From: Lauri Leukkunen <lauri.leukkunen@xxxxxxxxx>
Introduce a driver for the Texas Instruments TSC2005 touchscreen
controller. It is one of the peripherals on the RX-51 board.
Includes additional modifications by David Brownell, Phil Carmody,
Imre Deak, Hiroshi DOYU, Ari Kauppi, Tony Lindgren, Jarkko Nikula,
Eero Nurkkala and Roman Tereshonkov.
Signed-off-by: Lauri Leukkunen <lauri.leukkunen@xxxxxxxxx>
[aaro.koskinen@xxxxxxxxx: patch description, rebasing & cleanup]
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxxxxx>
CC: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
CC: Phil Carmody <ext-phil.2.carmody@xxxxxxxxx>
CC: Imre Deak <imre.deak@xxxxxxxxx>
CC: Hiroshi DOYU <Hiroshi.DOYU@xxxxxxxxx>
CC: Ari Kauppi <Ext-Ari.Kauppi@xxxxxxxxx>
CC: Tony Lindgren <tony@xxxxxxxxxxx>
CC: Jarkko Nikula <jhnikula@xxxxxxxxx>
CC: Eero Nurkkala <ext-eero.nurkkala@xxxxxxxxx>
CC: Roman Tereshonkov <roman.tereshonkov@xxxxxxxxx>
---
arch/arm/configs/rx51_defconfig | 1 +
arch/arm/mach-omap2/board-rx51-peripherals.c | 66 ++
drivers/input/touchscreen/Kconfig | 11 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/tsc2005.c | 958 ++++++++++++++++++++++++++
include/linux/spi/tsc2005.h | 30 +
6 files changed, 1067 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/tsc2005.c
create mode 100644 include/linux/spi/tsc2005.h
diff --git a/arch/arm/configs/rx51_defconfig b/arch/arm/configs/rx51_defconfig
index e7e3133..b10de8f 100644
--- a/arch/arm/configs/rx51_defconfig
+++ b/arch/arm/configs/rx51_defconfig
@@ -802,6 +802,7 @@ CONFIG_INPUT_TOUCHSCREEN=y
# CONFIG_TOUCHSCREEN_TOUCHWIN is not set
# CONFIG_TOUCHSCREEN_USB_COMPOSITE is not set
# CONFIG_TOUCHSCREEN_TOUCHIT213 is not set
+CONFIG_TOUCHSCREEN_TSC2005=m
# CONFIG_TOUCHSCREEN_TSC2007 is not set
CONFIG_INPUT_MISC=y
# CONFIG_INPUT_ATI_REMOTE is not set
diff --git a/arch/arm/mach-omap2/board-rx51-peripherals.c b/arch/arm/mach-omap2/board-rx51-peripherals.c
index c1af532..21d0b2b 100644
--- a/arch/arm/mach-omap2/board-rx51-peripherals.c
+++ b/arch/arm/mach-omap2/board-rx51-peripherals.c
@@ -13,6 +13,7 @@
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/spi/spi.h>
+#include <linux/spi/tsc2005.h>
#include <linux/i2c.h>
#include <linux/i2c/twl4030.h>
#include <linux/clk.h>
@@ -509,6 +510,68 @@ static inline void board_onenand_init(void)
#endif
+#define RX51_TSC2005_RESET_GPIO 104
+#define RX51_TSC2005_IRQ_GPIO 100
+
+static struct omap2_mcspi_device_config tsc2005_mcspi_config = {
+ .turbo_mode = 0,
+ .single_channel = 1,
+};
+
+static struct tsc2005_platform_data tsc2005_config = {
+ .ts_x_plate_ohm = 280,
+ .ts_hw_avg = 0,
+ .ts_touch_pressure = 1500,
+ .ts_stab_time = 1000,
+ .ts_pressure_max = 2048,
+ .ts_pressure_fudge = 2,
+ .ts_x_max = 4096,
+ .ts_x_fudge = 4,
+ .ts_y_max = 4096,
+ .ts_y_fudge = 7,
+
+ .esd_timeout = 8*1000, /* ms of inactivity before we check */
+
+ .set_reset = NULL,
+};
+
+static void rx51_tsc2005_set_reset(bool enable)
+{
+ gpio_set_value(RX51_TSC2005_RESET_GPIO, enable);
+}
+
+static void __init rx51_init_tsc2005(void)
+{
+ int r;
+
+ r = gpio_request(RX51_TSC2005_IRQ_GPIO, "tsc2005 DAV IRQ");
+ if (r >= 0)
+ gpio_direction_input(RX51_TSC2005_IRQ_GPIO);
+ else
+ printk(KERN_ERR "unable to get %s GPIO\n", "tsc2005 DAV IRQ");
+
+ r = gpio_request(RX51_TSC2005_RESET_GPIO, "tsc2005 reset");
+ if (r >= 0) {
+ gpio_direction_output(RX51_TSC2005_RESET_GPIO, 1);
+ tsc2005_config.set_reset = rx51_tsc2005_set_reset;
+ } else {
+ printk(KERN_ERR "unable to get %s GPIO\n", "tsc2005 reset");
+ tsc2005_config.esd_timeout = 0;
+ }
+}
+
+static struct spi_board_info rx51_peripherals_spi_board_info[] = {
+ [0] = {
+ .modalias = "tsc2005",
+ .bus_num = 1,
+ .chip_select = 0,
+ .irq = OMAP_GPIO_IRQ(RX51_TSC2005_IRQ_GPIO),
+ .max_speed_hz = 6000000,
+ .controller_data = &tsc2005_mcspi_config,
+ .platform_data = &tsc2005_config,
+ },
+};
+
#if defined(CONFIG_SMC91X) || defined(CONFIG_SMC91X_MODULE)
static struct omap_smc91x_platform_data board_smc91x_data = {
@@ -538,6 +601,9 @@ static inline void board_smc91x_init(void)
void __init rx51_peripherals_init(void)
{
+ spi_register_board_info(rx51_peripherals_spi_board_info,
+ ARRAY_SIZE(rx51_peripherals_spi_board_info));
+ rx51_init_tsc2005();
rx51_i2c_init();
board_onenand_init();
board_smc91x_init();
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 8cc453c..b758ba8 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -501,6 +501,17 @@ config TOUCHSCREEN_TOUCHIT213
To compile this driver as a module, choose M here: the
module will be called touchit213.
+config TOUCHSCREEN_TSC2005
+ tristate "TSC2005 based touchscreens"
+ depends on SPI_MASTER
+ help
+ Say Y here if you have a TSC2005 based touchscreen.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called tsc2005.
+
config TOUCHSCREEN_TSC2007
tristate "TSC2007 based touchscreens"
depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 15fa62c..0626f9f 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
+obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
new file mode 100644
index 0000000..abc0548
--- /dev/null
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -0,0 +1,958 @@
+/*
+ * TSC2005 touchscreen driver
+ *
+ * Copyright (C) 2006-2008 Nokia Corporation
+ *
+ * Author: Lauri Leukkunen <lauri.leukkunen@xxxxxxxxx>
+ * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@xxxxxxxxx>
+ *
+ * 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/interrupt.h>
+#include <linux/delay.h>
+#include <linux/spi/spi.h>
+
+#include <linux/spi/tsc2005.h>
+
+/**
+ * The touchscreen interface operates as follows:
+ *
+ * Initialize:
+ * Request access to GPIO103 (DAV)
+ * tsc2005_ts_irq_handler will trigger when DAV line goes down
+ *
+ * 1) Pen is pressed against touchscreeen
+ * 2) TSC2005 performs AD conversion
+ * 3) After the conversion is done TSC2005 drives DAV line down
+ * 4) GPIO IRQ is received and tsc2005_ts_irq_handler is called
+ * 5) tsc2005_ts_irq_handler queues up an spi transfer to fetch
+ * the x, y, z1, z2 values
+ * 6) tsc2005_ts_rx() reports coordinates to input layer and
+ * sets up tsc2005_ts_timer() to be called after TSC2005_TS_SCAN_TIME
+ * 7) When the penup_timer expires, there have not been DAV interrupts
+ * during the last 20ms which means the pen has been lifted.
+ */
+
+#define TSC2005_VDD_LOWER_27
+
+#ifdef TSC2005_VDD_LOWER_27
+#define TSC2005_HZ (10000000)
+#else
+#define TSC2005_HZ (25000000)
+#endif
+
+#define TSC2005_CMD (0x80)
+#define TSC2005_REG (0x00)
+
+#define TSC2005_CMD_STOP (1)
+#define TSC2005_CMD_10BIT (0 << 2)
+#define TSC2005_CMD_12BIT (1 << 2)
+
+#define TSC2005_CMD_SCAN_XYZZ (0 << 3)
+#define TSC2005_CMD_SCAN_XY (1 << 3)
+#define TSC2005_CMD_SCAN_X (2 << 3)
+#define TSC2005_CMD_SCAN_Y (3 << 3)
+#define TSC2005_CMD_SCAN_ZZ (4 << 3)
+#define TSC2005_CMD_AUX_SINGLE (5 << 3)
+#define TSC2005_CMD_TEMP1 (6 << 3)
+#define TSC2005_CMD_TEMP2 (7 << 3)
+#define TSC2005_CMD_AUX_CONT (8 << 3)
+#define TSC2005_CMD_TEST_X_CONN (9 << 3)
+#define TSC2005_CMD_TEST_Y_CONN (10 << 3)
+#define TSC2005_CMD_TEST_SHORT (11 << 3)
+/* command 12 reserved, according to 2008-03 erratum */
+#define TSC2005_CMD_DRIVE_XX (13 << 3)
+#define TSC2005_CMD_DRIVE_YY (14 << 3)
+#define TSC2005_CMD_DRIVE_YX (15 << 3)
+
+#define TSC2005_REG_X (0 << 3)
+#define TSC2005_REG_Y (1 << 3)
+#define TSC2005_REG_Z1 (2 << 3)
+#define TSC2005_REG_Z2 (3 << 3)
+#define TSC2005_REG_AUX (4 << 3)
+#define TSC2005_REG_TEMP1 (5 << 3)
+#define TSC2005_REG_TEMP2 (6 << 3)
+#define TSC2005_REG_STATUS (7 << 3)
+#define TSC2005_REG_AUX_HIGH (8 << 3)
+#define TSC2005_REG_AUX_LOW (9 << 3)
+#define TSC2005_REG_TEMP_HIGH (10 << 3)
+#define TSC2005_REG_TEMP_LOW (11 << 3)
+#define TSC2005_REG_CFR0 (12 << 3)
+#define TSC2005_REG_CFR1 (13 << 3)
+#define TSC2005_REG_CFR2 (14 << 3)
+#define TSC2005_REG_FUNCTION (15 << 3)
+
+#define TSC2005_REG_PND0 (1 << 1)
+#define TSC2005_REG_READ (0x01)
+#define TSC2005_REG_WRITE (0x00)
+
+
+#define TSC2005_CFR0_LONGSAMPLING (1)
+#define TSC2005_CFR0_DETECTINWAIT (1 << 1)
+#define TSC2005_CFR0_SENSETIME_32US (0)
+#define TSC2005_CFR0_SENSETIME_96US (1 << 2)
+#define TSC2005_CFR0_SENSETIME_544US (1 << 3)
+#define TSC2005_CFR0_SENSETIME_2080US (1 << 4)
+#define TSC2005_CFR0_SENSETIME_2656US (0x001C)
+#define TSC2005_CFR0_PRECHARGE_20US (0x0000)
+#define TSC2005_CFR0_PRECHARGE_84US (0x0020)
+#define TSC2005_CFR0_PRECHARGE_276US (0x0040)
+#define TSC2005_CFR0_PRECHARGE_1044US (0x0080)
+#define TSC2005_CFR0_PRECHARGE_1364US (0x00E0)
+#define TSC2005_CFR0_STABTIME_0US (0x0000)
+#define TSC2005_CFR0_STABTIME_100US (0x0100)
+#define TSC2005_CFR0_STABTIME_500US (0x0200)
+#define TSC2005_CFR0_STABTIME_1MS (0x0300)
+#define TSC2005_CFR0_STABTIME_5MS (0x0400)
+#define TSC2005_CFR0_STABTIME_100MS (0x0700)
+#define TSC2005_CFR0_CLOCK_4MHZ (0x0000)
+#define TSC2005_CFR0_CLOCK_2MHZ (0x0800)
+#define TSC2005_CFR0_CLOCK_1MHZ (0x1000)
+#define TSC2005_CFR0_RESOLUTION12 (0x2000)
+#define TSC2005_CFR0_STATUS (0x4000)
+#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 config register 0 */
+#define TSC2005_CFR0_RW_MASK 0x3fff
+
+#define TSC2005_CFR1_BATCHDELAY_0MS (0x0000)
+#define TSC2005_CFR1_BATCHDELAY_1MS (0x0001)
+#define TSC2005_CFR1_BATCHDELAY_2MS (0x0002)
+#define TSC2005_CFR1_BATCHDELAY_4MS (0x0003)
+#define TSC2005_CFR1_BATCHDELAY_10MS (0x0004)
+#define TSC2005_CFR1_BATCHDELAY_20MS (0x0005)
+#define TSC2005_CFR1_BATCHDELAY_40MS (0x0006)
+#define TSC2005_CFR1_BATCHDELAY_100MS (0x0007)
+
+#define TSC2005_CFR1_INITVALUE (TSC2005_CFR1_BATCHDELAY_4MS)
+
+#define TSC2005_CFR2_MAVE_TEMP (0x0001)
+#define TSC2005_CFR2_MAVE_AUX (0x0002)
+#define TSC2005_CFR2_MAVE_Z (0x0004)
+#define TSC2005_CFR2_MAVE_Y (0x0008)
+#define TSC2005_CFR2_MAVE_X (0x0010)
+#define TSC2005_CFR2_AVG_1 (0x0000)
+#define TSC2005_CFR2_AVG_3 (0x0400)
+#define TSC2005_CFR2_AVG_7 (0x0800)
+#define TSC2005_CFR2_MEDIUM_1 (0x0000)
+#define TSC2005_CFR2_MEDIUM_3 (0x1000)
+#define TSC2005_CFR2_MEDIUM_7 (0x2000)
+#define TSC2005_CFR2_MEDIUM_15 (0x3000)
+
+#define TSC2005_CFR2_IRQ_MASK (0xC000)
+#define TSC2005_CFR2_IRQ_DAV (0x4000)
+#define TSC2005_CFR2_IRQ_PEN (0x8000)
+#define TSC2005_CFR2_IRQ_PENDAV (0x0000)
+
+#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_IRQ_PENDAV | \
+ TSC2005_CFR2_MAVE_X | \
+ TSC2005_CFR2_MAVE_Y | \
+ TSC2005_CFR2_MAVE_Z | \
+ TSC2005_CFR2_MEDIUM_15 | \
+ TSC2005_CFR2_AVG_7)
+
+#define MAX_12BIT ((1 << 12) - 1)
+#define TS_SAMPLES 4
+#define TSC2005_TS_PENUP_TIME 40
+
+static const u32 tsc2005_read_reg[] = {
+ (TSC2005_REG | TSC2005_REG_X | TSC2005_REG_READ) << 16,
+ (TSC2005_REG | TSC2005_REG_Y | TSC2005_REG_READ) << 16,
+ (TSC2005_REG | TSC2005_REG_Z1 | TSC2005_REG_READ) << 16,
+ (TSC2005_REG | TSC2005_REG_Z2 | TSC2005_REG_READ) << 16,
+};
+#define NUM_READ_REGS (sizeof(tsc2005_read_reg)/sizeof(tsc2005_read_reg[0]))
+
+struct tsc2005 {
+ struct spi_device *spi;
+
+ struct input_dev *idev;
+ char phys[32];
+ struct timer_list penup_timer;
+
+ /* ESD recovery via a hardware reset if the tsc2005
+ * doesn't respond after a configurable period (in ms) of
+ * IRQ/SPI inactivity. If esd_timeout is 0, timer and work
+ * fields are used.
+ */
+ u32 esd_timeout;
+ struct timer_list esd_timer;
+ struct work_struct esd_work;
+
+ spinlock_t lock;
+ struct mutex mutex;
+
+ struct spi_message read_msg;
+ struct spi_transfer read_xfer[NUM_READ_REGS];
+ u32 data[NUM_READ_REGS];
+
+ /* previously reported x,y,p (if pen_down) */
+ int out_x;
+ int out_y;
+ int out_p;
+ /* fudge parameters - changes must exceed one of these. */
+ int fudge_x;
+ int fudge_y;
+ int fudge_p;
+ /* raw copy of previous x,y,z */
+ int in_x;
+ int in_y;
+ int in_z1;
+ int in_z2;
+ /* average accumulators for each component */
+ int sample_cnt;
+ int avg_x;
+ int avg_y;
+ int avg_z1;
+ int avg_z2;
+ /* configuration */
+ int x_plate_ohm;
+ int hw_avg_max;
+ int stab_time;
+ int p_max;
+ int touch_pressure;
+ /* status */
+ u8 sample_sent;
+ u8 pen_down;
+ u8 disabled;
+ u8 disable_depth;
+ u8 spi_pending;
+
+ void (*set_reset)(bool enable);
+};
+
+static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
+{
+ u8 data = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
+ struct spi_message msg;
+ struct spi_transfer xfer = { 0 };
+
+ xfer.tx_buf = &data;
+ xfer.rx_buf = NULL;
+ xfer.len = 1;
+ xfer.bits_per_word = 8;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ spi_sync(ts->spi, &msg);
+}
+
+static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
+{
+ u32 tx;
+ struct spi_message msg;
+ struct spi_transfer xfer = { 0 };
+
+ tx = (TSC2005_REG | reg | TSC2005_REG_PND0 |
+ TSC2005_REG_WRITE) << 16;
+ tx |= value;
+
+ xfer.tx_buf = &tx;
+ xfer.rx_buf = NULL;
+ xfer.len = 4;
+ xfer.bits_per_word = 24;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ spi_sync(ts->spi, &msg);
+}
+
+static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
+{
+ u32 tx;
+ u32 rx = 0;
+ struct spi_message msg;
+ struct spi_transfer xfer = { 0 };
+
+ tx = (TSC2005_REG | reg | TSC2005_REG_READ) << 16;
+
+ xfer.tx_buf = &tx;
+ xfer.rx_buf = ℞
+ xfer.len = 4;
+ xfer.bits_per_word = 24;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+ spi_sync(ts->spi, &msg);
+ *value = rx;
+}
+
+static void tsc2005_ts_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, 1);
+ ts->pen_down = 1;
+ }
+ } else {
+ input_report_abs(ts->idev, ABS_PRESSURE, 0);
+ if (ts->pen_down) {
+ input_report_key(ts->idev, BTN_TOUCH, 0);
+ ts->pen_down = 0;
+ }
+ }
+
+ input_sync(ts->idev);
+}
+
+/*
+ * This function is called by the SPI framework after the coordinates
+ * have been read from TSC2005
+ */
+static void tsc2005_ts_rx(void *arg)
+{
+ struct tsc2005 *ts = arg;
+ unsigned long flags;
+ int inside_rect, pressure_limit;
+ int x, y, z1, z2, pressure;
+
+ spin_lock_irqsave(&ts->lock, flags);
+
+ if (ts->disable_depth) {
+ ts->spi_pending = 0;
+ goto out;
+ }
+
+ x = ts->data[0];
+ y = ts->data[1];
+ z1 = ts->data[2];
+ z2 = ts->data[3];
+
+ /* validate pressure and position */
+ if (x > MAX_12BIT || y > MAX_12BIT)
+ goto out;
+
+ /* skip coords if the pressure-components are out of range */
+ if (z1 < 100 || 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;
+
+ /* don't run average on the "pen down" event */
+ if (ts->sample_sent) {
+ ts->avg_x += x;
+ ts->avg_y += y;
+ ts->avg_z1 += z1;
+ ts->avg_z2 += z2;
+
+ if (++ts->sample_cnt < TS_SAMPLES)
+ goto out;
+
+ x = ts->avg_x / TS_SAMPLES;
+ y = ts->avg_y / TS_SAMPLES;
+ z1 = ts->avg_z1 / TS_SAMPLES;
+ z2 = ts->avg_z2 / TS_SAMPLES;
+ }
+
+ ts->sample_cnt = 0;
+ ts->avg_x = 0;
+ ts->avg_y = 0;
+ ts->avg_z1 = 0;
+ ts->avg_z2 = 0;
+
+ pressure = x * (z2 - z1) / z1;
+ pressure = pressure * ts->x_plate_ohm / 4096;
+
+ pressure_limit = ts->sample_sent ? ts->p_max : ts->touch_pressure;
+ if (pressure > pressure_limit)
+ goto out;
+
+ /* Discard the event if it still is within the previous rect -
+ * unless the pressure is clearly harder, but then use previous
+ * x,y position. If any coordinate deviates enough, fudging
+ * of all three will still take place in the input layer.
+ */
+ inside_rect = (ts->sample_sent &&
+ x > (int)ts->out_x - ts->fudge_x &&
+ x < (int)ts->out_x + ts->fudge_x &&
+ y > (int)ts->out_y - ts->fudge_y &&
+ y < (int)ts->out_y + ts->fudge_y);
+ if (inside_rect)
+ x = ts->out_x, y = ts->out_y;
+
+ if (!inside_rect || pressure < (ts->out_p - ts->fudge_p)) {
+ tsc2005_ts_update_pen_state(ts, x, y, pressure);
+ ts->sample_sent = 1;
+ ts->out_x = x;
+ ts->out_y = y;
+ ts->out_p = pressure;
+ }
+out:
+ if (ts->spi_pending > 1) {
+ /* One or more interrupts (sometimes several dozens)
+ * occured while waiting for the SPI read - get
+ * another read going.
+ */
+ ts->spi_pending = 1;
+ if (spi_async(ts->spi, &ts->read_msg)) {
+ dev_err(&ts->spi->dev, "ts: spi_async() failed");
+ ts->spi_pending = 0;
+ }
+ } else
+ ts->spi_pending = 0;
+
+ /* kick pen up timer - to make sure it expires again(!) */
+ if (ts->sample_sent) {
+ mod_timer(&ts->penup_timer,
+ jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME));
+ /* Also kick the watchdog, as we still think we're alive */
+ if (ts->esd_timeout && ts->disable_depth == 0) {
+ unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
+ mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
+ }
+ }
+ spin_unlock_irqrestore(&ts->lock, flags);
+}
+
+/* This penup timer is very forgiving of delayed SPI reads. The
+ * (ESD) watchdog will rescue us if spi_pending remains set, unless
+ * we are enterring the disabled state. In that case we must just
+ * handle the pen up, and let disabling complete.
+ */
+static void tsc2005_ts_penup_timer_handler(unsigned long data)
+{
+ struct tsc2005 *ts = (struct tsc2005 *)data;
+ if ((!ts->spi_pending || ts->disable_depth) &&
+ ts->sample_sent) {
+ tsc2005_ts_update_pen_state(ts, 0, 0, 0);
+ ts->sample_sent = 0;
+ }
+}
+
+/*
+ * This interrupt is called when pen is down and coordinates are
+ * available. That is indicated by a either:
+ * a) a rising edge on PINTDAV or (PENDAV mode)
+ * b) a falling edge on DAV line (DAV mode)
+ * depending on the setting of the IRQ bits in the CFR2 setting above.
+ */
+static irqreturn_t tsc2005_ts_irq_handler(int irq, void *dev_id)
+{
+ struct tsc2005 *ts = dev_id;
+ if (ts->disable_depth)
+ goto out;
+
+ if (!ts->spi_pending) {
+ if (spi_async(ts->spi, &ts->read_msg)) {
+ dev_err(&ts->spi->dev, "ts: spi_async() failed");
+ goto out;
+ }
+ }
+ /* By shifting in 1s we can never wrap */
+ ts->spi_pending = (ts->spi_pending<<1)+1;
+
+ /* Kick pen up timer only if it's not been started yet. Strictly,
+ * it isn't even necessary to start it at all here, but doing so
+ * keeps an equivalence between pen state and timer state.
+ * The SPI read loop will keep pushing it into the future.
+ * If it times out with an SPI pending, it's ignored anyway.
+ */
+ if (!timer_pending(&ts->penup_timer)) {
+ unsigned long pu = msecs_to_jiffies(TSC2005_TS_PENUP_TIME);
+ ts->penup_timer.expires = jiffies + pu;
+ add_timer(&ts->penup_timer);
+ }
+out:
+ return IRQ_HANDLED;
+}
+
+static void tsc2005_ts_setup_spi_xfer(struct tsc2005 *ts)
+{
+ struct spi_message *m = &ts->read_msg;
+ struct spi_transfer *x = &ts->read_xfer[0];
+ int i;
+
+ spi_message_init(m);
+
+ for (i = 0; i < NUM_READ_REGS; i++, x++) {
+ x->tx_buf = &tsc2005_read_reg[i];
+ x->rx_buf = &ts->data[i];
+ x->len = 4;
+ x->bits_per_word = 24;
+ x->cs_change = i < (NUM_READ_REGS - 1);
+ spi_message_add_tail(x, m);
+ }
+
+ m->complete = tsc2005_ts_rx;
+ m->context = ts;
+}
+
+static ssize_t tsc2005_ts_pen_down_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tsc2005 *ts = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", ts->pen_down);
+}
+
+static DEVICE_ATTR(pen_down, S_IRUGO, tsc2005_ts_pen_down_show, NULL);
+
+static int tsc2005_configure(struct tsc2005 *ts, int flags)
+{
+ 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, flags);
+
+ return 0;
+}
+
+static void tsc2005_start_scan(struct tsc2005 *ts)
+{
+ tsc2005_configure(ts, TSC2005_CMD_SCAN_XYZZ);
+}
+
+static void tsc2005_stop_scan(struct tsc2005 *ts)
+{
+ tsc2005_cmd(ts, TSC2005_CMD_STOP);
+}
+
+/* Must be called with mutex held */
+static void tsc2005_disable(struct tsc2005 *ts)
+{
+ if (ts->disable_depth++ != 0)
+ return;
+
+ disable_irq(ts->spi->irq);
+ if (ts->esd_timeout)
+ del_timer(&ts->esd_timer);
+
+ /* wait until penup timer expire normally */
+ do {
+ msleep(4);
+ } while (ts->sample_sent);
+
+ tsc2005_stop_scan(ts);
+}
+
+static void tsc2005_enable(struct tsc2005 *ts)
+{
+ if (ts->disable_depth != 1)
+ goto out;
+
+ if (ts->esd_timeout) {
+ unsigned long wdj = msecs_to_jiffies(ts->esd_timeout);
+ ts->esd_timer.expires = round_jiffies(jiffies+wdj);
+ add_timer(&ts->esd_timer);
+ }
+ tsc2005_start_scan(ts);
+ enable_irq(ts->spi->irq);
+out:
+ --ts->disable_depth;
+}
+
+static ssize_t tsc2005_disable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct tsc2005 *ts = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", ts->disabled);
+}
+
+static ssize_t tsc2005_disable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct tsc2005 *ts = dev_get_drvdata(dev);
+ unsigned long res;
+ int i;
+
+ if (strict_strtoul(buf, 10, &res) < 0)
+ return -EINVAL;
+ i = res ? 1 : 0;
+
+ mutex_lock(&ts->mutex);
+ if (i == ts->disabled)
+ goto out;
+ ts->disabled = i;
+
+ if (i)
+ tsc2005_disable(ts);
+ else
+ tsc2005_enable(ts);
+out:
+ mutex_unlock(&ts->mutex);
+ return count;
+}
+
+static DEVICE_ATTR(disable_ts, 0664, tsc2005_disable_show,
+ tsc2005_disable_store);
+
+static ssize_t tsc2005_ctrl_selftest_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ u16 temp_high_orig, temp_high_test, temp_high;
+ unsigned int result = 1;
+ struct tsc2005 *ts = dev_get_drvdata(dev);
+
+ if (!ts->set_reset) {
+ dev_warn(&ts->spi->dev,
+ "unable to selftest: reset not configured\n");
+ result = 0;
+ goto out;
+ }
+
+ mutex_lock(&ts->mutex);
+ tsc2005_disable(ts);
+
+ /* Test ctrl communications via temp high / low registers */
+ tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
+
+ temp_high_test = (temp_high_orig - 1) & 0x0FFF;
+
+ tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
+
+ tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
+
+ if (temp_high != temp_high_test) {
+ result = 0;
+ dev_warn(dev, "selftest failed: %d != %d\n",
+ temp_high, temp_high_test);
+ }
+
+ /* HW Reset */
+ ts->set_reset(0);
+ msleep(1); /* only 10us required */
+ ts->set_reset(1);
+
+ tsc2005_enable(ts);
+
+ /* Test that reset really happened */
+ tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
+
+ if (temp_high != temp_high_orig) {
+ result = 0;
+ dev_warn(dev, "selftest failed after reset: "
+ "%d != %d\n",
+ temp_high, temp_high_orig);
+ }
+
+ mutex_unlock(&ts->mutex);
+
+out:
+ return sprintf(buf, "%u\n", result);
+}
+
+static DEVICE_ATTR(ts_ctrl_selftest, S_IRUGO, tsc2005_ctrl_selftest_show, NULL);
+
+static void tsc2005_esd_timer_handler(unsigned long data)
+{
+ struct tsc2005 *ts = (struct tsc2005 *)data;
+ if (!ts->disable_depth)
+ schedule_work(&ts->esd_work);
+}
+
+static void tsc2005_rst_handler(struct work_struct *work)
+{
+ u16 reg_val;
+ struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
+ unsigned long wdj;
+
+ mutex_lock(&ts->mutex);
+
+ /* If we are disabled, or the a touch has been detected,
+ * then ignore this timeout. The enable will restart the
+ * watchdog, as it restarts scanning
+ */
+ if (ts->disable_depth)
+ goto out;
+
+ /* If we cannot read our known value from configuration register 0
+ * then reset the controller as if from power-up and start
+ * scanning again. Always re-arm the watchdog.
+ */
+ tsc2005_read(ts, TSC2005_REG_CFR0, ®_val);
+ if ((reg_val ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
+ dev_info(&ts->spi->dev, "TSC not responding, resetting.\n");
+ /* If this timer kicked in, the penup timer, if ever active
+ * at all, must have expired ages ago, so no need to del it.
+ */
+ ts->set_reset(0);
+ if (ts->sample_sent) {
+ tsc2005_ts_update_pen_state(ts, 0, 0, 0);
+ ts->sample_sent = 0;
+ }
+ ts->spi_pending = 0;
+ msleep(1); /* only 10us required */
+ ts->set_reset(1);
+ tsc2005_start_scan(ts);
+ }
+ wdj = msecs_to_jiffies(ts->esd_timeout);
+ mod_timer(&ts->esd_timer, round_jiffies(jiffies+wdj));
+
+out:
+ mutex_unlock(&ts->mutex);
+}
+
+static int __devinit tsc2005_ts_init(struct tsc2005 *ts,
+ struct tsc2005_platform_data *pdata)
+{
+ struct input_dev *idev;
+ int r;
+ int x_max, y_max;
+
+ init_timer(&ts->penup_timer);
+ setup_timer(&ts->penup_timer, tsc2005_ts_penup_timer_handler,
+ (unsigned long)ts);
+
+ spin_lock_init(&ts->lock);
+ mutex_init(&ts->mutex);
+
+ ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
+ ts->hw_avg_max = pdata->ts_hw_avg;
+ ts->stab_time = pdata->ts_stab_time;
+ x_max = pdata->ts_x_max ? : 4096;
+ ts->fudge_x = pdata->ts_x_fudge ? : 4;
+ y_max = pdata->ts_y_max ? : 4096;
+ ts->fudge_y = pdata->ts_y_fudge ? : 8;
+ ts->p_max = pdata->ts_pressure_max ? : MAX_12BIT;
+ ts->touch_pressure = pdata->ts_touch_pressure ? : ts->p_max;
+ ts->fudge_p = pdata->ts_pressure_fudge ? : 2;
+
+ ts->set_reset = pdata->set_reset;
+
+ idev = input_allocate_device();
+ if (idev == NULL) {
+ r = -ENOMEM;
+ goto err1;
+ }
+
+ idev->name = "TSC2005 touchscreen";
+ snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
+ dev_name(&ts->spi->dev));
+ idev->phys = ts->phys;
+
+ idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
+ idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
+ idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+ ts->idev = idev;
+
+ tsc2005_ts_setup_spi_xfer(ts);
+
+ input_set_abs_params(idev, ABS_X, 0, x_max, ts->fudge_x, 0);
+ input_set_abs_params(idev, ABS_Y, 0, y_max, ts->fudge_y, 0);
+ input_set_abs_params(idev, ABS_PRESSURE, 0, ts->p_max, ts->fudge_p, 0);
+
+ tsc2005_start_scan(ts);
+
+ r = request_irq(ts->spi->irq, tsc2005_ts_irq_handler,
+ (((TSC2005_CFR2_INITVALUE & TSC2005_CFR2_IRQ_MASK) ==
+ TSC2005_CFR2_IRQ_PENDAV)
+ ? IRQF_TRIGGER_RISING
+ : IRQF_TRIGGER_FALLING) |
+ IRQF_DISABLED, "tsc2005", ts);
+ if (r < 0) {
+ dev_err(&ts->spi->dev, "unable to get DAV IRQ");
+ goto err2;
+ }
+
+ set_irq_wake(ts->spi->irq, 1);
+
+ r = input_register_device(idev);
+ if (r < 0) {
+ dev_err(&ts->spi->dev, "can't register touchscreen device\n");
+ goto err3;
+ }
+
+ /* We can tolerate these failing */
+ r = device_create_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
+ if (r < 0)
+ dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
+ dev_attr_ts_ctrl_selftest.attr.name, r);
+
+ r = device_create_file(&ts->spi->dev, &dev_attr_pen_down);
+ if (r < 0)
+ dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
+ dev_attr_pen_down.attr.name, r);
+
+ r = device_create_file(&ts->spi->dev, &dev_attr_disable_ts);
+ if (r < 0)
+ dev_warn(&ts->spi->dev, "can't create sysfs file for %s: %d\n",
+ dev_attr_disable_ts.attr.name, r);
+
+ /* Finally, configure and start the optional EDD watchdog. */
+ ts->esd_timeout = pdata->esd_timeout;
+ if (ts->esd_timeout && ts->set_reset) {
+ unsigned long wdj;
+ setup_timer(&ts->esd_timer, tsc2005_esd_timer_handler,
+ (unsigned long)ts);
+ INIT_WORK(&ts->esd_work, tsc2005_rst_handler);
+ wdj = msecs_to_jiffies(ts->esd_timeout);
+ ts->esd_timer.expires = round_jiffies(jiffies+wdj);
+ add_timer(&ts->esd_timer);
+ }
+
+ return 0;
+err3:
+ free_irq(ts->spi->irq, ts);
+err2:
+ tsc2005_stop_scan(ts);
+ input_free_device(idev);
+err1:
+ return r;
+}
+
+static int __devinit tsc2005_probe(struct spi_device *spi)
+{
+ struct tsc2005 *ts;
+ struct tsc2005_platform_data *pdata = spi->dev.platform_data;
+ int r;
+
+ if (spi->irq < 0) {
+ dev_dbg(&spi->dev, "no irq?\n");
+ return -ENODEV;
+ }
+ if (!pdata) {
+ dev_dbg(&spi->dev, "no platform data?\n");
+ return -ENODEV;
+ }
+
+ ts = kzalloc(sizeof(*ts), GFP_KERNEL);
+ if (ts == NULL)
+ return -ENOMEM;
+
+ dev_set_drvdata(&spi->dev, ts);
+ ts->spi = spi;
+ spi->dev.power.power_state = PMSG_ON;
+
+ spi->mode = SPI_MODE_0;
+ spi->bits_per_word = 8;
+ /* The max speed might've been defined by the board-specific
+ * struct */
+ if (!spi->max_speed_hz)
+ spi->max_speed_hz = TSC2005_HZ;
+
+ spi_setup(spi);
+
+ r = tsc2005_ts_init(ts, pdata);
+ if (r)
+ goto err1;
+
+ return 0;
+
+err1:
+ kfree(ts);
+ return r;
+}
+
+static int __devexit tsc2005_remove(struct spi_device *spi)
+{
+ struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
+
+ mutex_lock(&ts->mutex);
+ tsc2005_disable(ts);
+ mutex_unlock(&ts->mutex);
+
+ device_remove_file(&ts->spi->dev, &dev_attr_disable_ts);
+ device_remove_file(&ts->spi->dev, &dev_attr_pen_down);
+ device_remove_file(&ts->spi->dev, &dev_attr_ts_ctrl_selftest);
+
+ free_irq(ts->spi->irq, ts);
+ input_unregister_device(ts->idev);
+
+ if (ts->esd_timeout)
+ del_timer(&ts->esd_timer);
+ kfree(ts);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg)
+{
+ struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
+
+ mutex_lock(&ts->mutex);
+ tsc2005_disable(ts);
+ mutex_unlock(&ts->mutex);
+
+ return 0;
+}
+
+static int tsc2005_resume(struct spi_device *spi)
+{
+ struct tsc2005 *ts = dev_get_drvdata(&spi->dev);
+
+ mutex_lock(&ts->mutex);
+ tsc2005_enable(ts);
+ mutex_unlock(&ts->mutex);
+
+ return 0;
+}
+#endif
+
+static struct spi_driver tsc2005_driver = {
+ .driver = {
+ .name = "tsc2005",
+ .owner = THIS_MODULE,
+ },
+#ifdef CONFIG_PM
+ .suspend = tsc2005_suspend,
+ .resume = tsc2005_resume,
+#endif
+ .probe = tsc2005_probe,
+ .remove = __devexit_p(tsc2005_remove),
+};
+
+static int __init tsc2005_init(void)
+{
+ printk(KERN_INFO "TSC2005 driver initializing\n");
+
+ return spi_register_driver(&tsc2005_driver);
+}
+module_init(tsc2005_init);
+
+static void __exit tsc2005_exit(void)
+{
+ spi_unregister_driver(&tsc2005_driver);
+}
+module_exit(tsc2005_exit);
+
+MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@xxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:tsc2005");
diff --git a/include/linux/spi/tsc2005.h b/include/linux/spi/tsc2005.h
new file mode 100644
index 0000000..1a60c90
--- /dev/null
+++ b/include/linux/spi/tsc2005.h
@@ -0,0 +1,30 @@
+#ifndef _LINUX_SPI_TSC2005_H
+#define _LINUX_SPI_TSC2005_H
+
+#include <linux/types.h>
+
+struct tsc2005_platform_data {
+ u16 ts_x_plate_ohm;
+ u32 ts_stab_time; /* voltage settling time */
+ u8 ts_hw_avg; /* HW assiseted averaging. Can be
+ 0, 4, 8, 16 samples per reading */
+ u32 ts_touch_pressure; /* Pressure limit until we report a
+ touch event. After that we switch
+ to ts_max_pressure. */
+ u32 ts_pressure_max;/* Samples with bigger pressure value will
+ be ignored, since the corresponding X, Y
+ values are unreliable */
+ u32 ts_pressure_fudge;
+ u32 ts_x_max;
+ u32 ts_x_fudge;
+ u32 ts_y_max;
+ u32 ts_y_fudge;
+
+ u32 esd_timeout; /* msec of inactivity before we check */
+
+ unsigned ts_ignore_last:1;
+
+ void (*set_reset)(bool enable);
+};
+
+#endif
--
1.6.0.4
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