On Thu, Feb 03, 2011 at 08:54:05AM -0800, Dmitry Torokhov wrote:
> On Thu, Feb 03, 2011 at 08:51:46PM +0530, Sourav Poddar wrote:
> > The ads7846 driver requests a gpio but does not currently
> > configure it explicitly as an input. Use gpio_request_one
> > to request and configure it at one shot.
> >
> > Signed-off-by: Sourav Poddar <sourav.pod...@ti.com>
> > Cc: Dmitry Torokhov <d...@mail.ru>
>
> Will apply this one, the other one is a bit messy IMO, will have to
> think about it.
>
Something like below should do I think.
--
Dmitry
Input: ads7846 - check proper condition when freeing gpio
From: Dmitry Torokhov <dmitry.torok...@gmail.com>
When driver uses custom pendown detection method gpio_pendown is not
set up and so we should not try to free it, otherwise we are presented
with:
------------[ cut here ]------------
WARNING: at drivers/gpio/gpiolib.c:1258 gpio_free+0x100/0x12c()
Modules linked in:
[<c0061208>] (unwind_backtrace+0x0/0xe4) from
[<c0091f58>](warn_slowpath_common+0x4c/0x64)
[<c0091f58>] (warn_slowpath_common+0x4c/0x64) from
[<c0091f88>](warn_slowpath_null+0x18/0x1c)
[<c0091f88>] (warn_slowpath_null+0x18/0x1c) from
[<c024e610>](gpio_free+0x100/0x12c)
[<c024e610>] (gpio_free+0x100/0x12c) from
[<c03e9fbc>](ads7846_probe+0xa38/0xc5c)
[<c03e9fbc>] (ads7846_probe+0xa38/0xc5c) from
[<c02cff14>](spi_drv_probe+0x18/0x1c)
[<c02cff14>] (spi_drv_probe+0x18/0x1c) from
[<c028bca4>](driver_probe_device+0xc8/0x184)
[<c028bca4>] (driver_probe_device+0xc8/0x184) from
[<c028bdc8>](__driver_attach+0x68/0x8c)
[<c028bdc8>] (__driver_attach+0x68/0x8c) from
[<c028b4c8>](bus_for_each_dev+0x48/0x74)
[<c028b4c8>] (bus_for_each_dev+0x48/0x74) from
[<c028ae08>](bus_add_driver+0xa0/0x220)
[<c028ae08>] (bus_add_driver+0xa0/0x220) from
[<c028c0c0>](driver_register+0xa8/0x134)
[<c028c0c0>] (driver_register+0xa8/0x134) from
[<c0050550>](do_one_initcall+0xcc/0x1a4)
[<c0050550>] (do_one_initcall+0xcc/0x1a4) from
[<c00084e4>](kernel_init+0x14c/0x214)
[<c00084e4>] (kernel_init+0x14c/0x214) from
[<c005b494>](kernel_thread_exit+0x0/0x8)
---[ end trace 4053287f8a5ec18f ]---
Also rearrange ads7846_setup_pendown() to have only one exit point
returning success.
Reported-by: Sourav Poddar <sourav.pod...@ti.com>
Signed-off-by: Dmitry Torokhov <d...@mail.ru>
---
drivers/input/touchscreen/ads7846.c | 39 ++++++++++++++++++++---------------
1 files changed, 22 insertions(+), 17 deletions(-)
diff --git a/drivers/input/touchscreen/ads7846.c
b/drivers/input/touchscreen/ads7846.c
index 0e9492d..b1217e1 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -946,30 +946,30 @@ static int __devinit ads7846_setup_pendown(struct
spi_device *spi, struct ads784
struct ads7846_platform_data *pdata = spi->dev.platform_data;
int err;
- /* REVISIT when the irq can be triggered active-low, or if for some
+ /*
+ * REVISIT when the irq can be triggered active-low, or if for some
* reason the touchscreen isn't hooked up, we don't need to access
* the pendown state.
*/
- if (!pdata->get_pendown_state && !gpio_is_valid(pdata->gpio_pendown)) {
- dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
- return -EINVAL;
- }
if (pdata->get_pendown_state) {
ts->get_pendown_state = pdata->get_pendown_state;
- return 0;
- }
+ } else if (gpio_is_valid(pdata->gpio_pendown)) {
+
+ err = gpio_request_one(pdata->gpio_pendown, GPIOF_DIR_IN,
+ "ads7846_pendown");
+ if (err) {
+ dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
+ pdata->gpio_pendown);
+ return err;
+ }
- err = gpio_request_one(pdata->gpio_pendown, GPIOF_DIR_IN,
- "ads7846_pendown");
- if (err) {
- dev_err(&spi->dev, "failed to request pendown GPIO%d\n",
- pdata->gpio_pendown);
- return err;
+ ts->gpio_pendown = pdata->gpio_pendown;
+ } else {
+ dev_err(&spi->dev, "no get_pendown_state nor gpio_pendown?\n");
+ return -EINVAL;
}
- ts->gpio_pendown = pdata->gpio_pendown;
-
return 0;
}
@@ -1359,7 +1359,7 @@ static int __devinit ads7846_probe(struct spi_device *spi)
err_put_regulator:
regulator_put(ts->reg);
err_free_gpio:
- if (ts->gpio_pendown != -1)
+ if (!ts->get_pendown_state)
gpio_free(ts->gpio_pendown);
err_cleanup_filter:
if (ts->filter_cleanup)
@@ -1389,8 +1389,13 @@ static int __devexit ads7846_remove(struct spi_device
*spi)
regulator_disable(ts->reg);
regulator_put(ts->reg);
- if (ts->gpio_pendown != -1)
+ if (!ts->get_pendown_state) {
+ /*
+ * If we are not using specialized pendown method we must
+ * have been relying on gpio we set up ourselves.
+ */
gpio_free(ts->gpio_pendown);
+ }
if (ts->filter_cleanup)
ts->filter_cleanup(ts->filter_data);
--
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