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Subject[PATCH 7/8] Input: tm2-touchkey: Add support for aries touchkey variant
Date
From: Jonathan Bakker <xc-racer2@live.ca>

The touchkey variant found on aries board is slighty different,
it uses a fixed regulator and writes/read to the same place

Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
---
drivers/input/keyboard/tm2-touchkey.c | 56 +++++++++++++++++++++++----
1 file changed, 49 insertions(+), 7 deletions(-)

diff --git a/drivers/input/keyboard/tm2-touchkey.c b/drivers/input/keyboard/tm2-touchkey.c
index ebc275ab8ad1..6f1235183c21 100644
--- a/drivers/input/keyboard/tm2-touchkey.c
+++ b/drivers/input/keyboard/tm2-touchkey.c
@@ -28,7 +28,10 @@

#define TM2_TOUCHKEY_DEV_NAME "tm2-touchkey"
#define MIDAS_TOUCHKEY_DEV_NAME "midas-touchkey"
+#define ARIES_TOUCHKEY_DEV_NAME "aries-touchkey"

+#define ARIES_TOUCHKEY_CMD_LED_ON 0x1
+#define ARIES_TOUCHKEY_CMD_LED_OFF 0x2
#define TM2_TOUCHKEY_CMD_LED_ON 0x10
#define TM2_TOUCHKEY_CMD_LED_OFF 0x20
#define TM2_TOUCHKEY_BIT_PRESS_EV BIT(3)
@@ -40,6 +43,10 @@ struct touchkey_variant {
const char *name;
u8 keycode_reg;
u8 base_reg;
+ u8 cmd_led_on;
+ u8 cmd_led_off;
+ bool no_reg;
+ bool fixed_regulator;
};

struct tm2_touchkey_data {
@@ -57,12 +64,24 @@ static struct touchkey_variant tm2_touchkey_variant = {
.name = TM2_TOUCHKEY_DEV_NAME,
.keycode_reg = 0x03,
.base_reg = 0x00,
+ .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
+ .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
};

static struct touchkey_variant midas_touchkey_variant = {
.name = MIDAS_TOUCHKEY_DEV_NAME,
.keycode_reg = 0x00,
.base_reg = 0x00,
+ .cmd_led_on = TM2_TOUCHKEY_CMD_LED_ON,
+ .cmd_led_off = TM2_TOUCHKEY_CMD_LED_OFF,
+};
+
+static struct touchkey_variant aries_touchkey_variant = {
+ .name = ARIES_TOUCHKEY_DEV_NAME,
+ .no_reg = true,
+ .fixed_regulator = true,
+ .cmd_led_on = ARIES_TOUCHKEY_CMD_LED_ON,
+ .cmd_led_off = ARIES_TOUCHKEY_CMD_LED_OFF,
};

static void tm2_touchkey_led_brightness_set(struct led_classdev *led_dev,
@@ -75,15 +94,20 @@ static void tm2_touchkey_led_brightness_set(struct led_classdev *led_dev,

if (brightness == LED_OFF) {
volt = TM2_TOUCHKEY_LED_VOLTAGE_MIN;
- data = TM2_TOUCHKEY_CMD_LED_OFF;
+ data = touchkey->variant->cmd_led_off;
} else {
volt = TM2_TOUCHKEY_LED_VOLTAGE_MAX;
- data = TM2_TOUCHKEY_CMD_LED_ON;
+ data = touchkey->variant->cmd_led_on;
}

- regulator_set_voltage(touchkey->vdd, volt, volt);
- i2c_smbus_write_byte_data(touchkey->client,
- touchkey->variant->base_reg, data);
+ if (!touchkey->variant->fixed_regulator)
+ regulator_set_voltage(touchkey->vdd, volt, volt);
+
+ if (touchkey->variant->no_reg)
+ i2c_smbus_write_byte(touchkey->client, data);
+ else
+ i2c_smbus_write_byte_data(touchkey->client,
+ touchkey->variant->base_reg, data);
}

static int tm2_touchkey_power_enable(struct tm2_touchkey_data *touchkey)
@@ -116,8 +140,11 @@ static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid)
int index;
int i;

- data = i2c_smbus_read_byte_data(touchkey->client,
- touchkey->variant->keycode_reg);
+ if (touchkey->variant->no_reg)
+ data = i2c_smbus_read_byte(touchkey->client);
+ else
+ data = i2c_smbus_read_byte_data(touchkey->client,
+ touchkey->variant->keycode_reg);
if (data < 0) {
dev_err(&touchkey->client->dev,
"failed to read i2c data: %d\n", data);
@@ -143,6 +170,14 @@ static irqreturn_t tm2_touchkey_irq_handler(int irq, void *devid)
input_sync(touchkey->input_dev);

out:
+ if (touchkey->variant->fixed_regulator &&
+ data & TM2_TOUCHKEY_BIT_PRESS_EV) {
+ /* touch turns backlight on, so make sure we're in sync */
+ if (touchkey->led_dev.brightness == LED_OFF)
+ tm2_touchkey_led_brightness_set(&touchkey->led_dev,
+ LED_OFF);
+ }
+
return IRQ_HANDLED;
}

@@ -251,6 +286,9 @@ static int tm2_touchkey_probe(struct i2c_client *client,
return error;
}

+ if (touchkey->variant->fixed_regulator)
+ tm2_touchkey_led_brightness_set(&touchkey->led_dev, LED_ON);
+
return 0;
}

@@ -286,6 +324,7 @@ static SIMPLE_DEV_PM_OPS(tm2_touchkey_pm_ops,
static const struct i2c_device_id tm2_touchkey_id_table[] = {
{ TM2_TOUCHKEY_DEV_NAME, 0 },
{ MIDAS_TOUCHKEY_DEV_NAME, 0 },
+ { ARIES_TOUCHKEY_DEV_NAME, 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tm2_touchkey_id_table);
@@ -297,6 +336,9 @@ static const struct of_device_id tm2_touchkey_of_match[] = {
}, {
.compatible = "cypress,midas-touchkey",
.data = &midas_touchkey_variant,
+ }, {
+ .compatible = "cypress,aries-touchkey",
+ .data = &aries_touchkey_variant,
},
{ },
};
--
2.17.1
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