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Commit | Line | Data |
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6cf23dff CO |
1 | /* |
2 | * Device driver for the the HMC5843 multi-chip module designed | |
3 | * for low field magnetic sensing. | |
4 | * | |
5 | * Copyright (C) 2010 Texas Instruments | |
6 | * | |
7 | * Author: Shubhrajyoti Datta <shubhrajyoti@ti.com> | |
8 | * Acknowledgment: Jonathan Cameron <jic23@kernel.org> for valuable inputs. | |
9 | * Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@pmeerw.net>. | |
10 | * Split to multiple files by Josef Gajdusek <atx@atx.name> - 2014 | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | */ | |
b4e17822 S |
23 | |
24 | #include <linux/module.h> | |
f326a525 | 25 | #include <linux/regmap.h> |
06458e27 JC |
26 | #include <linux/iio/iio.h> |
27 | #include <linux/iio/sysfs.h> | |
cb9b9a82 PM |
28 | #include <linux/iio/trigger_consumer.h> |
29 | #include <linux/iio/buffer.h> | |
30 | #include <linux/iio/triggered_buffer.h> | |
4dedf31c | 31 | #include <linux/delay.h> |
b4e17822 | 32 | |
fc35a91b | 33 | #include "hmc5843.h" |
16b91a40 | 34 | |
b4e17822 | 35 | /* |
16b91a40 PM |
36 | * Range gain settings in (+-)Ga |
37 | * Beware: HMC5843 and HMC5883 have different recommended sensor field | |
38 | * ranges; default corresponds to +-1.0 Ga and +-1.3 Ga, respectively | |
39 | */ | |
40 | #define HMC5843_RANGE_GAIN_OFFSET 0x05 | |
41 | #define HMC5843_RANGE_GAIN_DEFAULT 0x01 | |
f326a525 | 42 | #define HMC5843_RANGE_GAIN_MASK 0xe0 |
b4e17822 | 43 | |
9728fe3f | 44 | /* Device status */ |
16b91a40 PM |
45 | #define HMC5843_DATA_READY 0x01 |
46 | #define HMC5843_DATA_OUTPUT_LOCK 0x02 | |
b4e17822 | 47 | |
9728fe3f | 48 | /* Mode register configuration */ |
16b91a40 PM |
49 | #define HMC5843_MODE_CONVERSION_CONTINUOUS 0x00 |
50 | #define HMC5843_MODE_CONVERSION_SINGLE 0x01 | |
51 | #define HMC5843_MODE_IDLE 0x02 | |
52 | #define HMC5843_MODE_SLEEP 0x03 | |
53 | #define HMC5843_MODE_MASK 0x03 | |
54 | ||
55 | /* | |
56 | * HMC5843: Minimum data output rate | |
57 | * HMC5883: Typical data output rate | |
58 | */ | |
59 | #define HMC5843_RATE_OFFSET 0x02 | |
8e2e2971 | 60 | #define HMC5843_RATE_DEFAULT 0x04 |
f326a525 | 61 | #define HMC5843_RATE_MASK 0x1c |
b4e17822 | 62 | |
9728fe3f | 63 | /* Device measurement configuration */ |
16b91a40 PM |
64 | #define HMC5843_MEAS_CONF_NORMAL 0x00 |
65 | #define HMC5843_MEAS_CONF_POSITIVE_BIAS 0x01 | |
66 | #define HMC5843_MEAS_CONF_NEGATIVE_BIAS 0x02 | |
16b91a40 | 67 | #define HMC5843_MEAS_CONF_MASK 0x03 |
b4e17822 | 68 | |
9728fe3f | 69 | /* Scaling factors: 10000000/Gain */ |
585f7ce2 | 70 | static const int hmc5843_regval_to_nanoscale[] = { |
494c6b15 | 71 | 6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714 |
b4e17822 | 72 | }; |
494c6b15 | 73 | |
585f7ce2 | 74 | static const int hmc5883_regval_to_nanoscale[] = { |
357fcff5 PM |
75 | 7812, 9766, 13021, 16287, 24096, 27701, 32573, 45662 |
76 | }; | |
77 | ||
585f7ce2 | 78 | static const int hmc5883l_regval_to_nanoscale[] = { |
357fcff5 PM |
79 | 7299, 9174, 12195, 15152, 22727, 25641, 30303, 43478 |
80 | }; | |
81 | ||
c7c34af0 PM |
82 | /* |
83 | * From the datasheet: | |
357fcff5 PM |
84 | * Value | HMC5843 | HMC5883/HMC5883L |
85 | * | Data output rate (Hz) | Data output rate (Hz) | |
86 | * 0 | 0.5 | 0.75 | |
87 | * 1 | 1 | 1.5 | |
88 | * 2 | 2 | 3 | |
89 | * 3 | 5 | 7.5 | |
90 | * 4 | 10 (default) | 15 | |
91 | * 5 | 20 | 30 | |
92 | * 6 | 50 | 75 | |
93 | * 7 | Not used | Not used | |
c7c34af0 | 94 | */ |
585f7ce2 | 95 | static const int hmc5843_regval_to_samp_freq[][2] = { |
d4dc0a34 | 96 | {0, 500000}, {1, 0}, {2, 0}, {5, 0}, {10, 0}, {20, 0}, {50, 0} |
357fcff5 PM |
97 | }; |
98 | ||
585f7ce2 | 99 | static const int hmc5883_regval_to_samp_freq[][2] = { |
d4dc0a34 PM |
100 | {0, 750000}, {1, 500000}, {3, 0}, {7, 500000}, {15, 0}, {30, 0}, |
101 | {75, 0} | |
b4e17822 S |
102 | }; |
103 | ||
5a059bd2 JG |
104 | static const int hmc5983_regval_to_samp_freq[][2] = { |
105 | {0, 750000}, {1, 500000}, {3, 0}, {7, 500000}, {15, 0}, {30, 0}, | |
106 | {75, 0}, {220, 0} | |
107 | }; | |
108 | ||
357fcff5 PM |
109 | /* Describe chip variants */ |
110 | struct hmc5843_chip_info { | |
111 | const struct iio_chan_spec *channels; | |
d4dc0a34 | 112 | const int (*regval_to_samp_freq)[2]; |
585f7ce2 | 113 | const int n_regval_to_samp_freq; |
357fcff5 | 114 | const int *regval_to_nanoscale; |
585f7ce2 | 115 | const int n_regval_to_nanoscale; |
357fcff5 PM |
116 | }; |
117 | ||
c7c34af0 | 118 | /* The lower two bits contain the current conversion mode */ |
62248758 | 119 | static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode) |
b4e17822 | 120 | { |
62248758 PM |
121 | int ret; |
122 | ||
123 | mutex_lock(&data->lock); | |
f326a525 | 124 | ret = regmap_update_bits(data->regmap, HMC5843_MODE_REG, |
7079f21b | 125 | HMC5843_MODE_MASK, operating_mode); |
62248758 PM |
126 | mutex_unlock(&data->lock); |
127 | ||
128 | return ret; | |
b4e17822 S |
129 | } |
130 | ||
39c18828 | 131 | static int hmc5843_wait_measurement(struct hmc5843_data *data) |
b4e17822 | 132 | { |
4dedf31c | 133 | int tries = 150; |
883fc268 | 134 | unsigned int val; |
f326a525 | 135 | int ret; |
b4e17822 | 136 | |
4dedf31c | 137 | while (tries-- > 0) { |
f326a525 JG |
138 | ret = regmap_read(data->regmap, HMC5843_STATUS_REG, &val); |
139 | if (ret < 0) | |
140 | return ret; | |
141 | if (val & HMC5843_DATA_READY) | |
4dedf31c PM |
142 | break; |
143 | msleep(20); | |
144 | } | |
145 | ||
146 | if (tries < 0) { | |
fc35a91b | 147 | dev_err(data->dev, "data not ready\n"); |
4dedf31c PM |
148 | return -EIO; |
149 | } | |
b4e17822 | 150 | |
39c18828 PM |
151 | return 0; |
152 | } | |
153 | ||
154 | /* Return the measurement value from the specified channel */ | |
155 | static int hmc5843_read_measurement(struct hmc5843_data *data, | |
156 | int idx, int *val) | |
157 | { | |
39c18828 | 158 | __be16 values[3]; |
f326a525 | 159 | int ret; |
39c18828 PM |
160 | |
161 | mutex_lock(&data->lock); | |
f326a525 JG |
162 | ret = hmc5843_wait_measurement(data); |
163 | if (ret < 0) { | |
39c18828 | 164 | mutex_unlock(&data->lock); |
f326a525 | 165 | return ret; |
39c18828 | 166 | } |
f326a525 | 167 | ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS, |
7079f21b | 168 | values, sizeof(values)); |
b4e17822 | 169 | mutex_unlock(&data->lock); |
f326a525 JG |
170 | if (ret < 0) |
171 | return ret; | |
b4e17822 | 172 | |
39c18828 | 173 | *val = sign_extend32(be16_to_cpu(values[idx]), 15); |
494c6b15 | 174 | return IIO_VAL_INT; |
b4e17822 | 175 | } |
494c6b15 | 176 | |
b4e17822 S |
177 | /* |
178 | * API for setting the measurement configuration to | |
179 | * Normal, Positive bias and Negative bias | |
b4e17822 | 180 | * |
c7c34af0 PM |
181 | * From the datasheet: |
182 | * 0 - Normal measurement configuration (default): In normal measurement | |
183 | * configuration the device follows normal measurement flow. Pins BP | |
184 | * and BN are left floating and high impedance. | |
b4e17822 | 185 | * |
c7c34af0 PM |
186 | * 1 - Positive bias configuration: In positive bias configuration, a |
187 | * positive current is forced across the resistive load on pins BP | |
188 | * and BN. | |
b4e17822 | 189 | * |
c7c34af0 PM |
190 | * 2 - Negative bias configuration. In negative bias configuration, a |
191 | * negative current is forced across the resistive load on pins BP | |
192 | * and BN. | |
b4e17822 S |
193 | * |
194 | */ | |
f326a525 | 195 | static int hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf) |
b4e17822 | 196 | { |
4f1ca415 PM |
197 | int ret; |
198 | ||
199 | mutex_lock(&data->lock); | |
f326a525 | 200 | ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A, |
7079f21b | 201 | HMC5843_MEAS_CONF_MASK, meas_conf); |
4f1ca415 PM |
202 | mutex_unlock(&data->lock); |
203 | ||
204 | return ret; | |
b4e17822 S |
205 | } |
206 | ||
7079f21b CO |
207 | static |
208 | ssize_t hmc5843_show_measurement_configuration(struct device *dev, | |
209 | struct device_attribute *attr, | |
210 | char *buf) | |
b4e17822 | 211 | { |
4f1ca415 | 212 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
883fc268 | 213 | unsigned int val; |
f326a525 JG |
214 | int ret; |
215 | ||
216 | ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &val); | |
217 | if (ret) | |
218 | return ret; | |
219 | val &= HMC5843_MEAS_CONF_MASK; | |
220 | ||
221 | return sprintf(buf, "%d\n", val); | |
b4e17822 S |
222 | } |
223 | ||
7079f21b CO |
224 | static |
225 | ssize_t hmc5843_set_measurement_configuration(struct device *dev, | |
226 | struct device_attribute *attr, | |
227 | const char *buf, | |
228 | size_t count) | |
b4e17822 | 229 | { |
4f1ca415 | 230 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
b4e17822 | 231 | unsigned long meas_conf = 0; |
4f1ca415 | 232 | int ret; |
e278df1c | 233 | |
4f1ca415 PM |
234 | ret = kstrtoul(buf, 10, &meas_conf); |
235 | if (ret) | |
236 | return ret; | |
237 | if (meas_conf >= HMC5843_MEAS_CONF_MASK) | |
e278df1c PM |
238 | return -EINVAL; |
239 | ||
4f1ca415 | 240 | ret = hmc5843_set_meas_conf(data, meas_conf); |
b4e17822 | 241 | |
4f1ca415 | 242 | return (ret < 0) ? ret : count; |
b4e17822 | 243 | } |
c7c34af0 | 244 | |
b4e17822 S |
245 | static IIO_DEVICE_ATTR(meas_conf, |
246 | S_IWUSR | S_IRUGO, | |
247 | hmc5843_show_measurement_configuration, | |
248 | hmc5843_set_measurement_configuration, | |
249 | 0); | |
250 | ||
7079f21b CO |
251 | static |
252 | ssize_t hmc5843_show_samp_freq_avail(struct device *dev, | |
253 | struct device_attribute *attr, char *buf) | |
357fcff5 | 254 | { |
9a3b2d5e | 255 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
dd28e482 | 256 | size_t len = 0; |
357fcff5 PM |
257 | int i; |
258 | ||
585f7ce2 | 259 | for (i = 0; i < data->variant->n_regval_to_samp_freq; i++) |
dd28e482 | 260 | len += scnprintf(buf + len, PAGE_SIZE - len, |
9a3b2d5e PM |
261 | "%d.%d ", data->variant->regval_to_samp_freq[i][0], |
262 | data->variant->regval_to_samp_freq[i][1]); | |
dd28e482 | 263 | |
357fcff5 | 264 | /* replace trailing space by newline */ |
dd28e482 PM |
265 | buf[len - 1] = '\n'; |
266 | ||
267 | return len; | |
268 | } | |
357fcff5 | 269 | |
d4dc0a34 | 270 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_samp_freq_avail); |
b4e17822 | 271 | |
ca4c6172 | 272 | static int hmc5843_set_samp_freq(struct hmc5843_data *data, u8 rate) |
b4e17822 | 273 | { |
ca4c6172 PM |
274 | int ret; |
275 | ||
276 | mutex_lock(&data->lock); | |
f326a525 | 277 | ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A, |
7079f21b CO |
278 | HMC5843_RATE_MASK, |
279 | rate << HMC5843_RATE_OFFSET); | |
ca4c6172 | 280 | mutex_unlock(&data->lock); |
4fd4d7d8 | 281 | |
ca4c6172 | 282 | return ret; |
b4e17822 S |
283 | } |
284 | ||
9a3b2d5e | 285 | static int hmc5843_get_samp_freq_index(struct hmc5843_data *data, |
7079f21b | 286 | int val, int val2) |
13f6eb69 | 287 | { |
9a3b2d5e PM |
288 | int i; |
289 | ||
585f7ce2 | 290 | for (i = 0; i < data->variant->n_regval_to_samp_freq; i++) |
9a3b2d5e | 291 | if (val == data->variant->regval_to_samp_freq[i][0] && |
7079f21b | 292 | val2 == data->variant->regval_to_samp_freq[i][1]) |
9a3b2d5e PM |
293 | return i; |
294 | ||
295 | return -EINVAL; | |
13f6eb69 PM |
296 | } |
297 | ||
f3f75519 PM |
298 | static int hmc5843_set_range_gain(struct hmc5843_data *data, u8 range) |
299 | { | |
300 | int ret; | |
301 | ||
302 | mutex_lock(&data->lock); | |
f326a525 | 303 | ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_B, |
7079f21b CO |
304 | HMC5843_RANGE_GAIN_MASK, |
305 | range << HMC5843_RANGE_GAIN_OFFSET); | |
f3f75519 PM |
306 | mutex_unlock(&data->lock); |
307 | ||
308 | return ret; | |
309 | } | |
310 | ||
ae6f54d2 | 311 | static ssize_t hmc5843_show_scale_avail(struct device *dev, |
7079f21b CO |
312 | struct device_attribute *attr, |
313 | char *buf) | |
b4e17822 | 314 | { |
ae6f54d2 PM |
315 | struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev)); |
316 | ||
317 | size_t len = 0; | |
318 | int i; | |
b4e17822 | 319 | |
585f7ce2 | 320 | for (i = 0; i < data->variant->n_regval_to_nanoscale; i++) |
ae6f54d2 PM |
321 | len += scnprintf(buf + len, PAGE_SIZE - len, |
322 | "0.%09d ", data->variant->regval_to_nanoscale[i]); | |
323 | ||
324 | /* replace trailing space by newline */ | |
325 | buf[len - 1] = '\n'; | |
326 | ||
327 | return len; | |
b4e17822 S |
328 | } |
329 | ||
ae6f54d2 PM |
330 | static IIO_DEVICE_ATTR(scale_available, S_IRUGO, |
331 | hmc5843_show_scale_avail, NULL, 0); | |
c7c34af0 | 332 | |
ae6f54d2 PM |
333 | static int hmc5843_get_scale_index(struct hmc5843_data *data, int val, int val2) |
334 | { | |
335 | int i; | |
b4e17822 | 336 | |
ae6f54d2 PM |
337 | if (val != 0) |
338 | return -EINVAL; | |
b4e17822 | 339 | |
585f7ce2 | 340 | for (i = 0; i < data->variant->n_regval_to_nanoscale; i++) |
ae6f54d2 PM |
341 | if (val2 == data->variant->regval_to_nanoscale[i]) |
342 | return i; | |
b4e17822 | 343 | |
ae6f54d2 | 344 | return -EINVAL; |
b4e17822 | 345 | } |
c7c34af0 | 346 | |
494c6b15 JC |
347 | static int hmc5843_read_raw(struct iio_dev *indio_dev, |
348 | struct iio_chan_spec const *chan, | |
d4dc0a34 | 349 | int *val, int *val2, long mask) |
b4e17822 | 350 | { |
88fa4de4 | 351 | struct hmc5843_data *data = iio_priv(indio_dev); |
883fc268 | 352 | unsigned int rval; |
f326a525 | 353 | int ret; |
494c6b15 JC |
354 | |
355 | switch (mask) { | |
4d9948b3 | 356 | case IIO_CHAN_INFO_RAW: |
cb9b9a82 | 357 | return hmc5843_read_measurement(data, chan->scan_index, val); |
c8a9f805 | 358 | case IIO_CHAN_INFO_SCALE: |
f326a525 JG |
359 | ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_B, &rval); |
360 | if (ret < 0) | |
361 | return ret; | |
362 | rval >>= HMC5843_RANGE_GAIN_OFFSET; | |
494c6b15 | 363 | *val = 0; |
f326a525 | 364 | *val2 = data->variant->regval_to_nanoscale[rval]; |
494c6b15 | 365 | return IIO_VAL_INT_PLUS_NANO; |
d4dc0a34 | 366 | case IIO_CHAN_INFO_SAMP_FREQ: |
f326a525 JG |
367 | ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &rval); |
368 | if (ret < 0) | |
369 | return ret; | |
370 | rval >>= HMC5843_RATE_OFFSET; | |
371 | *val = data->variant->regval_to_samp_freq[rval][0]; | |
372 | *val2 = data->variant->regval_to_samp_freq[rval][1]; | |
d4dc0a34 | 373 | return IIO_VAL_INT_PLUS_MICRO; |
73327b4c | 374 | } |
494c6b15 | 375 | return -EINVAL; |
b4e17822 | 376 | } |
494c6b15 | 377 | |
d4dc0a34 PM |
378 | static int hmc5843_write_raw(struct iio_dev *indio_dev, |
379 | struct iio_chan_spec const *chan, | |
380 | int val, int val2, long mask) | |
381 | { | |
382 | struct hmc5843_data *data = iio_priv(indio_dev); | |
f3f75519 | 383 | int rate, range; |
d4dc0a34 PM |
384 | |
385 | switch (mask) { | |
386 | case IIO_CHAN_INFO_SAMP_FREQ: | |
9a3b2d5e | 387 | rate = hmc5843_get_samp_freq_index(data, val, val2); |
d4dc0a34 PM |
388 | if (rate < 0) |
389 | return -EINVAL; | |
390 | ||
ca4c6172 | 391 | return hmc5843_set_samp_freq(data, rate); |
ae6f54d2 PM |
392 | case IIO_CHAN_INFO_SCALE: |
393 | range = hmc5843_get_scale_index(data, val, val2); | |
394 | if (range < 0) | |
395 | return -EINVAL; | |
396 | ||
f3f75519 | 397 | return hmc5843_set_range_gain(data, range); |
ae6f54d2 PM |
398 | default: |
399 | return -EINVAL; | |
400 | } | |
401 | } | |
402 | ||
403 | static int hmc5843_write_raw_get_fmt(struct iio_dev *indio_dev, | |
7079f21b CO |
404 | struct iio_chan_spec const *chan, |
405 | long mask) | |
ae6f54d2 PM |
406 | { |
407 | switch (mask) { | |
408 | case IIO_CHAN_INFO_SAMP_FREQ: | |
409 | return IIO_VAL_INT_PLUS_MICRO; | |
410 | case IIO_CHAN_INFO_SCALE: | |
411 | return IIO_VAL_INT_PLUS_NANO; | |
d4dc0a34 PM |
412 | default: |
413 | return -EINVAL; | |
414 | } | |
415 | } | |
416 | ||
cb9b9a82 PM |
417 | static irqreturn_t hmc5843_trigger_handler(int irq, void *p) |
418 | { | |
419 | struct iio_poll_func *pf = p; | |
420 | struct iio_dev *indio_dev = pf->indio_dev; | |
421 | struct hmc5843_data *data = iio_priv(indio_dev); | |
422 | int ret; | |
423 | ||
424 | mutex_lock(&data->lock); | |
425 | ret = hmc5843_wait_measurement(data); | |
426 | if (ret < 0) { | |
427 | mutex_unlock(&data->lock); | |
428 | goto done; | |
429 | } | |
430 | ||
f326a525 | 431 | ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS, |
7079f21b | 432 | data->buffer, 3 * sizeof(__be16)); |
f326a525 | 433 | |
cb9b9a82 PM |
434 | mutex_unlock(&data->lock); |
435 | if (ret < 0) | |
436 | goto done; | |
437 | ||
438 | iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, | |
7079f21b | 439 | iio_get_time_ns()); |
cb9b9a82 PM |
440 | |
441 | done: | |
442 | iio_trigger_notify_done(indio_dev->trig); | |
443 | ||
444 | return IRQ_HANDLED; | |
445 | } | |
446 | ||
39c18828 | 447 | #define HMC5843_CHANNEL(axis, idx) \ |
494c6b15 JC |
448 | { \ |
449 | .type = IIO_MAGN, \ | |
450 | .modified = 1, \ | |
451 | .channel2 = IIO_MOD_##axis, \ | |
b3700970 | 452 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
d4dc0a34 PM |
453 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ |
454 | BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
cb9b9a82 | 455 | .scan_index = idx, \ |
c5fe7a41 JC |
456 | .scan_type = { \ |
457 | .sign = 's', \ | |
458 | .realbits = 16, \ | |
459 | .storagebits = 16, \ | |
460 | .endianness = IIO_BE, \ | |
461 | }, \ | |
494c6b15 JC |
462 | } |
463 | ||
464 | static const struct iio_chan_spec hmc5843_channels[] = { | |
39c18828 PM |
465 | HMC5843_CHANNEL(X, 0), |
466 | HMC5843_CHANNEL(Y, 1), | |
467 | HMC5843_CHANNEL(Z, 2), | |
cb9b9a82 | 468 | IIO_CHAN_SOFT_TIMESTAMP(3), |
494c6b15 | 469 | }; |
b4e17822 | 470 | |
5a059bd2 | 471 | /* Beware: Y and Z are exchanged on HMC5883 and 5983 */ |
357fcff5 | 472 | static const struct iio_chan_spec hmc5883_channels[] = { |
39c18828 PM |
473 | HMC5843_CHANNEL(X, 0), |
474 | HMC5843_CHANNEL(Z, 1), | |
475 | HMC5843_CHANNEL(Y, 2), | |
cb9b9a82 | 476 | IIO_CHAN_SOFT_TIMESTAMP(3), |
357fcff5 PM |
477 | }; |
478 | ||
b4e17822 S |
479 | static struct attribute *hmc5843_attributes[] = { |
480 | &iio_dev_attr_meas_conf.dev_attr.attr, | |
ae6f54d2 | 481 | &iio_dev_attr_scale_available.dev_attr.attr, |
357fcff5 | 482 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
b4e17822 S |
483 | NULL |
484 | }; | |
485 | ||
486 | static const struct attribute_group hmc5843_group = { | |
487 | .attrs = hmc5843_attributes, | |
488 | }; | |
489 | ||
357fcff5 PM |
490 | static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = { |
491 | [HMC5843_ID] = { | |
492 | .channels = hmc5843_channels, | |
d4dc0a34 | 493 | .regval_to_samp_freq = hmc5843_regval_to_samp_freq, |
585f7ce2 JG |
494 | .n_regval_to_samp_freq = |
495 | ARRAY_SIZE(hmc5843_regval_to_samp_freq), | |
357fcff5 | 496 | .regval_to_nanoscale = hmc5843_regval_to_nanoscale, |
585f7ce2 JG |
497 | .n_regval_to_nanoscale = |
498 | ARRAY_SIZE(hmc5843_regval_to_nanoscale), | |
357fcff5 PM |
499 | }, |
500 | [HMC5883_ID] = { | |
501 | .channels = hmc5883_channels, | |
d4dc0a34 | 502 | .regval_to_samp_freq = hmc5883_regval_to_samp_freq, |
585f7ce2 JG |
503 | .n_regval_to_samp_freq = |
504 | ARRAY_SIZE(hmc5883_regval_to_samp_freq), | |
357fcff5 | 505 | .regval_to_nanoscale = hmc5883_regval_to_nanoscale, |
585f7ce2 JG |
506 | .n_regval_to_nanoscale = |
507 | ARRAY_SIZE(hmc5883_regval_to_nanoscale), | |
357fcff5 PM |
508 | }, |
509 | [HMC5883L_ID] = { | |
510 | .channels = hmc5883_channels, | |
d4dc0a34 | 511 | .regval_to_samp_freq = hmc5883_regval_to_samp_freq, |
585f7ce2 JG |
512 | .n_regval_to_samp_freq = |
513 | ARRAY_SIZE(hmc5883_regval_to_samp_freq), | |
357fcff5 | 514 | .regval_to_nanoscale = hmc5883l_regval_to_nanoscale, |
585f7ce2 JG |
515 | .n_regval_to_nanoscale = |
516 | ARRAY_SIZE(hmc5883l_regval_to_nanoscale), | |
357fcff5 | 517 | }, |
5a059bd2 JG |
518 | [HMC5983_ID] = { |
519 | .channels = hmc5883_channels, | |
520 | .regval_to_samp_freq = hmc5983_regval_to_samp_freq, | |
521 | .n_regval_to_samp_freq = | |
522 | ARRAY_SIZE(hmc5983_regval_to_samp_freq), | |
523 | .regval_to_nanoscale = hmc5883l_regval_to_nanoscale, | |
524 | .n_regval_to_nanoscale = | |
525 | ARRAY_SIZE(hmc5883l_regval_to_nanoscale), | |
526 | } | |
357fcff5 PM |
527 | }; |
528 | ||
9d5ad0c3 | 529 | static int hmc5843_init(struct hmc5843_data *data) |
b4e17822 | 530 | { |
9d5ad0c3 PM |
531 | int ret; |
532 | u8 id[3]; | |
533 | ||
f326a525 | 534 | ret = regmap_bulk_read(data->regmap, HMC5843_ID_REG, |
7079f21b | 535 | id, ARRAY_SIZE(id)); |
9d5ad0c3 PM |
536 | if (ret < 0) |
537 | return ret; | |
538 | if (id[0] != 'H' || id[1] != '4' || id[2] != '3') { | |
5a059bd2 | 539 | dev_err(data->dev, "no HMC5843/5883/5883L/5983 sensor\n"); |
9d5ad0c3 PM |
540 | return -ENODEV; |
541 | } | |
542 | ||
543 | ret = hmc5843_set_meas_conf(data, HMC5843_MEAS_CONF_NORMAL); | |
544 | if (ret < 0) | |
545 | return ret; | |
546 | ret = hmc5843_set_samp_freq(data, HMC5843_RATE_DEFAULT); | |
547 | if (ret < 0) | |
548 | return ret; | |
549 | ret = hmc5843_set_range_gain(data, HMC5843_RANGE_GAIN_DEFAULT); | |
550 | if (ret < 0) | |
551 | return ret; | |
552 | return hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS); | |
b4e17822 S |
553 | } |
554 | ||
6fe8135f JC |
555 | static const struct iio_info hmc5843_info = { |
556 | .attrs = &hmc5843_group, | |
494c6b15 | 557 | .read_raw = &hmc5843_read_raw, |
d4dc0a34 | 558 | .write_raw = &hmc5843_write_raw, |
ae6f54d2 | 559 | .write_raw_get_fmt = &hmc5843_write_raw_get_fmt, |
6fe8135f JC |
560 | .driver_module = THIS_MODULE, |
561 | }; | |
562 | ||
cb9b9a82 PM |
563 | static const unsigned long hmc5843_scan_masks[] = {0x7, 0}; |
564 | ||
fc35a91b JG |
565 | int hmc5843_common_suspend(struct device *dev) |
566 | { | |
567 | return hmc5843_set_mode(iio_priv(dev_get_drvdata(dev)), | |
568 | HMC5843_MODE_CONVERSION_CONTINUOUS); | |
569 | } | |
570 | EXPORT_SYMBOL(hmc5843_common_suspend); | |
f326a525 | 571 | |
fc35a91b JG |
572 | int hmc5843_common_resume(struct device *dev) |
573 | { | |
574 | return hmc5843_set_mode(iio_priv(dev_get_drvdata(dev)), | |
7079f21b | 575 | HMC5843_MODE_SLEEP); |
fc35a91b JG |
576 | } |
577 | EXPORT_SYMBOL(hmc5843_common_resume); | |
f326a525 | 578 | |
fc35a91b | 579 | int hmc5843_common_probe(struct device *dev, struct regmap *regmap, |
7079f21b | 580 | enum hmc5843_ids id) |
b4e17822 S |
581 | { |
582 | struct hmc5843_data *data; | |
88fa4de4 | 583 | struct iio_dev *indio_dev; |
cb9b9a82 | 584 | int ret; |
b4e17822 | 585 | |
fc35a91b | 586 | indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); |
9fb163f4 | 587 | if (!indio_dev) |
a6dcb71b | 588 | return -ENOMEM; |
b4e17822 | 589 | |
fc35a91b JG |
590 | dev_set_drvdata(dev, indio_dev); |
591 | ||
16b91a40 PM |
592 | /* default settings at probe */ |
593 | data = iio_priv(indio_dev); | |
fc35a91b JG |
594 | data->dev = dev; |
595 | data->regmap = regmap; | |
596 | data->variant = &hmc5843_chip_info_tbl[id]; | |
8e2e2971 | 597 | mutex_init(&data->lock); |
b4e17822 | 598 | |
fc35a91b | 599 | indio_dev->dev.parent = dev; |
dae7f15e | 600 | indio_dev->name = dev->driver->name; |
88fa4de4 | 601 | indio_dev->info = &hmc5843_info; |
88fa4de4 | 602 | indio_dev->modes = INDIO_DIRECT_MODE; |
8e2e2971 | 603 | indio_dev->channels = data->variant->channels; |
cb9b9a82 PM |
604 | indio_dev->num_channels = 4; |
605 | indio_dev->available_scan_masks = hmc5843_scan_masks; | |
8e2e2971 | 606 | |
9d5ad0c3 PM |
607 | ret = hmc5843_init(data); |
608 | if (ret < 0) | |
609 | return ret; | |
c7c34af0 | 610 | |
cb9b9a82 | 611 | ret = iio_triggered_buffer_setup(indio_dev, NULL, |
7079f21b | 612 | hmc5843_trigger_handler, NULL); |
cb9b9a82 | 613 | if (ret < 0) |
e6767051 | 614 | goto buffer_setup_err; |
cb9b9a82 PM |
615 | |
616 | ret = iio_device_register(indio_dev); | |
617 | if (ret < 0) | |
618 | goto buffer_cleanup; | |
c7c34af0 | 619 | |
b4e17822 | 620 | return 0; |
cb9b9a82 PM |
621 | |
622 | buffer_cleanup: | |
623 | iio_triggered_buffer_cleanup(indio_dev); | |
e6767051 CO |
624 | buffer_setup_err: |
625 | hmc5843_set_mode(iio_priv(indio_dev), HMC5843_MODE_SLEEP); | |
cb9b9a82 | 626 | return ret; |
b4e17822 | 627 | } |
fc35a91b | 628 | EXPORT_SYMBOL(hmc5843_common_probe); |
b4e17822 | 629 | |
fc35a91b | 630 | int hmc5843_common_remove(struct device *dev) |
b4e17822 | 631 | { |
fc35a91b | 632 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
cb9b9a82 PM |
633 | |
634 | iio_device_unregister(indio_dev); | |
635 | iio_triggered_buffer_cleanup(indio_dev); | |
636 | ||
094509b1 | 637 | /* sleep mode to save power */ |
62248758 | 638 | hmc5843_set_mode(iio_priv(indio_dev), HMC5843_MODE_SLEEP); |
88fa4de4 | 639 | |
b4e17822 S |
640 | return 0; |
641 | } | |
fc35a91b | 642 | EXPORT_SYMBOL(hmc5843_common_remove); |
b4e17822 | 643 | |
b658a377 | 644 | MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@ti.com>"); |
5a059bd2 | 645 | MODULE_DESCRIPTION("HMC5843/5883/5883L/5983 core driver"); |
b4e17822 | 646 | MODULE_LICENSE("GPL"); |