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a1b92973fb
Switch the driver to the slotted variant of multitouch protocol (MT-B) with in-kernel tracking of the contacts. Tested-by: Matthias Fend <Matthias.Fend@wolfvision.net> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
341 lines
8.1 KiB
C
341 lines
8.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ST1232 Touchscreen Controller Driver
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*
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* Copyright (C) 2010 Renesas Solutions Corp.
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* Tony SIM <chinyeow.sim.xt@renesas.com>
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*
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* Using code from:
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* - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
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* Copyright (C) 2007 Google, Inc.
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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/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/pm_qos.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define ST1232_TS_NAME "st1232-ts"
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#define ST1633_TS_NAME "st1633-ts"
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#define ST_TS_MAX_FINGERS 10
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struct st_chip_info {
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bool have_z;
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u16 max_x;
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u16 max_y;
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u16 max_area;
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u16 max_fingers;
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u8 start_reg;
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};
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struct st1232_ts_data {
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struct i2c_client *client;
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struct input_dev *input_dev;
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struct touchscreen_properties prop;
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struct dev_pm_qos_request low_latency_req;
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struct gpio_desc *reset_gpio;
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const struct st_chip_info *chip_info;
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int read_buf_len;
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u8 *read_buf;
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};
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static int st1232_ts_read_data(struct st1232_ts_data *ts)
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{
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struct i2c_client *client = ts->client;
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u8 start_reg = ts->chip_info->start_reg;
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struct i2c_msg msg[] = {
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{
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.addr = client->addr,
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.len = sizeof(start_reg),
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.buf = &start_reg,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD | I2C_M_DMA_SAFE,
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.len = ts->read_buf_len,
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.buf = ts->read_buf,
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}
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};
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int ret;
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ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
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if (ret != ARRAY_SIZE(msg))
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return ret < 0 ? ret : -EIO;
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return 0;
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}
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static int st1232_ts_parse_and_report(struct st1232_ts_data *ts)
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{
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struct input_dev *input = ts->input_dev;
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struct input_mt_pos pos[ST_TS_MAX_FINGERS];
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u8 z[ST_TS_MAX_FINGERS];
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int slots[ST_TS_MAX_FINGERS];
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int n_contacts = 0;
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int i;
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for (i = 0; i < ts->chip_info->max_fingers; i++) {
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u8 *buf = &ts->read_buf[i * 4];
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if (buf[0] & BIT(7)) {
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unsigned int x = ((buf[0] & 0x70) << 4) | buf[1];
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unsigned int y = ((buf[0] & 0x07) << 8) | buf[2];
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touchscreen_set_mt_pos(&pos[n_contacts],
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&ts->prop, x, y);
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/* st1232 includes a z-axis / touch strength */
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if (ts->chip_info->have_z)
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z[n_contacts] = ts->read_buf[i + 6];
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n_contacts++;
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}
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}
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input_mt_assign_slots(input, slots, pos, n_contacts, 0);
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for (i = 0; i < n_contacts; i++) {
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input_mt_slot(input, slots[i]);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
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input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
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input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
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if (ts->chip_info->have_z)
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input_report_abs(input, ABS_MT_TOUCH_MAJOR, z[i]);
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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 n_contacts;
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}
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static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
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{
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struct st1232_ts_data *ts = dev_id;
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int count;
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int error;
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error = st1232_ts_read_data(ts);
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if (error)
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goto out;
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count = st1232_ts_parse_and_report(ts);
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if (!count) {
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if (ts->low_latency_req.dev) {
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dev_pm_qos_remove_request(&ts->low_latency_req);
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ts->low_latency_req.dev = NULL;
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}
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} else if (!ts->low_latency_req.dev) {
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/* First contact, request 100 us latency. */
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dev_pm_qos_add_ancestor_request(&ts->client->dev,
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&ts->low_latency_req,
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DEV_PM_QOS_RESUME_LATENCY, 100);
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}
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out:
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return IRQ_HANDLED;
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}
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static void st1232_ts_power(struct st1232_ts_data *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 void st1232_ts_power_off(void *data)
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{
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st1232_ts_power(data, false);
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}
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static const struct st_chip_info st1232_chip_info = {
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.have_z = true,
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.max_x = 0x31f, /* 800 - 1 */
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.max_y = 0x1df, /* 480 -1 */
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.max_area = 0xff,
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.max_fingers = 2,
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.start_reg = 0x12,
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};
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static const struct st_chip_info st1633_chip_info = {
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.have_z = false,
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.max_x = 0x13f, /* 320 - 1 */
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.max_y = 0x1df, /* 480 -1 */
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.max_area = 0x00,
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.max_fingers = 5,
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.start_reg = 0x12,
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};
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static int st1232_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct st_chip_info *match;
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struct st1232_ts_data *ts;
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struct input_dev *input_dev;
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int error;
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match = device_get_match_data(&client->dev);
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if (!match && id)
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match = (const void *)id->driver_data;
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if (!match) {
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dev_err(&client->dev, "unknown device model\n");
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return -ENODEV;
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}
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "need I2C_FUNC_I2C\n");
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return -EIO;
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}
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if (!client->irq) {
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dev_err(&client->dev, "no IRQ?\n");
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return -EINVAL;
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}
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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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ts->chip_info = match;
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/* allocate a buffer according to the number of registers to read */
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ts->read_buf_len = ts->chip_info->max_fingers * 4;
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ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
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if (!ts->read_buf)
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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_dev = input_dev;
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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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error = PTR_ERR(ts->reset_gpio);
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dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",
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error);
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return error;
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}
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st1232_ts_power(ts, true);
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error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);
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if (error) {
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dev_err(&client->dev,
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"Failed to install power off action: %d\n", error);
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return error;
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}
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input_dev->name = "st1232-touchscreen";
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input_dev->id.bustype = BUS_I2C;
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if (ts->chip_info->have_z)
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input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
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ts->chip_info->max_area, 0, 0);
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input_set_abs_params(input_dev, ABS_MT_POSITION_X,
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0, ts->chip_info->max_x, 0, 0);
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input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
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0, ts->chip_info->max_y, 0, 0);
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touchscreen_parse_properties(input_dev, true, &ts->prop);
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error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers,
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INPUT_MT_DIRECT | INPUT_MT_TRACK |
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INPUT_MT_DROP_UNUSED);
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if (error) {
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dev_err(&client->dev, "failed to initialize MT slots\n");
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return error;
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}
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error = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, st1232_ts_irq_handler,
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IRQF_ONESHOT,
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client->name, ts);
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if (error) {
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dev_err(&client->dev, "Failed to register interrupt\n");
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return error;
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}
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error = input_register_device(ts->input_dev);
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if (error) {
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dev_err(&client->dev, "Unable to register %s input device\n",
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input_dev->name);
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return error;
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}
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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 st1232_ts_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 st1232_ts_data *ts = i2c_get_clientdata(client);
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disable_irq(client->irq);
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if (!device_may_wakeup(&client->dev))
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st1232_ts_power(ts, false);
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return 0;
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}
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static int __maybe_unused st1232_ts_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 st1232_ts_data *ts = i2c_get_clientdata(client);
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if (!device_may_wakeup(&client->dev))
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st1232_ts_power(ts, true);
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enable_irq(client->irq);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
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st1232_ts_suspend, st1232_ts_resume);
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static const struct i2c_device_id st1232_ts_id[] = {
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{ ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
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{ ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
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static const struct of_device_id st1232_ts_dt_ids[] = {
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{ .compatible = "sitronix,st1232", .data = &st1232_chip_info },
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{ .compatible = "sitronix,st1633", .data = &st1633_chip_info },
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{ }
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};
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MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
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static struct i2c_driver st1232_ts_driver = {
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.probe = st1232_ts_probe,
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.id_table = st1232_ts_id,
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.driver = {
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.name = ST1232_TS_NAME,
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.of_match_table = st1232_ts_dt_ids,
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.pm = &st1232_ts_pm_ops,
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},
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};
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module_i2c_driver(st1232_ts_driver);
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MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
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MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
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MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
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MODULE_LICENSE("GPL v2");
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