Commit | Line | Data |
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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> |
cde4cb5d | 36 | #include <linux/pm_runtime.h> |
3285aae1 | 37 | |
06458e27 JC |
38 | #include <linux/iio/iio.h> |
39 | #include <linux/iio/sysfs.h> | |
bc11ca4a GB |
40 | #include <linux/iio/buffer.h> |
41 | #include <linux/iio/trigger.h> | |
42 | #include <linux/iio/trigger_consumer.h> | |
43 | #include <linux/iio/triggered_buffer.h> | |
97eacb91 GB |
44 | |
45 | #include <linux/iio/magnetometer/ak8975.h> | |
bc11ca4a | 46 | |
3285aae1 AC |
47 | /* |
48 | * Register definitions, as well as various shifts and masks to get at the | |
49 | * individual fields of the registers. | |
50 | */ | |
51 | #define AK8975_REG_WIA 0x00 | |
52 | #define AK8975_DEVICE_ID 0x48 | |
53 | ||
54 | #define AK8975_REG_INFO 0x01 | |
55 | ||
56 | #define AK8975_REG_ST1 0x02 | |
57 | #define AK8975_REG_ST1_DRDY_SHIFT 0 | |
58 | #define AK8975_REG_ST1_DRDY_MASK (1 << AK8975_REG_ST1_DRDY_SHIFT) | |
59 | ||
60 | #define AK8975_REG_HXL 0x03 | |
61 | #define AK8975_REG_HXH 0x04 | |
62 | #define AK8975_REG_HYL 0x05 | |
63 | #define AK8975_REG_HYH 0x06 | |
64 | #define AK8975_REG_HZL 0x07 | |
65 | #define AK8975_REG_HZH 0x08 | |
66 | #define AK8975_REG_ST2 0x09 | |
67 | #define AK8975_REG_ST2_DERR_SHIFT 2 | |
68 | #define AK8975_REG_ST2_DERR_MASK (1 << AK8975_REG_ST2_DERR_SHIFT) | |
69 | ||
70 | #define AK8975_REG_ST2_HOFL_SHIFT 3 | |
71 | #define AK8975_REG_ST2_HOFL_MASK (1 << AK8975_REG_ST2_HOFL_SHIFT) | |
72 | ||
73 | #define AK8975_REG_CNTL 0x0A | |
74 | #define AK8975_REG_CNTL_MODE_SHIFT 0 | |
75 | #define AK8975_REG_CNTL_MODE_MASK (0xF << AK8975_REG_CNTL_MODE_SHIFT) | |
71222bf5 GG |
76 | #define AK8975_REG_CNTL_MODE_POWER_DOWN 0x00 |
77 | #define AK8975_REG_CNTL_MODE_ONCE 0x01 | |
78 | #define AK8975_REG_CNTL_MODE_SELF_TEST 0x08 | |
79 | #define AK8975_REG_CNTL_MODE_FUSE_ROM 0x0F | |
3285aae1 AC |
80 | |
81 | #define AK8975_REG_RSVC 0x0B | |
82 | #define AK8975_REG_ASTC 0x0C | |
83 | #define AK8975_REG_TS1 0x0D | |
84 | #define AK8975_REG_TS2 0x0E | |
85 | #define AK8975_REG_I2CDIS 0x0F | |
86 | #define AK8975_REG_ASAX 0x10 | |
87 | #define AK8975_REG_ASAY 0x11 | |
88 | #define AK8975_REG_ASAZ 0x12 | |
89 | ||
90 | #define AK8975_MAX_REGS AK8975_REG_ASAZ | |
91 | ||
57e73a42 GG |
92 | /* |
93 | * AK09912 Register definitions | |
94 | */ | |
95 | #define AK09912_REG_WIA1 0x00 | |
96 | #define AK09912_REG_WIA2 0x01 | |
97 | #define AK09912_DEVICE_ID 0x04 | |
98 | #define AK09911_DEVICE_ID 0x05 | |
99 | ||
100 | #define AK09911_REG_INFO1 0x02 | |
101 | #define AK09911_REG_INFO2 0x03 | |
102 | ||
103 | #define AK09912_REG_ST1 0x10 | |
104 | ||
105 | #define AK09912_REG_ST1_DRDY_SHIFT 0 | |
106 | #define AK09912_REG_ST1_DRDY_MASK (1 << AK09912_REG_ST1_DRDY_SHIFT) | |
107 | ||
108 | #define AK09912_REG_HXL 0x11 | |
109 | #define AK09912_REG_HXH 0x12 | |
110 | #define AK09912_REG_HYL 0x13 | |
111 | #define AK09912_REG_HYH 0x14 | |
112 | #define AK09912_REG_HZL 0x15 | |
113 | #define AK09912_REG_HZH 0x16 | |
114 | #define AK09912_REG_TMPS 0x17 | |
115 | ||
116 | #define AK09912_REG_ST2 0x18 | |
117 | #define AK09912_REG_ST2_HOFL_SHIFT 3 | |
118 | #define AK09912_REG_ST2_HOFL_MASK (1 << AK09912_REG_ST2_HOFL_SHIFT) | |
119 | ||
120 | #define AK09912_REG_CNTL1 0x30 | |
121 | ||
122 | #define AK09912_REG_CNTL2 0x31 | |
123 | #define AK09912_REG_CNTL_MODE_POWER_DOWN 0x00 | |
124 | #define AK09912_REG_CNTL_MODE_ONCE 0x01 | |
125 | #define AK09912_REG_CNTL_MODE_SELF_TEST 0x10 | |
126 | #define AK09912_REG_CNTL_MODE_FUSE_ROM 0x1F | |
127 | #define AK09912_REG_CNTL2_MODE_SHIFT 0 | |
128 | #define AK09912_REG_CNTL2_MODE_MASK (0x1F << AK09912_REG_CNTL2_MODE_SHIFT) | |
129 | ||
130 | #define AK09912_REG_CNTL3 0x32 | |
131 | ||
132 | #define AK09912_REG_TS1 0x33 | |
133 | #define AK09912_REG_TS2 0x34 | |
134 | #define AK09912_REG_TS3 0x35 | |
135 | #define AK09912_REG_I2CDIS 0x36 | |
136 | #define AK09912_REG_TS4 0x37 | |
137 | ||
138 | #define AK09912_REG_ASAX 0x60 | |
139 | #define AK09912_REG_ASAY 0x61 | |
140 | #define AK09912_REG_ASAZ 0x62 | |
141 | ||
142 | #define AK09912_MAX_REGS AK09912_REG_ASAZ | |
143 | ||
3285aae1 AC |
144 | /* |
145 | * Miscellaneous values. | |
146 | */ | |
147 | #define AK8975_MAX_CONVERSION_TIMEOUT 500 | |
148 | #define AK8975_CONVERSION_DONE_POLL_TIME 10 | |
94a6d5cf | 149 | #define AK8975_DATA_READY_TIMEOUT ((100*HZ)/1000) |
286f74c2 GG |
150 | |
151 | /* | |
152 | * Precalculate scale factor (in Gauss units) for each axis and | |
153 | * store in the device data. | |
154 | * | |
155 | * This scale factor is axis-dependent, and is derived from 3 calibration | |
156 | * factors ASA(x), ASA(y), and ASA(z). | |
157 | * | |
158 | * These ASA values are read from the sensor device at start of day, and | |
159 | * cached in the device context struct. | |
160 | * | |
161 | * Adjusting the flux value with the sensitivity adjustment value should be | |
162 | * done via the following formula: | |
163 | * | |
164 | * Hadj = H * ( ( ( (ASA-128)*0.5 ) / 128 ) + 1 ) | |
165 | * where H is the raw value, ASA is the sensitivity adjustment, and Hadj | |
166 | * is the resultant adjusted value. | |
167 | * | |
168 | * We reduce the formula to: | |
169 | * | |
170 | * Hadj = H * (ASA + 128) / 256 | |
171 | * | |
172 | * H is in the range of -4096 to 4095. The magnetometer has a range of | |
173 | * +-1229uT. To go from the raw value to uT is: | |
174 | * | |
175 | * HuT = H * 1229/4096, or roughly, 3/10. | |
176 | * | |
177 | * Since 1uT = 0.01 gauss, our final scale factor becomes: | |
178 | * | |
179 | * Hadj = H * ((ASA + 128) / 256) * 3/10 * 1/100 | |
180 | * Hadj = H * ((ASA + 128) * 0.003) / 256 | |
181 | * | |
182 | * Since ASA doesn't change, we cache the resultant scale factor into the | |
183 | * device context in ak8975_setup(). | |
184 | * | |
185 | * Given we use IIO_VAL_INT_PLUS_MICRO bit when displaying the scale, we | |
186 | * multiply the stored scale value by 1e6. | |
187 | */ | |
188 | static long ak8975_raw_to_gauss(u16 data) | |
189 | { | |
190 | return (((long)data + 128) * 3000) / 256; | |
191 | } | |
192 | ||
193 | /* | |
57e73a42 | 194 | * For AK8963 and AK09911, same calculation, but the device is less sensitive: |
286f74c2 GG |
195 | * |
196 | * H is in the range of +-8190. The magnetometer has a range of | |
197 | * +-4912uT. To go from the raw value to uT is: | |
198 | * | |
199 | * HuT = H * 4912/8190, or roughly, 6/10, instead of 3/10. | |
200 | */ | |
57e73a42 GG |
201 | |
202 | static long ak8963_09911_raw_to_gauss(u16 data) | |
286f74c2 GG |
203 | { |
204 | return (((long)data + 128) * 6000) / 256; | |
205 | } | |
6027c077 | 206 | |
57e73a42 GG |
207 | /* |
208 | * For AK09912, same calculation, except the device is more sensitive: | |
209 | * | |
210 | * H is in the range of -32752 to 32752. The magnetometer has a range of | |
211 | * +-4912uT. To go from the raw value to uT is: | |
212 | * | |
213 | * HuT = H * 4912/32752, or roughly, 3/20, instead of 3/10. | |
214 | */ | |
215 | static long ak09912_raw_to_gauss(u16 data) | |
216 | { | |
217 | return (((long)data + 128) * 1500) / 256; | |
218 | } | |
219 | ||
6027c077 SP |
220 | /* Compatible Asahi Kasei Compass parts */ |
221 | enum asahi_compass_chipset { | |
222 | AK8975, | |
223 | AK8963, | |
57e73a42 GG |
224 | AK09911, |
225 | AK09912, | |
286f74c2 GG |
226 | AK_MAX_TYPE |
227 | }; | |
228 | ||
229 | enum ak_ctrl_reg_addr { | |
230 | ST1, | |
231 | ST2, | |
232 | CNTL, | |
233 | ASA_BASE, | |
234 | MAX_REGS, | |
235 | REGS_END, | |
236 | }; | |
237 | ||
238 | enum ak_ctrl_reg_mask { | |
239 | ST1_DRDY, | |
240 | ST2_HOFL, | |
241 | ST2_DERR, | |
242 | CNTL_MODE, | |
243 | MASK_END, | |
244 | }; | |
245 | ||
246 | enum ak_ctrl_mode { | |
247 | POWER_DOWN, | |
248 | MODE_ONCE, | |
249 | SELF_TEST, | |
250 | FUSE_ROM, | |
251 | MODE_END, | |
252 | }; | |
253 | ||
254 | struct ak_def { | |
255 | enum asahi_compass_chipset type; | |
256 | long (*raw_to_gauss)(u16 data); | |
257 | u16 range; | |
258 | u8 ctrl_regs[REGS_END]; | |
259 | u8 ctrl_masks[MASK_END]; | |
260 | u8 ctrl_modes[MODE_END]; | |
261 | u8 data_regs[3]; | |
262 | }; | |
263 | ||
f78c5f96 | 264 | static const struct ak_def ak_def_array[AK_MAX_TYPE] = { |
286f74c2 GG |
265 | { |
266 | .type = AK8975, | |
267 | .raw_to_gauss = ak8975_raw_to_gauss, | |
268 | .range = 4096, | |
269 | .ctrl_regs = { | |
270 | AK8975_REG_ST1, | |
271 | AK8975_REG_ST2, | |
272 | AK8975_REG_CNTL, | |
273 | AK8975_REG_ASAX, | |
274 | AK8975_MAX_REGS}, | |
275 | .ctrl_masks = { | |
276 | AK8975_REG_ST1_DRDY_MASK, | |
277 | AK8975_REG_ST2_HOFL_MASK, | |
278 | AK8975_REG_ST2_DERR_MASK, | |
279 | AK8975_REG_CNTL_MODE_MASK}, | |
280 | .ctrl_modes = { | |
281 | AK8975_REG_CNTL_MODE_POWER_DOWN, | |
282 | AK8975_REG_CNTL_MODE_ONCE, | |
283 | AK8975_REG_CNTL_MODE_SELF_TEST, | |
284 | AK8975_REG_CNTL_MODE_FUSE_ROM}, | |
285 | .data_regs = { | |
286 | AK8975_REG_HXL, | |
287 | AK8975_REG_HYL, | |
288 | AK8975_REG_HZL}, | |
289 | }, | |
290 | { | |
291 | .type = AK8963, | |
57e73a42 | 292 | .raw_to_gauss = ak8963_09911_raw_to_gauss, |
286f74c2 GG |
293 | .range = 8190, |
294 | .ctrl_regs = { | |
295 | AK8975_REG_ST1, | |
296 | AK8975_REG_ST2, | |
297 | AK8975_REG_CNTL, | |
298 | AK8975_REG_ASAX, | |
299 | AK8975_MAX_REGS}, | |
300 | .ctrl_masks = { | |
301 | AK8975_REG_ST1_DRDY_MASK, | |
302 | AK8975_REG_ST2_HOFL_MASK, | |
303 | 0, | |
304 | AK8975_REG_CNTL_MODE_MASK}, | |
305 | .ctrl_modes = { | |
306 | AK8975_REG_CNTL_MODE_POWER_DOWN, | |
307 | AK8975_REG_CNTL_MODE_ONCE, | |
308 | AK8975_REG_CNTL_MODE_SELF_TEST, | |
309 | AK8975_REG_CNTL_MODE_FUSE_ROM}, | |
310 | .data_regs = { | |
311 | AK8975_REG_HXL, | |
312 | AK8975_REG_HYL, | |
313 | AK8975_REG_HZL}, | |
314 | }, | |
57e73a42 GG |
315 | { |
316 | .type = AK09911, | |
317 | .raw_to_gauss = ak8963_09911_raw_to_gauss, | |
318 | .range = 8192, | |
319 | .ctrl_regs = { | |
320 | AK09912_REG_ST1, | |
321 | AK09912_REG_ST2, | |
322 | AK09912_REG_CNTL2, | |
323 | AK09912_REG_ASAX, | |
324 | AK09912_MAX_REGS}, | |
325 | .ctrl_masks = { | |
326 | AK09912_REG_ST1_DRDY_MASK, | |
327 | AK09912_REG_ST2_HOFL_MASK, | |
328 | 0, | |
329 | AK09912_REG_CNTL2_MODE_MASK}, | |
330 | .ctrl_modes = { | |
331 | AK09912_REG_CNTL_MODE_POWER_DOWN, | |
332 | AK09912_REG_CNTL_MODE_ONCE, | |
333 | AK09912_REG_CNTL_MODE_SELF_TEST, | |
334 | AK09912_REG_CNTL_MODE_FUSE_ROM}, | |
335 | .data_regs = { | |
336 | AK09912_REG_HXL, | |
337 | AK09912_REG_HYL, | |
338 | AK09912_REG_HZL}, | |
339 | }, | |
340 | { | |
341 | .type = AK09912, | |
342 | .raw_to_gauss = ak09912_raw_to_gauss, | |
343 | .range = 32752, | |
344 | .ctrl_regs = { | |
345 | AK09912_REG_ST1, | |
346 | AK09912_REG_ST2, | |
347 | AK09912_REG_CNTL2, | |
348 | AK09912_REG_ASAX, | |
349 | AK09912_MAX_REGS}, | |
350 | .ctrl_masks = { | |
351 | AK09912_REG_ST1_DRDY_MASK, | |
352 | AK09912_REG_ST2_HOFL_MASK, | |
353 | 0, | |
354 | AK09912_REG_CNTL2_MODE_MASK}, | |
355 | .ctrl_modes = { | |
356 | AK09912_REG_CNTL_MODE_POWER_DOWN, | |
357 | AK09912_REG_CNTL_MODE_ONCE, | |
358 | AK09912_REG_CNTL_MODE_SELF_TEST, | |
359 | AK09912_REG_CNTL_MODE_FUSE_ROM}, | |
360 | .data_regs = { | |
361 | AK09912_REG_HXL, | |
362 | AK09912_REG_HYL, | |
363 | AK09912_REG_HZL}, | |
364 | } | |
6027c077 | 365 | }; |
3285aae1 AC |
366 | |
367 | /* | |
368 | * Per-instance context data for the device. | |
369 | */ | |
370 | struct ak8975_data { | |
371 | struct i2c_client *client; | |
f78c5f96 | 372 | const struct ak_def *def; |
3285aae1 AC |
373 | struct mutex lock; |
374 | u8 asa[3]; | |
375 | long raw_to_gauss[3]; | |
3285aae1 | 376 | int eoc_gpio; |
94a6d5cf JA |
377 | int eoc_irq; |
378 | wait_queue_head_t data_ready_queue; | |
379 | unsigned long flags; | |
286f74c2 | 380 | u8 cntl_cache; |
97eacb91 | 381 | struct iio_mount_matrix orientation; |
a9b72c90 | 382 | struct regulator *vdd; |
b21d3f34 | 383 | struct regulator *vid; |
694e1b5f JC |
384 | }; |
385 | ||
a9b72c90 | 386 | /* Enable attached power regulator if any. */ |
9e6c16d9 | 387 | static int ak8975_power_on(const struct ak8975_data *data) |
a9b72c90 | 388 | { |
a9b72c90 GB |
389 | int ret; |
390 | ||
9e6c16d9 | 391 | ret = regulator_enable(data->vdd); |
90e96fdd | 392 | if (ret) { |
9e6c16d9 | 393 | dev_warn(&data->client->dev, |
90e96fdd LW |
394 | "Failed to enable specified Vdd supply\n"); |
395 | return ret; | |
396 | } | |
9e6c16d9 | 397 | ret = regulator_enable(data->vid); |
b21d3f34 | 398 | if (ret) { |
9e6c16d9 | 399 | dev_warn(&data->client->dev, |
b21d3f34 LW |
400 | "Failed to enable specified Vid supply\n"); |
401 | return ret; | |
402 | } | |
b1037c1a LW |
403 | /* |
404 | * According to the datasheet the power supply rise time i 200us | |
405 | * and the minimum wait time before mode setting is 100us, in | |
406 | * total 300 us. Add some margin and say minimum 500us here. | |
407 | */ | |
408 | usleep_range(500, 1000); | |
b21d3f34 | 409 | return 0; |
a9b72c90 GB |
410 | } |
411 | ||
412 | /* Disable attached power regulator if any. */ | |
9e6c16d9 | 413 | static void ak8975_power_off(const struct ak8975_data *data) |
a9b72c90 | 414 | { |
b21d3f34 | 415 | regulator_disable(data->vid); |
90e96fdd | 416 | regulator_disable(data->vdd); |
a9b72c90 GB |
417 | } |
418 | ||
57e73a42 GG |
419 | /* |
420 | * Return 0 if the i2c device is the one we expect. | |
421 | * return a negative error number otherwise | |
422 | */ | |
423 | static int ak8975_who_i_am(struct i2c_client *client, | |
424 | enum asahi_compass_chipset type) | |
425 | { | |
426 | u8 wia_val[2]; | |
427 | int ret; | |
428 | ||
429 | /* | |
430 | * Signature for each device: | |
431 | * Device | WIA1 | WIA2 | |
432 | * AK09912 | DEVICE_ID | AK09912_DEVICE_ID | |
433 | * AK09911 | DEVICE_ID | AK09911_DEVICE_ID | |
434 | * AK8975 | DEVICE_ID | NA | |
435 | * AK8963 | DEVICE_ID | NA | |
436 | */ | |
a8175ba3 CDL |
437 | ret = i2c_smbus_read_i2c_block_data_or_emulated( |
438 | client, AK09912_REG_WIA1, 2, wia_val); | |
57e73a42 GG |
439 | if (ret < 0) { |
440 | dev_err(&client->dev, "Error reading WIA\n"); | |
441 | return ret; | |
442 | } | |
443 | ||
444 | if (wia_val[0] != AK8975_DEVICE_ID) | |
445 | return -ENODEV; | |
446 | ||
447 | switch (type) { | |
448 | case AK8975: | |
449 | case AK8963: | |
450 | return 0; | |
451 | case AK09911: | |
452 | if (wia_val[1] == AK09911_DEVICE_ID) | |
453 | return 0; | |
454 | break; | |
455 | case AK09912: | |
456 | if (wia_val[1] == AK09912_DEVICE_ID) | |
457 | return 0; | |
458 | break; | |
459 | default: | |
460 | dev_err(&client->dev, "Type %d unknown\n", type); | |
461 | } | |
462 | return -ENODEV; | |
463 | } | |
464 | ||
3285aae1 | 465 | /* |
286f74c2 | 466 | * Helper function to write to CNTL register. |
3285aae1 | 467 | */ |
286f74c2 | 468 | static int ak8975_set_mode(struct ak8975_data *data, enum ak_ctrl_mode mode) |
3285aae1 | 469 | { |
694e1b5f JC |
470 | u8 regval; |
471 | int ret; | |
3285aae1 | 472 | |
286f74c2 GG |
473 | regval = (data->cntl_cache & ~data->def->ctrl_masks[CNTL_MODE]) | |
474 | data->def->ctrl_modes[mode]; | |
475 | ret = i2c_smbus_write_byte_data(data->client, | |
476 | data->def->ctrl_regs[CNTL], regval); | |
3285aae1 | 477 | if (ret < 0) { |
3285aae1 AC |
478 | return ret; |
479 | } | |
286f74c2 GG |
480 | data->cntl_cache = regval; |
481 | /* After mode change wait atleast 100us */ | |
482 | usleep_range(100, 500); | |
3285aae1 AC |
483 | |
484 | return 0; | |
485 | } | |
486 | ||
94a6d5cf JA |
487 | /* |
488 | * Handle data ready irq | |
489 | */ | |
490 | static irqreturn_t ak8975_irq_handler(int irq, void *data) | |
491 | { | |
492 | struct ak8975_data *ak8975 = data; | |
493 | ||
494 | set_bit(0, &ak8975->flags); | |
495 | wake_up(&ak8975->data_ready_queue); | |
496 | ||
497 | return IRQ_HANDLED; | |
498 | } | |
499 | ||
500 | /* | |
501 | * Install data ready interrupt handler | |
502 | */ | |
503 | static int ak8975_setup_irq(struct ak8975_data *data) | |
504 | { | |
505 | struct i2c_client *client = data->client; | |
506 | int rc; | |
507 | int irq; | |
508 | ||
07d2390e KK |
509 | init_waitqueue_head(&data->data_ready_queue); |
510 | clear_bit(0, &data->flags); | |
94a6d5cf JA |
511 | if (client->irq) |
512 | irq = client->irq; | |
513 | else | |
514 | irq = gpio_to_irq(data->eoc_gpio); | |
515 | ||
a845a3aa | 516 | rc = devm_request_irq(&client->dev, irq, ak8975_irq_handler, |
71222bf5 GG |
517 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
518 | dev_name(&client->dev), data); | |
94a6d5cf JA |
519 | if (rc < 0) { |
520 | dev_err(&client->dev, | |
521 | "irq %d request failed, (gpio %d): %d\n", | |
522 | irq, data->eoc_gpio, rc); | |
523 | return rc; | |
524 | } | |
525 | ||
94a6d5cf JA |
526 | data->eoc_irq = irq; |
527 | ||
528 | return rc; | |
529 | } | |
530 | ||
531 | ||
3285aae1 AC |
532 | /* |
533 | * Perform some start-of-day setup, including reading the asa calibration | |
534 | * values and caching them. | |
535 | */ | |
536 | static int ak8975_setup(struct i2c_client *client) | |
537 | { | |
40f32d93 PC |
538 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
539 | struct ak8975_data *data = iio_priv(indio_dev); | |
3285aae1 AC |
540 | int ret; |
541 | ||
3285aae1 | 542 | /* Write the fused rom access mode. */ |
286f74c2 | 543 | ret = ak8975_set_mode(data, FUSE_ROM); |
3285aae1 AC |
544 | if (ret < 0) { |
545 | dev_err(&client->dev, "Error in setting fuse access mode\n"); | |
546 | return ret; | |
547 | } | |
548 | ||
549 | /* Get asa data and store in the device data. */ | |
a8175ba3 CDL |
550 | ret = i2c_smbus_read_i2c_block_data_or_emulated( |
551 | client, data->def->ctrl_regs[ASA_BASE], | |
552 | 3, data->asa); | |
3285aae1 AC |
553 | if (ret < 0) { |
554 | dev_err(&client->dev, "Not able to read asa data\n"); | |
555 | return ret; | |
556 | } | |
557 | ||
040f3e58 | 558 | /* After reading fuse ROM data set power-down mode */ |
286f74c2 | 559 | ret = ak8975_set_mode(data, POWER_DOWN); |
71222bf5 GG |
560 | if (ret < 0) { |
561 | dev_err(&client->dev, "Error in setting power-down mode\n"); | |
562 | return ret; | |
563 | } | |
94a6d5cf | 564 | |
71222bf5 | 565 | if (data->eoc_gpio > 0 || client->irq > 0) { |
94a6d5cf JA |
566 | ret = ak8975_setup_irq(data); |
567 | if (ret < 0) { | |
568 | dev_err(&client->dev, | |
569 | "Error setting data ready interrupt\n"); | |
570 | return ret; | |
571 | } | |
572 | } | |
573 | ||
286f74c2 GG |
574 | data->raw_to_gauss[0] = data->def->raw_to_gauss(data->asa[0]); |
575 | data->raw_to_gauss[1] = data->def->raw_to_gauss(data->asa[1]); | |
576 | data->raw_to_gauss[2] = data->def->raw_to_gauss(data->asa[2]); | |
3285aae1 AC |
577 | |
578 | return 0; | |
579 | } | |
580 | ||
01fbb478 AC |
581 | static int wait_conversion_complete_gpio(struct ak8975_data *data) |
582 | { | |
583 | struct i2c_client *client = data->client; | |
01fbb478 AC |
584 | u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT; |
585 | int ret; | |
586 | ||
587 | /* Wait for the conversion to complete. */ | |
588 | while (timeout_ms) { | |
589 | msleep(AK8975_CONVERSION_DONE_POLL_TIME); | |
590 | if (gpio_get_value(data->eoc_gpio)) | |
591 | break; | |
592 | timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME; | |
593 | } | |
594 | if (!timeout_ms) { | |
595 | dev_err(&client->dev, "Conversion timeout happened\n"); | |
596 | return -EINVAL; | |
597 | } | |
598 | ||
286f74c2 | 599 | ret = i2c_smbus_read_byte_data(client, data->def->ctrl_regs[ST1]); |
c411f600 | 600 | if (ret < 0) |
01fbb478 | 601 | dev_err(&client->dev, "Error in reading ST1\n"); |
c411f600 JC |
602 | |
603 | return ret; | |
01fbb478 AC |
604 | } |
605 | ||
606 | static int wait_conversion_complete_polled(struct ak8975_data *data) | |
607 | { | |
608 | struct i2c_client *client = data->client; | |
609 | u8 read_status; | |
610 | u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT; | |
611 | int ret; | |
612 | ||
613 | /* Wait for the conversion to complete. */ | |
614 | while (timeout_ms) { | |
615 | msleep(AK8975_CONVERSION_DONE_POLL_TIME); | |
286f74c2 GG |
616 | ret = i2c_smbus_read_byte_data(client, |
617 | data->def->ctrl_regs[ST1]); | |
01fbb478 AC |
618 | if (ret < 0) { |
619 | dev_err(&client->dev, "Error in reading ST1\n"); | |
620 | return ret; | |
621 | } | |
c411f600 | 622 | read_status = ret; |
01fbb478 AC |
623 | if (read_status) |
624 | break; | |
625 | timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME; | |
626 | } | |
627 | if (!timeout_ms) { | |
628 | dev_err(&client->dev, "Conversion timeout happened\n"); | |
629 | return -EINVAL; | |
630 | } | |
94a6d5cf | 631 | |
01fbb478 AC |
632 | return read_status; |
633 | } | |
634 | ||
94a6d5cf JA |
635 | /* Returns 0 if the end of conversion interrupt occured or -ETIME otherwise */ |
636 | static int wait_conversion_complete_interrupt(struct ak8975_data *data) | |
637 | { | |
638 | int ret; | |
639 | ||
640 | ret = wait_event_timeout(data->data_ready_queue, | |
641 | test_bit(0, &data->flags), | |
642 | AK8975_DATA_READY_TIMEOUT); | |
643 | clear_bit(0, &data->flags); | |
644 | ||
645 | return ret > 0 ? 0 : -ETIME; | |
646 | } | |
647 | ||
bc11ca4a GB |
648 | static int ak8975_start_read_axis(struct ak8975_data *data, |
649 | const struct i2c_client *client) | |
3285aae1 | 650 | { |
3285aae1 | 651 | /* Set up the device for taking a sample. */ |
bc11ca4a GB |
652 | int ret = ak8975_set_mode(data, MODE_ONCE); |
653 | ||
3285aae1 AC |
654 | if (ret < 0) { |
655 | dev_err(&client->dev, "Error in setting operating mode\n"); | |
bc11ca4a | 656 | return ret; |
3285aae1 AC |
657 | } |
658 | ||
659 | /* Wait for the conversion to complete. */ | |
94a6d5cf JA |
660 | if (data->eoc_irq) |
661 | ret = wait_conversion_complete_interrupt(data); | |
662 | else if (gpio_is_valid(data->eoc_gpio)) | |
01fbb478 AC |
663 | ret = wait_conversion_complete_gpio(data); |
664 | else | |
665 | ret = wait_conversion_complete_polled(data); | |
666 | if (ret < 0) | |
bc11ca4a | 667 | return ret; |
3285aae1 | 668 | |
94a6d5cf | 669 | /* This will be executed only for non-interrupt based waiting case */ |
286f74c2 GG |
670 | if (ret & data->def->ctrl_masks[ST1_DRDY]) { |
671 | ret = i2c_smbus_read_byte_data(client, | |
672 | data->def->ctrl_regs[ST2]); | |
3285aae1 AC |
673 | if (ret < 0) { |
674 | dev_err(&client->dev, "Error in reading ST2\n"); | |
bc11ca4a | 675 | return ret; |
3285aae1 | 676 | } |
286f74c2 GG |
677 | if (ret & (data->def->ctrl_masks[ST2_DERR] | |
678 | data->def->ctrl_masks[ST2_HOFL])) { | |
c411f600 | 679 | dev_err(&client->dev, "ST2 status error 0x%x\n", ret); |
bc11ca4a | 680 | return -EINVAL; |
3285aae1 AC |
681 | } |
682 | } | |
683 | ||
bc11ca4a GB |
684 | return 0; |
685 | } | |
686 | ||
687 | /* Retrieve raw flux value for one of the x, y, or z axis. */ | |
688 | static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val) | |
689 | { | |
690 | struct ak8975_data *data = iio_priv(indio_dev); | |
691 | const struct i2c_client *client = data->client; | |
692 | const struct ak_def *def = data->def; | |
a8175ba3 | 693 | u16 buff; |
bc11ca4a GB |
694 | int ret; |
695 | ||
cde4cb5d LW |
696 | pm_runtime_get_sync(&data->client->dev); |
697 | ||
bc11ca4a GB |
698 | mutex_lock(&data->lock); |
699 | ||
700 | ret = ak8975_start_read_axis(data, client); | |
701 | if (ret) | |
702 | goto exit; | |
703 | ||
a8175ba3 CDL |
704 | ret = i2c_smbus_read_i2c_block_data_or_emulated( |
705 | client, def->data_regs[index], | |
706 | sizeof(buff), (u8*)&buff); | |
bc11ca4a | 707 | if (ret < 0) |
3285aae1 | 708 | goto exit; |
3285aae1 AC |
709 | |
710 | mutex_unlock(&data->lock); | |
711 | ||
cde4cb5d LW |
712 | pm_runtime_mark_last_busy(&data->client->dev); |
713 | pm_runtime_put_autosuspend(&data->client->dev); | |
714 | ||
a8175ba3 CDL |
715 | /* Swap bytes and convert to valid range. */ |
716 | buff = le16_to_cpu(buff); | |
717 | *val = clamp_t(s16, buff, -def->range, def->range); | |
694e1b5f | 718 | return IIO_VAL_INT; |
3285aae1 AC |
719 | |
720 | exit: | |
721 | mutex_unlock(&data->lock); | |
bc11ca4a | 722 | dev_err(&client->dev, "Error in reading axis\n"); |
3285aae1 AC |
723 | return ret; |
724 | } | |
725 | ||
694e1b5f JC |
726 | static int ak8975_read_raw(struct iio_dev *indio_dev, |
727 | struct iio_chan_spec const *chan, | |
728 | int *val, int *val2, | |
729 | long mask) | |
730 | { | |
731 | struct ak8975_data *data = iio_priv(indio_dev); | |
732 | ||
733 | switch (mask) { | |
4d9948b3 | 734 | case IIO_CHAN_INFO_RAW: |
694e1b5f | 735 | return ak8975_read_axis(indio_dev, chan->address, val); |
c8a9f805 | 736 | case IIO_CHAN_INFO_SCALE: |
bef44abc BS |
737 | *val = 0; |
738 | *val2 = data->raw_to_gauss[chan->address]; | |
739 | return IIO_VAL_INT_PLUS_MICRO; | |
694e1b5f JC |
740 | } |
741 | return -EINVAL; | |
742 | } | |
743 | ||
97eacb91 GB |
744 | static const struct iio_mount_matrix * |
745 | ak8975_get_mount_matrix(const struct iio_dev *indio_dev, | |
746 | const struct iio_chan_spec *chan) | |
747 | { | |
748 | return &((struct ak8975_data *)iio_priv(indio_dev))->orientation; | |
749 | } | |
750 | ||
751 | static const struct iio_chan_spec_ext_info ak8975_ext_info[] = { | |
752 | IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, ak8975_get_mount_matrix), | |
753 | { }, | |
754 | }; | |
755 | ||
694e1b5f JC |
756 | #define AK8975_CHANNEL(axis, index) \ |
757 | { \ | |
758 | .type = IIO_MAGN, \ | |
759 | .modified = 1, \ | |
760 | .channel2 = IIO_MOD_##axis, \ | |
3a0b4422 JC |
761 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
762 | BIT(IIO_CHAN_INFO_SCALE), \ | |
694e1b5f | 763 | .address = index, \ |
bc11ca4a GB |
764 | .scan_index = index, \ |
765 | .scan_type = { \ | |
766 | .sign = 's', \ | |
767 | .realbits = 16, \ | |
768 | .storagebits = 16, \ | |
769 | .endianness = IIO_CPU \ | |
97eacb91 GB |
770 | }, \ |
771 | .ext_info = ak8975_ext_info, \ | |
694e1b5f JC |
772 | } |
773 | ||
774 | static const struct iio_chan_spec ak8975_channels[] = { | |
775 | AK8975_CHANNEL(X, 0), AK8975_CHANNEL(Y, 1), AK8975_CHANNEL(Z, 2), | |
bc11ca4a | 776 | IIO_CHAN_SOFT_TIMESTAMP(3), |
694e1b5f JC |
777 | }; |
778 | ||
bc11ca4a GB |
779 | static const unsigned long ak8975_scan_masks[] = { 0x7, 0 }; |
780 | ||
6fe8135f | 781 | static const struct iio_info ak8975_info = { |
694e1b5f | 782 | .read_raw = &ak8975_read_raw, |
6fe8135f JC |
783 | .driver_module = THIS_MODULE, |
784 | }; | |
785 | ||
d913971e SP |
786 | static const struct acpi_device_id ak_acpi_match[] = { |
787 | {"AK8975", AK8975}, | |
788 | {"AK8963", AK8963}, | |
789 | {"INVN6500", AK8963}, | |
57e73a42 GG |
790 | {"AK09911", AK09911}, |
791 | {"AK09912", AK09912}, | |
d913971e SP |
792 | { }, |
793 | }; | |
794 | MODULE_DEVICE_TABLE(acpi, ak_acpi_match); | |
795 | ||
48edc374 IT |
796 | static const char *ak8975_match_acpi_device(struct device *dev, |
797 | enum asahi_compass_chipset *chipset) | |
d913971e SP |
798 | { |
799 | const struct acpi_device_id *id; | |
800 | ||
801 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
802 | if (!id) | |
803 | return NULL; | |
804 | *chipset = (int)id->driver_data; | |
805 | ||
48edc374 | 806 | return dev_name(dev); |
d913971e SP |
807 | } |
808 | ||
bc11ca4a GB |
809 | static void ak8975_fill_buffer(struct iio_dev *indio_dev) |
810 | { | |
811 | struct ak8975_data *data = iio_priv(indio_dev); | |
812 | const struct i2c_client *client = data->client; | |
813 | const struct ak_def *def = data->def; | |
814 | int ret; | |
815 | s16 buff[8]; /* 3 x 16 bits axis values + 1 aligned 64 bits timestamp */ | |
816 | ||
817 | mutex_lock(&data->lock); | |
818 | ||
819 | ret = ak8975_start_read_axis(data, client); | |
820 | if (ret) | |
821 | goto unlock; | |
822 | ||
823 | /* | |
824 | * For each axis, read the flux value from the appropriate register | |
825 | * (the register is specified in the iio device attributes). | |
826 | */ | |
827 | ret = i2c_smbus_read_i2c_block_data_or_emulated(client, | |
828 | def->data_regs[0], | |
829 | 3 * sizeof(buff[0]), | |
830 | (u8 *)buff); | |
831 | if (ret < 0) | |
832 | goto unlock; | |
833 | ||
834 | mutex_unlock(&data->lock); | |
835 | ||
836 | /* Clamp to valid range. */ | |
837 | buff[0] = clamp_t(s16, le16_to_cpu(buff[0]), -def->range, def->range); | |
838 | buff[1] = clamp_t(s16, le16_to_cpu(buff[1]), -def->range, def->range); | |
839 | buff[2] = clamp_t(s16, le16_to_cpu(buff[2]), -def->range, def->range); | |
840 | ||
bc2b7dab GB |
841 | iio_push_to_buffers_with_timestamp(indio_dev, buff, |
842 | iio_get_time_ns(indio_dev)); | |
bc11ca4a GB |
843 | return; |
844 | ||
845 | unlock: | |
846 | mutex_unlock(&data->lock); | |
847 | dev_err(&client->dev, "Error in reading axes block\n"); | |
848 | } | |
849 | ||
850 | static irqreturn_t ak8975_handle_trigger(int irq, void *p) | |
851 | { | |
852 | const struct iio_poll_func *pf = p; | |
853 | struct iio_dev *indio_dev = pf->indio_dev; | |
854 | ||
855 | ak8975_fill_buffer(indio_dev); | |
856 | iio_trigger_notify_done(indio_dev->trig); | |
857 | return IRQ_HANDLED; | |
858 | } | |
859 | ||
4ae1c61f | 860 | static int ak8975_probe(struct i2c_client *client, |
3285aae1 AC |
861 | const struct i2c_device_id *id) |
862 | { | |
863 | struct ak8975_data *data; | |
338473c8 JC |
864 | struct iio_dev *indio_dev; |
865 | int eoc_gpio; | |
3285aae1 | 866 | int err; |
48edc374 | 867 | const char *name = NULL; |
05be8d41 | 868 | enum asahi_compass_chipset chipset = AK_MAX_TYPE; |
97eacb91 GB |
869 | const struct ak8975_platform_data *pdata = |
870 | dev_get_platdata(&client->dev); | |
3285aae1 | 871 | |
3285aae1 | 872 | /* Grab and set up the supplied GPIO. */ |
97eacb91 GB |
873 | if (pdata) |
874 | eoc_gpio = pdata->eoc_gpio; | |
f4b7f751 JA |
875 | else if (client->dev.of_node) |
876 | eoc_gpio = of_get_gpio(client->dev.of_node, 0); | |
877 | else | |
878 | eoc_gpio = -1; | |
879 | ||
880 | if (eoc_gpio == -EPROBE_DEFER) | |
881 | return -EPROBE_DEFER; | |
3285aae1 | 882 | |
01fbb478 AC |
883 | /* We may not have a GPIO based IRQ to scan, that is fine, we will |
884 | poll if so */ | |
7c6c9368 | 885 | if (gpio_is_valid(eoc_gpio)) { |
a845a3aa BS |
886 | err = devm_gpio_request_one(&client->dev, eoc_gpio, |
887 | GPIOF_IN, "ak_8975"); | |
01fbb478 AC |
888 | if (err < 0) { |
889 | dev_err(&client->dev, | |
890 | "failed to request GPIO %d, error %d\n", | |
338473c8 | 891 | eoc_gpio, err); |
a845a3aa | 892 | return err; |
01fbb478 | 893 | } |
7c6c9368 | 894 | } |
3285aae1 | 895 | |
338473c8 | 896 | /* Register with IIO */ |
a845a3aa BS |
897 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
898 | if (indio_dev == NULL) | |
899 | return -ENOMEM; | |
900 | ||
338473c8 | 901 | data = iio_priv(indio_dev); |
40f32d93 | 902 | i2c_set_clientdata(client, indio_dev); |
94a6d5cf JA |
903 | |
904 | data->client = client; | |
905 | data->eoc_gpio = eoc_gpio; | |
906 | data->eoc_irq = 0; | |
907 | ||
97eacb91 GB |
908 | if (!pdata) { |
909 | err = of_iio_read_mount_matrix(&client->dev, | |
910 | "mount-matrix", | |
911 | &data->orientation); | |
912 | if (err) | |
913 | return err; | |
914 | } else | |
915 | data->orientation = pdata->orientation; | |
916 | ||
d913971e SP |
917 | /* id will be NULL when enumerated via ACPI */ |
918 | if (id) { | |
286f74c2 | 919 | chipset = (enum asahi_compass_chipset)(id->driver_data); |
48edc374 | 920 | name = id->name; |
55c0c530 | 921 | } else if (ACPI_HANDLE(&client->dev)) { |
286f74c2 | 922 | name = ak8975_match_acpi_device(&client->dev, &chipset); |
55c0c530 GB |
923 | if (!name) |
924 | return -ENODEV; | |
26b89d7d | 925 | } else |
a845a3aa BS |
926 | return -ENOSYS; |
927 | ||
286f74c2 GG |
928 | if (chipset >= AK_MAX_TYPE) { |
929 | dev_err(&client->dev, "AKM device type unsupported: %d\n", | |
930 | chipset); | |
931 | return -ENODEV; | |
932 | } | |
933 | ||
934 | data->def = &ak_def_array[chipset]; | |
a9b72c90 | 935 | |
9e6c16d9 LW |
936 | /* Fetch the regulators */ |
937 | data->vdd = devm_regulator_get(&client->dev, "vdd"); | |
938 | if (IS_ERR(data->vdd)) | |
939 | return PTR_ERR(data->vdd); | |
940 | data->vid = devm_regulator_get(&client->dev, "vid"); | |
941 | if (IS_ERR(data->vid)) | |
942 | return PTR_ERR(data->vid); | |
943 | ||
944 | err = ak8975_power_on(data); | |
a9b72c90 GB |
945 | if (err) |
946 | return err; | |
947 | ||
57e73a42 GG |
948 | err = ak8975_who_i_am(client, data->def->type); |
949 | if (err < 0) { | |
950 | dev_err(&client->dev, "Unexpected device\n"); | |
a9b72c90 | 951 | goto power_off; |
57e73a42 | 952 | } |
d913971e | 953 | dev_dbg(&client->dev, "Asahi compass chip %s\n", name); |
6027c077 | 954 | |
3285aae1 AC |
955 | /* Perform some basic start-of-day setup of the device. */ |
956 | err = ak8975_setup(client); | |
957 | if (err < 0) { | |
71222bf5 | 958 | dev_err(&client->dev, "%s initialization fails\n", name); |
a9b72c90 | 959 | goto power_off; |
3285aae1 AC |
960 | } |
961 | ||
338473c8 | 962 | mutex_init(&data->lock); |
338473c8 | 963 | indio_dev->dev.parent = &client->dev; |
694e1b5f JC |
964 | indio_dev->channels = ak8975_channels; |
965 | indio_dev->num_channels = ARRAY_SIZE(ak8975_channels); | |
338473c8 | 966 | indio_dev->info = &ak8975_info; |
bc11ca4a | 967 | indio_dev->available_scan_masks = ak8975_scan_masks; |
338473c8 | 968 | indio_dev->modes = INDIO_DIRECT_MODE; |
d913971e | 969 | indio_dev->name = name; |
a9b72c90 | 970 | |
bc11ca4a GB |
971 | err = iio_triggered_buffer_setup(indio_dev, NULL, ak8975_handle_trigger, |
972 | NULL); | |
973 | if (err) { | |
974 | dev_err(&client->dev, "triggered buffer setup failed\n"); | |
a9b72c90 | 975 | goto power_off; |
bc11ca4a GB |
976 | } |
977 | ||
978 | err = iio_device_register(indio_dev); | |
979 | if (err) { | |
980 | dev_err(&client->dev, "device register failed\n"); | |
981 | goto cleanup_buffer; | |
982 | } | |
a9b72c90 | 983 | |
cde4cb5d LW |
984 | /* Enable runtime PM */ |
985 | pm_runtime_get_noresume(&client->dev); | |
986 | pm_runtime_set_active(&client->dev); | |
987 | pm_runtime_enable(&client->dev); | |
988 | /* | |
989 | * The device comes online in 500us, so add two orders of magnitude | |
990 | * of delay before autosuspending: 50 ms. | |
991 | */ | |
992 | pm_runtime_set_autosuspend_delay(&client->dev, 50); | |
993 | pm_runtime_use_autosuspend(&client->dev); | |
994 | pm_runtime_put(&client->dev); | |
995 | ||
a9b72c90 GB |
996 | return 0; |
997 | ||
bc11ca4a GB |
998 | cleanup_buffer: |
999 | iio_triggered_buffer_cleanup(indio_dev); | |
a9b72c90 | 1000 | power_off: |
9e6c16d9 | 1001 | ak8975_power_off(data); |
a9b72c90 GB |
1002 | return err; |
1003 | } | |
1004 | ||
1005 | static int ak8975_remove(struct i2c_client *client) | |
1006 | { | |
1007 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
9e6c16d9 | 1008 | struct ak8975_data *data = iio_priv(indio_dev); |
a9b72c90 | 1009 | |
cde4cb5d LW |
1010 | pm_runtime_get_sync(&client->dev); |
1011 | pm_runtime_put_noidle(&client->dev); | |
1012 | pm_runtime_disable(&client->dev); | |
a9b72c90 | 1013 | iio_device_unregister(indio_dev); |
bc11ca4a | 1014 | iio_triggered_buffer_cleanup(indio_dev); |
8d06cd25 | 1015 | ak8975_set_mode(data, POWER_DOWN); |
9e6c16d9 | 1016 | ak8975_power_off(data); |
a9b72c90 GB |
1017 | |
1018 | return 0; | |
3285aae1 AC |
1019 | } |
1020 | ||
cde4cb5d LW |
1021 | #ifdef CONFIG_PM |
1022 | static int ak8975_runtime_suspend(struct device *dev) | |
1023 | { | |
1024 | struct i2c_client *client = to_i2c_client(dev); | |
1025 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
1026 | struct ak8975_data *data = iio_priv(indio_dev); | |
1027 | int ret; | |
1028 | ||
1029 | /* Set the device in power down if it wasn't already */ | |
1030 | ret = ak8975_set_mode(data, POWER_DOWN); | |
1031 | if (ret < 0) { | |
1032 | dev_err(&client->dev, "Error in setting power-down mode\n"); | |
1033 | return ret; | |
1034 | } | |
1035 | /* Next cut the regulators */ | |
1036 | ak8975_power_off(data); | |
1037 | ||
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | static int ak8975_runtime_resume(struct device *dev) | |
1042 | { | |
1043 | struct i2c_client *client = to_i2c_client(dev); | |
1044 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
1045 | struct ak8975_data *data = iio_priv(indio_dev); | |
1046 | int ret; | |
1047 | ||
1048 | /* Take up the regulators */ | |
1049 | ak8975_power_on(data); | |
1050 | /* | |
1051 | * We come up in powered down mode, the reading routines will | |
1052 | * put us in the mode to read values later. | |
1053 | */ | |
1054 | ret = ak8975_set_mode(data, POWER_DOWN); | |
1055 | if (ret < 0) { | |
1056 | dev_err(&client->dev, "Error in setting power-down mode\n"); | |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | #endif /* CONFIG_PM */ | |
1063 | ||
1064 | static const struct dev_pm_ops ak8975_dev_pm_ops = { | |
1065 | SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, | |
1066 | pm_runtime_force_resume) | |
1067 | SET_RUNTIME_PM_OPS(ak8975_runtime_suspend, | |
1068 | ak8975_runtime_resume, NULL) | |
1069 | }; | |
1070 | ||
3285aae1 | 1071 | static const struct i2c_device_id ak8975_id[] = { |
6027c077 SP |
1072 | {"ak8975", AK8975}, |
1073 | {"ak8963", AK8963}, | |
2d8339d0 | 1074 | {"AK8963", AK8963}, |
57e73a42 GG |
1075 | {"ak09911", AK09911}, |
1076 | {"ak09912", AK09912}, | |
3285aae1 AC |
1077 | {} |
1078 | }; | |
1079 | ||
1080 | MODULE_DEVICE_TABLE(i2c, ak8975_id); | |
1081 | ||
54461c30 OJ |
1082 | static const struct of_device_id ak8975_of_match[] = { |
1083 | { .compatible = "asahi-kasei,ak8975", }, | |
1084 | { .compatible = "ak8975", }, | |
286f74c2 GG |
1085 | { .compatible = "asahi-kasei,ak8963", }, |
1086 | { .compatible = "ak8963", }, | |
57e73a42 GG |
1087 | { .compatible = "asahi-kasei,ak09911", }, |
1088 | { .compatible = "ak09911", }, | |
1089 | { .compatible = "asahi-kasei,ak09912", }, | |
1090 | { .compatible = "ak09912", }, | |
286f74c2 | 1091 | {} |
54461c30 OJ |
1092 | }; |
1093 | MODULE_DEVICE_TABLE(of, ak8975_of_match); | |
1094 | ||
3285aae1 AC |
1095 | static struct i2c_driver ak8975_driver = { |
1096 | .driver = { | |
1097 | .name = "ak8975", | |
cde4cb5d | 1098 | .pm = &ak8975_dev_pm_ops, |
71222bf5 | 1099 | .of_match_table = of_match_ptr(ak8975_of_match), |
d913971e | 1100 | .acpi_match_table = ACPI_PTR(ak_acpi_match), |
3285aae1 AC |
1101 | }, |
1102 | .probe = ak8975_probe, | |
a9b72c90 | 1103 | .remove = ak8975_remove, |
3285aae1 AC |
1104 | .id_table = ak8975_id, |
1105 | }; | |
6e5af184 | 1106 | module_i2c_driver(ak8975_driver); |
3285aae1 AC |
1107 | |
1108 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
1109 | MODULE_DESCRIPTION("AK8975 magnetometer driver"); | |
1110 | MODULE_LICENSE("GPL"); |