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input: STMPE touch controller support

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This one adds a driver for STMPE touchscreen controllers.
This driver depends on the stmpexxx mfd core driver.

Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Luotao Fu 2010-07-02 14:10:29 +02:00 committed by Samuel Ortiz
parent 76f1084531
commit f94add3bd4
3 changed files with 408 additions and 0 deletions
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10
drivers/input/touchscreen/Kconfig
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@ -628,4 +628,14 @@ config TOUCHSCREEN_TPS6507X
To compile this driver as a module, choose M here: the
module will be called tps6507x_ts.
config TOUCHSCREEN_STMPE
tristate "STMicroelectronics STMPE touchscreens"
depends on MFD_STMPE
help
Say Y here if you want support for STMicroelectronics
STMPE touchscreen controllers.
To compile this driver as a module, choose M here: the
module will be called stmpe-ts.
endif

1
drivers/input/touchscreen/Makefile
View File

@ -36,6 +36,7 @@ obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
obj-$(CONFIG_TOUCHSCREEN_QT602240) += qt602240_ts.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o

397
drivers/input/touchscreen/stmpe-ts.c Normal file
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@ -0,0 +1,397 @@
/* STMicroelectronics STMPE811 Touchscreen Driver
*
* (C) 2010 Luotao Fu <l.fu@pengutronix.de>
* All rights reserved.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <linux/mfd/stmpe.h>
/* Register layouts and functionalities are identical on all stmpexxx variants
* with touchscreen controller
*/
#define STMPE_REG_INT_STA 0x0B
#define STMPE_REG_ADC_CTRL1 0x20
#define STMPE_REG_ADC_CTRL2 0x21
#define STMPE_REG_TSC_CTRL 0x40
#define STMPE_REG_TSC_CFG 0x41
#define STMPE_REG_FIFO_TH 0x4A
#define STMPE_REG_FIFO_STA 0x4B
#define STMPE_REG_FIFO_SIZE 0x4C
#define STMPE_REG_TSC_DATA_XYZ 0x52
#define STMPE_REG_TSC_FRACTION_Z 0x56
#define STMPE_REG_TSC_I_DRIVE 0x58
#define OP_MOD_XYZ 0
#define STMPE_TSC_CTRL_TSC_EN (1<<0)
#define STMPE_FIFO_STA_RESET (1<<0)
#define STMPE_IRQ_TOUCH_DET 0
#define SAMPLE_TIME(x) ((x & 0xf) << 4)
#define MOD_12B(x) ((x & 0x1) << 3)
#define REF_SEL(x) ((x & 0x1) << 1)
#define ADC_FREQ(x) (x & 0x3)
#define AVE_CTRL(x) ((x & 0x3) << 6)
#define DET_DELAY(x) ((x & 0x7) << 3)
#define SETTLING(x) (x & 0x7)
#define FRACTION_Z(x) (x & 0x7)
#define I_DRIVE(x) (x & 0x1)
#define OP_MODE(x) ((x & 0x7) << 1)
#define STMPE_TS_NAME "stmpe-ts"
#define XY_MASK 0xfff
struct stmpe_touch {
struct stmpe *stmpe;
struct input_dev *idev;
struct delayed_work work;
struct device *dev;
u8 sample_time;
u8 mod_12b;
u8 ref_sel;
u8 adc_freq;
u8 ave_ctrl;
u8 touch_det_delay;
u8 settling;
u8 fraction_z;
u8 i_drive;
};
static int __stmpe_reset_fifo(struct stmpe *stmpe)
{
int ret;
ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
if (ret)
return ret;
return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
STMPE_FIFO_STA_RESET, 0);
}
static void stmpe_work(struct work_struct *work)
{
int int_sta;
u32 timeout = 40;
struct stmpe_touch *ts =
container_of(work, struct stmpe_touch, work.work);
int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
/*
* touch_det sometimes get desasserted or just get stuck. This appears
* to be a silicon bug, We still have to clearify this with the
* manufacture. As a workaround We release the key anyway if the
* touch_det keeps coming in after 4ms, while the FIFO contains no value
* during the whole time.
*/
while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
timeout--;
int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
udelay(100);
}
/* reset the FIFO before we report release event */
__stmpe_reset_fifo(ts->stmpe);
input_report_abs(ts->idev, ABS_PRESSURE, 0);
input_sync(ts->idev);
}
static irqreturn_t stmpe_ts_handler(int irq, void *data)
{
u8 data_set[4];
int x, y, z;
struct stmpe_touch *ts = data;
/*
* Cancel scheduled polling for release if we have new value
* available. Wait if the polling is already running.
*/
cancel_delayed_work_sync(&ts->work);
/*
* The FIFO sometimes just crashes and stops generating interrupts. This
* appears to be a silicon bug. We still have to clearify this with
* the manufacture. As a workaround we disable the TSC while we are
* collecting data and flush the FIFO after reading
*/
stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
STMPE_TSC_CTRL_TSC_EN, 0);
stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
x = (data_set[0] << 4) | (data_set[1] >> 4);
y = ((data_set[1] & 0xf) << 8) | data_set[2];
z = data_set[3];
input_report_abs(ts->idev, ABS_X, x);
input_report_abs(ts->idev, ABS_Y, y);
input_report_abs(ts->idev, ABS_PRESSURE, z);
input_sync(ts->idev);
/* flush the FIFO after we have read out our values. */
__stmpe_reset_fifo(ts->stmpe);
/* reenable the tsc */
stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
/* start polling for touch_det to detect release */
schedule_delayed_work(&ts->work, HZ / 50);
return IRQ_HANDLED;
}
static int __devinit stmpe_init_hw(struct stmpe_touch *ts)
{
int ret;
u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
struct stmpe *stmpe = ts->stmpe;
struct device *dev = ts->dev;
ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
if (ret) {
dev_err(dev, "Could not enable clock for ADC and TS\n");
return ret;
}
adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
REF_SEL(ts->ref_sel);
adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);
ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
adc_ctrl1_mask, adc_ctrl1);
if (ret) {
dev_err(dev, "Could not setup ADC\n");
return ret;
}
ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
if (ret) {
dev_err(dev, "Could not setup ADC\n");
return ret;
}
tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
SETTLING(ts->settling);
tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff);
ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
if (ret) {
dev_err(dev, "Could not config touch\n");
return ret;
}
ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
if (ret) {
dev_err(dev, "Could not config touch\n");
return ret;
}
ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
I_DRIVE(0xff), I_DRIVE(ts->i_drive));
if (ret) {
dev_err(dev, "Could not config touch\n");
return ret;
}
/* set FIFO to 1 for single point reading */
ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
if (ret) {
dev_err(dev, "Could not set FIFO\n");
return ret;
}
ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
if (ret) {
dev_err(dev, "Could not set mode\n");
return ret;
}
return 0;
}
static int stmpe_ts_open(struct input_dev *dev)
{
struct stmpe_touch *ts = input_get_drvdata(dev);
int ret = 0;
ret = __stmpe_reset_fifo(ts->stmpe);
if (ret)
return ret;
return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
}
static void stmpe_ts_close(struct input_dev *dev)
{
struct stmpe_touch *ts = input_get_drvdata(dev);
cancel_delayed_work_sync(&ts->work);
stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
STMPE_TSC_CTRL_TSC_EN, 0);
}
static int __devinit stmpe_input_probe(struct platform_device *pdev)
{
struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
struct stmpe_platform_data *pdata = stmpe->pdata;
struct stmpe_touch *ts;
struct input_dev *idev;
struct stmpe_ts_platform_data *ts_pdata = NULL;
int ret = 0;
unsigned int ts_irq;
ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
if (ts_irq < 0)
return ts_irq;
ts = kzalloc(sizeof(*ts), GFP_KERNEL);
if (!ts)
goto err_out;
idev = input_allocate_device();
if (!idev)
goto err_free_ts;
platform_set_drvdata(pdev, ts);
ts->stmpe = stmpe;
ts->idev = idev;
ts->dev = &pdev->dev;
if (pdata)
ts_pdata = pdata->ts;
if (ts_pdata) {
ts->sample_time = ts_pdata->sample_time;
ts->mod_12b = ts_pdata->mod_12b;
ts->ref_sel = ts_pdata->ref_sel;
ts->adc_freq = ts_pdata->adc_freq;
ts->ave_ctrl = ts_pdata->ave_ctrl;
ts->touch_det_delay = ts_pdata->touch_det_delay;
ts->settling = ts_pdata->settling;
ts->fraction_z = ts_pdata->fraction_z;
ts->i_drive = ts_pdata->i_drive;
}
INIT_DELAYED_WORK(&ts->work, stmpe_work);
ret = request_threaded_irq(ts_irq, NULL, stmpe_ts_handler,
IRQF_ONESHOT, STMPE_TS_NAME, ts);
if (ret) {
dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
goto err_free_input;
}
ret = stmpe_init_hw(ts);
if (ret)
goto err_free_irq;
idev->name = STMPE_TS_NAME;
idev->id.bustype = BUS_I2C;
idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
idev->open = stmpe_ts_open;
idev->close = stmpe_ts_close;
input_set_drvdata(idev, ts);
input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
ret = input_register_device(idev);
if (ret) {
dev_err(&pdev->dev, "Could not register input device\n");
goto err_free_irq;
}
return ret;
err_free_irq:
free_irq(ts_irq, ts);
err_free_input:
input_free_device(idev);
platform_set_drvdata(pdev, NULL);
err_free_ts:
kfree(ts);
err_out:
return ret;
}
static int __devexit stmpe_ts_remove(struct platform_device *pdev)
{
struct stmpe_touch *ts = platform_get_drvdata(pdev);
unsigned int ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
free_irq(ts_irq, ts);
platform_set_drvdata(pdev, NULL);
input_unregister_device(ts->idev);
input_free_device(ts->idev);
kfree(ts);
return 0;
}
static struct platform_driver stmpe_ts_driver = {
.driver = {
.name = STMPE_TS_NAME,
.owner = THIS_MODULE,
},
.probe = stmpe_input_probe,
.remove = __devexit_p(stmpe_ts_remove),
};
static int __init stmpe_ts_init(void)
{
return platform_driver_register(&stmpe_ts_driver);
}
module_init(stmpe_ts_init);
static void __exit stmpe_ts_exit(void)
{
platform_driver_unregister(&stmpe_ts_driver);
}
module_exit(stmpe_ts_exit);
MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" STMPE_TS_NAME);