--- /dev/null
+/*
+ * TSC2005 touchscreen driver
+ *
+ * Copyright (C) 2006-2010 Nokia Corporation
+ *
+ * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
+ * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/tsc2005.h>
+#include <linux/regulator/consumer.h>
+
+/*
+ * The touchscreen interface operates as follows:
+ *
+ * 1) Pen is pressed against the touchscreen.
+ * 2) TSC2005 performs AD conversion.
+ * 3) After the conversion is done TSC2005 drives DAV line down.
+ * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
+ * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
+ * values.
+ * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
+ * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
+ * 7) When the penup timer expires, there have not been touch or DAV interrupts
+ * during the last 40ms which means the pen has been lifted.
+ *
+ * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
+ * after a configurable period (in ms) of activity. If esd_timeout is 0, the
+ * watchdog is disabled.
+ */
+
+/* control byte 1 */
+#define TSC2005_CMD 0x80
+#define TSC2005_CMD_NORMAL 0x00
+#define TSC2005_CMD_STOP 0x01
+#define TSC2005_CMD_12BIT 0x04
+
+/* control byte 0 */
+#define TSC2005_REG_READ 0x0001
+#define TSC2005_REG_PND0 0x0002
+#define TSC2005_REG_X 0x0000
+#define TSC2005_REG_Y 0x0008
+#define TSC2005_REG_Z1 0x0010
+#define TSC2005_REG_Z2 0x0018
+#define TSC2005_REG_TEMP_HIGH 0x0050
+#define TSC2005_REG_CFR0 0x0060
+#define TSC2005_REG_CFR1 0x0068
+#define TSC2005_REG_CFR2 0x0070
+
+/* configuration register 0 */
+#define TSC2005_CFR0_PRECHARGE_276US 0x0040
+#define TSC2005_CFR0_STABTIME_1MS 0x0300
+#define TSC2005_CFR0_CLOCK_1MHZ 0x1000
+#define TSC2005_CFR0_RESOLUTION12 0x2000
+#define TSC2005_CFR0_PENMODE 0x8000
+#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \
+ TSC2005_CFR0_CLOCK_1MHZ | \
+ TSC2005_CFR0_RESOLUTION12 | \
+ TSC2005_CFR0_PRECHARGE_276US | \
+ TSC2005_CFR0_PENMODE)
+
+/* bits common to both read and write of configuration register 0 */
+#define TSC2005_CFR0_RW_MASK 0x3fff
+
+/* configuration register 1 */
+#define TSC2005_CFR1_BATCHDELAY_4MS 0x0003
+#define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS
+
+/* configuration register 2 */
+#define TSC2005_CFR2_MAVE_Z 0x0004
+#define TSC2005_CFR2_MAVE_Y 0x0008
+#define TSC2005_CFR2_MAVE_X 0x0010
+#define TSC2005_CFR2_AVG_7 0x0800
+#define TSC2005_CFR2_MEDIUM_15 0x3000
+#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \
+ TSC2005_CFR2_MAVE_Y | \
+ TSC2005_CFR2_MAVE_Z | \
+ TSC2005_CFR2_MEDIUM_15 | \
+ TSC2005_CFR2_AVG_7)
+
+#define MAX_12BIT 0xfff
+#define TSC2005_DEF_X_FUZZ 4
+#define TSC2005_DEF_Y_FUZZ 8
+#define TSC2005_DEF_P_FUZZ 2
+#define TSC2005_DEF_RESISTOR 280
+
+#define TSC2005_SPI_MAX_SPEED_HZ 10000000
+#define TSC2005_PENUP_TIME_MS 40
+
+struct tsc2005_spi_rd {
+ struct spi_transfer spi_xfer;
+ u32 spi_tx;
+ u32 spi_rx;
+};
+
+struct tsc2005 {
+ struct spi_device *spi;
+
+ struct spi_message spi_read_msg;
+ struct tsc2005_spi_rd spi_x;
+ struct tsc2005_spi_rd spi_y;
+ struct tsc2005_spi_rd spi_z1;
+ struct tsc2005_spi_rd spi_z2;
+
+ struct input_dev *idev;
+ char phys[32];
+
+ struct mutex mutex;
+
+ /* raw copy of previous x,y,z */
+ int in_x;
+ int in_y;
+ int in_z1;
+ int in_z2;
+
+ spinlock_t lock;
+ struct timer_list penup_timer;
+
+ unsigned int esd_timeout;
+ struct delayed_work esd_work;
+ unsigned long last_valid_interrupt;
+
+ unsigned int x_plate_ohm;
+
+ bool opened;
+ bool suspended;
+
+ bool pen_down;
+
+ struct regulator *vio;
+
+ int reset_gpio;
+ void (*set_reset)(bool enable);
+};
+
+static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
+{
+ u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
+ struct spi_transfer xfer = {
+ .tx_buf = &tx,
+ .len = 1,
+ .bits_per_word = 8,
+ };
+ struct spi_message msg;
+ int error;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ error = spi_sync(ts->spi, &msg);
+ if (error) {
+ dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
+ __func__, cmd, error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
+{
+ u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
+ struct spi_transfer xfer = {
+ .tx_buf = &tx,
+ .len = 4,
+ .bits_per_word = 24,
+ };
+ struct spi_message msg;
+ int error;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ error = spi_sync(ts->spi, &msg);
+ if (error) {
+ dev_err(&ts->spi->dev,
+ "%s: failed, register: %x, value: %x, error: %d\n",
+ __func__, reg, value, error);
+ return error;
+ }
+
+ return 0;
+}
+
+static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
+{
+ memset(rd, 0, sizeof(*rd));
+
+ rd->spi_tx = (reg | TSC2005_REG_READ) << 16;
+ rd->spi_xfer.tx_buf = &rd->spi_tx;
+ rd->spi_xfer.rx_buf = &rd->spi_rx;
+ rd->spi_xfer.len = 4;
+ rd->spi_xfer.bits_per_word = 24;
+ rd->spi_xfer.cs_change = !last;
+}
+
+static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
+{
+ struct tsc2005_spi_rd spi_rd;
+ struct spi_message msg;
+ int error;
+
+ tsc2005_setup_read(&spi_rd, reg, true);
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&spi_rd.spi_xfer, &msg);
+
+ error = spi_sync(ts->spi, &msg);
+ if (error)
+ return error;
+
+ *value = spi_rd.spi_rx;
+ return 0;
+}
+
+static void tsc2005_update_pen_state(struct tsc2005 *ts,
+ int x, int y, int pressure)
+{
+ if (pressure) {
+ input_report_abs(ts->idev, ABS_X, x);
+ input_report_abs(ts->idev, ABS_Y, y);
+ input_report_abs(ts->idev, ABS_PRESSURE, pressure);
+ if (!ts->pen_down) {
+ input_report_key(ts->idev, BTN_TOUCH, !!pressure);
+ ts->pen_down = true;
+ }
+ } else {
+ input_report_abs(ts->idev, ABS_PRESSURE, 0);
+ if (ts->pen_down) {
+ input_report_key(ts->idev, BTN_TOUCH, 0);
+ ts->pen_down = false;
+ }
+ }
+ input_sync(ts->idev);
+ dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
+ pressure);
+}
+
+static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
+{
+ struct tsc2005 *ts = _ts;
+ unsigned long flags;
+ unsigned int pressure;
+ u32 x, y;
+ u32 z1, z2;
+ int error;
+
+ /* read the coordinates */
+ error = spi_sync(ts->spi, &ts->spi_read_msg);
+ if (unlikely(error))
+ goto out;
+
+ x = ts->spi_x.spi_rx;
+ y = ts->spi_y.spi_rx;
+ z1 = ts->spi_z1.spi_rx;
+ z2 = ts->spi_z2.spi_rx;
+
+ /* validate position */
+ if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
+ goto out;
+
+ /* Skip reading if the pressure components are out of range */
+ if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
+ goto out;
+
+ /*
+ * Skip point if this is a pen down with the exact same values as
+ * the value before pen-up - that implies SPI fed us stale data
+ */
+ if (!ts->pen_down &&
+ ts->in_x == x && ts->in_y == y &&
+ ts->in_z1 == z1 && ts->in_z2 == z2) {
+ goto out;
+ }
+
+ /*
+ * At this point we are happy we have a valid and useful reading.
+ * Remember it for later comparisons. We may now begin downsampling.
+ */
+ ts->in_x = x;
+ ts->in_y = y;
+ ts->in_z1 = z1;
+ ts->in_z2 = z2;
+
+ /* Compute touch pressure resistance using equation #1 */
+ pressure = x * (z2 - z1) / z1;
+ pressure = pressure * ts->x_plate_ohm / 4096;
+ if (unlikely(pressure > MAX_12BIT))
+ goto out;
+
+ spin_lock_irqsave(&ts->lock, flags);
+
+ tsc2005_update_pen_state(ts, x, y, pressure);
+ mod_timer(&ts->penup_timer,
+ jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
+
+ spin_unlock_irqrestore(&ts->lock, flags);
+
+ ts->last_valid_interrupt = jiffies;
+out:
+ return IRQ_HANDLED;
+}
+
+static void tsc2005_penup_timer(unsigned long data)
+{
+ struct tsc2005 *ts = (struct tsc2005 *)data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ts->lock, flags);
+ tsc2005_update_pen_state(ts, 0, 0, 0);
+ spin_unlock_irqrestore(&ts->lock, flags);
+}
+
+static void tsc2005_start_scan(struct tsc2005 *ts)
+{
+ tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
+ tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
+ tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
+ tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
+}
+
+static void tsc2005_stop_scan(struct tsc2005 *ts)
+{
+ tsc2005_cmd(ts, TSC2005_CMD_STOP);
+}
+
+static void tsc2005_set_reset(struct tsc2005 *ts, bool enable)
+{
+ if (ts->reset_gpio >= 0)
+ gpio_set_value(ts->reset_gpio, enable);
+ else if (ts->set_reset)
+ ts->set_reset(enable);
+}
+
+/* must be called with ts->mutex held */
+static void __tsc2005_disable(struct tsc2005 *ts)
+{
+ tsc2005_stop_scan(ts);
+
+ disable_irq(ts->spi->irq);
+ del_timer_sync(&ts->penup_timer);
+
+ cancel_delayed_work_sync(&ts->esd_work);
+
+ enable_irq(ts->spi->irq);
+}
+
+/* must be called with ts->mutex held */
+static void __tsc2005_enable(struct tsc2005 *ts)
+{
+ tsc2005_start_scan(ts);
+
+ if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) {
+ ts->last_valid_interrupt = jiffies;
+ schedule_delayed_work(&ts->esd_work,
+ round_jiffies_relative(
+ msecs_to_jiffies(ts->esd_timeout)));
+ }
+
+}
+
+static ssize_t tsc2005_selftest_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct tsc2005 *ts = spi_get_drvdata(spi);
+ u16 temp_high;
+ u16 temp_high_orig;
+ u16 temp_high_test;
+ bool success = true;
+ int error;
+
+ mutex_lock(&ts->mutex);
+
+ /*
+ * Test TSC2005 communications via temp high register.
+ */
+ __tsc2005_disable(ts);
+
+ error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
+ if (error) {
+ dev_warn(dev, "selftest failed: read error %d\n", error);
+ success = false;
+ goto out;
+ }
+
+ temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
+
+ error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
+ if (error) {
+ dev_warn(dev, "selftest failed: write error %d\n", error);
+ success = false;
+ goto out;
+ }
+
+ error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
+ if (error) {
+ dev_warn(dev, "selftest failed: read error %d after write\n",
+ error);
+ success = false;
+ goto out;
+ }
+
+ if (temp_high != temp_high_test) {
+ dev_warn(dev, "selftest failed: %d != %d\n",
+ temp_high, temp_high_test);
+ success = false;
+ }
+
+ /* hardware reset */
+ tsc2005_set_reset(ts, false);
+ usleep_range(100, 500); /* only 10us required */
+ tsc2005_set_reset(ts, true);
+
+ if (!success)
+ goto out;
+
+ /* test that the reset really happened */
+ error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
+ if (error) {
+ dev_warn(dev, "selftest failed: read error %d after reset\n",
+ error);
+ success = false;
+ goto out;
+ }
+
+ if (temp_high != temp_high_orig) {
+ dev_warn(dev, "selftest failed after reset: %d != %d\n",
+ temp_high, temp_high_orig);
+ success = false;
+ }
+
+out:
+ __tsc2005_enable(ts);
+ mutex_unlock(&ts->mutex);
+
+ return sprintf(buf, "%d\n", success);
+}
+
+static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
+
+static struct attribute *tsc2005_attrs[] = {
+ &dev_attr_selftest.attr,
+ NULL
+};
+
+static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct spi_device *spi = to_spi_device(dev);
+ struct tsc2005 *ts = spi_get_drvdata(spi);
+ umode_t mode = attr->mode;
+
+ if (attr == &dev_attr_selftest.attr) {
+ if (!ts->set_reset && !ts->reset_gpio)
+ mode = 0;
+ }
+
+ return mode;
+}
+
+static const struct attribute_group tsc2005_attr_group = {
+ .is_visible = tsc2005_attr_is_visible,
+ .attrs = tsc2005_attrs,
+};
+
+static void tsc2005_esd_work(struct work_struct *work)
+{
+ struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
+ int error;
+ u16 r;
+
+ if (!mutex_trylock(&ts->mutex)) {
+ /*
+ * If the mutex is taken, it means that disable or enable is in
+ * progress. In that case just reschedule the work. If the work
+ * is not needed, it will be canceled by disable.
+ */
+ goto reschedule;
+ }
+
+ if (time_is_after_jiffies(ts->last_valid_interrupt +
+ msecs_to_jiffies(ts->esd_timeout)))
+ goto out;
+
+ /* We should be able to read register without disabling interrupts. */
+ error = tsc2005_read(ts, TSC2005_REG_CFR0, &r);
+ if (!error &&
+ !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
+ goto out;
+ }
+
+ /*
+ * If we could not read our known value from configuration register 0
+ * then we should reset the controller as if from power-up and start
+ * scanning again.
+ */
+ dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
+
+ disable_irq(ts->spi->irq);
+ del_timer_sync(&ts->penup_timer);
+
+ tsc2005_update_pen_state(ts, 0, 0, 0);
+
+ tsc2005_set_reset(ts, false);
+ usleep_range(100, 500); /* only 10us required */
+ tsc2005_set_reset(ts, true);
+
+ enable_irq(ts->spi->irq);
+ tsc2005_start_scan(ts);
+
+out:
+ mutex_unlock(&ts->mutex);
+reschedule:
+ /* re-arm the watchdog */
+ schedule_delayed_work(&ts->esd_work,
+ round_jiffies_relative(
+ msecs_to_jiffies(ts->esd_timeout)));
+}
+
+static int tsc2005_open(struct input_dev *input)
+{
+ struct tsc2005 *ts = input_get_drvdata(input);
+
+ mutex_lock(&ts->mutex);
+
+ if (!ts->suspended)
+ __tsc2005_enable(ts);
+
+ ts->opened = true;
+
+ mutex_unlock(&ts->mutex);
+
+ return 0;
+}
+
+static void tsc2005_close(struct input_dev *input)
+{
+ struct tsc2005 *ts = input_get_drvdata(input);
+
+ mutex_lock(&ts->mutex);
+
+ if (!ts->suspended)
+ __tsc2005_disable(ts);
+
+ ts->opened = false;
+
+ mutex_unlock(&ts->mutex);
+}
+
+static void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
+{
+ tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
+ tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
+ tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
+ tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);
+
+ spi_message_init(&ts->spi_read_msg);
+ spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
+ spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
+ spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
+ spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
+}
+
+static int tsc2005_probe(struct spi_device *spi)
+{
+ const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
+ struct device_node *np = spi->dev.of_node;
+
+ struct tsc2005 *ts;
+ struct input_dev *input_dev;
+ unsigned int max_x = MAX_12BIT;
+ unsigned int max_y = MAX_12BIT;
+ unsigned int max_p = MAX_12BIT;
+ unsigned int fudge_x = TSC2005_DEF_X_FUZZ;
+ unsigned int fudge_y = TSC2005_DEF_Y_FUZZ;
+ unsigned int fudge_p = TSC2005_DEF_P_FUZZ;
+ unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR;
+ unsigned int esd_timeout;
+ int error;
+
+ if (!np && !pdata) {
+ dev_err(&spi->dev, "no platform data\n");
+ return -ENODEV;
+ }
+
+ if (spi->irq <= 0) {
+ dev_err(&spi->dev, "no irq\n");
+ return -ENODEV;
+ }
+
+ if (pdata) {
+ fudge_x = pdata->ts_x_fudge;
+ fudge_y = pdata->ts_y_fudge;
+ fudge_p = pdata->ts_pressure_fudge;
+ max_x = pdata->ts_x_max;
+ max_y = pdata->ts_y_max;
+ max_p = pdata->ts_pressure_max;
+ x_plate_ohm = pdata->ts_x_plate_ohm;
+ esd_timeout = pdata->esd_timeout_ms;
+ } else {
+ x_plate_ohm = TSC2005_DEF_RESISTOR;
+ of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm);
+ esd_timeout = 0;
+ of_property_read_u32(np, "ti,esd-recovery-timeout-ms",
+ &esd_timeout);
+ }
+
+ spi->mode = SPI_MODE_0;
+ spi->bits_per_word = 8;
+ if (!spi->max_speed_hz)
+ spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
+
+ error = spi_setup(spi);
+ if (error)
+ return error;
+
+ ts = devm_kzalloc(&spi->dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ input_dev = devm_input_allocate_device(&spi->dev);
+ if (!input_dev)
+ return -ENOMEM;
+
+ ts->spi = spi;
+ ts->idev = input_dev;
+
+ ts->x_plate_ohm = x_plate_ohm;
+ ts->esd_timeout = esd_timeout;
+
+ if (np) {
+ ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
+ if (ts->reset_gpio == -EPROBE_DEFER)
+ return ts->reset_gpio;
+ if (ts->reset_gpio < 0) {
+ dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
+ ts->reset_gpio);
+ return ts->reset_gpio;
+ }
+
+ error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
+ "reset-gpios");
+ if (error) {
+ dev_err(&spi->dev, "error requesting reset gpio: %d\n",
+ error);
+ return error;
+ }
+
+ ts->vio = devm_regulator_get(&spi->dev, "vio");
+ if (IS_ERR(ts->vio)) {
+ error = PTR_ERR(ts->vio);
+ dev_err(&spi->dev, "vio regulator missing (%d)", error);
+ return error;
+ }
+ } else {
+ ts->reset_gpio = -1;
+ ts->set_reset = pdata->set_reset;
+ }
+
+ mutex_init(&ts->mutex);
+
+ spin_lock_init(&ts->lock);
+ setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
+
+ INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);
+
+ tsc2005_setup_spi_xfer(ts);
+
+ snprintf(ts->phys, sizeof(ts->phys),
+ "%s/input-ts", dev_name(&spi->dev));
+
+ input_dev->name = "TSC2005 touchscreen";
+ input_dev->phys = ts->phys;
+ input_dev->id.bustype = BUS_SPI;
+ input_dev->dev.parent = &spi->dev;
+ input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
+ input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+ input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
+ input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
+ input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
+
+ if (np)
+ touchscreen_parse_of_params(input_dev);
+
+ input_dev->open = tsc2005_open;
+ input_dev->close = tsc2005_close;
+
+ input_set_drvdata(input_dev, ts);
+
+ /* Ensure the touchscreen is off */
+ tsc2005_stop_scan(ts);
+
+ error = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
+ tsc2005_irq_thread,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ "tsc2005", ts);
+ if (error) {
+ dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
+ return error;
+ }
+
+ /* enable regulator for DT */
+ if (ts->vio) {
+ error = regulator_enable(ts->vio);
+ if (error)
+ return error;
+ }
+
+ spi_set_drvdata(spi, ts);
+ error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
+ if (error) {
+ dev_err(&spi->dev,
+ "Failed to create sysfs attributes, err: %d\n", error);
+ goto disable_regulator;
+ }
+
+ error = input_register_device(ts->idev);
+ if (error) {
+ dev_err(&spi->dev,
+ "Failed to register input device, err: %d\n", error);
+ goto err_remove_sysfs;
+ }
+
+ irq_set_irq_wake(spi->irq, 1);
+ return 0;
+
+err_remove_sysfs:
+ sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
+disable_regulator:
+ if (ts->vio)
+ regulator_disable(ts->vio);
+ return error;
+}
+
+static int tsc2005_remove(struct spi_device *spi)
+{
+ struct tsc2005 *ts = spi_get_drvdata(spi);
+
+ sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
+
+ if (ts->vio)
+ regulator_disable(ts->vio);
+
+ return 0;
+}
+
+static int __maybe_unused tsc2005_suspend(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct tsc2005 *ts = spi_get_drvdata(spi);
+
+ mutex_lock(&ts->mutex);
+
+ if (!ts->suspended && ts->opened)
+ __tsc2005_disable(ts);
+
+ ts->suspended = true;
+
+ mutex_unlock(&ts->mutex);
+
+ return 0;
+}
+
+static int __maybe_unused tsc2005_resume(struct device *dev)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct tsc2005 *ts = spi_get_drvdata(spi);
+
+ mutex_lock(&ts->mutex);
+
+ if (ts->suspended && ts->opened)
+ __tsc2005_enable(ts);
+
+ ts->suspended = false;
+
+ mutex_unlock(&ts->mutex);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
+
+static struct spi_driver tsc2005_driver = {
+ .driver = {
+ .name = "tsc2005",
+ .owner = THIS_MODULE,
+ .pm = &tsc2005_pm_ops,
+ },
+ .probe = tsc2005_probe,
+ .remove = tsc2005_remove,
+};
+
+module_spi_driver(tsc2005_driver);
+
+MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
+MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:tsc2005");
Code Review / kvmfornfv.git / blobdiff