diff options
Diffstat (limited to 'drivers/input/touchscreen/cy8ctmg110_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/cy8ctmg110_ts.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/cy8ctmg110_ts.c b/drivers/input/touchscreen/cy8ctmg110_ts.c new file mode 100644 index 0000000000..54d6c4869e --- /dev/null +++ b/drivers/input/touchscreen/cy8ctmg110_ts.c @@ -0,0 +1,289 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for cypress touch screen controller + * + * Copyright (c) 2009 Aava Mobile + * + * Some cleanups by Alan Cox <alan@linux.intel.com> + */ + +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/gpio/consumer.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <asm/byteorder.h> + +#define CY8CTMG110_DRIVER_NAME "cy8ctmg110" + +/* Touch coordinates */ +#define CY8CTMG110_X_MIN 0 +#define CY8CTMG110_Y_MIN 0 +#define CY8CTMG110_X_MAX 759 +#define CY8CTMG110_Y_MAX 465 + + +/* cy8ctmg110 register definitions */ +#define CY8CTMG110_TOUCH_WAKEUP_TIME 0 +#define CY8CTMG110_TOUCH_SLEEP_TIME 2 +#define CY8CTMG110_TOUCH_X1 3 +#define CY8CTMG110_TOUCH_Y1 5 +#define CY8CTMG110_TOUCH_X2 7 +#define CY8CTMG110_TOUCH_Y2 9 +#define CY8CTMG110_FINGERS 11 +#define CY8CTMG110_GESTURE 12 +#define CY8CTMG110_REG_MAX 13 + + +/* + * The touch driver structure. + */ +struct cy8ctmg110 { + struct input_dev *input; + char phys[32]; + struct i2c_client *client; + struct gpio_desc *reset_gpio; +}; + +/* + * cy8ctmg110_power is the routine that is called when touch hardware + * is being powered off or on. When powering on this routine de-asserts + * the RESET line, when powering off reset line is asserted. + */ +static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron) +{ + if (ts->reset_gpio) + gpiod_set_value_cansleep(ts->reset_gpio, !poweron); +} + +static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg, + unsigned char len, unsigned char *value) +{ + struct i2c_client *client = tsc->client; + int ret; + unsigned char i2c_data[6]; + + BUG_ON(len > 5); + + i2c_data[0] = reg; + memcpy(i2c_data + 1, value, len); + + ret = i2c_master_send(client, i2c_data, len + 1); + if (ret != len + 1) { + dev_err(&client->dev, "i2c write data cmd failed\n"); + return ret < 0 ? ret : -EIO; + } + + return 0; +} + +static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc, + unsigned char *data, unsigned char len, unsigned char cmd) +{ + struct i2c_client *client = tsc->client; + int ret; + struct i2c_msg msg[2] = { + /* first write slave position to i2c devices */ + { + .addr = client->addr, + .len = 1, + .buf = &cmd + }, + /* Second read data from position */ + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = len, + .buf = data + } + }; + + ret = i2c_transfer(client->adapter, msg, 2); + if (ret < 0) + return ret; + + return 0; +} + +static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc) +{ + struct input_dev *input = tsc->input; + unsigned char reg_p[CY8CTMG110_REG_MAX]; + + memset(reg_p, 0, CY8CTMG110_REG_MAX); + + /* Reading coordinates */ + if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0) + return -EIO; + + /* Number of touch */ + if (reg_p[8] == 0) { + input_report_key(input, BTN_TOUCH, 0); + } else { + input_report_key(input, BTN_TOUCH, 1); + input_report_abs(input, ABS_X, + be16_to_cpup((__be16 *)(reg_p + 0))); + input_report_abs(input, ABS_Y, + be16_to_cpup((__be16 *)(reg_p + 2))); + } + + input_sync(input); + + return 0; +} + +static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep) +{ + unsigned char reg_p[3]; + + if (sleep) { + reg_p[0] = 0x00; + reg_p[1] = 0xff; + reg_p[2] = 5; + } else { + reg_p[0] = 0x10; + reg_p[1] = 0xff; + reg_p[2] = 0; + } + + return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p); +} + +static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id) +{ + struct cy8ctmg110 *tsc = dev_id; + + cy8ctmg110_touch_pos(tsc); + + return IRQ_HANDLED; +} + +static void cy8ctmg110_shut_off(void *_ts) +{ + struct cy8ctmg110 *ts = _ts; + + cy8ctmg110_set_sleepmode(ts, true); + cy8ctmg110_power(ts, false); +} + +static int cy8ctmg110_probe(struct i2c_client *client) +{ + struct cy8ctmg110 *ts; + struct input_dev *input_dev; + int err; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_WORD_DATA)) + return -EIO; + + ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + input_dev = devm_input_allocate_device(&client->dev); + if (!input_dev) + return -ENOMEM; + + ts->client = client; + ts->input = input_dev; + + snprintf(ts->phys, sizeof(ts->phys), + "%s/input0", dev_name(&client->dev)); + + input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen"; + input_dev->phys = ts->phys; + input_dev->id.bustype = BUS_I2C; + + input_set_capability(input_dev, EV_KEY, BTN_TOUCH); + input_set_abs_params(input_dev, ABS_X, + CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0); + input_set_abs_params(input_dev, ABS_Y, + CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0); + + /* Request and assert reset line */ + ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL, + GPIOD_OUT_HIGH); + if (IS_ERR(ts->reset_gpio)) { + err = PTR_ERR(ts->reset_gpio); + dev_err(&client->dev, + "Unable to request reset GPIO: %d\n", err); + return err; + } + + cy8ctmg110_power(ts, true); + cy8ctmg110_set_sleepmode(ts, false); + + err = devm_add_action_or_reset(&client->dev, cy8ctmg110_shut_off, ts); + if (err) + return err; + + err = devm_request_threaded_irq(&client->dev, client->irq, + NULL, cy8ctmg110_irq_thread, + IRQF_ONESHOT, "touch_reset_key", ts); + if (err) { + dev_err(&client->dev, + "irq %d busy? error %d\n", client->irq, err); + return err; + } + + err = input_register_device(input_dev); + if (err) + return err; + + i2c_set_clientdata(client, ts); + + return 0; +} + +static int cy8ctmg110_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct cy8ctmg110 *ts = i2c_get_clientdata(client); + + if (!device_may_wakeup(&client->dev)) { + cy8ctmg110_set_sleepmode(ts, true); + cy8ctmg110_power(ts, false); + } + + return 0; +} + +static int cy8ctmg110_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct cy8ctmg110 *ts = i2c_get_clientdata(client); + + if (!device_may_wakeup(&client->dev)) { + cy8ctmg110_power(ts, true); + cy8ctmg110_set_sleepmode(ts, false); + } + + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, + cy8ctmg110_suspend, cy8ctmg110_resume); + +static const struct i2c_device_id cy8ctmg110_idtable[] = { + { CY8CTMG110_DRIVER_NAME, 1 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable); + +static struct i2c_driver cy8ctmg110_driver = { + .driver = { + .name = CY8CTMG110_DRIVER_NAME, + .pm = pm_sleep_ptr(&cy8ctmg110_pm), + }, + .id_table = cy8ctmg110_idtable, + .probe = cy8ctmg110_probe, +}; + +module_i2c_driver(cy8ctmg110_driver); + +MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>"); +MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver"); +MODULE_LICENSE("GPL v2"); |