mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Uwe Kleine-König (The Capable Hub)andDmitry Torokhov
47ceab218c
While being less compact, using named initializers allows to more easily see which members of the structs are assigned which value without having to lookup the declaration of the struct. And it's also more robust against changes to the struct definition. The mentioned robustness is relevant for a planned change to struct i2c_device_id that replaces .driver_data by an anonymous union. This patch doesn't modify the compiled arrays, only their representation in source form benefits. The former was confirmed with x86 and arm64 builds. Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com> Link: https://patch.msgid.link/20260515164848.497608-2-u.kleine-koenig@baylibre.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AD714X CapTouch Programmable Controller driver (I2C bus)
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*
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* Copyright 2009-2011 Analog Devices Inc.
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*/
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#include <linux/input.h> /* BUS_I2C */
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/pm.h>
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#include "ad714x.h"
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static int ad714x_i2c_write(struct ad714x_chip *chip,
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unsigned short reg, unsigned short data)
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{
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struct i2c_client *client = to_i2c_client(chip->dev);
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int error;
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chip->xfer_buf[0] = cpu_to_be16(reg);
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chip->xfer_buf[1] = cpu_to_be16(data);
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error = i2c_master_send(client, (u8 *)chip->xfer_buf,
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2 * sizeof(*chip->xfer_buf));
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if (unlikely(error < 0)) {
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dev_err(&client->dev, "I2C write 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 ad714x_i2c_read(struct ad714x_chip *chip,
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unsigned short reg, unsigned short *data, size_t len)
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{
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struct i2c_client *client = to_i2c_client(chip->dev);
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int i;
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int error;
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chip->xfer_buf[0] = cpu_to_be16(reg);
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error = i2c_master_send(client, (u8 *)chip->xfer_buf,
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sizeof(*chip->xfer_buf));
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if (error >= 0)
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error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
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len * sizeof(*chip->xfer_buf));
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if (unlikely(error < 0)) {
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dev_err(&client->dev, "I2C read error: %d\n", error);
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return error;
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}
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for (i = 0; i < len; i++)
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data[i] = be16_to_cpu(chip->xfer_buf[i]);
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return 0;
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}
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static int ad714x_i2c_probe(struct i2c_client *client)
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{
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struct ad714x_chip *chip;
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chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
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ad714x_i2c_read, ad714x_i2c_write);
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if (IS_ERR(chip))
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return PTR_ERR(chip);
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i2c_set_clientdata(client, chip);
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return 0;
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}
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static const struct i2c_device_id ad714x_id[] = {
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{ .name = "ad7142_captouch" },
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{ .name = "ad7143_captouch" },
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{ .name = "ad7147_captouch" },
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{ .name = "ad7147a_captouch" },
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{ .name = "ad7148_captouch" },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ad714x_id);
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static struct i2c_driver ad714x_i2c_driver = {
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.driver = {
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.name = "ad714x_captouch",
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.pm = pm_sleep_ptr(&ad714x_pm),
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},
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.probe = ad714x_i2c_probe,
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.id_table = ad714x_id,
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};
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module_i2c_driver(ad714x_i2c_driver);
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MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_LICENSE("GPL");
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