Platform: x86: chromeos_laptop - Add Pixel Trackpad

Instantiate the atmel mxt224s trackpad on this system.
The trackpad may appear at two possible addresses:
0x4b in operational mode.
0x25 in bootloader mode.

Signed-off-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/platform/x86/chromeos_laptop.c b/drivers/platform/x86/chromeos_laptop.c
index bc6599c5bbe4..577e64d9f0ac 100644
--- a/drivers/platform/x86/chromeos_laptop.c
+++ b/drivers/platform/x86/chromeos_laptop.c
@@ -25,6 +25,8 @@
 #include <linux/i2c.h>
 #include <linux/module.h>
 
+#define ATMEL_TP_I2C_ADDR       0x4b
+#define ATMEL_TP_I2C_BL_ADDR    0x25
 #define CYAPA_TP_I2C_ADDR       0x67
 #define ISL_ALS_I2C_ADDR        0x44
 #define TAOS_ALS_I2C_ADDR       0x29
@@ -58,6 +60,12 @@ static struct i2c_board_info __initdata tsl2563_als_device = {
         I2C_BOARD_INFO("tsl2563", TAOS_ALS_I2C_ADDR),
 };
 
+static struct i2c_board_info __initdata atmel_224s_tp_device = {
+        I2C_BOARD_INFO("atmel_mxt_tp", ATMEL_TP_I2C_ADDR),
+        .platform_data = NULL,
+        .flags          = I2C_CLIENT_WAKE,
+};
+
 static struct i2c_client __init *__add_probed_i2c_device(
                 const char *name,
                 int bus,
@@ -161,6 +169,19 @@ static int __init setup_cyapa_smbus_tp(const struct dmi_system_id *id)
         return 0;
 }
 
+static int __init setup_atmel_224s_tp(const struct dmi_system_id *id)
+{
+        const unsigned short addr_list[] = { ATMEL_TP_I2C_BL_ADDR,
+                                             ATMEL_TP_I2C_ADDR,
+                                             I2C_CLIENT_END };
+
+        /* add atmel mxt touchpad on VGA DDC GMBus */
+        tp = add_probed_i2c_device("trackpad", I2C_ADAPTER_VGADDC,
+                                   &atmel_224s_tp_device, addr_list);
+        return 0;
+}
+
+
 static int __init setup_isl29018_als(const struct dmi_system_id *id)
 {
         /* add isl29018 light sensor */
@@ -192,6 +213,14 @@ static struct dmi_system_id __initdata chromeos_laptop_dmi_table[] = {
                 .callback = setup_cyapa_smbus_tp,
         },
         {
+                .ident = "Chromebook Pixel - Touchpad",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
+                },
+                .callback = setup_atmel_224s_tp,
+        },
+        {
                 .ident = "Samsung Series 5 550 - Light Sensor",
                 .matches = {
                         DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG"),