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V4L/DVB (11607): soc-camera: add a free_bus method to struct soc_camera_link

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Currently pcm990 camera bus-width management functions request a GPIO and never
free it again. With this approach the GPIO extender driver cannot be unloaded
once camera drivers have been loaded, also unloading theb i2c-pxa bus driver
produces errors, because the GPIO extender driver cannot unregister properly.
Another problem is, that if camera drivers are once loaded before the GPIO
extender driver, the platform code marks the GPIO unavailable and only a reboot
helps to recover. Adding an explicit free_bus method and using it in mt9m001
and mt9v022 drivers fixes these problems.

Signed-off-by: Guennadi Liakhovetski <[email protected]>
Acked-by: Eric Miao <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Guennadi Liakhovetski 2009-04-24 12:53:51 -03:00 • committed by Mauro Carvalho Chehab
commit 594bb46dbc
4 changed files with 23 additions and 7 deletions
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23
arch/arm/mach-pxa/pcm990-baseboard.c
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@ -380,12 +380,12 @@ static struct pca953x_platform_data pca9536_data = {
.gpio_base = NR_BUILTIN_GPIO,
};
static int gpio_bus_switch;
static int gpio_bus_switch = -EINVAL;
static int pcm990_camera_set_bus_param(struct soc_camera_link *link,
unsigned long flags)
unsigned long flags)
{
if (gpio_bus_switch <= 0) {
if (gpio_bus_switch < 0) {
if (flags == SOCAM_DATAWIDTH_10)
return 0;
else
@ -404,25 +404,34 @@ static unsigned long pcm990_camera_query_bus_param(struct soc_camera_link *link)
{
int ret;
if (!gpio_bus_switch) {
if (gpio_bus_switch < 0) {
ret = gpio_request(NR_BUILTIN_GPIO, "camera");
if (!ret) {
gpio_bus_switch = NR_BUILTIN_GPIO;
gpio_direction_output(gpio_bus_switch, 0);
} else
gpio_bus_switch = -EINVAL;
}
}
if (gpio_bus_switch > 0)
if (gpio_bus_switch >= 0)
return SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_10;
else
return SOCAM_DATAWIDTH_10;
}
static void pcm990_camera_free_bus(struct soc_camera_link *link)
{
if (gpio_bus_switch < 0)
return;
gpio_free(gpio_bus_switch);
gpio_bus_switch = -EINVAL;
}
static struct soc_camera_link iclink = {
.bus_id = 0, /* Must match with the camera ID above */
.query_bus_param = pcm990_camera_query_bus_param,
.set_bus_param = pcm990_camera_set_bus_param,
.free_bus = pcm990_camera_free_bus,
};
/* Board I2C devices. */