da850-evm: add UI Expander pushbuttons

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 <bengardiner@nanometrics.ca>
Reviewed-by: Chris Cordahi <christophercordahi@nanometrics.ca>
CC: Govindarajan, Sriramakrishnan <srk@ti.com>
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
CC: Kevin Hilman <khilman@deeprootsystems.com>
CC: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

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 fbdbd584cdf4..93bd43e93c45 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[] = {