diff options
Diffstat (limited to 'drivers/regulator/core.c')
-rw-r--r-- | drivers/regulator/core.c | 157 |
1 files changed, 117 insertions, 40 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index bca9167d8c43..ec8184d53f13 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -783,8 +783,6 @@ static int suspend_set_state(struct regulator_dev *rdev, /* locks held by caller */ static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state) { - lockdep_assert_held_once(&rdev->mutex); - if (!rdev->constraints) return -EINVAL; @@ -1145,17 +1143,6 @@ static int set_machine_constraints(struct regulator_dev *rdev, } } - if (rdev->constraints->active_discharge && ops->set_active_discharge) { - bool ad_state = (rdev->constraints->active_discharge == - REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; - - ret = ops->set_active_discharge(rdev, ad_state); - if (ret < 0) { - rdev_err(rdev, "failed to set active discharge\n"); - return ret; - } - } - print_constraints(rdev); return 0; } @@ -1267,6 +1254,55 @@ static void unset_regulator_supplies(struct regulator_dev *rdev) } } +#ifdef CONFIG_DEBUG_FS +static ssize_t constraint_flags_read_file(struct file *file, + char __user *user_buf, + size_t count, loff_t *ppos) +{ + const struct regulator *regulator = file->private_data; + const struct regulation_constraints *c = regulator->rdev->constraints; + char *buf; + ssize_t ret; + + if (!c) + return 0; + + buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = snprintf(buf, PAGE_SIZE, + "always_on: %u\n" + "boot_on: %u\n" + "apply_uV: %u\n" + "ramp_disable: %u\n" + "soft_start: %u\n" + "pull_down: %u\n" + "over_current_protection: %u\n", + c->always_on, + c->boot_on, + c->apply_uV, + c->ramp_disable, + c->soft_start, + c->pull_down, + c->over_current_protection); + + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + kfree(buf); + + return ret; +} + +#endif + +static const struct file_operations constraint_flags_fops = { +#ifdef CONFIG_DEBUG_FS + .open = simple_open, + .read = constraint_flags_read_file, + .llseek = default_llseek, +#endif +}; + #define REG_STR_SIZE 64 static struct regulator *create_regulator(struct regulator_dev *rdev, @@ -1322,6 +1358,9 @@ static struct regulator *create_regulator(struct regulator_dev *rdev, ®ulator->min_uV); debugfs_create_u32("max_uV", 0444, regulator->debugfs, ®ulator->max_uV); + debugfs_create_file("constraint_flags", 0444, + regulator->debugfs, regulator, + &constraint_flags_fops); } /* @@ -1527,10 +1566,11 @@ static int regulator_resolve_supply(struct regulator_dev *rdev) } /* Cascade always-on state to supply */ - if (_regulator_is_enabled(rdev) && rdev->supply) { + if (_regulator_is_enabled(rdev)) { ret = regulator_enable(rdev->supply); if (ret < 0) { _regulator_put(rdev->supply); + rdev->supply = NULL; return ret; } } @@ -3100,6 +3140,23 @@ EXPORT_SYMBOL_GPL(regulator_sync_voltage); static int _regulator_get_voltage(struct regulator_dev *rdev) { int sel, ret; + bool bypassed; + + if (rdev->desc->ops->get_bypass) { + ret = rdev->desc->ops->get_bypass(rdev, &bypassed); + if (ret < 0) + return ret; + if (bypassed) { + /* if bypassed the regulator must have a supply */ + if (!rdev->supply) { + rdev_err(rdev, + "bypassed regulator has no supply!\n"); + return -EPROBE_DEFER; + } + + return _regulator_get_voltage(rdev->supply->rdev); + } + } if (rdev->desc->ops->get_voltage_sel) { sel = rdev->desc->ops->get_voltage_sel(rdev); @@ -3830,6 +3887,16 @@ static void rdev_init_debugfs(struct regulator_dev *rdev) &rdev->bypass_count); } +static int regulator_register_resolve_supply(struct device *dev, void *data) +{ + struct regulator_dev *rdev = dev_to_rdev(dev); + + if (regulator_resolve_supply(rdev)) + rdev_dbg(rdev, "unable to resolve supply\n"); + + return 0; +} + /** * regulator_register - register regulator * @regulator_desc: regulator to register @@ -3901,8 +3968,6 @@ regulator_register(const struct regulator_desc *regulator_desc, rdev->dev.of_node = of_node_get(config->of_node); } - mutex_lock(®ulator_list_mutex); - mutex_init(&rdev->mutex); rdev->reg_data = config->driver_data; rdev->owner = regulator_desc->owner; @@ -3927,7 +3992,9 @@ regulator_register(const struct regulator_desc *regulator_desc, if ((config->ena_gpio || config->ena_gpio_initialized) && gpio_is_valid(config->ena_gpio)) { + mutex_lock(®ulator_list_mutex); ret = regulator_ena_gpio_request(rdev, config); + mutex_unlock(®ulator_list_mutex); if (ret != 0) { rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", config->ena_gpio, ret); @@ -3940,63 +4007,73 @@ regulator_register(const struct regulator_desc *regulator_desc, rdev->dev.parent = dev; dev_set_name(&rdev->dev, "regulator.%lu", (unsigned long) atomic_inc_return(®ulator_no)); - ret = device_register(&rdev->dev); - if (ret != 0) { - put_device(&rdev->dev); - goto wash; - } - - dev_set_drvdata(&rdev->dev, rdev); /* set regulator constraints */ if (init_data) constraints = &init_data->constraints; - ret = set_machine_constraints(rdev, constraints); - if (ret < 0) - goto scrub; - if (init_data && init_data->supply_regulator) rdev->supply_name = init_data->supply_regulator; else if (regulator_desc->supply_name) rdev->supply_name = regulator_desc->supply_name; + /* + * Attempt to resolve the regulator supply, if specified, + * but don't return an error if we fail because we will try + * to resolve it again later as more regulators are added. + */ + if (regulator_resolve_supply(rdev)) + rdev_dbg(rdev, "unable to resolve supply\n"); + + ret = set_machine_constraints(rdev, constraints); + if (ret < 0) + goto wash; + /* add consumers devices */ if (init_data) { + mutex_lock(®ulator_list_mutex); for (i = 0; i < init_data->num_consumer_supplies; i++) { ret = set_consumer_device_supply(rdev, init_data->consumer_supplies[i].dev_name, init_data->consumer_supplies[i].supply); if (ret < 0) { + mutex_unlock(®ulator_list_mutex); dev_err(dev, "Failed to set supply %s\n", init_data->consumer_supplies[i].supply); goto unset_supplies; } } + mutex_unlock(®ulator_list_mutex); + } + + ret = device_register(&rdev->dev); + if (ret != 0) { + put_device(&rdev->dev); + goto unset_supplies; } + dev_set_drvdata(&rdev->dev, rdev); rdev_init_debugfs(rdev); -out: - mutex_unlock(®ulator_list_mutex); + + /* try to resolve regulators supply since a new one was registered */ + class_for_each_device(®ulator_class, NULL, NULL, + regulator_register_resolve_supply); kfree(config); return rdev; unset_supplies: + mutex_lock(®ulator_list_mutex); unset_regulator_supplies(rdev); - -scrub: - regulator_ena_gpio_free(rdev); - device_unregister(&rdev->dev); - /* device core frees rdev */ - rdev = ERR_PTR(ret); - goto out; - + mutex_unlock(®ulator_list_mutex); wash: + kfree(rdev->constraints); + mutex_lock(®ulator_list_mutex); regulator_ena_gpio_free(rdev); + mutex_unlock(®ulator_list_mutex); clean: kfree(rdev); - rdev = ERR_PTR(ret); - goto out; + kfree(config); + return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(regulator_register); @@ -4022,8 +4099,8 @@ void regulator_unregister(struct regulator_dev *rdev) WARN_ON(rdev->open_count); unset_regulator_supplies(rdev); list_del(&rdev->list); - mutex_unlock(®ulator_list_mutex); regulator_ena_gpio_free(rdev); + mutex_unlock(®ulator_list_mutex); device_unregister(&rdev->dev); } EXPORT_SYMBOL_GPL(regulator_unregister); |