| /* |
| * TSC2005 touchscreen driver |
| * |
| * Copyright (C) 2006-2010 Nokia Corporation |
| * |
| * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com> |
| * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com> |
| * |
| * 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 <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/input.h> |
| #include <linux/interrupt.h> |
| #include <linux/delay.h> |
| #include <linux/pm.h> |
| #include <linux/spi/spi.h> |
| #include <linux/spi/tsc2005.h> |
| |
| /* |
| * The touchscreen interface operates as follows: |
| * |
| * 1) Pen is pressed against the touchscreen. |
| * 2) TSC2005 performs AD conversion. |
| * 3) After the conversion is done TSC2005 drives DAV line down. |
| * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled. |
| * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2 |
| * values. |
| * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up |
| * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms). |
| * 7) When the penup timer expires, there have not been touch or DAV interrupts |
| * during the last 40ms which means the pen has been lifted. |
| * |
| * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond |
| * after a configurable period (in ms) of activity. If esd_timeout is 0, the |
| * watchdog is disabled. |
| */ |
| |
| /* control byte 1 */ |
| #define TSC2005_CMD 0x80 |
| #define TSC2005_CMD_NORMAL 0x00 |
| #define TSC2005_CMD_STOP 0x01 |
| #define TSC2005_CMD_12BIT 0x04 |
| |
| /* control byte 0 */ |
| #define TSC2005_REG_READ 0x0001 |
| #define TSC2005_REG_PND0 0x0002 |
| #define TSC2005_REG_X 0x0000 |
| #define TSC2005_REG_Y 0x0008 |
| #define TSC2005_REG_Z1 0x0010 |
| #define TSC2005_REG_Z2 0x0018 |
| #define TSC2005_REG_TEMP_HIGH 0x0050 |
| #define TSC2005_REG_CFR0 0x0060 |
| #define TSC2005_REG_CFR1 0x0068 |
| #define TSC2005_REG_CFR2 0x0070 |
| |
| /* configuration register 0 */ |
| #define TSC2005_CFR0_PRECHARGE_276US 0x0040 |
| #define TSC2005_CFR0_STABTIME_1MS 0x0300 |
| #define TSC2005_CFR0_CLOCK_1MHZ 0x1000 |
| #define TSC2005_CFR0_RESOLUTION12 0x2000 |
| #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) |
| |
| /* bits common to both read and write of configuration register 0 */ |
| #define TSC2005_CFR0_RW_MASK 0x3fff |
| |
| /* configuration register 1 */ |
| #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003 |
| #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS |
| |
| /* configuration register 2 */ |
| #define TSC2005_CFR2_MAVE_Z 0x0004 |
| #define TSC2005_CFR2_MAVE_Y 0x0008 |
| #define TSC2005_CFR2_MAVE_X 0x0010 |
| #define TSC2005_CFR2_AVG_7 0x0800 |
| #define TSC2005_CFR2_MEDIUM_15 0x3000 |
| #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \ |
| TSC2005_CFR2_MAVE_Y | \ |
| TSC2005_CFR2_MAVE_Z | \ |
| TSC2005_CFR2_MEDIUM_15 | \ |
| TSC2005_CFR2_AVG_7) |
| |
| #define MAX_12BIT 0xfff |
| #define TSC2005_SPI_MAX_SPEED_HZ 10000000 |
| #define TSC2005_PENUP_TIME_MS 40 |
| |
| struct tsc2005_spi_rd { |
| struct spi_transfer spi_xfer; |
| u32 spi_tx; |
| u32 spi_rx; |
| }; |
| |
| struct tsc2005 { |
| struct spi_device *spi; |
| |
| struct spi_message spi_read_msg; |
| struct tsc2005_spi_rd spi_x; |
| struct tsc2005_spi_rd spi_y; |
| struct tsc2005_spi_rd spi_z1; |
| struct tsc2005_spi_rd spi_z2; |
| |
| struct input_dev *idev; |
| char phys[32]; |
| |
| struct mutex mutex; |
| |
| /* raw copy of previous x,y,z */ |
| int in_x; |
| int in_y; |
| int in_z1; |
| int in_z2; |
| |
| spinlock_t lock; |
| struct timer_list penup_timer; |
| |
| unsigned int esd_timeout; |
| struct delayed_work esd_work; |
| unsigned long last_valid_interrupt; |
| |
| unsigned int x_plate_ohm; |
| |
| bool opened; |
| bool suspended; |
| |
| bool pen_down; |
| |
| void (*set_reset)(bool enable); |
| }; |
| |
| static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd) |
| { |
| u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd; |
| struct spi_transfer xfer = { |
| .tx_buf = &tx, |
| .len = 1, |
| .bits_per_word = 8, |
| }; |
| struct spi_message msg; |
| int error; |
| |
| spi_message_init(&msg); |
| spi_message_add_tail(&xfer, &msg); |
| |
| error = spi_sync(ts->spi, &msg); |
| if (error) { |
| dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n", |
| __func__, cmd, error); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value) |
| { |
| u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value; |
| struct spi_transfer xfer = { |
| .tx_buf = &tx, |
| .len = 4, |
| .bits_per_word = 24, |
| }; |
| struct spi_message msg; |
| int error; |
| |
| spi_message_init(&msg); |
| spi_message_add_tail(&xfer, &msg); |
| |
| error = spi_sync(ts->spi, &msg); |
| if (error) { |
| dev_err(&ts->spi->dev, |
| "%s: failed, register: %x, value: %x, error: %d\n", |
| __func__, reg, value, error); |
| return error; |
| } |
| |
| return 0; |
| } |
| |
| static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last) |
| { |
| memset(rd, 0, sizeof(*rd)); |
| |
| rd->spi_tx = (reg | TSC2005_REG_READ) << 16; |
| rd->spi_xfer.tx_buf = &rd->spi_tx; |
| rd->spi_xfer.rx_buf = &rd->spi_rx; |
| rd->spi_xfer.len = 4; |
| rd->spi_xfer.bits_per_word = 24; |
| rd->spi_xfer.cs_change = !last; |
| } |
| |
| static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value) |
| { |
| struct tsc2005_spi_rd spi_rd; |
| struct spi_message msg; |
| int error; |
| |
| tsc2005_setup_read(&spi_rd, reg, true); |
| |
| spi_message_init(&msg); |
| spi_message_add_tail(&spi_rd.spi_xfer, &msg); |
| |
| error = spi_sync(ts->spi, &msg); |
| if (error) |
| return error; |
| |
| *value = spi_rd.spi_rx; |
| return 0; |
| } |
| |
| static void tsc2005_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, !!pressure); |
| ts->pen_down = true; |
| } |
| } else { |
| input_report_abs(ts->idev, ABS_PRESSURE, 0); |
| if (ts->pen_down) { |
| input_report_key(ts->idev, BTN_TOUCH, 0); |
| ts->pen_down = false; |
| } |
| } |
| input_sync(ts->idev); |
| dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y, |
| pressure); |
| } |
| |
| static irqreturn_t tsc2005_irq_thread(int irq, void *_ts) |
| { |
| struct tsc2005 *ts = _ts; |
| unsigned long flags; |
| unsigned int pressure; |
| u32 x, y; |
| u32 z1, z2; |
| int error; |
| |
| /* read the coordinates */ |
| error = spi_sync(ts->spi, &ts->spi_read_msg); |
| if (unlikely(error)) |
| goto out; |
| |
| x = ts->spi_x.spi_rx; |
| y = ts->spi_y.spi_rx; |
| z1 = ts->spi_z1.spi_rx; |
| z2 = ts->spi_z2.spi_rx; |
| |
| /* validate position */ |
| if (unlikely(x > MAX_12BIT || y > MAX_12BIT)) |
| goto out; |
| |
| /* Skip reading if the pressure components are out of range */ |
| if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2)) |
| goto out; |
| |
| /* |
| * Skip point if this is a pen down with the exact same values as |
| * the value before pen-up - that implies SPI fed us stale data |
| */ |
| if (!ts->pen_down && |
| ts->in_x == x && ts->in_y == y && |
| ts->in_z1 == z1 && ts->in_z2 == z2) { |
| goto out; |
| } |
| |
| /* |
| * At this point we are happy we have a valid and useful reading. |
| * Remember it for later comparisons. We may now begin downsampling. |
| */ |
| ts->in_x = x; |
| ts->in_y = y; |
| ts->in_z1 = z1; |
| ts->in_z2 = z2; |
| |
| /* Compute touch pressure resistance using equation #1 */ |
| pressure = x * (z2 - z1) / z1; |
| pressure = pressure * ts->x_plate_ohm / 4096; |
| if (unlikely(pressure > MAX_12BIT)) |
| goto out; |
| |
| spin_lock_irqsave(&ts->lock, flags); |
| |
| tsc2005_update_pen_state(ts, x, y, pressure); |
| mod_timer(&ts->penup_timer, |
| jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS)); |
| |
| spin_unlock_irqrestore(&ts->lock, flags); |
| |
| ts->last_valid_interrupt = jiffies; |
| out: |
| return IRQ_HANDLED; |
| } |
| |
| static void tsc2005_penup_timer(unsigned long data) |
| { |
| struct tsc2005 *ts = (struct tsc2005 *)data; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&ts->lock, flags); |
| tsc2005_update_pen_state(ts, 0, 0, 0); |
| spin_unlock_irqrestore(&ts->lock, flags); |
| } |
| |
| static void tsc2005_start_scan(struct tsc2005 *ts) |
| { |
| tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE); |
| tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE); |
| tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE); |
| tsc2005_cmd(ts, TSC2005_CMD_NORMAL); |
| } |
| |
| static void tsc2005_stop_scan(struct tsc2005 *ts) |
| { |
| tsc2005_cmd(ts, TSC2005_CMD_STOP); |
| } |
| |
| /* must be called with ts->mutex held */ |
| static void __tsc2005_disable(struct tsc2005 *ts) |
| { |
| tsc2005_stop_scan(ts); |
| |
| disable_irq(ts->spi->irq); |
| del_timer_sync(&ts->penup_timer); |
| |
| cancel_delayed_work_sync(&ts->esd_work); |
| |
| enable_irq(ts->spi->irq); |
| } |
| |
| /* must be called with ts->mutex held */ |
| static void __tsc2005_enable(struct tsc2005 *ts) |
| { |
| tsc2005_start_scan(ts); |
| |
| if (ts->esd_timeout && ts->set_reset) { |
| ts->last_valid_interrupt = jiffies; |
| schedule_delayed_work(&ts->esd_work, |
| round_jiffies_relative( |
| msecs_to_jiffies(ts->esd_timeout))); |
| } |
| |
| } |
| |
| static ssize_t tsc2005_selftest_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| struct tsc2005 *ts = spi_get_drvdata(spi); |
| u16 temp_high; |
| u16 temp_high_orig; |
| u16 temp_high_test; |
| bool success = true; |
| int error; |
| |
| mutex_lock(&ts->mutex); |
| |
| /* |
| * Test TSC2005 communications via temp high register. |
| */ |
| __tsc2005_disable(ts); |
| |
| error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig); |
| if (error) { |
| dev_warn(dev, "selftest failed: read error %d\n", error); |
| success = false; |
| goto out; |
| } |
| |
| temp_high_test = (temp_high_orig - 1) & MAX_12BIT; |
| |
| error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test); |
| if (error) { |
| dev_warn(dev, "selftest failed: write error %d\n", error); |
| success = false; |
| goto out; |
| } |
| |
| error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); |
| if (error) { |
| dev_warn(dev, "selftest failed: read error %d after write\n", |
| error); |
| success = false; |
| goto out; |
| } |
| |
| if (temp_high != temp_high_test) { |
| dev_warn(dev, "selftest failed: %d != %d\n", |
| temp_high, temp_high_test); |
| success = false; |
| } |
| |
| /* hardware reset */ |
| ts->set_reset(false); |
| usleep_range(100, 500); /* only 10us required */ |
| ts->set_reset(true); |
| |
| if (!success) |
| goto out; |
| |
| /* test that the reset really happened */ |
| error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high); |
| if (error) { |
| dev_warn(dev, "selftest failed: read error %d after reset\n", |
| error); |
| success = false; |
| goto out; |
| } |
| |
| if (temp_high != temp_high_orig) { |
| dev_warn(dev, "selftest failed after reset: %d != %d\n", |
| temp_high, temp_high_orig); |
| success = false; |
| } |
| |
| out: |
| __tsc2005_enable(ts); |
| mutex_unlock(&ts->mutex); |
| |
| return sprintf(buf, "%d\n", success); |
| } |
| |
| static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL); |
| |
| static struct attribute *tsc2005_attrs[] = { |
| &dev_attr_selftest.attr, |
| NULL |
| }; |
| |
| static umode_t tsc2005_attr_is_visible(struct kobject *kobj, |
| struct attribute *attr, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| struct spi_device *spi = to_spi_device(dev); |
| struct tsc2005 *ts = spi_get_drvdata(spi); |
| umode_t mode = attr->mode; |
| |
| if (attr == &dev_attr_selftest.attr) { |
| if (!ts->set_reset) |
| mode = 0; |
| } |
| |
| return mode; |
| } |
| |
| static const struct attribute_group tsc2005_attr_group = { |
| .is_visible = tsc2005_attr_is_visible, |
| .attrs = tsc2005_attrs, |
| }; |
| |
| static void tsc2005_esd_work(struct work_struct *work) |
| { |
| struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work); |
| int error; |
| u16 r; |
| |
| if (!mutex_trylock(&ts->mutex)) { |
| /* |
| * If the mutex is taken, it means that disable or enable is in |
| * progress. In that case just reschedule the work. If the work |
| * is not needed, it will be canceled by disable. |
| */ |
| goto reschedule; |
| } |
| |
| if (time_is_after_jiffies(ts->last_valid_interrupt + |
| msecs_to_jiffies(ts->esd_timeout))) |
| goto out; |
| |
| /* We should be able to read register without disabling interrupts. */ |
| error = tsc2005_read(ts, TSC2005_REG_CFR0, &r); |
| if (!error && |
| !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) { |
| goto out; |
| } |
| |
| /* |
| * If we could not read our known value from configuration register 0 |
| * then we should reset the controller as if from power-up and start |
| * scanning again. |
| */ |
| dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n"); |
| |
| disable_irq(ts->spi->irq); |
| del_timer_sync(&ts->penup_timer); |
| |
| tsc2005_update_pen_state(ts, 0, 0, 0); |
| |
| ts->set_reset(false); |
| usleep_range(100, 500); /* only 10us required */ |
| ts->set_reset(true); |
| |
| enable_irq(ts->spi->irq); |
| tsc2005_start_scan(ts); |
| |
| out: |
| mutex_unlock(&ts->mutex); |
| reschedule: |
| /* re-arm the watchdog */ |
| schedule_delayed_work(&ts->esd_work, |
| round_jiffies_relative( |
| msecs_to_jiffies(ts->esd_timeout))); |
| } |
| |
| static int tsc2005_open(struct input_dev *input) |
| { |
| struct tsc2005 *ts = input_get_drvdata(input); |
| |
| mutex_lock(&ts->mutex); |
| |
| if (!ts->suspended) |
| __tsc2005_enable(ts); |
| |
| ts->opened = true; |
| |
| mutex_unlock(&ts->mutex); |
| |
| return 0; |
| } |
| |
| static void tsc2005_close(struct input_dev *input) |
| { |
| struct tsc2005 *ts = input_get_drvdata(input); |
| |
| mutex_lock(&ts->mutex); |
| |
| if (!ts->suspended) |
| __tsc2005_disable(ts); |
| |
| ts->opened = false; |
| |
| mutex_unlock(&ts->mutex); |
| } |
| |
| static void tsc2005_setup_spi_xfer(struct tsc2005 *ts) |
| { |
| tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false); |
| tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false); |
| tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false); |
| tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true); |
| |
| spi_message_init(&ts->spi_read_msg); |
| spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg); |
| spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg); |
| spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg); |
| spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg); |
| } |
| |
| static int tsc2005_probe(struct spi_device *spi) |
| { |
| const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev); |
| struct tsc2005 *ts; |
| struct input_dev *input_dev; |
| unsigned int max_x, max_y, max_p; |
| unsigned int fudge_x, fudge_y, fudge_p; |
| int error; |
| |
| if (!pdata) { |
| dev_dbg(&spi->dev, "no platform data\n"); |
| return -ENODEV; |
| } |
| |
| fudge_x = pdata->ts_x_fudge ? : 4; |
| fudge_y = pdata->ts_y_fudge ? : 8; |
| fudge_p = pdata->ts_pressure_fudge ? : 2; |
| max_x = pdata->ts_x_max ? : MAX_12BIT; |
| max_y = pdata->ts_y_max ? : MAX_12BIT; |
| max_p = pdata->ts_pressure_max ? : MAX_12BIT; |
| |
| if (spi->irq <= 0) { |
| dev_dbg(&spi->dev, "no irq\n"); |
| return -ENODEV; |
| } |
| |
| spi->mode = SPI_MODE_0; |
| spi->bits_per_word = 8; |
| if (!spi->max_speed_hz) |
| spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ; |
| |
| error = spi_setup(spi); |
| if (error) |
| return error; |
| |
| ts = kzalloc(sizeof(*ts), GFP_KERNEL); |
| input_dev = input_allocate_device(); |
| if (!ts || !input_dev) { |
| error = -ENOMEM; |
| goto err_free_mem; |
| } |
| |
| ts->spi = spi; |
| ts->idev = input_dev; |
| |
| ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280; |
| ts->esd_timeout = pdata->esd_timeout_ms; |
| ts->set_reset = pdata->set_reset; |
| |
| mutex_init(&ts->mutex); |
| |
| spin_lock_init(&ts->lock); |
| setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts); |
| |
| INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work); |
| |
| tsc2005_setup_spi_xfer(ts); |
| |
| snprintf(ts->phys, sizeof(ts->phys), |
| "%s/input-ts", dev_name(&spi->dev)); |
| |
| input_dev->name = "TSC2005 touchscreen"; |
| input_dev->phys = ts->phys; |
| input_dev->id.bustype = BUS_SPI; |
| input_dev->dev.parent = &spi->dev; |
| input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY); |
| input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| |
| input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0); |
| input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0); |
| input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0); |
| |
| input_dev->open = tsc2005_open; |
| input_dev->close = tsc2005_close; |
| |
| input_set_drvdata(input_dev, ts); |
| |
| /* Ensure the touchscreen is off */ |
| tsc2005_stop_scan(ts); |
| |
| error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread, |
| IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
| "tsc2005", ts); |
| if (error) { |
| dev_err(&spi->dev, "Failed to request irq, err: %d\n", error); |
| goto err_free_mem; |
| } |
| |
| spi_set_drvdata(spi, ts); |
| error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group); |
| if (error) { |
| dev_err(&spi->dev, |
| "Failed to create sysfs attributes, err: %d\n", error); |
| goto err_clear_drvdata; |
| } |
| |
| error = input_register_device(ts->idev); |
| if (error) { |
| dev_err(&spi->dev, |
| "Failed to register input device, err: %d\n", error); |
| goto err_remove_sysfs; |
| } |
| |
| irq_set_irq_wake(spi->irq, 1); |
| return 0; |
| |
| err_remove_sysfs: |
| sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group); |
| err_clear_drvdata: |
| free_irq(spi->irq, ts); |
| err_free_mem: |
| input_free_device(input_dev); |
| kfree(ts); |
| return error; |
| } |
| |
| static int tsc2005_remove(struct spi_device *spi) |
| { |
| struct tsc2005 *ts = spi_get_drvdata(spi); |
| |
| sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group); |
| |
| free_irq(ts->spi->irq, ts); |
| input_unregister_device(ts->idev); |
| kfree(ts); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int tsc2005_suspend(struct device *dev) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| struct tsc2005 *ts = spi_get_drvdata(spi); |
| |
| mutex_lock(&ts->mutex); |
| |
| if (!ts->suspended && ts->opened) |
| __tsc2005_disable(ts); |
| |
| ts->suspended = true; |
| |
| mutex_unlock(&ts->mutex); |
| |
| return 0; |
| } |
| |
| static int tsc2005_resume(struct device *dev) |
| { |
| struct spi_device *spi = to_spi_device(dev); |
| struct tsc2005 *ts = spi_get_drvdata(spi); |
| |
| mutex_lock(&ts->mutex); |
| |
| if (ts->suspended && ts->opened) |
| __tsc2005_enable(ts); |
| |
| ts->suspended = false; |
| |
| mutex_unlock(&ts->mutex); |
| |
| return 0; |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume); |
| |
| static struct spi_driver tsc2005_driver = { |
| .driver = { |
| .name = "tsc2005", |
| .owner = THIS_MODULE, |
| .pm = &tsc2005_pm_ops, |
| }, |
| .probe = tsc2005_probe, |
| .remove = tsc2005_remove, |
| }; |
| |
| module_spi_driver(tsc2005_driver); |
| |
| MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>"); |
| MODULE_DESCRIPTION("TSC2005 Touchscreen Driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("spi:tsc2005"); |