This patch adds EV_KEYs for each of the 8 pushbuttons on the UI board via a gpio-key device.
The expander is a tca6416; it controls the SEL_{A,B,C} lines which enable and disable the peripherals found on the UI board in addition to the 8 pushbuttons mentioned above. The reason the existing tca6416-keypad driver is not employed is because there was no aparent way to keep the gpio lines used as SEL_{A,B,C} registered while simultaneously registering the pushbuttons as a tca6416-keypad instance. Some experimentation with the polling interval was performed; we were searching for the largest polling interval that did not affect the feel of the responsiveness of the buttons. It is very subjective but 200ms seems to be a good value that accepts firm pushes but rejects very light ones. The key values assigned to the buttons were arbitrarily chosen to be F1-F8. Signed-off-by: Ben Gardiner <bengardi...@nanometrics.ca> Reviewed-by: Chris Cordahi <christophercord...@nanometrics.ca> CC: Govindarajan, Sriramakrishnan <s...@ti.com> Reviewed-by: Sekhar Nori <nsek...@ti.com> Signed-off-by: Sekhar Nori <nsek...@ti.com> CC: Kevin Hilman <khil...@deeprootsystems.com> CC: Gabor Juhos <juh...@openwrt.org> --- Changes since v5: * use header and platform_data type from final polled gpio keys driver Changes since v4: * integrated the use of Gabor Juhos' polled gpio buttons driver * removed spurious whitespace change (Sekhar Nori) * don't linebreak error messages (Sekhar Nori) * kept the explicit static initialization of structure members in-place Changes since v3: * extracted Kconfig changes to patch 5/5 * fixed leading whitespace problem Changes since v2: * rebased to 083eae3e28643e0eefc5243719f8b1572cf98299 of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci.git * remove the "TODO : populate at runtime using" in this patch instead of 4/4 (Nori, Sekhar) * integrated the static array initialization patch of Sekhar Nori * use static array initialization ranges * rename DA850_PB_POLL_MS to DA850_GPIO_KEYS_POLL_MS * use shorter names prefixed with da850_evm Changes since v1: * set INPUT_POLLDEV default for DA850_EVM machine, but don't select it unconditionally * adding note to description about why tca6416-keypad was not used * adding Govindarajan, Sriramakrishnan, the author of the tca6416-keypad driver --- arch/arm/mach-davinci/board-da850-evm.c | 95 +++++++++++++++++++++++++++++++ 1 files changed, 95 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c index f89b0b7..4377679 100644 --- a/arch/arm/mach-davinci/board-da850-evm.c +++ b/arch/arm/mach-davinci/board-da850-evm.c @@ -17,8 +17,10 @@ #include <linux/i2c.h> #include <linux/i2c/at24.h> #include <linux/i2c/pca953x.h> +#include <linux/input.h> #include <linux/mfd/tps6507x.h> #include <linux/gpio.h> +#include <linux/gpio_keys.h> #include <linux/platform_device.h> #include <linux/mtd/mtd.h> #include <linux/mtd/nand.h> @@ -272,6 +274,87 @@ static inline void da850_evm_setup_emac_rmii(int rmii_sel) static inline void da850_evm_setup_emac_rmii(int rmii_sel) { } #endif + +#define DA850_KEYS_DEBOUNCE_MS 10 +/* + * At 200ms polling interval it is possible to miss an + * event by tapping very lightly on the push button but most + * pushes do result in an event; longer intervals require the + * user to hold the button whereas shorter intervals require + * more CPU time for polling. + */ +#define DA850_GPIO_KEYS_POLL_MS 200 + +enum da850_evm_ui_exp_pins { + DA850_EVM_UI_EXP_SEL_C = 5, + DA850_EVM_UI_EXP_SEL_B, + DA850_EVM_UI_EXP_SEL_A, + DA850_EVM_UI_EXP_PB8, + DA850_EVM_UI_EXP_PB7, + DA850_EVM_UI_EXP_PB6, + DA850_EVM_UI_EXP_PB5, + DA850_EVM_UI_EXP_PB4, + DA850_EVM_UI_EXP_PB3, + DA850_EVM_UI_EXP_PB2, + DA850_EVM_UI_EXP_PB1, +}; + +static const char const *da850_evm_ui_exp[] = { + [DA850_EVM_UI_EXP_SEL_C] = "sel_c", + [DA850_EVM_UI_EXP_SEL_B] = "sel_b", + [DA850_EVM_UI_EXP_SEL_A] = "sel_a", + [DA850_EVM_UI_EXP_PB8] = "pb8", + [DA850_EVM_UI_EXP_PB7] = "pb7", + [DA850_EVM_UI_EXP_PB6] = "pb6", + [DA850_EVM_UI_EXP_PB5] = "pb5", + [DA850_EVM_UI_EXP_PB4] = "pb4", + [DA850_EVM_UI_EXP_PB3] = "pb3", + [DA850_EVM_UI_EXP_PB2] = "pb2", + [DA850_EVM_UI_EXP_PB1] = "pb1", +}; + +#define DA850_N_UI_PB 8 + +static struct gpio_keys_button da850_evm_ui_keys[] = { + [0 ... DA850_N_UI_PB - 1] = { + .type = EV_KEY, + .active_low = 1, + .wakeup = 0, + .debounce_interval = DA850_KEYS_DEBOUNCE_MS, + .code = -1, /* assigned at runtime */ + .gpio = -1, /* assigned at runtime */ + .desc = NULL, /* assigned at runtime */ + }, +}; + +static struct gpio_keys_platform_data da850_evm_ui_keys_pdata = { + .buttons = da850_evm_ui_keys, + .nbuttons = ARRAY_SIZE(da850_evm_ui_keys), + .poll_interval = DA850_GPIO_KEYS_POLL_MS, +}; + +static struct platform_device da850_evm_ui_keys_device = { + .name = "gpio-keys-polled", + .id = 0, + .dev = { + .platform_data = &da850_evm_ui_keys_pdata + }, +}; + +static void da850_evm_ui_keys_init(unsigned gpio) +{ + int i; + struct gpio_keys_button *button; + + for (i = 0; i < DA850_N_UI_PB; i++) { + button = &da850_evm_ui_keys[i]; + button->code = KEY_F8 - i; + button->desc = (char *) + da850_evm_ui_exp[DA850_EVM_UI_EXP_PB8 + i]; + button->gpio = gpio + DA850_EVM_UI_EXP_PB8 + i; + } +} + static int da850_evm_ui_expander_setup(struct i2c_client *client, unsigned gpio, unsigned ngpio, void *c) { @@ -304,6 +387,13 @@ static int da850_evm_ui_expander_setup(struct i2c_client *client, unsigned gpio, gpio_direction_output(sel_b, 1); gpio_direction_output(sel_c, 1); + da850_evm_ui_keys_init(gpio); + ret = platform_device_register(&da850_evm_ui_keys_device); + if (ret) { + pr_warning("Could not register UI GPIO expander push-buttons"); + goto exp_setup_keys_fail; + } + ui_card_detected = 1; pr_info("DA850/OMAP-L138 EVM UI card detected\n"); @@ -313,6 +403,8 @@ static int da850_evm_ui_expander_setup(struct i2c_client *client, unsigned gpio, return 0; +exp_setup_keys_fail: + gpio_free(sel_c); exp_setup_selc_fail: gpio_free(sel_b); exp_setup_selb_fail: @@ -324,6 +416,8 @@ exp_setup_sela_fail: static int da850_evm_ui_expander_teardown(struct i2c_client *client, unsigned gpio, unsigned ngpio, void *c) { + platform_device_unregister(&da850_evm_ui_keys_device); + /* deselect all functionalities */ gpio_set_value_cansleep(gpio + 5, 1); gpio_set_value_cansleep(gpio + 6, 1); @@ -340,6 +434,7 @@ static struct pca953x_platform_data da850_evm_ui_expander_info = { .gpio_base = DAVINCI_N_GPIO, .setup = da850_evm_ui_expander_setup, .teardown = da850_evm_ui_expander_teardown, + .names = da850_evm_ui_exp, }; static struct i2c_board_info __initdata da850_evm_i2c_devices[] = { -- 1.7.0.4 _______________________________________________ Davinci-linux-open-source mailing list Davinci-linux-open-source@linux.davincidsp.com http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source