mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
e2619cf78e
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
407 lines
9.6 KiB
C
407 lines
9.6 KiB
C
/*
|
|
* 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/slab.h>
|
|
#include <linux/input.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/i2c/tsc2007.h>
|
|
|
|
#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 i2c_client *client;
|
|
|
|
u16 model;
|
|
u16 x_plate_ohms;
|
|
u16 max_rt;
|
|
unsigned long poll_delay;
|
|
unsigned long poll_period;
|
|
|
|
int irq;
|
|
|
|
wait_queue_head_t wait;
|
|
bool stopped;
|
|
|
|
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_read_values(struct tsc2007 *tsc, struct ts_event *tc)
|
|
{
|
|
/* y- still on; turn on only y+ (and ADC) */
|
|
tc->y = tsc2007_xfer(tsc, READ_Y);
|
|
|
|
/* turn y- off, x+ on, then leave in lowpower */
|
|
tc->x = tsc2007_xfer(tsc, READ_X);
|
|
|
|
/* turn y+ off, x- on; we'll use formula #1 */
|
|
tc->z1 = tsc2007_xfer(tsc, READ_Z1);
|
|
tc->z2 = tsc2007_xfer(tsc, READ_Z2);
|
|
|
|
/* Prepare for next touch reading - power down ADC, enable PENIRQ */
|
|
tsc2007_xfer(tsc, PWRDOWN);
|
|
}
|
|
|
|
static u32 tsc2007_calculate_pressure(struct tsc2007 *tsc, struct ts_event *tc)
|
|
{
|
|
u32 rt = 0;
|
|
|
|
/* range filtering */
|
|
if (tc->x == MAX_12BIT)
|
|
tc->x = 0;
|
|
|
|
if (likely(tc->x && tc->z1)) {
|
|
/* compute touch pressure resistance using equation #1 */
|
|
rt = tc->z2 - tc->z1;
|
|
rt *= tc->x;
|
|
rt *= tsc->x_plate_ohms;
|
|
rt /= tc->z1;
|
|
rt = (rt + 2047) >> 12;
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static bool tsc2007_is_pen_down(struct tsc2007 *ts)
|
|
{
|
|
/*
|
|
* NOTE: We can't rely on the pressure to determine the pen down
|
|
* state, even though 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
|
|
* work function by reading the pen signal state (it's a GPIO
|
|
* and IRQ). Unfortunately such callback is not always available,
|
|
* in that case we assume that the pen is down and expect caller
|
|
* to fall back on the pressure reading.
|
|
*/
|
|
|
|
if (!ts->get_pendown_state)
|
|
return true;
|
|
|
|
return ts->get_pendown_state();
|
|
}
|
|
|
|
static irqreturn_t tsc2007_soft_irq(int irq, void *handle)
|
|
{
|
|
struct tsc2007 *ts = handle;
|
|
struct input_dev *input = ts->input;
|
|
struct ts_event tc;
|
|
u32 rt;
|
|
|
|
while (!ts->stopped && tsc2007_is_pen_down(ts)) {
|
|
|
|
/* pen is down, continue with the measurement */
|
|
tsc2007_read_values(ts, &tc);
|
|
|
|
rt = tsc2007_calculate_pressure(ts, &tc);
|
|
|
|
if (rt == 0 && !ts->get_pendown_state) {
|
|
/*
|
|
* If pressure reported is 0 and we don't have
|
|
* callback to check pendown state, we have to
|
|
* assume that pen was lifted up.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
if (rt <= ts->max_rt) {
|
|
dev_dbg(&ts->client->dev,
|
|
"DOWN point(%4d,%4d), pressure (%4u)\n",
|
|
tc.x, tc.y, rt);
|
|
|
|
input_report_key(input, BTN_TOUCH, 1);
|
|
input_report_abs(input, ABS_X, tc.x);
|
|
input_report_abs(input, ABS_Y, tc.y);
|
|
input_report_abs(input, ABS_PRESSURE, rt);
|
|
|
|
input_sync(input);
|
|
|
|
} else {
|
|
/*
|
|
* 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.
|
|
*/
|
|
dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt);
|
|
}
|
|
|
|
wait_event_timeout(ts->wait, ts->stopped,
|
|
msecs_to_jiffies(ts->poll_period));
|
|
}
|
|
|
|
dev_dbg(&ts->client->dev, "UP\n");
|
|
|
|
input_report_key(input, BTN_TOUCH, 0);
|
|
input_report_abs(input, ABS_PRESSURE, 0);
|
|
input_sync(input);
|
|
|
|
if (ts->clear_penirq)
|
|
ts->clear_penirq();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t tsc2007_hard_irq(int irq, void *handle)
|
|
{
|
|
struct tsc2007 *ts = handle;
|
|
|
|
if (!ts->get_pendown_state || likely(ts->get_pendown_state()))
|
|
return IRQ_WAKE_THREAD;
|
|
|
|
if (ts->clear_penirq)
|
|
ts->clear_penirq();
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void tsc2007_stop(struct tsc2007 *ts)
|
|
{
|
|
ts->stopped = true;
|
|
mb();
|
|
wake_up(&ts->wait);
|
|
|
|
disable_irq(ts->irq);
|
|
}
|
|
|
|
static int tsc2007_open(struct input_dev *input_dev)
|
|
{
|
|
struct tsc2007 *ts = input_get_drvdata(input_dev);
|
|
int err;
|
|
|
|
ts->stopped = false;
|
|
mb();
|
|
|
|
enable_irq(ts->irq);
|
|
|
|
/* Prepare for touch readings - power down ADC and enable PENIRQ */
|
|
err = tsc2007_xfer(ts, PWRDOWN);
|
|
if (err < 0) {
|
|
tsc2007_stop(ts);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tsc2007_close(struct input_dev *input_dev)
|
|
{
|
|
struct tsc2007 *ts = input_get_drvdata(input_dev);
|
|
|
|
tsc2007_stop(ts);
|
|
}
|
|
|
|
static int tsc2007_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct tsc2007 *ts;
|
|
struct tsc2007_platform_data *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;
|
|
ts->irq = client->irq;
|
|
ts->input = input_dev;
|
|
init_waitqueue_head(&ts->wait);
|
|
|
|
ts->model = pdata->model;
|
|
ts->x_plate_ohms = pdata->x_plate_ohms;
|
|
ts->max_rt = pdata->max_rt ? : MAX_12BIT;
|
|
ts->poll_delay = pdata->poll_delay ? : 1;
|
|
ts->poll_period = pdata->poll_period ? : 1;
|
|
ts->get_pendown_state = pdata->get_pendown_state;
|
|
ts->clear_penirq = pdata->clear_penirq;
|
|
|
|
if (pdata->x_plate_ohms == 0) {
|
|
dev_err(&client->dev, "x_plate_ohms is not set up in platform data");
|
|
err = -EINVAL;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
snprintf(ts->phys, sizeof(ts->phys),
|
|
"%s/input0", dev_name(&client->dev));
|
|
|
|
input_dev->name = "TSC2007 Touchscreen";
|
|
input_dev->phys = ts->phys;
|
|
input_dev->id.bustype = BUS_I2C;
|
|
|
|
input_dev->open = tsc2007_open;
|
|
input_dev->close = tsc2007_close;
|
|
|
|
input_set_drvdata(input_dev, ts);
|
|
|
|
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, pdata->fuzzx, 0);
|
|
input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, pdata->fuzzy, 0);
|
|
input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT,
|
|
pdata->fuzzz, 0);
|
|
|
|
if (pdata->init_platform_hw)
|
|
pdata->init_platform_hw();
|
|
|
|
err = request_threaded_irq(ts->irq, tsc2007_hard_irq, tsc2007_soft_irq,
|
|
IRQF_ONESHOT, client->dev.driver->name, ts);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "irq %d busy?\n", ts->irq);
|
|
goto err_free_mem;
|
|
}
|
|
|
|
tsc2007_stop(ts);
|
|
|
|
err = input_register_device(input_dev);
|
|
if (err)
|
|
goto err_free_irq;
|
|
|
|
i2c_set_clientdata(client, ts);
|
|
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
free_irq(ts->irq, ts);
|
|
if (pdata->exit_platform_hw)
|
|
pdata->exit_platform_hw();
|
|
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 = client->dev.platform_data;
|
|
|
|
free_irq(ts->irq, ts);
|
|
|
|
if (pdata->exit_platform_hw)
|
|
pdata->exit_platform_hw();
|
|
|
|
input_unregister_device(ts->input);
|
|
kfree(ts);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const 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,
|
|
};
|
|
|
|
module_i2c_driver(tsc2007_driver);
|
|
|
|
MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>");
|
|
MODULE_DESCRIPTION("TSC2007 TouchScreen Driver");
|
|
MODULE_LICENSE("GPL");
|