diff options
Diffstat (limited to 'drivers/input/touchscreen/ad7879.c')
| -rw-r--r-- | drivers/input/touchscreen/ad7879.c | 500 |
1 files changed, 104 insertions, 396 deletions
diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c index f947457c858b..1de19691c4a3 100644 --- a/drivers/input/touchscreen/ad7879.c +++ b/drivers/input/touchscreen/ad7879.c @@ -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"); |
