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Input: ad7879 - split bus logic out

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The ad7879 driver is using the old bus method of only supporting one
at a time (I2C or SPI). So refactor it like the other input drivers
that support multiple busses simultaneously.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Mike Frysinger 2010-06-30 01:40:52 -07:00 committed by Dmitry Torokhov
parent 7cd7a82d16
commit 4397c98a8a
6 changed files with 484 additions and 415 deletions
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37
drivers/input/touchscreen/Kconfig
View File

@ -55,37 +55,36 @@ config TOUCHSCREEN_AD7877
To compile this driver as a module, choose M here: the
module will be called ad7877.
config TOUCHSCREEN_AD7879_I2C
tristate "AD7879 based touchscreens: AD7879-1 I2C Interface"
depends on I2C
select TOUCHSCREEN_AD7879
config TOUCHSCREEN_AD7879
tristate "Analog Devices AD7879-1/AD7889-1 touchscreen interface"
help
Say Y here if you have a touchscreen interface using the
AD7879-1/AD7889-1 controller, and your board-specific
initialization code includes that in its table of I2C devices.
Say Y here if you want to support a touchscreen interface using
the AD7879-1/AD7889-1 controller.
If unsure, say N (but it's safe to say "Y").
You should select a bus connection too.
To compile this driver as a module, choose M here: the
module will be called ad7879.
config TOUCHSCREEN_AD7879_I2C
tristate "support I2C bus connection"
depends on TOUCHSCREEN_AD7879 && I2C
help
Say Y here if you have AD7879-1/AD7889-1 hooked to an I2C bus.
To compile this driver as a module, choose M here: the
module will be called ad7879-i2c.
config TOUCHSCREEN_AD7879_SPI
tristate "AD7879 based touchscreens: AD7879 SPI Interface"
depends on SPI_MASTER && TOUCHSCREEN_AD7879_I2C = n
select TOUCHSCREEN_AD7879
tristate "support SPI bus connection"
depends on TOUCHSCREEN_AD7879 && SPI_MASTER
help
Say Y here if you have a touchscreen interface using the
AD7879/AD7889 controller, and your board-specific initialization
code includes that in its table of SPI devices.
Say Y here if you have AD7879-1/AD7889-1 hooked to a SPI bus.
If unsure, say N (but it's safe to say "Y").
To compile this driver as a module, choose M here: the
module will be called ad7879.
config TOUCHSCREEN_AD7879
tristate
default n
module will be called ad7879-spi.
config TOUCHSCREEN_BITSY
tristate "Compaq iPAQ H3600 (Bitsy) touchscreen"

2
drivers/input/touchscreen/Makefile
View File

@ -9,6 +9,8 @@ wm97xx-ts-y := wm97xx-core.o
obj-$(CONFIG_TOUCHSCREEN_88PM860X) += 88pm860x-ts.o
obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o
obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o
obj-$(CONFIG_TOUCHSCREEN_AD7879_I2C) += ad7879-i2c.o
obj-$(CONFIG_TOUCHSCREEN_AD7879_SPI) += ad7879-spi.o
obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o
obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o

140
drivers/input/touchscreen/ad7879-i2c.c Normal file
View File

@ -0,0 +1,140 @@
/*
* AD7879-1/AD7889-1 touchscreen (I2C bus)
*
* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/input.h> /* BUS_I2C */
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/types.h>
#include "ad7879.h"
#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
#ifdef CONFIG_PM
static int ad7879_i2c_suspend(struct i2c_client *client, pm_message_t message)
{
struct ad7879 *ts = i2c_get_clientdata(client);
ad7879_disable(ts);
return 0;
}
static int ad7879_i2c_resume(struct i2c_client *client)
{
struct ad7879 *ts = i2c_get_clientdata(client);
ad7879_enable(ts);
return 0;
}
#else
# define ad7879_i2c_suspend NULL
# define ad7879_i2c_resume NULL
#endif
/* All registers are word-sized.
* AD7879 uses a high-byte first convention.
*/
static int ad7879_i2c_read(struct device *dev, u8 reg)
{
struct i2c_client *client = to_i2c_client(dev);
return swab16(i2c_smbus_read_word_data(client, reg));
}
static int ad7879_i2c_multi_read(struct device *dev,
u8 first_reg, u8 count, u16 *buf)
{
u8 idx;
for (idx = 0; idx < count; ++idx)
buf[idx] = ad7879_i2c_read(dev, first_reg + idx);
return 0;
}
static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
{
struct i2c_client *client = to_i2c_client(dev);
return i2c_smbus_write_word_data(client, reg, swab16(val));
}
static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
.bustype = BUS_I2C,
.read = ad7879_i2c_read,
.multi_read = ad7879_i2c_multi_read,
.write = ad7879_i2c_write,
};
static int __devinit ad7879_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ad7879 *ts;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WORD_DATA)) {
dev_err(&client->dev, "SMBUS Word Data not Supported\n");
return -EIO;
}
ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
&ad7879_i2c_bus_ops);
if (IS_ERR(ts))
return PTR_ERR(ts);
i2c_set_clientdata(client, ts);
return 0;
}
static int __devexit ad7879_i2c_remove(struct i2c_client *client)
{
struct ad7879 *ts = i2c_get_clientdata(client);
ad7879_remove(ts);
return 0;
}
static const struct i2c_device_id ad7879_id[] = {
{ "ad7879", 0 },
{ "ad7889", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ad7879_id);
static struct i2c_driver ad7879_i2c_driver = {
.driver = {
.name = "ad7879",
.owner = THIS_MODULE,
},
.probe = ad7879_i2c_probe,
.remove = __devexit_p(ad7879_i2c_remove),
.suspend = ad7879_i2c_suspend,
.resume = ad7879_i2c_resume,
.id_table = ad7879_id,
};
static int __init ad7879_i2c_init(void)
{
return i2c_add_driver(&ad7879_i2c_driver);
}
module_init(ad7879_i2c_init);
static void __exit ad7879_i2c_exit(void)
{
i2c_del_driver(&ad7879_i2c_driver);
}
module_exit(ad7879_i2c_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("i2c:ad7879");

190
drivers/input/touchscreen/ad7879-spi.c Normal file
View File

@ -0,0 +1,190 @@
/*
* AD7879/AD7889 touchscreen (SPI bus)
*
* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/input.h> /* BUS_SPI */
#include <linux/spi/spi.h>
#include "ad7879.h"
#define AD7879_DEVID 0x7A /* AD7879/AD7889 */
#define MAX_SPI_FREQ_HZ 5000000
#define AD7879_CMD_MAGIC 0xE000
#define AD7879_CMD_READ (1 << 10)
#define AD7879_CMD(reg) (AD7879_CMD_MAGIC | ((reg) & 0xF))
#define AD7879_WRITECMD(reg) (AD7879_CMD(reg))
#define AD7879_READCMD(reg) (AD7879_CMD(reg) | AD7879_CMD_READ)
#ifdef CONFIG_PM
static int ad7879_spi_suspend(struct spi_device *spi, pm_message_t message)
{
struct ad7879 *ts = spi_get_drvdata(spi);
ad7879_disable(ts);
return 0;
}
static int ad7879_spi_resume(struct spi_device *spi)
{
struct ad7879 *ts = spi_get_drvdata(spi);
ad7879_enable(ts);
return 0;
}
#else
# define ad7879_spi_suspend NULL
# define ad7879_spi_resume NULL
#endif
/*
* ad7879_read/write are only used for initial setup and for sysfs controls.
* The main traffic is done in ad7879_collect().
*/
static int ad7879_spi_xfer(struct spi_device *spi,
u16 cmd, u8 count, u16 *tx_buf, u16 *rx_buf)
{
struct spi_message msg;
struct spi_transfer *xfers;
void *spi_data;
u16 *command;
u16 *_rx_buf = _rx_buf; /* shut gcc up */
u8 idx;
int ret;
xfers = spi_data = kzalloc(sizeof(*xfers) * (count + 2), GFP_KERNEL);
if (!spi_data)
return -ENOMEM;
spi_message_init(&msg);
command = spi_data;
command[0] = cmd;
if (count == 1) {
/* ad7879_spi_{read,write} gave us buf on stack */
command[1] = *tx_buf;
tx_buf = &command[1];
_rx_buf = rx_buf;
rx_buf = &command[2];
}
++xfers;
xfers[0].tx_buf = command;
xfers[0].len = 2;
spi_message_add_tail(&xfers[0], &msg);
++xfers;
for (idx = 0; idx < count; ++idx) {
if (rx_buf)
xfers[idx].rx_buf = &rx_buf[idx];
if (tx_buf)
xfers[idx].tx_buf = &tx_buf[idx];
xfers[idx].len = 2;
spi_message_add_tail(&xfers[idx], &msg);
}
ret = spi_sync(spi, &msg);
if (count == 1)
_rx_buf[0] = command[2];
kfree(spi_data);
return ret;
}
static int ad7879_spi_multi_read(struct device *dev,
u8 first_reg, u8 count, u16 *buf)
{
struct spi_device *spi = to_spi_device(dev);
return ad7879_spi_xfer(spi, AD7879_READCMD(first_reg), count, NULL, buf);
}
static int ad7879_spi_read(struct device *dev, u8 reg)
{
struct spi_device *spi = to_spi_device(dev);
u16 ret, dummy;
return ad7879_spi_xfer(spi, AD7879_READCMD(reg), 1, &dummy, &ret) ? : ret;
}
static int ad7879_spi_write(struct device *dev, u8 reg, u16 val)
{
struct spi_device *spi = to_spi_device(dev);
u16 dummy;
return ad7879_spi_xfer(spi, AD7879_WRITECMD(reg), 1, &val, &dummy);
}
static const struct ad7879_bus_ops ad7879_spi_bus_ops = {
.bustype = BUS_SPI,
.read = ad7879_spi_read,
.multi_read = ad7879_spi_multi_read,
.write = ad7879_spi_write,
};
static int __devinit ad7879_spi_probe(struct spi_device *spi)
{
struct ad7879 *ts;
/* don't exceed max specified SPI CLK frequency */
if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
return -EINVAL;
}
ts = ad7879_probe(&spi->dev, AD7879_DEVID, spi->irq, &ad7879_spi_bus_ops);
if (IS_ERR(ts))
return PTR_ERR(ts);
spi_set_drvdata(spi, ts);
return 0;
}
static int __devexit ad7879_spi_remove(struct spi_device *spi)
{
struct ad7879 *ts = spi_get_drvdata(spi);
ad7879_remove(ts);
spi_set_drvdata(spi, NULL);
return 0;
}
static struct spi_driver ad7879_spi_driver = {
.driver = {
.name = "ad7879",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ad7879_spi_probe,
.remove = __devexit_p(ad7879_spi_remove),
.suspend = ad7879_spi_suspend,
.resume = ad7879_spi_resume,
};
static int __init ad7879_spi_init(void)
{
return spi_register_driver(&ad7879_spi_driver);
}
module_init(ad7879_spi_init);
static void __exit ad7879_spi_exit(void)
{
spi_unregister_driver(&ad7879_spi_driver);
}
module_exit(ad7879_spi_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ad7879");

500
drivers/input/touchscreen/ad7879.c
View File

@ -1,25 +1,9 @@
/*
* Copyright (C) 2008-2009 Michael Hennerich, Analog Devices Inc.
* AD7879/AD7889 based touchscreen and GPIO driver
*
* Description: AD7879/AD7889 based touchscreen, and GPIO driver
* (I2C/SPI Interface)
* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* Licensed under the GPL-2 or later.
*
* History:
* Copyright (c) 2005 David Brownell
@ -49,6 +33,7 @@
#include <linux/gpio.h>
#include <linux/spi/ad7879.h>
#include "ad7879.h"
#define AD7879_REG_ZEROS 0
#define AD7879_REG_CTRL1 1
@ -119,29 +104,18 @@ enum {
#define MAX_12BIT ((1<<12)-1)
#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
#define AD7879_DEVID 0x7A
typedef struct spi_device bus_device;
#elif defined(CONFIG_TOUCHSCREEN_AD7879_I2C) || defined(CONFIG_TOUCHSCREEN_AD7879_I2C_MODULE)
#define AD7879_DEVID 0x79
typedef struct i2c_client bus_device;
#endif
struct ad7879 {
bus_device *bus;
const struct ad7879_bus_ops *bops;
struct device *dev;
struct input_dev *input;
struct timer_list timer;
#ifdef CONFIG_GPIOLIB
struct gpio_chip gc;
#endif
unsigned int irq;
struct mutex mutex;
bool disabled; /* P: mutex */
#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
struct spi_message msg;
struct spi_transfer xfer[AD7879_NR_SENSE + 1];
u16 cmd;
#endif
u16 conversion_data[AD7879_NR_SENSE];
char phys[32];
u8 first_conversion_delay;
@ -156,9 +130,20 @@ struct ad7879 {
u16 cmd_crtl3;
};
static int ad7879_read(bus_device *, u8);
static int ad7879_write(bus_device *, u8, u16);
static void ad7879_collect(struct ad7879 *);
static int ad7879_read(struct ad7879 *ts, u8 reg)
{
return ts->bops->read(ts->dev, reg);
}
static int ad7879_multi_read(struct ad7879 *ts, u8 first_reg, u8 count, u16 *buf)
{
return ts->bops->multi_read(ts->dev, first_reg, count, buf);
}
static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
{
return ts->bops->write(ts->dev, reg, val);
}
static void ad7879_report(struct ad7879 *ts)
{
@ -173,12 +158,14 @@ static void ad7879_report(struct ad7879 *ts)
/*
* The samples processed here are already preprocessed by the AD7879.
* The preprocessing function consists of a median and an averaging filter.
* The combination of these two techniques provides a robust solution,
* discarding the spurious noise in the signal and keeping only the data of interest.
* The size of both filters is programmable. (dev.platform_data, see linux/spi/ad7879.h)
* Other user-programmable conversion controls include variable acquisition time,
* and first conversion delay. Up to 16 averages can be taken per conversion.
* The preprocessing function consists of a median and an averaging
* filter. The combination of these two techniques provides a robust
* solution, discarding the spurious noise in the signal and keeping
* only the data of interest. The size of both filters is
* programmable. (dev.platform_data, see linux/spi/ad7879.h) Other
* user-programmable conversion controls include variable acquisition
* time, and first conversion delay. Up to 16 averages can be taken
* per conversion.
*/
if (likely(x && z1)) {
@ -213,7 +200,7 @@ static irqreturn_t ad7879_irq(int irq, void *handle)
{
struct ad7879 *ts = handle;
ad7879_collect(ts);
ad7879_multi_read(ts, AD7879_REG_XPLUS, AD7879_NR_SENSE, ts->conversion_data);
ad7879_report(ts);
mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
@ -223,42 +210,44 @@ static irqreturn_t ad7879_irq(int irq, void *handle)
static void ad7879_setup(struct ad7879 *ts)
{
ad7879_write(ts->bus, AD7879_REG_CTRL2, ts->cmd_crtl2);
ad7879_write(ts->bus, AD7879_REG_CTRL3, ts->cmd_crtl3);
ad7879_write(ts->bus, AD7879_REG_CTRL1, ts->cmd_crtl1);
ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
}
static void ad7879_disable(struct ad7879 *ts)
void ad7879_disable(struct ad7879 *ts)
{
mutex_lock(&ts->mutex);
if (!ts->disabled) {
ts->disabled = true;
disable_irq(ts->bus->irq);
disable_irq(ts->irq);
if (del_timer_sync(&ts->timer))
ad7879_ts_event_release(ts);
ad7879_write(ts->bus, AD7879_REG_CTRL2,
ad7879_write(ts, AD7879_REG_CTRL2,
AD7879_PM(AD7879_PM_SHUTDOWN));
}
mutex_unlock(&ts->mutex);
}
EXPORT_SYMBOL(ad7879_disable);
static void ad7879_enable(struct ad7879 *ts)
void ad7879_enable(struct ad7879 *ts)
{
mutex_lock(&ts->mutex);
if (ts->disabled) {
ad7879_setup(ts);
ts->disabled = false;
enable_irq(ts->bus->irq);
enable_irq(ts->irq);
}
mutex_unlock(&ts->mutex);
}
EXPORT_SYMBOL(ad7879_enable);
static ssize_t ad7879_disable_show(struct device *dev,
struct device_attribute *attr, char *buf)
@ -308,7 +297,7 @@ static int ad7879_gpio_direction_input(struct gpio_chip *chip,
mutex_lock(&ts->mutex);
ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL;
err = ad7879_write(ts->bus, AD7879_REG_CTRL2, ts->cmd_crtl2);
err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
mutex_unlock(&ts->mutex);
return err;
@ -328,7 +317,7 @@ static int ad7879_gpio_direction_output(struct gpio_chip *chip,
else
ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
err = ad7879_write(ts->bus, AD7879_REG_CTRL2, ts->cmd_crtl2);
err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
mutex_unlock(&ts->mutex);
return err;
@ -340,7 +329,7 @@ static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
u16 val;
mutex_lock(&ts->mutex);
val = ad7879_read(ts->bus, AD7879_REG_CTRL2);
val = ad7879_read(ts, AD7879_REG_CTRL2);
mutex_unlock(&ts->mutex);
return !!(val & AD7879_GPIO_DATA);
@ -357,14 +346,13 @@ static void ad7879_gpio_set_value(struct gpio_chip *chip,
else
ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
ad7879_write(ts->bus, AD7879_REG_CTRL2, ts->cmd_crtl2);
ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
mutex_unlock(&ts->mutex);
}
static int __devinit ad7879_gpio_add(struct device *dev)
static int ad7879_gpio_add(struct ad7879 *ts,
const struct ad7879_platform_data *pdata)
{
struct ad7879 *ts = dev_get_drvdata(dev);
struct ad7879_platform_data *pdata = dev->platform_data;
int ret = 0;
if (pdata->gpio_export) {
@ -377,72 +365,78 @@ static int __devinit ad7879_gpio_add(struct device *dev)
ts->gc.ngpio = 1;
ts->gc.label = "AD7879-GPIO";
ts->gc.owner = THIS_MODULE;
ts->gc.dev = dev;
ts->gc.dev = ts->dev;
ret = gpiochip_add(&ts->gc);
if (ret)
dev_err(dev, "failed to register gpio %d\n",
dev_err(ts->dev, "failed to register gpio %d\n",
ts->gc.base);
}
return ret;
}
/*
* We mark ad7879_gpio_remove inline so there is a chance the code
* gets discarded when not needed. We can't do __devinit/__devexit
* markup since it is used in both probe and remove methods.
*/
static inline void ad7879_gpio_remove(struct device *dev)
static void ad7879_gpio_remove(struct ad7879 *ts)
{
struct ad7879 *ts = dev_get_drvdata(dev);
struct ad7879_platform_data *pdata = dev->platform_data;
const struct ad7879_platform_data *pdata = ts->dev->platform_data;
int ret;
if (pdata->gpio_export) {
ret = gpiochip_remove(&ts->gc);
if (ret)
dev_err(dev, "failed to remove gpio %d\n",
dev_err(ts->dev, "failed to remove gpio %d\n",
ts->gc.base);
}
}
#else
static inline int ad7879_gpio_add(struct device *dev)
static inline int ad7879_gpio_add(struct ad7879 *ts,
const struct ad7879_platform_data *pdata)
{
return 0;
}
static inline void ad7879_gpio_remove(struct device *dev)
static inline void ad7879_gpio_remove(struct ad7879 *ts)
{
}
#endif
static int __devinit ad7879_construct(bus_device *bus, struct ad7879 *ts)
struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq,
const struct ad7879_bus_ops *bops)
{
struct ad7879_platform_data *pdata = dev->platform_data;
struct ad7879 *ts;
struct input_dev *input_dev;
struct ad7879_platform_data *pdata = bus->dev.platform_data;
int err;
u16 revid;
if (!bus->irq) {
dev_err(&bus->dev, "no IRQ?\n");
return -ENODEV;
if (!irq) {
dev_err(dev, "no IRQ?\n");
err = -EINVAL;
goto err_out;
}
if (!pdata) {
dev_err(&bus->dev, "no platform data?\n");
return -ENODEV;
dev_err(dev, "no platform data?\n");
err = -EINVAL;
goto err_out;
}
ts = kzalloc(sizeof(*ts), GFP_KERNEL);
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
if (!ts || !input_dev) {
err = -ENOMEM;
goto err_free_mem;
}
ts->bops = bops;
ts->dev = dev;
ts->input = input_dev;
setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts);
mutex_init(&ts->mutex);
ts->irq = irq;
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
ts->pressure_max = pdata->pressure_max ? : ~0;
@ -452,11 +446,12 @@ static int __devinit ad7879_construct(bus_device *bus, struct ad7879 *ts)
ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
ts->median = pdata->median;
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&bus->dev));
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
input_dev->name = "AD7879 Touchscreen";
input_dev->phys = ts->phys;
input_dev->dev.parent = &bus->dev;
input_dev->dev.parent = dev;
input_dev->id.bustype = bops->bustype;
__set_bit(EV_ABS, input_dev->evbit);
__set_bit(ABS_X, input_dev->absbit);
@ -474,17 +469,18 @@ static int __devinit ad7879_construct(bus_device *bus, struct ad7879 *ts)
input_set_abs_params(input_dev, ABS_PRESSURE,
pdata->pressure_min, pdata->pressure_max, 0, 0);
err = ad7879_write(bus, AD7879_REG_CTRL2, AD7879_RESET);
err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
if (err < 0) {
dev_err(&bus->dev, "Failed to write %s\n", input_dev->name);
dev_err(dev, "Failed to write %s\n", input_dev->name);
goto err_free_mem;
}
revid = ad7879_read(bus, AD7879_REG_REVID);
if ((revid & 0xFF) != AD7879_DEVID) {
dev_err(&bus->dev, "Failed to probe %s\n", input_dev->name);
revid = ad7879_read(ts, AD7879_REG_REVID);
input_dev->id.product = (revid & 0xff);
input_dev->id.version = revid >> 8;
if (input_dev->id.product != devid) {
dev_err(dev, "Failed to probe %s (%x vs %x)\n",
input_dev->name, devid, revid);
err = -ENODEV;
goto err_free_mem;
}
@ -508,19 +504,19 @@ static int __devinit ad7879_construct(bus_device *bus, struct ad7879 *ts)
ad7879_setup(ts);
err = request_threaded_irq(bus->irq, NULL, ad7879_irq,
err = request_threaded_irq(ts->irq, NULL, ad7879_irq,
IRQF_TRIGGER_FALLING,
bus->dev.driver->name, ts);
dev_name(dev), ts);
if (err) {
dev_err(&bus->dev, "irq %d busy?\n", bus->irq);
dev_err(dev, "irq %d busy?\n", ts->irq);
goto err_free_mem;
}
err = sysfs_create_group(&bus->dev.kobj, &ad7879_attr_group);
err = sysfs_create_group(&dev->kobj, &ad7879_attr_group);
if (err)
goto err_free_irq;
err = ad7879_gpio_add(&bus->dev);
err = ad7879_gpio_add(ts, pdata);
if (err)
goto err_remove_attr;
@ -528,321 +524,33 @@ static int __devinit ad7879_construct(bus_device *bus, struct ad7879 *ts)
if (err)
goto err_remove_gpio;
dev_info(&bus->dev, "Rev.%d touchscreen, irq %d\n",
revid >> 8, bus->irq);
return 0;
return ts;
err_remove_gpio:
ad7879_gpio_remove(&bus->dev);
ad7879_gpio_remove(ts);
err_remove_attr:
sysfs_remove_group(&bus->dev.kobj, &ad7879_attr_group);
sysfs_remove_group(&dev->kobj, &ad7879_attr_group);
err_free_irq:
free_irq(bus->irq, ts);
free_irq(ts->irq, ts);
err_free_mem:
input_free_device(input_dev);
return err;
kfree(ts);
err_out:
return ERR_PTR(err);
}
EXPORT_SYMBOL(ad7879_probe);
static int __devexit ad7879_destroy(bus_device *bus, struct ad7879 *ts)
void ad7879_remove(struct ad7879 *ts)
{
ad7879_gpio_remove(&bus->dev);
ad7879_gpio_remove(ts);
ad7879_disable(ts);
sysfs_remove_group(&ts->bus->dev.kobj, &ad7879_attr_group);
free_irq(ts->bus->irq, ts);
sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group);
free_irq(ts->irq, ts);
input_unregister_device(ts->input);
dev_dbg(&bus->dev, "unregistered touchscreen\n");
return 0;
}
#ifdef CONFIG_PM
static int ad7879_suspend(bus_device *bus, pm_message_t message)
{
struct ad7879 *ts = dev_get_drvdata(&bus->dev);
ad7879_disable(ts);
return 0;
}
static int ad7879_resume(bus_device *bus)
{
struct ad7879 *ts = dev_get_drvdata(&bus->dev);
ad7879_enable(ts);
return 0;
}
#else
#define ad7879_suspend NULL
#define ad7879_resume NULL
#endif
#if defined(CONFIG_TOUCHSCREEN_AD7879_SPI) || defined(CONFIG_TOUCHSCREEN_AD7879_SPI_MODULE)
#define MAX_SPI_FREQ_HZ 5000000
#define AD7879_CMD_MAGIC 0xE000
#define AD7879_CMD_READ (1 << 10)
#define AD7879_WRITECMD(reg) (AD7879_CMD_MAGIC | (reg & 0xF))
#define AD7879_READCMD(reg) (AD7879_CMD_MAGIC | AD7879_CMD_READ | (reg & 0xF))
struct ser_req {
u16 command;
u16 data;
struct spi_message msg;
struct spi_transfer xfer[2];
};
/*
* ad7879_read/write are only used for initial setup and for sysfs controls.
* The main traffic is done in ad7879_collect().
*/
static int ad7879_read(struct spi_device *spi, u8 reg)
{
struct ser_req *req;
int status, ret;
req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
spi_message_init(&req->msg);
req->command = (u16) AD7879_READCMD(reg);
req->xfer[0].tx_buf = &req->command;
req->xfer[0].len = 2;
req->xfer[1].rx_buf = &req->data;
req->xfer[1].len = 2;
spi_message_add_tail(&req->xfer[0], &req->msg);
spi_message_add_tail(&req->xfer[1], &req->msg);
status = spi_sync(spi, &req->msg);
ret = status ? : req->data;
kfree(req);
return ret;
}
static int ad7879_write(struct spi_device *spi, u8 reg, u16 val)
{
struct ser_req *req;
int status;
req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
spi_message_init(&req->msg);
req->command = (u16) AD7879_WRITECMD(reg);
req->xfer[0].tx_buf = &req->command;
req->xfer[0].len = 2;
req->data = val;
req->xfer[1].tx_buf = &req->data;
req->xfer[1].len = 2;
spi_message_add_tail(&req->xfer[0], &req->msg);
spi_message_add_tail(&req->xfer[1], &req->msg);
status = spi_sync(spi, &req->msg);
kfree(req);
return status;
}
static void ad7879_collect(struct ad7879 *ts)
{
int status = spi_sync(ts->bus, &ts->msg);
if (status)
dev_err(&ts->bus->dev, "spi_sync --> %d\n", status);
}
static void ad7879_setup_ts_def_msg(struct ad7879 *ts)
{
struct spi_message *m;
int i;
ts->cmd = (u16) AD7879_READCMD(AD7879_REG_XPLUS);
m = &ts->msg;
spi_message_init(m);
ts->xfer[0].tx_buf = &ts->cmd;
ts->xfer[0].len = 2;
spi_message_add_tail(&ts->xfer[0], m);
for (i = 0; i < AD7879_NR_SENSE; i++) {
ts->xfer[i + 1].rx_buf = &ts->conversion_data[i];
ts->xfer[i + 1].len = 2;
spi_message_add_tail(&ts->xfer[i + 1], m);
}
}
static int __devinit ad7879_probe(struct spi_device *spi)
{
struct ad7879 *ts;
int error;
/* don't exceed max specified SPI CLK frequency */
if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz);
return -EINVAL;
}
ts = kzalloc(sizeof(struct ad7879), GFP_KERNEL);
if (!ts)
return -ENOMEM;
dev_set_drvdata(&spi->dev, ts);
ts->bus = spi;
ad7879_setup_ts_def_msg(ts);
error = ad7879_construct(spi, ts);
if (error) {
dev_set_drvdata(&spi->dev, NULL);
kfree(ts);
}
return error;
}
static int __devexit ad7879_remove(struct spi_device *spi)
{
struct ad7879 *ts = dev_get_drvdata(&spi->dev);
ad7879_destroy(spi, ts);
dev_set_drvdata(&spi->dev, NULL);
kfree(ts);
return 0;
}
static struct spi_driver ad7879_driver = {
.driver = {
.name = "ad7879",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ad7879_probe,
.remove = __devexit_p(ad7879_remove),
.suspend = ad7879_suspend,
.resume = ad7879_resume,
};
static int __init ad7879_init(void)
{
return spi_register_driver(&ad7879_driver);
}
module_init(ad7879_init);
static void __exit ad7879_exit(void)
{
spi_unregister_driver(&ad7879_driver);
}
module_exit(ad7879_exit);
#elif defined(CONFIG_TOUCHSCREEN_AD7879_I2C) || defined(CONFIG_TOUCHSCREEN_AD7879_I2C_MODULE)
/* All registers are word-sized.
* AD7879 uses a high-byte first convention.
*/
static int ad7879_read(struct i2c_client *client, u8 reg)
{
return swab16(i2c_smbus_read_word_data(client, reg));
}
static int ad7879_write(struct i2c_client *client, u8 reg, u16 val)
{
return i2c_smbus_write_word_data(client, reg, swab16(val));
}
static void ad7879_collect(struct ad7879 *ts)
{
int i;
for (i = 0; i < AD7879_NR_SENSE; i++)
ts->conversion_data[i] = ad7879_read(ts->bus,
AD7879_REG_XPLUS + i);
}
static int __devinit ad7879_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ad7879 *ts;
int error;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WORD_DATA)) {
dev_err(&client->dev, "SMBUS Word Data not Supported\n");
return -EIO;
}
ts = kzalloc(sizeof(struct ad7879), GFP_KERNEL);
if (!ts)
return -ENOMEM;
i2c_set_clientdata(client, ts);
ts->bus = client;
error = ad7879_construct(client, ts);
if (error)
kfree(ts);
return error;
}
static int __devexit ad7879_remove(struct i2c_client *client)
{
struct ad7879 *ts = dev_get_drvdata(&client->dev);
ad7879_destroy(client, ts);
kfree(ts);
return 0;
}
static const struct i2c_device_id ad7879_id[] = {
{ "ad7879", 0 },
{ "ad7889", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ad7879_id);
static struct i2c_driver ad7879_driver = {
.driver = {
.name = "ad7879",
.owner = THIS_MODULE,
},
.probe = ad7879_probe,
.remove = __devexit_p(ad7879_remove),
.suspend = ad7879_suspend,
.resume = ad7879_resume,
.id_table = ad7879_id,
};
static int __init ad7879_init(void)
{
return i2c_add_driver(&ad7879_driver);
}
module_init(ad7879_init);
static void __exit ad7879_exit(void)
{
i2c_del_driver(&ad7879_driver);
}
module_exit(ad7879_exit);
#endif
EXPORT_SYMBOL(ad7879_remove);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ad7879");

30
drivers/input/touchscreen/ad7879.h Normal file
View File

@ -0,0 +1,30 @@
/*
* AD7879/AD7889 touchscreen (bus interfaces)
*
* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef _AD7879_H_
#define _AD7879_H_
#include <linux/types.h>
struct ad7879;
struct device;
struct ad7879_bus_ops {
u16 bustype;
int (*read)(struct device *dev, u8 reg);
int (*multi_read)(struct device *dev, u8 first_reg, u8 count, u16 *buf);
int (*write)(struct device *dev, u8 reg, u16 val);
};
void ad7879_disable(struct ad7879 *);
void ad7879_enable(struct ad7879 *);
struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned irq,
const struct ad7879_bus_ops *bops);
void ad7879_remove(struct ad7879 *);
#endif