[PATCH 2/3] Input: bu21013_ts - Move GPIO init and exit functions into the driver
Lee Jones
lee.jones at linaro.org
Tue Nov 27 08:13:09 EST 2012
These GPIO init and exit functions have no place in platform data.
Instead they should be part of the driver. This patch moves them to
their rightful place, which subsequently elevates platform data of
yet more cruft.
Cc: linux-input at vger.kernel.org
Acked-by: Arnd Bergmann <arnd at arndb.de>
Acked-by: Linus Walleij <linus.walleij at linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
Signed-off-by: Lee Jones <lee.jones at linaro.org>
Signed-off-by: Lee Jones <lee.jones at linaro.org>
---
arch/arm/mach-ux500/board-mop500-stuib.c | 71 +-----------------------------
drivers/input/touchscreen/bu21013_ts.c | 69 +++++++++++++++++++++--------
include/linux/input/bu21013.h | 9 +---
3 files changed, 53 insertions(+), 96 deletions(-)
diff --git a/arch/arm/mach-ux500/board-mop500-stuib.c b/arch/arm/mach-ux500/board-mop500-stuib.c
index 564f57d..7e1f294 100644
--- a/arch/arm/mach-ux500/board-mop500-stuib.c
+++ b/arch/arm/mach-ux500/board-mop500-stuib.c
@@ -77,9 +77,6 @@ static struct i2c_board_info __initdata mop500_i2c0_devices_stuib[] = {
* BU21013 ROHM touchscreen interface on the STUIBs
*/
-/* tracks number of bu21013 devices being enabled */
-static int bu21013_devices;
-
#define TOUCH_GPIO_PIN 84
#define TOUCH_XMAX 384
@@ -88,73 +85,8 @@ static int bu21013_devices;
#define PRCMU_CLOCK_OCR 0x1CC
#define TSC_EXT_CLOCK_9_6MHZ 0x840000
-/**
- * bu21013_gpio_board_init : configures the touch panel.
- * @reset_pin: reset pin number
- * This function can be used to configures
- * the voltage and reset the touch panel controller.
- */
-static int bu21013_gpio_board_init(int reset_pin)
-{
- int retval = 0;
-
- bu21013_devices++;
- if (bu21013_devices == 1) {
- retval = gpio_request(reset_pin, "touchp_reset");
- if (retval) {
- printk(KERN_ERR "Unable to request gpio reset_pin");
- return retval;
- }
- retval = gpio_direction_output(reset_pin, 1);
- if (retval < 0) {
- printk(KERN_ERR "%s: gpio direction failed\n",
- __func__);
- return retval;
- }
- }
-
- return retval;
-}
-
-/**
- * bu21013_gpio_board_exit : deconfigures the touch panel controller
- * @reset_pin: reset pin number
- * This function can be used to deconfigures the chip selection
- * for touch panel controller.
- */
-static int bu21013_gpio_board_exit(int reset_pin)
-{
- int retval = 0;
-
- if (bu21013_devices == 1) {
- retval = gpio_direction_output(reset_pin, 0);
- if (retval < 0) {
- printk(KERN_ERR "%s: gpio direction failed\n",
- __func__);
- return retval;
- }
- gpio_set_value(reset_pin, 0);
- }
- bu21013_devices--;
-
- return retval;
-}
-
-/**
- * bu21013_read_pin_val : get the interrupt pin value
- * This function can be used to get the interrupt pin value for touch panel
- * controller.
- */
-static int bu21013_read_pin_val(void)
-{
- return gpio_get_value(TOUCH_GPIO_PIN);
-}
-
static struct bu21013_platform_device tsc_plat_device = {
- .cs_en = bu21013_gpio_board_init,
- .cs_dis = bu21013_gpio_board_exit,
- .irq_read_val = bu21013_read_pin_val,
- .irq = NOMADIK_GPIO_TO_IRQ(TOUCH_GPIO_PIN),
+ .touch_pin = TOUCH_GPIO_PIN,
.touch_x_max = TOUCH_XMAX,
.touch_y_max = TOUCH_YMAX,
.ext_clk = false,
@@ -171,7 +103,6 @@ static struct i2c_board_info __initdata u8500_i2c3_devices_stuib[] = {
I2C_BOARD_INFO("bu21013_tp", 0x5D),
.platform_data = &tsc_plat_device,
},
-
};
void __init mop500_stuib_init(void)
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c
index 2fae682..8982bea 100644
--- a/drivers/input/touchscreen/bu21013_ts.c
+++ b/drivers/input/touchscreen/bu21013_ts.c
@@ -14,6 +14,7 @@
#include <linux/slab.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
+#include <linux/gpio.h>
#define PEN_DOWN_INTR 0
#define MAX_FINGERS 2
@@ -148,11 +149,12 @@
struct bu21013_ts_data {
struct i2c_client *client;
wait_queue_head_t wait;
- bool touch_stopped;
const struct bu21013_platform_device *chip;
struct input_dev *in_dev;
- unsigned int intr_pin;
struct regulator *regulator;
+ unsigned int irq;
+ unsigned int intr_pin;
+ bool touch_stopped;
};
/**
@@ -262,7 +264,7 @@ static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
return IRQ_NONE;
}
- data->intr_pin = data->chip->irq_read_val();
+ data->intr_pin = gpio_get_value(data->chip->touch_pin);
if (data->intr_pin == PEN_DOWN_INTR)
wait_event_timeout(data->wait, data->touch_stopped,
msecs_to_jiffies(2));
@@ -418,10 +420,33 @@ static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
{
bu21013_data->touch_stopped = true;
wake_up(&bu21013_data->wait);
- free_irq(bu21013_data->chip->irq, bu21013_data);
+ free_irq(bu21013_data->irq, bu21013_data);
}
/**
+ * bu21013_cs_disable() - deconfigures the touch panel controller
+ * @bu21013_data: device structure pointer
+ *
+ * This function is used to deconfigure the chip selection
+ * for touch panel controller.
+ */
+static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data)
+{
+ int error;
+
+ error = gpio_direction_output(bu21013_data->chip->cs_pin, 0);
+ if (error < 0)
+ dev_warn(&bu21013_data->client->dev,
+ "%s: gpio direction failed, error: %d\n",
+ __func__, error);
+ else
+ gpio_set_value(bu21013_data->chip->cs_pin, 0);
+
+ gpio_free(bu21013_data->chip->cs_pin);
+}
+
+
+/**
* bu21013_probe() - initializes the i2c-client touchscreen driver
* @client: i2c client structure pointer
* @id: i2c device id pointer
@@ -430,7 +455,7 @@ static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
* driver and returns integer.
*/
static int __devinit bu21013_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+ const struct i2c_device_id *id)
{
struct bu21013_ts_data *bu21013_data;
struct input_dev *in_dev;
@@ -449,6 +474,11 @@ static int __devinit bu21013_probe(struct i2c_client *client,
return -EINVAL;
}
+ if (!gpio_is_valid(pdata->touch_pin)) {
+ dev_err(&client->dev, "invalid touch_pin supplied\n");
+ return -EINVAL;
+ }
+
bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL);
in_dev = input_allocate_device();
if (!bu21013_data || !in_dev) {
@@ -460,6 +490,7 @@ static int __devinit bu21013_probe(struct i2c_client *client,
bu21013_data->in_dev = in_dev;
bu21013_data->chip = pdata;
bu21013_data->client = client;
+ bu21013_data->irq = gpio_to_irq(pdata->touch_pin);
bu21013_data->regulator = regulator_get(&client->dev, "avdd");
if (IS_ERR(bu21013_data->regulator)) {
@@ -478,12 +509,11 @@ static int __devinit bu21013_probe(struct i2c_client *client,
init_waitqueue_head(&bu21013_data->wait);
/* configure the gpio pins */
- if (pdata->cs_en) {
- error = pdata->cs_en(pdata->cs_pin);
- if (error < 0) {
- dev_err(&client->dev, "chip init failed\n");
- goto err_disable_regulator;
- }
+ error = gpio_request_one(pdata->cs_pin, GPIOF_OUT_INIT_HIGH,
+ "touchp_reset");
+ if (error < 0) {
+ dev_err(&client->dev, "Unable to request gpio reset_pin\n");
+ goto err_disable_regulator;
}
/* configure the touch panel controller */
@@ -508,12 +538,13 @@ static int __devinit bu21013_probe(struct i2c_client *client,
pdata->touch_y_max, 0, 0);
input_set_drvdata(in_dev, bu21013_data);
- error = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq,
+ error = request_threaded_irq(bu21013_data->irq, NULL, bu21013_gpio_irq,
IRQF_TRIGGER_FALLING | IRQF_SHARED |
IRQF_ONESHOT,
DRIVER_TP, bu21013_data);
if (error) {
- dev_err(&client->dev, "request irq %d failed\n", pdata->irq);
+ dev_err(&client->dev, "request irq %d failed\n",
+ bu21013_data->irq);
goto err_cs_disable;
}
@@ -531,7 +562,7 @@ static int __devinit bu21013_probe(struct i2c_client *client,
err_free_irq:
bu21013_free_irq(bu21013_data);
err_cs_disable:
- pdata->cs_dis(pdata->cs_pin);
+ bu21013_cs_disable(bu21013_data);
err_disable_regulator:
regulator_disable(bu21013_data->regulator);
err_put_regulator:
@@ -555,7 +586,7 @@ static int __devexit bu21013_remove(struct i2c_client *client)
bu21013_free_irq(bu21013_data);
- bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin);
+ bu21013_cs_disable(bu21013_data);
input_unregister_device(bu21013_data->in_dev);
@@ -584,9 +615,9 @@ static int bu21013_suspend(struct device *dev)
bu21013_data->touch_stopped = true;
if (device_may_wakeup(&client->dev))
- enable_irq_wake(bu21013_data->chip->irq);
+ enable_irq_wake(bu21013_data->irq);
else
- disable_irq(bu21013_data->chip->irq);
+ disable_irq(bu21013_data->irq);
regulator_disable(bu21013_data->regulator);
@@ -621,9 +652,9 @@ static int bu21013_resume(struct device *dev)
bu21013_data->touch_stopped = false;
if (device_may_wakeup(&client->dev))
- disable_irq_wake(bu21013_data->chip->irq);
+ disable_irq_wake(bu21013_data->irq);
else
- enable_irq(bu21013_data->chip->irq);
+ enable_irq(bu21013_data->irq);
return 0;
}
diff --git a/include/linux/input/bu21013.h b/include/linux/input/bu21013.h
index 05e0328..3ad1be5 100644
--- a/include/linux/input/bu21013.h
+++ b/include/linux/input/bu21013.h
@@ -9,13 +9,11 @@
/**
* struct bu21013_platform_device - Handle the platform data
- * @cs_en: pointer to the cs enable function
- * @cs_dis: pointer to the cs disable function
- * @irq_read_val: pointer to read the pen irq value function
* @touch_x_max: touch x max
* @touch_y_max: touch y max
* @cs_pin: chip select pin
* @irq: irq pin
+ * @touch_pin: touch gpio pin
* @ext_clk: external clock flag
* @x_flip: x flip flag
* @y_flip: y flip flag
@@ -24,13 +22,10 @@
* This is used to handle the platform data
*/
struct bu21013_platform_device {
- int (*cs_en)(int reset_pin);
- int (*cs_dis)(int reset_pin);
- int (*irq_read_val)(void);
int touch_x_max;
int touch_y_max;
unsigned int cs_pin;
- unsigned int irq;
+ unsigned int touch_pin;
bool ext_clk;
bool x_flip;
bool y_flip;
--
1.7.9.5
More information about the linux-arm-kernel
mailing list