2 * STMicroelectronics sensors library driver
4 * Copyright 2012-2013 STMicroelectronics Inc.
6 * Denis Ciocca <denis.ciocca@st.com>
8 * Licensed under the GPL-2.
14 #include <linux/i2c.h>
15 #include <linux/spi/spi.h>
16 #include <linux/irqreturn.h>
17 #include <linux/iio/trigger.h>
18 #include <linux/bitops.h>
20 #define ST_SENSORS_TX_MAX_LENGTH 2
21 #define ST_SENSORS_RX_MAX_LENGTH 6
23 #define ST_SENSORS_ODR_LIST_MAX 10
24 #define ST_SENSORS_FULLSCALE_AVL_MAX 10
26 #define ST_SENSORS_NUMBER_ALL_CHANNELS 4
27 #define ST_SENSORS_NUMBER_DATA_CHANNELS 3
28 #define ST_SENSORS_ENABLE_ALL_AXIS 0x07
29 #define ST_SENSORS_BYTE_FOR_CHANNEL 2
30 #define ST_SENSORS_SCAN_X 0
31 #define ST_SENSORS_SCAN_Y 1
32 #define ST_SENSORS_SCAN_Z 2
33 #define ST_SENSORS_DEFAULT_12_REALBITS 12
34 #define ST_SENSORS_DEFAULT_16_REALBITS 16
35 #define ST_SENSORS_DEFAULT_POWER_ON_VALUE 0x01
36 #define ST_SENSORS_DEFAULT_POWER_OFF_VALUE 0x00
37 #define ST_SENSORS_DEFAULT_WAI_ADDRESS 0x0f
38 #define ST_SENSORS_DEFAULT_AXIS_ADDR 0x20
39 #define ST_SENSORS_DEFAULT_AXIS_MASK 0x07
40 #define ST_SENSORS_DEFAULT_AXIS_N_BIT 3
42 #define ST_SENSORS_MAX_NAME 17
43 #define ST_SENSORS_MAX_4WAI 7
45 #define ST_SENSORS_LSM_CHANNELS(device_type, index, mod, endian, bits, addr) \
47 .type = device_type, \
49 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
50 BIT(IIO_CHAN_INFO_SCALE), \
51 .scan_index = index, \
59 .endianness = endian, \
63 #define ST_SENSOR_DEV_ATTR_SAMP_FREQ() \
64 IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, \
65 st_sensors_sysfs_get_sampling_frequency, \
66 st_sensors_sysfs_set_sampling_frequency)
68 #define ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL() \
69 IIO_DEV_ATTR_SAMP_FREQ_AVAIL( \
70 st_sensors_sysfs_sampling_frequency_avail)
72 #define ST_SENSORS_DEV_ATTR_SCALE_AVAIL(name) \
73 IIO_DEVICE_ATTR(name, S_IRUGO, \
74 st_sensors_sysfs_scale_avail, NULL , 0);
76 struct st_sensor_odr_avl {
81 struct st_sensor_odr {
84 struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
87 struct st_sensor_power {
94 struct st_sensor_axis {
99 struct st_sensor_fullscale_avl {
106 struct st_sensor_fullscale {
109 struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
113 * struct st_sensor_bdu - ST sensor device block data update
114 * @addr: address of the register.
115 * @mask: mask to write the block data update flag.
117 struct st_sensor_bdu {
123 * struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
124 * @addr: address of the register.
125 * @mask: mask to write the on/off value.
126 * struct ig1 - represents the Interrupt Generator 1 of sensors.
127 * @en_addr: address of the enable ig1 register.
128 * @en_mask: mask to write the on/off value for enable.
130 struct st_sensor_data_ready_irq {
140 * struct st_sensor_transfer_buffer - ST sensor device I/O buffer
141 * @buf_lock: Mutex to protect rx and tx buffers.
142 * @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
143 * This buffer is used to avoid DMA not-aligned issue.
144 * @rx_buf: Buffer used by SPI transfer to receive data from sensors.
145 * This buffer is used to avoid DMA not-aligned issue.
147 struct st_sensor_transfer_buffer {
148 struct mutex buf_lock;
149 u8 rx_buf[ST_SENSORS_RX_MAX_LENGTH];
150 u8 tx_buf[ST_SENSORS_TX_MAX_LENGTH] ____cacheline_aligned;
154 * struct st_sensor_transfer_function - ST sensor device I/O function
155 * @read_byte: Function used to read one byte.
156 * @write_byte: Function used to write one byte.
157 * @read_multiple_byte: Function used to read multiple byte.
159 struct st_sensor_transfer_function {
160 int (*read_byte) (struct st_sensor_transfer_buffer *tb,
161 struct device *dev, u8 reg_addr, u8 *res_byte);
162 int (*write_byte) (struct st_sensor_transfer_buffer *tb,
163 struct device *dev, u8 reg_addr, u8 data);
164 int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
165 struct device *dev, u8 reg_addr, int len, u8 *data,
170 * struct st_sensors - ST sensors list
171 * @wai: Contents of WhoAmI register.
172 * @sensors_supported: List of supported sensors by struct itself.
173 * @ch: IIO channels for the sensor.
174 * @odr: Output data rate register and ODR list available.
175 * @pw: Power register of the sensor.
176 * @enable_axis: Enable one or more axis of the sensor.
177 * @fs: Full scale register and full scale list available.
178 * @bdu: Block data update register.
179 * @drdy_irq: Data ready register of the sensor.
180 * @multi_read_bit: Use or not particular bit for [I2C/SPI] multi-read.
181 * @bootime: samples to discard when sensor passing from power-down to power-up.
185 char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
186 struct iio_chan_spec *ch;
187 struct st_sensor_odr odr;
188 struct st_sensor_power pw;
189 struct st_sensor_axis enable_axis;
190 struct st_sensor_fullscale fs;
191 struct st_sensor_bdu bdu;
192 struct st_sensor_data_ready_irq drdy_irq;
194 unsigned int bootime;
198 * struct st_sensor_data - ST sensor device status
199 * @dev: Pointer to instance of struct device (I2C or SPI).
200 * @trig: The trigger in use by the core driver.
201 * @sensor: Pointer to the current sensor struct in use.
202 * @current_fullscale: Maximum range of measure by the sensor.
203 * @enabled: Status of the sensor (false->off, true->on).
204 * @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
205 * @buffer_data: Data used by buffer part.
206 * @odr: Output data rate of the sensor [Hz].
207 * @get_irq_data_ready: Function to get the IRQ used for data ready signal.
208 * @tf: Transfer function structure used by I/O operations.
209 * @tb: Transfer buffers and mutex used by I/O operations.
211 struct st_sensor_data {
213 struct iio_trigger *trig;
214 struct st_sensors *sensor;
215 struct st_sensor_fullscale_avl *current_fullscale;
224 unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
226 const struct st_sensor_transfer_function *tf;
227 struct st_sensor_transfer_buffer tb;
230 #ifdef CONFIG_IIO_BUFFER
231 irqreturn_t st_sensors_trigger_handler(int irq, void *p);
233 int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf);
236 #ifdef CONFIG_IIO_TRIGGER
237 int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
238 const struct iio_trigger_ops *trigger_ops);
240 void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
243 static inline int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
244 const struct iio_trigger_ops *trigger_ops)
248 static inline void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
254 int st_sensors_init_sensor(struct iio_dev *indio_dev);
256 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable);
258 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
260 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
262 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
264 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale);
266 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
267 struct iio_chan_spec const *ch, int *val);
269 int st_sensors_check_device_support(struct iio_dev *indio_dev,
270 int num_sensors_list, const struct st_sensors *sensors);
272 ssize_t st_sensors_sysfs_get_sampling_frequency(struct device *dev,
273 struct device_attribute *attr, char *buf);
275 ssize_t st_sensors_sysfs_set_sampling_frequency(struct device *dev,
276 struct device_attribute *attr, const char *buf, size_t size);
278 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
279 struct device_attribute *attr, char *buf);
281 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
282 struct device_attribute *attr, char *buf);
284 #endif /* ST_SENSORS_H */