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Date: Wed, 26 Mar 2014 12:55:21 -0400
From: Jon Ringle <jon@...gle.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-input@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc: Jon Ringle <jringle@...dpoint.com>
Subject: Re: [PATCH v3] touchscreen: tps6507x-ts: only poll while touch event
is occurring
I've not heard anything regarding this patch. I just want to make sure
it doesn't get lost :)
Jon
On Wed, Mar 5, 2014 at 3:09 AM, <jon@...gle.org> wrote:
> From: Jon Ringle <jringle@...dpoint.com>
>
> (Resending without corporate dislaimer in email footer)
>
> We only need to poll for touch events after an interrupt occurs due to the
> user touching the screen. We continue to poll until the user stops touching
> the screen
>
> Signed-off-by: Jon Ringle <jringle@...dpoint.com>
> ---
> drivers/input/touchscreen/tps6507x-ts.c | 189 +++++++++++++++++++++++++-------
> include/linux/input/tps6507x-ts.h | 1 +
> include/linux/mfd/tps6507x.h | 1 +
> 3 files changed, 151 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/input/touchscreen/tps6507x-ts.c b/drivers/input/touchscreen/tps6507x-ts.c
> index 94cde2c..c051419 100644
> --- a/drivers/input/touchscreen/tps6507x-ts.c
> +++ b/drivers/input/touchscreen/tps6507x-ts.c
> @@ -17,11 +17,14 @@
> #include <linux/workqueue.h>
> #include <linux/slab.h>
> #include <linux/input.h>
> -#include <linux/input-polldev.h>
> #include <linux/platform_device.h>
> #include <linux/mfd/tps6507x.h>
> #include <linux/input/tps6507x-ts.h>
> #include <linux/delay.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
>
> #define TSC_DEFAULT_POLL_PERIOD 30 /* ms */
> #define TPS_DEFAULT_MIN_PRESSURE 0x30
> @@ -39,13 +42,17 @@ struct ts_event {
> };
>
> struct tps6507x_ts {
> + struct input_dev *input_dev;
> struct device *dev;
> - struct input_polled_dev *poll_dev;
> struct tps6507x_dev *mfd;
> char phys[32];
> + struct delayed_work work;
> struct ts_event tc;
> + int irq;
> + unsigned long poll_period; /* ms */
> u16 min_pressure;
> bool pendown;
> + int open_count;
> };
>
> static int tps6507x_read_u8(struct tps6507x_ts *tsc, u8 reg, u8 *data)
> @@ -155,13 +162,20 @@ static s32 tps6507x_adc_standby(struct tps6507x_ts *tsc)
> return ret;
> }
>
> -static void tps6507x_ts_poll(struct input_polled_dev *poll_dev)
> +static void tps6507x_ts_handler(struct work_struct *work)
> {
> - struct tps6507x_ts *tsc = poll_dev->private;
> - struct input_dev *input_dev = poll_dev->input;
> + struct tps6507x_ts *tsc = container_of(work, struct tps6507x_ts, work.work);
> + struct input_dev *input_dev = tsc->input_dev;
> bool pendown;
> + int schd;
> + int poll = 0;
> s32 ret;
>
> + if (tsc->irq) {
> + // Disable the touch interrupt
> + tps6507x_write_u8(tsc, TPS6507X_REG_INT, 0);
> + }
> +
> ret = tps6507x_adc_conversion(tsc, TPS6507X_TSCMODE_PRESSURE,
> &tsc->tc.pressure);
> if (ret)
> @@ -178,10 +192,11 @@ static void tps6507x_ts_poll(struct input_polled_dev *poll_dev)
> }
>
> if (pendown) {
> + int report_pendown = 0;
>
> if (!tsc->pendown) {
> dev_dbg(tsc->dev, "DOWN\n");
> - input_report_key(input_dev, BTN_TOUCH, 1);
> + report_pendown = 1;
> } else
> dev_dbg(tsc->dev, "still down\n");
>
> @@ -195,15 +210,86 @@ static void tps6507x_ts_poll(struct input_polled_dev *poll_dev)
> if (ret)
> goto done;
>
> - input_report_abs(input_dev, ABS_X, tsc->tc.x);
> - input_report_abs(input_dev, ABS_Y, tsc->tc.y);
> - input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure);
> - input_sync(input_dev);
> - tsc->pendown = true;
> + if (tsc->tc.x && tsc->tc.y) {
> + if (report_pendown)
> + input_report_key(input_dev, BTN_TOUCH, 1);
> +
> + input_report_abs(input_dev, ABS_X, tsc->tc.x);
> + input_report_abs(input_dev, ABS_Y, tsc->tc.y);
> + input_report_abs(input_dev, ABS_PRESSURE, tsc->tc.pressure);
> + input_sync(input_dev);
> + tsc->pendown = true;
> + } else {
> + dev_dbg(tsc->dev, "discarding bogus read x=%d, y=%d, pressure=%d\n", tsc->tc.x, tsc->tc.y, tsc->tc.pressure);
> + }
> + poll = 1;
> }
>
> done:
> tps6507x_adc_standby(tsc);
> + if (tsc->irq && !poll) {
> + // Re-enable the interrupt
> + tps6507x_write_u8(tsc, TPS6507X_REG_INT, TPS6507X_REG_MASK_TSC);
> + } else {
> + /* always poll if not using interrupts */
> + schd = schedule_delayed_work(&tsc->work,
> + msecs_to_jiffies(tsc->poll_period));
> + }
> +}
> +
> +static irqreturn_t tps6507x_ts_irq(int irq, void * dev_id)
> +{
> + struct tps6507x_ts * tsc = (struct tps6507x_ts *)dev_id;
> +
> + schedule_delayed_work(&tsc->work, 0);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int tps6507x_ts_open(struct input_dev *input_dev)
> +{
> + int ret;
> + struct tps6507x_ts *tsc = input_get_drvdata(input_dev);
> +
> + tsc->open_count++;
> +
> + if (tsc->irq) {
> +
> + tps6507x_write_u8(tsc, TPS6507X_REG_INT, 0);
> + tps6507x_adc_standby(tsc);
> +
> + ret = request_irq(tsc->irq,tps6507x_ts_irq, 0, "TPS6507x",tsc);
> +
> + if(ret < 0) {
> + tsc->open_count--;
> + dev_err(tsc->dev, "cannot register irq");
> + return ret;
> + }
> + // Enable the touch event interrupt
> + tps6507x_write_u8(tsc, TPS6507X_REG_INT, TPS6507X_REG_MASK_TSC);
> + } else {
> + ret = schedule_delayed_work(&tsc->work,
> + msecs_to_jiffies(tsc->poll_period));
> +
> + if (!ret) {
> + tsc->open_count--;
> + dev_err(tsc->dev, "schedule failed");
> + return -ENOMEM;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static void tps6507x_ts_close(struct input_dev *input_dev)
> +{
> + struct tps6507x_ts *tsc = input_get_drvdata(input_dev);
> +
> + tsc->open_count--;
> +
> + if(tsc->irq) {
> + free_irq(tsc->irq,tsc);
> + }
> }
>
> static int tps6507x_ts_probe(struct platform_device *pdev)
> @@ -212,8 +298,8 @@ static int tps6507x_ts_probe(struct platform_device *pdev)
> const struct tps6507x_board *tps_board;
> const struct touchscreen_init_data *init_data;
> struct tps6507x_ts *tsc;
> - struct input_polled_dev *poll_dev;
> struct input_dev *input_dev;
> + int schd;
> int error;
>
> /*
> @@ -239,29 +325,18 @@ static int tps6507x_ts_probe(struct platform_device *pdev)
> return -ENOMEM;
> }
>
> + tps6507x_dev->ts = tsc;
> tsc->mfd = tps6507x_dev;
> tsc->dev = tps6507x_dev->dev;
> - tsc->min_pressure = init_data ?
> - init_data->min_pressure : TPS_DEFAULT_MIN_PRESSURE;
> -
> - snprintf(tsc->phys, sizeof(tsc->phys),
> - "%s/input0", dev_name(tsc->dev));
> -
> - poll_dev = input_allocate_polled_device();
> - if (!poll_dev) {
> - dev_err(tsc->dev, "Failed to allocate polled input device.\n");
> + input_dev = input_allocate_device();
> + if (!input_dev) {
> + dev_err(tsc->dev, "Failed to allocate input device.\n");
> error = -ENOMEM;
> goto err_free_mem;
> }
>
> - tsc->poll_dev = poll_dev;
> -
> - poll_dev->private = tsc;
> - poll_dev->poll = tps6507x_ts_poll;
> - poll_dev->poll_interval = init_data ?
> - init_data->poll_period : TSC_DEFAULT_POLL_PERIOD;
> -
> - input_dev = poll_dev->input;
> + input_dev->open = tps6507x_ts_open;
> + input_dev->close = tps6507x_ts_close;
> input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
> input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
>
> @@ -270,42 +345,76 @@ static int tps6507x_ts_probe(struct platform_device *pdev)
> input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_10BIT, 0, 0);
>
> input_dev->name = "TPS6507x Touchscreen";
> - input_dev->phys = tsc->phys;
> - input_dev->dev.parent = tsc->dev;
> input_dev->id.bustype = BUS_I2C;
> + input_dev->dev.parent = tsc->dev;
> +
> + snprintf(tsc->phys, sizeof(tsc->phys),
> + "%s/input0", dev_name(tsc->dev));
> + input_dev->phys = tsc->phys;
> +
> + dev_dbg(tsc->dev, "device: %s\n", input_dev->phys);
> +
> + input_set_drvdata(input_dev, tsc);
> +
> + tsc->input_dev = input_dev;
> +
> + INIT_DELAYED_WORK(&tsc->work, tps6507x_ts_handler);
> if (init_data) {
> + tsc->poll_period = init_data->poll_period;
> + tsc->irq = gpio_to_irq(init_data->irq_pin);
> + tsc->min_pressure = init_data->min_pressure;
> input_dev->id.vendor = init_data->vendor;
> input_dev->id.product = init_data->product;
> input_dev->id.version = init_data->version;
> + } else {
> + tsc->poll_period = TSC_DEFAULT_POLL_PERIOD;
> + tsc->min_pressure = TPS_DEFAULT_MIN_PRESSURE;
> }
>
> error = tps6507x_adc_standby(tsc);
> if (error)
> - goto err_free_polled_dev;
> + goto err_free_dev;
>
> - error = input_register_polled_device(poll_dev);
> + error = input_register_device(input_dev);
> if (error)
> - goto err_free_polled_dev;
> + goto err_free_dev;
> +
> + if (!tsc->irq) {
> + schd = schedule_delayed_work(&tsc->work,
> + msecs_to_jiffies(tsc->poll_period));
> +
> + if (!schd) {
> + dev_err(tsc->dev, "schedule failed");
> + goto err_cancel_work;
> + }
> + }
>
> platform_set_drvdata(pdev, tsc);
>
> return 0;
>
> -err_free_polled_dev:
> - input_free_polled_device(poll_dev);
> +err_cancel_work:
> + cancel_delayed_work_sync(&tsc->work);
> +err_free_dev:
> + input_free_device(input_dev);
> err_free_mem:
> kfree(tsc);
> + tps6507x_dev->ts = NULL;
> +
> return error;
> }
>
> static int tps6507x_ts_remove(struct platform_device *pdev)
> {
> - struct tps6507x_ts *tsc = platform_get_drvdata(pdev);
> - struct input_polled_dev *poll_dev = tsc->poll_dev;
> + struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
> + struct tps6507x_ts *tsc = tps6507x_dev->ts;
> + struct input_dev *input_dev = tsc->input_dev;
> +
> + cancel_delayed_work_sync(&tsc->work);
>
> - input_unregister_polled_device(poll_dev);
> - input_free_polled_device(poll_dev);
> + input_unregister_device(input_dev);
>
> + tps6507x_dev->ts = NULL;
> kfree(tsc);
>
> return 0;
> diff --git a/include/linux/input/tps6507x-ts.h b/include/linux/input/tps6507x-ts.h
> index b433df8..3c5aa7b 100644
> --- a/include/linux/input/tps6507x-ts.h
> +++ b/include/linux/input/tps6507x-ts.h
> @@ -14,6 +14,7 @@
> /* Board specific touch screen initial values */
> struct touchscreen_init_data {
> int poll_period; /* ms */
> + int irq_pin;
> __u16 min_pressure; /* min reading to be treated as a touch */
> __u16 vendor;
> __u16 product;
> diff --git a/include/linux/mfd/tps6507x.h b/include/linux/mfd/tps6507x.h
> index c2ae569..c923e486 100644
> --- a/include/linux/mfd/tps6507x.h
> +++ b/include/linux/mfd/tps6507x.h
> @@ -163,6 +163,7 @@ struct tps6507x_dev {
>
> /* Client devices */
> struct tps6507x_pmic *pmic;
> + struct tps6507x_ts *ts;
> };
>
> #endif /* __LINUX_MFD_TPS6507X_H */
> --
> 1.8.5.4
>
--
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