drivers/input/misc/cma3000_d0x_i2c.c

Source file repositories/reference/linux-study-clean/drivers/input/misc/cma3000_d0x_i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/input/misc/cma3000_d0x_i2c.c
Extension
.c
Size
2542 bytes
Lines
114
Domain
Driver Families
Bucket
drivers/input
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Implements I2C interface for VTI CMA300_D0x Accelerometer driver
 *
 * Copyright (C) 2010 Texas Instruments
 * Author: Hemanth V <hemanthv@ti.com>
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/input/cma3000.h>
#include "cma3000_d0x.h"

static int cma3000_i2c_set(struct device *dev,
			   u8 reg, u8 val, char *msg)
{
	struct i2c_client *client = to_i2c_client(dev);
	int ret;

	ret = i2c_smbus_write_byte_data(client, reg, val);
	if (ret < 0)
		dev_err(&client->dev,
			"%s failed (%s, %d)\n", __func__, msg, ret);
	return ret;
}

static int cma3000_i2c_read(struct device *dev, u8 reg, char *msg)
{
	struct i2c_client *client = to_i2c_client(dev);
	int ret;

	ret = i2c_smbus_read_byte_data(client, reg);
	if (ret < 0)
		dev_err(&client->dev,
			"%s failed (%s, %d)\n", __func__, msg, ret);
	return ret;
}

static const struct cma3000_bus_ops cma3000_i2c_bops = {
	.bustype	= BUS_I2C,
#define CMA3000_BUSI2C     (0 << 4)
	.ctrl_mod	= CMA3000_BUSI2C,
	.read		= cma3000_i2c_read,
	.write		= cma3000_i2c_set,
};

static int cma3000_i2c_probe(struct i2c_client *client)
{
	struct cma3000_accl_data *data;

	data = cma3000_init(&client->dev, client->irq, &cma3000_i2c_bops);
	if (IS_ERR(data))
		return PTR_ERR(data);

	i2c_set_clientdata(client, data);

	return 0;
}

static void cma3000_i2c_remove(struct i2c_client *client)
{
	struct cma3000_accl_data *data = i2c_get_clientdata(client);

	cma3000_exit(data);
}

static int cma3000_i2c_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct cma3000_accl_data *data = i2c_get_clientdata(client);

	cma3000_suspend(data);

	return 0;
}

static int cma3000_i2c_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct cma3000_accl_data *data = i2c_get_clientdata(client);

	cma3000_resume(data);

	return 0;
}

static const struct dev_pm_ops cma3000_i2c_pm_ops = {
	.suspend	= cma3000_i2c_suspend,
	.resume		= cma3000_i2c_resume,
};

Annotation

Implementation Notes