forked from mirrors/linux
16ab4f43eb
This is required to specify generic touchscreen properties via DT. Signed-off-by: Matthias Fend <matthias.fend@wolfvision.net> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
344 lines
8.2 KiB
C
344 lines
8.2 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/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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#include <linux/input/touchscreen.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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struct st1232_ts_finger {
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u16 x;
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u16 y;
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u8 t;
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bool is_valid;
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};
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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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struct st1232_ts_finger *finger;
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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 st1232_ts_finger *finger = ts->finger;
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struct i2c_client *client = ts->client;
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struct i2c_msg msg[2];
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int error;
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int i, y;
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u8 start_reg = ts->chip_info->start_reg;
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u8 *buf = ts->read_buf;
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/* read touchscreen data */
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msg[0].addr = client->addr;
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msg[0].flags = 0;
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msg[0].len = 1;
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msg[0].buf = &start_reg;
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msg[1].addr = ts->client->addr;
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msg[1].flags = I2C_M_RD;
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msg[1].len = ts->read_buf_len;
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msg[1].buf = buf;
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error = i2c_transfer(client->adapter, msg, 2);
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if (error < 0)
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return error;
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for (i = 0, y = 0; i < ts->chip_info->max_fingers; i++, y += 3) {
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finger[i].is_valid = buf[i + y] >> 7;
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if (finger[i].is_valid) {
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finger[i].x = ((buf[i + y] & 0x0070) << 4) | buf[i + 1];
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finger[i].y = ((buf[i + y] & 0x0007) << 8) | buf[i + 2];
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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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finger[i].t = buf[i + 6];
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}
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}
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return 0;
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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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struct st1232_ts_finger *finger = ts->finger;
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struct input_dev *input_dev = ts->input_dev;
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int count = 0;
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int i, ret;
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ret = st1232_ts_read_data(ts);
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if (ret < 0)
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goto end;
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/* multi touch protocol */
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for (i = 0; i < ts->chip_info->max_fingers; i++) {
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if (!finger[i].is_valid)
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continue;
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if (ts->chip_info->have_z)
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input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
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finger[i].t);
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touchscreen_report_pos(input_dev, &ts->prop,
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finger[i].x, finger[i].y, true);
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input_mt_sync(input_dev);
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count++;
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}
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/* SYN_MT_REPORT only if no contact */
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if (!count) {
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input_mt_sync(input_dev);
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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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/* SYN_REPORT */
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input_sync(input_dev);
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end:
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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 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 st1232_ts_finger *finger;
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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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ts->finger = devm_kcalloc(&client->dev,
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ts->chip_info->max_fingers, sizeof(*finger),
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GFP_KERNEL);
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if (!ts->finger)
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return -ENOMEM;
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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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input_dev->name = "st1232-touchscreen";
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input_dev->id.bustype = BUS_I2C;
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input_dev->dev.parent = &client->dev;
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__set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
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__set_bit(EV_SYN, input_dev->evbit);
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__set_bit(EV_KEY, input_dev->evbit);
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__set_bit(EV_ABS, input_dev->evbit);
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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 = 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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device_init_wakeup(&client->dev, 1);
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return 0;
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}
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static int st1232_ts_remove(struct i2c_client *client)
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{
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struct st1232_ts_data *ts = i2c_get_clientdata(client);
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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_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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if (device_may_wakeup(&client->dev)) {
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enable_irq_wake(client->irq);
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} else {
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disable_irq(client->irq);
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st1232_ts_power(ts, false);
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}
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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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disable_irq_wake(client->irq);
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} else {
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st1232_ts_power(ts, true);
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enable_irq(client->irq);
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}
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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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.remove = st1232_ts_remove,
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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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