blob: 820a802a1e6e19c51934efc9b1dbc18eb6e00f4b [file] [log] [blame]
Michael Henneriche27c7292010-06-25 08:44:10 -07001/*
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>
Mark Brown4d1ac942011-02-11 09:22:40 -080013#include <linux/pm.h>
Michael Henneriche27c7292010-06-25 08:44:10 -070014#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
26static 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
36static 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
48static 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
Mark Brown3dcab3b2011-02-11 08:53:04 -080061static const struct adxl34x_bus_ops adxl34x_spi_bops = {
Michael Henneriche27c7292010-06-25 08:44:10 -070062 .bustype = BUS_SPI,
63 .write = adxl34x_spi_write,
64 .read = adxl34x_spi_read,
65 .read_block = adxl34x_spi_read_block,
66};
67
68static 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,
Mark Brown3dcab3b2011-02-11 08:53:04 -080080 &adxl34x_spi_bops);
Michael Henneriche27c7292010-06-25 08:44:10 -070081
82 if (IS_ERR(ac))
83 return PTR_ERR(ac);
84
85 spi_set_drvdata(spi, ac);
86
87 return 0;
88}
89
90static 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
Mark Brown4d1ac942011-02-11 09:22:40 -080098static int adxl34x_spi_suspend(struct device *dev)
Michael Henneriche27c7292010-06-25 08:44:10 -070099{
Mark Brown4d1ac942011-02-11 09:22:40 -0800100 struct spi_device *spi = to_spi_device(dev);
Michael Henneriche27c7292010-06-25 08:44:10 -0700101 struct adxl34x *ac = dev_get_drvdata(&spi->dev);
102
Dmitry Torokhovaf6e1d92010-07-01 09:07:33 -0700103 adxl34x_suspend(ac);
Michael Henneriche27c7292010-06-25 08:44:10 -0700104
105 return 0;
106}
107
Mark Brown4d1ac942011-02-11 09:22:40 -0800108static int adxl34x_spi_resume(struct device *dev)
Michael Henneriche27c7292010-06-25 08:44:10 -0700109{
Mark Brown4d1ac942011-02-11 09:22:40 -0800110 struct spi_device *spi = to_spi_device(dev);
Michael Henneriche27c7292010-06-25 08:44:10 -0700111 struct adxl34x *ac = dev_get_drvdata(&spi->dev);
112
Dmitry Torokhovaf6e1d92010-07-01 09:07:33 -0700113 adxl34x_resume(ac);
Michael Henneriche27c7292010-06-25 08:44:10 -0700114
115 return 0;
116}
Michael Henneriche27c7292010-06-25 08:44:10 -0700117#endif
118
Mark Brown4d1ac942011-02-11 09:22:40 -0800119static SIMPLE_DEV_PM_OPS(adxl34x_spi_pm, adxl34x_spi_suspend,
120 adxl34x_spi_resume);
121
Michael Henneriche27c7292010-06-25 08:44:10 -0700122static struct spi_driver adxl34x_driver = {
123 .driver = {
124 .name = "adxl34x",
Michael Henneriche27c7292010-06-25 08:44:10 -0700125 .owner = THIS_MODULE,
Mark Brown4d1ac942011-02-11 09:22:40 -0800126 .pm = &adxl34x_spi_pm,
Michael Henneriche27c7292010-06-25 08:44:10 -0700127 },
128 .probe = adxl34x_spi_probe,
129 .remove = __devexit_p(adxl34x_spi_remove),
Michael Henneriche27c7292010-06-25 08:44:10 -0700130};
131
Axel Linca839222012-03-16 23:05:26 -0700132module_spi_driver(adxl34x_driver);
Michael Henneriche27c7292010-06-25 08:44:10 -0700133
134MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
135MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver");
136MODULE_LICENSE("GPL");