diff options
Diffstat (limited to 'drivers/regulator/fixed.c')
| -rw-r--r-- | drivers/regulator/fixed.c | 69 |
1 files changed, 36 insertions, 33 deletions
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c index 40f38030b39..f09fe7b20e8 100644 --- a/drivers/regulator/fixed.c +++ b/drivers/regulator/fixed.c @@ -25,7 +25,6 @@ #include <linux/regulator/driver.h> #include <linux/regulator/fixed.h> #include <linux/gpio.h> -#include <linux/delay.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/of_gpio.h> @@ -91,6 +90,9 @@ of_get_fixed_voltage_config(struct device *dev) if (of_find_property(np, "enable-active-high", NULL)) config->enable_high = true; + if (of_find_property(np, "gpio-open-drain", NULL)) + config->gpio_is_open_drain = true; + return config; } @@ -105,10 +107,8 @@ static int fixed_voltage_enable(struct regulator_dev *dev) { struct fixed_voltage_data *data = rdev_get_drvdata(dev); - if (gpio_is_valid(data->gpio)) { - gpio_set_value_cansleep(data->gpio, data->enable_high); - data->is_enabled = true; - } + gpio_set_value_cansleep(data->gpio, data->enable_high); + data->is_enabled = true; return 0; } @@ -117,10 +117,8 @@ static int fixed_voltage_disable(struct regulator_dev *dev) { struct fixed_voltage_data *data = rdev_get_drvdata(dev); - if (gpio_is_valid(data->gpio)) { - gpio_set_value_cansleep(data->gpio, !data->enable_high); - data->is_enabled = false; - } + gpio_set_value_cansleep(data->gpio, !data->enable_high); + data->is_enabled = false; return 0; } @@ -153,7 +151,7 @@ static int fixed_voltage_list_voltage(struct regulator_dev *dev, return data->microvolts; } -static struct regulator_ops fixed_voltage_ops = { +static struct regulator_ops fixed_voltage_gpio_ops = { .is_enabled = fixed_voltage_is_enabled, .enable = fixed_voltage_enable, .disable = fixed_voltage_disable, @@ -162,10 +160,16 @@ static struct regulator_ops fixed_voltage_ops = { .list_voltage = fixed_voltage_list_voltage, }; +static struct regulator_ops fixed_voltage_ops = { + .get_voltage = fixed_voltage_get_voltage, + .list_voltage = fixed_voltage_list_voltage, +}; + static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) { struct fixed_voltage_config *config; struct fixed_voltage_data *drvdata; + struct regulator_config cfg = { }; int ret; if (pdev->dev.of_node) @@ -176,7 +180,8 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) if (!config) return -ENOMEM; - drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL); + drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), + GFP_KERNEL); if (drvdata == NULL) { dev_err(&pdev->dev, "Failed to allocate device data\n"); ret = -ENOMEM; @@ -191,7 +196,6 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) } drvdata->desc.type = REGULATOR_VOLTAGE; drvdata->desc.owner = THIS_MODULE; - drvdata->desc.ops = &fixed_voltage_ops; if (config->microvolts) drvdata->desc.n_voltages = 1; @@ -201,6 +205,7 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) drvdata->startup_delay = config->startup_delay; if (gpio_is_valid(config->gpio)) { + int gpio_flag; drvdata->enable_high = config->enable_high; /* FIXME: Remove below print warning @@ -218,39 +223,39 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) dev_warn(&pdev->dev, "using GPIO 0 for regulator enable control\n"); - ret = gpio_request(config->gpio, config->supply_name); - if (ret) { - dev_err(&pdev->dev, - "Could not obtain regulator enable GPIO %d: %d\n", - config->gpio, ret); - goto err_name; - } - - /* set output direction without changing state + /* + * set output direction without changing state * to prevent glitch */ drvdata->is_enabled = config->enabled_at_boot; ret = drvdata->is_enabled ? config->enable_high : !config->enable_high; + gpio_flag = ret ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; + + if (config->gpio_is_open_drain) + gpio_flag |= GPIOF_OPEN_DRAIN; - ret = gpio_direction_output(config->gpio, ret); + ret = gpio_request_one(config->gpio, gpio_flag, + config->supply_name); if (ret) { dev_err(&pdev->dev, - "Could not configure regulator enable GPIO %d direction: %d\n", + "Could not obtain regulator enable GPIO %d: %d\n", config->gpio, ret); - goto err_gpio; + goto err_name; } + drvdata->desc.ops = &fixed_voltage_gpio_ops; + } else { - /* Regulator without GPIO control is considered - * always enabled - */ - drvdata->is_enabled = true; + drvdata->desc.ops = &fixed_voltage_ops; } - drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev, - config->init_data, drvdata, - pdev->dev.of_node); + cfg.dev = &pdev->dev; + cfg.init_data = config->init_data; + cfg.driver_data = drvdata; + cfg.of_node = pdev->dev.of_node; + + drvdata->dev = regulator_register(&drvdata->desc, &cfg); if (IS_ERR(drvdata->dev)) { ret = PTR_ERR(drvdata->dev); dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); @@ -270,7 +275,6 @@ err_gpio: err_name: kfree(drvdata->desc.name); err: - kfree(drvdata); return ret; } @@ -282,7 +286,6 @@ static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev) if (gpio_is_valid(drvdata->gpio)) gpio_free(drvdata->gpio); kfree(drvdata->desc.name); - kfree(drvdata); return 0; } |