Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 1 | /* |
| 2 | * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor |
| 3 | * |
| 4 | * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com> |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of version 2 of |
| 7 | * the GNU General Public License. See the file COPYING in the main |
| 8 | * directory of this archive for more details. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/i2c.h> |
| 13 | #include <linux/interrupt.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/of.h> |
| 16 | #include <linux/bitops.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/string.h> |
| 19 | #include <linux/iio/iio.h> |
| 20 | #include <linux/iio/sysfs.h> |
| 21 | #include <linux/iio/buffer.h> |
| 22 | #include <linux/iio/trigger.h> |
| 23 | #include <linux/iio/trigger_consumer.h> |
| 24 | #include <linux/iio/triggered_buffer.h> |
| 25 | |
| 26 | #define BMA180_DRV_NAME "bma180" |
| 27 | #define BMA180_IRQ_NAME "bma180_event" |
| 28 | |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 29 | enum { |
| 30 | BMA180, |
| 31 | }; |
| 32 | |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 33 | struct bma180_data; |
| 34 | |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 35 | struct bma180_part_info { |
| 36 | const struct iio_chan_spec *channels; |
| 37 | unsigned num_channels; |
| 38 | const int *scale_table; |
| 39 | unsigned num_scales; |
| 40 | const int *bw_table; |
| 41 | unsigned num_bw; |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 42 | int (*chip_config)(struct bma180_data *data); |
| 43 | void (*chip_disable)(struct bma180_data *data); |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 44 | }; |
| 45 | |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 46 | /* Register set */ |
| 47 | #define BMA180_CHIP_ID 0x00 /* Need to distinguish BMA180 from other */ |
| 48 | #define BMA180_ACC_X_LSB 0x02 /* First of 6 registers of accel data */ |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 49 | #define BMA180_TEMP 0x08 |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 50 | #define BMA180_CTRL_REG0 0x0d |
| 51 | #define BMA180_RESET 0x10 |
| 52 | #define BMA180_BW_TCS 0x20 |
| 53 | #define BMA180_CTRL_REG3 0x21 |
| 54 | #define BMA180_TCO_Z 0x30 |
| 55 | #define BMA180_OFFSET_LSB1 0x35 |
| 56 | |
| 57 | /* BMA180_CTRL_REG0 bits */ |
| 58 | #define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */ |
| 59 | #define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */ |
| 60 | #define BMA180_EE_W BIT(4) /* Unlock writing to addr from 0x20 */ |
| 61 | #define BMA180_RESET_INT BIT(6) /* Reset pending interrupts */ |
| 62 | |
| 63 | /* BMA180_CTRL_REG3 bits */ |
| 64 | #define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */ |
| 65 | |
| 66 | /* BMA180_OFFSET_LSB1 skipping mode bit */ |
| 67 | #define BMA180_SMP_SKIP BIT(0) |
| 68 | |
| 69 | /* Bit masks for registers bit fields */ |
Peter Meerwald | cab767d | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 70 | #define BMA180_RANGE 0x0e /* Range of measured accel values */ |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 71 | #define BMA180_BW 0xf0 /* Accel bandwidth */ |
| 72 | #define BMA180_MODE_CONFIG 0x03 /* Config operation modes */ |
| 73 | |
| 74 | /* We have to write this value in reset register to do soft reset */ |
| 75 | #define BMA180_RESET_VAL 0xb6 |
| 76 | |
Peter Meerwald | 9a70b14 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 77 | #define BMA180_ID_REG_VAL 0x03 |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 78 | |
| 79 | /* Chip power modes */ |
| 80 | #define BMA180_LOW_NOISE 0x00 |
| 81 | #define BMA180_LOW_POWER 0x03 |
| 82 | |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 83 | /* Defaults values */ |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 84 | #define BMA180_DEF_PMODE false |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 85 | #define BMA180_DEF_BW 20 |
Peter Meerwald | 381676d | 2014-07-16 19:32:00 +0100 | [diff] [blame] | 86 | #define BMA180_DEF_SCALE 2452 |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 87 | |
| 88 | /* Available values for sysfs */ |
| 89 | #define BMA180_FLP_FREQ_AVAILABLE \ |
| 90 | "10 20 40 75 150 300" |
| 91 | #define BMA180_SCALE_AVAILABLE \ |
Peter Meerwald | 381676d | 2014-07-16 19:32:00 +0100 | [diff] [blame] | 92 | "0.001275 0.001863 0.002452 0.003727 0.004903 0.009709 0.019417" |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 93 | |
| 94 | struct bma180_data { |
| 95 | struct i2c_client *client; |
| 96 | struct iio_trigger *trig; |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 97 | const struct bma180_part_info *part_info; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 98 | struct mutex mutex; |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 99 | bool sleep_state; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 100 | int scale; |
| 101 | int bw; |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 102 | bool pmode; |
Peter Meerwald | b9a6a237 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 103 | u8 buff[16]; /* 3x 16-bit + 8-bit + padding + timestamp */ |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 104 | }; |
| 105 | |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 106 | enum bma180_chan { |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 107 | AXIS_X, |
| 108 | AXIS_Y, |
| 109 | AXIS_Z, |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 110 | TEMP |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 111 | }; |
| 112 | |
Peter Meerwald | cab767d | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 113 | static int bma180_bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */ |
| 114 | static int bma180_scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 }; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 115 | |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 116 | static int bma180_get_data_reg(struct bma180_data *data, enum bma180_chan chan) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 117 | { |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 118 | int ret; |
| 119 | |
| 120 | if (data->sleep_state) |
| 121 | return -EBUSY; |
| 122 | |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 123 | switch (chan) { |
| 124 | case TEMP: |
| 125 | ret = i2c_smbus_read_byte_data(data->client, BMA180_TEMP); |
| 126 | if (ret < 0) |
| 127 | dev_err(&data->client->dev, "failed to read temp register\n"); |
| 128 | break; |
| 129 | default: |
| 130 | ret = i2c_smbus_read_word_data(data->client, |
| 131 | BMA180_ACC_X_LSB + chan * 2); |
| 132 | if (ret < 0) |
| 133 | dev_err(&data->client->dev, |
| 134 | "failed to read accel_%c register\n", |
| 135 | 'x' + chan); |
| 136 | } |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 137 | |
| 138 | return ret; |
| 139 | } |
| 140 | |
| 141 | static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val) |
| 142 | { |
| 143 | int ret = i2c_smbus_read_byte_data(data->client, reg); |
| 144 | u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1)); |
| 145 | |
| 146 | if (ret < 0) |
| 147 | return ret; |
| 148 | |
| 149 | return i2c_smbus_write_byte_data(data->client, reg, reg_val); |
| 150 | } |
| 151 | |
| 152 | static int bma180_reset_intr(struct bma180_data *data) |
| 153 | { |
| 154 | int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT, 1); |
| 155 | |
| 156 | if (ret) |
| 157 | dev_err(&data->client->dev, "failed to reset interrupt\n"); |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 162 | static int bma180_set_new_data_intr_state(struct bma180_data *data, bool state) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 163 | { |
| 164 | u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00; |
| 165 | int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3, |
| 166 | reg_val); |
| 167 | |
| 168 | if (ret) |
| 169 | goto err; |
| 170 | ret = bma180_reset_intr(data); |
| 171 | if (ret) |
| 172 | goto err; |
| 173 | |
| 174 | return 0; |
| 175 | |
| 176 | err: |
| 177 | dev_err(&data->client->dev, |
| 178 | "failed to set new data interrupt state %d\n", state); |
| 179 | return ret; |
| 180 | } |
| 181 | |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 182 | static int bma180_set_sleep_state(struct bma180_data *data, bool state) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 183 | { |
| 184 | int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state); |
| 185 | |
| 186 | if (ret) { |
| 187 | dev_err(&data->client->dev, |
| 188 | "failed to set sleep state %d\n", state); |
| 189 | return ret; |
| 190 | } |
| 191 | data->sleep_state = state; |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 196 | static int bma180_set_ee_writing_state(struct bma180_data *data, bool state) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 197 | { |
| 198 | int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state); |
| 199 | |
| 200 | if (ret) |
| 201 | dev_err(&data->client->dev, |
| 202 | "failed to set ee writing state %d\n", state); |
| 203 | |
| 204 | return ret; |
| 205 | } |
| 206 | |
| 207 | static int bma180_set_bw(struct bma180_data *data, int val) |
| 208 | { |
| 209 | int ret, i; |
| 210 | |
| 211 | if (data->sleep_state) |
| 212 | return -EBUSY; |
| 213 | |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 214 | for (i = 0; i < data->part_info->num_bw; ++i) { |
| 215 | if (data->part_info->bw_table[i] == val) { |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 216 | ret = bma180_set_bits(data, |
| 217 | BMA180_BW_TCS, BMA180_BW, i); |
| 218 | if (ret) { |
| 219 | dev_err(&data->client->dev, |
| 220 | "failed to set bandwidth\n"); |
| 221 | return ret; |
| 222 | } |
| 223 | data->bw = val; |
| 224 | return 0; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | return -EINVAL; |
| 229 | } |
| 230 | |
| 231 | static int bma180_set_scale(struct bma180_data *data, int val) |
| 232 | { |
| 233 | int ret, i; |
| 234 | |
| 235 | if (data->sleep_state) |
| 236 | return -EBUSY; |
| 237 | |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 238 | for (i = 0; i < data->part_info->num_scales; ++i) |
| 239 | if (data->part_info->scale_table[i] == val) { |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 240 | ret = bma180_set_bits(data, |
| 241 | BMA180_OFFSET_LSB1, BMA180_RANGE, i); |
| 242 | if (ret) { |
| 243 | dev_err(&data->client->dev, |
| 244 | "failed to set scale\n"); |
| 245 | return ret; |
| 246 | } |
| 247 | data->scale = val; |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | return -EINVAL; |
| 252 | } |
| 253 | |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 254 | static int bma180_set_pmode(struct bma180_data *data, bool mode) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 255 | { |
| 256 | u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE; |
| 257 | int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG, |
| 258 | reg_val); |
| 259 | |
| 260 | if (ret) { |
| 261 | dev_err(&data->client->dev, "failed to set power mode\n"); |
| 262 | return ret; |
| 263 | } |
| 264 | data->pmode = mode; |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static int bma180_soft_reset(struct bma180_data *data) |
| 270 | { |
| 271 | int ret = i2c_smbus_write_byte_data(data->client, |
| 272 | BMA180_RESET, BMA180_RESET_VAL); |
| 273 | |
| 274 | if (ret) |
| 275 | dev_err(&data->client->dev, "failed to reset the chip\n"); |
| 276 | |
| 277 | return ret; |
| 278 | } |
| 279 | |
| 280 | static int bma180_chip_init(struct bma180_data *data) |
| 281 | { |
| 282 | /* Try to read chip_id register. It must return 0x03. */ |
| 283 | int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID); |
| 284 | |
| 285 | if (ret < 0) |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 286 | return ret; |
| 287 | if (ret != BMA180_ID_REG_VAL) |
| 288 | return -ENODEV; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 289 | |
| 290 | ret = bma180_soft_reset(data); |
| 291 | if (ret) |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 292 | return ret; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 293 | /* |
| 294 | * No serial transaction should occur within minimum 10 us |
| 295 | * after soft_reset command |
| 296 | */ |
| 297 | msleep(20); |
| 298 | |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | static int bma180_chip_config(struct bma180_data *data) |
| 303 | { |
| 304 | int ret = bma180_chip_init(data); |
| 305 | |
| 306 | if (ret) |
| 307 | goto err; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 308 | ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1); |
| 309 | if (ret) |
| 310 | goto err; |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 311 | ret = bma180_set_ee_writing_state(data, true); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 312 | if (ret) |
| 313 | goto err; |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 314 | ret = bma180_set_new_data_intr_state(data, false); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 315 | if (ret) |
| 316 | goto err; |
| 317 | ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1); |
| 318 | if (ret) |
| 319 | goto err; |
| 320 | ret = bma180_set_pmode(data, BMA180_DEF_PMODE); |
| 321 | if (ret) |
| 322 | goto err; |
| 323 | ret = bma180_set_bw(data, BMA180_DEF_BW); |
| 324 | if (ret) |
| 325 | goto err; |
| 326 | ret = bma180_set_scale(data, BMA180_DEF_SCALE); |
| 327 | if (ret) |
| 328 | goto err; |
| 329 | |
| 330 | return 0; |
| 331 | |
| 332 | err: |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 333 | dev_err(&data->client->dev, "failed to config the chip\n"); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 334 | return ret; |
| 335 | } |
| 336 | |
| 337 | static void bma180_chip_disable(struct bma180_data *data) |
| 338 | { |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 339 | if (bma180_set_new_data_intr_state(data, false)) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 340 | goto err; |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 341 | if (bma180_set_ee_writing_state(data, false)) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 342 | goto err; |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 343 | if (bma180_set_sleep_state(data, true)) |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 344 | goto err; |
| 345 | |
| 346 | return; |
| 347 | |
| 348 | err: |
| 349 | dev_err(&data->client->dev, "failed to disable the chip\n"); |
| 350 | } |
| 351 | |
| 352 | static IIO_CONST_ATTR(in_accel_filter_low_pass_3db_frequency_available, |
| 353 | BMA180_FLP_FREQ_AVAILABLE); |
| 354 | static IIO_CONST_ATTR(in_accel_scale_available, BMA180_SCALE_AVAILABLE); |
| 355 | |
| 356 | static struct attribute *bma180_attributes[] = { |
| 357 | &iio_const_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr, |
| 358 | &iio_const_attr_in_accel_scale_available.dev_attr.attr, |
| 359 | NULL, |
| 360 | }; |
| 361 | |
| 362 | static const struct attribute_group bma180_attrs_group = { |
| 363 | .attrs = bma180_attributes, |
| 364 | }; |
| 365 | |
| 366 | static int bma180_read_raw(struct iio_dev *indio_dev, |
| 367 | struct iio_chan_spec const *chan, int *val, int *val2, |
| 368 | long mask) |
| 369 | { |
| 370 | struct bma180_data *data = iio_priv(indio_dev); |
| 371 | int ret; |
| 372 | |
| 373 | switch (mask) { |
| 374 | case IIO_CHAN_INFO_RAW: |
| 375 | mutex_lock(&data->mutex); |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 376 | if (iio_buffer_enabled(indio_dev)) { |
| 377 | mutex_unlock(&data->mutex); |
| 378 | return -EBUSY; |
| 379 | } |
| 380 | ret = bma180_get_data_reg(data, chan->scan_index); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 381 | mutex_unlock(&data->mutex); |
| 382 | if (ret < 0) |
| 383 | return ret; |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 384 | *val = sign_extend32(ret >> chan->scan_type.shift, |
| 385 | chan->scan_type.realbits - 1); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 386 | return IIO_VAL_INT; |
| 387 | case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: |
| 388 | *val = data->bw; |
| 389 | return IIO_VAL_INT; |
| 390 | case IIO_CHAN_INFO_SCALE: |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 391 | switch (chan->type) { |
| 392 | case IIO_ACCEL: |
| 393 | *val = 0; |
| 394 | *val2 = data->scale; |
| 395 | return IIO_VAL_INT_PLUS_MICRO; |
| 396 | case IIO_TEMP: |
| 397 | *val = 500; |
| 398 | return IIO_VAL_INT; |
| 399 | default: |
| 400 | return -EINVAL; |
| 401 | } |
| 402 | case IIO_CHAN_INFO_OFFSET: |
| 403 | *val = 48; /* 0 LSB @ 24 degree C */ |
| 404 | return IIO_VAL_INT; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 405 | default: |
| 406 | return -EINVAL; |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | static int bma180_write_raw(struct iio_dev *indio_dev, |
| 411 | struct iio_chan_spec const *chan, int val, int val2, long mask) |
| 412 | { |
| 413 | struct bma180_data *data = iio_priv(indio_dev); |
| 414 | int ret; |
| 415 | |
| 416 | switch (mask) { |
| 417 | case IIO_CHAN_INFO_SCALE: |
| 418 | if (val) |
| 419 | return -EINVAL; |
| 420 | mutex_lock(&data->mutex); |
| 421 | ret = bma180_set_scale(data, val2); |
| 422 | mutex_unlock(&data->mutex); |
| 423 | return ret; |
| 424 | case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: |
Peter Meerwald | 9b2a4d3 | 2014-07-16 19:32:00 +0100 | [diff] [blame] | 425 | if (val2) |
| 426 | return -EINVAL; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 427 | mutex_lock(&data->mutex); |
| 428 | ret = bma180_set_bw(data, val); |
| 429 | mutex_unlock(&data->mutex); |
| 430 | return ret; |
| 431 | default: |
| 432 | return -EINVAL; |
| 433 | } |
| 434 | } |
| 435 | |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 436 | static const struct iio_info bma180_info = { |
| 437 | .attrs = &bma180_attrs_group, |
| 438 | .read_raw = bma180_read_raw, |
| 439 | .write_raw = bma180_write_raw, |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 440 | .driver_module = THIS_MODULE, |
| 441 | }; |
| 442 | |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 443 | static const char * const bma180_power_modes[] = { "low_noise", "low_power" }; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 444 | |
| 445 | static int bma180_get_power_mode(struct iio_dev *indio_dev, |
| 446 | const struct iio_chan_spec *chan) |
| 447 | { |
| 448 | struct bma180_data *data = iio_priv(indio_dev); |
| 449 | |
| 450 | return data->pmode; |
| 451 | } |
| 452 | |
| 453 | static int bma180_set_power_mode(struct iio_dev *indio_dev, |
| 454 | const struct iio_chan_spec *chan, unsigned int mode) |
| 455 | { |
| 456 | struct bma180_data *data = iio_priv(indio_dev); |
| 457 | int ret; |
| 458 | |
| 459 | mutex_lock(&data->mutex); |
| 460 | ret = bma180_set_pmode(data, mode); |
| 461 | mutex_unlock(&data->mutex); |
| 462 | |
| 463 | return ret; |
| 464 | } |
| 465 | |
| 466 | static const struct iio_enum bma180_power_mode_enum = { |
| 467 | .items = bma180_power_modes, |
| 468 | .num_items = ARRAY_SIZE(bma180_power_modes), |
| 469 | .get = bma180_get_power_mode, |
| 470 | .set = bma180_set_power_mode, |
| 471 | }; |
| 472 | |
| 473 | static const struct iio_chan_spec_ext_info bma180_ext_info[] = { |
| 474 | IIO_ENUM("power_mode", true, &bma180_power_mode_enum), |
| 475 | IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum), |
| 476 | { }, |
| 477 | }; |
| 478 | |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 479 | #define BMA180_ACC_CHANNEL(_axis) { \ |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 480 | .type = IIO_ACCEL, \ |
Peter Meerwald | 5585215 | 2014-10-01 21:37:00 +0100 | [diff] [blame] | 481 | .modified = 1, \ |
| 482 | .channel2 = IIO_MOD_##_axis, \ |
Peter Meerwald | 5c1449d | 2014-10-01 21:37:00 +0100 | [diff] [blame] | 483 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| 484 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 485 | BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \ |
Peter Meerwald | 5585215 | 2014-10-01 21:37:00 +0100 | [diff] [blame] | 486 | .scan_index = AXIS_##_axis, \ |
Jonathan Cameron | 7d7feae | 2013-12-11 18:45:00 +0000 | [diff] [blame] | 487 | .scan_type = { \ |
| 488 | .sign = 's', \ |
| 489 | .realbits = 14, \ |
| 490 | .storagebits = 16, \ |
| 491 | .shift = 2, \ |
| 492 | }, \ |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 493 | .ext_info = bma180_ext_info, \ |
| 494 | } |
| 495 | |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 496 | #define BMA180_TEMP_CHANNEL { \ |
| 497 | .type = IIO_TEMP, \ |
| 498 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
| 499 | BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET), \ |
| 500 | .scan_index = TEMP, \ |
| 501 | .scan_type = { \ |
| 502 | .sign = 's', \ |
| 503 | .realbits = 8, \ |
| 504 | .storagebits = 16, \ |
| 505 | }, \ |
| 506 | } |
| 507 | |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 508 | static const struct iio_chan_spec bma180_channels[] = { |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 509 | BMA180_ACC_CHANNEL(X), |
| 510 | BMA180_ACC_CHANNEL(Y), |
| 511 | BMA180_ACC_CHANNEL(Z), |
| 512 | BMA180_TEMP_CHANNEL, |
| 513 | IIO_CHAN_SOFT_TIMESTAMP(4), |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 514 | }; |
| 515 | |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 516 | static const struct bma180_part_info bma180_part_info[] = { |
| 517 | [BMA180] = { |
| 518 | bma180_channels, ARRAY_SIZE(bma180_channels), |
| 519 | bma180_scale_table, ARRAY_SIZE(bma180_scale_table), |
| 520 | bma180_bw_table, ARRAY_SIZE(bma180_bw_table), |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 521 | bma180_chip_config, |
| 522 | bma180_chip_disable, |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 523 | }, |
| 524 | }; |
| 525 | |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 526 | static irqreturn_t bma180_trigger_handler(int irq, void *p) |
| 527 | { |
| 528 | struct iio_poll_func *pf = p; |
| 529 | struct iio_dev *indio_dev = pf->indio_dev; |
| 530 | struct bma180_data *data = iio_priv(indio_dev); |
Lars-Peter Clausen | 6bf9d877 | 2013-09-19 13:59:00 +0100 | [diff] [blame] | 531 | int64_t time_ns = iio_get_time_ns(); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 532 | int bit, ret, i = 0; |
| 533 | |
| 534 | mutex_lock(&data->mutex); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 535 | |
| 536 | for_each_set_bit(bit, indio_dev->buffer->scan_mask, |
| 537 | indio_dev->masklength) { |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 538 | ret = bma180_get_data_reg(data, bit); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 539 | if (ret < 0) { |
| 540 | mutex_unlock(&data->mutex); |
| 541 | goto err; |
| 542 | } |
| 543 | ((s16 *)data->buff)[i++] = ret; |
| 544 | } |
Peter Meerwald | b81fbab | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 545 | |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 546 | mutex_unlock(&data->mutex); |
| 547 | |
Lars-Peter Clausen | 6bf9d877 | 2013-09-19 13:59:00 +0100 | [diff] [blame] | 548 | iio_push_to_buffers_with_timestamp(indio_dev, data->buff, time_ns); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 549 | err: |
| 550 | iio_trigger_notify_done(indio_dev->trig); |
| 551 | |
| 552 | return IRQ_HANDLED; |
| 553 | } |
| 554 | |
| 555 | static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig, |
| 556 | bool state) |
| 557 | { |
| 558 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| 559 | struct bma180_data *data = iio_priv(indio_dev); |
| 560 | |
| 561 | return bma180_set_new_data_intr_state(data, state); |
| 562 | } |
| 563 | |
| 564 | static int bma180_trig_try_reen(struct iio_trigger *trig) |
| 565 | { |
| 566 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| 567 | struct bma180_data *data = iio_priv(indio_dev); |
| 568 | |
| 569 | return bma180_reset_intr(data); |
| 570 | } |
| 571 | |
| 572 | static const struct iio_trigger_ops bma180_trigger_ops = { |
| 573 | .set_trigger_state = bma180_data_rdy_trigger_set_state, |
| 574 | .try_reenable = bma180_trig_try_reen, |
| 575 | .owner = THIS_MODULE, |
| 576 | }; |
| 577 | |
| 578 | static int bma180_probe(struct i2c_client *client, |
| 579 | const struct i2c_device_id *id) |
| 580 | { |
| 581 | struct bma180_data *data; |
| 582 | struct iio_dev *indio_dev; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 583 | int ret; |
| 584 | |
| 585 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
| 586 | if (!indio_dev) |
| 587 | return -ENOMEM; |
| 588 | |
| 589 | data = iio_priv(indio_dev); |
| 590 | i2c_set_clientdata(client, indio_dev); |
| 591 | data->client = client; |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 592 | data->part_info = &bma180_part_info[id->driver_data]; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 593 | |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 594 | ret = data->part_info->chip_config(data); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 595 | if (ret < 0) |
| 596 | goto err_chip_disable; |
| 597 | |
| 598 | mutex_init(&data->mutex); |
| 599 | |
| 600 | indio_dev->dev.parent = &client->dev; |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 601 | indio_dev->channels = data->part_info->channels; |
| 602 | indio_dev->num_channels = data->part_info->num_channels; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 603 | indio_dev->name = BMA180_DRV_NAME; |
| 604 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 605 | indio_dev->info = &bma180_info; |
| 606 | |
Peter Meerwald | 16ed869 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 607 | if (client->irq > 0) { |
| 608 | data->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, |
| 609 | indio_dev->id); |
| 610 | if (!data->trig) { |
| 611 | ret = -ENOMEM; |
| 612 | goto err_chip_disable; |
| 613 | } |
| 614 | |
| 615 | ret = devm_request_irq(&client->dev, client->irq, |
| 616 | iio_trigger_generic_data_rdy_poll, IRQF_TRIGGER_RISING, |
| 617 | BMA180_IRQ_NAME, data->trig); |
| 618 | if (ret) { |
| 619 | dev_err(&client->dev, "unable to request IRQ\n"); |
| 620 | goto err_trigger_free; |
| 621 | } |
| 622 | |
| 623 | data->trig->dev.parent = &client->dev; |
| 624 | data->trig->ops = &bma180_trigger_ops; |
| 625 | iio_trigger_set_drvdata(data->trig, indio_dev); |
| 626 | indio_dev->trig = data->trig; |
| 627 | |
| 628 | ret = iio_trigger_register(data->trig); |
| 629 | if (ret) |
| 630 | goto err_trigger_free; |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 631 | } |
| 632 | |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 633 | ret = iio_triggered_buffer_setup(indio_dev, NULL, |
| 634 | bma180_trigger_handler, NULL); |
| 635 | if (ret < 0) { |
| 636 | dev_err(&client->dev, "unable to setup iio triggered buffer\n"); |
| 637 | goto err_trigger_unregister; |
| 638 | } |
| 639 | |
| 640 | ret = iio_device_register(indio_dev); |
| 641 | if (ret < 0) { |
| 642 | dev_err(&client->dev, "unable to register iio device\n"); |
| 643 | goto err_buffer_cleanup; |
| 644 | } |
| 645 | |
| 646 | return 0; |
| 647 | |
| 648 | err_buffer_cleanup: |
| 649 | iio_triggered_buffer_cleanup(indio_dev); |
| 650 | err_trigger_unregister: |
Peter Meerwald | 16ed869 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 651 | if (data->trig) |
| 652 | iio_trigger_unregister(data->trig); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 653 | err_trigger_free: |
Peter Meerwald | 16ed869 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 654 | iio_trigger_free(data->trig); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 655 | err_chip_disable: |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 656 | data->part_info->chip_disable(data); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 657 | |
| 658 | return ret; |
| 659 | } |
| 660 | |
| 661 | static int bma180_remove(struct i2c_client *client) |
| 662 | { |
| 663 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
| 664 | struct bma180_data *data = iio_priv(indio_dev); |
| 665 | |
| 666 | iio_device_unregister(indio_dev); |
| 667 | iio_triggered_buffer_cleanup(indio_dev); |
Peter Meerwald | 16ed869 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 668 | if (data->trig) { |
| 669 | iio_trigger_unregister(data->trig); |
| 670 | iio_trigger_free(data->trig); |
| 671 | } |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 672 | |
| 673 | mutex_lock(&data->mutex); |
Peter Meerwald | c1949ec | 2014-08-19 23:43:00 +0100 | [diff] [blame^] | 674 | data->part_info->chip_disable(data); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 675 | mutex_unlock(&data->mutex); |
| 676 | |
| 677 | return 0; |
| 678 | } |
| 679 | |
| 680 | #ifdef CONFIG_PM_SLEEP |
| 681 | static int bma180_suspend(struct device *dev) |
| 682 | { |
Peter Meerwald | 234efa1 | 2013-09-18 22:47:00 +0100 | [diff] [blame] | 683 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 684 | struct bma180_data *data = iio_priv(indio_dev); |
| 685 | int ret; |
| 686 | |
| 687 | mutex_lock(&data->mutex); |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 688 | ret = bma180_set_sleep_state(data, true); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 689 | mutex_unlock(&data->mutex); |
| 690 | |
| 691 | return ret; |
| 692 | } |
| 693 | |
| 694 | static int bma180_resume(struct device *dev) |
| 695 | { |
Peter Meerwald | 234efa1 | 2013-09-18 22:47:00 +0100 | [diff] [blame] | 696 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 697 | struct bma180_data *data = iio_priv(indio_dev); |
| 698 | int ret; |
| 699 | |
| 700 | mutex_lock(&data->mutex); |
Peter Meerwald | c7c69e8 | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 701 | ret = bma180_set_sleep_state(data, false); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 702 | mutex_unlock(&data->mutex); |
| 703 | |
| 704 | return ret; |
| 705 | } |
| 706 | |
| 707 | static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume); |
| 708 | #define BMA180_PM_OPS (&bma180_pm_ops) |
| 709 | #else |
| 710 | #define BMA180_PM_OPS NULL |
| 711 | #endif |
| 712 | |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 713 | static struct i2c_device_id bma180_ids[] = { |
| 714 | { BMA180_DRV_NAME, BMA180 }, |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 715 | { } |
| 716 | }; |
| 717 | |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 718 | MODULE_DEVICE_TABLE(i2c, bma180_ids); |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 719 | |
| 720 | static struct i2c_driver bma180_driver = { |
| 721 | .driver = { |
| 722 | .name = BMA180_DRV_NAME, |
| 723 | .owner = THIS_MODULE, |
| 724 | .pm = BMA180_PM_OPS, |
| 725 | }, |
| 726 | .probe = bma180_probe, |
| 727 | .remove = bma180_remove, |
Peter Meerwald | 1b9030f | 2014-08-19 23:43:00 +0100 | [diff] [blame] | 728 | .id_table = bma180_ids, |
Oleksandr Kravchenko | fdadbce | 2013-08-28 12:01:00 +0100 | [diff] [blame] | 729 | }; |
| 730 | |
| 731 | module_i2c_driver(bma180_driver); |
| 732 | |
| 733 | MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>"); |
| 734 | MODULE_AUTHOR("Texas Instruments, Inc."); |
| 735 | MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor"); |
| 736 | MODULE_LICENSE("GPL"); |