+++ /dev/null
-/*
- * FocalTech FT6236 TouchScreen driver.
- *
- * Copyright (c) 2010 Focal tech Ltd.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * 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.
- */
-
-#include <linux/delay.h>
-#include <linux/gpio/consumer.h>
-#include <linux/i2c.h>
-#include <linux/input.h>
-#include <linux/input/mt.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-#include <linux/property.h>
-
-#define FT6236_MAX_TOUCH_POINTS 2
-
-#define FT6236_REG_TH_GROUP 0x80
-#define FT6236_REG_PERIODACTIVE 0x88
-#define FT6236_REG_LIB_VER_H 0xa1
-#define FT6236_REG_LIB_VER_L 0xa2
-#define FT6236_REG_CIPHER 0xa3
-#define FT6236_REG_FIRMID 0xa6
-#define FT6236_REG_FOCALTECH_ID 0xa8
-#define FT6236_REG_RELEASE_CODE_ID 0xaf
-
-#define FT6236_EVENT_PRESS_DOWN 0
-#define FT6236_EVENT_LIFT_UP 1
-#define FT6236_EVENT_CONTACT 2
-#define FT6236_EVENT_NO_EVENT 3
-
-struct ft6236_data {
- struct i2c_client *client;
- struct input_dev *input;
- struct gpio_desc *reset_gpio;
- u32 max_x;
- u32 max_y;
- bool invert_x;
- bool invert_y;
- bool swap_xy;
-};
-
-/*
- * This struct is a touchpoint as stored in hardware. Note that the id,
- * as well as the event, are stored in the upper nybble of the hi byte.
- */
-struct ft6236_touchpoint {
- union {
- u8 xhi;
- u8 event;
- };
- u8 xlo;
- union {
- u8 yhi;
- u8 id;
- };
- u8 ylo;
- u8 weight;
- u8 misc;
-} __packed;
-
-/* This packet represents the register map as read from offset 0 */
-struct ft6236_packet {
- u8 dev_mode;
- u8 gest_id;
- u8 touches;
- struct ft6236_touchpoint points[FT6236_MAX_TOUCH_POINTS];
-} __packed;
-
-static int ft6236_read(struct i2c_client *client, u8 reg, u8 len, void *data)
-{
- int error;
-
- error = i2c_smbus_read_i2c_block_data(client, reg, len, data);
- if (error < 0)
- return error;
-
- if (error != len)
- return -EIO;
-
- return 0;
-}
-
-static irqreturn_t ft6236_interrupt(int irq, void *dev_id)
-{
- struct ft6236_data *ft6236 = dev_id;
- struct device *dev = &ft6236->client->dev;
- struct input_dev *input = ft6236->input;
- struct ft6236_packet buf;
- u8 touches;
- int i, error;
-
- error = ft6236_read(ft6236->client, 0, sizeof(buf), &buf);
- if (error) {
- dev_err(dev, "read touchdata failed %d\n", error);
- return IRQ_HANDLED;
- }
-
- touches = buf.touches & 0xf;
- if (touches > FT6236_MAX_TOUCH_POINTS) {
- dev_dbg(dev,
- "%d touch points reported, only %d are supported\n",
- touches, FT6236_MAX_TOUCH_POINTS);
- touches = FT6236_MAX_TOUCH_POINTS;
- }
-
- for (i = 0; i < touches; i++) {
- struct ft6236_touchpoint *point = &buf.points[i];
- u16 x = ((point->xhi & 0xf) << 8) | buf.points[i].xlo;
- u16 y = ((point->yhi & 0xf) << 8) | buf.points[i].ylo;
- u8 event = point->event >> 6;
- u8 id = point->id >> 4;
- bool act = (event == FT6236_EVENT_PRESS_DOWN ||
- event == FT6236_EVENT_CONTACT);
-
- input_mt_slot(input, id);
- input_mt_report_slot_state(input, MT_TOOL_FINGER, act);
- if (!act)
- continue;
-
- if (ft6236->invert_x)
- x = ft6236->max_x - x;
-
- if (ft6236->invert_y)
- y = ft6236->max_y - y;
-
- if (ft6236->swap_xy) {
- input_report_abs(input, ABS_MT_POSITION_X, y);
- input_report_abs(input, ABS_MT_POSITION_Y, x);
- } else {
- input_report_abs(input, ABS_MT_POSITION_X, x);
- input_report_abs(input, ABS_MT_POSITION_Y, y);
- }
- }
-
- input_mt_sync_frame(input);
- input_sync(input);
-
- return IRQ_HANDLED;
-}
-
-static u8 ft6236_debug_read_byte(struct ft6236_data *ft6236, u8 reg)
-{
- struct i2c_client *client = ft6236->client;
- u8 val = 0;
- int error;
-
- error = ft6236_read(client, reg, 1, &val);
- if (error)
- dev_dbg(&client->dev,
- "error reading register 0x%02x: %d\n", reg, error);
-
- return val;
-}
-
-static void ft6236_debug_info(struct ft6236_data *ft6236)
-{
- struct device *dev = &ft6236->client->dev;
-
- dev_dbg(dev, "Touch threshold is %d\n",
- ft6236_debug_read_byte(ft6236, FT6236_REG_TH_GROUP) * 4);
- dev_dbg(dev, "Report rate is %dHz\n",
- ft6236_debug_read_byte(ft6236, FT6236_REG_PERIODACTIVE) * 10);
- dev_dbg(dev, "Firmware library version 0x%02x%02x\n",
- ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_H),
- ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_L));
- dev_dbg(dev, "Firmware version 0x%02x\n",
- ft6236_debug_read_byte(ft6236, FT6236_REG_FIRMID));
- dev_dbg(dev, "Chip vendor ID 0x%02x\n",
- ft6236_debug_read_byte(ft6236, FT6236_REG_CIPHER));
- dev_dbg(dev, "CTPM vendor ID 0x%02x\n",
- ft6236_debug_read_byte(ft6236, FT6236_REG_FOCALTECH_ID));
- dev_dbg(dev, "Release code version 0x%02x\n",
- ft6236_debug_read_byte(ft6236, FT6236_REG_RELEASE_CODE_ID));
-}
-
-static void ft6236_reset(struct ft6236_data *ft6236)
-{
- if (!ft6236->reset_gpio)
- return;
-
- gpiod_set_value_cansleep(ft6236->reset_gpio, 1);
- usleep_range(5000, 20000);
- gpiod_set_value_cansleep(ft6236->reset_gpio, 0);
- msleep(300);
-}
-
-static int ft6236_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct device *dev = &client->dev;
- struct ft6236_data *ft6236;
- struct input_dev *input;
- u32 fuzz_x = 0, fuzz_y = 0;
- u8 val;
- int error;
-
- if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
- return -ENXIO;
-
- if (!client->irq) {
- dev_err(dev, "irq is missing\n");
- return -EINVAL;
- }
-
- ft6236 = devm_kzalloc(dev, sizeof(*ft6236), GFP_KERNEL);
- if (!ft6236)
- return -ENOMEM;
-
- ft6236->client = client;
- ft6236->reset_gpio = devm_gpiod_get_optional(dev, "reset",
- GPIOD_OUT_LOW);
- if (IS_ERR(ft6236->reset_gpio)) {
- error = PTR_ERR(ft6236->reset_gpio);
- if (error != -EPROBE_DEFER)
- dev_err(dev, "error getting reset gpio: %d\n", error);
- return error;
- }
-
- ft6236_reset(ft6236);
-
- /* verify that the controller is present */
- error = ft6236_read(client, 0x00, 1, &val);
- if (error) {
- dev_err(dev, "failed to read from controller: %d\n", error);
- return error;
- }
-
- ft6236_debug_info(ft6236);
-
- input = devm_input_allocate_device(dev);
- if (!input)
- return -ENOMEM;
-
- ft6236->input = input;
- input->name = client->name;
- input->id.bustype = BUS_I2C;
-
- if (device_property_read_u32(dev, "touchscreen-size-x",
- &ft6236->max_x) ||
- device_property_read_u32(dev, "touchscreen-size-y",
- &ft6236->max_y)) {
- dev_err(dev, "touchscreen-size-x and/or -y missing\n");
- return -EINVAL;
- }
-
- device_property_read_u32(dev, "touchscreen-fuzz-x", &fuzz_x);
- device_property_read_u32(dev, "touchscreen-fuzz-y", &fuzz_y);
- ft6236->invert_x = device_property_read_bool(dev,
- "touchscreen-inverted-x");
- ft6236->invert_y = device_property_read_bool(dev,
- "touchscreen-inverted-y");
- ft6236->swap_xy = device_property_read_bool(dev,
- "touchscreen-swapped-x-y");
-
- if (ft6236->swap_xy) {
- input_set_abs_params(input, ABS_MT_POSITION_X, 0,
- ft6236->max_y, fuzz_y, 0);
- input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
- ft6236->max_x, fuzz_x, 0);
- } else {
- input_set_abs_params(input, ABS_MT_POSITION_X, 0,
- ft6236->max_x, fuzz_x, 0);
- input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
- ft6236->max_y, fuzz_y, 0);
- }
-
- error = input_mt_init_slots(input, FT6236_MAX_TOUCH_POINTS,
- INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
- if (error)
- return error;
-
- error = devm_request_threaded_irq(dev, client->irq, NULL,
- ft6236_interrupt, IRQF_ONESHOT,
- client->name, ft6236);
- if (error) {
- dev_err(dev, "request irq %d failed: %d\n", client->irq, error);
- return error;
- }
-
- error = input_register_device(input);
- if (error) {
- dev_err(dev, "failed to register input device: %d\n", error);
- return error;
- }
-
- return 0;
-}
-
-#ifdef CONFIG_OF
-static const struct of_device_id ft6236_of_match[] = {
- { .compatible = "focaltech,ft6236", },
- { }
-};
-MODULE_DEVICE_TABLE(of, ft6236_of_match);
-#endif
-
-static const struct i2c_device_id ft6236_id[] = {
- { "ft6236", },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, ft6236_id);
-
-static struct i2c_driver ft6236_driver = {
- .driver = {
- .name = "ft6236",
- .of_match_table = of_match_ptr(ft6236_of_match),
- },
- .probe = ft6236_probe,
- .id_table = ft6236_id,
-};
-module_i2c_driver(ft6236_driver);
-
-MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
-MODULE_AUTHOR("Noralf Trønnes <noralf@tronnes.org>");
-MODULE_DESCRIPTION("FocalTech FT6236 TouchScreen driver");
-MODULE_LICENSE("GPL v2");
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