X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=drivers%2Fregulator%2Fcore.c;h=d8e6a429e8ba046027e9fa8550be6444f47ae971;hb=51acc0bcfc91987ed38195918e0b40ff05197585;hp=d3e38790906ed889de2b78454516ec1410eb6466;hpb=ffdb8f1bfbd9cef1394f5d3c4a774015d4ac0f97;p=~andy%2Flinux diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index d3e38790906..d8e6a429e8b 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -33,6 +34,8 @@ #include "dummy.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, ...) \ @@ -78,11 +81,13 @@ struct regulator { char *supply_name; struct device_attribute dev_attr; struct regulator_dev *rdev; +#ifdef CONFIG_DEBUG_FS + struct dentry *debugfs; +#endif }; static int _regulator_is_enabled(struct regulator_dev *rdev); -static int _regulator_disable(struct regulator_dev *rdev, - struct regulator_dev **supply_rdev_ptr); +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); @@ -90,6 +95,9 @@ static void _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) { @@ -143,8 +151,11 @@ static int regulator_check_voltage(struct regulator_dev *rdev, if (*min_uV < rdev->constraints->min_uV) *min_uV = rdev->constraints->min_uV; - if (*min_uV > *max_uV) + if (*min_uV > *max_uV) { + rdev_err(rdev, "unsupportable voltage range: %d-%duV\n", + *min_uV, *max_uV); return -EINVAL; + } return 0; } @@ -197,8 +208,11 @@ static int regulator_check_current_limit(struct regulator_dev *rdev, if (*min_uA < rdev->constraints->min_uA) *min_uA = rdev->constraints->min_uA; - if (*min_uA > *max_uA) + if (*min_uA > *max_uA) { + rdev_err(rdev, "unsupportable current range: %d-%duA\n", + *min_uA, *max_uA); return -EINVAL; + } return 0; } @@ -213,6 +227,7 @@ static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode) case REGULATOR_MODE_STANDBY: break; default: + rdev_err(rdev, "invalid mode %x specified\n", *mode); return -EINVAL; } @@ -779,7 +794,6 @@ static int machine_constraints_voltage(struct regulator_dev *rdev, if (ret < 0) { rdev_err(rdev, "failed to apply %duV constraint\n", rdev->constraints->min_uV); - rdev->constraints = NULL; return ret; } } @@ -882,7 +896,6 @@ static int set_machine_constraints(struct regulator_dev *rdev, ret = suspend_prepare(rdev, rdev->constraints->initial_state); if (ret < 0) { rdev_err(rdev, "failed to set suspend state\n"); - rdev->constraints = NULL; goto out; } } @@ -909,13 +922,15 @@ static int set_machine_constraints(struct regulator_dev *rdev, ret = ops->enable(rdev); if (ret < 0) { rdev_err(rdev, "failed to enable\n"); - rdev->constraints = NULL; goto out; } } print_constraints(rdev); + return 0; out: + kfree(rdev->constraints); + rdev->constraints = NULL; return ret; } @@ -929,21 +944,20 @@ out: * core if it's child is enabled. */ static int set_supply(struct regulator_dev *rdev, - struct regulator_dev *supply_rdev) + struct regulator_dev *supply_rdev) { int err; - err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj, - "supply"); - if (err) { - rdev_err(rdev, "could not add device link %s err %d\n", - supply_rdev->dev.kobj.name, err); - goto out; + 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; + return err; } - rdev->supply = supply_rdev; - list_add(&rdev->slist, &supply_rdev->supply_list); -out: - return err; + + return 0; } /** @@ -1032,7 +1046,7 @@ static void unset_regulator_supplies(struct regulator_dev *rdev) } } -#define REG_STR_SIZE 32 +#define REG_STR_SIZE 64 static struct regulator *create_regulator(struct regulator_dev *rdev, struct device *dev, @@ -1052,8 +1066,9 @@ static struct regulator *create_regulator(struct regulator_dev *rdev, if (dev) { /* create a 'requested_microamps_name' sysfs entry */ - size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s", - supply_name); + size = scnprintf(buf, REG_STR_SIZE, + "microamps_requested_%s-%s", + dev_name(dev), supply_name); if (size >= REG_STR_SIZE) goto overflow_err; @@ -1088,7 +1103,28 @@ static struct regulator *create_regulator(struct regulator_dev *rdev, dev->kobj.name, err); goto link_name_err; } + } else { + regulator->supply_name = kstrdup(supply_name, GFP_KERNEL); + if (regulator->supply_name == NULL) + goto attr_err; + } + +#ifdef CONFIG_DEBUG_FS + regulator->debugfs = debugfs_create_dir(regulator->supply_name, + rdev->debugfs); + if (IS_ERR_OR_NULL(regulator->debugfs)) { + rdev_warn(rdev, "Failed to create debugfs directory\n"); + regulator->debugfs = NULL; + } 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); } +#endif + mutex_unlock(&rdev->mutex); return regulator; link_name_err: @@ -1267,13 +1303,17 @@ void regulator_put(struct regulator *regulator) mutex_lock(®ulator_list_mutex); rdev = regulator->rdev; +#ifdef CONFIG_DEBUG_FS + debugfs_remove_recursive(regulator->debugfs); +#endif + /* remove any sysfs entries */ if (regulator->dev) { sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name); - kfree(regulator->supply_name); device_remove_file(regulator->dev, ®ulator->dev_attr); kfree(regulator->dev_attr.attr.name); } + kfree(regulator->supply_name); list_del(®ulator->list); kfree(regulator); @@ -1301,19 +1341,6 @@ static int _regulator_enable(struct regulator_dev *rdev) { int ret, delay; - if (rdev->use_count == 0) { - /* do we need to enable the supply regulator first */ - if (rdev->supply) { - mutex_lock(&rdev->supply->mutex); - ret = _regulator_enable(rdev->supply); - mutex_unlock(&rdev->supply->mutex); - if (ret < 0) { - rdev_err(rdev, "failed to enable: %d\n", ret); - return ret; - } - } - } - /* check voltage and requested load before enabling */ if (rdev->constraints && (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) @@ -1388,19 +1415,27 @@ int regulator_enable(struct regulator *regulator) struct regulator_dev *rdev = regulator->rdev; int ret = 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) + regulator_disable(rdev->supply); + return ret; } EXPORT_SYMBOL_GPL(regulator_enable); /* locks held by regulator_disable() */ -static int _regulator_disable(struct regulator_dev *rdev, - struct regulator_dev **supply_rdev_ptr) +static int _regulator_disable(struct regulator_dev *rdev) { int ret = 0; - *supply_rdev_ptr = NULL; if (WARN(rdev->use_count <= 0, "unbalanced disables for %s\n", rdev_get_name(rdev))) @@ -1427,9 +1462,6 @@ static int _regulator_disable(struct regulator_dev *rdev, NULL); } - /* decrease our supplies ref count and disable if required */ - *supply_rdev_ptr = rdev->supply; - rdev->use_count = 0; } else if (rdev->use_count > 1) { @@ -1440,6 +1472,7 @@ static int _regulator_disable(struct regulator_dev *rdev, rdev->use_count--; } + return ret; } @@ -1458,29 +1491,21 @@ static int _regulator_disable(struct regulator_dev *rdev, int regulator_disable(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; - struct regulator_dev *supply_rdev = NULL; int ret = 0; mutex_lock(&rdev->mutex); - ret = _regulator_disable(rdev, &supply_rdev); + ret = _regulator_disable(rdev); mutex_unlock(&rdev->mutex); - /* decrease our supplies ref count and disable if required */ - while (supply_rdev != NULL) { - rdev = supply_rdev; - - mutex_lock(&rdev->mutex); - _regulator_disable(rdev, &supply_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, - struct regulator_dev **supply_rdev_ptr) +static int _regulator_force_disable(struct regulator_dev *rdev) { int ret = 0; @@ -1497,10 +1522,6 @@ static int _regulator_force_disable(struct regulator_dev *rdev, REGULATOR_EVENT_DISABLE, NULL); } - /* decrease our supplies ref count and disable if required */ - *supply_rdev_ptr = rdev->supply; - - rdev->use_count = 0; return ret; } @@ -1516,16 +1537,16 @@ static int _regulator_force_disable(struct regulator_dev *rdev, int regulator_force_disable(struct regulator *regulator) { struct regulator_dev *rdev = regulator->rdev; - struct regulator_dev *supply_rdev = NULL; int ret; mutex_lock(&rdev->mutex); regulator->uA_load = 0; - ret = _regulator_force_disable(rdev, &supply_rdev); + ret = _regulator_force_disable(regulator->rdev); mutex_unlock(&rdev->mutex); - if (supply_rdev) - regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev))); + if (rdev->supply) + while (rdev->open_count--) + regulator_disable(rdev->supply); return ret; } @@ -2136,7 +2157,7 @@ int regulator_set_optimum_mode(struct regulator *regulator, int uA_load) /* get input voltage */ input_uV = 0; if (rdev->supply) - input_uV = _regulator_get_voltage(rdev->supply); + input_uV = regulator_get_voltage(rdev->supply); if (input_uV <= 0) input_uV = rdev->constraints->input_uV; if (input_uV <= 0) { @@ -2206,17 +2227,8 @@ EXPORT_SYMBOL_GPL(regulator_unregister_notifier); static void _notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data) { - struct regulator_dev *_rdev; - /* call rdev chain first */ blocking_notifier_call_chain(&rdev->notifier, event, NULL); - - /* now notify regulator we supply */ - list_for_each_entry(_rdev, &rdev->supply_list, slist) { - mutex_lock(&_rdev->mutex); - _notifier_call_chain(_rdev, event, data); - mutex_unlock(&_rdev->mutex); - } } /** @@ -2264,6 +2276,13 @@ err: } EXPORT_SYMBOL_GPL(regulator_bulk_get); +static void regulator_bulk_enable_async(void *data, async_cookie_t cookie) +{ + struct regulator_bulk_data *bulk = data; + + bulk->ret = regulator_enable(bulk->consumer); +} + /** * regulator_bulk_enable - enable multiple regulator consumers * @@ -2279,21 +2298,33 @@ EXPORT_SYMBOL_GPL(regulator_bulk_get); int regulator_bulk_enable(int num_consumers, struct regulator_bulk_data *consumers) { + LIST_HEAD(async_domain); int i; - int ret; + int ret = 0; + + for (i = 0; i < num_consumers; i++) + async_schedule_domain(regulator_bulk_enable_async, + &consumers[i], &async_domain); + + async_synchronize_full_domain(&async_domain); + /* If any consumer failed we need to unwind any that succeeded */ for (i = 0; i < num_consumers; i++) { - ret = regulator_enable(consumers[i].consumer); - if (ret != 0) + if (consumers[i].ret != 0) { + ret = consumers[i].ret; goto err; + } } return 0; err: - pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret); - for (--i; i >= 0; --i) - regulator_disable(consumers[i].consumer); + for (i = 0; i < num_consumers; i++) + if (consumers[i].ret == 0) + regulator_disable(consumers[i].consumer); + else + pr_err("Failed to enable %s: %d\n", + consumers[i].supply, consumers[i].ret); return ret; } @@ -2589,9 +2620,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc, rdev->owner = regulator_desc->owner; rdev->desc = regulator_desc; INIT_LIST_HEAD(&rdev->consumer_list); - INIT_LIST_HEAD(&rdev->supply_list); INIT_LIST_HEAD(&rdev->list); - INIT_LIST_HEAD(&rdev->slist); BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier); /* preform any regulator specific init */ @@ -2672,6 +2701,7 @@ unset_supplies: unset_regulator_supplies(rdev); scrub: + kfree(rdev->constraints); device_unregister(&rdev->dev); /* device core frees rdev */ rdev = ERR_PTR(ret); @@ -2703,7 +2733,7 @@ void regulator_unregister(struct regulator_dev *rdev) unset_regulator_supplies(rdev); list_del(&rdev->list); if (rdev->supply) - sysfs_remove_link(&rdev->dev.kobj, "supply"); + regulator_put(rdev->supply); device_unregister(&rdev->dev); kfree(rdev->constraints); mutex_unlock(®ulator_list_mutex);