X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=blobdiff_plain;f=drivers%2Finput%2Ftouchscreen%2Ftsc2005.c;fp=drivers%2Finput%2Ftouchscreen%2Ftsc2005.c;h=ec4c9e7a736753a7070af69cbddcbd551d0a0f1d;hp=0000000000000000000000000000000000000000;hb=0d5f2216edfeb9904e0d6512f803b0f93871baaf;hpb=14fc69723d3442ef46f8f82b3f481e82f06a346d diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c new file mode 100644 index 00000000000..ec4c9e7a736 --- /dev/null +++ b/drivers/input/touchscreen/tsc2005.c @@ -0,0 +1,728 @@ +/* + * TSC2005 touchscreen driver + * + * Copyright (C) 2006-2008 Nokia Corporation + * + * Author: Lauri Leukkunen + * based on TSC2301 driver by Klaus K. Pedersen + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include +#include +#include +#include +#include +#include +#include + +#include + +/** + * The touchscreen interface operates as follows: + * + * Initialize: + * Request access to GPIO103 (DAV) + * tsc2005_dav_irq_handler will trigger when DAV line goes down + * + * 1) Pen is pressed against touchscreeen + * 2) TSC2005 performs AD conversion + * 3) After the conversion is done TSC2005 drives DAV line down + * 4) GPIO IRQ is received and tsc2005_dav_irq_handler is called + * 5) tsc2005_ts_irq_handler queues up an spi transfer to fetch + * the x, y, z1, z2 values + * 6) tsc2005_ts_rx() reports coordinates to input layer and + * sets up tsc2005_ts_timer() to be called after TSC2005_TS_SCAN_TIME + * 7) When the penup_timer expires, there have not been DAV interrupts + * during the last 20ms which means the pen has been lifted. + */ + +#define TSC2005_VDD_LOWER_27 + +#ifdef TSC2005_VDD_LOWER_27 +#define TSC2005_HZ (10000000) +#else +#define TSC2005_HZ (25000000) +#endif + +#define TSC2005_CMD (0x80) +#define TSC2005_REG (0x00) + +#define TSC2005_CMD_STOP (1) +#define TSC2005_CMD_10BIT (0 << 2) +#define TSC2005_CMD_12BIT (1 << 2) + +#define TSC2005_CMD_SCAN_XYZZ (0 << 3) +#define TSC2005_CMD_SCAN_XY (1 << 3) +#define TSC2005_CMD_SCAN_X (2 << 3) +#define TSC2005_CMD_SCAN_Y (3 << 3) +#define TSC2005_CMD_SCAN_ZZ (4 << 3) +#define TSC2005_CMD_AUX_SINGLE (5 << 3) +#define TSC2005_CMD_TEMP1 (6 << 3) +#define TSC2005_CMD_TEMP2 (7 << 3) +#define TSC2005_CMD_AUX_CONT (8 << 3) +#define TSC2005_CMD_TEST_X_CONN (9 << 3) +#define TSC2005_CMD_TEST_Y_CONN (10 << 3) +/* command 11 reserved */ +#define TSC2005_CMD_TEST_SHORT (12 << 3) +#define TSC2005_CMD_DRIVE_XX (13 << 3) +#define TSC2005_CMD_DRIVE_YY (14 << 3) +#define TSC2005_CMD_DRIVE_YX (15 << 3) + +#define TSC2005_REG_X (0 << 3) +#define TSC2005_REG_Y (1 << 3) +#define TSC2005_REG_Z1 (2 << 3) +#define TSC2005_REG_Z2 (3 << 3) +#define TSC2005_REG_AUX (4 << 3) +#define TSC2005_REG_TEMP1 (5 << 3) +#define TSC2005_REG_TEMP2 (6 << 3) +#define TSC2005_REG_STATUS (7 << 3) +#define TSC2005_REG_AUX_HIGH (8 << 3) +#define TSC2005_REG_AUX_LOW (9 << 3) +#define TSC2005_REG_TEMP_HIGH (10 << 3) +#define TSC2005_REG_TEMP_LOW (11 << 3) +#define TSC2005_REG_CFR0 (12 << 3) +#define TSC2005_REG_CFR1 (13 << 3) +#define TSC2005_REG_CFR2 (14 << 3) +#define TSC2005_REG_FUNCTION (15 << 3) + +#define TSC2005_REG_PND0 (1 << 1) +#define TSC2005_REG_READ (0x01) +#define TSC2005_REG_WRITE (0x00) + + +#define TSC2005_CFR0_LONGSAMPLING (1) +#define TSC2005_CFR0_DETECTINWAIT (1 << 1) +#define TSC2005_CFR0_SENSETIME_32US (0) +#define TSC2005_CFR0_SENSETIME_96US (1 << 2) +#define TSC2005_CFR0_SENSETIME_544US (1 << 3) +#define TSC2005_CFR0_SENSETIME_2080US (1 << 4) +#define TSC2005_CFR0_SENSETIME_2656US (0x001C) +#define TSC2005_CFR0_PRECHARGE_20US (0x0000) +#define TSC2005_CFR0_PRECHARGE_84US (0x0020) +#define TSC2005_CFR0_PRECHARGE_276US (0x0040) +#define TSC2005_CFR0_PRECHARGE_1044US (0x0080) +#define TSC2005_CFR0_PRECHARGE_1364US (0x00E0) +#define TSC2005_CFR0_STABTIME_0US (0x0000) +#define TSC2005_CFR0_STABTIME_100US (0x0100) +#define TSC2005_CFR0_STABTIME_500US (0x0200) +#define TSC2005_CFR0_STABTIME_1MS (0x0300) +#define TSC2005_CFR0_STABTIME_5MS (0x0400) +#define TSC2005_CFR0_STABTIME_100MS (0x0700) +#define TSC2005_CFR0_CLOCK_4MHZ (0x0000) +#define TSC2005_CFR0_CLOCK_2MHZ (0x0800) +#define TSC2005_CFR0_CLOCK_1MHZ (0x1000) +#define TSC2005_CFR0_RESOLUTION12 (0x2000) +#define TSC2005_CFR0_STATUS (0x4000) +#define TSC2005_CFR0_PENMODE (0x8000) + +#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \ + TSC2005_CFR0_CLOCK_1MHZ | \ + TSC2005_CFR0_RESOLUTION12 | \ + TSC2005_CFR0_PRECHARGE_276US | \ + TSC2005_CFR0_PENMODE) + +#define TSC2005_CFR1_BATCHDELAY_0MS (0x0000) +#define TSC2005_CFR1_BATCHDELAY_1MS (0x0001) +#define TSC2005_CFR1_BATCHDELAY_2MS (0x0002) +#define TSC2005_CFR1_BATCHDELAY_4MS (0x0003) +#define TSC2005_CFR1_BATCHDELAY_10MS (0x0004) +#define TSC2005_CFR1_BATCHDELAY_20MS (0x0005) +#define TSC2005_CFR1_BATCHDELAY_40MS (0x0006) +#define TSC2005_CFR1_BATCHDELAY_100MS (0x0007) + +#define TSC2005_CFR1_INITVALUE (TSC2005_CFR1_BATCHDELAY_2MS) + +#define TSC2005_CFR2_MAVE_TEMP (0x0001) +#define TSC2005_CFR2_MAVE_AUX (0x0002) +#define TSC2005_CFR2_MAVE_Z (0x0004) +#define TSC2005_CFR2_MAVE_Y (0x0008) +#define TSC2005_CFR2_MAVE_X (0x0010) +#define TSC2005_CFR2_AVG_1 (0x0000) +#define TSC2005_CFR2_AVG_3 (0x0400) +#define TSC2005_CFR2_AVG_7 (0x0800) +#define TSC2005_CFR2_MEDIUM_1 (0x0000) +#define TSC2005_CFR2_MEDIUM_3 (0x1000) +#define TSC2005_CFR2_MEDIUM_7 (0x2000) +#define TSC2005_CFR2_MEDIUM_15 (0x3000) + +#define TSC2005_CFR2_IRQ_DAV (0x4000) +#define TSC2005_CFR2_IRQ_PEN (0x8000) +#define TSC2005_CFR2_IRQ_PENDAV (0x0000) + +#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_IRQ_DAV | \ + TSC2005_CFR2_MAVE_X | \ + TSC2005_CFR2_MAVE_Y | \ + TSC2005_CFR2_MAVE_Z | \ + TSC2005_CFR2_MEDIUM_15 | \ + TSC2005_CFR2_AVG_7) + +#define MAX_12BIT ((1 << 12) - 1) +#define TS_SAMPLES 4 +#define TS_RECT_SIZE 8 +#define TSC2005_TS_PENUP_TIME 20 + +static const u32 tsc2005_read_reg[] = { + (TSC2005_REG | TSC2005_REG_X | TSC2005_REG_READ) << 16, + (TSC2005_REG | TSC2005_REG_Y | TSC2005_REG_READ) << 16, + (TSC2005_REG | TSC2005_REG_Z1 | TSC2005_REG_READ) << 16, + (TSC2005_REG | TSC2005_REG_Z2 | TSC2005_REG_READ) << 16, +}; +#define NUM_READ_REGS (sizeof(tsc2005_read_reg)/sizeof(tsc2005_read_reg[0])) + +struct tsc2005 { + struct spi_device *spi; + + struct input_dev *idev; + char phys[32]; + struct timer_list penup_timer; + spinlock_t lock; + struct mutex mutex; + + struct spi_message read_msg; + struct spi_transfer read_xfer[NUM_READ_REGS]; + u32 data[NUM_READ_REGS]; + + /* previous x,y,z */ + int x; + int y; + int p; + /* average accumulators for each component */ + int sample_cnt; + int avg_x; + int avg_y; + int avg_z1; + int avg_z2; + /* configuration */ + int x_plate_ohm; + int hw_avg_max; + int stab_time; + int p_max; + int touch_pressure; + int irq; + s16 dav_gpio; + /* status */ + u8 sample_sent; + u8 pen_down; + u8 disabled; + u8 disable_depth; + u8 spi_active; +}; + +static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd) +{ + u16 data = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; + struct spi_message msg; + struct spi_transfer xfer = { 0 }; + + xfer.tx_buf = &data; + xfer.rx_buf = NULL; + xfer.len = 1; + xfer.bits_per_word = 8; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + spi_sync(ts->spi, &msg); +} + +static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) +{ + u32 tx; + struct spi_message msg; + struct spi_transfer xfer = { 0 }; + + tx = (TSC2005_REG | reg | TSC2005_REG_PND0 | + TSC2005_REG_WRITE) << 16; + tx |= value; + + xfer.tx_buf = &tx; + xfer.rx_buf = NULL; + xfer.len = 4; + xfer.bits_per_word = 24; + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + spi_sync(ts->spi, &msg); +} + +static void tsc2005_ts_update_pen_state(struct tsc2005 *ts, + int x, int y, int pressure) +{ + if (pressure) { + input_report_abs(ts->idev, ABS_X, x); + input_report_abs(ts->idev, ABS_Y, y); + input_report_abs(ts->idev, ABS_PRESSURE, pressure); + if (!ts->pen_down) { + input_report_key(ts->idev, BTN_TOUCH, 1); + ts->pen_down = 1; + } + } else { + input_report_abs(ts->idev, ABS_PRESSURE, 0); + if (ts->pen_down) { + input_report_key(ts->idev, BTN_TOUCH, 0); + ts->pen_down = 0; + } + } + + input_sync(ts->idev); +} + +/* + * This function is called by the SPI framework after the coordinates + * have been read from TSC2005 + */ +static void tsc2005_ts_rx(void *arg) +{ + struct tsc2005 *ts = arg; + unsigned long flags; + int inside_rect, pressure_limit; + int x, y, z1, z2, pressure; + + spin_lock_irqsave(&ts->lock, flags); + + x = ts->data[0]; + y = ts->data[1]; + z1 = ts->data[2]; + z2 = ts->data[3]; + + /* validate pressure and position */ + if (x > MAX_12BIT || y > MAX_12BIT) + goto out; + + /* skip coords if the pressure-components are out of range */ + if (z1 < 100 || z2 > 4000) + goto out; + + /* don't run average on the "pen down" event */ + if (ts->sample_sent) { + ts->avg_x += x; + ts->avg_y += y; + ts->avg_z1 += z1; + ts->avg_z2 += z2; + + if (++ts->sample_cnt < TS_SAMPLES) + goto out; + + x = ts->avg_x / TS_SAMPLES; + y = ts->avg_y / TS_SAMPLES; + z1 = ts->avg_z1 / TS_SAMPLES; + z2 = ts->avg_z2 / TS_SAMPLES; + } + + ts->sample_cnt = 0; + ts->avg_x = 0; + ts->avg_y = 0; + ts->avg_z1 = 0; + ts->avg_z2 = 0; + + if (z1) { + pressure = x * (z2 - z1) / z1; + pressure = pressure * ts->x_plate_ohm / 4096; + } else + goto out; + + pressure_limit = ts->sample_sent? ts->p_max: ts->touch_pressure; + if (pressure > pressure_limit) + goto out; + + /* discard the event if it still is within the previous rect - unless + * if the pressure is harder, but then use previous x,y position */ + inside_rect = (ts->sample_sent && + x > (int)ts->x - TS_RECT_SIZE && + x < (int)ts->x + TS_RECT_SIZE && + y > (int)ts->y - TS_RECT_SIZE && + y < (int)ts->y + TS_RECT_SIZE); + if (inside_rect) + x = ts->x, y = ts->y; + + if (!inside_rect || pressure < ts->p) { + tsc2005_ts_update_pen_state(ts, x, y, pressure); + ts->sample_sent = 1; + ts->x = x; + ts->y = y; + ts->p = pressure; + } +out: + ts->spi_active = 0; + spin_unlock_irqrestore(&ts->lock, flags); + + /* kick pen up timer - to make sure it expires again(!) */ + if (ts->sample_sent) + mod_timer(&ts->penup_timer, + jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME)); +} + +static void tsc2005_ts_penup_timer_handler(unsigned long data) +{ + struct tsc2005 *ts = (struct tsc2005 *)data; + + if (ts->sample_sent) { + tsc2005_ts_update_pen_state(ts, 0, 0, 0); + ts->sample_sent = 0; + } +} + +/* + * This interrupt is called when pen is down and coordinates are + * available. That is indicated by a falling edge on DAV line. + */ +static irqreturn_t tsc2005_ts_irq_handler(int irq, void *dev_id) +{ + struct tsc2005 *ts = dev_id; + int r; + + if (ts->spi_active) + return IRQ_HANDLED; + + ts->spi_active = 1; + r = spi_async(ts->spi, &ts->read_msg); + if (r) + dev_err(&ts->spi->dev, "ts: spi_async() failed"); + + /* kick pen up timer */ + mod_timer(&ts->penup_timer, + jiffies + msecs_to_jiffies(TSC2005_TS_PENUP_TIME)); + + return IRQ_HANDLED; +} + +static void tsc2005_ts_setup_spi_xfer(struct tsc2005 *ts) +{ + struct spi_message *m = &ts->read_msg; + struct spi_transfer *x = &ts->read_xfer[0]; + int i; + + spi_message_init(m); + + for (i = 0; i < NUM_READ_REGS; i++, x++) { + x->tx_buf = &tsc2005_read_reg[i]; + x->rx_buf = &ts->data[i]; + x->len = 4; + x->bits_per_word = 24; + x->cs_change = i < (NUM_READ_REGS - 1); + spi_message_add_tail(x, m); + } + + m->complete = tsc2005_ts_rx; + m->context = ts; +} + +static ssize_t tsc2005_ts_pen_down_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct tsc2005 *tsc = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", tsc->pen_down); +} + +static DEVICE_ATTR(pen_down, S_IRUGO, tsc2005_ts_pen_down_show, NULL); + +static int tsc2005_configure(struct tsc2005 *tsc, int flags) +{ + tsc2005_write(tsc, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); + tsc2005_write(tsc, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); + tsc2005_write(tsc, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); + tsc2005_cmd(tsc, flags); + + return 0; +} + +static void tsc2005_start_scan(struct tsc2005 *tsc) +{ + tsc2005_configure(tsc, TSC2005_CMD_SCAN_XYZZ); +} + +static void tsc2005_stop_scan(struct tsc2005 *tsc) +{ + tsc2005_cmd(tsc, TSC2005_CMD_STOP); +} + +/* Must be called with mutex held */ +static void tsc2005_disable(struct tsc2005 *ts) +{ + if (ts->disable_depth++ != 0) + return; + + disable_irq(ts->irq); + + /* wait until penup timer expire normally */ + do { + msleep(4); + } while (ts->sample_sent); + + tsc2005_stop_scan(ts); +} + +static void tsc2005_enable(struct tsc2005 *ts) +{ + if (--ts->disable_depth != 0) + return; + + enable_irq(ts->irq); + + tsc2005_start_scan(ts); +} + +static ssize_t tsc2005_disable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tsc2005 *ts = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ts->disabled); +} + +static ssize_t tsc2005_disable_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tsc2005 *tsc = dev_get_drvdata(dev); + unsigned long res; + int i; + + i = strict_strtoul(buf, 10, &res); + i = i ? 1 : 0; + + mutex_lock(&tsc->mutex); + if (i == tsc->disabled) + goto out; + tsc->disabled = i; + + if (i) + tsc2005_disable(tsc); + else + tsc2005_enable(tsc); +out: + mutex_unlock(&tsc->mutex); + return count; +} + +static DEVICE_ATTR(disable_ts, 0664, tsc2005_disable_show, + tsc2005_disable_store); + + +static int __devinit tsc2005_ts_init(struct tsc2005 *ts, + struct tsc2005_platform_data *pdata) +{ + struct input_dev *idev; + int dav_gpio, r; + int x_max, y_max; + int x_fudge, y_fudge, p_fudge; + + if (pdata->dav_gpio < 0) { + dev_err(&ts->spi->dev, "need DAV GPIO"); + return -EINVAL; + } + dav_gpio = pdata->dav_gpio; + ts->dav_gpio = dav_gpio; + dev_dbg(&ts->spi->dev, "TSC2005: DAV GPIO = %d\n", dav_gpio); + + r = gpio_request(dav_gpio, "TSC2005 dav"); + if (r < 0) { + dev_err(&ts->spi->dev, "unable to get DAV GPIO"); + goto err1; + } + gpio_direction_input(dav_gpio); + ts->irq = gpio_to_irq(dav_gpio); + dev_dbg(&ts->spi->dev, "TSC2005: DAV IRQ = %d\n", ts->irq); + + init_timer(&ts->penup_timer); + setup_timer(&ts->penup_timer, tsc2005_ts_penup_timer_handler, + (unsigned long)ts); + + spin_lock_init(&ts->lock); + mutex_init(&ts->mutex); + + ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280; + ts->hw_avg_max = pdata->ts_hw_avg; + ts->stab_time = pdata->ts_stab_time; + x_max = pdata->ts_x_max ? : 4096; + x_fudge = pdata->ts_x_fudge ? : 4; + y_max = pdata->ts_y_max ? : 4096; + y_fudge = pdata->ts_y_fudge ? : 8; + ts->p_max = pdata->ts_pressure_max ? : MAX_12BIT; + ts->touch_pressure = pdata->ts_touch_pressure ? : ts->p_max; + p_fudge = pdata->ts_pressure_fudge ? : 2; + + idev = input_allocate_device(); + if (idev == NULL) { + r = -ENOMEM; + goto err2; + } + + idev->name = "TSC2005 touchscreen"; + snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts", + dev_name(&ts->spi->dev)); + idev->phys = ts->phys; + + idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); + idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE); + ts->idev = idev; + + tsc2005_ts_setup_spi_xfer(ts); + + input_set_abs_params(idev, ABS_X, 0, x_max, x_fudge, 0); + input_set_abs_params(idev, ABS_Y, 0, y_max, y_fudge, 0); + input_set_abs_params(idev, ABS_PRESSURE, 0, ts->p_max, p_fudge, 0); + + tsc2005_start_scan(ts); + + r = request_irq(ts->irq, tsc2005_ts_irq_handler, + IRQF_TRIGGER_FALLING | IRQF_DISABLED | + IRQF_SAMPLE_RANDOM, "tsc2005", ts); + if (r < 0) { + dev_err(&ts->spi->dev, "unable to get DAV IRQ"); + goto err3; + } + + set_irq_wake(ts->irq, 1); + + r = input_register_device(idev); + if (r < 0) { + dev_err(&ts->spi->dev, "can't register touchscreen device\n"); + goto err4; + } + + /* We can tolerate these failing */ + if (device_create_file(&ts->spi->dev, &dev_attr_pen_down)); + if (device_create_file(&ts->spi->dev, &dev_attr_disable_ts)); + + return 0; +err4: + free_irq(ts->irq, ts); +err3: + tsc2005_stop_scan(ts); + input_free_device(idev); +err2: + gpio_free(dav_gpio); +err1: + return r; +} + +static int __devinit tsc2005_probe(struct spi_device *spi) +{ + struct tsc2005 *tsc; + struct tsc2005_platform_data *pdata = spi->dev.platform_data; + int r; + + if (!pdata) { + dev_dbg(&spi->dev, "no platform data?\n"); + return -ENODEV; + } + + tsc = kzalloc(sizeof(*tsc), GFP_KERNEL); + if (tsc == NULL) + return -ENOMEM; + + dev_set_drvdata(&spi->dev, tsc); + tsc->spi = spi; + spi->dev.power.power_state = PMSG_ON; + + spi->mode = SPI_MODE_0; + spi->bits_per_word = 8; + /* The max speed might've been defined by the board-specific + * struct */ + if (!spi->max_speed_hz) + spi->max_speed_hz = TSC2005_HZ; + + spi_setup(spi); + + r = tsc2005_ts_init(tsc, pdata); + if (r) + goto err1; + + return 0; + +err1: + kfree(tsc); + return r; +} + +static int __devexit tsc2005_remove(struct spi_device *spi) +{ + struct tsc2005 *ts = dev_get_drvdata(&spi->dev); + + mutex_lock(&ts->mutex); + tsc2005_disable(ts); + mutex_unlock(&ts->mutex); + + device_remove_file(&ts->spi->dev, &dev_attr_disable_ts); + device_remove_file(&ts->spi->dev, &dev_attr_pen_down); + + free_irq(ts->irq, ts); + input_unregister_device(ts->idev); + + gpio_free(ts->dav_gpio); + kfree(ts); + + return 0; +} + +#ifdef CONFIG_PM +static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg) +{ + struct tsc2005 *ts = dev_get_drvdata(&spi->dev); + + mutex_lock(&ts->mutex); + tsc2005_disable(ts); + mutex_unlock(&ts->mutex); + + return 0; +} + +static int tsc2005_resume(struct spi_device *spi) +{ + struct tsc2005 *ts = dev_get_drvdata(&spi->dev); + + mutex_lock(&ts->mutex); + tsc2005_enable(ts); + mutex_unlock(&ts->mutex); + + return 0; +} +#endif + +static struct spi_driver tsc2005_driver = { + .driver = { + .name = "tsc2005", + .owner = THIS_MODULE, + }, +#ifdef CONFIG_PM + .suspend = tsc2005_suspend, + .resume = tsc2005_resume, +#endif + .probe = tsc2005_probe, + .remove = __devexit_p(tsc2005_remove), +}; + +static int __init tsc2005_init(void) +{ + printk(KERN_INFO "TSC2005 driver initializing\n"); + + return spi_register_driver(&tsc2005_driver); +} +module_init(tsc2005_init); + +static void __exit tsc2005_exit(void) +{ + spi_unregister_driver(&tsc2005_driver); +} +module_exit(tsc2005_exit); + +MODULE_AUTHOR("Lauri Leukkunen "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:tsc2005");