On Mon, Nov 16, 2015 at 09:39:06AM -0600, Rob Herring wrote:
> On Sun, Nov 15, 2015 at 04:56:43PM +0100, Sander Vermin wrote:
> > This patch improves the pixcir_i2c_ts touchscreen controller which is used by the POV PROTAB2 tablet.
> >
> > On POV PROTAB2 tablet the WAKE and ENABLE gpios are used, and the screen is rotated, so touchscreen-inverted-x and touchscreen-inverted-y are needed.
> >
> > In this patch the WAKE and ENABLE gpios are implemented and furtermore the touchscreen-inverted-x/y and touchscreen-swapped-x-y devicetree options are implemented.
>
> Need to fix the line wrapping.
Please split up the gpio handling form coordinate conversion.
>
> >
> > Signed-off-by: Sander Vermin <sander@xxxxxxxxx>
> > ---
> > .../bindings/input/touchscreen/pixcir_i2c_ts.txt | 24 ++--
> > drivers/input/touchscreen/pixcir_i2c_ts.c | 125 +++++++++++++++++++--
> > 2 files changed, 135 insertions(+), 14 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> > index 8eb240a..5f25e96 100644
> > --- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> > +++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
> > @@ -1,15 +1,25 @@
> > * Pixcir I2C touchscreen controllers
> >
> > Required properties:
> > -- compatible: must be "pixcir,pixcir_ts" or "pixcir,pixcir_tangoc"
> > -- reg: I2C address of the chip
> > -- interrupts: interrupt to which the chip is connected
> > -- attb-gpio: GPIO connected to the ATTB line of the chip
> > -- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
> > -- touchscreen-size-y: vertical resolution of touchscreen (in pixels)
> > +- compatible : must be "pixcir,pixcir_ts" or "pixcir,pixcir_tangoc"
> > +- reg : I2C address of the chip
> > +- interrupts : interrupt to which the chip is connected
> > +- attb-gpio : GPIO connected to the ATTB line of the chip
> > +- touchscreen-size-x : horizontal resolution of touchscreen (in pixels)
> > +- touchscreen-size-y : vertical resolution of touchscreen (in pixels)
>
> Please do reformatting in a separate patch.
>
> > Optional properties:
> > -- reset-gpio: GPIO connected to the RESET line of the chip
> > +- reset-gpio : GPIO connected to the RESET line of the chip
> > +- enable-gpios : GPIO connected to the ENABLE line of the chip
> > +- wake-gpios : GPIO connected to the WAKE line of the chip
> > +- touchscreen-fuzz-x : horizontal noise value of the absolute input
> > + device (in pixels)
> > +- touchscreen-fuzz-y : vertical noise value of the absolute input
> > + device (in pixels)
> > +- touchscreen-inverted-x: X axis is inverted (boolean)
> > +- touchscreen-inverted-y: Y axis is inverted (boolean)
> > +- touchscreen-swapped-x-y : X and Y axis are swapped (boolean)
> > + Swapping is done after inverting the axis
>
> Adding these touchscreen properties are not mentioned in the subject.
>
> >
> > Example:
> >
> > diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> > index 4b961ad..87f86b5 100644
> > --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> > +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> > @@ -38,6 +38,13 @@ struct pixcir_i2c_ts_data {
> > struct input_dev *input;
> > struct gpio_desc *gpio_attb;
> > struct gpio_desc *gpio_reset;
> > + struct gpio_desc *gpio_enable;
> > + struct gpio_desc *gpio_wake;
> > + u32 max_x;
> > + u32 max_y;
> > + bool invert_x;
> > + bool invert_y;
> > + bool swap_x_y;
> > const struct pixcir_i2c_chip_data *chip;
> > int max_fingers; /* Max fingers supported in this instance */
> > bool running;
> > @@ -146,12 +153,27 @@ static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
> > slot = slots[i];
> > }
> >
> > + if (ts->invert_x)
> > + touch->x = ts->max_x - touch->x;
> > +
> > + if (ts->invert_y)
> > + touch->y = ts->max_y - touch->y;
> > +
> > 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);
> > + if (!ts->swap_x_y) {
> > + input_event(ts->input, EV_ABS, ABS_MT_POSITION_X,
> > + touch->x);
> > + input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y,
> > + touch->y);
> > + } else {
> > + input_event(ts->input, EV_ABS, ABS_MT_POSITION_X,
> > + touch->y);
> > + input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y,
> > + touch->x);
> > + }
> >
> > dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
> > i, slot, touch->x, touch->y);
> > @@ -194,6 +216,7 @@ static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
> > static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
> > {
> > if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
> > + /* toggle reset pin */
> > gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
> > ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
> > gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
> > @@ -208,6 +231,14 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
> > struct device *dev = &ts->client->dev;
> > int ret;
> >
> > + if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) {
> > + if (!IS_ERR_OR_NULL(ts->gpio_wake)) {
> > + /* set wake pin */
> > + gpiod_set_value_cansleep(ts->gpio_wake, 1);
> > + dev_info(dev, "SET POWER: Set wake pin HIGH\n");
> > + }
> > + }
> > +
> > ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
> > if (ret < 0) {
> > dev_err(dev, "%s: can't read reg 0x%x : %d\n",
> > @@ -228,6 +259,14 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
> > return ret;
> > }
> >
> > + if (mode == PIXCIR_POWER_HALT) {
> > + if (!IS_ERR_OR_NULL(ts->gpio_wake)) {
> > + /* set wake pin */
> > + gpiod_set_value_cansleep(ts->gpio_wake, 0);
> > + dev_info(dev, "SET POWER: Set wake pin LOW\n");
> > + }
> > + }
> > +
> > return 0;
> > }
> >
> > @@ -302,6 +341,14 @@ static int pixcir_start(struct pixcir_i2c_ts_data *ts)
> > struct device *dev = &ts->client->dev;
> > int error;
> >
> > + if (!IS_ERR_OR_NULL(ts->gpio_enable)) {
> > + /* set enable pin */
> > + gpiod_set_value_cansleep(ts->gpio_enable, 1);
> > + dev_info(dev, "START: Set enable pin HIGH\n");
> > + }
> > +
> > + msleep(100);
> > +
> > /* LEVEL_TOUCH interrupt with active low polarity */
> > error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
> > if (error) {
> > @@ -325,6 +372,7 @@ static int pixcir_start(struct pixcir_i2c_ts_data *ts)
> >
> > static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
> > {
> > + struct device *dev = &ts->client->dev;
> > int error;
> >
> > /* Disable interrupt generation */
> > @@ -343,6 +391,12 @@ static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
> > /* Wait till running ISR is complete */
> > synchronize_irq(ts->client->irq);
> >
> > + if (!IS_ERR_OR_NULL(ts->gpio_enable)) {
> > + /* set enable pin */
> > + gpiod_set_value_cansleep(ts->gpio_enable, 0);
> > + dev_info(dev, "STOP: Set enable pin LOW\n");
> > + }
> > +
> > return 0;
> > }
> >
> > @@ -425,6 +479,7 @@ static int pixcir_parse_dt(struct device *dev,
> > struct pixcir_i2c_ts_data *tsdata)
> > {
> > const struct of_device_id *match;
> > + struct device_node *np = dev->of_node;
> >
> > match = of_match_device(of_match_ptr(pixcir_of_match), dev);
> > if (!match)
> > @@ -433,7 +488,12 @@ static int pixcir_parse_dt(struct device *dev,
> > tsdata->chip = (const struct pixcir_i2c_chip_data *)match->data;
> > if (!tsdata->chip)
> > return -EINVAL;
> > -
> > +
> > + /* Optional device tree properties */
> > + tsdata->swap_x_y = of_property_read_bool(np, "touchscreen-swapped-x-y");
> > + tsdata->invert_x = of_property_read_bool(np, "touchscreen-inverted-x");
> > + tsdata->invert_y = of_property_read_bool(np, "touchscreen-inverted-y");
> > +
> > return 0;
> > }
> > #else
> > @@ -490,19 +550,37 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
> > input->dev.parent = &client->dev;
> >
> > if (pdata) {
> > - 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);
> > + if (!tsdata->swap_x_y) {
> > + 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);
> > + } else {
> > + input_set_abs_params(input, ABS_MT_POSITION_X, 0,
> > + pdata->y_max, 0, 0);
> > + input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
> > + pdata->x_max, 0, 0);
> > + }
> > } else {
> > input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
> > input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
> > touchscreen_parse_properties(input, true);
> > - if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
> > - !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
> > + tsdata->max_x = input_abs_get_max(input, ABS_MT_POSITION_X);
> > + tsdata->max_y = input_abs_get_max(input, ABS_MT_POSITION_Y);
> > + if (!tsdata->max_x || !tsdata->max_y) {
> > dev_err(dev, "Touchscreen size is not specified\n");
> > return -EINVAL;
> > }
> > + if (tsdata->swap_x_y) {
> > + input_set_abs_params(input, ABS_MT_POSITION_X, 0,
> > + tsdata->max_y, 0, 0);
> > + input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
> > + tsdata->max_x, 0, 0);
> > + }
> > }
> >
> > +
> > +
> > tsdata->max_fingers = tsdata->chip->max_fingers;
> > if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
> > tsdata->max_fingers = PIXCIR_MAX_SLOTS;
> > @@ -534,6 +612,24 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
> > return error;
> > }
> >
> > + tsdata->gpio_wake = devm_gpiod_get(dev, "wake",
> > + GPIOD_OUT_HIGH);
> > + if (IS_ERR(tsdata->gpio_wake)) {
> > + error = PTR_ERR(tsdata->gpio_wake);
> > + if (error != -EPROBE_DEFER)
> > + dev_err(dev, "Failed to request wake gpio: %d\n", error);
> > + return error;
> > + }
> > +
> > + tsdata->gpio_enable = devm_gpiod_get(dev, "enable",
> > + GPIOD_OUT_HIGH);
> > + if (IS_ERR(tsdata->gpio_enable)) {
> > + error = PTR_ERR(tsdata->gpio_enable);
> > + if (error != -EPROBE_DEFER)
> > + dev_err(dev, "Failed to request enable gpio: %d\n", error);
> > + return error;
> > + }
> > +
> > error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
> > IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> > client->name, tsdata);
> > @@ -542,6 +638,21 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
> > return error;
> > }
> >
> > +
> > + if (!IS_ERR_OR_NULL(tsdata->gpio_enable)) {
> > + /* set enable pin */
> > + gpiod_set_value_cansleep(tsdata->gpio_enable, 1);
> > + dev_info(dev, "PROBE: Set enable pin HIGH\n");
> > + }
> > +
> > + if (!IS_ERR_OR_NULL(tsdata->gpio_wake)) {
> > + /* set wake pin */
> > + gpiod_set_value_cansleep(tsdata->gpio_wake, 1);
> > + dev_info(dev, "PROBE: Set wake pin HIGH\n");
> > + }
You requested them active, why do you need to set them again to active
here?
> > +
> > + msleep(100);
> > +
> > pixcir_reset(tsdata);
> >
> > /* Always be in IDLE mode to save power, device supports auto wake */
> > --
> > 2.5.0
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
--
Dmitry
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