--- /dev/null
+/*
+ * 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");
/*
- * 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
#include <linux/gpio.h>
#include <linux/spi/ad7879.h>
+#include "ad7879.h"
#define AD7879_REG_ZEROS 0
#define AD7879_REG_CTRL1 1
#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;
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)
{
/*
* 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)) {
{
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);
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)
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;
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;
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);
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) {
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;
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);
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;
}
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;
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");
git.openpandora.org / pandora-kernel.git / commitdiff