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authorMark Brown <broonie@opensource.wolfsonmicro.com>2012-12-10 12:42:54 +0900
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-12-10 12:42:54 +0900
commit207f30894a8469849d9f5663149d966ff4d411e8 (patch)
treec777ebe2eac0d818cc4c20b39c5e1306dca5f67b /drivers/regulator
parentdb58e0270ce36fbcee22147405e1917ce01880ae (diff)
parentec4f7b88b4a89253ec922d48f77b269ce5cffc2c (diff)
Merge remote-tracking branch 'regulator/topic/gpio' into regulator-next
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/gpio-regulator.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/regulator/gpio-regulator.c b/drivers/regulator/gpio-regulator.c
index 8b5944f2d7d1..8c4e23739494 100644
--- a/drivers/regulator/gpio-regulator.c
+++ b/drivers/regulator/gpio-regulator.c
@@ -28,9 +28,12 @@
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
#include <linux/regulator/gpio-regulator.h>
#include <linux/gpio.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
struct gpio_regulator_data {
struct regulator_desc desc;
@@ -129,6 +132,89 @@ static struct regulator_ops gpio_regulator_voltage_ops = {
.list_voltage = gpio_regulator_list_voltage,
};
+struct gpio_regulator_config *
+of_get_gpio_regulator_config(struct device *dev, struct device_node *np)
+{
+ struct gpio_regulator_config *config;
+ struct property *prop;
+ const char *regtype;
+ int proplen, gpio, i;
+
+ config = devm_kzalloc(dev,
+ sizeof(struct gpio_regulator_config),
+ GFP_KERNEL);
+ if (!config)
+ return ERR_PTR(-ENOMEM);
+
+ config->init_data = of_get_regulator_init_data(dev, np);
+ if (!config->init_data)
+ return ERR_PTR(-EINVAL);
+
+ config->supply_name = config->init_data->constraints.name;
+
+ if (of_property_read_bool(np, "enable-active-high"))
+ config->enable_high = true;
+
+ if (of_property_read_bool(np, "enable-at-boot"))
+ config->enabled_at_boot = true;
+
+ of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
+
+ config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
+
+ /* Fetch GPIOs. */
+ for (i = 0; ; i++)
+ if (of_get_named_gpio(np, "gpios", i) < 0)
+ break;
+ config->nr_gpios = i;
+
+ config->gpios = devm_kzalloc(dev,
+ sizeof(struct gpio) * config->nr_gpios,
+ GFP_KERNEL);
+ if (!config->gpios)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; config->nr_gpios; i++) {
+ gpio = of_get_named_gpio(np, "gpios", i);
+ if (gpio < 0)
+ break;
+ config->gpios[i].gpio = gpio;
+ }
+
+ /* Fetch states. */
+ prop = of_find_property(np, "states", NULL);
+ if (!prop) {
+ dev_err(dev, "No 'states' property found\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ proplen = prop->length / sizeof(int);
+
+ config->states = devm_kzalloc(dev,
+ sizeof(struct gpio_regulator_state)
+ * (proplen / 2),
+ GFP_KERNEL);
+ if (!config->states)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < proplen / 2; i++) {
+ config->states[i].value =
+ be32_to_cpup((int *)prop->value + (i * 2));
+ config->states[i].gpios =
+ be32_to_cpup((int *)prop->value + (i * 2 + 1));
+ }
+ config->nr_states = i;
+
+ of_property_read_string(np, "regulator-type", &regtype);
+
+ if (!strncmp("voltage", regtype, 7))
+ config->type = REGULATOR_VOLTAGE;
+ else if (!strncmp("current", regtype, 7))
+ config->type = REGULATOR_CURRENT;
+
+ return config;
+}
+
static struct regulator_ops gpio_regulator_current_ops = {
.get_current_limit = gpio_regulator_get_value,
.set_current_limit = gpio_regulator_set_current_limit,
@@ -137,10 +223,17 @@ static struct regulator_ops gpio_regulator_current_ops = {
static int __devinit gpio_regulator_probe(struct platform_device *pdev)
{
struct gpio_regulator_config *config = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
struct gpio_regulator_data *drvdata;
struct regulator_config cfg = { };
int ptr, ret, state;
+ if (np) {
+ config = of_get_gpio_regulator_config(&pdev->dev, np);
+ if (IS_ERR(config))
+ return PTR_ERR(config);
+ }
+
drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data),
GFP_KERNEL);
if (drvdata == NULL) {
@@ -215,6 +308,7 @@ static int __devinit gpio_regulator_probe(struct platform_device *pdev)
cfg.dev = &pdev->dev;
cfg.init_data = config->init_data;
cfg.driver_data = drvdata;
+ cfg.of_node = np;
if (config->enable_gpio >= 0)
cfg.ena_gpio = config->enable_gpio;
@@ -270,12 +364,20 @@ static int __devexit gpio_regulator_remove(struct platform_device *pdev)
return 0;
}
+#if defined(CONFIG_OF)
+static const struct of_device_id regulator_gpio_of_match[] __devinitconst = {
+ { .compatible = "regulator-gpio", },
+ {},
+};
+#endif
+
static struct platform_driver gpio_regulator_driver = {
.probe = gpio_regulator_probe,
.remove = __devexit_p(gpio_regulator_remove),
.driver = {
.name = "gpio-regulator",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(regulator_gpio_of_match),
},
};