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| author | Luca Weiss <luca@z3ntu.xyz> | 2023-05-02 03:02:56 +0300 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2023-05-02 03:07:12 +0300 |
| commit | d09dbc7a018c4d479d7ab0d3b4f6a3211b110923 (patch) | |
| tree | d7be4a92554f7f6fa5a4e3d168cba17118d48ed6 /drivers/input | |
| parent | 980626ec1ca82a10dc04026a79dcbade23cc3438 (diff) | |
| download | linux-d09dbc7a018c4d479d7ab0d3b4f6a3211b110923.tar.xz | |
Input: drv260x - fix magnitude handling
First of all, previously the 16-bit magnitude was written as-is to the
device which actually discarded the upper 8 bits since the device has
8-bit registers only. This meant that a strong_magnitude of 0xFF00 would
result in 0. To correct this shift the strong_magnitude / weak_magnitude
input values so we discard the lower 8 bits and keep the upper bits
instead.
Secondly the RTP mode that is used by default interprets the values as
signed (2s complement), so 0x81 = 0%, 0x00 = 50%, 0x7F = 100%. This
doesn't match the FF_RUMBLE interface at all, so let's tell the device
to interpret the data as unsigned instead which gets us 0x00 = 0% and
0xFF = 100%.
As last change switch ERM to using "Closed-Loop Mode, Unidirectional"
instead of "Open-Loop Mode" since it's recommended by the datasheet
compared to open loop and better matches our use case of 0% - 100%
vibration.
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20230430-drv260x-improvements-v1-4-1fb28b4cc698@z3ntu.xyz
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/misc/drv260x.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/input/misc/drv260x.c b/drivers/input/misc/drv260x.c index a7e3120bdc13..f5e96b36acda 100644 --- a/drivers/input/misc/drv260x.c +++ b/drivers/input/misc/drv260x.c @@ -186,7 +186,7 @@ struct drv260x_data { struct work_struct work; struct gpio_desc *enable_gpio; struct regulator *regulator; - u32 magnitude; + u8 magnitude; u32 mode; u32 library; int rated_voltage; @@ -237,10 +237,11 @@ static int drv260x_haptics_play(struct input_dev *input, void *data, haptics->mode = DRV260X_LRA_NO_CAL_MODE; + /* Scale u16 magnitude into u8 register value */ if (effect->u.rumble.strong_magnitude > 0) - haptics->magnitude = effect->u.rumble.strong_magnitude; + haptics->magnitude = effect->u.rumble.strong_magnitude >> 8; else if (effect->u.rumble.weak_magnitude > 0) - haptics->magnitude = effect->u.rumble.weak_magnitude; + haptics->magnitude = effect->u.rumble.weak_magnitude >> 8; else haptics->magnitude = 0; @@ -266,7 +267,7 @@ static void drv260x_close(struct input_dev *input) static const struct reg_sequence drv260x_lra_cal_regs[] = { { DRV260X_MODE, DRV260X_AUTO_CAL }, - { DRV260X_CTRL3, DRV260X_NG_THRESH_2 }, + { DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_RTP_UNSIGNED_DATA }, { DRV260X_FEEDBACK_CTRL, DRV260X_FB_REG_LRA_MODE | DRV260X_BRAKE_FACTOR_4X | DRV260X_LOOP_GAIN_HIGH }, }; @@ -284,7 +285,7 @@ static const struct reg_sequence drv260x_lra_init_regs[] = { DRV260X_BEMF_GAIN_3 }, { DRV260X_CTRL1, DRV260X_STARTUP_BOOST }, { DRV260X_CTRL2, DRV260X_SAMP_TIME_250 }, - { DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_ANALOG_IN }, + { DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_RTP_UNSIGNED_DATA | DRV260X_ANALOG_IN }, { DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS }, }; @@ -299,7 +300,7 @@ static const struct reg_sequence drv260x_erm_cal_regs[] = { { DRV260X_CTRL1, DRV260X_STARTUP_BOOST }, { DRV260X_CTRL2, DRV260X_SAMP_TIME_250 | DRV260X_BLANK_TIME_75 | DRV260X_IDISS_TIME_75 }, - { DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_ERM_OPEN_LOOP }, + { DRV260X_CTRL3, DRV260X_NG_THRESH_2 | DRV260X_RTP_UNSIGNED_DATA }, { DRV260X_CTRL4, DRV260X_AUTOCAL_TIME_500MS }, }; |