xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

gpio: Add bitmask to block requests to unavailable stmpe GPIOs

Browse Source 
GPIOs on these controller are multi-functional. If you decided to use
some of them e.g. as input channels for the ADC, you surely don't want
those pins to be reassigned as simple GPIOs (which may be triggered even
from userspace via 'export'). Same for the touchscreen controller pins.
Since knowledge about the hardware is needed to decide which GPIOs to
reserve, let this bitmask be inside platform_data and provide some
defines to assist potential users.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Rabin Vincent <rabin.vincent@stericsson.com>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Wolfram Sang
2010-08-16 17:14:44 +02:00
committed by Samuel Ortiz
parent 8c96aefbe7
commit b8e9cf0b28
2 changed files with 11 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/mfd/stmpe.h
View File

@@ -112,13 +112,19 @@ struct stmpe_keypad_platform_data {
bool no_autorepeat;
};
#define STMPE_GPIO_NOREQ_811_TOUCH (0xf0)
/**
* struct stmpe_gpio_platform_data - STMPE GPIO platform data
* @gpio_base: first gpio number assigned. A maximum of
* %STMPE_NR_GPIOS GPIOs will be allocated.
* @norequest_mask: bitmask specifying which GPIOs should _not_ be
* requestable due to different usage (e.g. touch, keypad)
* STMPE_GPIO_NOREQ_* macros can be used here.
*/
struct stmpe_gpio_platform_data {
int gpio_base;
unsigned norequest_mask;
void (*setup)(struct stmpe *stmpe, unsigned gpio_base);
void (*remove)(struct stmpe *stmpe, unsigned gpio_base);
};