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3285aae1 AC |
1 | /* |
2 | * A sensor driver for the magnetometer AK8975. | |
3 | * | |
4 | * Magnetic compass sensor driver for monitoring magnetic flux information. | |
5 | * | |
6 | * Copyright (c) 2010, NVIDIA Corporation. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/i2c.h> | |
94a6d5cf | 27 | #include <linux/interrupt.h> |
3285aae1 AC |
28 | #include <linux/err.h> |
29 | #include <linux/mutex.h> | |
30 | #include <linux/delay.h> | |
94a6d5cf | 31 | #include <linux/bitops.h> |
3285aae1 | 32 | #include <linux/gpio.h> |
f4b7f751 | 33 | #include <linux/of_gpio.h> |
d913971e | 34 | #include <linux/acpi.h> |
63d5d525 | 35 | #include <linux/regulator/consumer.h> |
3285aae1 | 36 | |
06458e27 JC |
37 | #include <linux/iio/iio.h> |
38 | #include <linux/iio/sysfs.h> | |
bc11ca4a GB |
39 | #include <linux/iio/buffer.h> |
40 | #include <linux/iio/trigger.h> | |
41 | #include <linux/iio/trigger_consumer.h> | |
42 | #include <linux/iio/triggered_buffer.h> | |
97eacb91 GB |
43 | |
44 | #include <linux/iio/magnetometer/ak8975.h> | |
bc11ca4a | 45 | |
3285aae1 AC |
46 | /* |
47 | * Register definitions, as well as various shifts and masks to get at the | |
48 | * individual fields of the registers. | |
49 | */ | |
50 | #define AK8975_REG_WIA 0x00 | |
51 | #define AK8975_DEVICE_ID 0x48 | |
52 | ||
53 | #define AK8975_REG_INFO 0x01 | |
54 | ||
55 | #define AK8975_REG_ST1 0x02 | |
56 | #define AK8975_REG_ST1_DRDY_SHIFT 0 | |
57 | #define AK8975_REG_ST1_DRDY_MASK (1 << AK8975_REG_ST1_DRDY_SHIFT) | |
58 | ||
59 | #define AK8975_REG_HXL 0x03 | |
60 | #define AK8975_REG_HXH 0x04 | |
61 | #define AK8975_REG_HYL 0x05 | |
62 | #define AK8975_REG_HYH 0x06 | |
63 | #define AK8975_REG_HZL 0x07 | |
64 | #define AK8975_REG_HZH 0x08 | |
65 | #define AK8975_REG_ST2 0x09 | |
66 | #define AK8975_REG_ST2_DERR_SHIFT 2 | |
67 | #define AK8975_REG_ST2_DERR_MASK (1 << AK8975_REG_ST2_DERR_SHIFT) | |
68 | ||
69 | #define AK8975_REG_ST2_HOFL_SHIFT 3 | |
70 | #define AK8975_REG_ST2_HOFL_MASK (1 << AK8975_REG_ST2_HOFL_SHIFT) | |
71 | ||
72 | #define AK8975_REG_CNTL 0x0A | |
73 | #define AK8975_REG_CNTL_MODE_SHIFT 0 | |
74 | #define AK8975_REG_CNTL_MODE_MASK (0xF << AK8975_REG_CNTL_MODE_SHIFT) | |
71222bf5 GG |
75 | #define AK8975_REG_CNTL_MODE_POWER_DOWN 0x00 |
76 | #define AK8975_REG_CNTL_MODE_ONCE 0x01 | |
77 | #define AK8975_REG_CNTL_MODE_SELF_TEST 0x08 | |
78 | #define AK8975_REG_CNTL_MODE_FUSE_ROM 0x0F | |
3285aae1 AC |
79 | |
80 | #define AK8975_REG_RSVC 0x0B | |
81 | #define AK8975_REG_ASTC 0x0C | |
82 | #define AK8975_REG_TS1 0x0D | |
83 | #define AK8975_REG_TS2 0x0E | |
84 | #define AK8975_REG_I2CDIS 0x0F | |
85 | #define AK8975_REG_ASAX 0x10 | |
86 | #define AK8975_REG_ASAY 0x11 | |
87 | #define AK8975_REG_ASAZ 0x12 | |
88 | ||
89 | #define AK8975_MAX_REGS AK8975_REG_ASAZ | |
90 | ||
57e73a42 GG |
91 | /* |
92 | * AK09912 Register definitions | |
93 | */ | |
94 | #define AK09912_REG_WIA1 0x00 | |
95 | #define AK09912_REG_WIA2 0x01 | |
96 | #define AK09912_DEVICE_ID 0x04 | |
97 | #define AK09911_DEVICE_ID 0x05 | |
98 | ||
99 | #define AK09911_REG_INFO1 0x02 | |
100 | #define AK09911_REG_INFO2 0x03 | |
101 | ||
102 | #define AK09912_REG_ST1 0x10 | |
103 | ||
104 | #define AK09912_REG_ST1_DRDY_SHIFT 0 | |
105 | #define AK09912_REG_ST1_DRDY_MASK (1 << AK09912_REG_ST1_DRDY_SHIFT) | |
106 | ||
107 | #define AK09912_REG_HXL 0x11 | |
108 | #define AK09912_REG_HXH 0x12 | |
109 | #define AK09912_REG_HYL 0x13 | |
110 | #define AK09912_REG_HYH 0x14 | |
111 | #define AK09912_REG_HZL 0x15 | |
112 | #define AK09912_REG_HZH 0x16 | |
113 | #define AK09912_REG_TMPS 0x17 | |
114 | ||
115 | #define AK09912_REG_ST2 0x18 | |
116 | #define AK09912_REG_ST2_HOFL_SHIFT 3 | |
117 | #define AK09912_REG_ST2_HOFL_MASK (1 << AK09912_REG_ST2_HOFL_SHIFT) | |
118 | ||
119 | #define AK09912_REG_CNTL1 0x30 | |
120 | ||
121 | #define AK09912_REG_CNTL2 0x31 | |
122 | #define AK09912_REG_CNTL_MODE_POWER_DOWN 0x00 | |
123 | #define AK09912_REG_CNTL_MODE_ONCE 0x01 | |
124 | #define AK09912_REG_CNTL_MODE_SELF_TEST 0x10 | |
125 | #define AK09912_REG_CNTL_MODE_FUSE_ROM 0x1F | |
126 | #define AK09912_REG_CNTL2_MODE_SHIFT 0 | |
127 | #define AK09912_REG_CNTL2_MODE_MASK (0x1F << AK09912_REG_CNTL2_MODE_SHIFT) | |
128 | ||
129 | #define AK09912_REG_CNTL3 0x32 | |
130 | ||
131 | #define AK09912_REG_TS1 0x33 | |
132 | #define AK09912_REG_TS2 0x34 | |
133 | #define AK09912_REG_TS3 0x35 | |
134 | #define AK09912_REG_I2CDIS 0x36 | |
135 | #define AK09912_REG_TS4 0x37 | |
136 | ||
137 | #define AK09912_REG_ASAX 0x60 | |
138 | #define AK09912_REG_ASAY 0x61 | |
139 | #define AK09912_REG_ASAZ 0x62 | |
140 | ||
141 | #define AK09912_MAX_REGS AK09912_REG_ASAZ | |
142 | ||
3285aae1 AC |
143 | /* |
144 | * Miscellaneous values. | |
145 | */ | |
146 | #define AK8975_MAX_CONVERSION_TIMEOUT 500 | |
147 | #define AK8975_CONVERSION_DONE_POLL_TIME 10 | |
94a6d5cf | 148 | #define AK8975_DATA_READY_TIMEOUT ((100*HZ)/1000) |
286f74c2 GG |
149 | |
150 | /* | |
151 | * Precalculate scale factor (in Gauss units) for each axis and | |
152 | * store in the device data. | |
153 | * | |
154 | * This scale factor is axis-dependent, and is derived from 3 calibration | |
155 | * factors ASA(x), ASA(y), and ASA(z). | |
156 | * | |
157 | * These ASA values are read from the sensor device at start of day, and | |
158 | * cached in the device context struct. | |
159 | * | |
160 | * Adjusting the flux value with the sensitivity adjustment value should be | |
161 | * done via the following formula: | |
162 | * | |
163 | * Hadj = H * ( ( ( (ASA-128)*0.5 ) / 128 ) + 1 ) | |
164 | * where H is the raw value, ASA is the sensitivity adjustment, and Hadj | |
165 | * is the resultant adjusted value. | |
166 | * | |
167 | * We reduce the formula to: | |
168 | * | |
169 | * Hadj = H * (ASA + 128) / 256 | |
170 | * | |
171 | * H is in the range of -4096 to 4095. The magnetometer has a range of | |
172 | * +-1229uT. To go from the raw value to uT is: | |
173 | * | |
174 | * HuT = H * 1229/4096, or roughly, 3/10. | |
175 | * | |
176 | * Since 1uT = 0.01 gauss, our final scale factor becomes: | |
177 | * | |
178 | * Hadj = H * ((ASA + 128) / 256) * 3/10 * 1/100 | |
179 | * Hadj = H * ((ASA + 128) * 0.003) / 256 | |
180 | * | |
181 | * Since ASA doesn't change, we cache the resultant scale factor into the | |
182 | * device context in ak8975_setup(). | |
183 | * | |
184 | * Given we use IIO_VAL_INT_PLUS_MICRO bit when displaying the scale, we | |
185 | * multiply the stored scale value by 1e6. | |
186 | */ | |
187 | static long ak8975_raw_to_gauss(u16 data) | |
188 | { | |
189 | return (((long)data + 128) * 3000) / 256; | |
190 | } | |
191 | ||
192 | /* | |
57e73a42 | 193 | * For AK8963 and AK09911, same calculation, but the device is less sensitive: |
286f74c2 GG |
194 | * |
195 | * H is in the range of +-8190. The magnetometer has a range of | |
196 | * +-4912uT. To go from the raw value to uT is: | |
197 | * | |
198 | * HuT = H * 4912/8190, or roughly, 6/10, instead of 3/10. | |
199 | */ | |
57e73a42 GG |
200 | |
201 | static long ak8963_09911_raw_to_gauss(u16 data) | |
286f74c2 GG |
202 | { |
203 | return (((long)data + 128) * 6000) / 256; | |
204 | } | |
6027c077 | 205 | |
57e73a42 GG |
206 | /* |
207 | * For AK09912, same calculation, except the device is more sensitive: | |
208 | * | |
209 | * H is in the range of -32752 to 32752. The magnetometer has a range of | |
210 | * +-4912uT. To go from the raw value to uT is: | |
211 | * | |
212 | * HuT = H * 4912/32752, or roughly, 3/20, instead of 3/10. | |
213 | */ | |
214 | static long ak09912_raw_to_gauss(u16 data) | |
215 | { | |
216 | return (((long)data + 128) * 1500) / 256; | |
217 | } | |
218 | ||
6027c077 SP |
219 | /* Compatible Asahi Kasei Compass parts */ |
220 | enum asahi_compass_chipset { | |
221 | AK8975, | |
222 | AK8963, | |
57e73a42 GG |
223 | AK09911, |
224 | AK09912, | |
286f74c2 GG |
225 | AK_MAX_TYPE |
226 | }; | |
227 | ||
228 | enum ak_ctrl_reg_addr { | |
229 | ST1, | |
230 | ST2, | |
231 | CNTL, | |
232 | ASA_BASE, | |
233 | MAX_REGS, | |
234 | REGS_END, | |
235 | }; | |
236 | ||
237 | enum ak_ctrl_reg_mask { | |
238 | ST1_DRDY, | |
239 | ST2_HOFL, | |
240 | ST2_DERR, | |
241 | CNTL_MODE, | |
242 | MASK_END, | |
243 | }; | |
244 | ||
245 | enum ak_ctrl_mode { | |
246 | POWER_DOWN, | |
247 | MODE_ONCE, | |
248 | SELF_TEST, | |
249 | FUSE_ROM, | |
250 | MODE_END, | |
251 | }; | |
252 | ||
253 | struct ak_def { | |
254 | enum asahi_compass_chipset type; | |
255 | long (*raw_to_gauss)(u16 data); | |
256 | u16 range; | |
257 | u8 ctrl_regs[REGS_END]; | |
258 | u8 ctrl_masks[MASK_END]; | |
259 | u8 ctrl_modes[MODE_END]; | |
260 | u8 data_regs[3]; | |
261 | }; | |
262 | ||
f78c5f96 | 263 | static const struct ak_def ak_def_array[AK_MAX_TYPE] = { |
286f74c2 GG |
264 | { |
265 | .type = AK8975, | |
266 | .raw_to_gauss = ak8975_raw_to_gauss, | |
267 | .range = 4096, | |
268 | .ctrl_regs = { | |
269 | AK8975_REG_ST1, | |
270 | AK8975_REG_ST2, | |
271 | AK8975_REG_CNTL, | |
272 | AK8975_REG_ASAX, | |
273 | AK8975_MAX_REGS}, | |
274 | .ctrl_masks = { | |
275 | AK8975_REG_ST1_DRDY_MASK, | |
276 | AK8975_REG_ST2_HOFL_MASK, | |
277 | AK8975_REG_ST2_DERR_MASK, | |
278 | AK8975_REG_CNTL_MODE_MASK}, | |
279 | .ctrl_modes = { | |
280 | AK8975_REG_CNTL_MODE_POWER_DOWN, | |
281 | AK8975_REG_CNTL_MODE_ONCE, | |
282 | AK8975_REG_CNTL_MODE_SELF_TEST, | |
283 | AK8975_REG_CNTL_MODE_FUSE_ROM}, | |
284 | .data_regs = { | |
285 | AK8975_REG_HXL, | |
286 | AK8975_REG_HYL, | |
287 | AK8975_REG_HZL}, | |
288 | }, | |
289 | { | |
290 | .type = AK8963, | |
57e73a42 | 291 | .raw_to_gauss = ak8963_09911_raw_to_gauss, |
286f74c2 GG |
292 | .range = 8190, |
293 | .ctrl_regs = { | |
294 | AK8975_REG_ST1, | |
295 | AK8975_REG_ST2, | |
296 | AK8975_REG_CNTL, | |
297 | AK8975_REG_ASAX, | |
298 | AK8975_MAX_REGS}, | |
299 | .ctrl_masks = { | |
300 | AK8975_REG_ST1_DRDY_MASK, | |
301 | AK8975_REG_ST2_HOFL_MASK, | |
302 | 0, | |
303 | AK8975_REG_CNTL_MODE_MASK}, | |
304 | .ctrl_modes = { | |
305 | AK8975_REG_CNTL_MODE_POWER_DOWN, | |
306 | AK8975_REG_CNTL_MODE_ONCE, | |
307 | AK8975_REG_CNTL_MODE_SELF_TEST, | |
308 | AK8975_REG_CNTL_MODE_FUSE_ROM}, | |
309 | .data_regs = { | |
310 | AK8975_REG_HXL, | |
311 | AK8975_REG_HYL, | |
312 | AK8975_REG_HZL}, | |
313 | }, | |
57e73a42 GG |
314 | { |
315 | .type = AK09911, | |
316 | .raw_to_gauss = ak8963_09911_raw_to_gauss, | |
317 | .range = 8192, | |
318 | .ctrl_regs = { | |
319 | AK09912_REG_ST1, | |
320 | AK09912_REG_ST2, | |
321 | AK09912_REG_CNTL2, | |
322 | AK09912_REG_ASAX, | |
323 | AK09912_MAX_REGS}, | |
324 | .ctrl_masks = { | |
325 | AK09912_REG_ST1_DRDY_MASK, | |
326 | AK09912_REG_ST2_HOFL_MASK, | |
327 | 0, | |
328 | AK09912_REG_CNTL2_MODE_MASK}, | |
329 | .ctrl_modes = { | |
330 | AK09912_REG_CNTL_MODE_POWER_DOWN, | |
331 | AK09912_REG_CNTL_MODE_ONCE, | |
332 | AK09912_REG_CNTL_MODE_SELF_TEST, | |
333 | AK09912_REG_CNTL_MODE_FUSE_ROM}, | |
334 | .data_regs = { | |
335 | AK09912_REG_HXL, | |
336 | AK09912_REG_HYL, | |
337 | AK09912_REG_HZL}, | |
338 | }, | |
339 | { | |
340 | .type = AK09912, | |
341 | .raw_to_gauss = ak09912_raw_to_gauss, | |
342 | .range = 32752, | |
343 | .ctrl_regs = { | |
344 | AK09912_REG_ST1, | |
345 | AK09912_REG_ST2, | |
346 | AK09912_REG_CNTL2, | |
347 | AK09912_REG_ASAX, | |
348 | AK09912_MAX_REGS}, | |
349 | .ctrl_masks = { | |
350 | AK09912_REG_ST1_DRDY_MASK, | |
351 | AK09912_REG_ST2_HOFL_MASK, | |
352 | 0, | |
353 | AK09912_REG_CNTL2_MODE_MASK}, | |
354 | .ctrl_modes = { | |
355 | AK09912_REG_CNTL_MODE_POWER_DOWN, | |
356 | AK09912_REG_CNTL_MODE_ONCE, | |
357 | AK09912_REG_CNTL_MODE_SELF_TEST, | |
358 | AK09912_REG_CNTL_MODE_FUSE_ROM}, | |
359 | .data_regs = { | |
360 | AK09912_REG_HXL, | |
361 | AK09912_REG_HYL, | |
362 | AK09912_REG_HZL}, | |
363 | } | |
6027c077 | 364 | }; |
3285aae1 AC |
365 | |
366 | /* | |
367 | * Per-instance context data for the device. | |
368 | */ | |
369 | struct ak8975_data { | |
370 | struct i2c_client *client; | |
f78c5f96 | 371 | const struct ak_def *def; |
3285aae1 AC |
372 | struct mutex lock; |
373 | u8 asa[3]; | |
374 | long raw_to_gauss[3]; | |
3285aae1 | 375 | int eoc_gpio; |
94a6d5cf JA |
376 | int eoc_irq; |
377 | wait_queue_head_t data_ready_queue; | |
378 | unsigned long flags; | |
286f74c2 | 379 | u8 cntl_cache; |
97eacb91 | 380 | struct iio_mount_matrix orientation; |
a9b72c90 | 381 | struct regulator *vdd; |
694e1b5f JC |
382 | }; |
383 | ||
a9b72c90 GB |
384 | /* Enable attached power regulator if any. */ |
385 | static int ak8975_power_on(struct i2c_client *client) | |
386 | { | |
387 | const struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
388 | struct ak8975_data *data = iio_priv(indio_dev); | |
389 | int ret; | |
390 | ||
391 | data->vdd = devm_regulator_get(&client->dev, "vdd"); | |
392 | if (IS_ERR_OR_NULL(data->vdd)) { | |
393 | ret = PTR_ERR(data->vdd); | |
394 | if (ret == -ENODEV) | |
395 | ret = 0; | |
396 | } else { | |
397 | ret = regulator_enable(data->vdd); | |
398 | } | |
399 | ||
400 | if (ret) | |
401 | dev_err(&client->dev, "failed to enable Vdd supply: %d\n", ret); | |
402 | return ret; | |
403 | } | |
404 | ||
405 | /* Disable attached power regulator if any. */ | |
406 | static void ak8975_power_off(const struct i2c_client *client) | |
407 | { | |
408 | const struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
409 | const struct ak8975_data *data = iio_priv(indio_dev); | |
410 | ||
411 | if (!IS_ERR_OR_NULL(data->vdd)) | |
412 | regulator_disable(data->vdd); | |
413 | } | |
414 | ||
57e73a42 GG |
415 | /* |
416 | * Return 0 if the i2c device is the one we expect. | |
417 | * return a negative error number otherwise | |
418 | */ | |
419 | static int ak8975_who_i_am(struct i2c_client *client, | |
420 | enum asahi_compass_chipset type) | |
421 | { | |
422 | u8 wia_val[2]; | |
423 | int ret; | |
424 | ||
425 | /* | |
426 | * Signature for each device: | |
427 | * Device | WIA1 | WIA2 | |
428 | * AK09912 | DEVICE_ID | AK09912_DEVICE_ID | |
429 | * AK09911 | DEVICE_ID | AK09911_DEVICE_ID | |
430 | * AK8975 | DEVICE_ID | NA | |
431 | * AK8963 | DEVICE_ID | NA | |
432 | */ | |
a8175ba3 CDL |
433 | ret = i2c_smbus_read_i2c_block_data_or_emulated( |
434 | client, AK09912_REG_WIA1, 2, wia_val); | |
57e73a42 GG |
435 | if (ret < 0) { |
436 | dev_err(&client->dev, "Error reading WIA\n"); | |
437 | return ret; | |
438 | } | |
439 | ||
440 | if (wia_val[0] != AK8975_DEVICE_ID) | |
441 | return -ENODEV; | |
442 | ||
443 | switch (type) { | |
444 | case AK8975: | |
445 | case AK8963: | |
446 | return 0; | |
447 | case AK09911: | |
448 | if (wia_val[1] == AK09911_DEVICE_ID) | |
449 | return 0; | |
450 | break; | |
451 | case AK09912: | |
452 | if (wia_val[1] == AK09912_DEVICE_ID) | |
453 | return 0; | |
454 | break; | |
455 | default: | |
456 | dev_err(&client->dev, "Type %d unknown\n", type); | |
457 | } | |
458 | return -ENODEV; | |
459 | } | |
460 | ||
3285aae1 | 461 | /* |
286f74c2 | 462 | * Helper function to write to CNTL register. |
3285aae1 | 463 | */ |
286f74c2 | 464 | static int ak8975_set_mode(struct ak8975_data *data, enum ak_ctrl_mode mode) |
3285aae1 | 465 | { |
694e1b5f JC |
466 | u8 regval; |
467 | int ret; | |
3285aae1 | 468 | |
286f74c2 GG |
469 | regval = (data->cntl_cache & ~data->def->ctrl_masks[CNTL_MODE]) | |
470 | data->def->ctrl_modes[mode]; | |
471 | ret = i2c_smbus_write_byte_data(data->client, | |
472 | data->def->ctrl_regs[CNTL], regval); | |
3285aae1 | 473 | if (ret < 0) { |
3285aae1 AC |
474 | return ret; |
475 | } | |
286f74c2 GG |
476 | data->cntl_cache = regval; |
477 | /* After mode change wait atleast 100us */ | |
478 | usleep_range(100, 500); | |
3285aae1 AC |
479 | |
480 | return 0; | |
481 | } | |
482 | ||
94a6d5cf JA |
483 | /* |
484 | * Handle data ready irq | |
485 | */ | |
486 | static irqreturn_t ak8975_irq_handler(int irq, void *data) | |
487 | { | |
488 | struct ak8975_data *ak8975 = data; | |
489 | ||
490 | set_bit(0, &ak8975->flags); | |
491 | wake_up(&ak8975->data_ready_queue); | |
492 | ||
493 | return IRQ_HANDLED; | |
494 | } | |
495 | ||
496 | /* | |
497 | * Install data ready interrupt handler | |
498 | */ | |
499 | static int ak8975_setup_irq(struct ak8975_data *data) | |
500 | { | |
501 | struct i2c_client *client = data->client; | |
502 | int rc; | |
503 | int irq; | |
504 | ||
07d2390e KK |
505 | init_waitqueue_head(&data->data_ready_queue); |
506 | clear_bit(0, &data->flags); | |
94a6d5cf JA |
507 | if (client->irq) |
508 | irq = client->irq; | |
509 | else | |
510 | irq = gpio_to_irq(data->eoc_gpio); | |
511 | ||
a845a3aa | 512 | rc = devm_request_irq(&client->dev, irq, ak8975_irq_handler, |
71222bf5 GG |
513 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
514 | dev_name(&client->dev), data); | |
94a6d5cf JA |
515 | if (rc < 0) { |
516 | dev_err(&client->dev, | |
517 | "irq %d request failed, (gpio %d): %d\n", | |
518 | irq, data->eoc_gpio, rc); | |
519 | return rc; | |
520 | } | |
521 | ||
94a6d5cf JA |
522 | data->eoc_irq = irq; |
523 | ||
524 | return rc; | |
525 | } | |
526 | ||
527 | ||
3285aae1 AC |
528 | /* |
529 | * Perform some start-of-day setup, including reading the asa calibration | |
530 | * values and caching them. | |
531 | */ | |
532 | static int ak8975_setup(struct i2c_client *client) | |
533 | { | |
40f32d93 PC |
534 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
535 | struct ak8975_data *data = iio_priv(indio_dev); | |
3285aae1 AC |
536 | int ret; |
537 | ||
3285aae1 | 538 | /* Write the fused rom access mode. */ |
286f74c2 | 539 | ret = ak8975_set_mode(data, FUSE_ROM); |
3285aae1 AC |
540 | if (ret < 0) { |
541 | dev_err(&client->dev, "Error in setting fuse access mode\n"); | |
542 | return ret; | |
543 | } | |
544 | ||
545 | /* Get asa data and store in the device data. */ | |
a8175ba3 CDL |
546 | ret = i2c_smbus_read_i2c_block_data_or_emulated( |
547 | client, data->def->ctrl_regs[ASA_BASE], | |
548 | 3, data->asa); | |
3285aae1 AC |
549 | if (ret < 0) { |
550 | dev_err(&client->dev, "Not able to read asa data\n"); | |
551 | return ret; | |
552 | } | |
553 | ||
040f3e58 | 554 | /* After reading fuse ROM data set power-down mode */ |
286f74c2 | 555 | ret = ak8975_set_mode(data, POWER_DOWN); |
71222bf5 GG |
556 | if (ret < 0) { |
557 | dev_err(&client->dev, "Error in setting power-down mode\n"); | |
558 | return ret; | |
559 | } | |
94a6d5cf | 560 | |
71222bf5 | 561 | if (data->eoc_gpio > 0 || client->irq > 0) { |
94a6d5cf JA |
562 | ret = ak8975_setup_irq(data); |
563 | if (ret < 0) { | |
564 | dev_err(&client->dev, | |
565 | "Error setting data ready interrupt\n"); | |
566 | return ret; | |
567 | } | |
568 | } | |
569 | ||
286f74c2 GG |
570 | data->raw_to_gauss[0] = data->def->raw_to_gauss(data->asa[0]); |
571 | data->raw_to_gauss[1] = data->def->raw_to_gauss(data->asa[1]); | |
572 | data->raw_to_gauss[2] = data->def->raw_to_gauss(data->asa[2]); | |
3285aae1 AC |
573 | |
574 | return 0; | |
575 | } | |
576 | ||
01fbb478 AC |
577 | static int wait_conversion_complete_gpio(struct ak8975_data *data) |
578 | { | |
579 | struct i2c_client *client = data->client; | |
01fbb478 AC |
580 | u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT; |
581 | int ret; | |
582 | ||
583 | /* Wait for the conversion to complete. */ | |
584 | while (timeout_ms) { | |
585 | msleep(AK8975_CONVERSION_DONE_POLL_TIME); | |
586 | if (gpio_get_value(data->eoc_gpio)) | |
587 | break; | |
588 | timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME; | |
589 | } | |
590 | if (!timeout_ms) { | |
591 | dev_err(&client->dev, "Conversion timeout happened\n"); | |
592 | return -EINVAL; | |
593 | } | |
594 | ||
286f74c2 | 595 | ret = i2c_smbus_read_byte_data(client, data->def->ctrl_regs[ST1]); |
c411f600 | 596 | if (ret < 0) |
01fbb478 | 597 | dev_err(&client->dev, "Error in reading ST1\n"); |
c411f600 JC |
598 | |
599 | return ret; | |
01fbb478 AC |
600 | } |
601 | ||
602 | static int wait_conversion_complete_polled(struct ak8975_data *data) | |
603 | { | |
604 | struct i2c_client *client = data->client; | |
605 | u8 read_status; | |
606 | u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT; | |
607 | int ret; | |
608 | ||
609 | /* Wait for the conversion to complete. */ | |
610 | while (timeout_ms) { | |
611 | msleep(AK8975_CONVERSION_DONE_POLL_TIME); | |
286f74c2 GG |
612 | ret = i2c_smbus_read_byte_data(client, |
613 | data->def->ctrl_regs[ST1]); | |
01fbb478 AC |
614 | if (ret < 0) { |
615 | dev_err(&client->dev, "Error in reading ST1\n"); | |
616 | return ret; | |
617 | } | |
c411f600 | 618 | read_status = ret; |
01fbb478 AC |
619 | if (read_status) |
620 | break; | |
621 | timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME; | |
622 | } | |
623 | if (!timeout_ms) { | |
624 | dev_err(&client->dev, "Conversion timeout happened\n"); | |
625 | return -EINVAL; | |
626 | } | |
94a6d5cf | 627 | |
01fbb478 AC |
628 | return read_status; |
629 | } | |
630 | ||
94a6d5cf JA |
631 | /* Returns 0 if the end of conversion interrupt occured or -ETIME otherwise */ |
632 | static int wait_conversion_complete_interrupt(struct ak8975_data *data) | |
633 | { | |
634 | int ret; | |
635 | ||
636 | ret = wait_event_timeout(data->data_ready_queue, | |
637 | test_bit(0, &data->flags), | |
638 | AK8975_DATA_READY_TIMEOUT); | |
639 | clear_bit(0, &data->flags); | |
640 | ||
641 | return ret > 0 ? 0 : -ETIME; | |
642 | } | |
643 | ||
bc11ca4a GB |
644 | static int ak8975_start_read_axis(struct ak8975_data *data, |
645 | const struct i2c_client *client) | |
3285aae1 | 646 | { |
3285aae1 | 647 | /* Set up the device for taking a sample. */ |
bc11ca4a GB |
648 | int ret = ak8975_set_mode(data, MODE_ONCE); |
649 | ||
3285aae1 AC |
650 | if (ret < 0) { |
651 | dev_err(&client->dev, "Error in setting operating mode\n"); | |
bc11ca4a | 652 | return ret; |
3285aae1 AC |
653 | } |
654 | ||
655 | /* Wait for the conversion to complete. */ | |
94a6d5cf JA |
656 | if (data->eoc_irq) |
657 | ret = wait_conversion_complete_interrupt(data); | |
658 | else if (gpio_is_valid(data->eoc_gpio)) | |
01fbb478 AC |
659 | ret = wait_conversion_complete_gpio(data); |
660 | else | |
661 | ret = wait_conversion_complete_polled(data); | |
662 | if (ret < 0) | |
bc11ca4a | 663 | return ret; |
3285aae1 | 664 | |
94a6d5cf | 665 | /* This will be executed only for non-interrupt based waiting case */ |
286f74c2 GG |
666 | if (ret & data->def->ctrl_masks[ST1_DRDY]) { |
667 | ret = i2c_smbus_read_byte_data(client, | |
668 | data->def->ctrl_regs[ST2]); | |
3285aae1 AC |
669 | if (ret < 0) { |
670 | dev_err(&client->dev, "Error in reading ST2\n"); | |
bc11ca4a | 671 | return ret; |
3285aae1 | 672 | } |
286f74c2 GG |
673 | if (ret & (data->def->ctrl_masks[ST2_DERR] | |
674 | data->def->ctrl_masks[ST2_HOFL])) { | |
c411f600 | 675 | dev_err(&client->dev, "ST2 status error 0x%x\n", ret); |
bc11ca4a | 676 | return -EINVAL; |
3285aae1 AC |
677 | } |
678 | } | |
679 | ||
bc11ca4a GB |
680 | return 0; |
681 | } | |
682 | ||
683 | /* Retrieve raw flux value for one of the x, y, or z axis. */ | |
684 | static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val) | |
685 | { | |
686 | struct ak8975_data *data = iio_priv(indio_dev); | |
687 | const struct i2c_client *client = data->client; | |
688 | const struct ak_def *def = data->def; | |
a8175ba3 | 689 | u16 buff; |
bc11ca4a GB |
690 | int ret; |
691 | ||
692 | mutex_lock(&data->lock); | |
693 | ||
694 | ret = ak8975_start_read_axis(data, client); | |
695 | if (ret) | |
696 | goto exit; | |
697 | ||
a8175ba3 CDL |
698 | ret = i2c_smbus_read_i2c_block_data_or_emulated( |
699 | client, def->data_regs[index], | |
700 | sizeof(buff), (u8*)&buff); | |
bc11ca4a | 701 | if (ret < 0) |
3285aae1 | 702 | goto exit; |
3285aae1 AC |
703 | |
704 | mutex_unlock(&data->lock); | |
705 | ||
a8175ba3 CDL |
706 | /* Swap bytes and convert to valid range. */ |
707 | buff = le16_to_cpu(buff); | |
708 | *val = clamp_t(s16, buff, -def->range, def->range); | |
694e1b5f | 709 | return IIO_VAL_INT; |
3285aae1 AC |
710 | |
711 | exit: | |
712 | mutex_unlock(&data->lock); | |
bc11ca4a | 713 | dev_err(&client->dev, "Error in reading axis\n"); |
3285aae1 AC |
714 | return ret; |
715 | } | |
716 | ||
694e1b5f JC |
717 | static int ak8975_read_raw(struct iio_dev *indio_dev, |
718 | struct iio_chan_spec const *chan, | |
719 | int *val, int *val2, | |
720 | long mask) | |
721 | { | |
722 | struct ak8975_data *data = iio_priv(indio_dev); | |
723 | ||
724 | switch (mask) { | |
4d9948b3 | 725 | case IIO_CHAN_INFO_RAW: |
694e1b5f | 726 | return ak8975_read_axis(indio_dev, chan->address, val); |
c8a9f805 | 727 | case IIO_CHAN_INFO_SCALE: |
bef44abc BS |
728 | *val = 0; |
729 | *val2 = data->raw_to_gauss[chan->address]; | |
730 | return IIO_VAL_INT_PLUS_MICRO; | |
694e1b5f JC |
731 | } |
732 | return -EINVAL; | |
733 | } | |
734 | ||
97eacb91 GB |
735 | static const struct iio_mount_matrix * |
736 | ak8975_get_mount_matrix(const struct iio_dev *indio_dev, | |
737 | const struct iio_chan_spec *chan) | |
738 | { | |
739 | return &((struct ak8975_data *)iio_priv(indio_dev))->orientation; | |
740 | } | |
741 | ||
742 | static const struct iio_chan_spec_ext_info ak8975_ext_info[] = { | |
743 | IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, ak8975_get_mount_matrix), | |
744 | { }, | |
745 | }; | |
746 | ||
694e1b5f JC |
747 | #define AK8975_CHANNEL(axis, index) \ |
748 | { \ | |
749 | .type = IIO_MAGN, \ | |
750 | .modified = 1, \ | |
751 | .channel2 = IIO_MOD_##axis, \ | |
3a0b4422 JC |
752 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
753 | BIT(IIO_CHAN_INFO_SCALE), \ | |
694e1b5f | 754 | .address = index, \ |
bc11ca4a GB |
755 | .scan_index = index, \ |
756 | .scan_type = { \ | |
757 | .sign = 's', \ | |
758 | .realbits = 16, \ | |
759 | .storagebits = 16, \ | |
760 | .endianness = IIO_CPU \ | |
97eacb91 GB |
761 | }, \ |
762 | .ext_info = ak8975_ext_info, \ | |
694e1b5f JC |
763 | } |
764 | ||
765 | static const struct iio_chan_spec ak8975_channels[] = { | |
766 | AK8975_CHANNEL(X, 0), AK8975_CHANNEL(Y, 1), AK8975_CHANNEL(Z, 2), | |
bc11ca4a | 767 | IIO_CHAN_SOFT_TIMESTAMP(3), |
694e1b5f JC |
768 | }; |
769 | ||
bc11ca4a GB |
770 | static const unsigned long ak8975_scan_masks[] = { 0x7, 0 }; |
771 | ||
6fe8135f | 772 | static const struct iio_info ak8975_info = { |
694e1b5f | 773 | .read_raw = &ak8975_read_raw, |
6fe8135f JC |
774 | .driver_module = THIS_MODULE, |
775 | }; | |
776 | ||
d913971e SP |
777 | static const struct acpi_device_id ak_acpi_match[] = { |
778 | {"AK8975", AK8975}, | |
779 | {"AK8963", AK8963}, | |
780 | {"INVN6500", AK8963}, | |
57e73a42 GG |
781 | {"AK09911", AK09911}, |
782 | {"AK09912", AK09912}, | |
d913971e SP |
783 | { }, |
784 | }; | |
785 | MODULE_DEVICE_TABLE(acpi, ak_acpi_match); | |
786 | ||
48edc374 IT |
787 | static const char *ak8975_match_acpi_device(struct device *dev, |
788 | enum asahi_compass_chipset *chipset) | |
d913971e SP |
789 | { |
790 | const struct acpi_device_id *id; | |
791 | ||
792 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
793 | if (!id) | |
794 | return NULL; | |
795 | *chipset = (int)id->driver_data; | |
796 | ||
48edc374 | 797 | return dev_name(dev); |
d913971e SP |
798 | } |
799 | ||
bc11ca4a GB |
800 | static void ak8975_fill_buffer(struct iio_dev *indio_dev) |
801 | { | |
802 | struct ak8975_data *data = iio_priv(indio_dev); | |
803 | const struct i2c_client *client = data->client; | |
804 | const struct ak_def *def = data->def; | |
805 | int ret; | |
806 | s16 buff[8]; /* 3 x 16 bits axis values + 1 aligned 64 bits timestamp */ | |
807 | ||
808 | mutex_lock(&data->lock); | |
809 | ||
810 | ret = ak8975_start_read_axis(data, client); | |
811 | if (ret) | |
812 | goto unlock; | |
813 | ||
814 | /* | |
815 | * For each axis, read the flux value from the appropriate register | |
816 | * (the register is specified in the iio device attributes). | |
817 | */ | |
818 | ret = i2c_smbus_read_i2c_block_data_or_emulated(client, | |
819 | def->data_regs[0], | |
820 | 3 * sizeof(buff[0]), | |
821 | (u8 *)buff); | |
822 | if (ret < 0) | |
823 | goto unlock; | |
824 | ||
825 | mutex_unlock(&data->lock); | |
826 | ||
827 | /* Clamp to valid range. */ | |
828 | buff[0] = clamp_t(s16, le16_to_cpu(buff[0]), -def->range, def->range); | |
829 | buff[1] = clamp_t(s16, le16_to_cpu(buff[1]), -def->range, def->range); | |
830 | buff[2] = clamp_t(s16, le16_to_cpu(buff[2]), -def->range, def->range); | |
831 | ||
bc2b7dab GB |
832 | iio_push_to_buffers_with_timestamp(indio_dev, buff, |
833 | iio_get_time_ns(indio_dev)); | |
bc11ca4a GB |
834 | return; |
835 | ||
836 | unlock: | |
837 | mutex_unlock(&data->lock); | |
838 | dev_err(&client->dev, "Error in reading axes block\n"); | |
839 | } | |
840 | ||
841 | static irqreturn_t ak8975_handle_trigger(int irq, void *p) | |
842 | { | |
843 | const struct iio_poll_func *pf = p; | |
844 | struct iio_dev *indio_dev = pf->indio_dev; | |
845 | ||
846 | ak8975_fill_buffer(indio_dev); | |
847 | iio_trigger_notify_done(indio_dev->trig); | |
848 | return IRQ_HANDLED; | |
849 | } | |
850 | ||
4ae1c61f | 851 | static int ak8975_probe(struct i2c_client *client, |
3285aae1 AC |
852 | const struct i2c_device_id *id) |
853 | { | |
854 | struct ak8975_data *data; | |
338473c8 JC |
855 | struct iio_dev *indio_dev; |
856 | int eoc_gpio; | |
3285aae1 | 857 | int err; |
48edc374 | 858 | const char *name = NULL; |
05be8d41 | 859 | enum asahi_compass_chipset chipset = AK_MAX_TYPE; |
97eacb91 GB |
860 | const struct ak8975_platform_data *pdata = |
861 | dev_get_platdata(&client->dev); | |
3285aae1 | 862 | |
3285aae1 | 863 | /* Grab and set up the supplied GPIO. */ |
97eacb91 GB |
864 | if (pdata) |
865 | eoc_gpio = pdata->eoc_gpio; | |
f4b7f751 JA |
866 | else if (client->dev.of_node) |
867 | eoc_gpio = of_get_gpio(client->dev.of_node, 0); | |
868 | else | |
869 | eoc_gpio = -1; | |
870 | ||
871 | if (eoc_gpio == -EPROBE_DEFER) | |
872 | return -EPROBE_DEFER; | |
3285aae1 | 873 | |
01fbb478 AC |
874 | /* We may not have a GPIO based IRQ to scan, that is fine, we will |
875 | poll if so */ | |
7c6c9368 | 876 | if (gpio_is_valid(eoc_gpio)) { |
a845a3aa BS |
877 | err = devm_gpio_request_one(&client->dev, eoc_gpio, |
878 | GPIOF_IN, "ak_8975"); | |
01fbb478 AC |
879 | if (err < 0) { |
880 | dev_err(&client->dev, | |
881 | "failed to request GPIO %d, error %d\n", | |
338473c8 | 882 | eoc_gpio, err); |
a845a3aa | 883 | return err; |
01fbb478 | 884 | } |
7c6c9368 | 885 | } |
3285aae1 | 886 | |
338473c8 | 887 | /* Register with IIO */ |
a845a3aa BS |
888 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
889 | if (indio_dev == NULL) | |
890 | return -ENOMEM; | |
891 | ||
338473c8 | 892 | data = iio_priv(indio_dev); |
40f32d93 | 893 | i2c_set_clientdata(client, indio_dev); |
94a6d5cf JA |
894 | |
895 | data->client = client; | |
896 | data->eoc_gpio = eoc_gpio; | |
897 | data->eoc_irq = 0; | |
898 | ||
97eacb91 GB |
899 | if (!pdata) { |
900 | err = of_iio_read_mount_matrix(&client->dev, | |
901 | "mount-matrix", | |
902 | &data->orientation); | |
903 | if (err) | |
904 | return err; | |
905 | } else | |
906 | data->orientation = pdata->orientation; | |
907 | ||
d913971e SP |
908 | /* id will be NULL when enumerated via ACPI */ |
909 | if (id) { | |
286f74c2 | 910 | chipset = (enum asahi_compass_chipset)(id->driver_data); |
48edc374 | 911 | name = id->name; |
55c0c530 | 912 | } else if (ACPI_HANDLE(&client->dev)) { |
286f74c2 | 913 | name = ak8975_match_acpi_device(&client->dev, &chipset); |
55c0c530 GB |
914 | if (!name) |
915 | return -ENODEV; | |
26b89d7d | 916 | } else |
a845a3aa BS |
917 | return -ENOSYS; |
918 | ||
286f74c2 GG |
919 | if (chipset >= AK_MAX_TYPE) { |
920 | dev_err(&client->dev, "AKM device type unsupported: %d\n", | |
921 | chipset); | |
922 | return -ENODEV; | |
923 | } | |
924 | ||
925 | data->def = &ak_def_array[chipset]; | |
a9b72c90 GB |
926 | |
927 | err = ak8975_power_on(client); | |
928 | if (err) | |
929 | return err; | |
930 | ||
57e73a42 GG |
931 | err = ak8975_who_i_am(client, data->def->type); |
932 | if (err < 0) { | |
933 | dev_err(&client->dev, "Unexpected device\n"); | |
a9b72c90 | 934 | goto power_off; |
57e73a42 | 935 | } |
d913971e | 936 | dev_dbg(&client->dev, "Asahi compass chip %s\n", name); |
6027c077 | 937 | |
3285aae1 AC |
938 | /* Perform some basic start-of-day setup of the device. */ |
939 | err = ak8975_setup(client); | |
940 | if (err < 0) { | |
71222bf5 | 941 | dev_err(&client->dev, "%s initialization fails\n", name); |
a9b72c90 | 942 | goto power_off; |
3285aae1 AC |
943 | } |
944 | ||
338473c8 | 945 | mutex_init(&data->lock); |
338473c8 | 946 | indio_dev->dev.parent = &client->dev; |
694e1b5f JC |
947 | indio_dev->channels = ak8975_channels; |
948 | indio_dev->num_channels = ARRAY_SIZE(ak8975_channels); | |
338473c8 | 949 | indio_dev->info = &ak8975_info; |
bc11ca4a | 950 | indio_dev->available_scan_masks = ak8975_scan_masks; |
338473c8 | 951 | indio_dev->modes = INDIO_DIRECT_MODE; |
d913971e | 952 | indio_dev->name = name; |
a9b72c90 | 953 | |
bc11ca4a GB |
954 | err = iio_triggered_buffer_setup(indio_dev, NULL, ak8975_handle_trigger, |
955 | NULL); | |
956 | if (err) { | |
957 | dev_err(&client->dev, "triggered buffer setup failed\n"); | |
a9b72c90 | 958 | goto power_off; |
bc11ca4a GB |
959 | } |
960 | ||
961 | err = iio_device_register(indio_dev); | |
962 | if (err) { | |
963 | dev_err(&client->dev, "device register failed\n"); | |
964 | goto cleanup_buffer; | |
965 | } | |
a9b72c90 GB |
966 | |
967 | return 0; | |
968 | ||
bc11ca4a GB |
969 | cleanup_buffer: |
970 | iio_triggered_buffer_cleanup(indio_dev); | |
a9b72c90 GB |
971 | power_off: |
972 | ak8975_power_off(client); | |
973 | return err; | |
974 | } | |
975 | ||
976 | static int ak8975_remove(struct i2c_client *client) | |
977 | { | |
978 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
979 | ||
980 | iio_device_unregister(indio_dev); | |
bc11ca4a | 981 | iio_triggered_buffer_cleanup(indio_dev); |
a9b72c90 GB |
982 | ak8975_power_off(client); |
983 | ||
984 | return 0; | |
3285aae1 AC |
985 | } |
986 | ||
987 | static const struct i2c_device_id ak8975_id[] = { | |
6027c077 SP |
988 | {"ak8975", AK8975}, |
989 | {"ak8963", AK8963}, | |
2d8339d0 | 990 | {"AK8963", AK8963}, |
57e73a42 GG |
991 | {"ak09911", AK09911}, |
992 | {"ak09912", AK09912}, | |
3285aae1 AC |
993 | {} |
994 | }; | |
995 | ||
996 | MODULE_DEVICE_TABLE(i2c, ak8975_id); | |
997 | ||
54461c30 OJ |
998 | static const struct of_device_id ak8975_of_match[] = { |
999 | { .compatible = "asahi-kasei,ak8975", }, | |
1000 | { .compatible = "ak8975", }, | |
286f74c2 GG |
1001 | { .compatible = "asahi-kasei,ak8963", }, |
1002 | { .compatible = "ak8963", }, | |
57e73a42 GG |
1003 | { .compatible = "asahi-kasei,ak09911", }, |
1004 | { .compatible = "ak09911", }, | |
1005 | { .compatible = "asahi-kasei,ak09912", }, | |
1006 | { .compatible = "ak09912", }, | |
286f74c2 | 1007 | {} |
54461c30 OJ |
1008 | }; |
1009 | MODULE_DEVICE_TABLE(of, ak8975_of_match); | |
1010 | ||
3285aae1 AC |
1011 | static struct i2c_driver ak8975_driver = { |
1012 | .driver = { | |
1013 | .name = "ak8975", | |
71222bf5 | 1014 | .of_match_table = of_match_ptr(ak8975_of_match), |
d913971e | 1015 | .acpi_match_table = ACPI_PTR(ak_acpi_match), |
3285aae1 AC |
1016 | }, |
1017 | .probe = ak8975_probe, | |
a9b72c90 | 1018 | .remove = ak8975_remove, |
3285aae1 AC |
1019 | .id_table = ak8975_id, |
1020 | }; | |
6e5af184 | 1021 | module_i2c_driver(ak8975_driver); |
3285aae1 AC |
1022 | |
1023 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
1024 | MODULE_DESCRIPTION("AK8975 magnetometer driver"); | |
1025 | MODULE_LICENSE("GPL"); |