diff options
| -rw-r--r-- | drivers/input/touchscreen/Kconfig | 32 | ||||
| -rw-r--r-- | drivers/input/touchscreen/Makefile | 1 | ||||
| -rw-r--r-- | drivers/input/touchscreen/ad7879.c | 782 | ||||
| -rw-r--r-- | include/linux/spi/ad7879.h | 35 |
4 files changed, 850 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index afeb7554bfe..b01fd61dadc 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -42,6 +42,38 @@ 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 + help + Say Y here if you have a touchscreen interface using the + AD7879-1 controller, and your board-specific initialization + code includes that in its table of I2C devices. + + 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_SPI + tristate "AD7879 based touchscreens: AD7879 SPI Interface" + depends on SPI_MASTER && TOUCHSCREEN_AD7879_I2C = n + select TOUCHSCREEN_AD7879 + help + Say Y here if you have a touchscreen interface using the + AD7879 controller, and your board-specific initialization + code includes that in its table of SPI devices. + + 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 + config TOUCHSCREEN_BITSY tristate "Compaq iPAQ H3600 (Bitsy) touchscreen" depends on SA1100_BITSY diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 45dfcd61be1..6700f7b9d16 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -7,6 +7,7 @@ wm97xx-ts-y := wm97xx-core.o obj-$(CONFIG_TOUCHSCREEN_AD7877) += ad7877.o +obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c new file mode 100644 index 00000000000..ea4c61d6868 --- /dev/null +++ b/drivers/input/touchscreen/ad7879.c @@ -0,0 +1,782 @@ +/* + * Copyright (C) 2008 Michael Hennerich, Analog Devices Inc. + * + * Description: AD7879 based touchscreen, and GPIO driver (I2C/SPI Interface) + * + * 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 + * + * History: + * Copyright (c) 2005 David Brownell + * Copyright (c) 2006 Nokia Corporation + * Various changes: Imre Deak <imre.deak@nokia.com> + * + * Using code from: + * - 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 + * - ad7877.c + * Copyright (C) 2006-2008 Analog Devices Inc. + */ + +#include <linux/device.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include <linux/spi/spi.h> +#include <linux/i2c.h> + +#include <linux/spi/ad7879.h> + +#define AD7879_REG_ZEROS 0 +#define AD7879_REG_CTRL1 1 +#define AD7879_REG_CTRL2 2 +#define AD7879_REG_CTRL3 3 +#define AD7879_REG_AUX1HIGH 4 +#define AD7879_REG_AUX1LOW 5 +#define AD7879_REG_TEMP1HIGH 6 +#define AD7879_REG_TEMP1LOW 7 +#define AD7879_REG_XPLUS 8 +#define AD7879_REG_YPLUS 9 +#define AD7879_REG_Z1 10 +#define AD7879_REG_Z2 11 +#define AD7879_REG_AUXVBAT 12 +#define AD7879_REG_TEMP 13 +#define AD7879_REG_REVID 14 + +/* Control REG 1 */ +#define AD7879_TMR(x) ((x & 0xFF) << 0) +#define AD7879_ACQ(x) ((x & 0x3) << 8) +#define AD7879_MODE_NOC (0 << 10) /* Do not convert */ +#define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */ +#define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */ +#define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */ +#define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */ + +/* Control REG 2 */ +#define AD7879_FCD(x) ((x & 0x3) << 0) +#define AD7879_RESET (1 << 4) +#define AD7879_MFS(x) ((x & 0x3) << 5) +#define AD7879_AVG(x) ((x & 0x3) << 7) +#define AD7879_SER (1 << 9) /* non-differential */ +#define AD7879_DFR (0 << 9) /* differential */ +#define AD7879_GPIOPOL (1 << 10) +#define AD7879_GPIODIR (1 << 11) +#define AD7879_GPIO_DATA (1 << 12) +#define AD7879_GPIO_EN (1 << 13) +#define AD7879_PM(x) ((x & 0x3) << 14) +#define AD7879_PM_SHUTDOWN (0) +#define AD7879_PM_DYN (1) +#define AD7879_PM_FULLON (2) + +/* Control REG 3 */ +#define AD7879_TEMPMASK_BIT (1<<15) +#define AD7879_AUXVBATMASK_BIT (1<<14) +#define AD7879_INTMODE_BIT (1<<13) +#define AD7879_GPIOALERTMASK_BIT (1<<12) +#define AD7879_AUXLOW_BIT (1<<11) +#define AD7879_AUXHIGH_BIT (1<<10) +#define AD7879_TEMPLOW_BIT (1<<9) +#define AD7879_TEMPHIGH_BIT (1<<8) +#define AD7879_YPLUS_BIT (1<<7) +#define AD7879_XPLUS_BIT (1<<6) +#define AD7879_Z1_BIT (1<<5) +#define AD7879_Z2_BIT (1<<4) +#define AD7879_AUX_BIT (1<<3) +#define AD7879_VBAT_BIT (1<<2) +#define AD7879_TEMP_BIT (1<<1) + +enum { + AD7879_SEQ_XPOS = 0, + AD7879_SEQ_YPOS = 1, + AD7879_SEQ_Z1 = 2, + AD7879_SEQ_Z2 = 3, + AD7879_NR_SENSE = 4, +}; + +#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; + struct input_dev *input; + struct work_struct work; + struct timer_list timer; + + struct mutex mutex; + unsigned disabled:1; /* 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; + u8 acquisition_time; + u8 averaging; + u8 pen_down_acc_interval; + u8 median; + u16 x_plate_ohms; + u16 pressure_max; + u16 gpio_init; + u16 cmd_crtl1; + u16 cmd_crtl2; + u16 cmd_crtl3; + unsigned gpio:1; +}; + +static int ad7879_read(bus_device *, u8); +static int ad7879_write(bus_device *, u8, u16); +static void ad7879_collect(struct ad7879 *); + +static void ad7879_report(struct ad7879 *ts) +{ + struct input_dev *input_dev = ts->input; + unsigned Rt; + u16 x, y, z1, z2; + + x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT; + y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT; + z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT; + z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT; + + /* + * 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. + */ + + if (likely(x && z1)) { + /* compute touch pressure resistance using equation #1 */ + Rt = (z2 - z1) * x * ts->x_plate_ohms; + Rt /= z1; + Rt = (Rt + 2047) >> 12; + + input_report_abs(input_dev, ABS_X, x); + input_report_abs(input_dev, ABS_Y, y); + input_report_abs(input_dev, ABS_PRESSURE, Rt); + input_sync(input_dev); + } +} + +static void ad7879_work(struct work_struct *work) +{ + struct ad7879 *ts = container_of(work, struct ad7879, work); + + /* use keventd context to read the result registers */ + ad7879_collect(ts); + ad7879_report(ts); + mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); +} + +static void ad7879_ts_event_release(struct ad7879 *ts) +{ + struct input_dev *input_dev = ts->input; + + input_report_abs(input_dev, ABS_PRESSURE, 0); + input_sync(input_dev); +} + +static void ad7879_timer(unsigned long handle) +{ + struct ad7879 *ts = (void *)handle; + + ad7879_ts_event_release(ts); +} + +static irqreturn_t ad7879_irq(int irq, void *handle) +{ + struct ad7879 *ts = handle; + + /* The repeated conversion sequencer controlled by TMR kicked off too fast. + * We ignore the last and process the sample sequence currently in the queue. + * It can't be older than 9.4ms + */ + + if (!work_pending(&ts->work)) + schedule_work(&ts->work); + + return IRQ_HANDLED; +} + +static void ad7879_setup(struct ad7879 *ts) +{ + ts->cmd_crtl3 = AD7879_YPLUS_BIT | + AD7879_XPLUS_BIT | + AD7879_Z2_BIT | + AD7879_Z1_BIT | + AD7879_TEMPMASK_BIT | + AD7879_AUXVBATMASK_BIT | + AD7879_GPIOALERTMASK_BIT; + + ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR | + AD7879_AVG(ts->averaging) | + AD7879_MFS(ts->median) | + AD7879_FCD(ts->first_conversion_delay) | + ts->gpio_init; + + ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 | + AD7879_ACQ(ts->acquisition_time) | + AD7879_TMR(ts->pen_down_acc_interval); + + 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); +} + +static void ad7879_disable(struct ad7879 *ts) +{ + mutex_lock(&ts->mutex); + + if (!ts->disabled) { + + ts->disabled = 1; + disable_irq(ts->bus->irq); + + cancel_work_sync(&ts->work); + + if (del_timer_sync(&ts->timer)) + ad7879_ts_event_release(ts); + + ad7879_write(ts->bus, AD7879_REG_CTRL2, + AD7879_PM(AD7879_PM_SHUTDOWN)); + } + + mutex_unlock(&ts->mutex); +} + +static void ad7879_enable(struct ad7879 *ts) +{ + mutex_lock(&ts->mutex); + + if (ts->disabled) { + ad7879_setup(ts); + ts->disabled = 0; + enable_irq(ts->bus->irq); + } + + mutex_unlock(&ts->mutex); +} + +static ssize_t ad7879_disable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ad7879 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->disabled); +} + +static ssize_t ad7879_disable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ad7879 *ts = dev_get_drvdata(dev); + unsigned long val; + int error; + + error = strict_strtoul(buf, 10, &val); + if (error) + return error; + + if (val) + ad7879_disable(ts); + else + ad7879_enable(ts); + + return count; +} + +static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store); + +static ssize_t ad7879_gpio_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ad7879 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->gpio); +} + +static ssize_t ad7879_gpio_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ad7879 *ts = dev_get_drvdata(dev); + unsigned long val; + int error; + + error = strict_strtoul(buf, 10, &val); + if (error) + return error; + + mutex_lock(&ts->mutex); + ts->gpio = !!val; + error = ad7879_write(ts->bus, AD7879_REG_CTRL2, + ts->gpio ? + ts->cmd_crtl2 & ~AD7879_GPIO_DATA : + ts->cmd_crtl2 | AD7879_GPIO_DATA); + mutex_unlock(&ts->mutex); + + return error ? : count; +} + +static DEVICE_ATTR(gpio, 0664, ad7879_gpio_show, ad7879_gpio_store); + +static struct attribute *ad7879_attributes[] = { + &dev_attr_disable.attr, + &dev_attr_gpio.attr, + NULL +}; + +static const struct attribute_group ad7879_attr_group = { + .attrs = ad7879_attributes, +}; + +static int __devinit ad7879_construct(bus_device *bus, 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 (!pdata) { + dev_err(&bus->dev, "no platform data?\n"); + return -ENODEV; + } + + input_dev = input_allocate_device(); + if (!input_dev) + return -ENOMEM; + + ts->input = input_dev; + + setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts); + INIT_WORK(&ts->work, ad7879_work); + mutex_init(&ts->mutex); + + ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; + ts->pressure_max = pdata->pressure_max ? : ~0; + + ts->first_conversion_delay = pdata->first_conversion_delay; + ts->acquisition_time = pdata->acquisition_time; + ts->averaging = pdata->averaging; + ts->pen_down_acc_interval = pdata->pen_down_acc_interval; + ts->median = pdata->median; + + if (pdata->gpio_output) + ts->gpio_init = AD7879_GPIO_EN | + (pdata->gpio_default ? 0 : AD7879_GPIO_DATA); + else + ts->gpio_init = AD7879_GPIO_EN | AD7879_GPIODIR; + + snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&bus->dev)); + + input_dev->name = "AD7879 Touchscreen"; + input_dev->phys = ts->phys; + input_dev->dev.parent = &bus->dev; + + __set_bit(EV_ABS, input_dev->evbit); + __set_bit(ABS_X, input_dev->absbit); + __set_bit(ABS_Y, input_dev->absbit); + __set_bit(ABS_PRESSURE, input_dev->absbit); + + input_set_abs_params(input_dev, ABS_X, + pdata->x_min ? : 0, + pdata->x_max ? : MAX_12BIT, + 0, 0); + input_set_abs_params(input_dev, ABS_Y, + pdata->y_min ? : 0, + pdata->y_max ? : MAX_12BIT, + 0, 0); + 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); + + if (err < 0) { + dev_err(&bus->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); + err = -ENODEV; + goto err_free_mem; + } + + ad7879_setup(ts); + + err = request_irq(bus->irq, ad7879_irq, + IRQF_TRIGGER_FALLING | IRQF_SAMPLE_RANDOM, + bus->dev.driver->name, ts); + + if (err) { + dev_err(&bus->dev, "irq %d busy?\n", bus->irq); + goto err_free_mem; + } + + err = sysfs_create_group(&bus->dev.kobj, &ad7879_attr_group); + if (err) + goto err_free_irq; + + err = input_register_device(input_dev); + if (err) + goto err_remove_attr; + + dev_info(&bus->dev, "Rev.%d touchscreen, irq %d\n", + revid >> 8, bus->irq); + + return 0; + +err_remove_attr: + sysfs_remove_group(&bus->dev.kobj, &ad7879_attr_group); +err_free_irq: + free_irq(bus->irq, ts); +err_free_mem: + input_free_device(input_dev); + + return err; +} + +static int __devexit ad7879_destroy(bus_device *bus, struct ad7879 *ts) +{ + ad7879_disable(ts); + sysfs_remove_group(&ts->bus->dev.kobj, &ad7879_attr_group); + free_irq(ts->bus->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 0; +} + +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) { + i2c_set_clientdata(client, NULL); + kfree(ts); + } + + return 0; +} + +static int __devexit ad7879_remove(struct i2c_client *client) +{ + struct ad7879 *ts = dev_get_drvdata(&client->dev); + + ad7879_destroy(client, ts); + i2c_set_clientdata(client, NULL); + kfree(ts); + + return 0; +} + +static const struct i2c_device_id ad7879_id[] = { + { "ad7879", 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 + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/spi/ad7879.h b/include/linux/spi/ad7879.h new file mode 100644 index 00000000000..4231104c9af --- /dev/null +++ b/include/linux/spi/ad7879.h @@ -0,0 +1,35 @@ +/* linux/spi/ad7879.h */ + +/* Touchscreen characteristics vary between boards and models. The + * platform_data for the device's "struct device" holds this information. + * + * It's OK if the min/max values are zero. + */ +struct ad7879_platform_data { + u16 model; /* 7879 */ + u16 x_plate_ohms; + u16 x_min, x_max; + u16 y_min, y_max; + u16 pressure_min, pressure_max; + + /* [0..255] 0=OFF Starts at 1=550us and goes + * all the way to 9.440ms in steps of 35us. + */ + u8 pen_down_acc_interval; + /* [0..15] Starts at 0=128us and goes all the + * way to 4.096ms in steps of 128us. + */ + u8 first_conversion_delay; + /* [0..3] 0 = 2us, 1 = 4us, 2 = 8us, 3 = 16us */ + u8 acquisition_time; + /* [0..3] Average X middle samples 0 = 2, 1 = 4, 2 = 8, 3 = 16 */ + u8 averaging; + /* [0..3] Perform X measurements 0 = OFF, + * 1 = 4, 2 = 8, 3 = 16 (median > averaging) + */ + u8 median; + /* 1 = AUX/VBAT/GPIO set to GPIO Output */ + u8 gpio_output; + /* Initial GPIO pin state (valid if gpio_output = 1) */ + u8 gpio_default; +}; |