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195 lines
4.4 KiB
195 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Microchip AR1020 and AR1021 driver for I2C |
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* |
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* Author: Christian Gmeiner <[email protected]> |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/module.h> |
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#include <linux/input.h> |
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#include <linux/of.h> |
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#include <linux/i2c.h> |
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#include <linux/irq.h> |
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#include <linux/interrupt.h> |
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#define AR1021_TOUCH_PKG_SIZE 5 |
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#define AR1021_MAX_X 4095 |
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#define AR1021_MAX_Y 4095 |
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#define AR1021_CMD 0x55 |
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#define AR1021_CMD_ENABLE_TOUCH 0x12 |
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struct ar1021_i2c { |
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struct i2c_client *client; |
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struct input_dev *input; |
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u8 data[AR1021_TOUCH_PKG_SIZE]; |
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}; |
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static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id) |
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{ |
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struct ar1021_i2c *ar1021 = dev_id; |
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struct input_dev *input = ar1021->input; |
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u8 *data = ar1021->data; |
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unsigned int x, y, button; |
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int retval; |
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retval = i2c_master_recv(ar1021->client, |
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ar1021->data, sizeof(ar1021->data)); |
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if (retval != sizeof(ar1021->data)) |
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goto out; |
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/* sync bit set ? */ |
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if (!(data[0] & BIT(7))) |
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goto out; |
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button = data[0] & BIT(0); |
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x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f); |
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y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f); |
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input_report_abs(input, ABS_X, x); |
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input_report_abs(input, ABS_Y, y); |
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input_report_key(input, BTN_TOUCH, button); |
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input_sync(input); |
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out: |
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return IRQ_HANDLED; |
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} |
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static int ar1021_i2c_open(struct input_dev *dev) |
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{ |
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static const u8 cmd_enable_touch[] = { |
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AR1021_CMD, |
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0x01, /* number of bytes after this */ |
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AR1021_CMD_ENABLE_TOUCH |
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}; |
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struct ar1021_i2c *ar1021 = input_get_drvdata(dev); |
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struct i2c_client *client = ar1021->client; |
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int error; |
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error = i2c_master_send(ar1021->client, cmd_enable_touch, |
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sizeof(cmd_enable_touch)); |
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if (error < 0) |
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return error; |
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enable_irq(client->irq); |
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return 0; |
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} |
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static void ar1021_i2c_close(struct input_dev *dev) |
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{ |
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struct ar1021_i2c *ar1021 = input_get_drvdata(dev); |
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struct i2c_client *client = ar1021->client; |
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disable_irq(client->irq); |
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} |
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static int ar1021_i2c_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct ar1021_i2c *ar1021; |
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struct input_dev *input; |
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int error; |
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
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dev_err(&client->dev, "i2c_check_functionality error\n"); |
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return -ENXIO; |
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} |
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ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL); |
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if (!ar1021) |
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return -ENOMEM; |
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input = devm_input_allocate_device(&client->dev); |
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if (!input) |
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return -ENOMEM; |
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ar1021->client = client; |
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ar1021->input = input; |
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input->name = "ar1021 I2C Touchscreen"; |
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input->id.bustype = BUS_I2C; |
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input->dev.parent = &client->dev; |
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input->open = ar1021_i2c_open; |
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input->close = ar1021_i2c_close; |
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__set_bit(INPUT_PROP_DIRECT, input->propbit); |
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input_set_capability(input, EV_KEY, BTN_TOUCH); |
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input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0); |
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input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0); |
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input_set_drvdata(input, ar1021); |
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error = devm_request_threaded_irq(&client->dev, client->irq, |
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NULL, ar1021_i2c_irq, |
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IRQF_ONESHOT, |
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"ar1021_i2c", ar1021); |
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if (error) { |
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dev_err(&client->dev, |
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"Failed to enable IRQ, error: %d\n", error); |
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return error; |
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} |
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/* Disable the IRQ, we'll enable it in ar1021_i2c_open() */ |
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disable_irq(client->irq); |
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error = input_register_device(ar1021->input); |
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if (error) { |
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dev_err(&client->dev, |
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"Failed to register input device, error: %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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static int __maybe_unused ar1021_i2c_suspend(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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disable_irq(client->irq); |
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return 0; |
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} |
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static int __maybe_unused ar1021_i2c_resume(struct device *dev) |
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{ |
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struct i2c_client *client = to_i2c_client(dev); |
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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(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume); |
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static const struct i2c_device_id ar1021_i2c_id[] = { |
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{ "ar1021", 0 }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id); |
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static const struct of_device_id ar1021_i2c_of_match[] = { |
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{ .compatible = "microchip,ar1021-i2c", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match); |
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static struct i2c_driver ar1021_i2c_driver = { |
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.driver = { |
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.name = "ar1021_i2c", |
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.pm = &ar1021_i2c_pm, |
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.of_match_table = ar1021_i2c_of_match, |
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}, |
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.probe = ar1021_i2c_probe, |
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.id_table = ar1021_i2c_id, |
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}; |
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module_i2c_driver(ar1021_i2c_driver); |
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MODULE_AUTHOR("Christian Gmeiner <[email protected]>"); |
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MODULE_DESCRIPTION("Microchip AR1020 and AR1021 I2C Driver"); |
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MODULE_LICENSE("GPL");
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