diff options
Diffstat (limited to 'drivers/regulator/core.c')
-rw-r--r-- | drivers/regulator/core.c | 220 |
1 files changed, 194 insertions, 26 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index e3661c20cf38..6e5017841582 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -51,6 +51,7 @@ 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 bool has_full_constraints; static bool board_wants_dummy_regulator; @@ -69,6 +70,19 @@ struct regulator_map { }; /* + * struct regulator_enable_gpio + * + * Management for shared enable GPIO pin + */ +struct regulator_enable_gpio { + struct list_head list; + int gpio; + 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 * * One for each consumer device. @@ -116,7 +130,7 @@ static const char *rdev_get_name(struct regulator_dev *rdev) * @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 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) @@ -1229,7 +1243,7 @@ static struct regulator *_regulator_get(struct device *dev, const char *id, struct regulator_dev *rdev; struct regulator *regulator = ERR_PTR(-EPROBE_DEFER); const char *devname = NULL; - int ret; + int ret = 0; if (id == NULL) { pr_err("get() with no identifier\n"); @@ -1245,6 +1259,15 @@ static struct regulator *_regulator_get(struct device *dev, const char *id, if (rdev) goto found; + /* + * If we have return value from dev_lookup fail, we do not expect to + * succeed, so, quit with appropriate error value + */ + if (ret) { + regulator = ERR_PTR(ret); + goto out; + } + if (board_wants_dummy_regulator) { rdev = dummy_regulator_rdev; goto found; @@ -1456,6 +1479,101 @@ void devm_regulator_put(struct regulator *regulator) } EXPORT_SYMBOL_GPL(devm_regulator_put); +/* 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; + int ret; + + list_for_each_entry(pin, ®ulator_ena_gpio_list, list) { + if (pin->gpio == config->ena_gpio) { + 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->gpio = config->ena_gpio; + 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->gpio == rdev->ena_pin->gpio) { + if (pin->request_count <= 1) { + pin->request_count = 0; + gpio_free(pin->gpio); + list_del(&pin->list); + kfree(pin); + } else { + pin->request_count--; + } + } + } +} + +/** + * Balance enable_count of each GPIO and actual GPIO pin control. + * 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) + gpio_set_value_cansleep(pin->gpio, + !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) { + gpio_set_value_cansleep(pin->gpio, + pin->ena_gpio_invert); + pin->enable_count = 0; + } + } + + return 0; +} + static int _regulator_do_enable(struct regulator_dev *rdev) { int ret, delay; @@ -1471,9 +1589,10 @@ static int _regulator_do_enable(struct regulator_dev *rdev) trace_regulator_enable(rdev_get_name(rdev)); - if (rdev->ena_gpio) { - gpio_set_value_cansleep(rdev->ena_gpio, - !rdev->ena_gpio_invert); + 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); @@ -1575,9 +1694,10 @@ static int _regulator_do_disable(struct regulator_dev *rdev) trace_regulator_disable(rdev_get_name(rdev)); - if (rdev->ena_gpio) { - gpio_set_value_cansleep(rdev->ena_gpio, - rdev->ena_gpio_invert); + 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) { @@ -1794,7 +1914,10 @@ int regulator_is_enabled_regmap(struct regulator_dev *rdev) if (ret != 0) return ret; - return (val & rdev->desc->enable_mask) != 0; + if (rdev->desc->enable_is_inverted) + return (val & rdev->desc->enable_mask) == 0; + else + return (val & rdev->desc->enable_mask) != 0; } EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); @@ -1809,9 +1932,15 @@ EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap); */ int regulator_enable_regmap(struct regulator_dev *rdev) { + unsigned int val; + + if (rdev->desc->enable_is_inverted) + val = 0; + else + val = rdev->desc->enable_mask; + return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, - rdev->desc->enable_mask, - rdev->desc->enable_mask); + rdev->desc->enable_mask, val); } EXPORT_SYMBOL_GPL(regulator_enable_regmap); @@ -1826,15 +1955,22 @@ EXPORT_SYMBOL_GPL(regulator_enable_regmap); */ int regulator_disable_regmap(struct regulator_dev *rdev) { + unsigned int val; + + if (rdev->desc->enable_is_inverted) + val = rdev->desc->enable_mask; + else + val = 0; + return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg, - rdev->desc->enable_mask, 0); + rdev->desc->enable_mask, val); } EXPORT_SYMBOL_GPL(regulator_disable_regmap); static int _regulator_is_enabled(struct regulator_dev *rdev) { /* A GPIO control always takes precedence */ - if (rdev->ena_gpio) + if (rdev->ena_pin) return rdev->ena_gpio_state; /* If we don't know then assume that the regulator is always on */ @@ -2138,6 +2274,37 @@ int regulator_map_voltage_iterate(struct regulator_dev *rdev, EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); /** + * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list + * + * @rdev: Regulator to operate on + * @min_uV: Lower bound for voltage + * @max_uV: Upper bound for voltage + * + * Drivers that have ascendant voltage list can use this as their + * map_voltage() operation. + */ +int regulator_map_voltage_ascend(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + int i, ret; + + for (i = 0; i < rdev->desc->n_voltages; i++) { + ret = rdev->desc->ops->list_voltage(rdev, i); + if (ret < 0) + continue; + + if (ret > max_uV) + break; + + if (ret >= min_uV && ret <= max_uV) + return i; + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend); + +/** * regulator_map_voltage_linear - map_voltage() for simple linear mappings * * @rdev: Regulator to operate on @@ -3237,7 +3404,7 @@ static int add_regulator_attributes(struct regulator_dev *rdev) if (status < 0) return status; } - if (rdev->ena_gpio || ops->is_enabled) { + if (rdev->ena_pin || ops->is_enabled) { status = device_create_file(dev, &dev_attr_state); if (status < 0) return status; @@ -3439,22 +3606,17 @@ regulator_register(const struct regulator_desc *regulator_desc, dev_set_drvdata(&rdev->dev, rdev); if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) { - ret = gpio_request_one(config->ena_gpio, - GPIOF_DIR_OUT | config->ena_gpio_flags, - rdev_get_name(rdev)); + ret = regulator_ena_gpio_request(rdev, config); if (ret != 0) { rdev_err(rdev, "Failed to request enable GPIO%d: %d\n", config->ena_gpio, ret); goto wash; } - rdev->ena_gpio = config->ena_gpio; - rdev->ena_gpio_invert = config->ena_gpio_invert; - if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH) rdev->ena_gpio_state = 1; - if (rdev->ena_gpio_invert) + if (config->ena_gpio_invert) rdev->ena_gpio_state = !rdev->ena_gpio_state; } @@ -3481,7 +3643,14 @@ regulator_register(const struct regulator_desc *regulator_desc, r = regulator_dev_lookup(dev, supply, &ret); - if (!r) { + if (ret == -ENODEV) { + /* + * No supply was specified for this regulator and + * there will never be one. + */ + ret = 0; + goto add_dev; + } else if (!r) { dev_err(dev, "Failed to find supply %s\n", supply); ret = -EPROBE_DEFER; goto scrub; @@ -3499,6 +3668,7 @@ regulator_register(const struct regulator_desc *regulator_desc, } } +add_dev: /* add consumers devices */ if (init_data) { for (i = 0; i < init_data->num_consumer_supplies; i++) { @@ -3526,8 +3696,7 @@ unset_supplies: scrub: if (rdev->supply) _regulator_put(rdev->supply); - if (rdev->ena_gpio) - gpio_free(rdev->ena_gpio); + regulator_ena_gpio_free(rdev); kfree(rdev->constraints); wash: device_unregister(&rdev->dev); @@ -3562,8 +3731,7 @@ void regulator_unregister(struct regulator_dev *rdev) unset_regulator_supplies(rdev); list_del(&rdev->list); kfree(rdev->constraints); - if (rdev->ena_gpio) - gpio_free(rdev->ena_gpio); + regulator_ena_gpio_free(rdev); device_unregister(&rdev->dev); mutex_unlock(®ulator_list_mutex); } |