[deliverable/linux.git] / drivers / misc / ad525x_dpot-spi.c

/*
 * Driver for the Analog Devices digital potentiometers (SPI bus)
 *
 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/spi/spi.h>
#include <linux/module.h>

#include "ad525x_dpot.h"

/* SPI bus functions */
static int write8(void *client, u8 val)
{
	u8 data = val;
	return spi_write(client, &data, 1);
}

static int write16(void *client, u8 reg, u8 val)
{
	u8 data[2] = {reg, val};
	return spi_write(client, data, 2);
}

static int write24(void *client, u8 reg, u16 val)
{
	u8 data[3] = {reg, val >> 8, val};
	return spi_write(client, data, 3);
}

static int read8(void *client)
{
	int ret;
	u8 data;
	ret = spi_read(client, &data, 1);
	if (ret < 0)
		return ret;

	return data;
}

static int read16(void *client, u8 reg)
{
	int ret;
	u8 buf_rx[2];

	write16(client, reg, 0);
	ret = spi_read(client, buf_rx, 2);
	if (ret < 0)
		return ret;

	return (buf_rx[0] << 8) |  buf_rx[1];
}

static int read24(void *client, u8 reg)
{
	int ret;
	u8 buf_rx[3];

	write24(client, reg, 0);
	ret = spi_read(client, buf_rx, 3);
	if (ret < 0)
		return ret;

	return (buf_rx[1] << 8) |  buf_rx[2];
}

static const struct ad_dpot_bus_ops bops = {
	.read_d8	= read8,
	.read_r8d8	= read16,
	.read_r8d16	= read24,
	.write_d8	= write8,
	.write_r8d8	= write16,
	.write_r8d16	= write24,
};
static int ad_dpot_spi_probe(struct spi_device *spi)
{
	struct ad_dpot_bus_data bdata = {
		.client = spi,
		.bops = &bops,
	};

	return ad_dpot_probe(&spi->dev, &bdata,
			     spi_get_device_id(spi)->driver_data,
			     spi_get_device_id(spi)->name);
}

static int ad_dpot_spi_remove(struct spi_device *spi)
{
	return ad_dpot_remove(&spi->dev);
}

static const struct spi_device_id ad_dpot_spi_id[] = {
	{"ad5160", AD5160_ID},
	{"ad5161", AD5161_ID},
	{"ad5162", AD5162_ID},
	{"ad5165", AD5165_ID},
	{"ad5200", AD5200_ID},
	{"ad5201", AD5201_ID},
	{"ad5203", AD5203_ID},
	{"ad5204", AD5204_ID},
	{"ad5206", AD5206_ID},
	{"ad5207", AD5207_ID},
	{"ad5231", AD5231_ID},
	{"ad5232", AD5232_ID},
	{"ad5233", AD5233_ID},
	{"ad5235", AD5235_ID},
	{"ad5260", AD5260_ID},
	{"ad5262", AD5262_ID},
	{"ad5263", AD5263_ID},
	{"ad5290", AD5290_ID},
	{"ad5291", AD5291_ID},
	{"ad5292", AD5292_ID},
	{"ad5293", AD5293_ID},
	{"ad7376", AD7376_ID},
	{"ad8400", AD8400_ID},
	{"ad8402", AD8402_ID},
	{"ad8403", AD8403_ID},
	{"adn2850", ADN2850_ID},
	{"ad5270", AD5270_ID},
	{"ad5271", AD5271_ID},
	{}
};
MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);

static struct spi_driver ad_dpot_spi_driver = {
	.driver = {
		.name	= "ad_dpot",
		.owner	= THIS_MODULE,
	},
	.probe		= ad_dpot_spi_probe,
	.remove		= ad_dpot_spi_remove,
	.id_table	= ad_dpot_spi_id,
};

module_spi_driver(ad_dpot_spi_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("spi:ad_dpot");
Commit	Line	Data
6c536e4c MH	1	/*
	2	* Driver for the Analog Devices digital potentiometers (SPI bus)
	3	*
7f3379de	4	* Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
6c536e4c MH	5	*
	6	* Licensed under the GPL-2 or later.
	7	*/
	8
	9	#include <linux/spi/spi.h>
	10	#include <linux/module.h>
	11
	12	#include "ad525x_dpot.h"
	13
6c536e4c MH	14	/* SPI bus functions */
	15	static int write8(void *client, u8 val)
	16	{
	17	u8 data = val;
	18	return spi_write(client, &data, 1);
	19	}
	20
	21	static int write16(void *client, u8 reg, u8 val)
	22	{
	23	u8 data[2] = {reg, val};
1f9fa521	24	return spi_write(client, data, 2);
6c536e4c MH	25	}
	26
	27	static int write24(void *client, u8 reg, u16 val)
	28	{
	29	u8 data[3] = {reg, val >> 8, val};
1f9fa521	30	return spi_write(client, data, 3);
6c536e4c MH	31	}
	32
	33	static int read8(void *client)
	34	{
	35	int ret;
	36	u8 data;
	37	ret = spi_read(client, &data, 1);
	38	if (ret < 0)
	39	return ret;
	40
	41	return data;
	42	}
	43
	44	static int read16(void *client, u8 reg)
	45	{
	46	int ret;
	47	u8 buf_rx[2];
	48
	49	write16(client, reg, 0);
	50	ret = spi_read(client, buf_rx, 2);
	51	if (ret < 0)
	52	return ret;
	53
	54	return (buf_rx[0] << 8) \| buf_rx[1];
	55	}
	56
	57	static int read24(void *client, u8 reg)
	58	{
	59	int ret;
	60	u8 buf_rx[3];
	61
	62	write24(client, reg, 0);
	63	ret = spi_read(client, buf_rx, 3);
	64	if (ret < 0)
	65	return ret;
	66
	67	return (buf_rx[1] << 8) \| buf_rx[2];
	68	}
	69
	70	static const struct ad_dpot_bus_ops bops = {
	71	.read_d8 = read8,
	72	.read_r8d8 = read16,
	73	.read_r8d16 = read24,
	74	.write_d8 = write8,
	75	.write_r8d8 = write16,
	76	.write_r8d16 = write24,
	77	};
80c8ae28	78	static int ad_dpot_spi_probe(struct spi_device *spi)
6c536e4c	79	{
6c536e4c MH	80	struct ad_dpot_bus_data bdata = {
	81	.client = spi,
	82	.bops = &bops,
	83	};
	84
7f3379de MH	85	return ad_dpot_probe(&spi->dev, &bdata,
	86	spi_get_device_id(spi)->driver_data,
	87	spi_get_device_id(spi)->name);
6c536e4c MH	88	}
6c536e4c MH	89
486a5c28	90	static int ad_dpot_spi_remove(struct spi_device *spi)
6c536e4c MH	91	{
	92	return ad_dpot_remove(&spi->dev);
	93	}
	94
7f3379de MH	95	static const struct spi_device_id ad_dpot_spi_id[] = {
	96	{"ad5160", AD5160_ID},
	97	{"ad5161", AD5161_ID},
	98	{"ad5162", AD5162_ID},
	99	{"ad5165", AD5165_ID},
	100	{"ad5200", AD5200_ID},
	101	{"ad5201", AD5201_ID},
	102	{"ad5203", AD5203_ID},
	103	{"ad5204", AD5204_ID},
	104	{"ad5206", AD5206_ID},
	105	{"ad5207", AD5207_ID},
	106	{"ad5231", AD5231_ID},
	107	{"ad5232", AD5232_ID},
	108	{"ad5233", AD5233_ID},
	109	{"ad5235", AD5235_ID},
	110	{"ad5260", AD5260_ID},
	111	{"ad5262", AD5262_ID},
	112	{"ad5263", AD5263_ID},
	113	{"ad5290", AD5290_ID},
	114	{"ad5291", AD5291_ID},
	115	{"ad5292", AD5292_ID},
	116	{"ad5293", AD5293_ID},
	117	{"ad7376", AD7376_ID},
	118	{"ad8400", AD8400_ID},
	119	{"ad8402", AD8402_ID},
	120	{"ad8403", AD8403_ID},
	121	{"adn2850", ADN2850_ID},
	122	{"ad5270", AD5270_ID},
	123	{"ad5271", AD5271_ID},
	124	{}
	125	};
	126	MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
	127
6c536e4c MH	128	static struct spi_driver ad_dpot_spi_driver = {
	129	.driver = {
	130	.name = "ad_dpot",
6c536e4c MH	131	.owner = THIS_MODULE,
	132	},
	133	.probe = ad_dpot_spi_probe,
2d6bed9c	134	.remove = ad_dpot_spi_remove,
7f3379de	135	.id_table = ad_dpot_spi_id,
6c536e4c MH	136	};
6c536e4c MH	137
a3dc3c9e	138	module_spi_driver(ad_dpot_spi_driver);
6c536e4c MH	139
	140	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	141	MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
	142	MODULE_LICENSE("GPL");
	143	MODULE_ALIAS("spi:ad_dpot");