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Release 4.11 drivers/input/touchscreen/ar1021_i2c.c

/*
 * Microchip AR1021 driver for I2C
 *
 * Author: Christian Gmeiner <christian.gmeiner@gmail.com>
 *
 * License: GPLv2 as published by the FSF.
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/of.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/interrupt.h>


#define AR1021_TOCUH_PKG_SIZE	5


#define AR1021_MAX_X	4095

#define AR1021_MAX_Y	4095


struct ar1021_i2c {
	
struct i2c_client *client;
	
struct input_dev *input;
	
u8 data[AR1021_TOCUH_PKG_SIZE];
};


static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id) { struct ar1021_i2c *ar1021 = dev_id; struct input_dev *input = ar1021->input; u8 *data = ar1021->data; unsigned int x, y, button; int retval; retval = i2c_master_recv(ar1021->client, ar1021->data, sizeof(ar1021->data)); if (retval != sizeof(ar1021->data)) goto out; /* sync bit set ? */ if ((data[0] & 0x80) == 0) goto out; button = data[0] & BIT(0); x = ((data[2] & 0x1f) << 7) | (data[1] & 0x7f); y = ((data[4] & 0x1f) << 7) | (data[3] & 0x7f); input_report_abs(input, ABS_X, x); input_report_abs(input, ABS_Y, y); input_report_key(input, BTN_TOUCH, button); input_sync(input); out: return IRQ_HANDLED; }

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Christian Gmeiner196100.00%1100.00%
Total196100.00%1100.00%


static int ar1021_i2c_open(struct input_dev *dev) { struct ar1021_i2c *ar1021 = input_get_drvdata(dev); struct i2c_client *client = ar1021->client; enable_irq(client->irq); return 0; }

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Christian Gmeiner40100.00%1100.00%
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static void ar1021_i2c_close(struct input_dev *dev) { struct ar1021_i2c *ar1021 = input_get_drvdata(dev); struct i2c_client *client = ar1021->client; disable_irq(client->irq); }

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Christian Gmeiner37100.00%1100.00%
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static int ar1021_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct ar1021_i2c *ar1021; struct input_dev *input; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "i2c_check_functionality error\n"); return -ENXIO; } ar1021 = devm_kzalloc(&client->dev, sizeof(*ar1021), GFP_KERNEL); if (!ar1021) return -ENOMEM; input = devm_input_allocate_device(&client->dev); if (!input) return -ENOMEM; ar1021->client = client; ar1021->input = input; input->name = "ar1021 I2C Touchscreen"; input->id.bustype = BUS_I2C; input->dev.parent = &client->dev; input->open = ar1021_i2c_open; input->close = ar1021_i2c_close; input_set_capability(input, EV_KEY, BTN_TOUCH); input_set_abs_params(input, ABS_X, 0, AR1021_MAX_X, 0, 0); input_set_abs_params(input, ABS_Y, 0, AR1021_MAX_Y, 0, 0); input_set_drvdata(input, ar1021); error = devm_request_threaded_irq(&client->dev, client->irq, NULL, ar1021_i2c_irq, IRQF_TRIGGER_RISING | IRQF_ONESHOT, "ar1021_i2c", ar1021); if (error) { dev_err(&client->dev, "Failed to enable IRQ, error: %d\n", error); return error; } /* Disable the IRQ, we'll enable it in ar1021_i2c_open() */ disable_irq(client->irq); error = input_register_device(ar1021->input); if (error) { dev_err(&client->dev, "Failed to register input device, error: %d\n", error); return error; } return 0; }

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Christian Gmeiner287100.00%1100.00%
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static int __maybe_unused ar1021_i2c_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); disable_irq(client->irq); return 0; }

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Christian Gmeiner32100.00%1100.00%
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static int __maybe_unused ar1021_i2c_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); enable_irq(client->irq); return 0; }

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Christian Gmeiner32100.00%1100.00%
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static SIMPLE_DEV_PM_OPS(ar1021_i2c_pm, ar1021_i2c_suspend, ar1021_i2c_resume); static const struct i2c_device_id ar1021_i2c_id[] = { { "MICROCHIP_AR1021_I2C", 0 }, { }, }; MODULE_DEVICE_TABLE(i2c, ar1021_i2c_id); static const struct of_device_id ar1021_i2c_of_match[] = { { .compatible = "microchip,ar1021-i2c", }, { } }; MODULE_DEVICE_TABLE(of, ar1021_i2c_of_match); static struct i2c_driver ar1021_i2c_driver = { .driver = { .name = "ar1021_i2c", .pm = &ar1021_i2c_pm, .of_match_table = ar1021_i2c_of_match, }, .probe = ar1021_i2c_probe, .id_table = ar1021_i2c_id, }; module_i2c_driver(ar1021_i2c_driver); MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>"); MODULE_DESCRIPTION("Microchip AR1021 I2C Driver"); MODULE_LICENSE("GPL");

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Christian Gmeiner79299.87%150.00%
Fabian Frederick10.13%150.00%
Total793100.00%2100.00%
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