1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
/*
* STMicroelectronics sensors library driver
*
* Copyright 2012-2013 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*
* Licensed under the GPL-2.
*/
#ifndef ST_SENSORS_H
#define ST_SENSORS_H
#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/irqreturn.h>
#include <linux/iio/trigger.h>
#define ST_SENSORS_TX_MAX_LENGTH 2
#define ST_SENSORS_RX_MAX_LENGTH 6
#define ST_SENSORS_ODR_LIST_MAX 10
#define ST_SENSORS_FULLSCALE_AVL_MAX 10
#define ST_SENSORS_NUMBER_ALL_CHANNELS 4
#define ST_SENSORS_NUMBER_DATA_CHANNELS 3
#define ST_SENSORS_ENABLE_ALL_AXIS 0x07
#define ST_SENSORS_BYTE_FOR_CHANNEL 2
#define ST_SENSORS_SCAN_X 0
#define ST_SENSORS_SCAN_Y 1
#define ST_SENSORS_SCAN_Z 2
#define ST_SENSORS_DEFAULT_12_REALBITS 12
#define ST_SENSORS_DEFAULT_16_REALBITS 16
#define ST_SENSORS_DEFAULT_POWER_ON_VALUE 0x01
#define ST_SENSORS_DEFAULT_POWER_OFF_VALUE 0x00
#define ST_SENSORS_DEFAULT_WAI_ADDRESS 0x0f
#define ST_SENSORS_DEFAULT_AXIS_ADDR 0x20
#define ST_SENSORS_DEFAULT_AXIS_MASK 0x07
#define ST_SENSORS_DEFAULT_AXIS_N_BIT 3
#define ST_SENSORS_MAX_NAME 17
#define ST_SENSORS_MAX_4WAI 7
#define ST_SENSORS_LSM_CHANNELS(device_type, index, mod, endian, bits, addr) \
{ \
.type = device_type, \
.modified = 1, \
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
.scan_index = index, \
.channel2 = mod, \
.address = addr, \
.scan_type = { \
.sign = 's', \
.realbits = bits, \
.shift = 16 - bits, \
.storagebits = 16, \
.endianness = endian, \
}, \
}
#define ST_SENSOR_DEV_ATTR_SAMP_FREQ() \
IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, \
st_sensors_sysfs_get_sampling_frequency, \
st_sensors_sysfs_set_sampling_frequency)
#define ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL() \
IIO_DEV_ATTR_SAMP_FREQ_AVAIL( \
st_sensors_sysfs_sampling_frequency_avail)
#define ST_SENSORS_DEV_ATTR_SCALE_AVAIL(name) \
IIO_DEVICE_ATTR(name, S_IRUGO, \
st_sensors_sysfs_scale_avail, NULL , 0);
struct st_sensor_odr_avl {
unsigned int hz;
u8 value;
};
struct st_sensor_odr {
u8 addr;
u8 mask;
struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
};
struct st_sensor_power {
u8 addr;
u8 mask;
u8 value_off;
u8 value_on;
};
struct st_sensor_axis {
u8 addr;
u8 mask;
};
struct st_sensor_fullscale_avl {
unsigned int num;
u8 value;
unsigned int gain;
unsigned int gain2;
};
struct st_sensor_fullscale {
u8 addr;
u8 mask;
struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
};
/**
* struct st_sensor_bdu - ST sensor device block data update
* @addr: address of the register.
* @mask: mask to write the block data update flag.
*/
struct st_sensor_bdu {
u8 addr;
u8 mask;
};
/**
* struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
* @addr: address of the register.
* @mask: mask to write the on/off value.
* struct ig1 - represents the Interrupt Generator 1 of sensors.
* @en_addr: address of the enable ig1 register.
* @en_mask: mask to write the on/off value for enable.
*/
struct st_sensor_data_ready_irq {
u8 addr;
u8 mask;
struct {
u8 en_addr;
u8 en_mask;
} ig1;
};
/**
* struct st_sensor_transfer_buffer - ST sensor device I/O buffer
* @buf_lock: Mutex to protect rx and tx buffers.
* @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
* This buffer is used to avoid DMA not-aligned issue.
* @rx_buf: Buffer used by SPI transfer to receive data from sensors.
* This buffer is used to avoid DMA not-aligned issue.
*/
struct st_sensor_transfer_buffer {
struct mutex buf_lock;
u8 rx_buf[ST_SENSORS_RX_MAX_LENGTH];
u8 tx_buf[ST_SENSORS_TX_MAX_LENGTH] ____cacheline_aligned;
};
/**
* struct st_sensor_transfer_function - ST sensor device I/O function
* @read_byte: Function used to read one byte.
* @write_byte: Function used to write one byte.
* @read_multiple_byte: Function used to read multiple byte.
*/
struct st_sensor_transfer_function {
int (*read_byte) (struct st_sensor_transfer_buffer *tb,
struct device *dev, u8 reg_addr, u8 *res_byte);
int (*write_byte) (struct st_sensor_transfer_buffer *tb,
struct device *dev, u8 reg_addr, u8 data);
int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
struct device *dev, u8 reg_addr, int len, u8 *data,
bool multiread_bit);
};
/**
* struct st_sensors - ST sensors list
* @wai: Contents of WhoAmI register.
* @sensors_supported: List of supported sensors by struct itself.
* @ch: IIO channels for the sensor.
* @odr: Output data rate register and ODR list available.
* @pw: Power register of the sensor.
* @enable_axis: Enable one or more axis of the sensor.
* @fs: Full scale register and full scale list available.
* @bdu: Block data update register.
* @drdy_irq: Data ready register of the sensor.
* @multi_read_bit: Use or not particular bit for [I2C/SPI] multi-read.
* @bootime: samples to discard when sensor passing from power-down to power-up.
*/
struct st_sensors {
u8 wai;
char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
struct iio_chan_spec *ch;
struct st_sensor_odr odr;
struct st_sensor_power pw;
struct st_sensor_axis enable_axis;
struct st_sensor_fullscale fs;
struct st_sensor_bdu bdu;
struct st_sensor_data_ready_irq drdy_irq;
bool multi_read_bit;
unsigned int bootime;
};
/**
* struct st_sensor_data - ST sensor device status
* @dev: Pointer to instance of struct device (I2C or SPI).
* @trig: The trigger in use by the core driver.
* @sensor: Pointer to the current sensor struct in use.
* @current_fullscale: Maximum range of measure by the sensor.
* @enabled: Status of the sensor (false->off, true->on).
* @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
* @buffer_data: Data used by buffer part.
* @odr: Output data rate of the sensor [Hz].
* @get_irq_data_ready: Function to get the IRQ used for data ready signal.
* @tf: Transfer function structure used by I/O operations.
* @tb: Transfer buffers and mutex used by I/O operations.
*/
struct st_sensor_data {
struct device *dev;
struct iio_trigger *trig;
struct st_sensors *sensor;
struct st_sensor_fullscale_avl *current_fullscale;
bool enabled;
bool multiread_bit;
char *buffer_data;
unsigned int odr;
unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
const struct st_sensor_transfer_function *tf;
struct st_sensor_transfer_buffer tb;
};
#ifdef CONFIG_IIO_BUFFER
irqreturn_t st_sensors_trigger_handler(int irq, void *p);
int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf);
#endif
#ifdef CONFIG_IIO_TRIGGER
int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
const struct iio_trigger_ops *trigger_ops);
void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
#else
static inline int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
const struct iio_trigger_ops *trigger_ops)
{
return 0;
}
static inline void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
{
return;
}
#endif
int st_sensors_init_sensor(struct iio_dev *indio_dev);
int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable);
int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale);
int st_sensors_read_info_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *ch, int *val);
int st_sensors_check_device_support(struct iio_dev *indio_dev,
int num_sensors_list, const struct st_sensors *sensors);
ssize_t st_sensors_sysfs_get_sampling_frequency(struct device *dev,
struct device_attribute *attr, char *buf);
ssize_t st_sensors_sysfs_set_sampling_frequency(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size);
ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
struct device_attribute *attr, char *buf);
ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
struct device_attribute *attr, char *buf);
#endif /* ST_SENSORS_H */
|
