| /* |
| * 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/pm.h> |
| #include <linux/slab.h> |
| #include <linux/spi/spi.h> |
| #include <linux/spi/ad7877.h> |
| #include <linux/module.h> |
| #include <asm/irq.h> |
| |
| #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(100) |
| |
| #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; |
| struct spi_message msg; |
| struct spi_transfer xfer[6]; |
| |
| /* |
| * DMA (thus cache coherency maintenance) requires the |
| * transfer buffers to live in their own cache lines. |
| */ |
| u16 sample ____cacheline_aligned; |
| }; |
| |
| 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; |
| |
| struct spi_transfer xfer[AD7877_NR_SENSE + 2]; |
| struct spi_message msg; |
| |
| struct mutex mutex; |
| bool disabled; /* P: mutex */ |
| bool gpio3; /* P: mutex */ |
| bool gpio4; /* P: mutex */ |
| |
| spinlock_t lock; |
| struct timer_list timer; /* P: lock */ |
| |
| /* |
| * DMA (thus cache coherency maintenance) requires the |
| * transfer buffers to live in their own cache lines. |
| */ |
| u16 conversion_data[AD7877_NR_SENSE] ____cacheline_aligned; |
| }; |
| |
| static bool gpio3; |
| module_param(gpio3, bool, 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[0].cs_change = 1; |
| |
| 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[0].cs_change = 1; |
| |
| req->xfer[1].tx_buf = &req->ref_on; |
| req->xfer[1].len = 2; |
| req->xfer[1].delay_usecs = ts->vref_delay_usecs; |
| req->xfer[1].cs_change = 1; |
| |
| req->xfer[2].tx_buf = &req->command; |
| req->xfer[2].len = 2; |
| req->xfer[2].delay_usecs = ts->vref_delay_usecs; |
| req->xfer[2].cs_change = 1; |
| |
| req->xfer[3].rx_buf = &req->sample; |
| req->xfer[3].len = 2; |
| req->xfer[3].cs_change = 1; |
| |
| req->xfer[4].tx_buf = &ts->cmd_crtl2; /*REF OFF*/ |
| req->xfer[4].len = 2; |
| req->xfer[4].cs_change = 1; |
| |
| 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 int ad7877_process_data(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; |
| |
| /* |
| * Sample found inconsistent, pressure is beyond |
| * the maximum. Don't report it to user space. |
| */ |
| if (Rt > ts->pressure_max) |
| return -EINVAL; |
| |
| if (!timer_pending(&ts->timer)) |
| input_report_key(input_dev, BTN_TOUCH, 1); |
| |
| 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); |
| |
| return 0; |
| } |
| |
| return -EINVAL; |
| } |
| |
| 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_report_key(input_dev, BTN_TOUCH, 0); |
| input_sync(input_dev); |
| } |
| |
| static void ad7877_timer(unsigned long handle) |
| { |
| struct ad7877 *ts = (void *)handle; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ts->lock, flags); |
| ad7877_ts_event_release(ts); |
| spin_unlock_irqrestore(&ts->lock, flags); |
| } |
| |
| static irqreturn_t ad7877_irq(int irq, void *handle) |
| { |
| struct ad7877 *ts = handle; |
| unsigned long flags; |
| int error; |
| |
| error = spi_sync(ts->spi, &ts->msg); |
| if (error) { |
| dev_err(&ts->spi->dev, "spi_sync --> %d\n", error); |
| goto out; |
| } |
| |
| spin_lock_irqsave(&ts->lock, flags); |
| error = ad7877_process_data(ts); |
| if (!error) |
| mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); |
| spin_unlock_irqrestore(&ts->lock, flags); |
| |
| out: |
| return IRQ_HANDLED; |
| } |
| |
| static void ad7877_disable(struct ad7877 *ts) |
| { |
| mutex_lock(&ts->mutex); |
| |
| if (!ts->disabled) { |
| ts->disabled = true; |
| disable_irq(ts->spi->irq); |
| |
| 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 = false; |
| 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 int val; |
| int error; |
| |
| error = kstrtouint(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 int val; |
| int error; |
| |
| error = kstrtouint(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 int val; |
| int error; |
| |
| error = kstrtouint(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 int val; |
| int error; |
| |
| error = kstrtouint(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_aux3.attr, |
| &dev_attr_bat1.attr, |
| &dev_attr_bat2.attr, |
| &dev_attr_disable.attr, |
| &dev_attr_dac.attr, |
| &dev_attr_gpio3.attr, |
| &dev_attr_gpio4.attr, |
| NULL |
| }; |
| |
| static umode_t ad7877_attr_is_visible(struct kobject *kobj, |
| struct attribute *attr, int n) |
| { |
| umode_t mode = attr->mode; |
| |
| if (attr == &dev_attr_aux3.attr) { |
| if (gpio3) |
| mode = 0; |
| } else if (attr == &dev_attr_gpio3.attr) { |
| if (!gpio3) |
| mode = 0; |
| } |
| |
| return mode; |
| } |
| |
| static const struct attribute_group ad7877_attr_group = { |
| .is_visible = ad7877_attr_is_visible, |
| .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->context = ts; |
| |
| ts->xfer[0].tx_buf = &ts->cmd_crtl1; |
| ts->xfer[0].len = 2; |
| ts->xfer[0].cs_change = 1; |
| |
| spi_message_add_tail(&ts->xfer[0], m); |
| |
| ts->xfer[1].tx_buf = &ts->cmd_dummy; /* Send ZERO */ |
| ts->xfer[1].len = 2; |
| ts->xfer[1].cs_change = 1; |
| |
| spi_message_add_tail(&ts->xfer[1], m); |
| |
| for (i = 0; i < AD7877_NR_SENSE; i++) { |
| ts->xfer[i + 2].rx_buf = &ts->conversion_data[AD7877_SEQ_YPOS + i]; |
| ts->xfer[i + 2].len = 2; |
| if (i < (AD7877_NR_SENSE - 1)) |
| ts->xfer[i + 2].cs_change = 1; |
| 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; |
| } |
| |
| spi->bits_per_word = 16; |
| err = spi_setup(spi); |
| if (err) { |
| dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); |
| return err; |
| } |
| |
| 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_KEY, input_dev->evbit); |
| __set_bit(BTN_TOUCH, input_dev->keybit); |
| __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_threaded_irq(spi->irq, NULL, ad7877_irq, |
| IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| 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 = input_register_device(input_dev); |
| if (err) |
| goto err_remove_attr_group; |
| |
| return 0; |
| |
| 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); |
| |
| 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_SLEEP |
| static int ad7877_suspend(struct device *dev) |
| { |
| struct ad7877 *ts = dev_get_drvdata(dev); |
| |
| ad7877_disable(ts); |
| |
| return 0; |
| } |
| |
| static int ad7877_resume(struct device *dev) |
| { |
| struct ad7877 *ts = dev_get_drvdata(dev); |
| |
| ad7877_enable(ts); |
| |
| return 0; |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(ad7877_pm, ad7877_suspend, ad7877_resume); |
| |
| static struct spi_driver ad7877_driver = { |
| .driver = { |
| .name = "ad7877", |
| .owner = THIS_MODULE, |
| .pm = &ad7877_pm, |
| }, |
| .probe = ad7877_probe, |
| .remove = __devexit_p(ad7877_remove), |
| }; |
| |
| 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"); |
| MODULE_ALIAS("spi:ad7877"); |