Input: introduce tsc2005 driver
Discussions: http://www.mail-archive.com/linux-omap@vger.kernel.org/msg26748.html Introduce a driver for the Texas Instruments TSC2005 touchscreen controller (http://focus.ti.com/docs/prod/folders/print/tsc2005.html). The patch is based on a driver by Lauri Leukkunen, with 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@nokia.com> [aaro.koskinen@nokia.com: patch description, rebasing & cleanup] Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com> [ext-srikar.1.bhavanarayana@nokia.com: various fixes] Signed-off-by: Srikar <ext-srikar.1.bhavanarayana@nokia.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Lauri Leukkunen
Dmitry Torokhov
parent
3c0eee3fe6
commit
37bd44694c
4 changed files with 766 additions and 0 deletions
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@ -629,6 +629,17 @@ config TOUCHSCREEN_TOUCHIT213
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To compile this driver as a module, choose M here: the
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module will be called touchit213.
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config TOUCHSCREEN_TSC2005
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tristate "TSC2005 based touchscreens"
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depends on SPI_MASTER
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help
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Say Y here if you have a TSC2005 based touchscreen.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called tsc2005.
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config TOUCHSCREEN_TSC2007
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tristate "TSC2007 based touchscreens"
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depends on I2C
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@ -44,6 +44,7 @@ obj-$(CONFIG_TOUCHSCREEN_TNETV107X) += tnetv107x-ts.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
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obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
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obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
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obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
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obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
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713
drivers/input/touchscreen/tsc2005.c
Normal file
713
drivers/input/touchscreen/tsc2005.c
Normal file
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@ -0,0 +1,713 @@
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/*
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* TSC2005 touchscreen driver
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*
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* Copyright (C) 2006-2010 Nokia Corporation
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*
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* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
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* based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/tsc2005.h>
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/*
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* The touchscreen interface operates as follows:
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*
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* 1) Pen is pressed against the touchscreen.
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* 2) TSC2005 performs AD conversion.
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* 3) After the conversion is done TSC2005 drives DAV line down.
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* 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
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* 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
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* values.
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* 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
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* tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
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* 7) When the penup timer expires, there have not been touch or DAV interrupts
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* during the last 40ms which means the pen has been lifted.
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*
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* ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
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* after a configurable period (in ms) of activity. If esd_timeout is 0, the
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* watchdog is disabled.
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*/
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/* control byte 1 */
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#define TSC2005_CMD 0x80
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#define TSC2005_CMD_NORMAL 0x00
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#define TSC2005_CMD_STOP 0x01
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#define TSC2005_CMD_12BIT 0x04
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/* control byte 0 */
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#define TSC2005_REG_READ 0x0001
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#define TSC2005_REG_PND0 0x0002
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#define TSC2005_REG_X 0x0000
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#define TSC2005_REG_Y 0x0008
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#define TSC2005_REG_Z1 0x0010
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#define TSC2005_REG_Z2 0x0018
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#define TSC2005_REG_TEMP_HIGH 0x0050
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#define TSC2005_REG_CFR0 0x0060
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#define TSC2005_REG_CFR1 0x0068
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#define TSC2005_REG_CFR2 0x0070
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/* configuration register 0 */
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#define TSC2005_CFR0_PRECHARGE_276US 0x0040
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#define TSC2005_CFR0_STABTIME_1MS 0x0300
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#define TSC2005_CFR0_CLOCK_1MHZ 0x1000
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#define TSC2005_CFR0_RESOLUTION12 0x2000
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#define TSC2005_CFR0_PENMODE 0x8000
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#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \
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TSC2005_CFR0_CLOCK_1MHZ | \
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TSC2005_CFR0_RESOLUTION12 | \
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TSC2005_CFR0_PRECHARGE_276US | \
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TSC2005_CFR0_PENMODE)
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/* bits common to both read and write of configuration register 0 */
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#define TSC2005_CFR0_RW_MASK 0x3fff
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/* configuration register 1 */
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#define TSC2005_CFR1_BATCHDELAY_4MS 0x0003
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#define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS
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/* configuration register 2 */
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#define TSC2005_CFR2_MAVE_Z 0x0004
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#define TSC2005_CFR2_MAVE_Y 0x0008
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#define TSC2005_CFR2_MAVE_X 0x0010
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#define TSC2005_CFR2_AVG_7 0x0800
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#define TSC2005_CFR2_MEDIUM_15 0x3000
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#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \
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TSC2005_CFR2_MAVE_Y | \
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TSC2005_CFR2_MAVE_Z | \
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TSC2005_CFR2_MEDIUM_15 | \
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TSC2005_CFR2_AVG_7)
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#define MAX_12BIT 0xfff
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#define TSC2005_SPI_MAX_SPEED_HZ 10000000
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#define TSC2005_PENUP_TIME_MS 40
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struct tsc2005_spi_rd {
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struct spi_transfer spi_xfer;
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u32 spi_tx;
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u32 spi_rx;
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};
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struct tsc2005 {
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struct spi_device *spi;
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struct spi_message spi_read_msg;
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struct tsc2005_spi_rd spi_x;
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struct tsc2005_spi_rd spi_y;
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struct tsc2005_spi_rd spi_z1;
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struct tsc2005_spi_rd spi_z2;
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struct input_dev *idev;
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char phys[32];
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struct mutex mutex;
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/* raw copy of previous x,y,z */
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int in_x;
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int in_y;
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int in_z1;
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int in_z2;
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struct timer_list penup_timer;
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struct work_struct penup_work;
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unsigned int esd_timeout;
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struct timer_list esd_timer;
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struct work_struct esd_work;
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unsigned int x_plate_ohm;
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bool disabled;
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unsigned int disable_depth;
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unsigned int pen_down;
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void (*set_reset)(bool enable);
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};
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static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
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{
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u8 tx;
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struct spi_message msg;
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struct spi_transfer xfer = { 0 };
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tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
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xfer.tx_buf = &tx;
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xfer.rx_buf = NULL;
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xfer.len = 1;
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xfer.bits_per_word = 8;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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spi_sync(ts->spi, &msg);
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}
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static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
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{
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u32 tx;
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struct spi_message msg;
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struct spi_transfer xfer = { 0 };
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tx = (reg | TSC2005_REG_PND0) << 16;
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tx |= value;
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xfer.tx_buf = &tx;
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xfer.rx_buf = NULL;
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xfer.len = 4;
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xfer.bits_per_word = 24;
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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spi_sync(ts->spi, &msg);
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}
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static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
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{
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rd->spi_tx = (reg | TSC2005_REG_READ) << 16;
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rd->spi_xfer.tx_buf = &rd->spi_tx;
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rd->spi_xfer.rx_buf = &rd->spi_rx;
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rd->spi_xfer.len = 4;
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rd->spi_xfer.bits_per_word = 24;
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rd->spi_xfer.cs_change = !last;
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}
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static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
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{
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struct spi_message msg;
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struct tsc2005_spi_rd spi_rd = { { 0 }, 0, 0 };
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tsc2005_setup_read(&spi_rd, reg, 1);
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spi_message_init(&msg);
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spi_message_add_tail(&spi_rd.spi_xfer, &msg);
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spi_sync(ts->spi, &msg);
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*value = spi_rd.spi_rx;
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}
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static void tsc2005_update_pen_state(struct tsc2005 *ts,
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int x, int y, int pressure)
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{
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if (pressure) {
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input_report_abs(ts->idev, ABS_X, x);
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input_report_abs(ts->idev, ABS_Y, y);
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input_report_abs(ts->idev, ABS_PRESSURE, pressure);
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if (!ts->pen_down) {
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input_report_key(ts->idev, BTN_TOUCH, !!pressure);
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ts->pen_down = 1;
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}
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} else {
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input_report_abs(ts->idev, ABS_PRESSURE, 0);
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if (ts->pen_down) {
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input_report_key(ts->idev, BTN_TOUCH, 0);
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ts->pen_down = 0;
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}
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}
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input_sync(ts->idev);
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dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
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pressure);
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}
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static irqreturn_t tsc2005_irq_handler(int irq, void *dev_id)
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{
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struct tsc2005 *ts = dev_id;
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/* update the penup timer only if it's pending */
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mod_timer_pending(&ts->penup_timer,
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jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
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return IRQ_WAKE_THREAD;
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}
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static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
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{
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struct tsc2005 *ts = _ts;
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unsigned int pressure;
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u32 x;
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u32 y;
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u32 z1;
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u32 z2;
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mutex_lock(&ts->mutex);
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if (unlikely(ts->disable_depth))
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goto out;
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/* read the coordinates */
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spi_sync(ts->spi, &ts->spi_read_msg);
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x = ts->spi_x.spi_rx;
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y = ts->spi_y.spi_rx;
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z1 = ts->spi_z1.spi_rx;
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z2 = ts->spi_z2.spi_rx;
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/* validate position */
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if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
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goto out;
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/* skip coords if the pressure components are out of range */
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if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
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goto out;
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/* skip point if this is a pen down with the exact same values as
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* the value before pen-up - that implies SPI fed us stale data
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*/
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if (!ts->pen_down &&
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ts->in_x == x &&
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ts->in_y == y &&
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ts->in_z1 == z1 &&
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ts->in_z2 == z2)
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goto out;
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/* At this point we are happy we have a valid and useful reading.
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* Remember it for later comparisons. We may now begin downsampling
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*/
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ts->in_x = x;
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ts->in_y = y;
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ts->in_z1 = z1;
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ts->in_z2 = z2;
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/* compute touch pressure resistance using equation #1 */
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pressure = x * (z2 - z1) / z1;
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pressure = pressure * ts->x_plate_ohm / 4096;
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if (unlikely(pressure > MAX_12BIT))
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goto out;
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tsc2005_update_pen_state(ts, x, y, pressure);
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/* set the penup timer */
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mod_timer(&ts->penup_timer,
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jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
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if (!ts->esd_timeout)
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goto out;
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/* update the watchdog timer */
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mod_timer(&ts->esd_timer,
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round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
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out:
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mutex_unlock(&ts->mutex);
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return IRQ_HANDLED;
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}
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static void tsc2005_penup_timer(unsigned long data)
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{
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struct tsc2005 *ts = (struct tsc2005 *)data;
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schedule_work(&ts->penup_work);
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}
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static void tsc2005_penup_work(struct work_struct *work)
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{
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struct tsc2005 *ts = container_of(work, struct tsc2005, penup_work);
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mutex_lock(&ts->mutex);
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tsc2005_update_pen_state(ts, 0, 0, 0);
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mutex_unlock(&ts->mutex);
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}
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static void tsc2005_start_scan(struct tsc2005 *ts)
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{
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tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
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tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
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tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
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tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
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}
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static void tsc2005_stop_scan(struct tsc2005 *ts)
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{
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tsc2005_cmd(ts, TSC2005_CMD_STOP);
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}
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/* must be called with mutex held */
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static void tsc2005_disable(struct tsc2005 *ts)
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{
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if (ts->disable_depth++ != 0)
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return;
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disable_irq(ts->spi->irq);
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if (ts->esd_timeout)
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del_timer_sync(&ts->esd_timer);
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del_timer_sync(&ts->penup_timer);
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tsc2005_stop_scan(ts);
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}
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/* must be called with mutex held */
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static void tsc2005_enable(struct tsc2005 *ts)
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{
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if (--ts->disable_depth != 0)
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return;
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tsc2005_start_scan(ts);
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enable_irq(ts->spi->irq);
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if (!ts->esd_timeout)
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return;
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mod_timer(&ts->esd_timer,
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round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
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}
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static ssize_t tsc2005_disable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct tsc2005 *ts = dev_get_drvdata(dev);
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return sprintf(buf, "%u\n", ts->disabled);
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}
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static ssize_t tsc2005_disable_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct tsc2005 *ts = dev_get_drvdata(dev);
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unsigned long res;
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int i;
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if (strict_strtoul(buf, 10, &res) < 0)
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return -EINVAL;
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i = res ? 1 : 0;
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mutex_lock(&ts->mutex);
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if (i == ts->disabled)
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goto out;
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ts->disabled = i;
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if (i)
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tsc2005_disable(ts);
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else
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tsc2005_enable(ts);
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out:
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mutex_unlock(&ts->mutex);
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return count;
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}
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static DEVICE_ATTR(disable, 0664, tsc2005_disable_show, tsc2005_disable_store);
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static ssize_t tsc2005_selftest_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct tsc2005 *ts = dev_get_drvdata(dev);
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u16 temp_high;
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u16 temp_high_orig;
|
||||
u16 temp_high_test;
|
||||
unsigned int result;
|
||||
|
||||
if (!ts->set_reset) {
|
||||
dev_warn(&ts->spi->dev,
|
||||
"unable to selftest: no reset function\n");
|
||||
result = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
mutex_lock(&ts->mutex);
|
||||
|
||||
/*
|
||||
* Test TSC2005 communications via temp high register.
|
||||
*/
|
||||
tsc2005_disable(ts);
|
||||
result = 1;
|
||||
tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
|
||||
temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
|
||||
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) {
|
||||
dev_warn(dev, "selftest failed: %d != %d\n",
|
||||
temp_high, temp_high_test);
|
||||
result = 0;
|
||||
}
|
||||
|
||||
/* hardware reset */
|
||||
ts->set_reset(0);
|
||||
usleep_range(100, 500); /* only 10us required */
|
||||
ts->set_reset(1);
|
||||
tsc2005_enable(ts);
|
||||
|
||||
/* test that the reset really happened */
|
||||
tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
|
||||
if (temp_high != temp_high_orig) {
|
||||
dev_warn(dev, "selftest failed after reset: %d != %d\n",
|
||||
temp_high, temp_high_orig);
|
||||
result = 0;
|
||||
}
|
||||
|
||||
mutex_unlock(&ts->mutex);
|
||||
|
||||
out:
|
||||
return sprintf(buf, "%u\n", result);
|
||||
}
|
||||
static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
|
||||
|
||||
static void tsc2005_esd_timer(unsigned long data)
|
||||
{
|
||||
struct tsc2005 *ts = (struct tsc2005 *)data;
|
||||
|
||||
schedule_work(&ts->esd_work);
|
||||
}
|
||||
|
||||
static void tsc2005_esd_work(struct work_struct *work)
|
||||
{
|
||||
struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
|
||||
u16 r;
|
||||
|
||||
mutex_lock(&ts->mutex);
|
||||
|
||||
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.
|
||||
*/
|
||||
tsc2005_read(ts, TSC2005_REG_CFR0, &r);
|
||||
if ((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
|
||||
dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
|
||||
ts->set_reset(0);
|
||||
tsc2005_update_pen_state(ts, 0, 0, 0);
|
||||
usleep_range(100, 500); /* only 10us required */
|
||||
ts->set_reset(1);
|
||||
tsc2005_start_scan(ts);
|
||||
}
|
||||
|
||||
/* re-arm the watchdog */
|
||||
mod_timer(&ts->esd_timer,
|
||||
round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
|
||||
|
||||
out:
|
||||
mutex_unlock(&ts->mutex);
|
||||
}
|
||||
|
||||
static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
|
||||
{
|
||||
tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, 0);
|
||||
tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, 0);
|
||||
tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, 0);
|
||||
tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, 1);
|
||||
|
||||
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 struct attribute *tsc2005_attrs[] = {
|
||||
&dev_attr_disable.attr,
|
||||
&dev_attr_selftest.attr,
|
||||
NULL
|
||||
};
|
||||
|
||||
static struct attribute_group tsc2005_attr_group = {
|
||||
.attrs = tsc2005_attrs,
|
||||
};
|
||||
|
||||
static int __devinit tsc2005_setup(struct tsc2005 *ts,
|
||||
struct tsc2005_platform_data *pdata)
|
||||
{
|
||||
int r;
|
||||
int fudge_x;
|
||||
int fudge_y;
|
||||
int fudge_p;
|
||||
int p_max;
|
||||
int x_max;
|
||||
int y_max;
|
||||
|
||||
mutex_init(&ts->mutex);
|
||||
|
||||
tsc2005_setup_spi_xfer(ts);
|
||||
|
||||
init_timer(&ts->penup_timer);
|
||||
setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
|
||||
INIT_WORK(&ts->penup_work, tsc2005_penup_work);
|
||||
|
||||
fudge_x = pdata->ts_x_fudge ? : 4;
|
||||
fudge_y = pdata->ts_y_fudge ? : 8;
|
||||
fudge_p = pdata->ts_pressure_fudge ? : 2;
|
||||
x_max = pdata->ts_x_max ? : MAX_12BIT;
|
||||
y_max = pdata->ts_y_max ? : MAX_12BIT;
|
||||
p_max = pdata->ts_pressure_max ? : MAX_12BIT;
|
||||
ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
|
||||
ts->esd_timeout = pdata->esd_timeout_ms;
|
||||
ts->set_reset = pdata->set_reset;
|
||||
|
||||
ts->idev = input_allocate_device();
|
||||
if (ts->idev == NULL)
|
||||
return -ENOMEM;
|
||||
ts->idev->name = "TSC2005 touchscreen";
|
||||
snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
|
||||
dev_name(&ts->spi->dev));
|
||||
ts->idev->phys = ts->phys;
|
||||
ts->idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
|
||||
ts->idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
|
||||
ts->idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
|
||||
|
||||
input_set_abs_params(ts->idev, ABS_X, 0, x_max, fudge_x, 0);
|
||||
input_set_abs_params(ts->idev, ABS_Y, 0, y_max, fudge_y, 0);
|
||||
input_set_abs_params(ts->idev, ABS_PRESSURE, 0, p_max, fudge_p, 0);
|
||||
|
||||
r = request_threaded_irq(ts->spi->irq, tsc2005_irq_handler,
|
||||
tsc2005_irq_thread, IRQF_TRIGGER_RISING,
|
||||
"tsc2005", ts);
|
||||
if (r) {
|
||||
dev_err(&ts->spi->dev, "request_threaded_irq(): %d\n", r);
|
||||
goto err1;
|
||||
}
|
||||
set_irq_wake(ts->spi->irq, 1);
|
||||
|
||||
r = input_register_device(ts->idev);
|
||||
if (r) {
|
||||
dev_err(&ts->spi->dev, "input_register_device(): %d\n", r);
|
||||
goto err2;
|
||||
}
|
||||
|
||||
r = sysfs_create_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
|
||||
if (r)
|
||||
dev_warn(&ts->spi->dev, "sysfs entry creation failed: %d\n", r);
|
||||
|
||||
tsc2005_start_scan(ts);
|
||||
|
||||
if (!ts->esd_timeout || !ts->set_reset)
|
||||
goto done;
|
||||
|
||||
/* start the optional ESD watchdog */
|
||||
setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts);
|
||||
INIT_WORK(&ts->esd_work, tsc2005_esd_work);
|
||||
mod_timer(&ts->esd_timer,
|
||||
round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
|
||||
|
||||
done:
|
||||
return 0;
|
||||
|
||||
err2:
|
||||
free_irq(ts->spi->irq, ts);
|
||||
|
||||
err1:
|
||||
input_free_device(ts->idev);
|
||||
return r;
|
||||
}
|
||||
|
||||
static int __devinit tsc2005_probe(struct spi_device *spi)
|
||||
{
|
||||
struct tsc2005_platform_data *pdata = spi->dev.platform_data;
|
||||
struct tsc2005 *ts;
|
||||
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;
|
||||
if (!spi->max_speed_hz)
|
||||
spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
|
||||
spi_setup(spi);
|
||||
|
||||
r = tsc2005_setup(ts, pdata);
|
||||
if (r)
|
||||
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);
|
||||
|
||||
if (ts->esd_timeout)
|
||||
del_timer_sync(&ts->esd_timer);
|
||||
del_timer_sync(&ts->penup_timer);
|
||||
|
||||
flush_work(&ts->esd_work);
|
||||
flush_work(&ts->penup_work);
|
||||
|
||||
sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
|
||||
free_irq(ts->spi->irq, ts);
|
||||
input_unregister_device(ts->idev);
|
||||
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@nokia.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:tsc2005");
|
||||
41
include/linux/spi/tsc2005.h
Normal file
41
include/linux/spi/tsc2005.h
Normal file
|
|
@ -0,0 +1,41 @@
|
|||
/*
|
||||
* This file is part of TSC2005 touchscreen driver
|
||||
*
|
||||
* Copyright (C) 2009-2010 Nokia Corporation
|
||||
*
|
||||
* Contact: Aaro Koskinen <aaro.koskinen@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
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _LINUX_SPI_TSC2005_H
|
||||
#define _LINUX_SPI_TSC2005_H
|
||||
|
||||
#include <linux/types.h>
|
||||
|
||||
struct tsc2005_platform_data {
|
||||
int ts_pressure_max;
|
||||
int ts_pressure_fudge;
|
||||
int ts_x_max;
|
||||
int ts_x_fudge;
|
||||
int ts_y_max;
|
||||
int ts_y_fudge;
|
||||
int ts_x_plate_ohm;
|
||||
unsigned int esd_timeout_ms;
|
||||
void (*set_reset)(bool enable);
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue