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Date: Mon, 26 Nov 2012 10:43:41 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 2/5] Input: bu21013_ts - Move GPIO init and exit
functions into the driver
On Fri, 23 Nov 2012, Dmitry Torokhov wrote:
> Hi Lee,
>
> On Thu, Nov 22, 2012 at 12:10:30PM +0000, Lee Jones wrote:
> >
> > /**
> > + * bu21013_gpio_board_init() - configures the touch panel
> > + * @reset_pin: reset pin number
> > + *
> > + * This function is used to configure the voltage and
> > + * reset the touch panel controller.
> > + */
> > +static int bu21013_gpio_board_init(int reset_pin)
> > +{
> > + int retval = 0;
> > +
> > + 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;
> > + }
>
> gpio_request_one() is handy here.
Okay, I'll look into that.
> > +
> > + return retval;
> > +}
> > +
> > +/**
> > + * bu21013_gpio_board_exit() - deconfigures the touch panel controller
> > + * @reset_pin: reset pin number
> > + *
> > + * This function is used to deconfigure the chip selection
> > + * for touch panel controller.
> > + */
> > +static int bu21013_gpio_board_exit(int reset_pin)
> > +{
> > + int retval = 0;
> > +
> > + 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);
> > +
>
> You ate forgetting to free gpio here. TBH the original did forget too.
>
>
> > + return retval;
> > +}
> > +
> > +/**
> > * bu21013_init_chip() - power on sequence for the bu21013 controller
> > * @data: device structure pointer
> > *
> > @@ -449,6 +498,8 @@ static int __devinit bu21013_probe(struct i2c_client *client,
> > return -EINVAL;
> > }
> >
> > + pdata->irq = gpio_to_irq(pdata->touch_pin);
> > +
>
> Does it even compile? pdata is const...
>
> Does the version below still work for you?
The version I sent you works. I have a working touchscreen.
> Thanks.
>
> --
> Dmitry
>
> Input: bu21013_ts - move GPIO init and exit functions into the driver
>
> From: Lee Jones <lee.jones@...aro.org>
>
> These GPIO init and exit functions have no place in platform data, they
> should be part of the driver instead,
>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> arch/arm/mach-ux500/board-mop500-stuib.c | 95 +-----------------------------
> drivers/input/touchscreen/bu21013_ts.c | 69 ++++++++++++++++------
> include/linux/input/bu21013.h | 9 +--
> 3 files changed, 56 insertions(+), 117 deletions(-)
>
> diff --git a/arch/arm/mach-ux500/board-mop500-stuib.c b/arch/arm/mach-ux500/board-mop500-stuib.c
> index 8c97977..1243428 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
> @@ -88,85 +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_x_max = TOUCH_XMAX,
> - .touch_y_max = TOUCH_YMAX,
> - .ext_clk = false,
> - .x_flip = false,
> - .y_flip = true,
> -};
> -
> -static struct bu21013_platform_device tsc_plat2_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,
> @@ -181,21 +101,14 @@ static struct i2c_board_info __initdata u8500_i2c3_devices_stuib[] = {
> },
> {
> I2C_BOARD_INFO("bu21013_tp", 0x5D),
> - .platform_data = &tsc_plat2_device,
> + .platform_data = &tsc_plat_device,
> },
> -
> };
>
> void __init mop500_stuib_init(void)
> {
> - if (machine_is_hrefv60()) {
> - tsc_plat_device.cs_pin = HREFV60_TOUCH_RST_GPIO;
> - tsc_plat2_device.cs_pin = HREFV60_TOUCH_RST_GPIO;
> - } else {
> - tsc_plat_device.cs_pin = GPIO_BU21013_CS;
> - tsc_plat2_device.cs_pin = GPIO_BU21013_CS;
> -
> - }
> + tsc_plat_device.cs_pin = machine_is_hrefv60() ?
> + HREFV60_TOUCH_RST_GPIO : GPIO_BU21013_CS;
>
> mop500_uib_i2c_add(0, mop500_i2c0_devices_stuib,
> ARRAY_SIZE(mop500_i2c0_devices_stuib));
> diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c
> index 1e8cddd..88f4252 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 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 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 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 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_DIR_OUT | GPIOF_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 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 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 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;
--
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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