diff options
Diffstat (limited to 'drivers/input/touchscreen/ad7877.c')
| -rw-r--r-- | drivers/input/touchscreen/ad7877.c | 844 |
1 files changed, 844 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ad7877.c b/drivers/input/touchscreen/ad7877.c new file mode 100644 index 000000000000..e4728a28f492 --- /dev/null +++ b/drivers/input/touchscreen/ad7877.c @@ -0,0 +1,844 @@ +/* + * Copyright (C) 2006-2008 Michael Hennerich, Analog Devices Inc. + * + * Description: AD7877 based touchscreen, sensor (ADCs), DAC and GPIO driver + * Based on: ads7846.c + * + * 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 + */ + + +#include <linux/device.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/spi/spi.h> +#include <linux/spi/ad7877.h> +#include <asm/irq.h> + +#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50) + +#define MAX_SPI_FREQ_HZ 20000000 +#define MAX_12BIT ((1<<12)-1) + +#define AD7877_REG_ZEROS 0 +#define AD7877_REG_CTRL1 1 +#define AD7877_REG_CTRL2 2 +#define AD7877_REG_ALERT 3 +#define AD7877_REG_AUX1HIGH 4 +#define AD7877_REG_AUX1LOW 5 +#define AD7877_REG_BAT1HIGH 6 +#define AD7877_REG_BAT1LOW 7 +#define AD7877_REG_BAT2HIGH 8 +#define AD7877_REG_BAT2LOW 9 +#define AD7877_REG_TEMP1HIGH 10 +#define AD7877_REG_TEMP1LOW 11 +#define AD7877_REG_SEQ0 12 +#define AD7877_REG_SEQ1 13 +#define AD7877_REG_DAC 14 +#define AD7877_REG_NONE1 15 +#define AD7877_REG_EXTWRITE 15 +#define AD7877_REG_XPLUS 16 +#define AD7877_REG_YPLUS 17 +#define AD7877_REG_Z2 18 +#define AD7877_REG_aux1 19 +#define AD7877_REG_aux2 20 +#define AD7877_REG_aux3 21 +#define AD7877_REG_bat1 22 +#define AD7877_REG_bat2 23 +#define AD7877_REG_temp1 24 +#define AD7877_REG_temp2 25 +#define AD7877_REG_Z1 26 +#define AD7877_REG_GPIOCTRL1 27 +#define AD7877_REG_GPIOCTRL2 28 +#define AD7877_REG_GPIODATA 29 +#define AD7877_REG_NONE2 30 +#define AD7877_REG_NONE3 31 + +#define AD7877_SEQ_YPLUS_BIT (1<<11) +#define AD7877_SEQ_XPLUS_BIT (1<<10) +#define AD7877_SEQ_Z2_BIT (1<<9) +#define AD7877_SEQ_AUX1_BIT (1<<8) +#define AD7877_SEQ_AUX2_BIT (1<<7) +#define AD7877_SEQ_AUX3_BIT (1<<6) +#define AD7877_SEQ_BAT1_BIT (1<<5) +#define AD7877_SEQ_BAT2_BIT (1<<4) +#define AD7877_SEQ_TEMP1_BIT (1<<3) +#define AD7877_SEQ_TEMP2_BIT (1<<2) +#define AD7877_SEQ_Z1_BIT (1<<1) + +enum { + AD7877_SEQ_YPOS = 0, + AD7877_SEQ_XPOS = 1, + AD7877_SEQ_Z2 = 2, + AD7877_SEQ_AUX1 = 3, + AD7877_SEQ_AUX2 = 4, + AD7877_SEQ_AUX3 = 5, + AD7877_SEQ_BAT1 = 6, + AD7877_SEQ_BAT2 = 7, + AD7877_SEQ_TEMP1 = 8, + AD7877_SEQ_TEMP2 = 9, + AD7877_SEQ_Z1 = 10, + AD7877_NR_SENSE = 11, +}; + +/* DAC Register Default RANGE 0 to Vcc, Volatge Mode, DAC On */ +#define AD7877_DAC_CONF 0x1 + +/* If gpio3 is set AUX3/GPIO3 acts as GPIO Output */ +#define AD7877_EXTW_GPIO_3_CONF 0x1C4 +#define AD7877_EXTW_GPIO_DATA 0x200 + +/* Control REG 2 */ +#define AD7877_TMR(x) ((x & 0x3) << 0) +#define AD7877_REF(x) ((x & 0x1) << 2) +#define AD7877_POL(x) ((x & 0x1) << 3) +#define AD7877_FCD(x) ((x & 0x3) << 4) +#define AD7877_PM(x) ((x & 0x3) << 6) +#define AD7877_ACQ(x) ((x & 0x3) << 8) +#define AD7877_AVG(x) ((x & 0x3) << 10) + +/* Control REG 1 */ +#define AD7877_SER (1 << 11) /* non-differential */ +#define AD7877_DFR (0 << 11) /* differential */ + +#define AD7877_MODE_NOC (0) /* Do not convert */ +#define AD7877_MODE_SCC (1) /* Single channel conversion */ +#define AD7877_MODE_SEQ0 (2) /* Sequence 0 in Slave Mode */ +#define AD7877_MODE_SEQ1 (3) /* Sequence 1 in Master Mode */ + +#define AD7877_CHANADD(x) ((x&0xF)<<7) +#define AD7877_READADD(x) ((x)<<2) +#define AD7877_WRITEADD(x) ((x)<<12) + +#define AD7877_READ_CHAN(x) (AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_SER | \ + AD7877_MODE_SCC | AD7877_CHANADD(AD7877_REG_ ## x) | \ + AD7877_READADD(AD7877_REG_ ## x)) + +#define AD7877_MM_SEQUENCE (AD7877_SEQ_YPLUS_BIT | AD7877_SEQ_XPLUS_BIT | \ + AD7877_SEQ_Z2_BIT | AD7877_SEQ_Z1_BIT) + +/* + * Non-touchscreen sensors only use single-ended conversions. + */ + +struct ser_req { + u16 reset; + u16 ref_on; + u16 command; + u16 sample; + struct spi_message msg; + struct spi_transfer xfer[6]; +}; + +struct ad7877 { + struct input_dev *input; + char phys[32]; + + struct spi_device *spi; + u16 model; + u16 vref_delay_usecs; + u16 x_plate_ohms; + u16 pressure_max; + + u16 cmd_crtl1; + u16 cmd_crtl2; + u16 cmd_dummy; + u16 dac; + + u8 stopacq_polarity; + u8 first_conversion_delay; + u8 acquisition_time; + u8 averaging; + u8 pen_down_acc_interval; + + u16 conversion_data[AD7877_NR_SENSE]; + + struct spi_transfer xfer[AD7877_NR_SENSE + 2]; + struct spi_message msg; + + struct mutex mutex; + unsigned disabled:1; /* P: mutex */ + unsigned gpio3:1; /* P: mutex */ + unsigned gpio4:1; /* P: mutex */ + + spinlock_t lock; + struct timer_list timer; /* P: lock */ + unsigned pending:1; /* P: lock */ +}; + +static int gpio3; +module_param(gpio3, int, 0); +MODULE_PARM_DESC(gpio3, "If gpio3 is set to 1 AUX3 acts as GPIO3"); + +/* + * ad7877_read/write are only used for initial setup and for sysfs controls. + * The main traffic is done using spi_async() in the interrupt handler. + */ + +static int ad7877_read(struct spi_device *spi, u16 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) (AD7877_WRITEADD(AD7877_REG_CTRL1) | + AD7877_READADD(reg)); + req->xfer[0].tx_buf = &req->command; + req->xfer[0].len = 2; + + req->xfer[1].rx_buf = &req->sample; + 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->sample; + + kfree(req); + + return ret; +} + +static int ad7877_write(struct spi_device *spi, u16 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) (AD7877_WRITEADD(reg) | (val & MAX_12BIT)); + req->xfer[0].tx_buf = &req->command; + req->xfer[0].len = 2; + + spi_message_add_tail(&req->xfer[0], &req->msg); + + status = spi_sync(spi, &req->msg); + + kfree(req); + + return status; +} + +static int ad7877_read_adc(struct spi_device *spi, unsigned command) +{ + struct ad7877 *ts = dev_get_drvdata(&spi->dev); + struct ser_req *req; + int status; + int sample; + int i; + + req = kzalloc(sizeof *req, GFP_KERNEL); + if (!req) + return -ENOMEM; + + spi_message_init(&req->msg); + + /* activate reference, so it has time to settle; */ + req->ref_on = AD7877_WRITEADD(AD7877_REG_CTRL2) | + AD7877_POL(ts->stopacq_polarity) | + AD7877_AVG(0) | AD7877_PM(2) | AD7877_TMR(0) | + AD7877_ACQ(ts->acquisition_time) | AD7877_FCD(0); + + req->reset = AD7877_WRITEADD(AD7877_REG_CTRL1) | AD7877_MODE_NOC; + + req->command = (u16) command; + + req->xfer[0].tx_buf = &req->reset; + req->xfer[0].len = 2; + + req->xfer[1].tx_buf = &req->ref_on; + req->xfer[1].len = 2; + req->xfer[1].delay_usecs = ts->vref_delay_usecs; + + req->xfer[2].tx_buf = &req->command; + req->xfer[2].len = 2; + req->xfer[2].delay_usecs = ts->vref_delay_usecs; + + req->xfer[3].rx_buf = &req->sample; + req->xfer[3].len = 2; + + req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/ + req->xfer[4].len = 2; + + req->xfer[5].tx_buf = &ts->cmd_crtl1; /*DEFAULT*/ + req->xfer[5].len = 2; + + /* group all the transfers together, so we can't interfere with + * reading touchscreen state; disable penirq while sampling + */ + for (i = 0; i < 6; i++) + spi_message_add_tail(&req->xfer[i], &req->msg); + + status = spi_sync(spi, &req->msg); + sample = req->sample; + + kfree(req); + + return status ? : sample; +} + +static void ad7877_rx(struct ad7877 *ts) +{ + struct input_dev *input_dev = ts->input; + unsigned Rt; + u16 x, y, z1, z2; + + x = ts->conversion_data[AD7877_SEQ_XPOS] & MAX_12BIT; + y = ts->conversion_data[AD7877_SEQ_YPOS] & MAX_12BIT; + z1 = ts->conversion_data[AD7877_SEQ_Z1] & MAX_12BIT; + z2 = ts->conversion_data[AD7877_SEQ_Z2] & MAX_12BIT; + + /* + * The samples processed here are already preprocessed by the AD7877. + * The preprocessing function consists of an averaging filter. + * The combination of 'first conversion delay' and averaging provides a robust solution, + * discarding the spurious noise in the signal and keeping only the data of interest. + * The size of the averaging filter is programmable. (dev.platform_data, see linux/spi/ad7877.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 inline void ad7877_ts_event_release(struct ad7877 *ts) +{ + struct input_dev *input_dev = ts->input; + + input_report_abs(input_dev, ABS_PRESSURE, 0); + input_sync(input_dev); +} + +static void ad7877_timer(unsigned long handle) +{ + struct ad7877 *ts = (void *)handle; + + ad7877_ts_event_release(ts); +} + +static irqreturn_t ad7877_irq(int irq, void *handle) +{ + struct ad7877 *ts = handle; + unsigned long flags; + int status; + + /* + * 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, and we + * need to avoid that ts->msg doesn't get issued twice while in work. + */ + + spin_lock_irqsave(&ts->lock, flags); + if (!ts->pending) { + ts->pending = 1; + + status = spi_async(ts->spi, &ts->msg); + if (status) + dev_err(&ts->spi->dev, "spi_sync --> %d\n", status); + } + spin_unlock_irqrestore(&ts->lock, flags); + + return IRQ_HANDLED; +} + +static void ad7877_callback(void *_ts) +{ + struct ad7877 *ts = _ts; + + spin_lock_irq(&ts->lock); + + ad7877_rx(ts); + ts->pending = 0; + mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); + + spin_unlock_irq(&ts->lock); +} + +static void ad7877_disable(struct ad7877 *ts) +{ + mutex_lock(&ts->mutex); + + if (!ts->disabled) { + ts->disabled = 1; + disable_irq(ts->spi->irq); + + /* Wait for spi_async callback */ + while (ts->pending) + msleep(1); + + if (del_timer_sync(&ts->timer)) + ad7877_ts_event_release(ts); + } + + /* we know the chip's in lowpower mode since we always + * leave it that way after every request + */ + + mutex_unlock(&ts->mutex); +} + +static void ad7877_enable(struct ad7877 *ts) +{ + mutex_lock(&ts->mutex); + + if (ts->disabled) { + ts->disabled = 0; + enable_irq(ts->spi->irq); + } + + mutex_unlock(&ts->mutex); +} + +#define SHOW(name) static ssize_t \ +name ## _show(struct device *dev, struct device_attribute *attr, char *buf) \ +{ \ + struct ad7877 *ts = dev_get_drvdata(dev); \ + ssize_t v = ad7877_read_adc(ts->spi, \ + AD7877_READ_CHAN(name)); \ + if (v < 0) \ + return v; \ + return sprintf(buf, "%u\n", (unsigned) v); \ +} \ +static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL); + +SHOW(aux1) +SHOW(aux2) +SHOW(aux3) +SHOW(bat1) +SHOW(bat2) +SHOW(temp1) +SHOW(temp2) + +static ssize_t ad7877_disable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ad7877 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->disabled); +} + +static ssize_t ad7877_disable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ad7877 *ts = dev_get_drvdata(dev); + unsigned long val; + int error; + + error = strict_strtoul(buf, 10, &val); + if (error) + return error; + + if (val) + ad7877_disable(ts); + else + ad7877_enable(ts); + + return count; +} + +static DEVICE_ATTR(disable, 0664, ad7877_disable_show, ad7877_disable_store); + +static ssize_t ad7877_dac_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ad7877 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->dac); +} + +static ssize_t ad7877_dac_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ad7877 *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->dac = val & 0xFF; + ad7877_write(ts->spi, AD7877_REG_DAC, (ts->dac << 4) | AD7877_DAC_CONF); + mutex_unlock(&ts->mutex); + + return count; +} + +static DEVICE_ATTR(dac, 0664, ad7877_dac_show, ad7877_dac_store); + +static ssize_t ad7877_gpio3_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ad7877 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->gpio3); +} + +static ssize_t ad7877_gpio3_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ad7877 *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->gpio3 = !!val; + ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | + (ts->gpio4 << 4) | (ts->gpio3 << 5)); + mutex_unlock(&ts->mutex); + + return count; +} + +static DEVICE_ATTR(gpio3, 0664, ad7877_gpio3_show, ad7877_gpio3_store); + +static ssize_t ad7877_gpio4_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ad7877 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->gpio4); +} + +static ssize_t ad7877_gpio4_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ad7877 *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->gpio4 = !!val; + ad7877_write(ts->spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_DATA | + (ts->gpio4 << 4) | (ts->gpio3 << 5)); + mutex_unlock(&ts->mutex); + + return count; +} + +static DEVICE_ATTR(gpio4, 0664, ad7877_gpio4_show, ad7877_gpio4_store); + +static struct attribute *ad7877_attributes[] = { + &dev_attr_temp1.attr, + &dev_attr_temp2.attr, + &dev_attr_aux1.attr, + &dev_attr_aux2.attr, + &dev_attr_bat1.attr, + &dev_attr_bat2.attr, + &dev_attr_disable.attr, + &dev_attr_dac.attr, + &dev_attr_gpio4.attr, + NULL +}; + +static const struct attribute_group ad7877_attr_group = { + .attrs = ad7877_attributes, +}; + +static void ad7877_setup_ts_def_msg(struct spi_device *spi, struct ad7877 *ts) +{ + struct spi_message *m; + int i; + + ts->cmd_crtl2 = AD7877_WRITEADD(AD7877_REG_CTRL2) | + AD7877_POL(ts->stopacq_polarity) | + AD7877_AVG(ts->averaging) | AD7877_PM(1) | + AD7877_TMR(ts->pen_down_acc_interval) | + AD7877_ACQ(ts->acquisition_time) | + AD7877_FCD(ts->first_conversion_delay); + + ad7877_write(spi, AD7877_REG_CTRL2, ts->cmd_crtl2); + + ts->cmd_crtl1 = AD7877_WRITEADD(AD7877_REG_CTRL1) | + AD7877_READADD(AD7877_REG_XPLUS-1) | + AD7877_MODE_SEQ1 | AD7877_DFR; + + ad7877_write(spi, AD7877_REG_CTRL1, ts->cmd_crtl1); + + ts->cmd_dummy = 0; + + m = &ts->msg; + + spi_message_init(m); + + m->complete = ad7877_callback; + m->context = ts; + + ts->xfer[0].tx_buf = &ts->cmd_crtl1; + ts->xfer[0].len = 2; + + spi_message_add_tail(&ts->xfer[0], m); + + ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */ + ts->xfer[1].len = 2; + + spi_message_add_tail(&ts->xfer[1], m); + + for (i = 0; i < 11; i++) { + ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i]; + ts->xfer[i + 2].len = 2; + spi_message_add_tail(&ts->xfer[i + 2], m); + } +} + +static int __devinit ad7877_probe(struct spi_device *spi) +{ + struct ad7877 *ts; + struct input_dev *input_dev; + struct ad7877_platform_data *pdata = spi->dev.platform_data; + int err; + u16 verify; + + if (!spi->irq) { + dev_dbg(&spi->dev, "no IRQ?\n"); + return -ENODEV; + } + + if (!pdata) { + dev_dbg(&spi->dev, "no platform data?\n"); + return -ENODEV; + } + + /* don't exceed max specified SPI CLK frequency */ + if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { + dev_dbg(&spi->dev, "SPI CLK %d Hz?\n",spi->max_speed_hz); + return -EINVAL; + } + + ts = kzalloc(sizeof(struct ad7877), GFP_KERNEL); + input_dev = input_allocate_device(); + if (!ts || !input_dev) { + err = -ENOMEM; + goto err_free_mem; + } + + dev_set_drvdata(&spi->dev, ts); + ts->spi = spi; + ts->input = input_dev; + + setup_timer(&ts->timer, ad7877_timer, (unsigned long) ts); + mutex_init(&ts->mutex); + spin_lock_init(&ts->lock); + + ts->model = pdata->model ? : 7877; + ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100; + ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; + ts->pressure_max = pdata->pressure_max ? : ~0; + + ts->stopacq_polarity = pdata->stopacq_polarity; + 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; + + snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev)); + + input_dev->name = "AD7877 Touchscreen"; + input_dev->phys = ts->phys; + input_dev->dev.parent = &spi->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); + + ad7877_write(spi, AD7877_REG_SEQ1, AD7877_MM_SEQUENCE); + + verify = ad7877_read(spi, AD7877_REG_SEQ1); + + if (verify != AD7877_MM_SEQUENCE){ + dev_err(&spi->dev, "%s: Failed to probe %s\n", + dev_name(&spi->dev), input_dev->name); + err = -ENODEV; + goto err_free_mem; + } + + if (gpio3) + ad7877_write(spi, AD7877_REG_EXTWRITE, AD7877_EXTW_GPIO_3_CONF); + + ad7877_setup_ts_def_msg(spi, ts); + + /* Request AD7877 /DAV GPIO interrupt */ + + err = request_irq(spi->irq, ad7877_irq, IRQF_TRIGGER_FALLING | + IRQF_SAMPLE_RANDOM, spi->dev.driver->name, ts); + if (err) { + dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq); + goto err_free_mem; + } + + err = sysfs_create_group(&spi->dev.kobj, &ad7877_attr_group); + if (err) + goto err_free_irq; + + err = device_create_file(&spi->dev, + gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3); + if (err) + goto err_remove_attr_group; + + err = input_register_device(input_dev); + if (err) + goto err_remove_attr; + + return 0; + +err_remove_attr: + device_remove_file(&spi->dev, + gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3); +err_remove_attr_group: + sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); +err_free_irq: + free_irq(spi->irq, ts); +err_free_mem: + input_free_device(input_dev); + kfree(ts); + dev_set_drvdata(&spi->dev, NULL); + return err; +} + +static int __devexit ad7877_remove(struct spi_device *spi) +{ + struct ad7877 *ts = dev_get_drvdata(&spi->dev); + + sysfs_remove_group(&spi->dev.kobj, &ad7877_attr_group); + device_remove_file(&spi->dev, + gpio3 ? &dev_attr_gpio3 : &dev_attr_aux3); + + ad7877_disable(ts); + free_irq(ts->spi->irq, ts); + + input_unregister_device(ts->input); + kfree(ts); + + dev_dbg(&spi->dev, "unregistered touchscreen\n"); + dev_set_drvdata(&spi->dev, NULL); + + return 0; +} + +#ifdef CONFIG_PM +static int ad7877_suspend(struct spi_device *spi, pm_message_t message) +{ + struct ad7877 *ts = dev_get_drvdata(&spi->dev); + + ad7877_disable(ts); + + return 0; +} + +static int ad7877_resume(struct spi_device *spi) +{ + struct ad7877 *ts = dev_get_drvdata(&spi->dev); + + ad7877_enable(ts); + + return 0; +} +#else +#define ad7877_suspend NULL +#define ad7877_resume NULL +#endif + +static struct spi_driver ad7877_driver = { + .driver = { + .name = "ad7877", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = ad7877_probe, + .remove = __devexit_p(ad7877_remove), + .suspend = ad7877_suspend, + .resume = ad7877_resume, +}; + +static int __init ad7877_init(void) +{ + return spi_register_driver(&ad7877_driver); +} +module_init(ad7877_init); + +static void __exit ad7877_exit(void) +{ + spi_unregister_driver(&ad7877_driver); +} +module_exit(ad7877_exit); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("AD7877 touchscreen Driver"); +MODULE_LICENSE("GPL"); |