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>
19 #include <linux/regulator/consumer.h>
21 #include <linux/platform_data/st_sensors_pdata.h>
23 #define ST_SENSORS_TX_MAX_LENGTH 2
24 #define ST_SENSORS_RX_MAX_LENGTH 6
26 #define ST_SENSORS_ODR_LIST_MAX 10
27 #define ST_SENSORS_FULLSCALE_AVL_MAX 10
29 #define ST_SENSORS_NUMBER_ALL_CHANNELS 4
30 #define ST_SENSORS_ENABLE_ALL_AXIS 0x07
31 #define ST_SENSORS_SCAN_X 0
32 #define ST_SENSORS_SCAN_Y 1
33 #define ST_SENSORS_SCAN_Z 2
34 #define ST_SENSORS_DEFAULT_POWER_ON_VALUE 0x01
35 #define ST_SENSORS_DEFAULT_POWER_OFF_VALUE 0x00
36 #define ST_SENSORS_DEFAULT_WAI_ADDRESS 0x0f
37 #define ST_SENSORS_DEFAULT_AXIS_ADDR 0x20
38 #define ST_SENSORS_DEFAULT_AXIS_MASK 0x07
39 #define ST_SENSORS_DEFAULT_AXIS_N_BIT 3
40 #define ST_SENSORS_DEFAULT_STAT_ADDR 0x27
42 #define ST_SENSORS_MAX_NAME 17
43 #define ST_SENSORS_MAX_4WAI 7
45 #define ST_SENSORS_LSM_CHANNELS(device_type, mask, index, mod, \
46 ch2, s, endian, rbits, sbits, addr) \
48 .type = device_type, \
50 .info_mask_separate = mask, \
51 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
52 .scan_index = index, \
58 .shift = sbits - rbits, \
59 .storagebits = sbits, \
60 .endianness = endian, \
64 #define ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL() \
65 IIO_DEV_ATTR_SAMP_FREQ_AVAIL( \
66 st_sensors_sysfs_sampling_frequency_avail)
68 #define ST_SENSORS_DEV_ATTR_SCALE_AVAIL(name) \
69 IIO_DEVICE_ATTR(name, S_IRUGO, \
70 st_sensors_sysfs_scale_avail, NULL , 0);
72 struct st_sensor_odr_avl {
77 struct st_sensor_odr {
80 struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
83 struct st_sensor_power {
90 struct st_sensor_axis {
95 struct st_sensor_fullscale_avl {
102 struct st_sensor_fullscale {
105 struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
109 * struct st_sensor_bdu - ST sensor device block data update
110 * @addr: address of the register.
111 * @mask: mask to write the block data update flag.
113 struct st_sensor_bdu {
119 * struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
120 * @addr: address of the register.
121 * @mask_int1: mask to enable/disable IRQ on INT1 pin.
122 * @mask_int2: mask to enable/disable IRQ on INT2 pin.
123 * @addr_ihl: address to enable/disable active low on the INT lines.
124 * @mask_ihl: mask to enable/disable active low on the INT lines.
125 * @addr_od: address to enable/disable Open Drain on the INT lines.
126 * @mask_od: mask to enable/disable Open Drain on the INT lines.
127 * @addr_stat_drdy: address to read status of DRDY (data ready) interrupt
128 * struct ig1 - represents the Interrupt Generator 1 of sensors.
129 * @en_addr: address of the enable ig1 register.
130 * @en_mask: mask to write the on/off value for enable.
132 struct st_sensor_data_ready_irq {
148 * struct st_sensor_transfer_buffer - ST sensor device I/O buffer
149 * @buf_lock: Mutex to protect rx and tx buffers.
150 * @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
151 * This buffer is used to avoid DMA not-aligned issue.
152 * @rx_buf: Buffer used by SPI transfer to receive data from sensors.
153 * This buffer is used to avoid DMA not-aligned issue.
155 struct st_sensor_transfer_buffer {
156 struct mutex buf_lock;
157 u8 rx_buf[ST_SENSORS_RX_MAX_LENGTH];
158 u8 tx_buf[ST_SENSORS_TX_MAX_LENGTH] ____cacheline_aligned;
162 * struct st_sensor_transfer_function - ST sensor device I/O function
163 * @read_byte: Function used to read one byte.
164 * @write_byte: Function used to write one byte.
165 * @read_multiple_byte: Function used to read multiple byte.
167 struct st_sensor_transfer_function {
168 int (*read_byte) (struct st_sensor_transfer_buffer *tb,
169 struct device *dev, u8 reg_addr, u8 *res_byte);
170 int (*write_byte) (struct st_sensor_transfer_buffer *tb,
171 struct device *dev, u8 reg_addr, u8 data);
172 int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
173 struct device *dev, u8 reg_addr, int len, u8 *data,
178 * struct st_sensor_settings - ST specific sensor settings
179 * @wai: Contents of WhoAmI register.
180 * @wai_addr: The address of WhoAmI register.
181 * @sensors_supported: List of supported sensors by struct itself.
182 * @ch: IIO channels for the sensor.
183 * @odr: Output data rate register and ODR list available.
184 * @pw: Power register of the sensor.
185 * @enable_axis: Enable one or more axis of the sensor.
186 * @fs: Full scale register and full scale list available.
187 * @bdu: Block data update register.
188 * @drdy_irq: Data ready register of the sensor.
189 * @multi_read_bit: Use or not particular bit for [I2C/SPI] multi-read.
190 * @bootime: samples to discard when sensor passing from power-down to power-up.
192 struct st_sensor_settings {
195 char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
196 struct iio_chan_spec *ch;
198 struct st_sensor_odr odr;
199 struct st_sensor_power pw;
200 struct st_sensor_axis enable_axis;
201 struct st_sensor_fullscale fs;
202 struct st_sensor_bdu bdu;
203 struct st_sensor_data_ready_irq drdy_irq;
205 unsigned int bootime;
209 * struct st_sensor_data - ST sensor device status
210 * @dev: Pointer to instance of struct device (I2C or SPI).
211 * @trig: The trigger in use by the core driver.
212 * @sensor_settings: Pointer to the specific sensor settings in use.
213 * @current_fullscale: Maximum range of measure by the sensor.
214 * @vdd: Pointer to sensor's Vdd power supply
215 * @vdd_io: Pointer to sensor's Vdd-IO power supply
216 * @enabled: Status of the sensor (false->off, true->on).
217 * @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
218 * @buffer_data: Data used by buffer part.
219 * @odr: Output data rate of the sensor [Hz].
220 * num_data_channels: Number of data channels used in buffer.
221 * @drdy_int_pin: Redirect DRDY on pin 1 (1) or pin 2 (2).
222 * @int_pin_open_drain: Set the interrupt/DRDY to open drain.
223 * @get_irq_data_ready: Function to get the IRQ used for data ready signal.
224 * @tf: Transfer function structure used by I/O operations.
225 * @tb: Transfer buffers and mutex used by I/O operations.
227 struct st_sensor_data {
229 struct iio_trigger *trig;
230 struct st_sensor_settings *sensor_settings;
231 struct st_sensor_fullscale_avl *current_fullscale;
232 struct regulator *vdd;
233 struct regulator *vdd_io;
241 unsigned int num_data_channels;
244 bool int_pin_open_drain;
246 unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
248 const struct st_sensor_transfer_function *tf;
249 struct st_sensor_transfer_buffer tb;
252 #ifdef CONFIG_IIO_BUFFER
253 irqreturn_t st_sensors_trigger_handler(int irq, void *p);
255 int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf);
258 #ifdef CONFIG_IIO_TRIGGER
259 int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
260 const struct iio_trigger_ops *trigger_ops);
262 void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
265 static inline int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
266 const struct iio_trigger_ops *trigger_ops)
270 static inline void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
276 int st_sensors_init_sensor(struct iio_dev *indio_dev,
277 struct st_sensors_platform_data *pdata);
279 int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable);
281 int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
283 void st_sensors_power_enable(struct iio_dev *indio_dev);
285 void st_sensors_power_disable(struct iio_dev *indio_dev);
287 int st_sensors_debugfs_reg_access(struct iio_dev *indio_dev,
288 unsigned reg, unsigned writeval,
291 int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr);
293 int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
295 int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale);
297 int st_sensors_read_info_raw(struct iio_dev *indio_dev,
298 struct iio_chan_spec const *ch, int *val);
300 int st_sensors_check_device_support(struct iio_dev *indio_dev,
301 int num_sensors_list, const struct st_sensor_settings *sensor_settings);
303 ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev,
304 struct device_attribute *attr, char *buf);
306 ssize_t st_sensors_sysfs_scale_avail(struct device *dev,
307 struct device_attribute *attr, char *buf);
309 #endif /* ST_SENSORS_H */