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input: twl4030: Keypad scan and input 

This allows scanning the twl4030 keypad, storing the result in a 64-byte long
matrix with the twl4030_keypad_scan function.

Detecting a key at a given column and row is made easier with the
twl4030_keypad_key function.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-by: Tom Rini <trini@konsulko.com>
utp
Paul Kocialkowski 2015-07-20 15:17:09 +02:00 committed by Tom Rini
parent 7d5ac91832
commit a4c8bbbc28
2 changed files with 42 additions and 0 deletions
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39
drivers/input/twl4030.c
View File

@ -47,3 +47,42 @@ int twl4030_input_usb(void)
return 0;
}
int twl4030_keypad_scan(unsigned char *matrix)
{
u8 data;
u8 c, r;
twl4030_i2c_read_u8(TWL4030_CHIP_KEYPAD,
TWL4030_KEYPAD_KEYP_CTRL_REG, &data);
data |= TWL4030_KEYPAD_CTRL_SOFT_NRST | TWL4030_KEYPAD_CTRL_KBD_ON;
data &= ~TWL4030_KEYPAD_CTRL_SOFTMODEN;
twl4030_i2c_write_u8(TWL4030_CHIP_KEYPAD,
TWL4030_KEYPAD_KEYP_CTRL_REG, data);
for (c = 0; c < 8; c++) {
data = 0xff & ~(1 << c);
twl4030_i2c_write_u8(TWL4030_CHIP_KEYPAD,
TWL4030_KEYPAD_KBC_REG, data);
data = 0xff;
twl4030_i2c_read_u8(TWL4030_CHIP_KEYPAD,
TWL4030_KEYPAD_KBR_REG, &data);
for (r = 0; r < 8; r++)
matrix[c * 8 + r] = !(data & (1 << r));
}
data = 0xff & ~(TWL4030_KEYPAD_CTRL_SOFT_NRST);
twl4030_i2c_write_u8(TWL4030_CHIP_KEYPAD,
TWL4030_KEYPAD_KEYP_CTRL_REG, data);
return 0;
}
int twl4030_keypad_key(unsigned char *matrix, u8 c, u8 r)
{
return matrix[c * 8 + r];
}

3
include/twl4030.h
View File

@ -683,6 +683,9 @@ int twl4030_input_power_button(void);
int twl4030_input_charger(void);
int twl4030_input_usb(void);
int twl4030_keypad_scan(unsigned char *matrix);
int twl4030_keypad_key(unsigned char *matrix, u8 c, u8 r);
/*
* LED
*/