forked from Minki/linux
Input: tsc2005 - add DT support
This adds DT support to the tsc2005 touchscreen driver. It also adds regulator support to the driver if booted via DT. Reviewed-by: Pavel Machek <pavel@ucw.cz> Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Sebastian Reichel <sre@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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@ -0,0 +1,42 @@
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* Texas Instruments tsc2005 touchscreen controller
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Required properties:
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- compatible : "ti,tsc2005"
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- reg : SPI device address
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- spi-max-frequency : Maximal SPI speed
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- interrupts : IRQ specifier
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- reset-gpios : GPIO specifier
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- vio-supply : Regulator specifier
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Optional properties:
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- ti,x-plate-ohms : integer, resistance of the touchscreen's X plates
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in ohm (defaults to 280)
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- ti,esd-recovery-timeout-ms : integer, if the touchscreen does not respond after
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the configured time (in milli seconds), the driver
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will reset it. This is disabled by default.
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- properties defined in touchscreen.txt
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Example:
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&mcspi1 {
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tsc2005@0 {
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compatible = "ti,tsc2005";
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spi-max-frequency = <6000000>;
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reg = <0>;
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vio-supply = <&vio>;
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reset-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>; /* 104 */
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interrupts-extended = <&gpio4 4 IRQ_TYPE_EDGE_RISING>; /* 100 */
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touchscreen-fuzz-x = <4>;
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touchscreen-fuzz-y = <7>;
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touchscreen-fuzz-pressure = <2>;
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touchscreen-max-x = <4096>;
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touchscreen-max-y = <4096>;
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touchscreen-max-pressure = <2048>;
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ti,x-plate-ohms = <280>;
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ti,esd-recovery-timeout-ms = <8000>;
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};
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}
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@ -25,11 +25,15 @@
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/tsc2005.h>
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#include <linux/regulator/consumer.h>
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/*
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* The touchscreen interface operates as follows:
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@ -100,6 +104,11 @@
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TSC2005_CFR2_AVG_7)
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#define MAX_12BIT 0xfff
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#define TSC2005_DEF_X_FUZZ 4
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#define TSC2005_DEF_Y_FUZZ 8
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#define TSC2005_DEF_P_FUZZ 2
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#define TSC2005_DEF_RESISTOR 280
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#define TSC2005_SPI_MAX_SPEED_HZ 10000000
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#define TSC2005_PENUP_TIME_MS 40
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@ -143,6 +152,9 @@ struct tsc2005 {
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bool pen_down;
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struct regulator *vio;
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int reset_gpio;
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void (*set_reset)(bool enable);
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};
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@ -337,6 +349,14 @@ static void tsc2005_stop_scan(struct tsc2005 *ts)
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tsc2005_cmd(ts, TSC2005_CMD_STOP);
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}
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static void tsc2005_set_reset(struct tsc2005 *ts, bool enable)
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{
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if (ts->reset_gpio >= 0)
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gpio_set_value(ts->reset_gpio, enable);
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else if (ts->set_reset)
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ts->set_reset(enable);
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}
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/* must be called with ts->mutex held */
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static void __tsc2005_disable(struct tsc2005 *ts)
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{
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@ -355,7 +375,7 @@ static void __tsc2005_enable(struct tsc2005 *ts)
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{
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tsc2005_start_scan(ts);
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if (ts->esd_timeout && ts->set_reset) {
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if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) {
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ts->last_valid_interrupt = jiffies;
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schedule_delayed_work(&ts->esd_work,
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round_jiffies_relative(
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@ -414,9 +434,9 @@ static ssize_t tsc2005_selftest_show(struct device *dev,
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}
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/* hardware reset */
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ts->set_reset(false);
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tsc2005_set_reset(ts, false);
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usleep_range(100, 500); /* only 10us required */
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ts->set_reset(true);
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tsc2005_set_reset(ts, true);
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if (!success)
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goto out;
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@ -459,7 +479,7 @@ static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
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umode_t mode = attr->mode;
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if (attr == &dev_attr_selftest.attr) {
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if (!ts->set_reset)
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if (!ts->set_reset && !ts->reset_gpio)
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mode = 0;
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}
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@ -509,9 +529,9 @@ static void tsc2005_esd_work(struct work_struct *work)
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tsc2005_update_pen_state(ts, 0, 0, 0);
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ts->set_reset(false);
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tsc2005_set_reset(ts, false);
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usleep_range(100, 500); /* only 10us required */
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ts->set_reset(true);
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tsc2005_set_reset(ts, true);
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enable_irq(ts->spi->irq);
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tsc2005_start_scan(ts);
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@ -572,29 +592,47 @@ static void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
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static int tsc2005_probe(struct spi_device *spi)
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{
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const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
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struct device_node *np = spi->dev.of_node;
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struct tsc2005 *ts;
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struct input_dev *input_dev;
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unsigned int max_x, max_y, max_p;
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unsigned int fudge_x, fudge_y, fudge_p;
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unsigned int max_x = MAX_12BIT;
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unsigned int max_y = MAX_12BIT;
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unsigned int max_p = MAX_12BIT;
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unsigned int fudge_x = TSC2005_DEF_X_FUZZ;
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unsigned int fudge_y = TSC2005_DEF_Y_FUZZ;
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unsigned int fudge_p = TSC2005_DEF_P_FUZZ;
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unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR;
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unsigned int esd_timeout;
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int error;
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if (!pdata) {
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if (!np && !pdata) {
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dev_err(&spi->dev, "no platform data\n");
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return -ENODEV;
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}
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fudge_x = pdata->ts_x_fudge ? : 4;
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fudge_y = pdata->ts_y_fudge ? : 8;
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fudge_p = pdata->ts_pressure_fudge ? : 2;
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max_x = pdata->ts_x_max ? : MAX_12BIT;
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max_y = pdata->ts_y_max ? : MAX_12BIT;
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max_p = pdata->ts_pressure_max ? : MAX_12BIT;
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if (spi->irq <= 0) {
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dev_err(&spi->dev, "no irq\n");
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return -ENODEV;
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}
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if (pdata) {
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fudge_x = pdata->ts_x_fudge;
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fudge_y = pdata->ts_y_fudge;
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fudge_p = pdata->ts_pressure_fudge;
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max_x = pdata->ts_x_max;
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max_y = pdata->ts_y_max;
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max_p = pdata->ts_pressure_max;
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x_plate_ohm = pdata->ts_x_plate_ohm;
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esd_timeout = pdata->esd_timeout_ms;
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} else {
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x_plate_ohm = TSC2005_DEF_RESISTOR;
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of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm);
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esd_timeout = 0;
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of_property_read_u32(np, "ti,esd-recovery-timeout-ms",
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&esd_timeout);
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}
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spi->mode = SPI_MODE_0;
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spi->bits_per_word = 8;
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if (!spi->max_speed_hz)
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@ -615,9 +653,37 @@ static int tsc2005_probe(struct spi_device *spi)
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ts->spi = spi;
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ts->idev = input_dev;
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ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
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ts->esd_timeout = pdata->esd_timeout_ms;
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ts->set_reset = pdata->set_reset;
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ts->x_plate_ohm = x_plate_ohm;
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ts->esd_timeout = esd_timeout;
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if (np) {
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ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
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if (ts->reset_gpio == -EPROBE_DEFER)
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return ts->reset_gpio;
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if (ts->reset_gpio < 0) {
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dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
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ts->reset_gpio);
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return ts->reset_gpio;
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}
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error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
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"reset-gpios");
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if (error) {
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dev_err(&spi->dev, "error requesting reset gpio: %d\n",
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error);
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return error;
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}
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ts->vio = devm_regulator_get(&spi->dev, "vio");
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if (IS_ERR(ts->vio)) {
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error = PTR_ERR(ts->vio);
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dev_err(&spi->dev, "vio regulator missing (%d)", error);
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return error;
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}
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} else {
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ts->reset_gpio = -1;
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ts->set_reset = pdata->set_reset;
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}
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mutex_init(&ts->mutex);
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@ -642,6 +708,9 @@ static int tsc2005_probe(struct spi_device *spi)
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input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
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if (np)
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touchscreen_parse_of_params(input_dev);
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input_dev->open = tsc2005_open;
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input_dev->close = tsc2005_close;
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@ -659,12 +728,19 @@ static int tsc2005_probe(struct spi_device *spi)
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return error;
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}
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/* enable regulator for DT */
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if (ts->vio) {
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error = regulator_enable(ts->vio);
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if (error)
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return error;
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}
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spi_set_drvdata(spi, ts);
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error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
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if (error) {
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dev_err(&spi->dev,
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"Failed to create sysfs attributes, err: %d\n", error);
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return error;
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goto disable_regulator;
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}
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error = input_register_device(ts->idev);
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@ -679,13 +755,21 @@ static int tsc2005_probe(struct spi_device *spi)
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err_remove_sysfs:
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sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
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disable_regulator:
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if (ts->vio)
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regulator_disable(ts->vio);
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return error;
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}
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static int tsc2005_remove(struct spi_device *spi)
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{
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struct tsc2005 *ts = spi_get_drvdata(spi);
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sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
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if (ts->vio)
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regulator_disable(ts->vio);
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return 0;
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}
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