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Message-ID: <5379ACF1.6080305@euromail.se>
Date: Mon, 19 May 2014 09:04:17 +0200
From: Henrik Rydberg <rydberg@...omail.se>
To: Roger Quadros <rogerq@...com>, dmitry.torokhov@...il.com
CC: balbi@...com, dmurphy@...com, mugunthanvnm@...com, nsekhar@...com,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v5 4/7] Input: pixcir_i2c_ts: Use Type-B Multi-Touch protocol
Hi Roger,
Thanks for the patch series. I think the patch looks great in general. Please
see some minor comments below.
On 05/06/2014 01:06 PM, Roger Quadros wrote:
> Switch to using the Type-B Multi-Touch protocol.
>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
> drivers/input/touchscreen/pixcir_i2c_ts.c | 125 ++++++++++++++++++++++--------
> 1 file changed, 94 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 8a7da61..1b6e4e5 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -23,9 +23,12 @@
> #include <linux/slab.h>
> #include <linux/i2c.h>
> #include <linux/input.h>
> +#include <linux/input/mt.h>
> #include <linux/input/pixcir_ts.h>
> #include <linux/gpio.h>
>
> +#define PIXCIR_MAX_SLOTS 2
> +
> struct pixcir_i2c_ts_data {
> struct i2c_client *client;
> struct input_dev *input;
> @@ -33,12 +36,25 @@ struct pixcir_i2c_ts_data {
> bool running;
> };
>
> -static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
> +struct pixcir_touch {
> + int x;
> + int y;
> +};
> +
> +struct pixcir_report_data {
> + int num_touches;
> + struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
> +};
> +
> +static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
> + struct pixcir_report_data *report)
> {
> - struct pixcir_i2c_ts_data *tsdata = data;
> u8 rdbuf[10], wrbuf[1] = { 0 };
> + u8 *bufptr;
> u8 touch;
> - int ret;
> + int ret, i;
> +
> + memset(report, 0, sizeof(struct pixcir_report_data));
>
> ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
> if (ret != sizeof(wrbuf)) {
> @@ -56,45 +72,85 @@ static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
> return;
> }
>
> - touch = rdbuf[0];
> - if (touch) {
> - u16 posx1 = (rdbuf[3] << 8) | rdbuf[2];
> - u16 posy1 = (rdbuf[5] << 8) | rdbuf[4];
> - u16 posx2 = (rdbuf[7] << 8) | rdbuf[6];
> - u16 posy2 = (rdbuf[9] << 8) | rdbuf[8];
> -
> - input_report_key(tsdata->input, BTN_TOUCH, 1);
> - input_report_abs(tsdata->input, ABS_X, posx1);
> - input_report_abs(tsdata->input, ABS_Y, posy1);
> -
> - input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
> - input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
> - input_mt_sync(tsdata->input);
> -
> - if (touch == 2) {
> - input_report_abs(tsdata->input,
> - ABS_MT_POSITION_X, posx2);
> - input_report_abs(tsdata->input,
> - ABS_MT_POSITION_Y, posy2);
> - input_mt_sync(tsdata->input);
> - }
> - } else {
> - input_report_key(tsdata->input, BTN_TOUCH, 0);
> + touch = rdbuf[0] & 0x7;
> + if (touch > PIXCIR_MAX_SLOTS)
> + touch = PIXCIR_MAX_SLOTS;
> +
> + report->num_touches = touch;
> + bufptr = &rdbuf[2];
> +
> + for (i = 0; i < touch; i++) {
> + report->touches[i].x = (bufptr[1] << 8) | bufptr[0];
> + report->touches[i].y = (bufptr[3] << 8) | bufptr[2];
> +
> + bufptr = &bufptr[4];
> }
> +}
In many places, the '&ptr[index]' form makes a lot of sense, but here, it would
have been clearer to use 'bufptr += 4'.
> +
> +static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
> + struct pixcir_report_data *report)
> +{
> + struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
> + int slots[PIXCIR_MAX_SLOTS];
> + struct pixcir_touch *touch;
> + int n, i, slot;
> + struct device *dev = &ts->client->dev;
>
> - input_sync(tsdata->input);
> + n = report->num_touches;
> + if (n > PIXCIR_MAX_SLOTS)
> + n = PIXCIR_MAX_SLOTS;
> +
> + for (i = 0; i < n; i++) {
> + touch = &report->touches[i];
> + pos[i].x = touch->x;
> + pos[i].y = touch->y;
> + }
> +
> + input_mt_assign_slots(ts->input, slots, pos, n);
> +
> + for (i = 0; i < n; i++) {
> + touch = &report->touches[i];
> + slot = slots[i];
> +
> + input_mt_slot(ts->input, slot);
> + input_mt_report_slot_state(ts->input,
> + MT_TOOL_FINGER, true);
> +
> + input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
> + input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
> +
> + dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
> + i, slot, touch->x, touch->y);
> + }
> +
> + input_mt_sync_frame(ts->input);
> + input_sync(ts->input);
> }
>
> static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
> {
> struct pixcir_i2c_ts_data *tsdata = dev_id;
> const struct pixcir_ts_platform_data *pdata = tsdata->chip;
> + struct pixcir_report_data report;
>
> while (tsdata->running) {
> - pixcir_ts_poscheck(tsdata);
> -
> - if (gpio_get_value(pdata->gpio_attb))
> + /* parse packet */
> + pixcir_ts_parse(tsdata, &report);
> +
> + /* report it */
> + pixcir_ts_report(tsdata, &report);
> +
> + if (gpio_get_value(pdata->gpio_attb)) {
> + if (report.num_touches) {
> + /*
> + * Last report with no finger up?
> + * Do it now then.
> + */
> + input_mt_sync_frame(tsdata->input);
> + input_sync(tsdata->input);
I think this construct is alright for this particular patch. If anything, it
points at a need for a better model of interrupted contacts in the core.
> + }
> break;
> + }
>
> msleep(20);
> }
> @@ -333,6 +389,13 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
> input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
> input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
>
> + error = input_mt_init_slots(input, PIXCIR_MAX_SLOTS,
> + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
> + if (error) {
> + dev_err(dev, "Error initializing Multi-Touch slots\n");
> + return error;
> + }
> +
> input_set_drvdata(input, tsdata);
>
> error = devm_gpio_request_one(dev, pdata->gpio_attb,
>
Reviewed-by: Henrik Rydberg <rydberg@...omail.se>
Thanks,
Henrik
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