[deliverable/linux.git] / drivers / input / misc / adxl34x-spi.c

/*
 * ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface)
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#include <linux/input.h>	/* BUS_SPI */
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/pm.h>
#include <linux/types.h>
#include "adxl34x.h"

#define MAX_SPI_FREQ_HZ		5000000
#define MAX_FREQ_NO_FIFODELAY	1500000
#define ADXL34X_CMD_MULTB	(1 << 6)
#define ADXL34X_CMD_READ	(1 << 7)
#define ADXL34X_WRITECMD(reg)	(reg & 0x3F)
#define ADXL34X_READCMD(reg)	(ADXL34X_CMD_READ | (reg & 0x3F))
#define ADXL34X_READMB_CMD(reg) (ADXL34X_CMD_READ | ADXL34X_CMD_MULTB \
					| (reg & 0x3F))

static int adxl34x_spi_read(struct device *dev, unsigned char reg)
{
	struct spi_device *spi = to_spi_device(dev);
	unsigned char cmd;

	cmd = ADXL34X_READCMD(reg);

	return spi_w8r8(spi, cmd);
}

static int adxl34x_spi_write(struct device *dev,
			     unsigned char reg, unsigned char val)
{
	struct spi_device *spi = to_spi_device(dev);
	unsigned char buf[2];

	buf[0] = ADXL34X_WRITECMD(reg);
	buf[1] = val;

	return spi_write(spi, buf, sizeof(buf));
}

static int adxl34x_spi_read_block(struct device *dev,
				  unsigned char reg, int count,
				  void *buf)
{
	struct spi_device *spi = to_spi_device(dev);
	ssize_t status;

	reg = ADXL34X_READMB_CMD(reg);
	status = spi_write_then_read(spi, &reg, 1, buf, count);

	return (status < 0) ? status : 0;
}

static const struct adxl34x_bus_ops adxl34x_spi_bops = {
	.bustype	= BUS_SPI,
	.write		= adxl34x_spi_write,
	.read		= adxl34x_spi_read,
	.read_block	= adxl34x_spi_read_block,
};

static int __devinit adxl34x_spi_probe(struct spi_device *spi)
{
	struct adxl34x *ac;

	/* don't exceed max specified SPI CLK frequency */
	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
		dev_err(&spi->dev, "SPI CLK %d Hz too fast\n", spi->max_speed_hz);
		return -EINVAL;
	}

	ac = adxl34x_probe(&spi->dev, spi->irq,
			   spi->max_speed_hz > MAX_FREQ_NO_FIFODELAY,
			   &adxl34x_spi_bops);

	if (IS_ERR(ac))
		return PTR_ERR(ac);

	spi_set_drvdata(spi, ac);

	return 0;
}

static int __devexit adxl34x_spi_remove(struct spi_device *spi)
{
	struct adxl34x *ac = dev_get_drvdata(&spi->dev);

	return adxl34x_remove(ac);
}

#ifdef CONFIG_PM
static int adxl34x_spi_suspend(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct adxl34x *ac = dev_get_drvdata(&spi->dev);

	adxl34x_suspend(ac);

	return 0;
}

static int adxl34x_spi_resume(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct adxl34x *ac = dev_get_drvdata(&spi->dev);

	adxl34x_resume(ac);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(adxl34x_spi_pm, adxl34x_spi_suspend,
			 adxl34x_spi_resume);

static struct spi_driver adxl34x_driver = {
	.driver = {
		.name = "adxl34x",
		.bus = &spi_bus_type,
		.owner = THIS_MODULE,
		.pm = &adxl34x_spi_pm,
	},
	.probe   = adxl34x_spi_probe,
	.remove  = __devexit_p(adxl34x_spi_remove),
};

static int __init adxl34x_spi_init(void)
{
	return spi_register_driver(&adxl34x_driver);
}
module_init(adxl34x_spi_init);

static void __exit adxl34x_spi_exit(void)
{
	spi_unregister_driver(&adxl34x_driver);
}
module_exit(adxl34x_spi_exit);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
e27c7292 MH	1	/*
	2	* ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface)
	3	*
	4	* Enter bugs at http://blackfin.uclinux.org/
	5	*
	6	* Copyright (C) 2009 Michael Hennerich, Analog Devices Inc.
	7	* Licensed under the GPL-2 or later.
	8	*/
	9
	10	#include <linux/input.h> /* BUS_SPI */
	11	#include <linux/module.h>
	12	#include <linux/spi/spi.h>
4d1ac94e	13	#include <linux/pm.h>
e27c7292 MH	14	#include <linux/types.h>
	15	#include "adxl34x.h"
	16
	17	#define MAX_SPI_FREQ_HZ 5000000
	18	#define MAX_FREQ_NO_FIFODELAY 1500000
	19	#define ADXL34X_CMD_MULTB (1 << 6)
	20	#define ADXL34X_CMD_READ (1 << 7)
	21	#define ADXL34X_WRITECMD(reg) (reg & 0x3F)
	22	#define ADXL34X_READCMD(reg) (ADXL34X_CMD_READ \| (reg & 0x3F))
	23	#define ADXL34X_READMB_CMD(reg) (ADXL34X_CMD_READ \| ADXL34X_CMD_MULTB \
	24	\| (reg & 0x3F))
	25
	26	static int adxl34x_spi_read(struct device *dev, unsigned char reg)
	27	{
	28	struct spi_device *spi = to_spi_device(dev);
	29	unsigned char cmd;
	30
	31	cmd = ADXL34X_READCMD(reg);
	32
	33	return spi_w8r8(spi, cmd);
	34	}
	35
	36	static int adxl34x_spi_write(struct device *dev,
	37	unsigned char reg, unsigned char val)
	38	{
	39	struct spi_device *spi = to_spi_device(dev);
	40	unsigned char buf[2];
	41
	42	buf[0] = ADXL34X_WRITECMD(reg);
	43	buf[1] = val;
	44
	45	return spi_write(spi, buf, sizeof(buf));
	46	}
	47
	48	static int adxl34x_spi_read_block(struct device *dev,
	49	unsigned char reg, int count,
	50	void *buf)
	51	{
	52	struct spi_device *spi = to_spi_device(dev);
	53	ssize_t status;
	54
	55	reg = ADXL34X_READMB_CMD(reg);
	56	status = spi_write_then_read(spi, &reg, 1, buf, count);
	57
	58	return (status < 0) ? status : 0;
	59	}
	60
3dcab3bd	61	static const struct adxl34x_bus_ops adxl34x_spi_bops = {
e27c7292 MH	62	.bustype = BUS_SPI,
	63	.write = adxl34x_spi_write,
	64	.read = adxl34x_spi_read,
	65	.read_block = adxl34x_spi_read_block,
	66	};
	67
	68	static int __devinit adxl34x_spi_probe(struct spi_device *spi)
	69	{
	70	struct adxl34x *ac;
	71
	72	/* don't exceed max specified SPI CLK frequency */
	73	if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) {
	74	dev_err(&spi->dev, "SPI CLK %d Hz too fast\n", spi->max_speed_hz);
	75	return -EINVAL;
	76	}
	77
	78	ac = adxl34x_probe(&spi->dev, spi->irq,
	79	spi->max_speed_hz > MAX_FREQ_NO_FIFODELAY,
3dcab3bd	80	&adxl34x_spi_bops);
e27c7292 MH	81
	82	if (IS_ERR(ac))
	83	return PTR_ERR(ac);
	84
	85	spi_set_drvdata(spi, ac);
	86
	87	return 0;
	88	}
	89
	90	static int __devexit adxl34x_spi_remove(struct spi_device *spi)
	91	{
	92	struct adxl34x *ac = dev_get_drvdata(&spi->dev);
	93
	94	return adxl34x_remove(ac);
	95	}
	96
	97	#ifdef CONFIG_PM
4d1ac94e	98	static int adxl34x_spi_suspend(struct device *dev)
e27c7292	99	{
4d1ac94e	100	struct spi_device *spi = to_spi_device(dev);
e27c7292 MH	101	struct adxl34x *ac = dev_get_drvdata(&spi->dev);
e27c7292 MH	102
af6e1d99	103	adxl34x_suspend(ac);
e27c7292 MH	104
	105	return 0;
	106	}
	107
4d1ac94e	108	static int adxl34x_spi_resume(struct device *dev)
e27c7292	109	{
4d1ac94e	110	struct spi_device *spi = to_spi_device(dev);
e27c7292 MH	111	struct adxl34x *ac = dev_get_drvdata(&spi->dev);
e27c7292 MH	112
af6e1d99	113	adxl34x_resume(ac);
e27c7292 MH	114
	115	return 0;
	116	}
e27c7292 MH	117	#endif
e27c7292 MH	118
4d1ac94e MB	119	static SIMPLE_DEV_PM_OPS(adxl34x_spi_pm, adxl34x_spi_suspend,
	120	adxl34x_spi_resume);
	121
e27c7292 MH	122	static struct spi_driver adxl34x_driver = {
	123	.driver = {
	124	.name = "adxl34x",
	125	.bus = &spi_bus_type,
	126	.owner = THIS_MODULE,
4d1ac94e	127	.pm = &adxl34x_spi_pm,
e27c7292 MH	128	},
	129	.probe = adxl34x_spi_probe,
	130	.remove = __devexit_p(adxl34x_spi_remove),
e27c7292 MH	131	};
	132
	133	static int __init adxl34x_spi_init(void)
	134	{
	135	return spi_register_driver(&adxl34x_driver);
	136	}
	137	module_init(adxl34x_spi_init);
	138
	139	static void __exit adxl34x_spi_exit(void)
	140	{
	141	spi_unregister_driver(&adxl34x_driver);
	142	}
	143	module_exit(adxl34x_spi_exit);
	144
	145	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	146	MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver");
	147	MODULE_LICENSE("GPL");