2 * STMicroelectronics pressures driver
4 * Copyright 2013 STMicroelectronics Inc.
6 * Denis Ciocca <denis.ciocca@st.com>
8 * Licensed under the GPL-2.
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/errno.h>
15 #include <linux/types.h>
16 #include <linux/mutex.h>
17 #include <linux/interrupt.h>
18 #include <linux/i2c.h>
19 #include <linux/gpio.h>
20 #include <linux/irq.h>
21 #include <linux/delay.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/trigger.h>
25 #include <linux/iio/buffer.h>
26 #include <asm/unaligned.h>
28 #include <linux/iio/common/st_sensors.h>
29 #include "st_pressure.h"
31 #define ST_PRESS_MBAR_TO_KPASCAL(x) (x * 10)
32 #define ST_PRESS_NUMBER_DATA_CHANNELS 1
34 /* DEFAULT VALUE FOR SENSORS */
35 #define ST_PRESS_DEFAULT_OUT_XL_ADDR 0x28
36 #define ST_TEMP_DEFAULT_OUT_L_ADDR 0x2b
39 #define ST_PRESS_FS_AVL_1260MB 1260
41 /* CUSTOM VALUES FOR SENSOR 1 */
42 #define ST_PRESS_1_WAI_EXP 0xbb
43 #define ST_PRESS_1_ODR_ADDR 0x20
44 #define ST_PRESS_1_ODR_MASK 0x70
45 #define ST_PRESS_1_ODR_AVL_1HZ_VAL 0x01
46 #define ST_PRESS_1_ODR_AVL_7HZ_VAL 0x05
47 #define ST_PRESS_1_ODR_AVL_13HZ_VAL 0x06
48 #define ST_PRESS_1_ODR_AVL_25HZ_VAL 0x07
49 #define ST_PRESS_1_PW_ADDR 0x20
50 #define ST_PRESS_1_PW_MASK 0x80
51 #define ST_PRESS_1_FS_ADDR 0x23
52 #define ST_PRESS_1_FS_MASK 0x30
53 #define ST_PRESS_1_FS_AVL_1260_VAL 0x00
54 #define ST_PRESS_1_FS_AVL_1260_GAIN ST_PRESS_MBAR_TO_KPASCAL(244141)
55 #define ST_PRESS_1_FS_AVL_TEMP_GAIN 2083000
56 #define ST_PRESS_1_BDU_ADDR 0x20
57 #define ST_PRESS_1_BDU_MASK 0x04
58 #define ST_PRESS_1_DRDY_IRQ_ADDR 0x22
59 #define ST_PRESS_1_DRDY_IRQ_MASK 0x04
60 #define ST_PRESS_1_MULTIREAD_BIT true
61 #define ST_PRESS_1_TEMP_OFFSET 42500
63 static const struct iio_chan_spec st_press_channels
[] = {
64 ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE
,
65 BIT(IIO_CHAN_INFO_RAW
) | BIT(IIO_CHAN_INFO_SCALE
),
66 ST_SENSORS_SCAN_X
, 0, IIO_NO_MOD
, 'u', IIO_LE
, 24, 24,
67 ST_PRESS_DEFAULT_OUT_XL_ADDR
),
68 ST_SENSORS_LSM_CHANNELS(IIO_TEMP
,
69 BIT(IIO_CHAN_INFO_RAW
) | BIT(IIO_CHAN_INFO_SCALE
) |
70 BIT(IIO_CHAN_INFO_OFFSET
),
71 -1, 0, IIO_NO_MOD
, 's', IIO_LE
, 16, 16,
72 ST_TEMP_DEFAULT_OUT_L_ADDR
),
73 IIO_CHAN_SOFT_TIMESTAMP(1)
76 static const struct st_sensors st_press_sensors
[] = {
78 .wai
= ST_PRESS_1_WAI_EXP
,
79 .sensors_supported
= {
80 [0] = LPS331AP_PRESS_DEV_NAME
,
82 .ch
= (struct iio_chan_spec
*)st_press_channels
,
84 .addr
= ST_PRESS_1_ODR_ADDR
,
85 .mask
= ST_PRESS_1_ODR_MASK
,
87 { 1, ST_PRESS_1_ODR_AVL_1HZ_VAL
, },
88 { 7, ST_PRESS_1_ODR_AVL_7HZ_VAL
, },
89 { 13, ST_PRESS_1_ODR_AVL_13HZ_VAL
, },
90 { 25, ST_PRESS_1_ODR_AVL_25HZ_VAL
, },
94 .addr
= ST_PRESS_1_PW_ADDR
,
95 .mask
= ST_PRESS_1_PW_MASK
,
96 .value_on
= ST_SENSORS_DEFAULT_POWER_ON_VALUE
,
97 .value_off
= ST_SENSORS_DEFAULT_POWER_OFF_VALUE
,
100 .addr
= ST_PRESS_1_FS_ADDR
,
101 .mask
= ST_PRESS_1_FS_MASK
,
104 .num
= ST_PRESS_FS_AVL_1260MB
,
105 .value
= ST_PRESS_1_FS_AVL_1260_VAL
,
106 .gain
= ST_PRESS_1_FS_AVL_1260_GAIN
,
107 .gain2
= ST_PRESS_1_FS_AVL_TEMP_GAIN
,
112 .addr
= ST_PRESS_1_BDU_ADDR
,
113 .mask
= ST_PRESS_1_BDU_MASK
,
116 .addr
= ST_PRESS_1_DRDY_IRQ_ADDR
,
117 .mask
= ST_PRESS_1_DRDY_IRQ_MASK
,
119 .multi_read_bit
= ST_PRESS_1_MULTIREAD_BIT
,
124 static int st_press_read_raw(struct iio_dev
*indio_dev
,
125 struct iio_chan_spec
const *ch
, int *val
,
126 int *val2
, long mask
)
129 struct st_sensor_data
*pdata
= iio_priv(indio_dev
);
132 case IIO_CHAN_INFO_RAW
:
133 err
= st_sensors_read_info_raw(indio_dev
, ch
, val
);
138 case IIO_CHAN_INFO_SCALE
:
143 *val2
= pdata
->current_fullscale
->gain
;
146 *val2
= pdata
->current_fullscale
->gain2
;
153 return IIO_VAL_INT_PLUS_NANO
;
154 case IIO_CHAN_INFO_OFFSET
:
165 return IIO_VAL_FRACTIONAL
;
174 static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
175 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
177 static struct attribute
*st_press_attributes
[] = {
178 &iio_dev_attr_sampling_frequency_available
.dev_attr
.attr
,
179 &iio_dev_attr_sampling_frequency
.dev_attr
.attr
,
183 static const struct attribute_group st_press_attribute_group
= {
184 .attrs
= st_press_attributes
,
187 static const struct iio_info press_info
= {
188 .driver_module
= THIS_MODULE
,
189 .attrs
= &st_press_attribute_group
,
190 .read_raw
= &st_press_read_raw
,
193 #ifdef CONFIG_IIO_TRIGGER
194 static const struct iio_trigger_ops st_press_trigger_ops
= {
195 .owner
= THIS_MODULE
,
196 .set_trigger_state
= ST_PRESS_TRIGGER_SET_STATE
,
198 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
200 #define ST_PRESS_TRIGGER_OPS NULL
203 int st_press_common_probe(struct iio_dev
*indio_dev
)
206 struct st_sensor_data
*pdata
= iio_priv(indio_dev
);
208 indio_dev
->modes
= INDIO_DIRECT_MODE
;
209 indio_dev
->info
= &press_info
;
211 err
= st_sensors_check_device_support(indio_dev
,
212 ARRAY_SIZE(st_press_sensors
), st_press_sensors
);
214 goto st_press_common_probe_error
;
216 pdata
->num_data_channels
= ST_PRESS_NUMBER_DATA_CHANNELS
;
217 pdata
->multiread_bit
= pdata
->sensor
->multi_read_bit
;
218 indio_dev
->channels
= pdata
->sensor
->ch
;
219 indio_dev
->num_channels
= ARRAY_SIZE(st_press_channels
);
221 pdata
->current_fullscale
= (struct st_sensor_fullscale_avl
*)
222 &pdata
->sensor
->fs
.fs_avl
[0];
223 pdata
->odr
= pdata
->sensor
->odr
.odr_avl
[0].hz
;
225 err
= st_sensors_init_sensor(indio_dev
);
227 goto st_press_common_probe_error
;
229 if (pdata
->get_irq_data_ready(indio_dev
) > 0) {
230 err
= st_press_allocate_ring(indio_dev
);
232 goto st_press_common_probe_error
;
234 err
= st_sensors_allocate_trigger(indio_dev
,
235 ST_PRESS_TRIGGER_OPS
);
237 goto st_press_probe_trigger_error
;
240 err
= iio_device_register(indio_dev
);
242 goto st_press_device_register_error
;
246 st_press_device_register_error
:
247 if (pdata
->get_irq_data_ready(indio_dev
) > 0)
248 st_sensors_deallocate_trigger(indio_dev
);
249 st_press_probe_trigger_error
:
250 if (pdata
->get_irq_data_ready(indio_dev
) > 0)
251 st_press_deallocate_ring(indio_dev
);
252 st_press_common_probe_error
:
255 EXPORT_SYMBOL(st_press_common_probe
);
257 void st_press_common_remove(struct iio_dev
*indio_dev
)
259 struct st_sensor_data
*pdata
= iio_priv(indio_dev
);
261 iio_device_unregister(indio_dev
);
262 if (pdata
->get_irq_data_ready(indio_dev
) > 0) {
263 st_sensors_deallocate_trigger(indio_dev
);
264 st_press_deallocate_ring(indio_dev
);
266 iio_device_free(indio_dev
);
268 EXPORT_SYMBOL(st_press_common_remove
);
270 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
271 MODULE_DESCRIPTION("STMicroelectronics pressures driver");
272 MODULE_LICENSE("GPL v2");