| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * ST1232 Touchscreen Controller Driver |
| * |
| * Copyright (C) 2010 Renesas Solutions Corp. |
| * Tony SIM <chinyeow.sim.xt@renesas.com> |
| * |
| * Using code from: |
| * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c |
| * Copyright (C) 2007 Google, Inc. |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/i2c.h> |
| #include <linux/input.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/pm_qos.h> |
| #include <linux/slab.h> |
| #include <linux/types.h> |
| #include <linux/input/touchscreen.h> |
| |
| #define ST1232_TS_NAME "st1232-ts" |
| #define ST1633_TS_NAME "st1633-ts" |
| |
| struct st1232_ts_finger { |
| u16 x; |
| u16 y; |
| u8 t; |
| bool is_valid; |
| }; |
| |
| struct st_chip_info { |
| bool have_z; |
| u16 max_x; |
| u16 max_y; |
| u16 max_area; |
| u16 max_fingers; |
| u8 start_reg; |
| }; |
| |
| struct st1232_ts_data { |
| struct i2c_client *client; |
| struct input_dev *input_dev; |
| struct touchscreen_properties prop; |
| struct dev_pm_qos_request low_latency_req; |
| struct gpio_desc *reset_gpio; |
| const struct st_chip_info *chip_info; |
| int read_buf_len; |
| u8 *read_buf; |
| struct st1232_ts_finger *finger; |
| }; |
| |
| static int st1232_ts_read_data(struct st1232_ts_data *ts) |
| { |
| struct st1232_ts_finger *finger = ts->finger; |
| struct i2c_client *client = ts->client; |
| struct i2c_msg msg[2]; |
| int error; |
| int i, y; |
| u8 start_reg = ts->chip_info->start_reg; |
| u8 *buf = ts->read_buf; |
| |
| /* read touchscreen data */ |
| msg[0].addr = client->addr; |
| msg[0].flags = 0; |
| msg[0].len = 1; |
| msg[0].buf = &start_reg; |
| |
| msg[1].addr = ts->client->addr; |
| msg[1].flags = I2C_M_RD; |
| msg[1].len = ts->read_buf_len; |
| msg[1].buf = buf; |
| |
| error = i2c_transfer(client->adapter, msg, 2); |
| if (error < 0) |
| return error; |
| |
| for (i = 0, y = 0; i < ts->chip_info->max_fingers; i++, y += 3) { |
| finger[i].is_valid = buf[i + y] >> 7; |
| if (finger[i].is_valid) { |
| finger[i].x = ((buf[i + y] & 0x0070) << 4) | buf[i + 1]; |
| finger[i].y = ((buf[i + y] & 0x0007) << 8) | buf[i + 2]; |
| |
| /* st1232 includes a z-axis / touch strength */ |
| if (ts->chip_info->have_z) |
| finger[i].t = buf[i + 6]; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) |
| { |
| struct st1232_ts_data *ts = dev_id; |
| struct st1232_ts_finger *finger = ts->finger; |
| struct input_dev *input_dev = ts->input_dev; |
| int count = 0; |
| int i, ret; |
| |
| ret = st1232_ts_read_data(ts); |
| if (ret < 0) |
| goto end; |
| |
| /* multi touch protocol */ |
| for (i = 0; i < ts->chip_info->max_fingers; i++) { |
| if (!finger[i].is_valid) |
| continue; |
| |
| if (ts->chip_info->have_z) |
| input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, |
| finger[i].t); |
| |
| touchscreen_report_pos(input_dev, &ts->prop, |
| finger[i].x, finger[i].y, true); |
| input_mt_sync(input_dev); |
| count++; |
| } |
| |
| /* SYN_MT_REPORT only if no contact */ |
| if (!count) { |
| input_mt_sync(input_dev); |
| if (ts->low_latency_req.dev) { |
| dev_pm_qos_remove_request(&ts->low_latency_req); |
| ts->low_latency_req.dev = NULL; |
| } |
| } else if (!ts->low_latency_req.dev) { |
| /* First contact, request 100 us latency. */ |
| dev_pm_qos_add_ancestor_request(&ts->client->dev, |
| &ts->low_latency_req, |
| DEV_PM_QOS_RESUME_LATENCY, 100); |
| } |
| |
| /* SYN_REPORT */ |
| input_sync(input_dev); |
| |
| end: |
| return IRQ_HANDLED; |
| } |
| |
| static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron) |
| { |
| if (ts->reset_gpio) |
| gpiod_set_value_cansleep(ts->reset_gpio, !poweron); |
| } |
| |
| static const struct st_chip_info st1232_chip_info = { |
| .have_z = true, |
| .max_x = 0x31f, /* 800 - 1 */ |
| .max_y = 0x1df, /* 480 -1 */ |
| .max_area = 0xff, |
| .max_fingers = 2, |
| .start_reg = 0x12, |
| }; |
| |
| static const struct st_chip_info st1633_chip_info = { |
| .have_z = false, |
| .max_x = 0x13f, /* 320 - 1 */ |
| .max_y = 0x1df, /* 480 -1 */ |
| .max_area = 0x00, |
| .max_fingers = 5, |
| .start_reg = 0x12, |
| }; |
| |
| static int st1232_ts_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| const struct st_chip_info *match; |
| struct st1232_ts_data *ts; |
| struct st1232_ts_finger *finger; |
| struct input_dev *input_dev; |
| int error; |
| |
| match = device_get_match_data(&client->dev); |
| if (!match && id) |
| match = (const void *)id->driver_data; |
| if (!match) { |
| dev_err(&client->dev, "unknown device model\n"); |
| return -ENODEV; |
| } |
| |
| if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| dev_err(&client->dev, "need I2C_FUNC_I2C\n"); |
| return -EIO; |
| } |
| |
| if (!client->irq) { |
| dev_err(&client->dev, "no IRQ?\n"); |
| return -EINVAL; |
| } |
| |
| ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); |
| if (!ts) |
| return -ENOMEM; |
| |
| ts->chip_info = match; |
| ts->finger = devm_kcalloc(&client->dev, |
| ts->chip_info->max_fingers, sizeof(*finger), |
| GFP_KERNEL); |
| if (!ts->finger) |
| return -ENOMEM; |
| |
| /* allocate a buffer according to the number of registers to read */ |
| ts->read_buf_len = ts->chip_info->max_fingers * 4; |
| ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL); |
| if (!ts->read_buf) |
| return -ENOMEM; |
| |
| input_dev = devm_input_allocate_device(&client->dev); |
| if (!input_dev) |
| return -ENOMEM; |
| |
| ts->client = client; |
| ts->input_dev = input_dev; |
| |
| ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL, |
| GPIOD_OUT_HIGH); |
| if (IS_ERR(ts->reset_gpio)) { |
| error = PTR_ERR(ts->reset_gpio); |
| dev_err(&client->dev, "Unable to request GPIO pin: %d.\n", |
| error); |
| return error; |
| } |
| |
| st1232_ts_power(ts, true); |
| |
| input_dev->name = "st1232-touchscreen"; |
| input_dev->id.bustype = BUS_I2C; |
| input_dev->dev.parent = &client->dev; |
| |
| __set_bit(INPUT_PROP_DIRECT, input_dev->propbit); |
| __set_bit(EV_SYN, input_dev->evbit); |
| __set_bit(EV_KEY, input_dev->evbit); |
| __set_bit(EV_ABS, input_dev->evbit); |
| |
| if (ts->chip_info->have_z) |
| input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, |
| ts->chip_info->max_area, 0, 0); |
| |
| input_set_abs_params(input_dev, ABS_MT_POSITION_X, |
| 0, ts->chip_info->max_x, 0, 0); |
| input_set_abs_params(input_dev, ABS_MT_POSITION_Y, |
| 0, ts->chip_info->max_y, 0, 0); |
| |
| touchscreen_parse_properties(input_dev, true, &ts->prop); |
| |
| error = devm_request_threaded_irq(&client->dev, client->irq, |
| NULL, st1232_ts_irq_handler, |
| IRQF_ONESHOT, |
| client->name, ts); |
| if (error) { |
| dev_err(&client->dev, "Failed to register interrupt\n"); |
| return error; |
| } |
| |
| error = input_register_device(ts->input_dev); |
| if (error) { |
| dev_err(&client->dev, "Unable to register %s input device\n", |
| input_dev->name); |
| return error; |
| } |
| |
| i2c_set_clientdata(client, ts); |
| device_init_wakeup(&client->dev, 1); |
| |
| return 0; |
| } |
| |
| static int st1232_ts_remove(struct i2c_client *client) |
| { |
| struct st1232_ts_data *ts = i2c_get_clientdata(client); |
| |
| st1232_ts_power(ts, false); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused st1232_ts_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct st1232_ts_data *ts = i2c_get_clientdata(client); |
| |
| if (device_may_wakeup(&client->dev)) { |
| enable_irq_wake(client->irq); |
| } else { |
| disable_irq(client->irq); |
| st1232_ts_power(ts, false); |
| } |
| |
| return 0; |
| } |
| |
| static int __maybe_unused st1232_ts_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct st1232_ts_data *ts = i2c_get_clientdata(client); |
| |
| if (device_may_wakeup(&client->dev)) { |
| disable_irq_wake(client->irq); |
| } else { |
| st1232_ts_power(ts, true); |
| enable_irq(client->irq); |
| } |
| |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops, |
| st1232_ts_suspend, st1232_ts_resume); |
| |
| static const struct i2c_device_id st1232_ts_id[] = { |
| { ST1232_TS_NAME, (unsigned long)&st1232_chip_info }, |
| { ST1633_TS_NAME, (unsigned long)&st1633_chip_info }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, st1232_ts_id); |
| |
| static const struct of_device_id st1232_ts_dt_ids[] = { |
| { .compatible = "sitronix,st1232", .data = &st1232_chip_info }, |
| { .compatible = "sitronix,st1633", .data = &st1633_chip_info }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids); |
| |
| static struct i2c_driver st1232_ts_driver = { |
| .probe = st1232_ts_probe, |
| .remove = st1232_ts_remove, |
| .id_table = st1232_ts_id, |
| .driver = { |
| .name = ST1232_TS_NAME, |
| .of_match_table = st1232_ts_dt_ids, |
| .pm = &st1232_ts_pm_ops, |
| }, |
| }; |
| |
| module_i2c_driver(st1232_ts_driver); |
| |
| MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>"); |
| MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>"); |
| MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver"); |
| MODULE_LICENSE("GPL v2"); |