/* * core.c -- Voltage/Current Regulator framework. * * Copyright 2007, 2008 Wolfson Microelectronics PLC. * Copyright 2008 SlimLogic Ltd. * * Author: Liam Girdwood * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define CREATE_TRACE_POINTS #include #include "dummy.h" #include "internal.h" #define rdev_crit(rdev, fmt, ...) \ pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) #define rdev_err(rdev, fmt, ...) \ pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) #define rdev_warn(rdev, fmt, ...) \ pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) #define rdev_info(rdev, fmt, ...) \ pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) #define rdev_dbg(rdev, fmt, ...) \ pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__) static DEFINE_MUTEX(regulator_list_mutex); static LIST_HEAD(regulator_list); static LIST_HEAD(regulator_map_list); static LIST_HEAD(regulator_ena_gpio_list); static LIST_HEAD(regulator_supply_alias_list); static bool has_full_constraints; static struct dentry *debugfs_root; /* * struct regulator_map * * Used to provide symbolic supply names to devices. */ struct regulator_map { struct list_head list; const char *dev_name; /* The dev_name() for the consumer */ const char *supply; struct regulator_dev *regulator; }; /* * struct regulator_enable_gpio * * Management for shared enable GPIO pin */ struct regulator_enable_gpio { struct list_head list; struct gpio_desc *gpiod; u32 enable_count; /* a number of enabled shared GPIO */ u32 request_count; /* a number of requested shared GPIO */ unsigned int ena_gpio_invert:1; }; /* * struct regulator_supply_alias * * Used to map lookups for a supply onto an alternative device. */ struct regulator_supply_alias { struct list_head list; struct device *src_dev; const char *src_supply; struct device *alias_dev; const char *alias_supply; }; static int _regulator_is_enabled(struct regulator_dev *rdev); static int _regulator_disable(struct regulator_dev *rdev); static int _regulator_get_voltage(struct regulator_dev *rdev); static int _regulator_get_current_limit(struct regulator_dev *rdev); static unsigned int _regulator_get_mode(struct regulator_dev *rdev); static int _notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data); static int _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV); static struct regulator *create_regulator(struct regulator_dev *rdev, struct device *dev, const char *supply_name); static const char *rdev_get_name(struct regulator_dev *rdev) { if (rdev->constraints && rdev->constraints->name) return rdev->constraints->name; else if (rdev->desc->name) return rdev->desc->name; else return ""; } static bool have_full_constraints(void) { return has_full_constraints || of_have_populated_dt(); } /** * of_get_regulator - get a regulator device node based on supply name * @dev: Device pointer for the consumer (of regulator) device * @supply: regulator supply name * * Extract the regulator device node corresponding to the supply name. * returns the device node corresponding to the regulator if found, else * returns NULL. */ static struct device_node *of_get_regulator(struct device *dev, const char *supply) { struct device_node *regnode = NULL; char prop_name[32]; /* 32 is max size of property name */ dev_dbg(dev, "Looking up %s-supply from device tree\n", supply); snprintf(prop_name, 32, "%s-supply", supply); regnode = of_parse_phandle(dev->of_node, prop_name, 0); if (!regnode) { dev_dbg(dev, "Looking up %s property in node %s failed", prop_name, dev->of_node->full_name); return NULL; } return regnode; } static int _regulator_can_change_status(struct regulator_dev *rdev) { if (!rdev->constraints) return 0; if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS) return 1; else return 0; } /* Platform voltage constraint check */ static int regulator_check_voltage(struct regulator_dev *rdev, int *min_uV, int *max_uV) { BUG_ON(*min_uV > *max_uV); if (!rdev->constraints) { rdev_err(rdev, "no constraints\n"); return -ENODEV; } if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { rdev_err(rdev, "operation not allowed\n"); return -EPERM; } if (*max_uV > rdev->constraints->max_uV) *max_uV = rdev->constraints->max_uV; if (*min_uV < rdev->constraints->min_uV) *min_uV = rdev->constraints->min_uV; if (*min_uV > *max_uV) { rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", *min_uV, *max_uV); return -EINVAL; } return 0; } /* Make sure we select a voltage that suits the needs of all * regulator consumers */ static int regulator_check_consumers(struct regulator_dev *rdev, int *min_uV, int *max_uV) { struct regulator *regulator; list_for_each_entry(regulator, &rdev->consumer_list, list) { /* * Assume consumers that didn't say anything are OK * with anything in the constraint range. */ if (!regulator->min_uV && !regulator->max_uV) continue; if (*max_uV > regulator->max_uV) *max_uV = regulator->max_uV; if (*min_uV < regulator->min_uV) *min_uV = regulator->min_uV; } if (*min_uV > *max_uV) { rdev_err(rdev, "Restricting voltage, %u-%uuV\n", *min_uV, *max_uV); return -EINVAL; } return 0; } /* current constraint check */ static int regulator_check_current_limit(struct regulator_dev *rdev, int *min_uA, int *max_uA) { BUG_ON(*min_uA > *max_uA); if (!rdev->constraints) { rdev_err(rdev, "no constraints\n"); return -ENODEV; } if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) { rdev_err(rdev, "operation not allowed\n"); return -EPERM; } if (*max_uA > rdev->constraints->max_uA) *max_uA = rdev->constraints->max_uA; if (*min_uA < rdev->constraints->min_uA) *min_uA = rdev->constraints->min_uA; if (*min_uA > *max_uA) { rdev_err(rdev, "unsupportable current range: %d-%duA\n", *min_uA, *max_uA); return -EINVAL; } return 0; } /* operating mode constraint check */ static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) { switch (*mode) { case REGULATOR_MODE_FAST: case REGULATOR_MODE_NORMAL: case REGULATOR_MODE_IDLE: case REGULATOR_MODE_STANDBY: break; default: rdev_err(rdev, "invalid mode %x specified\n", *mode); return -EINVAL; } if (!rdev->constraints) { rdev_err(rdev, "no constraints\n"); return -ENODEV; } if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) { rdev_err(rdev, "operation not allowed\n"); return -EPERM; } /* The modes are bitmasks, the most power hungry modes having * the lowest values. If the requested mode isn't supported * try higher modes. */ while (*mode) { if (rdev->constraints->valid_modes_mask & *mode) return 0; *mode /= 2; } return -EINVAL; } /* dynamic regulator mode switching constraint check */ static int regulator_check_drms(struct regulator_dev *rdev) { if (!rdev->constraints) { rdev_err(rdev, "no constraints\n"); return -ENODEV; } if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) { rdev_err(rdev, "operation not allowed\n"); return -EPERM; } return 0; } static ssize_t regulator_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); ssize_t ret; mutex_lock(&rdev->mutex); ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev)); mutex_unlock(&rdev->mutex); return ret; } static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL); static ssize_t regulator_uA_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev)); } static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL); static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%s\n", rdev_get_name(rdev)); } static DEVICE_ATTR_RO(name); static ssize_t regulator_print_opmode(char *buf, int mode) { switch (mode) { case REGULATOR_MODE_FAST: return sprintf(buf, "fast\n"); case REGULATOR_MODE_NORMAL: return sprintf(buf, "normal\n"); case REGULATOR_MODE_IDLE: return sprintf(buf, "idle\n"); case REGULATOR_MODE_STANDBY: return sprintf(buf, "standby\n"); } return sprintf(buf, "unknown\n"); } static ssize_t regulator_opmode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return regulator_print_opmode(buf, _regulator_get_mode(rdev)); } static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL); static ssize_t regulator_print_state(char *buf, int state) { if (state > 0) return sprintf(buf, "enabled\n"); else if (state == 0) return sprintf(buf, "disabled\n"); else return sprintf(buf, "unknown\n"); } static ssize_t regulator_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); ssize_t ret; mutex_lock(&rdev->mutex); ret = regulator_print_state(buf, _regulator_is_enabled(rdev)); mutex_unlock(&rdev->mutex); return ret; } static DEVICE_ATTR(state, 0444, regulator_state_show, NULL); static ssize_t regulator_status_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); int status; char *label; status = rdev->desc->ops->get_status(rdev); if (status < 0) return status; switch (status) { case REGULATOR_STATUS_OFF: label = "off"; break; case REGULATOR_STATUS_ON: label = "on"; break; case REGULATOR_STATUS_ERROR: label = "error"; break; case REGULATOR_STATUS_FAST: label = "fast"; break; case REGULATOR_STATUS_NORMAL: label = "normal"; break; case REGULATOR_STATUS_IDLE: label = "idle"; break; case REGULATOR_STATUS_STANDBY: label = "standby"; break; case REGULATOR_STATUS_BYPASS: label = "bypass"; break; case REGULATOR_STATUS_UNDEFINED: label = "undefined"; break; default: return -ERANGE; } return sprintf(buf, "%s\n", label); } static DEVICE_ATTR(status, 0444, regulator_status_show, NULL); static ssize_t regulator_min_uA_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); if (!rdev->constraints) return sprintf(buf, "constraint not defined\n"); return sprintf(buf, "%d\n", rdev->constraints->min_uA); } static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL); static ssize_t regulator_max_uA_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); if (!rdev->constraints) return sprintf(buf, "constraint not defined\n"); return sprintf(buf, "%d\n", rdev->constraints->max_uA); } static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL); static ssize_t regulator_min_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); if (!rdev->constraints) return sprintf(buf, "constraint not defined\n"); return sprintf(buf, "%d\n", rdev->constraints->min_uV); } static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL); static ssize_t regulator_max_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); if (!rdev->constraints) return sprintf(buf, "constraint not defined\n"); return sprintf(buf, "%d\n", rdev->constraints->max_uV); } static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL); static ssize_t regulator_total_uA_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); struct regulator *regulator; int uA = 0; mutex_lock(&rdev->mutex); list_for_each_entry(regulator, &rdev->consumer_list, list) uA += regulator->uA_load; mutex_unlock(&rdev->mutex); return sprintf(buf, "%d\n", uA); } static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL); static ssize_t num_users_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%d\n", rdev->use_count); } static DEVICE_ATTR_RO(num_users); static ssize_t type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); switch (rdev->desc->type) { case REGULATOR_VOLTAGE: return sprintf(buf, "voltage\n"); case REGULATOR_CURRENT: return sprintf(buf, "current\n"); } return sprintf(buf, "unknown\n"); } static DEVICE_ATTR_RO(type); static ssize_t regulator_suspend_mem_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV); } static DEVICE_ATTR(suspend_mem_microvolts, 0444, regulator_suspend_mem_uV_show, NULL); static ssize_t regulator_suspend_disk_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV); } static DEVICE_ATTR(suspend_disk_microvolts, 0444, regulator_suspend_disk_uV_show, NULL); static ssize_t regulator_suspend_standby_uV_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV); } static DEVICE_ATTR(suspend_standby_microvolts, 0444, regulator_suspend_standby_uV_show, NULL); static ssize_t regulator_suspend_mem_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return regulator_print_opmode(buf, rdev->constraints->state_mem.mode); } static DEVICE_ATTR(suspend_mem_mode, 0444, regulator_suspend_mem_mode_show, NULL); static ssize_t regulator_suspend_disk_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return regulator_print_opmode(buf, rdev->constraints->state_disk.mode); } static DEVICE_ATTR(suspend_disk_mode, 0444, regulator_suspend_disk_mode_show, NULL); static ssize_t regulator_suspend_standby_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return regulator_print_opmode(buf, rdev->constraints->state_standby.mode); } static DEVICE_ATTR(suspend_standby_mode, 0444, regulator_suspend_standby_mode_show, NULL); static ssize_t regulator_suspend_mem_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return regulator_print_state(buf, rdev->constraints->state_mem.enabled); } static DEVICE_ATTR(suspend_mem_state, 0444, regulator_suspend_mem_state_show, NULL); static ssize_t regulator_suspend_disk_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return regulator_print_state(buf, rdev->constraints->state_disk.enabled); } static DEVICE_ATTR(suspend_disk_state, 0444, regulator_suspend_disk_state_show, NULL); static ssize_t regulator_suspend_standby_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); return regulator_print_state(buf, rdev->constraints->state_standby.enabled); } static DEVICE_ATTR(suspend_standby_state, 0444, regulator_suspend_standby_state_show, NULL); static ssize_t regulator_bypass_show(struct device *dev, struct device_attribute *attr, char *buf) { struct regulator_dev *rdev = dev_get_drvdata(dev); const char *report; bool bypass; int ret; ret = rdev->desc->ops->get_bypass(rdev, &bypass); if (ret != 0) report = "unknown"; else if (bypass) report = "enabled"; else report = "disabled"; return sprintf(buf, "%s\n", report); } static DEVICE_ATTR(bypass, 0444, regulator_bypass_show, NULL); /* * These are the only attributes are present for all regulators. * Other attributes are a function of regulator functionality. */ static struct attribute *regulator_dev_attrs[] = { &dev_attr_name.attr, &dev_attr_num_users.attr, &dev_attr_type.attr, NULL, }; ATTRIBUTE_GROUPS(regulator_dev); static void regulator_dev_release(struct device *dev) { struct regulator_dev *rdev = dev_get_drvdata(dev); kfree(rdev); } static struct class regulator_class = { .name = "regulator", .dev_release = regulator_dev_release, .dev_groups = regulator_dev_groups, }; /* Calculate the new optimum regulator operating mode based on the new total * consumer load. All locks held by caller */ static void drms_uA_update(struct regulator_dev *rdev) { struct regulator *sibling; int current_uA = 0, output_uV, input_uV, err; unsigned int mode; err = regulator_check_drms(rdev); if (err < 0 || !rdev->desc->ops->get_optimum_mode || (!rdev->desc->ops->get_voltage && !rdev->desc->ops->get_voltage_sel) || !rdev->desc->ops->set_mode) return; /* get output voltage */ output_uV = _regulator_get_voltage(rdev); if (output_uV <= 0) return; /* get input voltage */ input_uV = 0; if (rdev->supply) input_uV = regulator_get_voltage(rdev->supply); if (input_uV <= 0) input_uV = rdev->constraints->input_uV; if (input_uV <= 0) return; /* calc total requested load */ list_for_each_entry(sibling, &rdev->consumer_list, list) current_uA += sibling->uA_load; /* now get the optimum mode for our new total regulator load */ mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV, output_uV, current_uA); /* check the new mode is allowed */ err = regulator_mode_constrain(rdev, &mode); if (err == 0) rdev->desc->ops->set_mode(rdev, mode); } static int suspend_set_state(struct regulator_dev *rdev, struct regulator_state *rstate) { int ret = 0; /* If we have no suspend mode configration don't set anything; * only warn if the driver implements set_suspend_voltage or * set_suspend_mode callback. */ if (!rstate->enabled && !rstate->disabled) { if (rdev->desc->ops->set_suspend_voltage || rdev->desc->ops->set_suspend_mode) rdev_warn(rdev, "No configuration\n"); return 0; } if (rstate->enabled && rstate->disabled) { rdev_err(rdev, "invalid configuration\n"); return -EINVAL; } if (rstate->enabled && rdev->desc->ops->set_suspend_enable) ret = rdev->desc->ops->set_suspend_enable(rdev); else if (rstate->disabled && rdev->desc->ops->set_suspend_disable) ret = rdev->desc->ops->set_suspend_disable(rdev); else /* OK if set_suspend_enable or set_suspend_disable is NULL */ ret = 0; if (ret < 0) { rdev_err(rdev, "failed to enabled/disable\n"); return ret; } if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) { ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV); if (ret < 0) { rdev_err(rdev, "failed to set voltage\n"); return ret; } } if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) { ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode); if (ret < 0) { rdev_err(rdev, "failed to set mode\n"); return ret; } } return ret; } /* locks held by caller */ static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) { if (!rdev->constraints) return -EINVAL; switch (state) { case PM_SUSPEND_STANDBY: return suspend_set_state(rdev, &rdev->constraints->state_standby); case PM_SUSPEND_MEM: return suspend_set_state(rdev, &rdev->constraints->state_mem); case PM_SUSPEND_MAX: return suspend_set_state(rdev, &rdev->constraints->state_disk); default: return -EINVAL; } } static void print_constraints(struct regulator_dev *rdev) { struct regulation_constraints *constraints = rdev->constraints; char buf[80] = ""; int count = 0; int ret; if (constraints->min_uV && constraints->max_uV) { if (constraints->min_uV == constraints->max_uV) count += sprintf(buf + count, "%d mV ", constraints->min_uV / 1000); else count += sprintf(buf + count, "%d <--> %d mV ", constraints->min_uV / 1000, constraints->max_uV / 1000); } if (!constraints->min_uV || constraints->min_uV != constraints->max_uV) { ret = _regulator_get_voltage(rdev); if (ret > 0) count += sprintf(buf + count, "at %d mV ", ret / 1000); } if (constraints->uV_offset) count += sprintf(buf, "%dmV offset ", constraints->uV_offset / 1000); if (constraints->min_uA && constraints->max_uA) { if (constraints->min_uA == constraints->max_uA) count += sprintf(buf + count, "%d mA ", constraints->min_uA / 1000); else count += sprintf(buf + count, "%d <--> %d mA ", constraints->min_uA / 1000, constraints->max_uA / 1000); } if (!constraints->min_uA || constraints->min_uA != constraints->max_uA) { ret = _regulator_get_current_limit(rdev); if (ret > 0) count += sprintf(buf + count, "at %d mA ", ret / 1000); } if (constraints->valid_modes_mask & REGULATOR_MODE_FAST) count += sprintf(buf + count, "fast "); if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL) count += sprintf(buf + count, "normal "); if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE) count += sprintf(buf + count, "idle "); if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY) count += sprintf(buf + count, "standby"); if (!count) sprintf(buf, "no parameters"); rdev_info(rdev, "%s\n", buf); if ((constraints->min_uV != constraints->max_uV) && !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) rdev_warn(rdev, "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n"); } static int machine_constraints_voltage(struct regulator_dev *rdev, struct regulation_constraints *constraints) { const struct regulator_ops *ops = rdev->desc->ops; int ret; /* do we need to apply the constraint voltage */ if (rdev->constraints->apply_uV && rdev->constraints->min_uV == rdev->constraints->max_uV) { int current_uV = _regulator_get_voltage(rdev); if (current_uV < 0) { rdev_err(rdev, "failed to get the current voltage(%d)\n", current_uV); return current_uV; } if (current_uV < rdev->constraints->min_uV || current_uV > rdev->constraints->max_uV) { ret = _regulator_do_set_voltage( rdev, rdev->constraints->min_uV, rdev->constraints->max_uV); if (ret < 0) { rdev_err(rdev, "failed to apply %duV constraint(%d)\n", rdev->constraints->min_uV, ret); return ret; } } } /* constrain machine-level voltage specs to fit * the actual range supported by this regulator. */ if (ops->list_voltage && rdev->desc->n_voltages) { int count = rdev->desc->n_voltages; int i; int min_uV = INT_MAX; int max_uV = INT_MIN; int cmin = constraints->min_uV; int cmax = constraints->max_uV; /* it's safe to autoconfigure fixed-voltage supplies and the constraints are used by list_voltage. */ if (count == 1 && !cmin) { cmin = 1; cmax = INT_MAX; constraints->min_uV = cmin; constraints->max_uV = cmax; } /* voltage constraints are optional */ if ((cmin == 0) && (cmax == 0)) return 0; /* else require explicit machine-level constraints */ if (cmin <= 0 || cmax <= 0 || cmax < cmin) { rdev_err(rdev, "invalid voltage constraints\n"); return -EINVAL; } /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */ for (i = 0; i < count; i++) { int value; value = ops->list_voltage(rdev, i); if (value <= 0) continue; /* maybe adjust [min_uV..max_uV] */ if (value >= cmin && value < min_uV) min_uV = value; if (value <= cmax && value > max_uV) max_uV = value; } /* final: [min_uV..max_uV] valid iff constraints valid */ if (max_uV < min_uV) { rdev_err(rdev, "unsupportable voltage constraints %u-%uuV\n", min_uV, max_uV); return -EINVAL; } /* use regulator's subset of machine constraints */ if (constraints->min_uV < min_uV) { rdev_dbg(rdev, "override min_uV, %d -> %d\n", constraints->min_uV, min_uV); constraints->min_uV = min_uV; } if (constraints->max_uV > max_uV) { rdev_dbg(rdev, "override max_uV, %d -> %d\n", constraints->max_uV, max_uV); constraints->max_uV = max_uV; } } return 0; } static int machine_constraints_current(struct regulator_dev *rdev, struct regulation_constraints *constraints) { const struct regulator_ops *ops = rdev->desc->ops; int ret; if (!constraints->min_uA && !constraints->max_uA) return 0; if (constraints->min_uA > constraints->max_uA) { rdev_err(rdev, "Invalid current constraints\n"); return -EINVAL; } if (!ops->set_current_limit || !ops->get_current_limit) { rdev_warn(rdev, "Operation of current configuration missing\n"); return 0; } /* Set regulator current in constraints range */ ret = ops->set_current_limit(rdev, constraints->min_uA, constraints->max_uA); if (ret < 0) { rdev_err(rdev, "Failed to set current constraint, %d\n", ret); return ret; } return 0; } static int _regulator_do_enable(struct regulator_dev *rdev); /** * set_machine_constraints - sets regulator constraints * @rdev: regulator source * @constraints: constraints to apply * * Allows platform initialisation code to define and constrain * regulator circuits e.g. valid voltage/current ranges, etc. NOTE: * Constraints *must* be set by platform code in order for some * regulator operations to proceed i.e. set_voltage, set_current_limit, * set_mode. */ static int set_machine_constraints(struct regulator_dev *rdev, const struct regulation_constraints *constraints) { int ret = 0; const struct regulator_ops *ops = rdev->desc->ops; if (constraints) rdev->constraints = kmemdup(constraints, sizeof(*constraints), GFP_KERNEL); else rdev->constraints = kzalloc(sizeof(*constraints), GFP_KERNEL); if (!rdev->constraints) return -ENOMEM; ret = machine_constraints_voltage(rdev, rdev->constraints); if (ret != 0) goto out; ret = machine_constraints_current(rdev, rdev->constraints); if (ret != 0) goto out; /* do we need to setup our suspend state */ if (rdev->constraints->initial_state) { ret = suspend_prepare(rdev, rdev->constraints->initial_state); if (ret < 0) { rdev_err(rdev, "failed to set suspend state\n"); goto out; } } if (rdev->constraints->initial_mode) { if (!ops->set_mode) { rdev_err(rdev, "no set_mode operation\n"); ret = -EINVAL; goto out; } ret = ops->set_mode(rdev, rdev->constraints->initial_mode); if (ret < 0) { rdev_err(rdev, "failed to set initial mode: %d\n", ret); goto out; } } /* If the constraints say the regulator should be on at this point * and we have control then make sure it is enabled. */ if (rdev->constraints->always_on || rdev->constraints->boot_on) { ret = _regulator_do_enable(rdev); if (ret < 0 && ret != -EINVAL) { rdev_err(rdev, "failed to enable\n"); goto out; } } if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable) && ops->set_ramp_delay) { ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay); if (ret < 0) { rdev_err(rdev, "failed to set ramp_delay\n"); goto out; } } print_constraints(rdev); return 0; out: kfree(rdev->constraints); rdev->constraints = NULL; return ret; } /** * set_supply - set regulator supply regulator * @rdev: regulator name * @supply_rdev: supply regulator name * * Called by platform initialisation code to set the supply regulator for this * regulator. This ensures that a regulators supply will also be enabled by the * core if it's child is enabled. */ static int set_supply(struct regulator_dev *rdev, struct regulator_dev *supply_rdev) { int err; rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); if (rdev->supply == NULL) { err = -ENOMEM; return err; } supply_rdev->open_count++; return 0; } /** * set_consumer_device_supply - Bind a regulator to a symbolic supply * @rdev: regulator source * @consumer_dev_name: dev_name() string for device supply applies to * @supply: symbolic name for supply * * Allows platform initialisation code to map physical regulator * sources to symbolic names for supplies for use by devices. Devices * should use these symbolic names to request regulators, avoiding the * need to provide board-specific regulator names as platform data. */ static int set_consumer_device_supply(struct regulator_dev *rdev, const char *consumer_dev_name, const char *supply) { struct regulator_map *node; int has_dev; if (supply == NULL) return -EINVAL; if (consumer_dev_name != NULL) has_dev = 1; else has_dev = 0; list_for_each_entry(node, ®ulator_map_list, list) { if (node->dev_name && consumer_dev_name) { if (strcmp(node->dev_name, consumer_dev_name) != 0) continue; } else if (node->dev_name || consumer_dev_name) { continue; } if (strcmp(node->supply, supply) != 0) continue; pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n", consumer_dev_name, dev_name(&node->regulator->dev), node->regulator->desc->name, supply, dev_name(&rdev->dev), rdev_get_name(rdev)); return -EBUSY; } node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL); if (node == NULL) return -ENOMEM; node->regulator = rdev; node->supply = supply; if (has_dev) { node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL); if (node->dev_name == NULL) { kfree(node); return -ENOMEM; } } list_add(&node->list, ®ulator_map_list); return 0; } static void unset_regulator_supplies(struct regulator_dev *rdev) { struct regulator_map *node, *n; list_for_each_entry_safe(node, n, ®ulator_map_list, list) { if (rdev == node->regulator) { list_del(&node->list); kfree(node->dev_name); kfree(node); } } } #define REG_STR_SIZE 64 static struct regulator *create_regulator(struct regulator_dev *rdev, struct device *dev, const char *supply_name) { struct regulator *regulator; char buf[REG_STR_SIZE]; int err, size; regulator = kzalloc(sizeof(*regulator), GFP_KERNEL); if (regulator == NULL) return NULL; mutex_lock(&rdev->mutex); regulator->rdev = rdev; list_add(®ulator->list, &rdev->consumer_list); if (dev) { regulator->dev = dev; /* Add a link to the device sysfs entry */ size = scnprintf(buf, REG_STR_SIZE, "%s-%s", dev->kobj.name, supply_name); if (size >= REG_STR_SIZE) goto overflow_err; regulator->supply_name = kstrdup(buf, GFP_KERNEL); if (regulator->supply_name == NULL) goto overflow_err; err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj, buf); if (err) { rdev_warn(rdev, "could not add device link %s err %d\n", dev->kobj.name, err); /* non-fatal */ } } else { regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); if (regulator->supply_name == NULL) goto overflow_err; } regulator->debugfs = debugfs_create_dir(regulator->supply_name, rdev->debugfs); if (!regulator->debugfs) { rdev_warn(rdev, "Failed to create debugfs directory\n"); } else { debugfs_create_u32("uA_load", 0444, regulator->debugfs, ®ulator->uA_load); debugfs_create_u32("min_uV", 0444, regulator->debugfs, ®ulator->min_uV); debugfs_create_u32("max_uV", 0444, regulator->debugfs, ®ulator->max_uV); } /* * Check now if the regulator is an always on regulator - if * it is then we don't need to do nearly so much work for * enable/disable calls. */ if (!_regulator_can_change_status(rdev) && _regulator_is_enabled(rdev)) regulator->always_on = true; mutex_unlock(&rdev->mutex); return regulator; overflow_err: list_del(®ulator->list); kfree(regulator); mutex_unlock(&rdev->mutex); return NULL; } static int _regulator_get_enable_time(struct regulator_dev *rdev) { if (rdev->constraints && rdev->constraints->enable_time) return rdev->constraints->enable_time; if (!rdev->desc->ops->enable_time) return rdev->desc->enable_time; return rdev->desc->ops->enable_time(rdev); } static struct regulator_supply_alias *regulator_find_supply_alias( struct device *dev, const char *supply) { struct regulator_supply_alias *map; list_for_each_entry(map, ®ulator_supply_alias_list, list) if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0) return map; return NULL; } static void regulator_supply_alias(struct device **dev, const char **supply) { struct regulator_supply_alias *map; map = regulator_find_supply_alias(*dev, *supply); if (map) { dev_dbg(*dev, "Mapping supply %s to %s,%s\n", *supply, map->alias_supply, dev_name(map->alias_dev)); *dev = map->alias_dev; *supply = map->alias_supply; } } static struct regulator_dev *regulator_dev_lookup(struct device *dev, const char *supply, int *ret) { struct regulator_dev *r; struct device_node *node; struct regulator_map *map; const char *devname = NULL; regulator_supply_alias(&dev, &supply); /* first do a dt based lookup */ if (dev && dev->of_node) { node = of_get_regulator(dev, supply); if (node) { list_for_each_entry(r, ®ulator_list, list) if (r->dev.parent && node == r->dev.of_node) return r; *ret = -EPROBE_DEFER; return NULL; } else { /* * If we couldn't even get the node then it's * not just that the device didn't register * yet, there's no node and we'll never * succeed. */ *ret = -ENODEV; } } /* if not found, try doing it non-dt way */ if (dev) devname = dev_name(dev); list_for_each_entry(r, ®ulator_list, list) if (strcmp(rdev_get_name(r), supply) == 0) return r; list_for_each_entry(map, ®ulator_map_list, list) { /* If the mapping has a device set up it must match */ if (map->dev_name && (!devname || strcmp(map->dev_name, devname))) continue; if (strcmp(map->supply, supply) == 0) return map->regulator; } return NULL; } /* Internal regulator request function */ static struct regulator *_regulator_get(struct device *dev, const char *id, bool exclusive, bool allow_dummy) { struct regulator_dev *rdev; struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); const char *devname = NULL; int ret; if (id == NULL) { pr_err("get() with no identifier\n"); return ERR_PTR(-EINVAL); } if (dev) devname = dev_name(dev); if (have_full_constraints()) ret = -ENODEV; else ret = -EPROBE_DEFER; mutex_lock(®ulator_list_mutex); rdev = regulator_dev_lookup(dev, id, &ret); if (rdev) goto found; regulator = ERR_PTR(ret); /* * If we have return value from dev_lookup fail, we do not expect to * succeed, so, quit with appropriate error value */ if (ret && ret != -ENODEV) goto out; if (!devname) devname = "deviceless"; /* * Assume that a regulator is physically present and enabled * even if it isn't hooked up and just provide a dummy. */ if (have_full_constraints() && allow_dummy) { pr_warn("%s supply %s not found, using dummy regulator\n", devname, id); rdev = dummy_regulator_rdev; goto found; /* Don't log an error when called from regulator_get_optional() */ } else if (!have_full_constraints() || exclusive) { dev_warn(dev, "dummy supplies not allowed\n"); } mutex_unlock(®ulator_list_mutex); return regulator; found: if (rdev->exclusive) { regulator = ERR_PTR(-EPERM); goto out; } if (exclusive && rdev->open_count) { regulator = ERR_PTR(-EBUSY); goto out; } if (!try_module_get(rdev->owner)) goto out; regulator = create_regulator(rdev, dev, id); if (regulator == NULL) { regulator = ERR_PTR(-ENOMEM); module_put(rdev->owner); goto out; } rdev->open_count++; if (exclusive) { rdev->exclusive = 1; ret = _regulator_is_enabled(rdev); if (ret > 0) rdev->use_count = 1; else rdev->use_count = 0; } out: mutex_unlock(®ulator_list_mutex); return regulator; } /** * regulator_get - lookup and obtain a reference to a regulator. * @dev: device for regulator "consumer" * @id: Supply name or regulator ID. * * Returns a struct regulator corresponding to the regulator producer, * or IS_ERR() condition containing errno. * * Use of supply names configured via regulator_set_device_supply() is * strongly encouraged. It is recommended that the supply name used * should match the name used for the supply and/or the relevant * device pins in the datasheet. */ struct regulator *regulator_get(struct device *dev, const char *id) { return _regulator_get(dev, id, false, true); } EXPORT_SYMBOL_GPL(regulator_get); /** * regulator_get_exclusive - obtain exclusive access to a regulator. * @dev: device for regulator "consumer" * @id: Supply name or regulator ID. * * Returns a struct regulator corresponding to the regulator producer, * or IS_ERR() condition containing errno. Other consumers will be * unable to obtain this regulator while this reference is held and the * use count for the regulator will be initialised to reflect the current * state of the regulator. * * This is intended for use by consumers which cannot tolerate shared * use of the regulator such as those which need to force the * regulator off for correct operation of the hardware they are * controlling. * * Use of supply names configured via regulator_set_device_supply() is * strongly encouraged. It is recommended that the supply name used * should match the name used for the supply and/or the relevant * device pins in the datasheet. */ struct regulator *regulator_get_exclusive(struct device *dev, const char *id) { return _regulator_get(dev, id, true, false); } EXPORT_SYMBOL_GPL(regulator_get_exclusive); /** * regulator_get_optional - obtain optional access to a regulator. * @dev: device for regulator "consumer" * @id: Supply name or regulator ID. * * Returns a struct regulator corresponding to the regulator producer, * or IS_ERR() condition containing errno. * * This is intended for use by consumers for devices which can have * some supplies unconnected in normal use, such as some MMC devices. * It can allow the regulator core to provide stub supplies for other * supplies requested using normal regulator_get() calls without * disrupting the operation of drivers that can handle absent * supplies. * * Use of supply names configured via regulator_set_device_supply() is * strongly encouraged. It is recommended that the supply name used * should match the name used for the supply and/or the relevant * device pins in the datasheet. */ struct regulator *regulator_get_optional(struct device *dev, const char *id) { return _regulator_get(dev, id, false, false); } EXPORT_SYMBOL_GPL(regulator_get_optional); /* Locks held by regulator_put() */ static void _regulator_put(struct regulator *regulator) { struct regulator_dev *rdev; if (regulator == NULL || IS_ERR(regulator)) return; rdev = regulator->rdev; debugfs_remove_recursive(regulator->debugfs); /* remove any sysfs entries */ if (regulator->dev) sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); kfree(regulator->supply_name); list_del(®ulator->list); kfree(regulator); rdev->open_count--; rdev->exclusive = 0; module_put(rdev->owner); } /** * regulator_put - "free" the regulator source * @regulator: regulator source * * Note: drivers must ensure that all regulator_enable calls made on this * regulator source are balanced by regulator_disable calls prior to calling * this function. */ void regulator_put(struct regulator *regulator) { mutex_lock(®ulator_list_mutex); _regulator_put(regulator); mutex_unlock(®ulator_list_mutex); } EXPORT_SYMBOL_GPL(regulator_put); /** * regulator_register_supply_alias - Provide device alias for supply lookup * * @dev: device that will be given as the regulator "consumer" * @id: Supply name or regulator ID * @alias_dev: device that should be used to lookup the supply * @alias_id: Supply name or regulator ID that should be used to lookup the * supply * * All lookups for id on dev will instead be conducted for alias_id on * alias_dev. */ int regulator_register_supply_alias(struct device *dev, const char *id, struct device *alias_dev, const char *alias_id) { struct regulator_supply_alias *map; map = regulator_find_supply_alias(dev, id); if (map) return -EEXIST; map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); if (!map) return -ENOMEM; map->src_dev = dev; map->src_supply = id; map->alias_dev = alias_dev; map->alias_supply = alias_id; list_add(&map->list, ®ulator_supply_alias_list); pr_info("Adding alias for supply %s,%s -> %s,%s\n", id, dev_name(dev), alias_id, dev_name(alias_dev)); return 0; } EXPORT_SYMBOL_GPL(regulator_register_supply_alias); /** * regulator_unregister_supply_alias - Remove device alias * * @dev: device that will be given as the regulator "consumer" * @id: Supply name or regulator ID * * Remove a lookup alias if one exists for id on dev. */ void regulator_unregister_supply_alias(struct device *dev, const char *id) { struct regulator_supply_alias *map; map = regulator_find_supply_alias(dev, id); if (map) { list_del(&map->list); kfree(map); } } EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); /** * regulator_bulk_register_supply_alias - register multiple aliases * * @dev: device that will be given as the regulator "consumer" * @id: List of supply names or regulator IDs * @alias_dev: device that should be used to lookup the supply * @alias_id: List of supply names or regulator IDs that should be used to * lookup the supply * @num_id: Number of aliases to register * * @return 0 on success, an errno on failure. * * This helper function allows drivers to register several supply * aliases in one operation. If any of the aliases cannot be * registered any aliases that were registered will be removed * before returning to the caller. */ int regulator_bulk_register_supply_alias(struct device *dev, const char *const *id, struct device *alias_dev, const char *const *alias_id, int num_id) { int i; int ret; for (i = 0; i < num_id; ++i) { ret = regulator_register_supply_alias(dev, id[i], alias_dev, alias_id[i]); if (ret < 0) goto err; } return 0; err: dev_err(dev, "Failed to create supply alias %s,%s -> %s,%s\n", id[i], dev_name(dev), alias_id[i], dev_name(alias_dev)); while (--i >= 0) regulator_unregister_supply_alias(dev, id[i]); return ret; } EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias); /** * regulator_bulk_unregister_supply_alias - unregister multiple aliases * * @dev: device that will be given as the regulator "consumer" * @id: List of supply names or regulator IDs * @num_id: Number of aliases to unregister * * This helper function allows drivers to unregister several supply * aliases in one operation. */ void regulator_bulk_unregister_supply_alias(struct device *dev, const char *const *id, int num_id) { int i; for (i = 0; i < num_id; ++i) regulator_unregister_supply_alias(dev, id[i]); } EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias); /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */ static int regulator_ena_gpio_request(struct regulator_dev *rdev, const struct regulator_config *config) { struct regulator_enable_gpio *pin; struct gpio_desc *gpiod; int ret; gpiod = gpio_to_desc(config->ena_gpio); list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { if (pin->gpiod == gpiod) { rdev_dbg(rdev, "GPIO %d is already used\n", config->ena_gpio); goto update_ena_gpio_to_rdev; } } ret = gpio_request_one(config->ena_gpio, GPIOF_DIR_OUT | config->ena_gpio_flags, rdev_get_name(rdev)); if (ret) return ret; pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL); if (pin == NULL) { gpio_free(config->ena_gpio); return -ENOMEM; } pin->gpiod = gpiod; pin->ena_gpio_invert = config->ena_gpio_invert; list_add(&pin->list, ®ulator_ena_gpio_list); update_ena_gpio_to_rdev: pin->request_count++; rdev->ena_pin = pin; return 0; } static void regulator_ena_gpio_free(struct regulator_dev *rdev) { struct regulator_enable_gpio *pin, *n; if (!rdev->ena_pin) return; /* Free the GPIO only in case of no use */ list_for_each_entry_safe(pin, n, ®ulator_ena_gpio_list, list) { if (pin->gpiod == rdev->ena_pin->gpiod) { if (pin->request_count <= 1) { pin->request_count = 0; gpiod_put(pin->gpiod); list_del(&pin->list); kfree(pin); } else { pin->request_count--; } } } } /** * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control * @rdev: regulator_dev structure * @enable: enable GPIO at initial use? * * GPIO is enabled in case of initial use. (enable_count is 0) * GPIO is disabled when it is not shared any more. (enable_count <= 1) */ static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable) { struct regulator_enable_gpio *pin = rdev->ena_pin; if (!pin) return -EINVAL; if (enable) { /* Enable GPIO at initial use */ if (pin->enable_count == 0) gpiod_set_value_cansleep(pin->gpiod, !pin->ena_gpio_invert); pin->enable_count++; } else { if (pin->enable_count > 1) { pin->enable_count--; return 0; } /* Disable GPIO if not used */ if (pin->enable_count <= 1) { gpiod_set_value_cansleep(pin->gpiod, pin->ena_gpio_invert); pin->enable_count = 0; } } return 0; } /** * _regulator_enable_delay - a delay helper function * @delay: time to delay in microseconds * * Delay for the requested amount of time as per the guidelines in: * * Documentation/timers/timers-howto.txt * * The assumption here is that regulators will never be enabled in * atomic context and therefore sleeping functions can be used. */ static void _regulator_enable_delay(unsigned int delay) { unsigned int ms = delay / 1000; unsigned int us = delay % 1000; if (ms > 0) { /* * For small enough values, handle super-millisecond * delays in the usleep_range() call below. */ if (ms < 20) us += ms * 1000; else msleep(ms); } /* * Give the scheduler some room to coalesce with any other * wakeup sources. For delays shorter than 10 us, don't even * bother setting up high-resolution timers and just busy- * loop. */ if (us >= 10) usleep_range(us, us + 100); else udelay(us); } static int _regulator_do_enable(struct regulator_dev *rdev) { int ret, delay; /* Query before enabling in case configuration dependent. */ ret = _regulator_get_enable_time(rdev); if (ret >= 0) { delay = ret; } else { rdev_warn(rdev, "enable_time() failed: %d\n", ret); delay = 0; } trace_regulator_enable(rdev_get_name(rdev)); if (rdev->desc->off_on_delay) { /* if needed, keep a distance of off_on_delay from last time * this regulator was disabled. */ unsigned long start_jiffy = jiffies; unsigned long intended, max_delay, remaining; max_delay = usecs_to_jiffies(rdev->desc->off_on_delay); intended = rdev->last_off_jiffy + max_delay; if (time_before(start_jiffy, intended)) { /* calc remaining jiffies to deal with one-time * timer wrapping. * in case of multiple timer wrapping, either it can be * detected by out-of-range remaining, or it cannot be * detected and we gets a panelty of * _regulator_enable_delay(). */ remaining = intended - start_jiffy; if (remaining <= max_delay) _regulator_enable_delay( jiffies_to_usecs(remaining)); } } if (rdev->ena_pin) { ret = regulator_ena_gpio_ctrl(rdev, true); if (ret < 0) return ret; rdev->ena_gpio_state = 1; } else if (rdev->desc->ops->enable) { ret = rdev->desc->ops->enable(rdev); if (ret < 0) return ret; } else { return -EINVAL; } /* Allow the regulator to ramp; it would be useful to extend * this for bulk operations so that the regulators can ramp * together. */ trace_regulator_enable_delay(rdev_get_name(rdev)); _regulator_enable_delay(delay); trace_regulator_enable_complete(rdev_get_name(rdev)); return 0; } /* locks held by regulator_enable() */ static int _regulator_enable(struct regulator_dev *rdev) { int ret; /* check voltage and requested load before enabling */ if (rdev->constraints && (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) drms_uA_update(rdev); if (rdev->use_count == 0) { /* The regulator may on if it's not switchable or left on */ ret = _regulator_is_enabled(rdev); if (ret == -EINVAL || ret == 0) { if (!_regulator_can_change_status(rdev)) return -EPERM; ret = _regulator_do_enable(rdev); if (ret < 0) return ret; } else if (ret < 0) { rdev_err(rdev, "is_enabled() failed: %d\n", ret); return ret; } /* Fallthrough on positive return values - already enabled */ } rdev->use_count++; return 0; } /** * regulator_enable - enable regulator output * @regulator: regulator source * * Request that the regulator be enabled with the regulator output at * the predefined voltage or current value. Calls to regulator_enable() * must be balanced with calls to regulator_disable(). * * NOTE: the output value can be set by other drivers, boot loader or may be * hardwired in the regulator. */ int regulator_enable(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; int ret = 0; if (regulator->always_on) return 0; if (rdev->supply) { ret = regulator_enable(rdev->supply); if (ret != 0) return ret; } mutex_lock(&rdev->mutex); ret = _regulator_enable(rdev); mutex_unlock(&rdev->mutex); if (ret != 0 && rdev->supply) regulator_disable(rdev->supply); return ret; } EXPORT_SYMBOL_GPL(regulator_enable); static int _regulator_do_disable(struct regulator_dev *rdev) { int ret; trace_regulator_disable(rdev_get_name(rdev)); if (rdev->ena_pin) { ret = regulator_ena_gpio_ctrl(rdev, false); if (ret < 0) return ret; rdev->ena_gpio_state = 0; } else if (rdev->desc->ops->disable) { ret = rdev->desc->ops->disable(rdev); if (ret != 0) return ret; } /* cares about last_off_jiffy only if off_on_delay is required by * device. */ if (rdev->desc->off_on_delay) rdev->last_off_jiffy = jiffies; trace_regulator_disable_complete(rdev_get_name(rdev)); return 0; } /* locks held by regulator_disable() */ static int _regulator_disable(struct regulator_dev *rdev) { int ret = 0; if (WARN(rdev->use_count <= 0, "unbalanced disables for %s\n", rdev_get_name(rdev))) return -EIO; /* are we the last user and permitted to disable ? */ if (rdev->use_count == 1 && (rdev->constraints && !rdev->constraints->always_on)) { /* we are last user */ if (_regulator_can_change_status(rdev)) { ret = _regulator_do_disable(rdev); if (ret < 0) { rdev_err(rdev, "failed to disable\n"); return ret; } _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE, NULL); } rdev->use_count = 0; } else if (rdev->use_count > 1) { if (rdev->constraints && (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) drms_uA_update(rdev); rdev->use_count--; } return ret; } /** * regulator_disable - disable regulator output * @regulator: regulator source * * Disable the regulator output voltage or current. Calls to * regulator_enable() must be balanced with calls to * regulator_disable(). * * NOTE: this will only disable the regulator output if no other consumer * devices have it enabled, the regulator device supports disabling and * machine constraints permit this operation. */ int regulator_disable(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; int ret = 0; if (regulator->always_on) return 0; mutex_lock(&rdev->mutex); ret = _regulator_disable(rdev); mutex_unlock(&rdev->mutex); if (ret == 0 && rdev->supply) regulator_disable(rdev->supply); return ret; } EXPORT_SYMBOL_GPL(regulator_disable); /* locks held by regulator_force_disable() */ static int _regulator_force_disable(struct regulator_dev *rdev) { int ret = 0; ret = _regulator_do_disable(rdev); if (ret < 0) { rdev_err(rdev, "failed to force disable\n"); return ret; } _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE | REGULATOR_EVENT_DISABLE, NULL); return 0; } /** * regulator_force_disable - force disable regulator output * @regulator: regulator source * * Forcibly disable the regulator output voltage or current. * NOTE: this *will* disable the regulator output even if other consumer * devices have it enabled. This should be used for situations when device * damage will likely occur if the regulator is not disabled (e.g. over temp). */ int regulator_force_disable(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; int ret; mutex_lock(&rdev->mutex); regulator->uA_load = 0; ret = _regulator_force_disable(regulator->rdev); mutex_unlock(&rdev->mutex); if (rdev->supply) while (rdev->open_count--) regulator_disable(rdev->supply); return ret; } EXPORT_SYMBOL_GPL(regulator_force_disable); static void regulator_disable_work(struct work_struct *work) { struct regulator_dev *rdev = container_of(work, struct regulator_dev, disable_work.work); int count, i, ret; mutex_lock(&rdev->mutex); BUG_ON(!rdev->deferred_disables); count = rdev->deferred_disables; rdev->deferred_disables = 0; for (i = 0; i < count; i++) { ret = _regulator_disable(rdev); if (ret != 0) rdev_err(rdev, "Deferred disable failed: %d\n", ret); } mutex_unlock(&rdev->mutex); if (rdev->supply) { for (i = 0; i < count; i++) { ret = regulator_disable(rdev->supply); if (ret != 0) { rdev_err(rdev, "Supply disable failed: %d\n", ret); } } } } /** * regulator_disable_deferred - disable regulator output with delay * @regulator: regulator source * @ms: miliseconds until the regulator is disabled * * Execute regulator_disable() on the regulator after a delay. This * is intended for use with devices that require some time to quiesce. * * NOTE: this will only disable the regulator output if no other consumer * devices have it enabled, the regulator device supports disabling and * machine constraints permit this operation. */ int regulator_disable_deferred(struct regulator *regulator, int ms) { struct regulator_dev *rdev = regulator->rdev; int ret; if (regulator->always_on) return 0; if (!ms) return regulator_disable(regulator); mutex_lock(&rdev->mutex); rdev->deferred_disables++; mutex_unlock(&rdev->mutex); ret = queue_delayed_work(system_power_efficient_wq, &rdev->disable_work, msecs_to_jiffies(ms)); if (ret < 0) return ret; else return 0; } EXPORT_SYMBOL_GPL(regulator_disable_deferred); static int _regulator_is_enabled(struct regulator_dev *rdev) { /* A GPIO control always takes precedence */ if (rdev->ena_pin) return rdev->ena_gpio_state; /* If we don't know then assume that the regulator is always on */ if (!rdev->desc->ops->is_enabled) return 1; return rdev->desc->ops->is_enabled(rdev); } /** * regulator_is_enabled - is the regulator output enabled * @regulator: regulator source * * Returns positive if the regulator driver backing the source/client * has requested that the device be enabled, zero if it hasn't, else a * negative errno code. * * Note that the device backing this regulator handle can have multiple * users, so it might be enabled even if regulator_enable() was never * called for this particular source. */ int regulator_is_enabled(struct regulator *regulator) { int ret; if (regulator->always_on) return 1; mutex_lock(®ulator->rdev->mutex); ret = _regulator_is_enabled(regulator->rdev); mutex_unlock(®ulator->rdev->mutex); return ret; } EXPORT_SYMBOL_GPL(regulator_is_enabled); /** * regulator_can_change_voltage - check if regulator can change voltage * @regulator: regulator source * * Returns positive if the regulator driver backing the source/client * can change its voltage, false otherwise. Useful for detecting fixed * or dummy regulators and disabling voltage change logic in the client * driver. */ int regulator_can_change_voltage(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; if (rdev->constraints && (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1) return 1; if (rdev->desc->continuous_voltage_range && rdev->constraints->min_uV && rdev->constraints->max_uV && rdev->constraints->min_uV != rdev->constraints->max_uV) return 1; } return 0; } EXPORT_SYMBOL_GPL(regulator_can_change_voltage); /** * regulator_count_voltages - count regulator_list_voltage() selectors * @regulator: regulator source * * Returns number of selectors, or negative errno. Selectors are * numbered starting at zero, and typically correspond to bitfields * in hardware registers. */ int regulator_count_voltages(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; if (rdev->desc->n_voltages) return rdev->desc->n_voltages; if (!rdev->supply) return -EINVAL; return regulator_count_voltages(rdev->supply); } EXPORT_SYMBOL_GPL(regulator_count_voltages); /** * regulator_list_voltage - enumerate supported voltages * @regulator: regulator source * @selector: identify voltage to list * Context: can sleep * * Returns a voltage that can be passed to @regulator_set_voltage(), * zero if this selector code can't be used on this system, or a * negative errno. */ int regulator_list_voltage(struct regulator *regulator, unsigned selector) { struct regulator_dev *rdev = regulator->rdev; const struct regulator_ops *ops = rdev->desc->ops; int ret; if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector) return rdev->desc->fixed_uV; if (ops->list_voltage) { if (selector >= rdev->desc->n_voltages) return -EINVAL; mutex_lock(&rdev->mutex); ret = ops->list_voltage(rdev, selector); mutex_unlock(&rdev->mutex); } else if (rdev->supply) { ret = regulator_list_voltage(rdev->supply, selector); } else { return -EINVAL; } if (ret > 0) { if (ret < rdev->constraints->min_uV) ret = 0; else if (ret > rdev->constraints->max_uV) ret = 0; } return ret; } EXPORT_SYMBOL_GPL(regulator_list_voltage); /** * regulator_get_regmap - get the regulator's register map * @regulator: regulator source * * Returns the register map for the given regulator, or an ERR_PTR value * if the regulator doesn't use regmap. */ struct regmap *regulator_get_regmap(struct regulator *regulator) { struct regmap *map = regulator->rdev->regmap; return map ? map : ERR_PTR(-EOPNOTSUPP); } /** * regulator_get_hardware_vsel_register - get the HW voltage selector register * @regulator: regulator source * @vsel_reg: voltage selector register, output parameter * @vsel_mask: mask for voltage selector bitfield, output parameter * * Returns the hardware register offset and bitmask used for setting the * regulator voltage. This might be useful when configuring voltage-scaling * hardware or firmware that can make I2C requests behind the kernel's back, * for example. * * On success, the output parameters @vsel_reg and @vsel_mask are filled in * and 0 is returned, otherwise a negative errno is returned. */ int regulator_get_hardware_vsel_register(struct regulator *regulator, unsigned *vsel_reg, unsigned *vsel_mask) { struct regulator_dev *rdev = regulator->rdev; const struct regulator_ops *ops = rdev->desc->ops; if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) return -EOPNOTSUPP; *vsel_reg = rdev->desc->vsel_reg; *vsel_mask = rdev->desc->vsel_mask; return 0; } EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register); /** * regulator_list_hardware_vsel - get the HW-specific register value for a selector * @regulator: regulator source * @selector: identify voltage to list * * Converts the selector to a hardware-specific voltage selector that can be * directly written to the regulator registers. The address of the voltage * register can be determined by calling @regulator_get_hardware_vsel_register. * * On error a negative errno is returned. */ int regulator_list_hardware_vsel(struct regulator *regulator, unsigned selector) { struct regulator_dev *rdev = regulator->rdev; const struct regulator_ops *ops = rdev->desc->ops; if (selector >= rdev->desc->n_voltages) return -EINVAL; if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap) return -EOPNOTSUPP; return selector; } EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel); /** * regulator_get_linear_step - return the voltage step size between VSEL values * @regulator: regulator source * * Returns the voltage step size between VSEL values for linear * regulators, or return 0 if the regulator isn't a linear regulator. */ unsigned int regulator_get_linear_step(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; return rdev->desc->uV_step; } EXPORT_SYMBOL_GPL(regulator_get_linear_step); /** * regulator_is_supported_voltage - check if a voltage range can be supported * * @regulator: Regulator to check. * @min_uV: Minimum required voltage in uV. * @max_uV: Maximum required voltage in uV. * * Returns a boolean or a negative error code. */ int regulator_is_supported_voltage(struct regulator *regulator, int min_uV, int max_uV) { struct regulator_dev *rdev = regulator->rdev; int i, voltages, ret; /* If we can't change voltage check the current voltage */ if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) { ret = regulator_get_voltage(regulator); if (ret >= 0) return min_uV <= ret && ret <= max_uV; else return ret; } /* Any voltage within constrains range is fine? */ if (rdev->desc->continuous_voltage_range) return min_uV >= rdev->constraints->min_uV && max_uV <= rdev->constraints->max_uV; ret = regulator_count_voltages(regulator); if (ret < 0) return ret; voltages = ret; for (i = 0; i < voltages; i++) { ret = regulator_list_voltage(regulator, i); if (ret >= min_uV && ret <= max_uV) return 1; } return 0; } EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); static int _regulator_call_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV, unsigned *selector) { struct pre_voltage_change_data data; int ret; data.old_uV = _regulator_get_voltage(rdev); data.min_uV = min_uV; data.max_uV = max_uV; ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, &data); if (ret & NOTIFY_STOP_MASK) return -EINVAL; ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector); if (ret >= 0) return ret; _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, (void *)data.old_uV); return ret; } static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev, int uV, unsigned selector) { struct pre_voltage_change_data data; int ret; data.old_uV = _regulator_get_voltage(rdev); data.min_uV = uV; data.max_uV = uV; ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE, &data); if (ret & NOTIFY_STOP_MASK) return -EINVAL; ret = rdev->desc->ops->set_voltage_sel(rdev, selector); if (ret >= 0) return ret; _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE, (void *)data.old_uV); return ret; } static int _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { int ret; int delay = 0; int best_val = 0; unsigned int selector; int old_selector = -1; trace_regulator_set_voltage(rdev_