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Date: Wed, 28 Oct 2015 19:12:34 -0500
From: Michael Welling <mwelling@...e.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>,
Tony Lindgren <tony@...mide.com>, Pavel Machek <pavel@....cz>,
Felipe Balbi <balbi@...com>,
Sebastian Reichel <sre@...nel.org>,
Roger Quadros <rogerq@...com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Cc: Michael Welling <mwelling@...e.org>
Subject: [PATCH v3] Input: tsc2005 - Add support for tsc2004
Adds support for the i2c based tsc2004.
Due to the overlapping functionality of the tsc2004 and tsc2005
the common code was moved to a core driver (tsc200x-core).
Signed-off-by: Michael Welling <mwelling@...e.org>
---
v3: Splits the tsc2004 and tsc2005 into separate drivers with
with common routines in tsc200x-core.
v2: Fixes Kconfig based on report for 0-day build bot.
.../bindings/input/touchscreen/tsc2004.txt | 38 +
drivers/input/touchscreen/Kconfig | 17 +
drivers/input/touchscreen/Makefile | 2 +
drivers/input/touchscreen/tsc2004.c | 73 ++
drivers/input/touchscreen/tsc2005.c | 707 +-----------------
drivers/input/touchscreen/tsc200x-core.c | 790 +++++++++++++++++++++
drivers/input/touchscreen/tsc200x-core.h | 13 +
7 files changed, 938 insertions(+), 702 deletions(-)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/tsc2004.txt
create mode 100644 drivers/input/touchscreen/tsc2004.c
create mode 100644 drivers/input/touchscreen/tsc200x-core.c
create mode 100644 drivers/input/touchscreen/tsc200x-core.h
diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2004.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2004.txt
new file mode 100644
index 0000000..14a37fb
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2004.txt
@@ -0,0 +1,38 @@
+* Texas Instruments tsc2004 touchscreen controller
+
+Required properties:
+ - compatible : "ti,tsc2004"
+ - interrupts : IRQ specifier
+ - vio-supply : Regulator specifier
+
+Optional properties:
+ - reset-gpios : GPIO specifier
+ - ti,x-plate-ohms : integer, resistance of the touchscreen's X plates
+ in ohm (defaults to 280)
+ - ti,esd-recovery-timeout-ms : integer, if the touchscreen does not respond after
+ the configured time (in milli seconds), the driver
+ will reset it. This is disabled by default.
+ - properties defined in touchscreen.txt
+
+Example:
+
+&i2c3 {
+ tsc2004@48 {
+ compatible = "ti,tsc2004";
+ reg = <0x48>;
+ vio-supply = <&vio>;
+
+ reset-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>;
+ interrupts-extended = <&gpio1 27 IRQ_TYPE_EDGE_RISING>;
+
+ touchscreen-fuzz-x = <4>;
+ touchscreen-fuzz-y = <7>;
+ touchscreen-fuzz-pressure = <2>;
+ touchscreen-size-x = <4096>;
+ touchscreen-size-y = <4096>;
+ touchscreen-max-pressure = <2048>;
+
+ ti,x-plate-ohms = <280>;
+ ti,esd-recovery-timeout-ms = <8000>;
+ };
+}
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 80cc698..e574f8c 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -939,10 +939,27 @@ config TOUCHSCREEN_TSC_SERIO
To compile this driver as a module, choose M here: the
module will be called tsc40.
+config TOUCHSCREEN_TSC200X
+ tristate
+
+config TOUCHSCREEN_TSC2004
+ tristate "TSC2004 based touchscreens"
+ depends on I2C
+ select REGMAP_I2C
+ select TOUCHSCREEN_TSC200X
+ help
+ Say Y here if you have a TSC2004 based touchscreen.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called tsc2004.
+
config TOUCHSCREEN_TSC2005
tristate "TSC2005 based touchscreens"
depends on SPI_MASTER
select REGMAP_SPI
+ select TOUCHSCREEN_TSC200X
help
Say Y here if you have a TSC2005 based touchscreen.
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 17435c7..810b047 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -69,6 +69,8 @@ obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
obj-$(CONFIG_TOUCHSCREEN_TSC_SERIO) += tsc40.o
+obj-$(CONFIG_TOUCHSCREEN_TSC200X) += tsc200x-core.o
+obj-$(CONFIG_TOUCHSCREEN_TSC2004) += tsc2004.o
obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
diff --git a/drivers/input/touchscreen/tsc2004.c b/drivers/input/touchscreen/tsc2004.c
new file mode 100644
index 0000000..01457a2
--- /dev/null
+++ b/drivers/input/touchscreen/tsc2004.c
@@ -0,0 +1,73 @@
+/*
+ * TSC2004 touchscreen driver
+ *
+ * Copyright (C) 2015 EMAC Inc.
+ * Copyright (C) 2015 QWERTY Embedded Design
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/pm.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include "tsc200x-core.h"
+
+static int tsc2004_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+
+{
+ return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,
+ devm_regmap_init_i2c(i2c,
+ &tsc2005_regmap_config));
+}
+
+static int tsc2004_remove(struct i2c_client *i2c)
+{
+ return tsc200x_remove(&i2c->dev);
+}
+
+static const struct i2c_device_id tsc2004_idtable[] = {
+ { "tsc2004", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
+
+#ifdef CONFIG_OF
+static const struct of_device_id tsc2004_of_match[] = {
+ { .compatible = "ti,tsc2004" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, tsc2004_of_match);
+#endif
+
+static SIMPLE_DEV_PM_OPS(tsc2004_pm_ops, tsc200x_suspend, tsc200x_resume);
+
+static struct i2c_driver tsc2004_driver = {
+ .driver = {
+ .name = "tsc2004",
+ .of_match_table = of_match_ptr(tsc2004_of_match),
+ .pm = &tsc2004_pm_ops,
+ },
+ .id_table = tsc2004_idtable,
+ .probe = tsc2004_probe,
+ .remove = tsc2004_remove,
+};
+
+module_i2c_driver(tsc2004_driver);
+
+MODULE_AUTHOR("Michael Welling <mwelling@...e.org>");
+MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
index 0f65d02..67d8808 100644
--- a/drivers/input/touchscreen/tsc2005.c
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -16,574 +16,22 @@
* 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/spi/spi.h>
-#include <linux/spi/tsc2005.h>
-#include <linux/regulator/consumer.h>
#include <linux/regmap.h>
-#include <linux/gpio/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 0x01 /* R/W access */
-#define TSC2005_REG_PND0 0x02 /* Power Not Down Control */
-#define TSC2005_REG_X (0x0 << 3)
-#define TSC2005_REG_Y (0x1 << 3)
-#define TSC2005_REG_Z1 (0x2 << 3)
-#define TSC2005_REG_Z2 (0x3 << 3)
-#define TSC2005_REG_AUX (0x4 << 3)
-#define TSC2005_REG_TEMP1 (0x5 << 3)
-#define TSC2005_REG_TEMP2 (0x6 << 3)
-#define TSC2005_REG_STATUS (0x7 << 3)
-#define TSC2005_REG_AUX_HIGH (0x8 << 3)
-#define TSC2005_REG_AUX_LOW (0x9 << 3)
-#define TSC2005_REG_TEMP_HIGH (0xA << 3)
-#define TSC2005_REG_TEMP_LOW (0xB << 3)
-#define TSC2005_REG_CFR0 (0xC << 3)
-#define TSC2005_REG_CFR1 (0xD << 3)
-#define TSC2005_REG_CFR2 (0xE << 3)
-#define TSC2005_REG_CONV_FUNC (0xF << 3)
-
-/* 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
+#include "tsc200x-core.h"
#define TSC2005_SPI_MAX_SPEED_HZ 10000000
-#define TSC2005_PENUP_TIME_MS 40
-
-static const struct regmap_range tsc2005_writable_ranges[] = {
- regmap_reg_range(TSC2005_REG_AUX_HIGH, TSC2005_REG_CFR2),
-};
-
-static const struct regmap_access_table tsc2005_writable_table = {
- .yes_ranges = tsc2005_writable_ranges,
- .n_yes_ranges = ARRAY_SIZE(tsc2005_writable_ranges),
-};
-
-static struct regmap_config tsc2005_regmap_config = {
- .reg_bits = 8,
- .val_bits = 16,
- .reg_stride = 0x08,
- .max_register = 0x78,
- .read_flag_mask = TSC2005_REG_READ,
- .write_flag_mask = TSC2005_REG_PND0,
- .wr_table = &tsc2005_writable_table,
- .use_single_rw = true,
-};
-
-struct tsc2005_data {
- u16 x;
- u16 y;
- u16 z1;
- u16 z2;
-} __packed;
-#define TSC2005_DATA_REGS 4
-
-struct tsc2005 {
- struct spi_device *spi;
- struct regmap *regmap;
-
- 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;
-
- struct gpio_desc *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 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;
- struct tsc2005_data tsdata;
- int error;
-
- /* read the coordinates */
- error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata,
- TSC2005_DATA_REGS);
- if (unlikely(error))
- goto out;
-
- /* validate position */
- if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))
- goto out;
-
- /* Skip reading if the pressure components are out of range */
- if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT))
- goto out;
- if (unlikely(tsdata.z1 >= tsdata.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 == tsdata.x && ts->in_y == tsdata.y &&
- ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.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 = tsdata.x;
- ts->in_y = tsdata.y;
- ts->in_z1 = tsdata.z1;
- ts->in_z2 = tsdata.z2;
-
- /* Compute touch pressure resistance using equation #1 */
- pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.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, tsdata.x, tsdata.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)
-{
- regmap_write(ts->regmap, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
- regmap_write(ts->regmap, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
- regmap_write(ts->regmap, 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)
- gpiod_set_value_cansleep(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 tsc2005 *ts = dev_get_drvdata(dev);
- unsigned int temp_high;
- unsigned int temp_high_orig;
- unsigned int temp_high_test;
- bool success = true;
- int error;
-
- mutex_lock(&ts->mutex);
-
- /*
- * Test TSC2005 communications via temp high register.
- */
- __tsc2005_disable(ts);
-
- error = regmap_read(ts->regmap, 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 = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test);
- if (error) {
- dev_warn(dev, "selftest failed: write error %d\n", error);
- success = false;
- goto out;
- }
-
- error = regmap_read(ts->regmap, 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 = regmap_read(ts->regmap, 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 tsc2005 *ts = dev_get_drvdata(dev);
- 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;
- unsigned int 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 = regmap_read(ts->regmap, 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 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)
@@ -593,161 +41,16 @@ static int tsc2005_probe(struct spi_device *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->regmap = devm_regmap_init_spi(spi, &tsc2005_regmap_config);
- if (IS_ERR(ts->regmap))
- return PTR_ERR(ts->regmap);
-
- ts->x_plate_ohm = x_plate_ohm;
- ts->esd_timeout = esd_timeout;
-
- ts->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
- GPIOD_OUT_HIGH);
- if (IS_ERR(ts->reset_gpio)) {
- error = PTR_ERR(ts->reset_gpio);
- dev_err(&spi->dev, "error acquiring reset gpio: %d\n", error);
- return error;
- }
-
- ts->vio = devm_regulator_get_optional(&spi->dev, "vio");
- if (IS_ERR(ts->vio)) {
- error = PTR_ERR(ts->vio);
- dev_err(&spi->dev, "vio regulator missing (%d)", error);
- return error;
- }
-
- if (!ts->reset_gpio && pdata)
- 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);
-
- 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_properties(input_dev, false);
-
- 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;
- }
-
- dev_set_drvdata(&spi->dev, 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;
+ return tsc200x_probe(&spi->dev, spi->irq, BUS_SPI,
+ devm_regmap_init_spi(spi, &tsc2005_regmap_config));
}
static int tsc2005_remove(struct spi_device *spi)
{
- struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
-
- 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 tsc2005 *ts = dev_get_drvdata(dev);
-
- 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 tsc2005 *ts = dev_get_drvdata(dev);
-
- mutex_lock(&ts->mutex);
-
- if (ts->suspended && ts->opened)
- __tsc2005_enable(ts);
-
- ts->suspended = false;
-
- mutex_unlock(&ts->mutex);
-
- return 0;
+ return tsc200x_remove(&spi->dev);
}
-static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
+static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc200x_suspend, tsc200x_resume);
static struct spi_driver tsc2005_driver = {
.driver = {
diff --git a/drivers/input/touchscreen/tsc200x-core.c b/drivers/input/touchscreen/tsc200x-core.c
new file mode 100644
index 0000000..b9c8280
--- /dev/null
+++ b/drivers/input/touchscreen/tsc200x-core.c
@@ -0,0 +1,790 @@
+/*
+ * TSC2004/TSC2005 touchscreen driver core
+ *
+ * Copyright (C) 2006-2010 Nokia Corporation
+ * Copyright (C) 2015 EMAC Inc.
+ * Copyright (C) 2015 QWERTY Embedded Design
+ *
+ * Author: Lauri Leukkunen <lauri.leukkunen@...ia.com>
+ * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@...ia.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.
+ *
+ */
+
+#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/i2c.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/tsc2005.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+#include <linux/gpio/consumer.h>
+#include "tsc200x-core.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 0x01 /* R/W access */
+#define TSC2005_REG_PND0 0x02 /* Power Not Down Control */
+#define TSC2005_REG_X (0x0 << 3)
+#define TSC2005_REG_Y (0x1 << 3)
+#define TSC2005_REG_Z1 (0x2 << 3)
+#define TSC2005_REG_Z2 (0x3 << 3)
+#define TSC2005_REG_AUX (0x4 << 3)
+#define TSC2005_REG_TEMP1 (0x5 << 3)
+#define TSC2005_REG_TEMP2 (0x6 << 3)
+#define TSC2005_REG_STATUS (0x7 << 3)
+#define TSC2005_REG_AUX_HIGH (0x8 << 3)
+#define TSC2005_REG_AUX_LOW (0x9 << 3)
+#define TSC2005_REG_TEMP_HIGH (0xA << 3)
+#define TSC2005_REG_TEMP_LOW (0xB << 3)
+#define TSC2005_REG_CFR0 (0xC << 3)
+#define TSC2005_REG_CFR1 (0xD << 3)
+#define TSC2005_REG_CFR2 (0xE << 3)
+#define TSC2005_REG_CONV_FUNC (0xF << 3)
+
+/* 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_PENUP_TIME_MS 40
+
+static const struct regmap_range tsc2005_writable_ranges[] = {
+ regmap_reg_range(TSC2005_REG_AUX_HIGH, TSC2005_REG_CFR2),
+};
+
+static const struct regmap_access_table tsc2005_writable_table = {
+ .yes_ranges = tsc2005_writable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(tsc2005_writable_ranges),
+};
+
+const struct regmap_config tsc2005_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .reg_stride = 0x08,
+ .max_register = 0x78,
+ .read_flag_mask = TSC2005_REG_READ,
+ .write_flag_mask = TSC2005_REG_PND0,
+ .wr_table = &tsc2005_writable_table,
+ .use_single_rw = true,
+};
+EXPORT_SYMBOL_GPL(tsc2005_regmap_config);
+
+struct tsc2005_data {
+ u16 x;
+ u16 y;
+ u16 z1;
+ u16 z2;
+} __packed;
+#define TSC2005_DATA_REGS 4
+
+struct tsc2005 {
+ struct device *dev;
+ __u16 bustype;
+
+ struct regmap *regmap;
+
+ 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;
+
+ struct gpio_desc *reset_gpio;
+ void (*set_reset)(bool enable);
+
+ int irq;
+};
+
+#if defined(CONFIG_SPI_MASTER)
+static int tsc2005_cmd_spi(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;
+ struct spi_device *spi = to_spi_device(ts->dev);
+ int error;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ error = spi_sync(spi, &msg);
+ if (error) {
+ dev_err(ts->dev, "%s: failed, command: %x, spi error: %d\n",
+ __func__, cmd, error);
+ return error;
+ }
+
+ return 0;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_I2C)
+static int tsc2005_cmd_i2c(struct tsc2005 *ts, u8 cmd)
+{
+ u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
+ s32 data;
+ struct i2c_client *i2c = to_i2c_client(ts->dev);
+
+ data = i2c_smbus_write_byte(i2c, tx);
+ if (data < 0) {
+ dev_err(ts->dev, "%s: failed, command: %x i2c error: %d\n",
+ __func__, cmd, data);
+ return data;
+ }
+
+ return 0;
+}
+#endif
+
+static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
+{
+#if defined(CONFIG_SPI_MASTER)
+ if (ts->bustype == BUS_SPI)
+ return tsc2005_cmd_spi(ts, cmd);
+#endif
+
+#if IS_ENABLED(CONFIG_I2C)
+ if (ts->bustype == BUS_I2C)
+ return tsc2005_cmd_i2c(ts, cmd);
+#endif
+
+ return -ENODEV;
+}
+
+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->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;
+ struct tsc2005_data tsdata;
+ int error;
+
+ /* read the coordinates */
+ error = regmap_bulk_read(ts->regmap, TSC2005_REG_X, &tsdata,
+ TSC2005_DATA_REGS);
+ if (unlikely(error))
+ goto out;
+
+ /* validate position */
+ if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))
+ goto out;
+
+ /* Skip reading if the pressure components are out of range */
+ if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT))
+ goto out;
+ if (unlikely(tsdata.z1 >= tsdata.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 == tsdata.x && ts->in_y == tsdata.y &&
+ ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.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 = tsdata.x;
+ ts->in_y = tsdata.y;
+ ts->in_z1 = tsdata.z1;
+ ts->in_z2 = tsdata.z2;
+
+ /* Compute touch pressure resistance using equation #1 */
+ pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.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, tsdata.x, tsdata.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)
+{
+ regmap_write(ts->regmap, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
+ regmap_write(ts->regmap, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
+ regmap_write(ts->regmap, 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)
+ gpiod_set_value_cansleep(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->irq);
+ del_timer_sync(&ts->penup_timer);
+
+ cancel_delayed_work_sync(&ts->esd_work);
+
+ enable_irq(ts->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 tsc2005 *ts = dev_get_drvdata(dev);
+ unsigned int temp_high;
+ unsigned int temp_high_orig;
+ unsigned int temp_high_test;
+ bool success = true;
+ int error;
+
+ mutex_lock(&ts->mutex);
+
+ /*
+ * Test TSC2005 communications via temp high register.
+ */
+ __tsc2005_disable(ts);
+
+ error = regmap_read(ts->regmap, 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 = regmap_write(ts->regmap, TSC2005_REG_TEMP_HIGH, temp_high_test);
+ if (error) {
+ dev_warn(dev, "selftest failed: write error %d\n", error);
+ success = false;
+ goto out;
+ }
+
+ error = regmap_read(ts->regmap, 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 = regmap_read(ts->regmap, 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 tsc2005 *ts = dev_get_drvdata(dev);
+ 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;
+ unsigned int 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 = regmap_read(ts->regmap, 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->dev, "TSC2005 not responding - resetting\n");
+
+ disable_irq(ts->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->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);
+}
+
+int tsc200x_probe(struct device *dev, int irq, __u16 bustype,
+ struct regmap *regmap)
+{
+ const struct tsc2005_platform_data *pdata = dev_get_platdata(dev);
+ struct device_node *np = 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(dev, "no platform data\n");
+ return -ENODEV;
+ }
+
+ if (irq <= 0) {
+ dev_err(dev, "no irq\n");
+ return -ENODEV;
+ }
+
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ 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);
+ }
+
+ ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ input_dev = devm_input_allocate_device(dev);
+ if (!input_dev)
+ return -ENOMEM;
+
+ ts->irq = irq;
+ ts->dev = dev;
+ ts->idev = input_dev;
+ ts->regmap = regmap;
+ ts->bustype = bustype;
+
+ ts->x_plate_ohm = x_plate_ohm;
+ ts->esd_timeout = esd_timeout;
+
+ ts->reset_gpio = devm_gpiod_get_optional(dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(ts->reset_gpio)) {
+ error = PTR_ERR(ts->reset_gpio);
+ dev_err(dev, "error acquiring reset gpio: %d\n", error);
+ return error;
+ }
+
+ ts->vio = devm_regulator_get_optional(dev, "vio");
+ if (IS_ERR(ts->vio)) {
+ error = PTR_ERR(ts->vio);
+ dev_err(dev, "vio regulator missing (%d)", error);
+ return error;
+ }
+
+ if (!ts->reset_gpio && pdata)
+ 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);
+
+ snprintf(ts->phys, sizeof(ts->phys),
+ "%s/input-ts", dev_name(dev));
+
+ input_dev->name = "TSC2005 touchscreen";
+ input_dev->phys = ts->phys;
+ input_dev->id.bustype = bustype;
+ input_dev->dev.parent = 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_properties(input_dev, false);
+
+ 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(dev, irq, NULL,
+ tsc2005_irq_thread,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ "tsc2005", ts);
+ if (error) {
+ dev_err(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;
+ }
+
+ dev_set_drvdata(dev, ts);
+ error = sysfs_create_group(&dev->kobj, &tsc2005_attr_group);
+ if (error) {
+ dev_err(dev,
+ "Failed to create sysfs attributes, err: %d\n", error);
+ goto disable_regulator;
+ }
+
+ error = input_register_device(ts->idev);
+ if (error) {
+ dev_err(dev,
+ "Failed to register input device, err: %d\n", error);
+ goto err_remove_sysfs;
+ }
+
+ irq_set_irq_wake(irq, 1);
+ return 0;
+
+err_remove_sysfs:
+ sysfs_remove_group(&dev->kobj, &tsc2005_attr_group);
+disable_regulator:
+ if (ts->vio)
+ regulator_disable(ts->vio);
+ return error;
+}
+EXPORT_SYMBOL_GPL(tsc200x_probe);
+
+int tsc200x_remove(struct device *dev)
+{
+ struct tsc2005 *ts = dev_get_drvdata(dev);
+
+ sysfs_remove_group(&dev->kobj, &tsc2005_attr_group);
+
+ if (ts->vio)
+ regulator_disable(ts->vio);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tsc200x_remove);
+
+int __maybe_unused tsc200x_suspend(struct device *dev)
+{
+ struct tsc2005 *ts = dev_get_drvdata(dev);
+
+ mutex_lock(&ts->mutex);
+
+ if (!ts->suspended && ts->opened)
+ __tsc2005_disable(ts);
+
+ ts->suspended = true;
+
+ mutex_unlock(&ts->mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tsc200x_suspend);
+
+int __maybe_unused tsc200x_resume(struct device *dev)
+{
+ struct tsc2005 *ts = dev_get_drvdata(dev);
+
+ mutex_lock(&ts->mutex);
+
+ if (ts->suspended && ts->opened)
+ __tsc2005_enable(ts);
+
+ ts->suspended = false;
+
+ mutex_unlock(&ts->mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tsc200x_resume);
+
+MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@...ia.com>");
+MODULE_DESCRIPTION("TSC200X Touchscreen Driver Core");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/tsc200x-core.h b/drivers/input/touchscreen/tsc200x-core.h
new file mode 100644
index 0000000..58519a2
--- /dev/null
+++ b/drivers/input/touchscreen/tsc200x-core.h
@@ -0,0 +1,13 @@
+#ifndef _TSC200X_CORE_H
+#define _TSC200X_CORE_H
+
+extern const struct regmap_config tsc2005_regmap_config;
+
+int __maybe_unused tsc200x_suspend(struct device *dev);
+int __maybe_unused tsc200x_resume(struct device *dev);
+
+int tsc200x_probe(struct device *dev, int irq, __u16 bustype,
+ struct regmap *regmap);
+int tsc200x_remove(struct device *dev);
+
+#endif
--
2.1.4
--
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