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