290 lines
6.4 KiB
C
290 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for cypress touch screen controller
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*
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* Copyright (c) 2009 Aava Mobile
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*
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* Some cleanups by Alan Cox <alan@linux.intel.com>
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*/
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/gpio/consumer.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <asm/byteorder.h>
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#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
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/* Touch coordinates */
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#define CY8CTMG110_X_MIN 0
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#define CY8CTMG110_Y_MIN 0
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#define CY8CTMG110_X_MAX 759
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#define CY8CTMG110_Y_MAX 465
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/* cy8ctmg110 register definitions */
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#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
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#define CY8CTMG110_TOUCH_SLEEP_TIME 2
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#define CY8CTMG110_TOUCH_X1 3
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#define CY8CTMG110_TOUCH_Y1 5
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#define CY8CTMG110_TOUCH_X2 7
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#define CY8CTMG110_TOUCH_Y2 9
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#define CY8CTMG110_FINGERS 11
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#define CY8CTMG110_GESTURE 12
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#define CY8CTMG110_REG_MAX 13
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/*
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* The touch driver structure.
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*/
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struct cy8ctmg110 {
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struct input_dev *input;
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char phys[32];
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struct i2c_client *client;
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struct gpio_desc *reset_gpio;
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};
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/*
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* cy8ctmg110_power is the routine that is called when touch hardware
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* is being powered off or on. When powering on this routine de-asserts
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* the RESET line, when powering off reset line is asserted.
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*/
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static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
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{
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if (ts->reset_gpio)
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gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
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}
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static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
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unsigned char len, unsigned char *value)
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{
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struct i2c_client *client = tsc->client;
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int ret;
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unsigned char i2c_data[6];
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BUG_ON(len > 5);
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i2c_data[0] = reg;
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memcpy(i2c_data + 1, value, len);
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ret = i2c_master_send(client, i2c_data, len + 1);
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if (ret != len + 1) {
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dev_err(&client->dev, "i2c write data cmd failed\n");
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return ret < 0 ? ret : -EIO;
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}
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return 0;
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}
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static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
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unsigned char *data, unsigned char len, unsigned char cmd)
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{
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struct i2c_client *client = tsc->client;
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int ret;
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struct i2c_msg msg[2] = {
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/* first write slave position to i2c devices */
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{
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.addr = client->addr,
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.len = 1,
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.buf = &cmd
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},
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/* Second read data from position */
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = len,
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.buf = data
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}
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};
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ret = i2c_transfer(client->adapter, msg, 2);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
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{
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struct input_dev *input = tsc->input;
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unsigned char reg_p[CY8CTMG110_REG_MAX];
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memset(reg_p, 0, CY8CTMG110_REG_MAX);
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/* Reading coordinates */
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if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
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return -EIO;
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/* Number of touch */
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if (reg_p[8] == 0) {
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input_report_key(input, BTN_TOUCH, 0);
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} else {
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input_report_key(input, BTN_TOUCH, 1);
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input_report_abs(input, ABS_X,
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be16_to_cpup((__be16 *)(reg_p + 0)));
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input_report_abs(input, ABS_Y,
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be16_to_cpup((__be16 *)(reg_p + 2)));
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}
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input_sync(input);
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return 0;
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}
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static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
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{
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unsigned char reg_p[3];
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if (sleep) {
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reg_p[0] = 0x00;
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reg_p[1] = 0xff;
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reg_p[2] = 5;
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} else {
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reg_p[0] = 0x10;
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reg_p[1] = 0xff;
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reg_p[2] = 0;
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}
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return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
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}
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static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
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{
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struct cy8ctmg110 *tsc = dev_id;
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cy8ctmg110_touch_pos(tsc);
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return IRQ_HANDLED;
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}
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static void cy8ctmg110_shut_off(void *_ts)
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{
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struct cy8ctmg110 *ts = _ts;
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cy8ctmg110_set_sleepmode(ts, true);
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cy8ctmg110_power(ts, false);
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}
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static int cy8ctmg110_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct cy8ctmg110 *ts;
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struct input_dev *input_dev;
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int err;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_WORD_DATA))
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return -EIO;
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ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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input_dev = devm_input_allocate_device(&client->dev);
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if (!input_dev)
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return -ENOMEM;
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ts->client = client;
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ts->input = input_dev;
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snprintf(ts->phys, sizeof(ts->phys),
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"%s/input0", dev_name(&client->dev));
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input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
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input_dev->phys = ts->phys;
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input_dev->id.bustype = BUS_I2C;
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input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X,
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CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
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input_set_abs_params(input_dev, ABS_Y,
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CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
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/* Request and assert reset line */
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ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
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GPIOD_OUT_HIGH);
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if (IS_ERR(ts->reset_gpio)) {
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err = PTR_ERR(ts->reset_gpio);
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dev_err(&client->dev,
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"Unable to request reset GPIO: %d\n", err);
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return err;
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}
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cy8ctmg110_power(ts, true);
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cy8ctmg110_set_sleepmode(ts, false);
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err = devm_add_action_or_reset(&client->dev, cy8ctmg110_shut_off, ts);
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if (err)
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return err;
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err = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, cy8ctmg110_irq_thread,
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IRQF_ONESHOT, "touch_reset_key", ts);
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if (err) {
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dev_err(&client->dev,
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"irq %d busy? error %d\n", client->irq, err);
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return err;
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}
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err = input_register_device(input_dev);
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if (err)
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return err;
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i2c_set_clientdata(client, ts);
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return 0;
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}
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static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct cy8ctmg110 *ts = i2c_get_clientdata(client);
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if (!device_may_wakeup(&client->dev)) {
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cy8ctmg110_set_sleepmode(ts, true);
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cy8ctmg110_power(ts, false);
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}
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return 0;
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}
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static int __maybe_unused cy8ctmg110_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct cy8ctmg110 *ts = i2c_get_clientdata(client);
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if (!device_may_wakeup(&client->dev)) {
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cy8ctmg110_power(ts, true);
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cy8ctmg110_set_sleepmode(ts, false);
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}
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
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static const struct i2c_device_id cy8ctmg110_idtable[] = {
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{ CY8CTMG110_DRIVER_NAME, 1 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
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static struct i2c_driver cy8ctmg110_driver = {
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.driver = {
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.name = CY8CTMG110_DRIVER_NAME,
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.pm = &cy8ctmg110_pm,
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},
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.id_table = cy8ctmg110_idtable,
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.probe = cy8ctmg110_probe,
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};
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module_i2c_driver(cy8ctmg110_driver);
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MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
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MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
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MODULE_LICENSE("GPL v2");
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