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path: root/drivers/input/keyboard/mpr121_touchkey.c
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Diffstat (limited to 'drivers/input/keyboard/mpr121_touchkey.c')
-rw-r--r--drivers/input/keyboard/mpr121_touchkey.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/input/keyboard/mpr121_touchkey.c b/drivers/input/keyboard/mpr121_touchkey.c
index 0a9e8119488..1c1615d9a7f 100644
--- a/drivers/input/keyboard/mpr121_touchkey.c
+++ b/drivers/input/keyboard/mpr121_touchkey.c
@@ -43,14 +43,15 @@
* enabled capacitance sensing inputs and its run/suspend mode.
*/
#define ELECTRODE_CONF_ADDR 0x5e
+#define ELECTRODE_CONF_QUICK_CHARGE 0x80
#define AUTO_CONFIG_CTRL_ADDR 0x7b
#define AUTO_CONFIG_USL_ADDR 0x7d
#define AUTO_CONFIG_LSL_ADDR 0x7e
#define AUTO_CONFIG_TL_ADDR 0x7f
/* Threshold of touch/release trigger */
-#define TOUCH_THRESHOLD 0x0f
-#define RELEASE_THRESHOLD 0x0a
+#define TOUCH_THRESHOLD 0x08
+#define RELEASE_THRESHOLD 0x05
/* Masks for touch and release triggers */
#define TOUCH_STATUS_MASK 0xfff
/* MPR121 has 12 keys */
@@ -127,7 +128,7 @@ static int __devinit mpr121_phys_init(const struct mpr121_platform_data *pdata,
struct i2c_client *client)
{
const struct mpr121_init_register *reg;
- unsigned char usl, lsl, tl;
+ unsigned char usl, lsl, tl, eleconf;
int i, t, vdd, ret;
/* Set up touch/release threshold for ele0-ele11 */
@@ -163,8 +164,15 @@ static int __devinit mpr121_phys_init(const struct mpr121_platform_data *pdata,
ret = i2c_smbus_write_byte_data(client, AUTO_CONFIG_USL_ADDR, usl);
ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_LSL_ADDR, lsl);
ret |= i2c_smbus_write_byte_data(client, AUTO_CONFIG_TL_ADDR, tl);
+
+ /*
+ * Quick charge bit will let the capacitive charge to ready
+ * state quickly, or the buttons may not function after system
+ * boot.
+ */
+ eleconf = mpr121->keycount | ELECTRODE_CONF_QUICK_CHARGE;
ret |= i2c_smbus_write_byte_data(client, ELECTRODE_CONF_ADDR,
- mpr121->keycount);
+ eleconf);
if (ret != 0)
goto err_i2c_write;