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Subject[PATCH 10/13] extcon: extcon-gpio: add devicetree support
Date
This patch modifies extcon-gpio driver to use initialization data from
devicetree if platform data is not available. It allows to set controller
and cable names, and another parameters from devicetree bindings.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
---
drivers/extcon/extcon-gpio.c | 63 ++++++++++++++++++++++++++++++------
include/linux/extcon/extcon-gpio.h | 2 +-
2 files changed, 55 insertions(+), 10 deletions(-)

diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
index fc90b7a..2a3cfd7 100644
--- a/drivers/extcon/extcon-gpio.c
+++ b/drivers/extcon/extcon-gpio.c
@@ -28,6 +28,8 @@
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/extcon.h>
#include <linux/extcon/extcon-gpio.h>

@@ -53,7 +55,7 @@ static void gpio_extcon_work(struct work_struct *work)
state = gpio_get_value(data->gpio);
if (data->gpio_active_low)
state = !state;
- extcon_set_state(&data->edev, state);
+ extcon_set_cable_state_(&data->edev, 0, state);
}

static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
@@ -70,7 +72,7 @@ static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf)
struct gpio_extcon_data *extcon_data =
container_of(edev, struct gpio_extcon_data, edev);
const char *state;
- if (extcon_get_state(edev))
+ if (extcon_get_cable_state_(edev, 0))
state = extcon_data->state_on;
else
state = extcon_data->state_off;
@@ -80,17 +82,50 @@ static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf)
return -EINVAL;
}

+static struct gpio_extcon_platform_data *get_pdata_from_dt(struct device *dev)
+{
+ int ret;
+ struct gpio_extcon_platform_data *pdata =
+ devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+
+ ret = of_property_read_string_index(dev->of_node,
+ "gpio-controller-name", 0, &pdata->name);
+ if (ret)
+ return NULL;
+
+ ret = of_property_read_string_index(dev->of_node,
+ "gpio-cable-name", 0, &pdata->cable_name);
+ if (ret)
+ return NULL;
+
+ ret = of_property_read_u32_array(dev->of_node,
+ "gpio-debounce", &pdata->debounce, 0);
+ if (ret)
+ pdata->debounce = 0;
+
+ pdata->gpio = of_get_gpio(dev->of_node, 0);
+ if (pdata->gpio < 0)
+ return NULL;
+
+ pdata->gpio_active_low = of_property_read_bool(dev->of_node,
+ "gpio-active-low");
+
+ pdata->check_on_resume = of_property_read_bool(dev->of_node,
+ "check-on-resume");
+ return pdata;
+}
+
static int gpio_extcon_probe(struct platform_device *pdev)
{
struct gpio_extcon_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct gpio_extcon_data *extcon_data;
+ const char *gpio_extcon_cable[2];
int ret;

- if (!pdata)
- return -EBUSY;
- if (!pdata->irq_flags) {
- dev_err(&pdev->dev, "IRQ flag is not specified.\n");
- return -EINVAL;
+ if (!pdata) {
+ pdata = get_pdata_from_dt(&pdev->dev);
+ if (!pdata)
+ return -EINVAL;
}

extcon_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_extcon_data),
@@ -98,10 +133,14 @@ static int gpio_extcon_probe(struct platform_device *pdev)
if (!extcon_data)
return -ENOMEM;

+ gpio_extcon_cable[0] = pdata->cable_name;
+ gpio_extcon_cable[1] = NULL;
+
extcon_data->edev.name = pdata->name;
extcon_data->edev.dev.parent = &pdev->dev;
extcon_data->edev.node = pdev->dev.of_node;
extcon_data->gpio = pdata->gpio;
+ extcon_data->edev.supported_cable = gpio_extcon_cable;
extcon_data->gpio_active_low = pdata->gpio_active_low;
extcon_data->state_on = pdata->state_on;
extcon_data->state_off = pdata->state_off;
@@ -135,8 +174,8 @@ static int gpio_extcon_probe(struct platform_device *pdev)
}

ret = request_any_context_irq(extcon_data->irq, gpio_irq_handler,
- pdata->irq_flags, pdev->name,
- extcon_data);
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ pdev->name, extcon_data);
if (ret < 0)
goto err;

@@ -177,6 +216,11 @@ static int gpio_extcon_resume(struct device *dev)
}
#endif

+static struct of_device_id of_gpio_match_tbl[] = {
+ { .compatible = "extcon-gpio", },
+ { /* end */ },
+};
+
static SIMPLE_DEV_PM_OPS(gpio_extcon_pm_ops, NULL, gpio_extcon_resume);

static struct platform_driver gpio_extcon_driver = {
@@ -184,6 +228,7 @@ static struct platform_driver gpio_extcon_driver = {
.remove = gpio_extcon_remove,
.driver = {
.name = "extcon-gpio",
+ .of_match_table = of_gpio_match_tbl,
.owner = THIS_MODULE,
.pm = &gpio_extcon_pm_ops,
},
diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
index 8900fdf..3850588 100644
--- a/include/linux/extcon/extcon-gpio.h
+++ b/include/linux/extcon/extcon-gpio.h
@@ -43,10 +43,10 @@
*/
struct gpio_extcon_platform_data {
const char *name;
+ const char *cable_name;
unsigned gpio;
bool gpio_active_low;
unsigned long debounce;
- unsigned long irq_flags;

/* if NULL, "0" or "1" will be printed */
const char *state_on;
--
1.7.9.5


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