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authorPhil Sutter <n0-1@freewrt.org>2009-03-05 02:27:15 -0500
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-03-09 23:10:12 -0400
commitd9bdffd2102404e8ea5f71c5b88dad890984164d (patch)
treec8deba7479dc3ba6140dd6c55742dbb16f819db7 /arch
parent73969ff0eda233f140bcbed1251431387b43f383 (diff)
Input: add driver for S1 button of rb532
Mikrotik's Routerboard 532 has two builtin buttons, from which one triggers a hardware reset. The other one is accessible through GPIO pin 1. Sadly, this pin is being multiplexed with UART0 input, so enabling it as interrupt source (as implied by the gpio-keys driver) is not possible unless UART0 has been turned off. The later one though is a rather bad idea as the Routerboard is an embedded device with only a single serial port, so it's almost always used as serial console device. This patch adds a driver based on INPUT_POLLDEV, which disables the UART and reconfigures GPIO pin 1 temporarily while reading the button state. This procedure works fine and has been tested as part of another, unpublished driver for this device. Signed-off-by: Phil Sutter <n0-1@freewrt.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/include/asm/mach-rc32434/gpio.h3
-rw-r--r--arch/mips/rb532/devices.c19
2 files changed, 4 insertions, 18 deletions
diff --git a/arch/mips/include/asm/mach-rc32434/gpio.h b/arch/mips/include/asm/mach-rc32434/gpio.h
index 3cb50d17b62d..12ee8d510160 100644
--- a/arch/mips/include/asm/mach-rc32434/gpio.h
+++ b/arch/mips/include/asm/mach-rc32434/gpio.h
@@ -80,6 +80,9 @@ struct rb532_gpio_reg {
80/* Compact Flash GPIO pin */ 80/* Compact Flash GPIO pin */
81#define CF_GPIO_NUM 13 81#define CF_GPIO_NUM 13
82 82
83/* S1 button GPIO (shared with UART0_SIN) */
84#define GPIO_BTN_S1 1
85
83extern void rb532_gpio_set_ilevel(int bit, unsigned gpio); 86extern void rb532_gpio_set_ilevel(int bit, unsigned gpio);
84extern void rb532_gpio_set_istat(int bit, unsigned gpio); 87extern void rb532_gpio_set_istat(int bit, unsigned gpio);
85extern void rb532_gpio_set_func(unsigned gpio); 88extern void rb532_gpio_set_func(unsigned gpio);
diff --git a/arch/mips/rb532/devices.c b/arch/mips/rb532/devices.c
index 4a5f05b662ae..9f40e1ff9b4f 100644
--- a/arch/mips/rb532/devices.c
+++ b/arch/mips/rb532/devices.c
@@ -200,26 +200,9 @@ static struct platform_device rb532_led = {
200 .id = -1, 200 .id = -1,
201}; 201};
202 202
203static struct gpio_keys_button rb532_gpio_btn[] = {
204 {
205 .gpio = 1,
206 .code = BTN_0,
207 .desc = "S1",
208 .active_low = 1,
209 }
210};
211
212static struct gpio_keys_platform_data rb532_gpio_btn_data = {
213 .buttons = rb532_gpio_btn,
214 .nbuttons = ARRAY_SIZE(rb532_gpio_btn),
215};
216
217static struct platform_device rb532_button = { 203static struct platform_device rb532_button = {
218 .name = "gpio-keys", 204 .name = "rb532-button",
219 .id = -1, 205 .id = -1,
220 .dev = {
221 .platform_data = &rb532_gpio_btn_data,
222 }
223}; 206};
224 207
225static struct resource rb532_wdt_res[] = { 208static struct resource rb532_wdt_res[] = {