On Jun 03 2016 or thereabouts, Andrew Duggan wrote:
> Implements reading and setting the dribble bit in F12's control registers.
>
> Signed-off-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
> ---
I haven't checked the spec and made sure we are not writing were we
should not, but I trust the tests.
Acked-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cheers,
Benjamin
> drivers/input/rmi4/rmi_f12.c | 74 +++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 73 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/input/rmi4/rmi_f12.c b/drivers/input/rmi4/rmi_f12.c
> index 8dd3fb5..041a91d 100644
> --- a/drivers/input/rmi4/rmi_f12.c
> +++ b/drivers/input/rmi4/rmi_f12.c
> @@ -30,6 +30,7 @@ struct f12_data {
> struct rmi_function *fn;
> struct rmi_2d_sensor sensor;
> struct rmi_2d_sensor_platform_data sensor_pdata;
> + bool has_dribble;
>
> u16 data_addr;
>
> @@ -228,12 +229,79 @@ static int rmi_f12_attention(struct rmi_function *fn,
> return 0;
> }
>
> +static int rmi_f12_write_control_regs(struct rmi_function *fn)
> +{
> + int ret;
> + const struct rmi_register_desc_item *item;
> + struct rmi_device *rmi_dev = fn->rmi_dev;
> + struct f12_data *f12 = dev_get_drvdata(&fn->dev);
> + int control_size;
> + char buf[3];
> + u16 control_offset = 0;
> + u8 subpacket_offset = 0;
> +
> + if (f12->has_dribble
> + && (f12->sensor.dribble != RMI_REG_STATE_DEFAULT)) {
> + item = rmi_get_register_desc_item(&f12->control_reg_desc, 20);
> + if (item) {
> + control_offset = rmi_register_desc_calc_reg_offset(
> + &f12->control_reg_desc, 20);
> +
> + /*
> + * The byte containing the EnableDribble bit will be
> + * in either byte 0 or byte 2 of control 20. Depending
> + * on the existence of subpacket 0. If control 20 is
> + * larger then 3 bytes, just read the first 3.
> + */
> + if (item->reg_size >= 3)
> + control_size = 3;
> + else
> + control_size = item->reg_size;
> +
> + ret = rmi_read_block(rmi_dev, fn->fd.control_base_addr
> + + control_offset, buf, control_size);
> + if (ret)
> + return ret;
> +
> + if (rmi_register_desc_has_subpacket(item, 0))
> + subpacket_offset += 1;
> +
> + switch (f12->sensor.dribble) {
> + case RMI_REG_STATE_OFF:
> + buf[subpacket_offset] &= ~BIT(2);
> + break;
> + case RMI_REG_STATE_ON:
> + buf[subpacket_offset] |= BIT(2);
> + break;
> + case RMI_REG_STATE_DEFAULT:
> + default:
> + break;
> + }
> +
> + ret = rmi_write_block(rmi_dev,
> + fn->fd.control_base_addr + control_offset,
> + buf, control_size);
> + if (ret)
> + return ret;
> + }
> + }
> +
> + return 0;
> +
> +}
> +
> static int rmi_f12_config(struct rmi_function *fn)
> {
> struct rmi_driver *drv = fn->rmi_dev->driver;
> + int ret;
>
> drv->set_irq_bits(fn->rmi_dev, fn->irq_mask);
>
> + ret = rmi_f12_write_control_regs(fn);
> + if (ret)
> + dev_warn(&fn->dev,
> + "Failed to write F12 control registers: %d\n", ret);
> +
> return 0;
> }
>
> @@ -260,16 +328,19 @@ static int rmi_f12_probe(struct rmi_function *fn)
> }
> ++query_addr;
>
> - if (!(buf & 0x1)) {
> + if (!(buf & BIT(0))) {
> dev_err(&fn->dev,
> "Behavior of F12 without register descriptors is undefined.\n");
> return -ENODEV;
> }
>
> +
> f12 = devm_kzalloc(&fn->dev, sizeof(struct f12_data), GFP_KERNEL);
> if (!f12)
> return -ENOMEM;
>
> + f12->has_dribble = !!(buf & BIT(3));
> +
> if (fn->dev.of_node) {
> ret = rmi_2d_sensor_of_probe(&fn->dev, &f12->sensor_pdata);
> if (ret)
> @@ -318,6 +389,7 @@ static int rmi_f12_probe(struct rmi_function *fn)
>
> sensor->x_mm = f12->sensor_pdata.x_mm;
> sensor->y_mm = f12->sensor_pdata.y_mm;
> + sensor->dribble = f12->sensor_pdata.dribble;
>
> if (sensor->sensor_type == rmi_sensor_default)
> sensor->sensor_type =
> --
> 2.5.0
>
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