diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/misc/ad714x-i2c.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/misc/ad714x-i2c.c')
-rw-r--r-- | drivers/input/misc/ad714x-i2c.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/input/misc/ad714x-i2c.c b/drivers/input/misc/ad714x-i2c.c new file mode 100644 index 000000000..efeef1350 --- /dev/null +++ b/drivers/input/misc/ad714x-i2c.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * AD714X CapTouch Programmable Controller driver (I2C bus) + * + * Copyright 2009-2011 Analog Devices Inc. + */ + +#include <linux/input.h> /* BUS_I2C */ +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/pm.h> +#include "ad714x.h" + +static int __maybe_unused ad714x_i2c_suspend(struct device *dev) +{ + return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev))); +} + +static int __maybe_unused ad714x_i2c_resume(struct device *dev) +{ + return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev))); +} + +static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume); + +static int ad714x_i2c_write(struct ad714x_chip *chip, + unsigned short reg, unsigned short data) +{ + struct i2c_client *client = to_i2c_client(chip->dev); + int error; + + chip->xfer_buf[0] = cpu_to_be16(reg); + chip->xfer_buf[1] = cpu_to_be16(data); + + error = i2c_master_send(client, (u8 *)chip->xfer_buf, + 2 * sizeof(*chip->xfer_buf)); + if (unlikely(error < 0)) { + dev_err(&client->dev, "I2C write error: %d\n", error); + return error; + } + + return 0; +} + +static int ad714x_i2c_read(struct ad714x_chip *chip, + unsigned short reg, unsigned short *data, size_t len) +{ + struct i2c_client *client = to_i2c_client(chip->dev); + int i; + int error; + + chip->xfer_buf[0] = cpu_to_be16(reg); + + error = i2c_master_send(client, (u8 *)chip->xfer_buf, + sizeof(*chip->xfer_buf)); + if (error >= 0) + error = i2c_master_recv(client, (u8 *)chip->xfer_buf, + len * sizeof(*chip->xfer_buf)); + + if (unlikely(error < 0)) { + dev_err(&client->dev, "I2C read error: %d\n", error); + return error; + } + + for (i = 0; i < len; i++) + data[i] = be16_to_cpu(chip->xfer_buf[i]); + + return 0; +} + +static int ad714x_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ad714x_chip *chip; + + chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, + ad714x_i2c_read, ad714x_i2c_write); + if (IS_ERR(chip)) + return PTR_ERR(chip); + + i2c_set_clientdata(client, chip); + + return 0; +} + +static const struct i2c_device_id ad714x_id[] = { + { "ad7142_captouch", 0 }, + { "ad7143_captouch", 0 }, + { "ad7147_captouch", 0 }, + { "ad7147a_captouch", 0 }, + { "ad7148_captouch", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ad714x_id); + +static struct i2c_driver ad714x_i2c_driver = { + .driver = { + .name = "ad714x_captouch", + .pm = &ad714x_i2c_pm, + }, + .probe = ad714x_i2c_probe, + .id_table = ad714x_id, +}; + +module_i2c_driver(ad714x_i2c_driver); + +MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); +MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); +MODULE_LICENSE("GPL"); |