2 * ADIS16060 Wide Bandwidth Yaw Rate Gyroscope with SPI driver
4 * Copyright 2010 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/module.h>
10 #include <linux/delay.h>
11 #include <linux/mutex.h>
12 #include <linux/device.h>
13 #include <linux/kernel.h>
14 #include <linux/spi/spi.h>
15 #include <linux/slab.h>
16 #include <linux/sysfs.h>
18 #include <linux/iio/iio.h>
19 #include <linux/iio/sysfs.h>
21 #define ADIS16060_GYRO 0x20 /* Measure Angular Rate (Gyro) */
22 #define ADIS16060_TEMP_OUT 0x10 /* Measure Temperature */
23 #define ADIS16060_AIN2 0x80 /* Measure AIN2 */
24 #define ADIS16060_AIN1 0x40 /* Measure AIN1 */
27 * struct adis16060_state - device instance specific data
28 * @us_w: actual spi_device to write config
29 * @us_r: actual spi_device to read back data
30 * @buf: transmit or receive buffer
31 * @buf_lock: mutex to protect tx and rx
33 struct adis16060_state
{
34 struct spi_device
*us_w
;
35 struct spi_device
*us_r
;
36 struct mutex buf_lock
;
38 u8 buf
[3] ____cacheline_aligned
;
41 static struct iio_dev
*adis16060_iio_dev
;
43 static int adis16060_spi_write(struct iio_dev
*indio_dev
, u8 val
)
46 struct adis16060_state
*st
= iio_priv(indio_dev
);
48 mutex_lock(&st
->buf_lock
);
49 st
->buf
[2] = val
; /* The last 8 bits clocked in are latched */
50 ret
= spi_write(st
->us_w
, st
->buf
, 3);
51 mutex_unlock(&st
->buf_lock
);
56 static int adis16060_spi_read(struct iio_dev
*indio_dev
, u16
*val
)
59 struct adis16060_state
*st
= iio_priv(indio_dev
);
61 mutex_lock(&st
->buf_lock
);
63 ret
= spi_read(st
->us_r
, st
->buf
, 3);
65 /* The internal successive approximation ADC begins the
66 * conversion process on the falling edge of MSEL1 and
67 * starts to place data MSB first on the DOUT line at
68 * the 6th falling edge of SCLK
71 *val
= ((st
->buf
[0] & 0x3) << 12) |
73 ((st
->buf
[2] >> 4) & 0xF);
74 mutex_unlock(&st
->buf_lock
);
79 static int adis16060_read_raw(struct iio_dev
*indio_dev
,
80 struct iio_chan_spec
const *chan
,
88 case IIO_CHAN_INFO_RAW
:
89 /* Take the iio_dev status lock */
90 mutex_lock(&indio_dev
->mlock
);
91 ret
= adis16060_spi_write(indio_dev
, chan
->address
);
93 mutex_unlock(&indio_dev
->mlock
);
96 ret
= adis16060_spi_read(indio_dev
, &tval
);
97 mutex_unlock(&indio_dev
->mlock
);
100 case IIO_CHAN_INFO_OFFSET
:
103 return IIO_VAL_INT_PLUS_MICRO
;
104 case IIO_CHAN_INFO_SCALE
:
107 return IIO_VAL_INT_PLUS_MICRO
;
113 static const struct iio_info adis16060_info
= {
114 .read_raw
= &adis16060_read_raw
,
115 .driver_module
= THIS_MODULE
,
118 static const struct iio_chan_spec adis16060_channels
[] = {
120 .type
= IIO_ANGL_VEL
,
122 .channel2
= IIO_MOD_Z
,
123 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
,
124 .address
= ADIS16060_GYRO
,
129 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
,
130 .address
= ADIS16060_AIN1
,
135 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
,
136 .address
= ADIS16060_AIN2
,
141 .info_mask
= IIO_CHAN_INFO_RAW_SEPARATE_BIT
|
142 IIO_CHAN_INFO_OFFSET_SEPARATE_BIT
|
143 IIO_CHAN_INFO_SCALE_SEPARATE_BIT
,
144 .address
= ADIS16060_TEMP_OUT
,
148 static int __devinit
adis16060_r_probe(struct spi_device
*spi
)
151 struct adis16060_state
*st
;
152 struct iio_dev
*indio_dev
;
154 /* setup the industrialio driver allocated elements */
155 indio_dev
= iio_device_alloc(sizeof(*st
));
156 if (indio_dev
== NULL
) {
160 /* this is only used for removal purposes */
161 spi_set_drvdata(spi
, indio_dev
);
162 st
= iio_priv(indio_dev
);
164 mutex_init(&st
->buf_lock
);
166 indio_dev
->name
= spi
->dev
.driver
->name
;
167 indio_dev
->dev
.parent
= &spi
->dev
;
168 indio_dev
->info
= &adis16060_info
;
169 indio_dev
->modes
= INDIO_DIRECT_MODE
;
170 indio_dev
->channels
= adis16060_channels
;
171 indio_dev
->num_channels
= ARRAY_SIZE(adis16060_channels
);
173 ret
= iio_device_register(indio_dev
);
177 adis16060_iio_dev
= indio_dev
;
181 iio_device_free(indio_dev
);
186 /* fixme, confirm ordering in this function */
187 static int __devexit
adis16060_r_remove(struct spi_device
*spi
)
189 iio_device_unregister(spi_get_drvdata(spi
));
190 iio_device_free(spi_get_drvdata(spi
));
195 static int __devinit
adis16060_w_probe(struct spi_device
*spi
)
198 struct iio_dev
*indio_dev
= adis16060_iio_dev
;
199 struct adis16060_state
*st
;
204 st
= iio_priv(indio_dev
);
205 spi_set_drvdata(spi
, indio_dev
);
213 static int __devexit
adis16060_w_remove(struct spi_device
*spi
)
218 static struct spi_driver adis16060_r_driver
= {
220 .name
= "adis16060_r",
221 .owner
= THIS_MODULE
,
223 .probe
= adis16060_r_probe
,
224 .remove
= __devexit_p(adis16060_r_remove
),
227 static struct spi_driver adis16060_w_driver
= {
229 .name
= "adis16060_w",
230 .owner
= THIS_MODULE
,
232 .probe
= adis16060_w_probe
,
233 .remove
= __devexit_p(adis16060_w_remove
),
236 static __init
int adis16060_init(void)
240 ret
= spi_register_driver(&adis16060_r_driver
);
244 ret
= spi_register_driver(&adis16060_w_driver
);
246 spi_unregister_driver(&adis16060_r_driver
);
252 module_init(adis16060_init
);
254 static __exit
void adis16060_exit(void)
256 spi_unregister_driver(&adis16060_w_driver
);
257 spi_unregister_driver(&adis16060_r_driver
);
259 module_exit(adis16060_exit
);
261 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
262 MODULE_DESCRIPTION("Analog Devices ADIS16060 Yaw Rate Gyroscope Driver");
263 MODULE_LICENSE("GPL v2");