diff options
Diffstat (limited to 'drivers/input/touchscreen/egalax_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/egalax_ts.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c new file mode 100644 index 0000000000..a7f7e73082 --- /dev/null +++ b/drivers/input/touchscreen/egalax_ts.c @@ -0,0 +1,274 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for EETI eGalax Multiple Touch Controller + * + * Copyright (C) 2011 Freescale Semiconductor, Inc. + * + * based on max11801_ts.c + */ + +/* EETI eGalax serial touch screen controller is a I2C based multiple + * touch screen controller, it supports 5 point multiple touch. */ + +/* TODO: + - auto idle mode support +*/ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/input.h> +#include <linux/irq.h> +#include <linux/gpio/consumer.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/bitops.h> +#include <linux/input/mt.h> + +/* + * Mouse Mode: some panel may configure the controller to mouse mode, + * which can only report one point at a given time. + * This driver will ignore events in this mode. + */ +#define REPORT_MODE_MOUSE 0x1 +/* + * Vendor Mode: this mode is used to transfer some vendor specific + * messages. + * This driver will ignore events in this mode. + */ +#define REPORT_MODE_VENDOR 0x3 +/* Multiple Touch Mode */ +#define REPORT_MODE_MTTOUCH 0x4 + +#define MAX_SUPPORT_POINTS 5 + +#define EVENT_VALID_OFFSET 7 +#define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET) +#define EVENT_ID_OFFSET 2 +#define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET) +#define EVENT_IN_RANGE (0x1 << 1) +#define EVENT_DOWN_UP (0X1 << 0) + +#define MAX_I2C_DATA_LEN 10 + +#define EGALAX_MAX_X 32760 +#define EGALAX_MAX_Y 32760 +#define EGALAX_MAX_TRIES 100 + +struct egalax_ts { + struct i2c_client *client; + struct input_dev *input_dev; +}; + +static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id) +{ + struct egalax_ts *ts = dev_id; + struct input_dev *input_dev = ts->input_dev; + struct i2c_client *client = ts->client; + u8 buf[MAX_I2C_DATA_LEN]; + int id, ret, x, y, z; + int tries = 0; + bool down, valid; + u8 state; + + do { + ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN); + } while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES); + + if (ret < 0) + return IRQ_HANDLED; + + if (buf[0] != REPORT_MODE_MTTOUCH) { + /* ignore mouse events and vendor events */ + return IRQ_HANDLED; + } + + state = buf[1]; + x = (buf[3] << 8) | buf[2]; + y = (buf[5] << 8) | buf[4]; + z = (buf[7] << 8) | buf[6]; + + valid = state & EVENT_VALID_MASK; + id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET; + down = state & EVENT_DOWN_UP; + + if (!valid || id > MAX_SUPPORT_POINTS) { + dev_dbg(&client->dev, "point invalid\n"); + return IRQ_HANDLED; + } + + input_mt_slot(input_dev, id); + input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down); + + dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d", + down ? "down" : "up", id, x, y, z); + + if (down) { + input_report_abs(input_dev, ABS_MT_POSITION_X, x); + input_report_abs(input_dev, ABS_MT_POSITION_Y, y); + input_report_abs(input_dev, ABS_MT_PRESSURE, z); + } + + input_mt_report_pointer_emulation(input_dev, true); + input_sync(input_dev); + + return IRQ_HANDLED; +} + +/* wake up controller by an falling edge of interrupt gpio. */ +static int egalax_wake_up_device(struct i2c_client *client) +{ + struct gpio_desc *gpio; + int ret; + + /* wake up controller via an falling edge on IRQ gpio. */ + gpio = gpiod_get(&client->dev, "wakeup", GPIOD_OUT_HIGH); + ret = PTR_ERR_OR_ZERO(gpio); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&client->dev, + "failed to request wakeup gpio, cannot wake up controller: %d\n", + ret); + return ret; + } + + /* release the line */ + gpiod_set_value_cansleep(gpio, 0); + + /* controller should be woken up, return irq. */ + gpiod_direction_input(gpio); + gpiod_put(gpio); + + return 0; +} + +static int egalax_firmware_version(struct i2c_client *client) +{ + static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 }; + int ret; + + ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN); + if (ret < 0) + return ret; + + return 0; +} + +static int egalax_ts_probe(struct i2c_client *client) +{ + struct egalax_ts *ts; + struct input_dev *input_dev; + int error; + + ts = devm_kzalloc(&client->dev, sizeof(struct egalax_ts), GFP_KERNEL); + if (!ts) { + dev_err(&client->dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + input_dev = devm_input_allocate_device(&client->dev); + if (!input_dev) { + dev_err(&client->dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + ts->client = client; + ts->input_dev = input_dev; + + /* controller may be in sleep, wake it up. */ + error = egalax_wake_up_device(client); + if (error) + return error; + + error = egalax_firmware_version(client); + if (error < 0) { + dev_err(&client->dev, "Failed to read firmware version\n"); + return error; + } + + input_dev->name = "EETI eGalax Touch Screen"; + input_dev->id.bustype = BUS_I2C; + + __set_bit(EV_ABS, input_dev->evbit); + __set_bit(EV_KEY, input_dev->evbit); + __set_bit(BTN_TOUCH, input_dev->keybit); + + input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0); + input_set_abs_params(input_dev, + ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0); + input_set_abs_params(input_dev, + ABS_MT_POSITION_Y, 0, EGALAX_MAX_Y, 0, 0); + input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0); + + error = devm_request_threaded_irq(&client->dev, client->irq, + NULL, egalax_ts_interrupt, + IRQF_ONESHOT, "egalax_ts", ts); + if (error < 0) { + dev_err(&client->dev, "Failed to register interrupt\n"); + return error; + } + + error = input_register_device(ts->input_dev); + if (error) + return error; + + return 0; +} + +static const struct i2c_device_id egalax_ts_id[] = { + { "egalax_ts", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, egalax_ts_id); + +static int egalax_ts_suspend(struct device *dev) +{ + static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = { + 0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0 + }; + struct i2c_client *client = to_i2c_client(dev); + int ret; + + if (device_may_wakeup(dev)) + return enable_irq_wake(client->irq); + + ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN); + return ret > 0 ? 0 : ret; +} + +static int egalax_ts_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + + if (device_may_wakeup(dev)) + return disable_irq_wake(client->irq); + + return egalax_wake_up_device(client); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, + egalax_ts_suspend, egalax_ts_resume); + +static const struct of_device_id egalax_ts_dt_ids[] = { + { .compatible = "eeti,egalax_ts" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, egalax_ts_dt_ids); + +static struct i2c_driver egalax_ts_driver = { + .driver = { + .name = "egalax_ts", + .pm = pm_sleep_ptr(&egalax_ts_pm_ops), + .of_match_table = egalax_ts_dt_ids, + }, + .id_table = egalax_ts_id, + .probe = egalax_ts_probe, +}; + +module_i2c_driver(egalax_ts_driver); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller"); +MODULE_LICENSE("GPL"); |