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278 lines
6.7 KiB
278 lines
6.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Driver for ChipOne icn8318 i2c touchscreen controller |
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* |
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* Copyright (c) 2015 Red Hat Inc. |
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* |
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* Red Hat authors: |
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* Hans de Goede <[email protected]> |
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*/ |
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#include <linux/gpio/consumer.h> |
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#include <linux/interrupt.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/module.h> |
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#include <linux/of.h> |
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#define ICN8318_REG_POWER 4 |
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#define ICN8318_REG_TOUCHDATA 16 |
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#define ICN8318_POWER_ACTIVE 0 |
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#define ICN8318_POWER_MONITOR 1 |
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#define ICN8318_POWER_HIBERNATE 2 |
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#define ICN8318_MAX_TOUCHES 5 |
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struct icn8318_touch { |
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__u8 slot; |
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__be16 x; |
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__be16 y; |
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__u8 pressure; /* Seems more like finger width then pressure really */ |
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__u8 event; |
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/* The difference between 2 and 3 is unclear */ |
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#define ICN8318_EVENT_NO_DATA 1 /* No finger seen yet since wakeup */ |
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#define ICN8318_EVENT_UPDATE1 2 /* New or updated coordinates */ |
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#define ICN8318_EVENT_UPDATE2 3 /* New or updated coordinates */ |
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#define ICN8318_EVENT_END 4 /* Finger lifted */ |
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} __packed; |
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struct icn8318_touch_data { |
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__u8 softbutton; |
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__u8 touch_count; |
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struct icn8318_touch touches[ICN8318_MAX_TOUCHES]; |
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} __packed; |
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struct icn8318_data { |
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struct i2c_client *client; |
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struct input_dev *input; |
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struct gpio_desc *wake_gpio; |
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struct touchscreen_properties prop; |
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}; |
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static int icn8318_read_touch_data(struct i2c_client *client, |
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struct icn8318_touch_data *touch_data) |
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{ |
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u8 reg = ICN8318_REG_TOUCHDATA; |
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struct i2c_msg msg[2] = { |
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{ |
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.addr = client->addr, |
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.len = 1, |
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.buf = ® |
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}, |
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{ |
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.addr = client->addr, |
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.flags = I2C_M_RD, |
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.len = sizeof(struct icn8318_touch_data), |
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.buf = (u8 *)touch_data |
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} |
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}; |
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return i2c_transfer(client->adapter, msg, 2); |
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} |
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static inline bool icn8318_touch_active(u8 event) |
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{ |
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return (event == ICN8318_EVENT_UPDATE1) || |
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(event == ICN8318_EVENT_UPDATE2); |
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} |
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static irqreturn_t icn8318_irq(int irq, void *dev_id) |
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{ |
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struct icn8318_data *data = dev_id; |
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struct device *dev = &data->client->dev; |
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struct icn8318_touch_data touch_data; |
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int i, ret; |
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ret = icn8318_read_touch_data(data->client, &touch_data); |
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if (ret < 0) { |
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dev_err(dev, "Error reading touch data: %d\n", ret); |
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return IRQ_HANDLED; |
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} |
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if (touch_data.softbutton) { |
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/* |
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* Other data is invalid when a softbutton is pressed. |
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* This needs some extra devicetree bindings to map the icn8318 |
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* softbutton codes to evdev codes. Currently no known devices |
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* use this. |
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*/ |
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return IRQ_HANDLED; |
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} |
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if (touch_data.touch_count > ICN8318_MAX_TOUCHES) { |
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dev_warn(dev, "Too much touches %d > %d\n", |
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touch_data.touch_count, ICN8318_MAX_TOUCHES); |
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touch_data.touch_count = ICN8318_MAX_TOUCHES; |
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} |
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for (i = 0; i < touch_data.touch_count; i++) { |
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struct icn8318_touch *touch = &touch_data.touches[i]; |
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bool act = icn8318_touch_active(touch->event); |
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input_mt_slot(data->input, touch->slot); |
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input_mt_report_slot_state(data->input, MT_TOOL_FINGER, act); |
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if (!act) |
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continue; |
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touchscreen_report_pos(data->input, &data->prop, |
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be16_to_cpu(touch->x), |
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be16_to_cpu(touch->y), true); |
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} |
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input_mt_sync_frame(data->input); |
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input_sync(data->input); |
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return IRQ_HANDLED; |
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} |
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static int icn8318_start(struct input_dev *dev) |
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{ |
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struct icn8318_data *data = input_get_drvdata(dev); |
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enable_irq(data->client->irq); |
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gpiod_set_value_cansleep(data->wake_gpio, 1); |
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return 0; |
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} |
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static void icn8318_stop(struct input_dev *dev) |
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{ |
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struct icn8318_data *data = input_get_drvdata(dev); |
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disable_irq(data->client->irq); |
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i2c_smbus_write_byte_data(data->client, ICN8318_REG_POWER, |
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ICN8318_POWER_HIBERNATE); |
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gpiod_set_value_cansleep(data->wake_gpio, 0); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int icn8318_suspend(struct device *dev) |
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{ |
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struct icn8318_data *data = i2c_get_clientdata(to_i2c_client(dev)); |
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mutex_lock(&data->input->mutex); |
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if (input_device_enabled(data->input)) |
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icn8318_stop(data->input); |
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mutex_unlock(&data->input->mutex); |
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return 0; |
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} |
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static int icn8318_resume(struct device *dev) |
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{ |
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struct icn8318_data *data = i2c_get_clientdata(to_i2c_client(dev)); |
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mutex_lock(&data->input->mutex); |
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if (input_device_enabled(data->input)) |
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icn8318_start(data->input); |
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mutex_unlock(&data->input->mutex); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(icn8318_pm_ops, icn8318_suspend, icn8318_resume); |
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static int icn8318_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 icn8318_data *data; |
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struct input_dev *input; |
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int error; |
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if (!client->irq) { |
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dev_err(dev, "Error no irq specified\n"); |
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return -EINVAL; |
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} |
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->wake_gpio = devm_gpiod_get(dev, "wake", GPIOD_OUT_LOW); |
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if (IS_ERR(data->wake_gpio)) { |
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error = PTR_ERR(data->wake_gpio); |
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if (error != -EPROBE_DEFER) |
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dev_err(dev, "Error getting wake gpio: %d\n", error); |
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return error; |
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} |
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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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input->name = client->name; |
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input->id.bustype = BUS_I2C; |
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input->open = icn8318_start; |
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input->close = icn8318_stop; |
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input->dev.parent = dev; |
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input_set_capability(input, EV_ABS, ABS_MT_POSITION_X); |
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input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y); |
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touchscreen_parse_properties(input, true, &data->prop); |
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if (!input_abs_get_max(input, ABS_MT_POSITION_X) || |
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!input_abs_get_max(input, ABS_MT_POSITION_Y)) { |
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dev_err(dev, "Error touchscreen-size-x and/or -y missing\n"); |
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return -EINVAL; |
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} |
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error = input_mt_init_slots(input, ICN8318_MAX_TOUCHES, |
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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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data->client = client; |
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data->input = input; |
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input_set_drvdata(input, data); |
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error = devm_request_threaded_irq(dev, client->irq, NULL, icn8318_irq, |
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IRQF_ONESHOT, client->name, data); |
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if (error) { |
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dev_err(dev, "Error requesting irq: %d\n", error); |
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return error; |
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} |
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/* Stop device till opened */ |
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icn8318_stop(data->input); |
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error = input_register_device(input); |
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if (error) |
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return error; |
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i2c_set_clientdata(client, data); |
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return 0; |
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} |
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static const struct of_device_id icn8318_of_match[] = { |
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{ .compatible = "chipone,icn8318" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, icn8318_of_match); |
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/* This is useless for OF-enabled devices, but it is needed by I2C subsystem */ |
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static const struct i2c_device_id icn8318_i2c_id[] = { |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(i2c, icn8318_i2c_id); |
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static struct i2c_driver icn8318_driver = { |
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.driver = { |
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.name = "chipone_icn8318", |
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.pm = &icn8318_pm_ops, |
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.of_match_table = icn8318_of_match, |
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}, |
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.probe = icn8318_probe, |
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.id_table = icn8318_i2c_id, |
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}; |
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module_i2c_driver(icn8318_driver); |
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MODULE_DESCRIPTION("ChipOne icn8318 I2C Touchscreen Driver"); |
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MODULE_AUTHOR("Hans de Goede <[email protected]>"); |
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MODULE_LICENSE("GPL");
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