Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * STMicroelectronics pressures driver |
| 3 | * |
| 4 | * Copyright 2013 STMicroelectronics Inc. |
| 5 | * |
| 6 | * Denis Ciocca <denis.ciocca@st.com> |
| 7 | * |
| 8 | * Licensed under the GPL-2. |
| 9 | */ |
| 10 | |
| 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> |
| 27 | |
| 28 | #include <linux/iio/common/st_sensors.h> |
| 29 | #include "st_pressure.h" |
| 30 | |
Jacek Anaszewski | 67dbf54 | 2013-07-02 11:13:00 +0100 | [diff] [blame] | 31 | #define ST_PRESS_LSB_PER_MBAR 4096UL |
| 32 | #define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \ |
| 33 | ST_PRESS_LSB_PER_MBAR) |
Jacek Anaszewski | 1003eb6 | 2013-07-02 11:13:00 +0100 | [diff] [blame] | 34 | #define ST_PRESS_LSB_PER_CELSIUS 480UL |
| 35 | #define ST_PRESS_CELSIUS_NANO_SCALE (1000000000UL / \ |
| 36 | ST_PRESS_LSB_PER_CELSIUS) |
Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 37 | #define ST_PRESS_NUMBER_DATA_CHANNELS 1 |
| 38 | |
| 39 | /* DEFAULT VALUE FOR SENSORS */ |
| 40 | #define ST_PRESS_DEFAULT_OUT_XL_ADDR 0x28 |
| 41 | #define ST_TEMP_DEFAULT_OUT_L_ADDR 0x2b |
| 42 | |
| 43 | /* FULLSCALE */ |
| 44 | #define ST_PRESS_FS_AVL_1260MB 1260 |
| 45 | |
| 46 | /* CUSTOM VALUES FOR SENSOR 1 */ |
| 47 | #define ST_PRESS_1_WAI_EXP 0xbb |
| 48 | #define ST_PRESS_1_ODR_ADDR 0x20 |
| 49 | #define ST_PRESS_1_ODR_MASK 0x70 |
| 50 | #define ST_PRESS_1_ODR_AVL_1HZ_VAL 0x01 |
| 51 | #define ST_PRESS_1_ODR_AVL_7HZ_VAL 0x05 |
| 52 | #define ST_PRESS_1_ODR_AVL_13HZ_VAL 0x06 |
| 53 | #define ST_PRESS_1_ODR_AVL_25HZ_VAL 0x07 |
| 54 | #define ST_PRESS_1_PW_ADDR 0x20 |
| 55 | #define ST_PRESS_1_PW_MASK 0x80 |
| 56 | #define ST_PRESS_1_FS_ADDR 0x23 |
| 57 | #define ST_PRESS_1_FS_MASK 0x30 |
| 58 | #define ST_PRESS_1_FS_AVL_1260_VAL 0x00 |
Jacek Anaszewski | 67dbf54 | 2013-07-02 11:13:00 +0100 | [diff] [blame] | 59 | #define ST_PRESS_1_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE |
Jacek Anaszewski | 1003eb6 | 2013-07-02 11:13:00 +0100 | [diff] [blame] | 60 | #define ST_PRESS_1_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE |
Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 61 | #define ST_PRESS_1_BDU_ADDR 0x20 |
| 62 | #define ST_PRESS_1_BDU_MASK 0x04 |
| 63 | #define ST_PRESS_1_DRDY_IRQ_ADDR 0x22 |
Denis CIOCCA | 23cde4d | 2013-06-19 09:28:00 +0100 | [diff] [blame] | 64 | #define ST_PRESS_1_DRDY_IRQ_INT1_MASK 0x04 |
| 65 | #define ST_PRESS_1_DRDY_IRQ_INT2_MASK 0x20 |
Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 66 | #define ST_PRESS_1_MULTIREAD_BIT true |
| 67 | #define ST_PRESS_1_TEMP_OFFSET 42500 |
| 68 | |
| 69 | static const struct iio_chan_spec st_press_channels[] = { |
| 70 | ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE, |
| 71 | BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), |
| 72 | ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24, |
| 73 | ST_PRESS_DEFAULT_OUT_XL_ADDR), |
| 74 | ST_SENSORS_LSM_CHANNELS(IIO_TEMP, |
| 75 | BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | |
| 76 | BIT(IIO_CHAN_INFO_OFFSET), |
| 77 | -1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16, |
| 78 | ST_TEMP_DEFAULT_OUT_L_ADDR), |
| 79 | IIO_CHAN_SOFT_TIMESTAMP(1) |
| 80 | }; |
| 81 | |
| 82 | static const struct st_sensors st_press_sensors[] = { |
| 83 | { |
| 84 | .wai = ST_PRESS_1_WAI_EXP, |
| 85 | .sensors_supported = { |
| 86 | [0] = LPS331AP_PRESS_DEV_NAME, |
| 87 | }, |
| 88 | .ch = (struct iio_chan_spec *)st_press_channels, |
| 89 | .odr = { |
| 90 | .addr = ST_PRESS_1_ODR_ADDR, |
| 91 | .mask = ST_PRESS_1_ODR_MASK, |
| 92 | .odr_avl = { |
| 93 | { 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, }, |
| 94 | { 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, }, |
| 95 | { 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, }, |
| 96 | { 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, }, |
| 97 | }, |
| 98 | }, |
| 99 | .pw = { |
| 100 | .addr = ST_PRESS_1_PW_ADDR, |
| 101 | .mask = ST_PRESS_1_PW_MASK, |
| 102 | .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, |
| 103 | .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, |
| 104 | }, |
| 105 | .fs = { |
| 106 | .addr = ST_PRESS_1_FS_ADDR, |
| 107 | .mask = ST_PRESS_1_FS_MASK, |
| 108 | .fs_avl = { |
| 109 | [0] = { |
| 110 | .num = ST_PRESS_FS_AVL_1260MB, |
| 111 | .value = ST_PRESS_1_FS_AVL_1260_VAL, |
| 112 | .gain = ST_PRESS_1_FS_AVL_1260_GAIN, |
| 113 | .gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN, |
| 114 | }, |
| 115 | }, |
| 116 | }, |
| 117 | .bdu = { |
| 118 | .addr = ST_PRESS_1_BDU_ADDR, |
| 119 | .mask = ST_PRESS_1_BDU_MASK, |
| 120 | }, |
| 121 | .drdy_irq = { |
| 122 | .addr = ST_PRESS_1_DRDY_IRQ_ADDR, |
Denis CIOCCA | 23cde4d | 2013-06-19 09:28:00 +0100 | [diff] [blame] | 123 | .mask_int1 = ST_PRESS_1_DRDY_IRQ_INT1_MASK, |
| 124 | .mask_int2 = ST_PRESS_1_DRDY_IRQ_INT2_MASK, |
Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 125 | }, |
| 126 | .multi_read_bit = ST_PRESS_1_MULTIREAD_BIT, |
| 127 | .bootime = 2, |
| 128 | }, |
| 129 | }; |
| 130 | |
| 131 | static int st_press_read_raw(struct iio_dev *indio_dev, |
| 132 | struct iio_chan_spec const *ch, int *val, |
| 133 | int *val2, long mask) |
| 134 | { |
| 135 | int err; |
| 136 | struct st_sensor_data *pdata = iio_priv(indio_dev); |
| 137 | |
| 138 | switch (mask) { |
| 139 | case IIO_CHAN_INFO_RAW: |
| 140 | err = st_sensors_read_info_raw(indio_dev, ch, val); |
| 141 | if (err < 0) |
| 142 | goto read_error; |
| 143 | |
| 144 | return IIO_VAL_INT; |
| 145 | case IIO_CHAN_INFO_SCALE: |
| 146 | *val = 0; |
| 147 | |
| 148 | switch (ch->type) { |
| 149 | case IIO_PRESSURE: |
| 150 | *val2 = pdata->current_fullscale->gain; |
| 151 | break; |
| 152 | case IIO_TEMP: |
| 153 | *val2 = pdata->current_fullscale->gain2; |
| 154 | break; |
| 155 | default: |
| 156 | err = -EINVAL; |
| 157 | goto read_error; |
| 158 | } |
| 159 | |
| 160 | return IIO_VAL_INT_PLUS_NANO; |
| 161 | case IIO_CHAN_INFO_OFFSET: |
| 162 | switch (ch->type) { |
| 163 | case IIO_TEMP: |
| 164 | *val = 425; |
| 165 | *val2 = 10; |
| 166 | break; |
| 167 | default: |
| 168 | err = -EINVAL; |
| 169 | goto read_error; |
| 170 | } |
| 171 | |
| 172 | return IIO_VAL_FRACTIONAL; |
| 173 | default: |
| 174 | return -EINVAL; |
| 175 | } |
| 176 | |
| 177 | read_error: |
| 178 | return err; |
| 179 | } |
| 180 | |
| 181 | static ST_SENSOR_DEV_ATTR_SAMP_FREQ(); |
| 182 | static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL(); |
| 183 | |
| 184 | static struct attribute *st_press_attributes[] = { |
| 185 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
| 186 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
| 187 | NULL, |
| 188 | }; |
| 189 | |
| 190 | static const struct attribute_group st_press_attribute_group = { |
| 191 | .attrs = st_press_attributes, |
| 192 | }; |
| 193 | |
| 194 | static const struct iio_info press_info = { |
| 195 | .driver_module = THIS_MODULE, |
| 196 | .attrs = &st_press_attribute_group, |
| 197 | .read_raw = &st_press_read_raw, |
| 198 | }; |
| 199 | |
| 200 | #ifdef CONFIG_IIO_TRIGGER |
| 201 | static const struct iio_trigger_ops st_press_trigger_ops = { |
| 202 | .owner = THIS_MODULE, |
| 203 | .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE, |
| 204 | }; |
| 205 | #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops) |
| 206 | #else |
| 207 | #define ST_PRESS_TRIGGER_OPS NULL |
| 208 | #endif |
| 209 | |
Denis CIOCCA | 23cde4d | 2013-06-19 09:28:00 +0100 | [diff] [blame] | 210 | int st_press_common_probe(struct iio_dev *indio_dev, |
| 211 | struct st_sensors_platform_data *plat_data) |
Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 212 | { |
| 213 | int err; |
| 214 | struct st_sensor_data *pdata = iio_priv(indio_dev); |
| 215 | |
| 216 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 217 | indio_dev->info = &press_info; |
| 218 | |
| 219 | err = st_sensors_check_device_support(indio_dev, |
| 220 | ARRAY_SIZE(st_press_sensors), st_press_sensors); |
| 221 | if (err < 0) |
| 222 | goto st_press_common_probe_error; |
| 223 | |
| 224 | pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS; |
| 225 | pdata->multiread_bit = pdata->sensor->multi_read_bit; |
| 226 | indio_dev->channels = pdata->sensor->ch; |
| 227 | indio_dev->num_channels = ARRAY_SIZE(st_press_channels); |
| 228 | |
| 229 | pdata->current_fullscale = (struct st_sensor_fullscale_avl *) |
| 230 | &pdata->sensor->fs.fs_avl[0]; |
| 231 | pdata->odr = pdata->sensor->odr.odr_avl[0].hz; |
| 232 | |
Denis CIOCCA | 23cde4d | 2013-06-19 09:28:00 +0100 | [diff] [blame] | 233 | if (!plat_data) |
| 234 | plat_data = |
| 235 | (struct st_sensors_platform_data *)&default_press_pdata; |
| 236 | |
| 237 | err = st_sensors_init_sensor(indio_dev, plat_data); |
Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 238 | if (err < 0) |
| 239 | goto st_press_common_probe_error; |
| 240 | |
| 241 | if (pdata->get_irq_data_ready(indio_dev) > 0) { |
| 242 | err = st_press_allocate_ring(indio_dev); |
| 243 | if (err < 0) |
| 244 | goto st_press_common_probe_error; |
| 245 | |
| 246 | err = st_sensors_allocate_trigger(indio_dev, |
| 247 | ST_PRESS_TRIGGER_OPS); |
| 248 | if (err < 0) |
| 249 | goto st_press_probe_trigger_error; |
| 250 | } |
| 251 | |
| 252 | err = iio_device_register(indio_dev); |
| 253 | if (err) |
| 254 | goto st_press_device_register_error; |
| 255 | |
| 256 | return err; |
| 257 | |
| 258 | st_press_device_register_error: |
| 259 | if (pdata->get_irq_data_ready(indio_dev) > 0) |
| 260 | st_sensors_deallocate_trigger(indio_dev); |
| 261 | st_press_probe_trigger_error: |
| 262 | if (pdata->get_irq_data_ready(indio_dev) > 0) |
| 263 | st_press_deallocate_ring(indio_dev); |
| 264 | st_press_common_probe_error: |
| 265 | return err; |
| 266 | } |
| 267 | EXPORT_SYMBOL(st_press_common_probe); |
| 268 | |
| 269 | void st_press_common_remove(struct iio_dev *indio_dev) |
| 270 | { |
| 271 | struct st_sensor_data *pdata = iio_priv(indio_dev); |
| 272 | |
| 273 | iio_device_unregister(indio_dev); |
| 274 | if (pdata->get_irq_data_ready(indio_dev) > 0) { |
| 275 | st_sensors_deallocate_trigger(indio_dev); |
| 276 | st_press_deallocate_ring(indio_dev); |
| 277 | } |
Denis CIOCCA | 217494e | 2013-06-03 15:58:00 +0100 | [diff] [blame] | 278 | } |
| 279 | EXPORT_SYMBOL(st_press_common_remove); |
| 280 | |
| 281 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); |
| 282 | MODULE_DESCRIPTION("STMicroelectronics pressures driver"); |
| 283 | MODULE_LICENSE("GPL v2"); |