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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7c94a8b2 LW |
2 | /* |
3 | * Driver for the Asahi Kasei EMD Corporation AK8974 | |
4 | * and Aichi Steel AMI305 magnetometer chips. | |
5 | * Based on a patch from Samu Onkalo and the AK8975 IIO driver. | |
6 | * | |
7 | * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). | |
8 | * Copyright (c) 2010 NVIDIA Corporation. | |
9 | * Copyright (C) 2016 Linaro Ltd. | |
10 | * | |
11 | * Author: Samu Onkalo <samu.p.onkalo@nokia.com> | |
12 | * Author: Linus Walleij <linus.walleij@linaro.org> | |
13 | */ | |
14 | #include <linux/module.h> | |
2b4f0172 | 15 | #include <linux/mod_devicetable.h> |
7c94a8b2 LW |
16 | #include <linux/kernel.h> |
17 | #include <linux/i2c.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/irq.h> /* For irq_get_irq_data() */ | |
20 | #include <linux/completion.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/mutex.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/bitops.h> | |
408cc6eb | 25 | #include <linux/random.h> |
7c94a8b2 LW |
26 | #include <linux/regmap.h> |
27 | #include <linux/regulator/consumer.h> | |
28 | #include <linux/pm_runtime.h> | |
29 | ||
30 | #include <linux/iio/iio.h> | |
31 | #include <linux/iio/sysfs.h> | |
32 | #include <linux/iio/buffer.h> | |
33 | #include <linux/iio/trigger.h> | |
34 | #include <linux/iio/trigger_consumer.h> | |
35 | #include <linux/iio/triggered_buffer.h> | |
36 | ||
37 | /* | |
38 | * 16-bit registers are little-endian. LSB is at the address defined below | |
39 | * and MSB is at the next higher address. | |
40 | */ | |
41 | ||
21be26fc | 42 | /* These registers are common for AK8974 and AMI30x */ |
7c94a8b2 LW |
43 | #define AK8974_SELFTEST 0x0C |
44 | #define AK8974_SELFTEST_IDLE 0x55 | |
45 | #define AK8974_SELFTEST_OK 0xAA | |
46 | ||
47 | #define AK8974_INFO 0x0D | |
48 | ||
49 | #define AK8974_WHOAMI 0x0F | |
21be26fc | 50 | #define AK8974_WHOAMI_VALUE_AMI306 0x46 |
7c94a8b2 LW |
51 | #define AK8974_WHOAMI_VALUE_AMI305 0x47 |
52 | #define AK8974_WHOAMI_VALUE_AK8974 0x48 | |
525530af | 53 | #define AK8974_WHOAMI_VALUE_HSCDTD008A 0x49 |
7c94a8b2 LW |
54 | |
55 | #define AK8974_DATA_X 0x10 | |
56 | #define AK8974_DATA_Y 0x12 | |
57 | #define AK8974_DATA_Z 0x14 | |
58 | #define AK8974_INT_SRC 0x16 | |
59 | #define AK8974_STATUS 0x18 | |
60 | #define AK8974_INT_CLEAR 0x1A | |
61 | #define AK8974_CTRL1 0x1B | |
62 | #define AK8974_CTRL2 0x1C | |
63 | #define AK8974_CTRL3 0x1D | |
64 | #define AK8974_INT_CTRL 0x1E | |
65 | #define AK8974_INT_THRES 0x26 /* Absolute any axis value threshold */ | |
66 | #define AK8974_PRESET 0x30 | |
67 | ||
68 | /* AK8974-specific offsets */ | |
69 | #define AK8974_OFFSET_X 0x20 | |
70 | #define AK8974_OFFSET_Y 0x22 | |
71 | #define AK8974_OFFSET_Z 0x24 | |
72 | /* AMI305-specific offsets */ | |
73 | #define AMI305_OFFSET_X 0x6C | |
74 | #define AMI305_OFFSET_Y 0x72 | |
75 | #define AMI305_OFFSET_Z 0x78 | |
76 | ||
77 | /* Different temperature registers */ | |
78 | #define AK8974_TEMP 0x31 | |
79 | #define AMI305_TEMP 0x60 | |
80 | ||
21be26fc MM |
81 | /* AMI306-specific control register */ |
82 | #define AMI306_CTRL4 0x5C | |
83 | ||
84 | /* AMI306 factory calibration data */ | |
85 | ||
86 | /* fine axis sensitivity */ | |
87 | #define AMI306_FINEOUTPUT_X 0x90 | |
88 | #define AMI306_FINEOUTPUT_Y 0x92 | |
89 | #define AMI306_FINEOUTPUT_Z 0x94 | |
90 | ||
91 | /* axis sensitivity */ | |
92 | #define AMI306_SENS_X 0x96 | |
93 | #define AMI306_SENS_Y 0x98 | |
94 | #define AMI306_SENS_Z 0x9A | |
95 | ||
96 | /* axis cross-interference */ | |
97 | #define AMI306_GAIN_PARA_XZ 0x9C | |
98 | #define AMI306_GAIN_PARA_XY 0x9D | |
99 | #define AMI306_GAIN_PARA_YZ 0x9E | |
100 | #define AMI306_GAIN_PARA_YX 0x9F | |
101 | #define AMI306_GAIN_PARA_ZY 0xA0 | |
102 | #define AMI306_GAIN_PARA_ZX 0xA1 | |
103 | ||
104 | /* offset at ZERO magnetic field */ | |
105 | #define AMI306_OFFZERO_X 0xF8 | |
106 | #define AMI306_OFFZERO_Y 0xFA | |
107 | #define AMI306_OFFZERO_Z 0xFC | |
108 | ||
109 | ||
7c94a8b2 LW |
110 | #define AK8974_INT_X_HIGH BIT(7) /* Axis over +threshold */ |
111 | #define AK8974_INT_Y_HIGH BIT(6) | |
112 | #define AK8974_INT_Z_HIGH BIT(5) | |
113 | #define AK8974_INT_X_LOW BIT(4) /* Axis below -threshold */ | |
114 | #define AK8974_INT_Y_LOW BIT(3) | |
115 | #define AK8974_INT_Z_LOW BIT(2) | |
116 | #define AK8974_INT_RANGE BIT(1) /* Range overflow (any axis) */ | |
117 | ||
118 | #define AK8974_STATUS_DRDY BIT(6) /* Data ready */ | |
119 | #define AK8974_STATUS_OVERRUN BIT(5) /* Data overrun */ | |
120 | #define AK8974_STATUS_INT BIT(4) /* Interrupt occurred */ | |
121 | ||
122 | #define AK8974_CTRL1_POWER BIT(7) /* 0 = standby; 1 = active */ | |
123 | #define AK8974_CTRL1_RATE BIT(4) /* 0 = 10 Hz; 1 = 20 Hz */ | |
124 | #define AK8974_CTRL1_FORCE_EN BIT(1) /* 0 = normal; 1 = force */ | |
125 | #define AK8974_CTRL1_MODE2 BIT(0) /* 0 */ | |
126 | ||
127 | #define AK8974_CTRL2_INT_EN BIT(4) /* 1 = enable interrupts */ | |
128 | #define AK8974_CTRL2_DRDY_EN BIT(3) /* 1 = enable data ready signal */ | |
129 | #define AK8974_CTRL2_DRDY_POL BIT(2) /* 1 = data ready active high */ | |
130 | #define AK8974_CTRL2_RESDEF (AK8974_CTRL2_DRDY_POL) | |
131 | ||
132 | #define AK8974_CTRL3_RESET BIT(7) /* Software reset */ | |
133 | #define AK8974_CTRL3_FORCE BIT(6) /* Start forced measurement */ | |
134 | #define AK8974_CTRL3_SELFTEST BIT(4) /* Set selftest register */ | |
135 | #define AK8974_CTRL3_RESDEF 0x00 | |
136 | ||
137 | #define AK8974_INT_CTRL_XEN BIT(7) /* Enable interrupt for this axis */ | |
138 | #define AK8974_INT_CTRL_YEN BIT(6) | |
139 | #define AK8974_INT_CTRL_ZEN BIT(5) | |
140 | #define AK8974_INT_CTRL_XYZEN (BIT(7)|BIT(6)|BIT(5)) | |
141 | #define AK8974_INT_CTRL_POL BIT(3) /* 0 = active low; 1 = active high */ | |
142 | #define AK8974_INT_CTRL_PULSE BIT(1) /* 0 = latched; 1 = pulse (50 usec) */ | |
143 | #define AK8974_INT_CTRL_RESDEF (AK8974_INT_CTRL_XYZEN | AK8974_INT_CTRL_POL) | |
144 | ||
525530af NR |
145 | /* HSCDTD008A-specific control register */ |
146 | #define HSCDTD008A_CTRL4 0x1E | |
147 | #define HSCDTD008A_CTRL4_MMD BIT(7) /* must be set to 1 */ | |
148 | #define HSCDTD008A_CTRL4_RANGE BIT(4) /* 0 = 14-bit output; 1 = 15-bit output */ | |
149 | #define HSCDTD008A_CTRL4_RESDEF (HSCDTD008A_CTRL4_MMD | HSCDTD008A_CTRL4_RANGE) | |
150 | ||
7c94a8b2 LW |
151 | /* The AMI305 has elaborate FW version and serial number registers */ |
152 | #define AMI305_VER 0xE8 | |
153 | #define AMI305_SN 0xEA | |
154 | ||
155 | #define AK8974_MAX_RANGE 2048 | |
156 | ||
157 | #define AK8974_POWERON_DELAY 50 | |
158 | #define AK8974_ACTIVATE_DELAY 1 | |
159 | #define AK8974_SELFTEST_DELAY 1 | |
160 | /* | |
161 | * Set the autosuspend to two orders of magnitude larger than the poweron | |
162 | * delay to make sane reasonable power tradeoff savings (5 seconds in | |
163 | * this case). | |
164 | */ | |
165 | #define AK8974_AUTOSUSPEND_DELAY 5000 | |
166 | ||
167 | #define AK8974_MEASTIME 3 | |
168 | ||
169 | #define AK8974_PWR_ON 1 | |
170 | #define AK8974_PWR_OFF 0 | |
171 | ||
172 | /** | |
173 | * struct ak8974 - state container for the AK8974 driver | |
174 | * @i2c: parent I2C client | |
175 | * @orientation: mounting matrix, flipped axis etc | |
176 | * @map: regmap to access the AK8974 registers over I2C | |
177 | * @regs: the avdd and dvdd power regulators | |
178 | * @name: the name of the part | |
179 | * @variant: the whoami ID value (for selecting code paths) | |
180 | * @lock: locks the magnetometer for exclusive use during a measurement | |
181 | * @drdy_irq: uses the DRDY IRQ line | |
182 | * @drdy_complete: completion for DRDY | |
183 | * @drdy_active_low: the DRDY IRQ is active low | |
5497523e | 184 | * @scan: timestamps |
7c94a8b2 LW |
185 | */ |
186 | struct ak8974 { | |
187 | struct i2c_client *i2c; | |
188 | struct iio_mount_matrix orientation; | |
189 | struct regmap *map; | |
190 | struct regulator_bulk_data regs[2]; | |
191 | const char *name; | |
192 | u8 variant; | |
193 | struct mutex lock; | |
194 | bool drdy_irq; | |
195 | struct completion drdy_complete; | |
196 | bool drdy_active_low; | |
838e00b1 JC |
197 | /* Ensure timestamp is naturally aligned */ |
198 | struct { | |
199 | __le16 channels[3]; | |
200 | s64 ts __aligned(8); | |
201 | } scan; | |
7c94a8b2 LW |
202 | }; |
203 | ||
204 | static const char ak8974_reg_avdd[] = "avdd"; | |
205 | static const char ak8974_reg_dvdd[] = "dvdd"; | |
206 | ||
21be26fc MM |
207 | static int ak8974_get_u16_val(struct ak8974 *ak8974, u8 reg, u16 *val) |
208 | { | |
209 | int ret; | |
210 | __le16 bulk; | |
211 | ||
212 | ret = regmap_bulk_read(ak8974->map, reg, &bulk, 2); | |
213 | if (ret) | |
214 | return ret; | |
215 | *val = le16_to_cpu(bulk); | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int ak8974_set_u16_val(struct ak8974 *ak8974, u8 reg, u16 val) | |
221 | { | |
222 | __le16 bulk = cpu_to_le16(val); | |
223 | ||
224 | return regmap_bulk_write(ak8974->map, reg, &bulk, 2); | |
225 | } | |
226 | ||
7c94a8b2 LW |
227 | static int ak8974_set_power(struct ak8974 *ak8974, bool mode) |
228 | { | |
229 | int ret; | |
230 | u8 val; | |
231 | ||
232 | val = mode ? AK8974_CTRL1_POWER : 0; | |
233 | val |= AK8974_CTRL1_FORCE_EN; | |
234 | ret = regmap_write(ak8974->map, AK8974_CTRL1, val); | |
235 | if (ret < 0) | |
236 | return ret; | |
237 | ||
238 | if (mode) | |
239 | msleep(AK8974_ACTIVATE_DELAY); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int ak8974_reset(struct ak8974 *ak8974) | |
245 | { | |
246 | int ret; | |
247 | ||
248 | /* Power on to get register access. Sets CTRL1 reg to reset state */ | |
249 | ret = ak8974_set_power(ak8974, AK8974_PWR_ON); | |
250 | if (ret) | |
251 | return ret; | |
252 | ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_RESDEF); | |
253 | if (ret) | |
254 | return ret; | |
255 | ret = regmap_write(ak8974->map, AK8974_CTRL3, AK8974_CTRL3_RESDEF); | |
256 | if (ret) | |
257 | return ret; | |
525530af NR |
258 | if (ak8974->variant != AK8974_WHOAMI_VALUE_HSCDTD008A) { |
259 | ret = regmap_write(ak8974->map, AK8974_INT_CTRL, | |
260 | AK8974_INT_CTRL_RESDEF); | |
261 | if (ret) | |
262 | return ret; | |
263 | } else { | |
264 | ret = regmap_write(ak8974->map, HSCDTD008A_CTRL4, | |
265 | HSCDTD008A_CTRL4_RESDEF); | |
266 | if (ret) | |
267 | return ret; | |
268 | } | |
7c94a8b2 LW |
269 | |
270 | /* After reset, power off is default state */ | |
271 | return ak8974_set_power(ak8974, AK8974_PWR_OFF); | |
272 | } | |
273 | ||
274 | static int ak8974_configure(struct ak8974 *ak8974) | |
275 | { | |
276 | int ret; | |
277 | ||
278 | ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_DRDY_EN | | |
279 | AK8974_CTRL2_INT_EN); | |
280 | if (ret) | |
281 | return ret; | |
282 | ret = regmap_write(ak8974->map, AK8974_CTRL3, 0); | |
283 | if (ret) | |
284 | return ret; | |
21be26fc MM |
285 | if (ak8974->variant == AK8974_WHOAMI_VALUE_AMI306) { |
286 | /* magic from datasheet: set high-speed measurement mode */ | |
287 | ret = ak8974_set_u16_val(ak8974, AMI306_CTRL4, 0xA07E); | |
288 | if (ret) | |
289 | return ret; | |
290 | } | |
525530af NR |
291 | if (ak8974->variant == AK8974_WHOAMI_VALUE_HSCDTD008A) |
292 | return 0; | |
7c94a8b2 LW |
293 | ret = regmap_write(ak8974->map, AK8974_INT_CTRL, AK8974_INT_CTRL_POL); |
294 | if (ret) | |
295 | return ret; | |
296 | ||
297 | return regmap_write(ak8974->map, AK8974_PRESET, 0); | |
298 | } | |
299 | ||
300 | static int ak8974_trigmeas(struct ak8974 *ak8974) | |
301 | { | |
302 | unsigned int clear; | |
303 | u8 mask; | |
304 | u8 val; | |
305 | int ret; | |
306 | ||
307 | /* Clear any previous measurement overflow status */ | |
308 | ret = regmap_read(ak8974->map, AK8974_INT_CLEAR, &clear); | |
309 | if (ret) | |
310 | return ret; | |
311 | ||
312 | /* If we have a DRDY IRQ line, use it */ | |
313 | if (ak8974->drdy_irq) { | |
314 | mask = AK8974_CTRL2_INT_EN | | |
315 | AK8974_CTRL2_DRDY_EN | | |
316 | AK8974_CTRL2_DRDY_POL; | |
317 | val = AK8974_CTRL2_DRDY_EN; | |
318 | ||
319 | if (!ak8974->drdy_active_low) | |
320 | val |= AK8974_CTRL2_DRDY_POL; | |
321 | ||
322 | init_completion(&ak8974->drdy_complete); | |
323 | ret = regmap_update_bits(ak8974->map, AK8974_CTRL2, | |
324 | mask, val); | |
325 | if (ret) | |
326 | return ret; | |
327 | } | |
328 | ||
329 | /* Force a measurement */ | |
330 | return regmap_update_bits(ak8974->map, | |
331 | AK8974_CTRL3, | |
332 | AK8974_CTRL3_FORCE, | |
333 | AK8974_CTRL3_FORCE); | |
334 | } | |
335 | ||
336 | static int ak8974_await_drdy(struct ak8974 *ak8974) | |
337 | { | |
338 | int timeout = 2; | |
339 | unsigned int val; | |
340 | int ret; | |
341 | ||
342 | if (ak8974->drdy_irq) { | |
343 | ret = wait_for_completion_timeout(&ak8974->drdy_complete, | |
344 | 1 + msecs_to_jiffies(1000)); | |
345 | if (!ret) { | |
346 | dev_err(&ak8974->i2c->dev, | |
347 | "timeout waiting for DRDY IRQ\n"); | |
348 | return -ETIMEDOUT; | |
349 | } | |
350 | return 0; | |
351 | } | |
352 | ||
353 | /* Default delay-based poll loop */ | |
354 | do { | |
355 | msleep(AK8974_MEASTIME); | |
356 | ret = regmap_read(ak8974->map, AK8974_STATUS, &val); | |
357 | if (ret < 0) | |
358 | return ret; | |
359 | if (val & AK8974_STATUS_DRDY) | |
360 | return 0; | |
361 | } while (--timeout); | |
7c94a8b2 | 362 | |
e2eb179c CIK |
363 | dev_err(&ak8974->i2c->dev, "timeout waiting for DRDY\n"); |
364 | return -ETIMEDOUT; | |
7c94a8b2 LW |
365 | } |
366 | ||
7f709dcd | 367 | static int ak8974_getresult(struct ak8974 *ak8974, __le16 *result) |
7c94a8b2 LW |
368 | { |
369 | unsigned int src; | |
370 | int ret; | |
371 | ||
372 | ret = ak8974_await_drdy(ak8974); | |
373 | if (ret) | |
374 | return ret; | |
375 | ret = regmap_read(ak8974->map, AK8974_INT_SRC, &src); | |
376 | if (ret < 0) | |
377 | return ret; | |
378 | ||
379 | /* Out of range overflow! Strong magnet close? */ | |
380 | if (src & AK8974_INT_RANGE) { | |
381 | dev_err(&ak8974->i2c->dev, | |
382 | "range overflow in sensor\n"); | |
383 | return -ERANGE; | |
384 | } | |
385 | ||
386 | ret = regmap_bulk_read(ak8974->map, AK8974_DATA_X, result, 6); | |
387 | if (ret) | |
388 | return ret; | |
389 | ||
390 | return ret; | |
391 | } | |
392 | ||
393 | static irqreturn_t ak8974_drdy_irq(int irq, void *d) | |
394 | { | |
395 | struct ak8974 *ak8974 = d; | |
396 | ||
397 | if (!ak8974->drdy_irq) | |
398 | return IRQ_NONE; | |
399 | ||
400 | /* TODO: timestamp here to get good measurement stamps */ | |
401 | return IRQ_WAKE_THREAD; | |
402 | } | |
403 | ||
404 | static irqreturn_t ak8974_drdy_irq_thread(int irq, void *d) | |
405 | { | |
406 | struct ak8974 *ak8974 = d; | |
407 | unsigned int val; | |
408 | int ret; | |
409 | ||
410 | /* Check if this was a DRDY from us */ | |
411 | ret = regmap_read(ak8974->map, AK8974_STATUS, &val); | |
412 | if (ret < 0) { | |
413 | dev_err(&ak8974->i2c->dev, "error reading DRDY status\n"); | |
414 | return IRQ_HANDLED; | |
415 | } | |
416 | if (val & AK8974_STATUS_DRDY) { | |
417 | /* Yes this was our IRQ */ | |
418 | complete(&ak8974->drdy_complete); | |
419 | return IRQ_HANDLED; | |
420 | } | |
421 | ||
422 | /* We may be on a shared IRQ, let the next client check */ | |
423 | return IRQ_NONE; | |
424 | } | |
425 | ||
426 | static int ak8974_selftest(struct ak8974 *ak8974) | |
427 | { | |
428 | struct device *dev = &ak8974->i2c->dev; | |
429 | unsigned int val; | |
430 | int ret; | |
431 | ||
432 | ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val); | |
433 | if (ret) | |
434 | return ret; | |
435 | if (val != AK8974_SELFTEST_IDLE) { | |
436 | dev_err(dev, "selftest not idle before test\n"); | |
437 | return -EIO; | |
438 | } | |
439 | ||
440 | /* Trigger self-test */ | |
441 | ret = regmap_update_bits(ak8974->map, | |
442 | AK8974_CTRL3, | |
443 | AK8974_CTRL3_SELFTEST, | |
444 | AK8974_CTRL3_SELFTEST); | |
445 | if (ret) { | |
446 | dev_err(dev, "could not write CTRL3\n"); | |
447 | return ret; | |
448 | } | |
449 | ||
450 | msleep(AK8974_SELFTEST_DELAY); | |
451 | ||
452 | ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val); | |
453 | if (ret) | |
454 | return ret; | |
455 | if (val != AK8974_SELFTEST_OK) { | |
456 | dev_err(dev, "selftest result NOT OK (%02x)\n", val); | |
457 | return -EIO; | |
458 | } | |
459 | ||
460 | ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val); | |
461 | if (ret) | |
462 | return ret; | |
463 | if (val != AK8974_SELFTEST_IDLE) { | |
464 | dev_err(dev, "selftest not idle after test (%02x)\n", val); | |
465 | return -EIO; | |
466 | } | |
467 | dev_dbg(dev, "passed self-test\n"); | |
468 | ||
469 | return 0; | |
470 | } | |
471 | ||
0a60340f MM |
472 | static void ak8974_read_calib_data(struct ak8974 *ak8974, unsigned int reg, |
473 | __le16 *tab, size_t tab_size) | |
474 | { | |
475 | int ret = regmap_bulk_read(ak8974->map, reg, tab, tab_size); | |
476 | if (ret) { | |
477 | memset(tab, 0xFF, tab_size); | |
478 | dev_warn(&ak8974->i2c->dev, | |
479 | "can't read calibration data (regs %u..%zu): %d\n", | |
480 | reg, reg + tab_size - 1, ret); | |
481 | } else { | |
482 | add_device_randomness(tab, tab_size); | |
483 | } | |
484 | } | |
485 | ||
7c94a8b2 LW |
486 | static int ak8974_detect(struct ak8974 *ak8974) |
487 | { | |
488 | unsigned int whoami; | |
489 | const char *name; | |
490 | int ret; | |
491 | unsigned int fw; | |
492 | u16 sn; | |
493 | ||
494 | ret = regmap_read(ak8974->map, AK8974_WHOAMI, &whoami); | |
495 | if (ret) | |
496 | return ret; | |
497 | ||
21be26fc MM |
498 | name = "ami305"; |
499 | ||
7c94a8b2 | 500 | switch (whoami) { |
21be26fc MM |
501 | case AK8974_WHOAMI_VALUE_AMI306: |
502 | name = "ami306"; | |
df561f66 | 503 | fallthrough; |
7c94a8b2 | 504 | case AK8974_WHOAMI_VALUE_AMI305: |
7c94a8b2 LW |
505 | ret = regmap_read(ak8974->map, AMI305_VER, &fw); |
506 | if (ret) | |
507 | return ret; | |
508 | fw &= 0x7f; /* only bits 0 thru 6 valid */ | |
509 | ret = ak8974_get_u16_val(ak8974, AMI305_SN, &sn); | |
510 | if (ret) | |
511 | return ret; | |
408cc6eb | 512 | add_device_randomness(&sn, sizeof(sn)); |
7c94a8b2 LW |
513 | dev_info(&ak8974->i2c->dev, |
514 | "detected %s, FW ver %02x, S/N: %04x\n", | |
515 | name, fw, sn); | |
516 | break; | |
517 | case AK8974_WHOAMI_VALUE_AK8974: | |
518 | name = "ak8974"; | |
519 | dev_info(&ak8974->i2c->dev, "detected AK8974\n"); | |
520 | break; | |
525530af NR |
521 | case AK8974_WHOAMI_VALUE_HSCDTD008A: |
522 | name = "hscdtd008a"; | |
523 | dev_info(&ak8974->i2c->dev, "detected hscdtd008a\n"); | |
524 | break; | |
7c94a8b2 LW |
525 | default: |
526 | dev_err(&ak8974->i2c->dev, "unsupported device (%02x) ", | |
527 | whoami); | |
528 | return -ENODEV; | |
529 | } | |
530 | ||
531 | ak8974->name = name; | |
532 | ak8974->variant = whoami; | |
533 | ||
0a60340f MM |
534 | if (whoami == AK8974_WHOAMI_VALUE_AMI306) { |
535 | __le16 fab_data1[9], fab_data2[3]; | |
536 | int i; | |
537 | ||
538 | ak8974_read_calib_data(ak8974, AMI306_FINEOUTPUT_X, | |
539 | fab_data1, sizeof(fab_data1)); | |
540 | ak8974_read_calib_data(ak8974, AMI306_OFFZERO_X, | |
541 | fab_data2, sizeof(fab_data2)); | |
542 | ||
543 | for (i = 0; i < 3; ++i) { | |
544 | static const char axis[3] = "XYZ"; | |
545 | static const char pgaxis[6] = "ZYZXYX"; | |
546 | unsigned offz = le16_to_cpu(fab_data2[i]) & 0x7F; | |
547 | unsigned fine = le16_to_cpu(fab_data1[i]); | |
548 | unsigned sens = le16_to_cpu(fab_data1[i + 3]); | |
549 | unsigned pgain1 = le16_to_cpu(fab_data1[i + 6]); | |
550 | unsigned pgain2 = pgain1 >> 8; | |
551 | ||
552 | pgain1 &= 0xFF; | |
553 | ||
554 | dev_info(&ak8974->i2c->dev, | |
555 | "factory calibration for axis %c: offz=%u sens=%u fine=%u pga%c=%u pga%c=%u\n", | |
556 | axis[i], offz, sens, fine, pgaxis[i * 2], | |
557 | pgain1, pgaxis[i * 2 + 1], pgain2); | |
558 | } | |
559 | } | |
560 | ||
7c94a8b2 LW |
561 | return 0; |
562 | } | |
563 | ||
55ecaf17 LW |
564 | static int ak8974_measure_channel(struct ak8974 *ak8974, unsigned long address, |
565 | int *val) | |
566 | { | |
567 | __le16 hw_values[3]; | |
568 | int ret; | |
569 | ||
570 | pm_runtime_get_sync(&ak8974->i2c->dev); | |
571 | mutex_lock(&ak8974->lock); | |
572 | ||
573 | /* | |
574 | * We read all axes and discard all but one, for optimized | |
575 | * reading, use the triggered buffer. | |
576 | */ | |
577 | ret = ak8974_trigmeas(ak8974); | |
578 | if (ret) | |
579 | goto out_unlock; | |
580 | ret = ak8974_getresult(ak8974, hw_values); | |
581 | if (ret) | |
582 | goto out_unlock; | |
583 | /* | |
584 | * This explicit cast to (s16) is necessary as the measurement | |
585 | * is done in 2's complement with positive and negative values. | |
586 | * The follwing assignment to *val will then convert the signed | |
587 | * s16 value to a signed int value. | |
588 | */ | |
589 | *val = (s16)le16_to_cpu(hw_values[address]); | |
590 | out_unlock: | |
591 | mutex_unlock(&ak8974->lock); | |
592 | pm_runtime_mark_last_busy(&ak8974->i2c->dev); | |
593 | pm_runtime_put_autosuspend(&ak8974->i2c->dev); | |
594 | ||
595 | return ret; | |
596 | } | |
597 | ||
7c94a8b2 LW |
598 | static int ak8974_read_raw(struct iio_dev *indio_dev, |
599 | struct iio_chan_spec const *chan, | |
600 | int *val, int *val2, | |
601 | long mask) | |
602 | { | |
603 | struct ak8974 *ak8974 = iio_priv(indio_dev); | |
55ecaf17 | 604 | int ret; |
7c94a8b2 LW |
605 | |
606 | switch (mask) { | |
607 | case IIO_CHAN_INFO_RAW: | |
608 | if (chan->address > 2) { | |
609 | dev_err(&ak8974->i2c->dev, "faulty channel address\n"); | |
55ecaf17 | 610 | return -EIO; |
7c94a8b2 | 611 | } |
55ecaf17 | 612 | ret = ak8974_measure_channel(ak8974, chan->address, val); |
7c94a8b2 | 613 | if (ret) |
55ecaf17 LW |
614 | return ret; |
615 | return IIO_VAL_INT; | |
16636527 LW |
616 | case IIO_CHAN_INFO_SCALE: |
617 | switch (ak8974->variant) { | |
618 | case AK8974_WHOAMI_VALUE_AMI306: | |
619 | case AK8974_WHOAMI_VALUE_AMI305: | |
620 | /* | |
621 | * The datasheet for AMI305 and AMI306, page 6 | |
622 | * specifies the range of the sensor to be | |
623 | * +/- 12 Gauss. | |
624 | */ | |
625 | *val = 12; | |
626 | /* | |
627 | * 12 bits are used, +/- 2^11 | |
628 | * [ -2048 .. 2047 ] (manual page 20) | |
629 | * [ 0xf800 .. 0x07ff ] | |
630 | */ | |
631 | *val2 = 11; | |
632 | return IIO_VAL_FRACTIONAL_LOG2; | |
633 | case AK8974_WHOAMI_VALUE_HSCDTD008A: | |
634 | /* | |
635 | * The datasheet for HSCDTF008A, page 3 specifies the | |
636 | * range of the sensor as +/- 2.4 mT per axis, which | |
637 | * corresponds to +/- 2400 uT = +/- 24 Gauss. | |
638 | */ | |
639 | *val = 24; | |
640 | /* | |
641 | * 15 bits are used (set up in CTRL4), +/- 2^14 | |
642 | * [ -16384 .. 16383 ] (manual page 24) | |
643 | * [ 0xc000 .. 0x3fff ] | |
644 | */ | |
645 | *val2 = 14; | |
646 | return IIO_VAL_FRACTIONAL_LOG2; | |
647 | default: | |
648 | /* GUESSING +/- 12 Gauss */ | |
649 | *val = 12; | |
650 | /* GUESSING 12 bits ADC +/- 2^11 */ | |
651 | *val2 = 11; | |
652 | return IIO_VAL_FRACTIONAL_LOG2; | |
653 | } | |
654 | break; | |
655 | default: | |
656 | /* Unknown request */ | |
657 | break; | |
7c94a8b2 LW |
658 | } |
659 | ||
55ecaf17 | 660 | return -EINVAL; |
7c94a8b2 LW |
661 | } |
662 | ||
663 | static void ak8974_fill_buffer(struct iio_dev *indio_dev) | |
664 | { | |
665 | struct ak8974 *ak8974 = iio_priv(indio_dev); | |
666 | int ret; | |
7c94a8b2 LW |
667 | |
668 | pm_runtime_get_sync(&ak8974->i2c->dev); | |
669 | mutex_lock(&ak8974->lock); | |
670 | ||
671 | ret = ak8974_trigmeas(ak8974); | |
672 | if (ret) { | |
673 | dev_err(&ak8974->i2c->dev, "error triggering measure\n"); | |
674 | goto out_unlock; | |
675 | } | |
838e00b1 | 676 | ret = ak8974_getresult(ak8974, ak8974->scan.channels); |
7c94a8b2 LW |
677 | if (ret) { |
678 | dev_err(&ak8974->i2c->dev, "error getting measures\n"); | |
679 | goto out_unlock; | |
680 | } | |
681 | ||
838e00b1 | 682 | iio_push_to_buffers_with_timestamp(indio_dev, &ak8974->scan, |
7c94a8b2 LW |
683 | iio_get_time_ns(indio_dev)); |
684 | ||
685 | out_unlock: | |
686 | mutex_unlock(&ak8974->lock); | |
687 | pm_runtime_mark_last_busy(&ak8974->i2c->dev); | |
688 | pm_runtime_put_autosuspend(&ak8974->i2c->dev); | |
689 | } | |
690 | ||
691 | static irqreturn_t ak8974_handle_trigger(int irq, void *p) | |
692 | { | |
693 | const struct iio_poll_func *pf = p; | |
694 | struct iio_dev *indio_dev = pf->indio_dev; | |
695 | ||
696 | ak8974_fill_buffer(indio_dev); | |
697 | iio_trigger_notify_done(indio_dev->trig); | |
698 | ||
699 | return IRQ_HANDLED; | |
700 | } | |
701 | ||
702 | static const struct iio_mount_matrix * | |
703 | ak8974_get_mount_matrix(const struct iio_dev *indio_dev, | |
704 | const struct iio_chan_spec *chan) | |
705 | { | |
706 | struct ak8974 *ak8974 = iio_priv(indio_dev); | |
707 | ||
708 | return &ak8974->orientation; | |
709 | } | |
710 | ||
711 | static const struct iio_chan_spec_ext_info ak8974_ext_info[] = { | |
712 | IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, ak8974_get_mount_matrix), | |
713 | { }, | |
714 | }; | |
715 | ||
b67959eb | 716 | #define AK8974_AXIS_CHANNEL(axis, index, bits) \ |
7c94a8b2 LW |
717 | { \ |
718 | .type = IIO_MAGN, \ | |
719 | .modified = 1, \ | |
720 | .channel2 = IIO_MOD_##axis, \ | |
16636527 LW |
721 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
722 | BIT(IIO_CHAN_INFO_SCALE), \ | |
7c94a8b2 LW |
723 | .ext_info = ak8974_ext_info, \ |
724 | .address = index, \ | |
725 | .scan_index = index, \ | |
726 | .scan_type = { \ | |
727 | .sign = 's', \ | |
b67959eb | 728 | .realbits = bits, \ |
7c94a8b2 LW |
729 | .storagebits = 16, \ |
730 | .endianness = IIO_LE \ | |
731 | }, \ | |
732 | } | |
733 | ||
b67959eb LW |
734 | /* |
735 | * We have no datasheet for the AK8974 but we guess that its | |
736 | * ADC is 12 bits. The AMI305 and AMI306 certainly has 12bit | |
737 | * ADC. | |
738 | */ | |
739 | static const struct iio_chan_spec ak8974_12_bits_channels[] = { | |
740 | AK8974_AXIS_CHANNEL(X, 0, 12), | |
741 | AK8974_AXIS_CHANNEL(Y, 1, 12), | |
742 | AK8974_AXIS_CHANNEL(Z, 2, 12), | |
743 | IIO_CHAN_SOFT_TIMESTAMP(3), | |
744 | }; | |
745 | ||
746 | /* | |
747 | * The HSCDTD008A has 15 bits resolution the way we set it up | |
748 | * in CTRL4. | |
749 | */ | |
750 | static const struct iio_chan_spec ak8974_15_bits_channels[] = { | |
751 | AK8974_AXIS_CHANNEL(X, 0, 15), | |
752 | AK8974_AXIS_CHANNEL(Y, 1, 15), | |
753 | AK8974_AXIS_CHANNEL(Z, 2, 15), | |
7c94a8b2 LW |
754 | IIO_CHAN_SOFT_TIMESTAMP(3), |
755 | }; | |
756 | ||
757 | static const unsigned long ak8974_scan_masks[] = { 0x7, 0 }; | |
758 | ||
759 | static const struct iio_info ak8974_info = { | |
760 | .read_raw = &ak8974_read_raw, | |
7c94a8b2 LW |
761 | }; |
762 | ||
763 | static bool ak8974_writeable_reg(struct device *dev, unsigned int reg) | |
764 | { | |
765 | struct i2c_client *i2c = to_i2c_client(dev); | |
766 | struct iio_dev *indio_dev = i2c_get_clientdata(i2c); | |
767 | struct ak8974 *ak8974 = iio_priv(indio_dev); | |
768 | ||
769 | switch (reg) { | |
770 | case AK8974_CTRL1: | |
771 | case AK8974_CTRL2: | |
772 | case AK8974_CTRL3: | |
773 | case AK8974_INT_CTRL: | |
774 | case AK8974_INT_THRES: | |
775 | case AK8974_INT_THRES + 1: | |
525530af | 776 | return true; |
7c94a8b2 LW |
777 | case AK8974_PRESET: |
778 | case AK8974_PRESET + 1: | |
525530af | 779 | return ak8974->variant != AK8974_WHOAMI_VALUE_HSCDTD008A; |
7c94a8b2 LW |
780 | case AK8974_OFFSET_X: |
781 | case AK8974_OFFSET_X + 1: | |
782 | case AK8974_OFFSET_Y: | |
783 | case AK8974_OFFSET_Y + 1: | |
784 | case AK8974_OFFSET_Z: | |
785 | case AK8974_OFFSET_Z + 1: | |
525530af NR |
786 | return ak8974->variant == AK8974_WHOAMI_VALUE_AK8974 || |
787 | ak8974->variant == AK8974_WHOAMI_VALUE_HSCDTD008A; | |
7c94a8b2 LW |
788 | case AMI305_OFFSET_X: |
789 | case AMI305_OFFSET_X + 1: | |
790 | case AMI305_OFFSET_Y: | |
791 | case AMI305_OFFSET_Y + 1: | |
792 | case AMI305_OFFSET_Z: | |
793 | case AMI305_OFFSET_Z + 1: | |
21be26fc MM |
794 | return ak8974->variant == AK8974_WHOAMI_VALUE_AMI305 || |
795 | ak8974->variant == AK8974_WHOAMI_VALUE_AMI306; | |
796 | case AMI306_CTRL4: | |
797 | case AMI306_CTRL4 + 1: | |
798 | return ak8974->variant == AK8974_WHOAMI_VALUE_AMI306; | |
7c94a8b2 LW |
799 | default: |
800 | return false; | |
801 | } | |
802 | } | |
803 | ||
9991f99e MM |
804 | static bool ak8974_precious_reg(struct device *dev, unsigned int reg) |
805 | { | |
806 | return reg == AK8974_INT_CLEAR; | |
807 | } | |
808 | ||
7c94a8b2 LW |
809 | static const struct regmap_config ak8974_regmap_config = { |
810 | .reg_bits = 8, | |
811 | .val_bits = 8, | |
812 | .max_register = 0xff, | |
813 | .writeable_reg = ak8974_writeable_reg, | |
9991f99e | 814 | .precious_reg = ak8974_precious_reg, |
7c94a8b2 LW |
815 | }; |
816 | ||
149a5043 | 817 | static int ak8974_probe(struct i2c_client *i2c) |
7c94a8b2 LW |
818 | { |
819 | struct iio_dev *indio_dev; | |
820 | struct ak8974 *ak8974; | |
821 | unsigned long irq_trig; | |
822 | int irq = i2c->irq; | |
823 | int ret; | |
824 | ||
825 | /* Register with IIO */ | |
826 | indio_dev = devm_iio_device_alloc(&i2c->dev, sizeof(*ak8974)); | |
827 | if (indio_dev == NULL) | |
828 | return -ENOMEM; | |
829 | ||
830 | ak8974 = iio_priv(indio_dev); | |
831 | i2c_set_clientdata(i2c, indio_dev); | |
832 | ak8974->i2c = i2c; | |
833 | mutex_init(&ak8974->lock); | |
834 | ||
b892770a | 835 | ret = iio_read_mount_matrix(&i2c->dev, &ak8974->orientation); |
7c94a8b2 LW |
836 | if (ret) |
837 | return ret; | |
838 | ||
839 | ak8974->regs[0].supply = ak8974_reg_avdd; | |
840 | ak8974->regs[1].supply = ak8974_reg_dvdd; | |
841 | ||
842 | ret = devm_regulator_bulk_get(&i2c->dev, | |
843 | ARRAY_SIZE(ak8974->regs), | |
844 | ak8974->regs); | |
5d2180ce KK |
845 | if (ret < 0) |
846 | return dev_err_probe(&i2c->dev, ret, "cannot get regulators\n"); | |
7c94a8b2 LW |
847 | |
848 | ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs); | |
849 | if (ret < 0) { | |
850 | dev_err(&i2c->dev, "cannot enable regulators\n"); | |
851 | return ret; | |
852 | } | |
853 | ||
854 | /* Take runtime PM online */ | |
855 | pm_runtime_get_noresume(&i2c->dev); | |
856 | pm_runtime_set_active(&i2c->dev); | |
857 | pm_runtime_enable(&i2c->dev); | |
858 | ||
859 | ak8974->map = devm_regmap_init_i2c(i2c, &ak8974_regmap_config); | |
860 | if (IS_ERR(ak8974->map)) { | |
861 | dev_err(&i2c->dev, "failed to allocate register map\n"); | |
0187294d DL |
862 | pm_runtime_put_noidle(&i2c->dev); |
863 | pm_runtime_disable(&i2c->dev); | |
7c94a8b2 LW |
864 | return PTR_ERR(ak8974->map); |
865 | } | |
866 | ||
867 | ret = ak8974_set_power(ak8974, AK8974_PWR_ON); | |
868 | if (ret) { | |
869 | dev_err(&i2c->dev, "could not power on\n"); | |
0187294d | 870 | goto disable_pm; |
7c94a8b2 LW |
871 | } |
872 | ||
873 | ret = ak8974_detect(ak8974); | |
874 | if (ret) { | |
21be26fc | 875 | dev_err(&i2c->dev, "neither AK8974 nor AMI30x found\n"); |
0187294d | 876 | goto disable_pm; |
7c94a8b2 LW |
877 | } |
878 | ||
879 | ret = ak8974_selftest(ak8974); | |
880 | if (ret) | |
881 | dev_err(&i2c->dev, "selftest failed (continuing anyway)\n"); | |
882 | ||
883 | ret = ak8974_reset(ak8974); | |
884 | if (ret) { | |
885 | dev_err(&i2c->dev, "AK8974 reset failed\n"); | |
0187294d | 886 | goto disable_pm; |
7c94a8b2 LW |
887 | } |
888 | ||
b67959eb LW |
889 | switch (ak8974->variant) { |
890 | case AK8974_WHOAMI_VALUE_AMI306: | |
891 | case AK8974_WHOAMI_VALUE_AMI305: | |
892 | indio_dev->channels = ak8974_12_bits_channels; | |
893 | indio_dev->num_channels = ARRAY_SIZE(ak8974_12_bits_channels); | |
894 | break; | |
895 | case AK8974_WHOAMI_VALUE_HSCDTD008A: | |
896 | indio_dev->channels = ak8974_15_bits_channels; | |
897 | indio_dev->num_channels = ARRAY_SIZE(ak8974_15_bits_channels); | |
898 | break; | |
899 | default: | |
900 | indio_dev->channels = ak8974_12_bits_channels; | |
901 | indio_dev->num_channels = ARRAY_SIZE(ak8974_12_bits_channels); | |
902 | break; | |
903 | } | |
7c94a8b2 LW |
904 | indio_dev->info = &ak8974_info; |
905 | indio_dev->available_scan_masks = ak8974_scan_masks; | |
906 | indio_dev->modes = INDIO_DIRECT_MODE; | |
907 | indio_dev->name = ak8974->name; | |
908 | ||
909 | ret = iio_triggered_buffer_setup(indio_dev, NULL, | |
910 | ak8974_handle_trigger, | |
911 | NULL); | |
912 | if (ret) { | |
913 | dev_err(&i2c->dev, "triggered buffer setup failed\n"); | |
914 | goto disable_pm; | |
915 | } | |
916 | ||
917 | /* If we have a valid DRDY IRQ, make use of it */ | |
918 | if (irq > 0) { | |
919 | irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq)); | |
920 | if (irq_trig == IRQF_TRIGGER_RISING) { | |
921 | dev_info(&i2c->dev, "enable rising edge DRDY IRQ\n"); | |
922 | } else if (irq_trig == IRQF_TRIGGER_FALLING) { | |
923 | ak8974->drdy_active_low = true; | |
924 | dev_info(&i2c->dev, "enable falling edge DRDY IRQ\n"); | |
925 | } else { | |
926 | irq_trig = IRQF_TRIGGER_RISING; | |
927 | } | |
928 | irq_trig |= IRQF_ONESHOT; | |
929 | irq_trig |= IRQF_SHARED; | |
930 | ||
931 | ret = devm_request_threaded_irq(&i2c->dev, | |
932 | irq, | |
933 | ak8974_drdy_irq, | |
934 | ak8974_drdy_irq_thread, | |
935 | irq_trig, | |
936 | ak8974->name, | |
937 | ak8974); | |
938 | if (ret) { | |
939 | dev_err(&i2c->dev, "unable to request DRDY IRQ " | |
940 | "- proceeding without IRQ\n"); | |
941 | goto no_irq; | |
942 | } | |
943 | ak8974->drdy_irq = true; | |
944 | } | |
945 | ||
946 | no_irq: | |
947 | ret = iio_device_register(indio_dev); | |
948 | if (ret) { | |
949 | dev_err(&i2c->dev, "device register failed\n"); | |
950 | goto cleanup_buffer; | |
951 | } | |
952 | ||
0187294d DL |
953 | pm_runtime_set_autosuspend_delay(&i2c->dev, |
954 | AK8974_AUTOSUSPEND_DELAY); | |
955 | pm_runtime_use_autosuspend(&i2c->dev); | |
956 | pm_runtime_put(&i2c->dev); | |
957 | ||
7c94a8b2 LW |
958 | return 0; |
959 | ||
960 | cleanup_buffer: | |
961 | iio_triggered_buffer_cleanup(indio_dev); | |
962 | disable_pm: | |
963 | pm_runtime_put_noidle(&i2c->dev); | |
964 | pm_runtime_disable(&i2c->dev); | |
965 | ak8974_set_power(ak8974, AK8974_PWR_OFF); | |
7c94a8b2 LW |
966 | regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); |
967 | ||
968 | return ret; | |
969 | } | |
970 | ||
ed5c2f5f | 971 | static void ak8974_remove(struct i2c_client *i2c) |
7c94a8b2 LW |
972 | { |
973 | struct iio_dev *indio_dev = i2c_get_clientdata(i2c); | |
974 | struct ak8974 *ak8974 = iio_priv(indio_dev); | |
975 | ||
976 | iio_device_unregister(indio_dev); | |
977 | iio_triggered_buffer_cleanup(indio_dev); | |
978 | pm_runtime_get_sync(&i2c->dev); | |
979 | pm_runtime_put_noidle(&i2c->dev); | |
980 | pm_runtime_disable(&i2c->dev); | |
981 | ak8974_set_power(ak8974, AK8974_PWR_OFF); | |
982 | regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); | |
7c94a8b2 LW |
983 | } |
984 | ||
74f4595a | 985 | static int ak8974_runtime_suspend(struct device *dev) |
7c94a8b2 LW |
986 | { |
987 | struct ak8974 *ak8974 = | |
988 | iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
989 | ||
990 | ak8974_set_power(ak8974, AK8974_PWR_OFF); | |
991 | regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); | |
992 | ||
993 | return 0; | |
994 | } | |
995 | ||
74f4595a | 996 | static int ak8974_runtime_resume(struct device *dev) |
7c94a8b2 LW |
997 | { |
998 | struct ak8974 *ak8974 = | |
999 | iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
1000 | int ret; | |
1001 | ||
1002 | ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs); | |
1003 | if (ret) | |
1004 | return ret; | |
1005 | msleep(AK8974_POWERON_DELAY); | |
1006 | ret = ak8974_set_power(ak8974, AK8974_PWR_ON); | |
1007 | if (ret) | |
1008 | goto out_regulator_disable; | |
1009 | ||
1010 | ret = ak8974_configure(ak8974); | |
1011 | if (ret) | |
1012 | goto out_disable_power; | |
1013 | ||
1014 | return 0; | |
1015 | ||
1016 | out_disable_power: | |
1017 | ak8974_set_power(ak8974, AK8974_PWR_OFF); | |
1018 | out_regulator_disable: | |
1019 | regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs); | |
1020 | ||
1021 | return ret; | |
1022 | } | |
7c94a8b2 | 1023 | |
74f4595a JC |
1024 | static DEFINE_RUNTIME_DEV_PM_OPS(ak8974_dev_pm_ops, ak8974_runtime_suspend, |
1025 | ak8974_runtime_resume, NULL); | |
7c94a8b2 LW |
1026 | |
1027 | static const struct i2c_device_id ak8974_id[] = { | |
1028 | {"ami305", 0 }, | |
21be26fc | 1029 | {"ami306", 0 }, |
7c94a8b2 | 1030 | {"ak8974", 0 }, |
525530af | 1031 | {"hscdtd008a", 0 }, |
7c94a8b2 LW |
1032 | {} |
1033 | }; | |
1034 | MODULE_DEVICE_TABLE(i2c, ak8974_id); | |
1035 | ||
1036 | static const struct of_device_id ak8974_of_match[] = { | |
1037 | { .compatible = "asahi-kasei,ak8974", }, | |
525530af | 1038 | { .compatible = "alps,hscdtd008a", }, |
7c94a8b2 LW |
1039 | {} |
1040 | }; | |
1041 | MODULE_DEVICE_TABLE(of, ak8974_of_match); | |
1042 | ||
1043 | static struct i2c_driver ak8974_driver = { | |
1044 | .driver = { | |
1045 | .name = "ak8974", | |
74f4595a | 1046 | .pm = pm_ptr(&ak8974_dev_pm_ops), |
2b4f0172 | 1047 | .of_match_table = ak8974_of_match, |
7c94a8b2 | 1048 | }, |
7cf15f42 | 1049 | .probe = ak8974_probe, |
3ff861f5 | 1050 | .remove = ak8974_remove, |
7c94a8b2 LW |
1051 | .id_table = ak8974_id, |
1052 | }; | |
1053 | module_i2c_driver(ak8974_driver); | |
1054 | ||
21be26fc | 1055 | MODULE_DESCRIPTION("AK8974 and AMI30x 3-axis magnetometer driver"); |
7c94a8b2 LW |
1056 | MODULE_AUTHOR("Samu Onkalo"); |
1057 | MODULE_AUTHOR("Linus Walleij"); | |
1058 | MODULE_LICENSE("GPL v2"); |