diff options
Diffstat (limited to 'drivers/regulator/core.c')
| -rw-r--r-- | drivers/regulator/core.c | 178 |
1 files changed, 144 insertions, 34 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 938398f3e869..ca86f39a0fdc 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -25,6 +25,8 @@ #include <linux/mutex.h> #include <linux/suspend.h> #include <linux/delay.h> +#include <linux/of.h> +#include <linux/regulator/of_regulator.h> #include <linux/regulator/consumer.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> @@ -132,6 +134,33 @@ static struct regulator *get_device_regulator(struct device *dev) return NULL; } +/** + * 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. + * retruns 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_warn(dev, "%s property in node %s references invalid phandle", + prop_name, dev->of_node->full_name); + return NULL; + } + return regnode; +} + /* Platform voltage constraint check */ static int regulator_check_voltage(struct regulator_dev *rdev, int *min_uV, int *max_uV) @@ -883,8 +912,12 @@ static int set_machine_constraints(struct regulator_dev *rdev, int ret = 0; struct regulator_ops *ops = rdev->desc->ops; - rdev->constraints = kmemdup(constraints, sizeof(*constraints), - GFP_KERNEL); + if (constraints) + rdev->constraints = kmemdup(constraints, sizeof(*constraints), + GFP_KERNEL); + else + rdev->constraints = kzalloc(sizeof(*constraints), + GFP_KERNEL); if (!rdev->constraints) return -ENOMEM; @@ -893,7 +926,7 @@ static int set_machine_constraints(struct regulator_dev *rdev, goto out; /* do we need to setup our suspend state */ - if (constraints->initial_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"); @@ -901,7 +934,7 @@ static int set_machine_constraints(struct regulator_dev *rdev, } } - if (constraints->initial_mode) { + if (rdev->constraints->initial_mode) { if (!ops->set_mode) { rdev_err(rdev, "no set_mode operation\n"); ret = -EINVAL; @@ -952,9 +985,8 @@ static int set_supply(struct regulator_dev *rdev, rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); - if (IS_ERR(rdev->supply)) { - err = PTR_ERR(rdev->supply); - rdev->supply = NULL; + if (rdev->supply == NULL) { + err = -ENOMEM; return err; } @@ -1148,6 +1180,30 @@ static int _regulator_get_enable_time(struct regulator_dev *rdev) return rdev->desc->ops->enable_time(rdev); } +static struct regulator_dev *regulator_dev_lookup(struct device *dev, + const char *supply) +{ + struct regulator_dev *r; + struct device_node *node; + + /* 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; + } + + /* if not found, try doing it non-dt way */ + list_for_each_entry(r, ®ulator_list, list) + if (strcmp(rdev_get_name(r), supply) == 0) + return r; + + return NULL; +} + /* Internal regulator request function */ static struct regulator *_regulator_get(struct device *dev, const char *id, int exclusive) @@ -1168,6 +1224,10 @@ static struct regulator *_regulator_get(struct device *dev, const char *id, mutex_lock(®ulator_list_mutex); + rdev = regulator_dev_lookup(dev, id); + if (rdev) + goto found; + list_for_each_entry(map, ®ulator_map_list, list) { /* If the mapping has a device set up it must match */ if (map->dev_name && @@ -1221,6 +1281,7 @@ found: if (regulator == NULL) { regulator = ERR_PTR(-ENOMEM); module_put(rdev->owner); + goto out; } rdev->open_count++; @@ -1726,6 +1787,7 @@ int regulator_is_supported_voltage(struct regulator *regulator, return 0; } +EXPORT_SYMBOL_GPL(regulator_is_supported_voltage); static int _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) @@ -2429,6 +2491,43 @@ err: EXPORT_SYMBOL_GPL(regulator_bulk_disable); /** + * regulator_bulk_force_disable - force disable multiple regulator consumers + * + * @num_consumers: Number of consumers + * @consumers: Consumer data; clients are stored here. + * @return 0 on success, an errno on failure + * + * This convenience API allows consumers to forcibly disable multiple regulator + * clients in a single API call. + * NOTE: This should be used for situations when device damage will + * likely occur if the regulators are not disabled (e.g. over temp). + * Although regulator_force_disable function call for some consumers can + * return error numbers, the function is called for all consumers. + */ +int regulator_bulk_force_disable(int num_consumers, + struct regulator_bulk_data *consumers) +{ + int i; + int ret; + + for (i = 0; i < num_consumers; i++) + consumers[i].ret = + regulator_force_disable(consumers[i].consumer); + + for (i = 0; i < num_consumers; i++) { + if (consumers[i].ret != 0) { + ret = consumers[i].ret; + goto out; + } + } + + return 0; +out: + return ret; +} +EXPORT_SYMBOL_GPL(regulator_bulk_force_disable); + +/** * regulator_bulk_free - free multiple regulator consumers * * @num_consumers: Number of consumers @@ -2503,7 +2602,8 @@ static int add_regulator_attributes(struct regulator_dev *rdev) int status = 0; /* some attributes need specific methods to be displayed */ - if (ops->get_voltage || ops->get_voltage_sel) { + if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || + (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { status = device_create_file(dev, &dev_attr_microvolts); if (status < 0) return status; @@ -2637,11 +2737,13 @@ static void rdev_init_debugfs(struct regulator_dev *rdev) */ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, struct device *dev, const struct regulator_init_data *init_data, - void *driver_data) + void *driver_data, struct device_node *of_node) { + const struct regulation_constraints *constraints = NULL; static atomic_t regulator_no = ATOMIC_INIT(0); struct regulator_dev *rdev; int ret, i; + const char *supply = NULL; if (regulator_desc == NULL) return ERR_PTR(-EINVAL); @@ -2653,9 +2755,6 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, regulator_desc->type != REGULATOR_CURRENT) return ERR_PTR(-EINVAL); - if (!init_data) - return ERR_PTR(-EINVAL); - /* Only one of each should be implemented */ WARN_ON(regulator_desc->ops->get_voltage && regulator_desc->ops->get_voltage_sel); @@ -2688,7 +2787,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work); /* preform any regulator specific init */ - if (init_data->regulator_init) { + if (init_data && init_data->regulator_init) { ret = init_data->regulator_init(rdev->reg_data); if (ret < 0) goto clean; @@ -2696,6 +2795,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, /* register with sysfs */ rdev->dev.class = ®ulator_class; + rdev->dev.of_node = of_node; rdev->dev.parent = dev; dev_set_name(&rdev->dev, "regulator.%d", atomic_inc_return(®ulator_no) - 1); @@ -2708,7 +2808,10 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, dev_set_drvdata(&rdev->dev, rdev); /* set regulator constraints */ - ret = set_machine_constraints(rdev, &init_data->constraints); + if (init_data) + constraints = &init_data->constraints; + + ret = set_machine_constraints(rdev, constraints); if (ret < 0) goto scrub; @@ -2717,21 +2820,18 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, if (ret < 0) goto scrub; - if (init_data->supply_regulator) { + if (init_data && init_data->supply_regulator) + supply = init_data->supply_regulator; + else if (regulator_desc->supply_name) + supply = regulator_desc->supply_name; + + if (supply) { struct regulator_dev *r; - int found = 0; - list_for_each_entry(r, ®ulator_list, list) { - if (strcmp(rdev_get_name(r), - init_data->supply_regulator) == 0) { - found = 1; - break; - } - } + r = regulator_dev_lookup(dev, supply); - if (!found) { - dev_err(dev, "Failed to find supply %s\n", - init_data->supply_regulator); + if (!r) { + dev_err(dev, "Failed to find supply %s\n", supply); ret = -ENODEV; goto scrub; } @@ -2739,18 +2839,28 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, ret = set_supply(rdev, r); if (ret < 0) goto scrub; + + /* Enable supply if rail is enabled */ + if (rdev->desc->ops->is_enabled && + rdev->desc->ops->is_enabled(rdev)) { + ret = regulator_enable(rdev->supply); + if (ret < 0) + goto scrub; + } } /* add consumers devices */ - for (i = 0; i < init_data->num_consumer_supplies; i++) { - ret = set_consumer_device_supply(rdev, - init_data->consumer_supplies[i].dev, - init_data->consumer_supplies[i].dev_name, - init_data->consumer_supplies[i].supply); - if (ret < 0) { - dev_err(dev, "Failed to set supply %s\n", + if (init_data) { + for (i = 0; i < init_data->num_consumer_supplies; i++) { + ret = set_consumer_device_supply(rdev, + init_data->consumer_supplies[i].dev, + init_data->consumer_supplies[i].dev_name, init_data->consumer_supplies[i].supply); - goto unset_supplies; + if (ret < 0) { + dev_err(dev, "Failed to set supply %s\n", + init_data->consumer_supplies[i].supply); + goto unset_supplies; + } } } |