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Message-Id: <1249057189-11992-1-git-send-email-quadros.roger@gmail.com>
Date: Fri, 31 Jul 2009 19:19:49 +0300
From: Roger Quadros <quadros.roger@...il.com>
To: broonie@...nsource.wolfsonmicro.com
Cc: philipp.zabel@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH v2] regulator: Add GPIO enable control to fixed voltage regulator driver
From: Roger Quadros <ext-roger.quadros@...ia.com>
Now fixed regulators that have their enable pin connected to a GPIO line
can use the fixed regulator driver. The GPIO number and polarity
information is passed through platform data. GPIO enable control
is acheived using gpiolib.
Signed-off-by: Roger Quadros <ext-roger.quadros@...ia.com>
Reviewed-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Reviewed-by: Philipp Zabel <philipp.zabel@...il.com>
---
drivers/regulator/fixed.c | 66 +++++++++++++++++++++++++++++++++++++-
include/linux/regulator/fixed.h | 17 ++++++++++
2 files changed, 81 insertions(+), 2 deletions(-)
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index cdc674f..bcebb0c 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -20,20 +20,50 @@
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/fixed.h>
+#include <linux/gpio.h>
struct fixed_voltage_data {
struct regulator_desc desc;
struct regulator_dev *dev;
int microvolts;
+ int gpio;
+ int enable_high;
+ int is_enabled;
};
static int fixed_voltage_is_enabled(struct regulator_dev *dev)
{
- return 1;
+ struct fixed_voltage_data *data = rdev_get_drvdata(dev);
+
+ if (data->gpio)
+ return data->is_enabled;
+ else
+ return 1;
}
static int fixed_voltage_enable(struct regulator_dev *dev)
{
+ struct fixed_voltage_data *data = rdev_get_drvdata(dev);
+
+ if (data->gpio) {
+ gpio_set_value(data->gpio,
+ data->enable_high ? 1 : 0);
+ data->is_enabled = 1;
+ }
+
+ return 0;
+}
+
+static int fixed_voltage_disable(struct regulator_dev *dev)
+{
+ struct fixed_voltage_data *data = rdev_get_drvdata(dev);
+
+ if (data->gpio) {
+ gpio_set_value(data->gpio,
+ data->enable_high ? 0 : 1);
+ data->is_enabled = 0;
+ }
+
return 0;
}
@@ -58,6 +88,7 @@ static int fixed_voltage_list_voltage(struct regulator_dev *dev,
static struct regulator_ops fixed_voltage_ops = {
.is_enabled = fixed_voltage_is_enabled,
.enable = fixed_voltage_enable,
+ .disable = fixed_voltage_disable,
.get_voltage = fixed_voltage_get_voltage,
.list_voltage = fixed_voltage_list_voltage,
};
@@ -85,12 +116,37 @@ static int regulator_fixed_voltage_probe(struct platform_device *pdev)
drvdata->desc.n_voltages = 1;
drvdata->microvolts = config->microvolts;
+ if (config->gpio) {
+ drvdata->gpio = config->gpio;
+ drvdata->enable_high = config->enable_high;
+
+ 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
+ * to prevent glitch
+ */
+ ret = gpio_get_value(config->gpio);
+ ret = gpio_direction_output(config->gpio, ret);
+ if (ret) {
+ dev_err(&pdev->dev, "Could not configure "
+ "enable GPIO %d direction: %d\n",
+ config->gpio, ret);
+ goto err_gpio;
+ }
+ } else
+ dev_warn(&pdev->dev, "Not using GPIO 0 for enable control\n");
drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev,
config->init_data, drvdata);
if (IS_ERR(drvdata->dev)) {
ret = PTR_ERR(drvdata->dev);
- goto err_name;
+ goto err_gpio;
}
platform_set_drvdata(pdev, drvdata);
@@ -100,6 +156,9 @@ static int regulator_fixed_voltage_probe(struct platform_device *pdev)
return 0;
+err_gpio:
+ if (config->gpio)
+ gpio_free(config->gpio);
err_name:
kfree(drvdata->desc.name);
err:
@@ -115,6 +174,9 @@ static int regulator_fixed_voltage_remove(struct platform_device *pdev)
kfree(drvdata->desc.name);
kfree(drvdata);
+ if (drvdata->gpio)
+ gpio_free(drvdata->gpio);
+
return 0;
}
diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h
index 91b4da3..b40e06b 100644
--- a/include/linux/regulator/fixed.h
+++ b/include/linux/regulator/fixed.h
@@ -16,9 +16,26 @@
struct regulator_init_data;
+/**
+ * struct fixed_voltage_config - fixed_voltage_config structure
+ * @supply_name: Name of the regulator supply
+ * @microvolts: Output voltage of regulator
+ * @use_gpio_control: Use GPIO enable control
+ * @gpio: GPIO to use for enable control
+ * @enable_high: Polarity of enable GPIO
+ * 1 = Active high, 0 = Active low
+ * @init_data: regulator_init_data
+ *
+ * This structure contains fixed voltage regulator configuration
+ * information that must be passed by platform code to the fixed
+ * voltage regulator driver.
+ */
struct fixed_voltage_config {
const char *supply_name;
int microvolts;
+ int use_gpio_control;
+ int gpio;
+ int enable_high;
struct regulator_init_data *init_data;
};
--
1.6.0.4
--
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