Input: add tsc2007 based touchscreen driver
This drive has been tested on ARM9 based SoC - MV86XX. Signed-off-by: Kwangwoo Lee <kwangwoo.lee@gmail.com> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Kwangwoo Lee
Dmitry Torokhov
parent
8bbf2703c4
commit
50b6f1f4a4
|
|
@ -389,4 +389,15 @@ config TOUCHSCREEN_TOUCHIT213
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called touchit213.
|
||||
|
||||
config TOUCHSCREEN_TSC2007
|
||||
tristate "TSC2007 based touchscreens"
|
||||
depends on I2C
|
||||
help
|
||||
Say Y here if you have a TSC2007 based touchscreen.
|
||||
|
||||
If unsure, say N.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called tsc2007.
|
||||
|
||||
endif
|
||||
|
|
|
|||
|
|
@ -25,6 +25,7 @@ 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-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
|
||||
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
|
||||
obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
|
||||
obj-$(CONFIG_TOUCHSCREEN_WM97XX) += wm97xx-ts.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,381 @@
|
|||
/*
|
||||
* drivers/input/touchscreen/tsc2007.c
|
||||
*
|
||||
* Copyright (c) 2008 MtekVision Co., Ltd.
|
||||
* Kwangwoo Lee <kwlee@mtekvision.com>
|
||||
*
|
||||
* Using code from:
|
||||
* - ads7846.c
|
||||
* Copyright (c) 2005 David Brownell
|
||||
* Copyright (c) 2006 Nokia Corporation
|
||||
* - corgi_ts.c
|
||||
* Copyright (C) 2004-2005 Richard Purdie
|
||||
* - omap_ts.[hc], ads7846.h, ts_osk.c
|
||||
* Copyright (C) 2002 MontaVista Software
|
||||
* Copyright (C) 2004 Texas Instruments
|
||||
* Copyright (C) 2005 Dirk Behme
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/hrtimer.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/input.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/i2c/tsc2007.h>
|
||||
|
||||
#define TS_POLL_DELAY (10 * 1000) /* ns delay before the first sample */
|
||||
#define TS_POLL_PERIOD (5 * 1000) /* ns delay between samples */
|
||||
|
||||
#define TSC2007_MEASURE_TEMP0 (0x0 << 4)
|
||||
#define TSC2007_MEASURE_AUX (0x2 << 4)
|
||||
#define TSC2007_MEASURE_TEMP1 (0x4 << 4)
|
||||
#define TSC2007_ACTIVATE_XN (0x8 << 4)
|
||||
#define TSC2007_ACTIVATE_YN (0x9 << 4)
|
||||
#define TSC2007_ACTIVATE_YP_XN (0xa << 4)
|
||||
#define TSC2007_SETUP (0xb << 4)
|
||||
#define TSC2007_MEASURE_X (0xc << 4)
|
||||
#define TSC2007_MEASURE_Y (0xd << 4)
|
||||
#define TSC2007_MEASURE_Z1 (0xe << 4)
|
||||
#define TSC2007_MEASURE_Z2 (0xf << 4)
|
||||
|
||||
#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2)
|
||||
#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2)
|
||||
#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2)
|
||||
#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2)
|
||||
|
||||
#define TSC2007_12BIT (0x0 << 1)
|
||||
#define TSC2007_8BIT (0x1 << 1)
|
||||
|
||||
#define MAX_12BIT ((1 << 12) - 1)
|
||||
|
||||
#define ADC_ON_12BIT (TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)
|
||||
|
||||
#define READ_Y (ADC_ON_12BIT | TSC2007_MEASURE_Y)
|
||||
#define READ_Z1 (ADC_ON_12BIT | TSC2007_MEASURE_Z1)
|
||||
#define READ_Z2 (ADC_ON_12BIT | TSC2007_MEASURE_Z2)
|
||||
#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X)
|
||||
#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)
|
||||
|
||||
struct ts_event {
|
||||
u16 x;
|
||||
u16 y;
|
||||
u16 z1, z2;
|
||||
};
|
||||
|
||||
struct tsc2007 {
|
||||
struct input_dev *input;
|
||||
char phys[32];
|
||||
struct hrtimer timer;
|
||||
struct ts_event tc;
|
||||
|
||||
struct i2c_client *client;
|
||||
|
||||
spinlock_t lock;
|
||||
|
||||
u16 model;
|
||||
u16 x_plate_ohms;
|
||||
|
||||
unsigned pendown;
|
||||
int irq;
|
||||
|
||||
int (*get_pendown_state)(void);
|
||||
void (*clear_penirq)(void);
|
||||
};
|
||||
|
||||
static inline int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd)
|
||||
{
|
||||
s32 data;
|
||||
u16 val;
|
||||
|
||||
data = i2c_smbus_read_word_data(tsc->client, cmd);
|
||||
if (data < 0) {
|
||||
dev_err(&tsc->client->dev, "i2c io error: %d\n", data);
|
||||
return data;
|
||||
}
|
||||
|
||||
/* The protocol and raw data format from i2c interface:
|
||||
* S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P
|
||||
* Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit].
|
||||
*/
|
||||
val = swab16(data) >> 4;
|
||||
|
||||
dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val);
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
static void tsc2007_send_event(void *tsc)
|
||||
{
|
||||
struct tsc2007 *ts = tsc;
|
||||
u32 rt;
|
||||
u16 x, y, z1, z2;
|
||||
|
||||
x = ts->tc.x;
|
||||
y = ts->tc.y;
|
||||
z1 = ts->tc.z1;
|
||||
z2 = ts->tc.z2;
|
||||
|
||||
/* range filtering */
|
||||
if (x == MAX_12BIT)
|
||||
x = 0;
|
||||
|
||||
if (likely(x && z1)) {
|
||||
/* compute touch pressure resistance using equation #1 */
|
||||
rt = z2;
|
||||
rt -= z1;
|
||||
rt *= x;
|
||||
rt *= ts->x_plate_ohms;
|
||||
rt /= z1;
|
||||
rt = (rt + 2047) >> 12;
|
||||
} else
|
||||
rt = 0;
|
||||
|
||||
/* Sample found inconsistent by debouncing or pressure is beyond
|
||||
* the maximum. Don't report it to user space, repeat at least
|
||||
* once more the measurement
|
||||
*/
|
||||
if (rt > MAX_12BIT) {
|
||||
dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
|
||||
|
||||
hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
|
||||
HRTIMER_MODE_REL);
|
||||
return;
|
||||
}
|
||||
|
||||
/* NOTE: We can't rely on the pressure to determine the pen down
|
||||
* state, even this controller has a pressure sensor. The pressure
|
||||
* value can fluctuate for quite a while after lifting the pen and
|
||||
* in some cases may not even settle at the expected value.
|
||||
*
|
||||
* The only safe way to check for the pen up condition is in the
|
||||
* timer by reading the pen signal state (it's a GPIO _and_ IRQ).
|
||||
*/
|
||||
if (rt) {
|
||||
struct input_dev *input = ts->input;
|
||||
|
||||
if (!ts->pendown) {
|
||||
dev_dbg(&ts->client->dev, "DOWN\n");
|
||||
|
||||
input_report_key(input, BTN_TOUCH, 1);
|
||||
ts->pendown = 1;
|
||||
}
|
||||
|
||||
input_report_abs(input, ABS_X, x);
|
||||
input_report_abs(input, ABS_Y, y);
|
||||
input_report_abs(input, ABS_PRESSURE, rt);
|
||||
|
||||
input_sync(input);
|
||||
|
||||
dev_dbg(&ts->client->dev, "point(%4d,%4d), pressure (%4u)\n",
|
||||
x, y, rt);
|
||||
}
|
||||
|
||||
hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
|
||||
HRTIMER_MODE_REL);
|
||||
}
|
||||
|
||||
static int tsc2007_read_values(struct tsc2007 *tsc)
|
||||
{
|
||||
/* y- still on; turn on only y+ (and ADC) */
|
||||
tsc->tc.y = tsc2007_xfer(tsc, READ_Y);
|
||||
|
||||
/* turn y- off, x+ on, then leave in lowpower */
|
||||
tsc->tc.x = tsc2007_xfer(tsc, READ_X);
|
||||
|
||||
/* turn y+ off, x- on; we'll use formula #1 */
|
||||
tsc->tc.z1 = tsc2007_xfer(tsc, READ_Z1);
|
||||
tsc->tc.z2 = tsc2007_xfer(tsc, READ_Z2);
|
||||
|
||||
/* power down */
|
||||
tsc2007_xfer(tsc, PWRDOWN);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static enum hrtimer_restart tsc2007_timer(struct hrtimer *handle)
|
||||
{
|
||||
struct tsc2007 *ts = container_of(handle, struct tsc2007, timer);
|
||||
|
||||
spin_lock_irq(&ts->lock);
|
||||
|
||||
if (unlikely(!ts->get_pendown_state() && ts->pendown)) {
|
||||
struct input_dev *input = ts->input;
|
||||
|
||||
dev_dbg(&ts->client->dev, "UP\n");
|
||||
|
||||
input_report_key(input, BTN_TOUCH, 0);
|
||||
input_report_abs(input, ABS_PRESSURE, 0);
|
||||
input_sync(input);
|
||||
|
||||
ts->pendown = 0;
|
||||
enable_irq(ts->irq);
|
||||
} else {
|
||||
/* pen is still down, continue with the measurement */
|
||||
dev_dbg(&ts->client->dev, "pen is still down\n");
|
||||
|
||||
tsc2007_read_values(ts);
|
||||
tsc2007_send_event(ts);
|
||||
}
|
||||
|
||||
spin_unlock_irq(&ts->lock);
|
||||
|
||||
return HRTIMER_NORESTART;
|
||||
}
|
||||
|
||||
static irqreturn_t tsc2007_irq(int irq, void *handle)
|
||||
{
|
||||
struct tsc2007 *ts = handle;
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&ts->lock, flags);
|
||||
|
||||
if (likely(ts->get_pendown_state())) {
|
||||
disable_irq(ts->irq);
|
||||
hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
|
||||
HRTIMER_MODE_REL);
|
||||
}
|
||||
|
||||
if (ts->clear_penirq)
|
||||
ts->clear_penirq();
|
||||
|
||||
spin_unlock_irqrestore(&ts->lock, flags);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int tsc2007_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct tsc2007 *ts;
|
||||
struct tsc2007_platform_data *pdata = pdata = client->dev.platform_data;
|
||||
struct input_dev *input_dev;
|
||||
int err;
|
||||
|
||||
if (!pdata) {
|
||||
dev_err(&client->dev, "platform data is required!\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!i2c_check_functionality(client->adapter,
|
||||
I2C_FUNC_SMBUS_READ_WORD_DATA))
|
||||
return -EIO;
|
||||
|
||||
ts = kzalloc(sizeof(struct tsc2007), GFP_KERNEL);
|
||||
input_dev = input_allocate_device();
|
||||
if (!ts || !input_dev) {
|
||||
err = -ENOMEM;
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
ts->client = client;
|
||||
i2c_set_clientdata(client, ts);
|
||||
|
||||
ts->input = input_dev;
|
||||
|
||||
hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
||||
ts->timer.function = tsc2007_timer;
|
||||
|
||||
spin_lock_init(&ts->lock);
|
||||
|
||||
ts->model = pdata->model;
|
||||
ts->x_plate_ohms = pdata->x_plate_ohms;
|
||||
ts->get_pendown_state = pdata->get_pendown_state;
|
||||
ts->clear_penirq = pdata->clear_penirq;
|
||||
|
||||
pdata->init_platform_hw();
|
||||
|
||||
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", client->dev.bus_id);
|
||||
|
||||
input_dev->name = "TSC2007 Touchscreen";
|
||||
input_dev->phys = ts->phys;
|
||||
input_dev->id.bustype = BUS_I2C;
|
||||
|
||||
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
|
||||
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
|
||||
|
||||
input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
|
||||
input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
|
||||
input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0);
|
||||
|
||||
tsc2007_read_values(ts);
|
||||
|
||||
ts->irq = client->irq;
|
||||
|
||||
err = request_irq(ts->irq, tsc2007_irq, 0,
|
||||
client->dev.driver->name, ts);
|
||||
if (err < 0) {
|
||||
dev_err(&client->dev, "irq %d busy?\n", ts->irq);
|
||||
goto err_free_mem;
|
||||
}
|
||||
|
||||
err = input_register_device(input_dev);
|
||||
if (err)
|
||||
goto err_free_irq;
|
||||
|
||||
dev_info(&client->dev, "registered with irq (%d)\n", ts->irq);
|
||||
|
||||
return 0;
|
||||
|
||||
err_free_irq:
|
||||
free_irq(ts->irq, ts);
|
||||
hrtimer_cancel(&ts->timer);
|
||||
err_free_mem:
|
||||
input_free_device(input_dev);
|
||||
kfree(ts);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int tsc2007_remove(struct i2c_client *client)
|
||||
{
|
||||
struct tsc2007 *ts = i2c_get_clientdata(client);
|
||||
struct tsc2007_platform_data *pdata;
|
||||
|
||||
pdata = client->dev.platform_data;
|
||||
pdata->exit_platform_hw();
|
||||
|
||||
free_irq(ts->irq, ts);
|
||||
hrtimer_cancel(&ts->timer);
|
||||
input_unregister_device(ts->input);
|
||||
kfree(ts);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct i2c_device_id tsc2007_idtable[] = {
|
||||
{ "tsc2007", 0 },
|
||||
{ }
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, tsc2007_idtable);
|
||||
|
||||
static struct i2c_driver tsc2007_driver = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "tsc2007"
|
||||
},
|
||||
.id_table = tsc2007_idtable,
|
||||
.probe = tsc2007_probe,
|
||||
.remove = tsc2007_remove,
|
||||
};
|
||||
|
||||
static int __init tsc2007_init(void)
|
||||
{
|
||||
return i2c_add_driver(&tsc2007_driver);
|
||||
}
|
||||
|
||||
static void __exit tsc2007_exit(void)
|
||||
{
|
||||
i2c_del_driver(&tsc2007_driver);
|
||||
}
|
||||
|
||||
module_init(tsc2007_init);
|
||||
module_exit(tsc2007_exit);
|
||||
|
||||
MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
|
||||
MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
#ifndef __LINUX_I2C_TSC2007_H
|
||||
#define __LINUX_I2C_TSC2007_H
|
||||
|
||||
/* linux/i2c/tsc2007.h */
|
||||
|
||||
struct tsc2007_platform_data {
|
||||
u16 model; /* 2007. */
|
||||
u16 x_plate_ohms;
|
||||
|
||||
int (*get_pendown_state)(void);
|
||||
void (*clear_penirq)(void); /* If needed, clear 2nd level
|
||||
interrupt source */
|
||||
int (*init_platform_hw)(void);
|
||||
void (*exit_platform_hw)(void);
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue