Brown */ 2481688fe99aSMark Brown void regulator_use_dummy_regulator(void) 2482688fe99aSMark Brown { 2483688fe99aSMark Brown board_wants_dummy_regulator = true; 2484688fe99aSMark Brown } 2485688fe99aSMark Brown EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator); 2486688fe99aSMark Brown 2487688fe99aSMark Brown /** 2488414c70cbSLiam Girdwood * rdev_get_drvdata - get rdev regulator driver data 248969279fb9SMark Brown * @rdev: regulator 2490414c70cbSLiam Girdwood * 2491414c70cbSLiam Girdwood * Get rdev regulator driver private data. This call can be used in the 2492414c70cbSLiam Girdwood * regulator driver context. 2493414c70cbSLiam Girdwood */ 2494414c70cbSLiam Girdwood void *rdev_get_drvdata(struct regulator_dev *rdev) 2495414c70cbSLiam Girdwood { 2496414c70cbSLiam Girdwood return rdev->reg_data; 2497414c70cbSLiam Girdwood } 2498414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_drvdata); 2499414c70cbSLiam Girdwood 2500414c70cbSLiam Girdwood /** 2501414c70cbSLiam Girdwood * regulator_get_drvdata - get regulator driver data 2502414c70cbSLiam Girdwood * @regulator: regulator 2503414c70cbSLiam Girdwood * 2504414c70cbSLiam Girdwood * Get regulator driver private data. This call can be used in the consumer 2505414c70cbSLiam Girdwood * driver context when non API regulator specific functions need to be called. 2506414c70cbSLiam Girdwood */ 2507414c70cbSLiam Girdwood void *regulator_get_drvdata(struct regulator *regulator) 2508414c70cbSLiam Girdwood { 2509414c70cbSLiam Girdwood return regulator->rdev->reg_data; 2510414c70cbSLiam Girdwood } 2511414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_drvdata); 2512414c70cbSLiam Girdwood 2513414c70cbSLiam Girdwood /** 2514414c70cbSLiam Girdwood * regulator_set_drvdata - set regulator driver data 2515414c70cbSLiam Girdwood * @regulator: regulator 2516414c70cbSLiam Girdwood * @data: data 2517414c70cbSLiam Girdwood */ 2518414c70cbSLiam Girdwood void regulator_set_drvdata(struct regulator *regulator, void *data) 2519414c70cbSLiam Girdwood { 2520414c70cbSLiam Girdwood regulator->rdev->reg_data = data; 2521414c70cbSLiam Girdwood } 2522414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(regulator_set_drvdata); 2523414c70cbSLiam Girdwood 2524414c70cbSLiam Girdwood /** 2525414c70cbSLiam Girdwood * regulator_get_id - get regulator ID 252669279fb9SMark Brown * @rdev: regulator 2527414c70cbSLiam Girdwood */ 2528414c70cbSLiam Girdwood int rdev_get_id(struct regulator_dev *rdev) 2529414c70cbSLiam Girdwood { 2530414c70cbSLiam Girdwood return rdev->desc->id; 2531414c70cbSLiam Girdwood } 2532414c70cbSLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_id); 2533414c70cbSLiam Girdwood 2534a5766f11SLiam Girdwood struct device *rdev_get_dev(struct regulator_dev *rdev) 2535a5766f11SLiam Girdwood { 2536a5766f11SLiam Girdwood return &rdev->dev; 2537a5766f11SLiam Girdwood } 2538a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(rdev_get_dev); 2539a5766f11SLiam Girdwood 2540a5766f11SLiam Girdwood void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data) 2541a5766f11SLiam Girdwood { 2542a5766f11SLiam Girdwood return reg_init_data->driver_data; 2543a5766f11SLiam Girdwood } 2544a5766f11SLiam Girdwood EXPORT_SYMBOL_GPL(regulator_get_init_drvdata); 2545a5766f11SLiam Girdwood 2546414c70cbSLiam Girdwood static int __init regulator_init(void) 2547414c70cbSLiam Girdwood { 254834abbd68SMark Brown int ret; 254934abbd68SMark Brown 2550414c70cbSLiam Girdwood printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION); 255134abbd68SMark Brown 255234abbd68SMark Brown ret = class_register(®ulator_class); 255334abbd68SMark Brown 255434abbd68SMark Brown regulator_dummy_init(); 255534abbd68SMark Brown 255634abbd68SMark Brown return ret; 2557414c70cbSLiam Girdwood } 2558414c70cbSLiam Girdwood 2559414c70cbSLiam Girdwood /* init early to allow our consumers to complete system booting */ 2560414c70cbSLiam Girdwood core_initcall(regulator_init); 2561ca725561SMark Brown 2562ca725561SMark Brown static int __init regulator_init_complete(void) 2563ca725561SMark Brown { 2564ca725561SMark Brown struct regulator_dev *rdev; 2565ca725561SMark Brown struct regulator_ops *ops; 2566ca725561SMark Brown struct regulation_constraints *c; 2567ca725561SMark Brown int enabled, ret; 2568ca725561SMark Brown const char *name; 2569ca725561SMark Brown 2570ca725561SMark Brown mutex_lock(®ulator_list_mutex); 2571ca725561SMark Brown 2572ca725561SMark Brown /* If we have a full configuration then disable any regulators 2573ca725561SMark Brown * which are not in use or always_on. This will become the 2574ca725561SMark Brown * default behaviour in the future. 2575ca725561SMark Brown */ 2576ca725561SMark Brown list_for_each_entry(rdev, ®ulator_list, list) { 2577ca725561SMark Brown ops = rdev->desc->ops; 2578ca725561SMark Brown c = rdev->constraints; 2579ca725561SMark Brown 25801083c393SMark Brown name = rdev_get_name(rdev); 2581ca725561SMark Brown 2582f25e0b4fSMark Brown if (!ops->disable || (c && c->always_on)) 2583ca725561SMark Brown continue; 2584ca725561SMark Brown 2585ca725561SMark Brown mutex_lock(&rdev->mutex); 2586ca725561SMark Brown 2587ca725561SMark Brown if (rdev->use_count) 2588ca725561SMark Brown goto unlock; 2589ca725561SMark Brown 2590ca725561SMark Brown /* If we can't read the status assume it's on. */ 2591ca725561SMark Brown if (ops->is_enabled) 2592ca725561SMark Brown enabled = ops->is_enabled(rdev); 2593ca725561SMark Brown else 2594ca725561SMark Brown enabled = 1; 2595ca725561SMark Brown 2596ca725561SMark Brown if (!enabled) 2597ca725561SMark Brown goto unlock; 2598ca725561SMark Brown 2599ca725561SMark Brown if (has_full_constraints) { 2600ca725561SMark Brown /* We log since this may kill the system if it 2601ca725561SMark Brown * goes wrong. */ 2602ca725561SMark Brown printk(KERN_INFO "%s: disabling %s\n", 2603ca725561SMark Brown __func__, name); 2604ca725561SMark Brown ret = ops->disable(rdev); 2605ca725561SMark Brown if (ret != 0) { 2606ca725561SMark Brown printk(KERN_ERR 2607ca725561SMark Brown "%s: couldn't disable %s: %d\n", 2608ca725561SMark Brown __func__, name, ret); 2609ca725561SMark Brown } 2610ca725561SMark Brown } else { 2611ca725561SMark Brown /* The intention is that in future we will 2612ca725561SMark Brown * assume that full constraints are provided 2613ca725561SMark Brown * so warn even if we aren't going to do 2614ca725561SMark Brown * anything here. 2615ca725561SMark Brown */ 2616ca725561SMark Brown printk(KERN_WARNING 2617ca725561SMark Brown "%s: incomplete constraints, leaving %s on\n", 2618ca725561SMark Brown __func__, name); 2619ca725561SMark Brown } 2620ca725561SMark Brown 2621ca725561SMark Brown unlock: 2622ca725561SMark Brown mutex_unlock(&rdev->mutex); 2623ca725561SMark Brown } 2624ca725561SMark Brown 2625ca725561SMark Brown mutex_unlock(®ulator_list_mutex); 2626ca725561SMark Brown 2627ca725561SMark Brown return 0; 2628ca725561SMark Brown } 2629ca725561SMark Brown late_initcall(regulator_init_complete); 2630