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574fb258 JC |
1 | /* |
2 | * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
8 | * Copyright (c) 2009 Jonathan Cameron <jic23@cam.ac.uk> | |
9 | * | |
10 | * See industrialio/accels/sca3000.h for comments. | |
11 | */ | |
12 | ||
13 | #include <linux/interrupt.h> | |
14 | #include <linux/gpio.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/device.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
574fb258 JC |
18 | #include <linux/kernel.h> |
19 | #include <linux/spi/spi.h> | |
20 | #include <linux/sysfs.h> | |
21 | #include "../iio.h" | |
22 | #include "../sysfs.h" | |
23 | #include "../ring_generic.h" | |
24 | ||
25 | #include "accel.h" | |
26 | #include "sca3000.h" | |
27 | ||
28 | enum sca3000_variant { | |
29 | d01, | |
30 | d03, | |
31 | e02, | |
32 | e04, | |
33 | e05, | |
34 | l01, | |
35 | }; | |
36 | ||
37 | /* Note where option modes are not defined, the chip simply does not | |
38 | * support any. | |
39 | * Other chips in the sca3000 series use i2c and are not included here. | |
40 | * | |
41 | * Some of these devices are only listed in the family data sheet and | |
42 | * do not actually appear to be available. | |
43 | */ | |
44 | static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = { | |
45 | { | |
46 | .name = "sca3000-d01", | |
47 | .temp_output = true, | |
48 | .measurement_mode_freq = 250, | |
49 | .option_mode_1 = SCA3000_OP_MODE_BYPASS, | |
50 | .option_mode_1_freq = 250, | |
51 | }, { | |
52 | /* No data sheet available - may be the same as the 3100-d03?*/ | |
53 | .name = "sca3000-d03", | |
54 | .temp_output = true, | |
55 | }, { | |
56 | .name = "sca3000-e02", | |
57 | .measurement_mode_freq = 125, | |
58 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
59 | .option_mode_1_freq = 63, | |
60 | }, { | |
61 | .name = "sca3000-e04", | |
62 | .measurement_mode_freq = 100, | |
63 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
64 | .option_mode_1_freq = 50, | |
65 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
66 | .option_mode_2_freq = 400, | |
67 | }, { | |
68 | .name = "sca3000-e05", | |
69 | .measurement_mode_freq = 200, | |
70 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
71 | .option_mode_1_freq = 50, | |
72 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
73 | .option_mode_2_freq = 400, | |
74 | }, { | |
75 | /* No data sheet available. | |
76 | * Frequencies are unknown. | |
77 | */ | |
78 | .name = "sca3000-l01", | |
79 | .temp_output = true, | |
80 | .option_mode_1 = SCA3000_OP_MODE_BYPASS, | |
81 | }, | |
82 | }; | |
83 | ||
84 | ||
85 | int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val) | |
86 | { | |
87 | struct spi_transfer xfer = { | |
88 | .bits_per_word = 8, | |
89 | .len = 2, | |
90 | .cs_change = 1, | |
91 | .tx_buf = st->tx, | |
92 | }; | |
93 | struct spi_message msg; | |
94 | ||
95 | st->tx[0] = SCA3000_WRITE_REG(address); | |
96 | st->tx[1] = val; | |
97 | spi_message_init(&msg); | |
98 | spi_message_add_tail(&xfer, &msg); | |
99 | ||
100 | return spi_sync(st->us, &msg); | |
101 | } | |
102 | ||
103 | int sca3000_read_data(struct sca3000_state *st, | |
104 | uint8_t reg_address_high, | |
105 | u8 **rx_p, | |
106 | int len) | |
107 | { | |
108 | int ret; | |
109 | struct spi_message msg; | |
110 | struct spi_transfer xfer = { | |
111 | .bits_per_word = 8, | |
112 | .len = len + 1, | |
113 | .cs_change = 1, | |
114 | .tx_buf = st->tx, | |
115 | }; | |
116 | ||
117 | *rx_p = kmalloc(len + 1, GFP_KERNEL); | |
118 | if (*rx_p == NULL) { | |
119 | ret = -ENOMEM; | |
120 | goto error_ret; | |
121 | } | |
122 | xfer.rx_buf = *rx_p; | |
123 | st->tx[0] = SCA3000_READ_REG(reg_address_high); | |
124 | spi_message_init(&msg); | |
125 | spi_message_add_tail(&xfer, &msg); | |
126 | ||
127 | ret = spi_sync(st->us, &msg); | |
128 | ||
129 | if (ret) { | |
130 | dev_err(get_device(&st->us->dev), "problem reading register"); | |
131 | goto error_free_rx; | |
132 | } | |
133 | ||
134 | return 0; | |
135 | error_free_rx: | |
136 | kfree(*rx_p); | |
137 | error_ret: | |
138 | return ret; | |
139 | ||
140 | } | |
141 | /** | |
142 | * sca3000_reg_lock_on() test if the ctrl register lock is on | |
143 | * | |
144 | * Lock must be held. | |
145 | **/ | |
146 | static int sca3000_reg_lock_on(struct sca3000_state *st) | |
147 | { | |
148 | u8 *rx; | |
149 | int ret; | |
150 | ||
151 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_STATUS, &rx, 1); | |
152 | ||
153 | if (ret < 0) | |
154 | return ret; | |
155 | ret = !(rx[1] & SCA3000_LOCKED); | |
156 | kfree(rx); | |
157 | ||
158 | return ret; | |
159 | } | |
160 | ||
161 | /** | |
162 | * __sca3000_unlock_reg_lock() unlock the control registers | |
163 | * | |
164 | * Note the device does not appear to support doing this in a single transfer. | |
165 | * This should only ever be used as part of ctrl reg read. | |
166 | * Lock must be held before calling this | |
167 | **/ | |
168 | static int __sca3000_unlock_reg_lock(struct sca3000_state *st) | |
169 | { | |
170 | struct spi_message msg; | |
171 | struct spi_transfer xfer[3] = { | |
172 | { | |
173 | .bits_per_word = 8, | |
174 | .len = 2, | |
175 | .cs_change = 1, | |
176 | .tx_buf = st->tx, | |
177 | }, { | |
178 | .bits_per_word = 8, | |
179 | .len = 2, | |
180 | .cs_change = 1, | |
181 | .tx_buf = st->tx + 2, | |
182 | }, { | |
183 | .bits_per_word = 8, | |
184 | .len = 2, | |
185 | .cs_change = 1, | |
186 | .tx_buf = st->tx + 4, | |
187 | }, | |
188 | }; | |
189 | st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
190 | st->tx[1] = 0x00; | |
191 | st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
192 | st->tx[3] = 0x50; | |
193 | st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
194 | st->tx[5] = 0xA0; | |
195 | spi_message_init(&msg); | |
196 | spi_message_add_tail(&xfer[0], &msg); | |
197 | spi_message_add_tail(&xfer[1], &msg); | |
198 | spi_message_add_tail(&xfer[2], &msg); | |
199 | ||
200 | return spi_sync(st->us, &msg); | |
201 | } | |
202 | ||
203 | /** | |
204 | * sca3000_write_ctrl_reg() write to a lock protect ctrl register | |
205 | * @sel: selects which registers we wish to write to | |
206 | * @val: the value to be written | |
207 | * | |
208 | * Certain control registers are protected against overwriting by the lock | |
209 | * register and use a shared write address. This function allows writing of | |
210 | * these registers. | |
211 | * Lock must be held. | |
212 | **/ | |
213 | static int sca3000_write_ctrl_reg(struct sca3000_state *st, | |
214 | uint8_t sel, | |
215 | uint8_t val) | |
216 | { | |
217 | ||
218 | int ret; | |
219 | ||
220 | ret = sca3000_reg_lock_on(st); | |
221 | if (ret < 0) | |
222 | goto error_ret; | |
223 | if (ret) { | |
224 | ret = __sca3000_unlock_reg_lock(st); | |
225 | if (ret) | |
226 | goto error_ret; | |
227 | } | |
228 | ||
229 | /* Set the control select register */ | |
230 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel); | |
231 | if (ret) | |
232 | goto error_ret; | |
233 | ||
234 | /* Write the actual value into the register */ | |
235 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val); | |
236 | ||
237 | error_ret: | |
238 | return ret; | |
239 | } | |
240 | ||
241 | /* Crucial that lock is called before calling this */ | |
242 | /** | |
243 | * sca3000_read_ctrl_reg() read from lock protected control register. | |
244 | * | |
245 | * Lock must be held. | |
246 | **/ | |
247 | static int sca3000_read_ctrl_reg(struct sca3000_state *st, | |
248 | u8 ctrl_reg, | |
249 | u8 **rx_p) | |
250 | { | |
251 | int ret; | |
252 | ||
253 | ret = sca3000_reg_lock_on(st); | |
254 | if (ret < 0) | |
255 | goto error_ret; | |
256 | if (ret) { | |
257 | ret = __sca3000_unlock_reg_lock(st); | |
258 | if (ret) | |
259 | goto error_ret; | |
260 | } | |
261 | /* Set the control select register */ | |
262 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg); | |
263 | if (ret) | |
264 | goto error_ret; | |
265 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_CTRL_DATA, rx_p, 1); | |
266 | ||
267 | error_ret: | |
268 | return ret; | |
269 | } | |
270 | ||
271 | #ifdef SCA3000_DEBUG | |
272 | /** | |
273 | * sca3000_check_status() check the status register | |
274 | * | |
275 | * Only used for debugging purposes | |
276 | **/ | |
277 | static int sca3000_check_status(struct device *dev) | |
278 | { | |
279 | u8 *rx; | |
280 | int ret; | |
281 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
282 | struct sca3000_state *st = indio_dev->dev_data; | |
283 | ||
284 | mutex_lock(&st->lock); | |
285 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_STATUS, &rx, 1); | |
286 | if (ret < 0) | |
287 | goto error_ret; | |
288 | if (rx[1] & SCA3000_EEPROM_CS_ERROR) | |
289 | dev_err(dev, "eeprom error \n"); | |
290 | if (rx[1] & SCA3000_SPI_FRAME_ERROR) | |
291 | dev_err(dev, "Previous SPI Frame was corrupt\n"); | |
292 | kfree(rx); | |
293 | ||
294 | error_ret: | |
295 | mutex_unlock(&st->lock); | |
296 | return ret; | |
297 | } | |
298 | #endif /* SCA3000_DEBUG */ | |
299 | ||
300 | /** | |
301 | * sca3000_read_13bit_signed() sysfs interface to read 13 bit signed registers | |
302 | * | |
303 | * These are described as signed 12 bit on the data sheet, which appears | |
304 | * to be a conventional 2's complement 13 bit. | |
305 | **/ | |
306 | static ssize_t sca3000_read_13bit_signed(struct device *dev, | |
307 | struct device_attribute *attr, | |
308 | char *buf) | |
309 | { | |
310 | int len = 0, ret; | |
311 | int val; | |
312 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
313 | u8 *rx; | |
314 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
315 | struct sca3000_state *st = indio_dev->dev_data; | |
316 | ||
317 | mutex_lock(&st->lock); | |
318 | ret = sca3000_read_data(st, this_attr->address, &rx, 2); | |
319 | if (ret < 0) | |
320 | goto error_ret; | |
321 | val = sca3000_13bit_convert(rx[1], rx[2]); | |
322 | len += sprintf(buf + len, "%d\n", val); | |
323 | kfree(rx); | |
324 | error_ret: | |
325 | mutex_unlock(&st->lock); | |
326 | ||
327 | return ret ? ret : len; | |
328 | } | |
329 | ||
330 | ||
331 | static ssize_t sca3000_show_name(struct device *dev, | |
332 | struct device_attribute *attr, | |
333 | char *buf) | |
334 | { | |
335 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
336 | struct sca3000_state *st = dev_info->dev_data; | |
337 | return sprintf(buf, "%s\n", st->info->name); | |
338 | } | |
339 | /** | |
340 | * sca3000_show_reg() - sysfs interface to read the chip revision number | |
341 | **/ | |
342 | static ssize_t sca3000_show_rev(struct device *dev, | |
343 | struct device_attribute *attr, | |
344 | char *buf) | |
345 | { | |
346 | int len = 0, ret; | |
347 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
348 | struct sca3000_state *st = dev_info->dev_data; | |
349 | ||
350 | u8 *rx; | |
351 | ||
352 | mutex_lock(&st->lock); | |
353 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_REVID, &rx, 1); | |
354 | if (ret < 0) | |
355 | goto error_ret; | |
356 | len += sprintf(buf + len, | |
357 | "major=%d, minor=%d\n", | |
358 | rx[1] & SCA3000_REVID_MAJOR_MASK, | |
359 | rx[1] & SCA3000_REVID_MINOR_MASK); | |
360 | kfree(rx); | |
361 | ||
362 | error_ret: | |
363 | mutex_unlock(&st->lock); | |
364 | ||
365 | return ret ? ret : len; | |
366 | } | |
367 | ||
368 | /** | |
369 | * sca3000_show_available_measurement_modes() display available modes | |
370 | * | |
371 | * This is all read from chip specific data in the driver. Not all | |
372 | * of the sca3000 series support modes other than normal. | |
373 | **/ | |
374 | static ssize_t | |
375 | sca3000_show_available_measurement_modes(struct device *dev, | |
376 | struct device_attribute *attr, | |
377 | char *buf) | |
378 | { | |
379 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
380 | struct sca3000_state *st = dev_info->dev_data; | |
381 | int len = 0; | |
382 | ||
383 | len += sprintf(buf + len, "0 - normal mode"); | |
384 | switch (st->info->option_mode_1) { | |
385 | case SCA3000_OP_MODE_NARROW: | |
386 | len += sprintf(buf + len, ", 1 - narrow mode"); | |
387 | break; | |
388 | case SCA3000_OP_MODE_BYPASS: | |
389 | len += sprintf(buf + len, ", 1 - bypass mode"); | |
390 | break; | |
391 | }; | |
392 | switch (st->info->option_mode_2) { | |
393 | case SCA3000_OP_MODE_WIDE: | |
394 | len += sprintf(buf + len, ", 2 - wide mode"); | |
395 | break; | |
396 | } | |
397 | /* always supported */ | |
398 | len += sprintf(buf + len, " 3 - motion detection \n"); | |
399 | ||
400 | return len; | |
401 | } | |
402 | ||
403 | /** | |
404 | * sca3000_show_measurmenet_mode() sysfs read of current mode | |
405 | **/ | |
406 | static ssize_t | |
407 | sca3000_show_measurement_mode(struct device *dev, | |
408 | struct device_attribute *attr, | |
409 | char *buf) | |
410 | { | |
411 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
412 | struct sca3000_state *st = dev_info->dev_data; | |
413 | int len = 0, ret; | |
414 | u8 *rx; | |
415 | ||
416 | mutex_lock(&st->lock); | |
417 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
418 | if (ret) | |
419 | goto error_ret; | |
420 | /* mask bottom 2 bits - only ones that are relevant */ | |
421 | rx[1] &= 0x03; | |
422 | switch (rx[1]) { | |
423 | case SCA3000_MEAS_MODE_NORMAL: | |
424 | len += sprintf(buf + len, "0 - normal mode\n"); | |
425 | break; | |
426 | case SCA3000_MEAS_MODE_MOT_DET: | |
427 | len += sprintf(buf + len, "3 - motion detection\n"); | |
428 | break; | |
429 | case SCA3000_MEAS_MODE_OP_1: | |
430 | switch (st->info->option_mode_1) { | |
431 | case SCA3000_OP_MODE_NARROW: | |
432 | len += sprintf(buf + len, "1 - narrow mode\n"); | |
433 | break; | |
434 | case SCA3000_OP_MODE_BYPASS: | |
435 | len += sprintf(buf + len, "1 - bypass mode\n"); | |
436 | break; | |
437 | }; | |
438 | break; | |
439 | case SCA3000_MEAS_MODE_OP_2: | |
440 | switch (st->info->option_mode_2) { | |
441 | case SCA3000_OP_MODE_WIDE: | |
442 | len += sprintf(buf + len, "2 - wide mode\n"); | |
443 | break; | |
444 | } | |
445 | break; | |
446 | }; | |
447 | ||
448 | error_ret: | |
449 | mutex_unlock(&st->lock); | |
450 | ||
451 | return ret ? ret : len; | |
452 | } | |
453 | ||
454 | /** | |
455 | * sca3000_store_measurement_mode() set the current mode | |
456 | **/ | |
457 | static ssize_t | |
458 | sca3000_store_measurement_mode(struct device *dev, | |
459 | struct device_attribute *attr, | |
460 | const char *buf, | |
461 | size_t len) | |
462 | { | |
463 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
464 | struct sca3000_state *st = dev_info->dev_data; | |
465 | int ret; | |
466 | u8 *rx; | |
467 | int mask = 0x03; | |
468 | long val; | |
469 | ||
470 | mutex_lock(&st->lock); | |
471 | ret = strict_strtol(buf, 10, &val); | |
472 | if (ret) | |
473 | goto error_ret; | |
474 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
475 | if (ret) | |
476 | goto error_ret; | |
477 | rx[1] &= ~mask; | |
478 | rx[1] |= (val & mask); | |
479 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, rx[1]); | |
480 | if (ret) | |
481 | goto error_free_rx; | |
482 | mutex_unlock(&st->lock); | |
483 | ||
484 | return len; | |
485 | ||
486 | error_free_rx: | |
487 | kfree(rx); | |
488 | error_ret: | |
489 | mutex_unlock(&st->lock); | |
490 | ||
491 | return ret; | |
492 | } | |
493 | ||
494 | ||
495 | /* Not even vaguely standard attributes so defined here rather than | |
496 | * in the relevant IIO core headers | |
497 | */ | |
498 | static IIO_DEVICE_ATTR(available_measurement_modes, S_IRUGO, | |
499 | sca3000_show_available_measurement_modes, | |
500 | NULL, 0); | |
501 | ||
502 | static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR, | |
503 | sca3000_show_measurement_mode, | |
504 | sca3000_store_measurement_mode, | |
505 | 0); | |
506 | ||
507 | /* More standard attributes */ | |
508 | ||
509 | static IIO_DEV_ATTR_NAME(sca3000_show_name); | |
510 | static IIO_DEV_ATTR_REV(sca3000_show_rev); | |
511 | ||
512 | static IIO_DEV_ATTR_ACCEL_X(sca3000_read_13bit_signed, | |
513 | SCA3000_REG_ADDR_X_MSB); | |
514 | static IIO_DEV_ATTR_ACCEL_Y(sca3000_read_13bit_signed, | |
515 | SCA3000_REG_ADDR_Y_MSB); | |
516 | static IIO_DEV_ATTR_ACCEL_Z(sca3000_read_13bit_signed, | |
517 | SCA3000_REG_ADDR_Z_MSB); | |
518 | ||
519 | ||
520 | /** | |
521 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
522 | * | |
523 | * The later modes are only relevant to the ring buffer - and depend on current | |
524 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
525 | * division will give good enough answer and not all chips have them specified | |
526 | * at all. | |
527 | **/ | |
528 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
529 | struct device_attribute *attr, | |
530 | char *buf) | |
531 | { | |
532 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
533 | struct sca3000_state *st = indio_dev->dev_data; | |
534 | int len = 0, ret; | |
535 | u8 *rx; | |
536 | mutex_lock(&st->lock); | |
537 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
538 | mutex_unlock(&st->lock); | |
539 | if (ret) | |
540 | goto error_ret; | |
541 | rx[1] &= 0x03; | |
542 | switch (rx[1]) { | |
543 | case SCA3000_MEAS_MODE_NORMAL: | |
544 | len += sprintf(buf + len, "%d %d %d\n", | |
545 | st->info->measurement_mode_freq, | |
546 | st->info->measurement_mode_freq/2, | |
547 | st->info->measurement_mode_freq/4); | |
548 | break; | |
549 | case SCA3000_MEAS_MODE_OP_1: | |
550 | len += sprintf(buf + len, "%d %d %d\n", | |
551 | st->info->option_mode_1_freq, | |
552 | st->info->option_mode_1_freq/2, | |
553 | st->info->option_mode_1_freq/4); | |
554 | break; | |
555 | case SCA3000_MEAS_MODE_OP_2: | |
556 | len += sprintf(buf + len, "%d %d %d\n", | |
557 | st->info->option_mode_2_freq, | |
558 | st->info->option_mode_2_freq/2, | |
559 | st->info->option_mode_2_freq/4); | |
560 | break; | |
561 | }; | |
562 | kfree(rx); | |
563 | return len; | |
564 | error_ret: | |
565 | return ret; | |
566 | } | |
567 | /** | |
568 | * __sca3000_get_base_frequency() obtain mode specific base frequency | |
569 | * | |
570 | * lock must be held | |
571 | **/ | |
572 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
573 | const struct sca3000_chip_info *info, | |
574 | int *base_freq) | |
575 | { | |
576 | int ret; | |
577 | u8 *rx; | |
578 | ||
579 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
580 | if (ret) | |
581 | goto error_ret; | |
582 | switch (0x03 & rx[1]) { | |
583 | case SCA3000_MEAS_MODE_NORMAL: | |
584 | *base_freq = info->measurement_mode_freq; | |
585 | break; | |
586 | case SCA3000_MEAS_MODE_OP_1: | |
587 | *base_freq = info->option_mode_1_freq; | |
588 | break; | |
589 | case SCA3000_MEAS_MODE_OP_2: | |
590 | *base_freq = info->option_mode_2_freq; | |
591 | break; | |
592 | }; | |
593 | kfree(rx); | |
594 | error_ret: | |
595 | return ret; | |
596 | } | |
597 | ||
598 | /** | |
599 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
600 | **/ | |
601 | static ssize_t sca3000_read_frequency(struct device *dev, | |
602 | struct device_attribute *attr, | |
603 | char *buf) | |
604 | { | |
605 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
606 | struct sca3000_state *st = indio_dev->dev_data; | |
607 | int ret, len = 0, base_freq = 0; | |
608 | u8 *rx; | |
609 | mutex_lock(&st->lock); | |
610 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
611 | if (ret) | |
612 | goto error_ret_mut; | |
613 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, &rx); | |
614 | mutex_unlock(&st->lock); | |
615 | if (ret) | |
616 | goto error_ret; | |
617 | if (base_freq > 0) | |
618 | switch (rx[1]&0x03) { | |
619 | case 0x00: | |
620 | case 0x03: | |
621 | len = sprintf(buf, "%d\n", base_freq); | |
622 | break; | |
623 | case 0x01: | |
624 | len = sprintf(buf, "%d\n", base_freq/2); | |
625 | break; | |
626 | case 0x02: | |
627 | len = sprintf(buf, "%d\n", base_freq/4); | |
628 | break; | |
629 | }; | |
630 | kfree(rx); | |
631 | return len; | |
632 | error_ret_mut: | |
633 | mutex_unlock(&st->lock); | |
634 | error_ret: | |
635 | return ret; | |
636 | } | |
637 | ||
638 | /** | |
639 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
640 | **/ | |
641 | static ssize_t sca3000_set_frequency(struct device *dev, | |
642 | struct device_attribute *attr, | |
643 | const char *buf, | |
644 | size_t len) | |
645 | { | |
646 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
647 | struct sca3000_state *st = indio_dev->dev_data; | |
648 | int ret, base_freq = 0; | |
649 | u8 *rx; | |
650 | long val; | |
651 | ||
652 | ret = strict_strtol(buf, 10, &val); | |
653 | if (ret) | |
654 | return ret; | |
655 | ||
656 | mutex_lock(&st->lock); | |
657 | /* What mode are we in? */ | |
658 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
659 | if (ret) | |
660 | goto error_free_lock; | |
661 | ||
662 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, &rx); | |
663 | if (ret) | |
664 | goto error_free_lock; | |
665 | /* clear the bits */ | |
666 | rx[1] &= ~0x03; | |
667 | ||
668 | if (val == base_freq/2) { | |
669 | rx[1] |= SCA3000_OUT_CTRL_BUF_DIV_2; | |
670 | } else if (val == base_freq/4) { | |
671 | rx[1] |= SCA3000_OUT_CTRL_BUF_DIV_4; | |
672 | } else if (val != base_freq) { | |
673 | ret = -EINVAL; | |
674 | goto error_free_lock; | |
675 | } | |
676 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, rx[1]); | |
677 | error_free_lock: | |
678 | mutex_unlock(&st->lock); | |
679 | ||
680 | return ret ? ret : len; | |
681 | } | |
682 | ||
683 | /* Should only really be registered if ring buffer support is compiled in. | |
684 | * Does no harm however and doing it right would add a fair bit of complexity | |
685 | */ | |
686 | static IIO_DEV_ATTR_AVAIL_SAMP_FREQ(sca3000_read_av_freq); | |
687 | ||
688 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
689 | sca3000_read_frequency, | |
690 | sca3000_set_frequency); | |
691 | ||
692 | ||
693 | /** | |
694 | * sca3000_read_temp() sysfs interface to get the temperature when available | |
695 | * | |
696 | * The alignment of data in here is downright odd. See data sheet. | |
697 | * Converting this into a meaningful value is left to inline functions in | |
698 | * userspace part of header. | |
699 | **/ | |
700 | static ssize_t sca3000_read_temp(struct device *dev, | |
701 | struct device_attribute *attr, | |
702 | char *buf) | |
703 | { | |
704 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
705 | struct sca3000_state *st = indio_dev->dev_data; | |
706 | int len = 0, ret; | |
707 | int val; | |
708 | u8 *rx; | |
709 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_TEMP_MSB, &rx, 2); | |
710 | if (ret < 0) | |
711 | goto error_ret; | |
712 | val = ((rx[1]&0x3F) << 3) | ((rx[2] & 0xE0) >> 5); | |
713 | len += sprintf(buf + len, "%d\n", val); | |
714 | kfree(rx); | |
715 | ||
716 | return len; | |
717 | ||
718 | error_ret: | |
719 | return ret; | |
720 | } | |
721 | static IIO_DEV_ATTR_TEMP(sca3000_read_temp); | |
722 | ||
723 | /** | |
bbc9a991 | 724 | * sca3000_show_thresh() sysfs query of a threshold |
574fb258 JC |
725 | **/ |
726 | static ssize_t sca3000_show_thresh(struct device *dev, | |
727 | struct device_attribute *attr, | |
728 | char *buf) | |
729 | { | |
730 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
731 | struct sca3000_state *st = indio_dev->dev_data; | |
732 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
733 | int len = 0, ret; | |
734 | u8 *rx; | |
735 | ||
736 | mutex_lock(&st->lock); | |
737 | ret = sca3000_read_ctrl_reg(st, | |
738 | this_attr->address, | |
739 | &rx); | |
740 | mutex_unlock(&st->lock); | |
741 | if (ret) | |
742 | return ret; | |
743 | len += sprintf(buf + len, "%d\n", rx[1]); | |
744 | kfree(rx); | |
745 | ||
746 | return len; | |
747 | } | |
748 | ||
749 | /** | |
750 | * sca3000_write_thresh() sysfs control of threshold | |
751 | **/ | |
752 | static ssize_t sca3000_write_thresh(struct device *dev, | |
753 | struct device_attribute *attr, | |
754 | const char *buf, | |
755 | size_t len) | |
756 | { | |
757 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
758 | struct sca3000_state *st = indio_dev->dev_data; | |
759 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
760 | int ret; | |
761 | long val; | |
762 | ||
763 | ret = strict_strtol(buf, 10, &val); | |
764 | if (ret) | |
765 | return ret; | |
766 | mutex_lock(&st->lock); | |
767 | ret = sca3000_write_ctrl_reg(st, this_attr->address, val); | |
768 | mutex_unlock(&st->lock); | |
769 | ||
770 | return ret ? ret : len; | |
771 | } | |
772 | ||
773 | static IIO_DEV_ATTR_ACCEL_THRESH_X(S_IRUGO | S_IWUSR, | |
774 | sca3000_show_thresh, | |
775 | sca3000_write_thresh, | |
776 | SCA3000_REG_CTRL_SEL_MD_X_TH); | |
777 | static IIO_DEV_ATTR_ACCEL_THRESH_Y(S_IRUGO | S_IWUSR, | |
778 | sca3000_show_thresh, | |
779 | sca3000_write_thresh, | |
780 | SCA3000_REG_CTRL_SEL_MD_Y_TH); | |
781 | static IIO_DEV_ATTR_ACCEL_THRESH_Z(S_IRUGO | S_IWUSR, | |
782 | sca3000_show_thresh, | |
783 | sca3000_write_thresh, | |
784 | SCA3000_REG_CTRL_SEL_MD_Z_TH); | |
785 | ||
786 | static struct attribute *sca3000_attributes[] = { | |
787 | &iio_dev_attr_name.dev_attr.attr, | |
788 | &iio_dev_attr_revision.dev_attr.attr, | |
789 | &iio_dev_attr_accel_x.dev_attr.attr, | |
790 | &iio_dev_attr_accel_y.dev_attr.attr, | |
791 | &iio_dev_attr_accel_z.dev_attr.attr, | |
792 | &iio_dev_attr_thresh_accel_x.dev_attr.attr, | |
793 | &iio_dev_attr_thresh_accel_y.dev_attr.attr, | |
794 | &iio_dev_attr_thresh_accel_z.dev_attr.attr, | |
795 | &iio_dev_attr_available_measurement_modes.dev_attr.attr, | |
796 | &iio_dev_attr_measurement_mode.dev_attr.attr, | |
797 | &iio_dev_attr_available_sampling_frequency.dev_attr.attr, | |
798 | &iio_dev_attr_sampling_frequency.dev_attr.attr, | |
799 | NULL, | |
800 | }; | |
801 | ||
802 | static struct attribute *sca3000_attributes_with_temp[] = { | |
803 | &iio_dev_attr_name.dev_attr.attr, | |
804 | &iio_dev_attr_revision.dev_attr.attr, | |
805 | &iio_dev_attr_accel_x.dev_attr.attr, | |
806 | &iio_dev_attr_accel_y.dev_attr.attr, | |
807 | &iio_dev_attr_accel_z.dev_attr.attr, | |
808 | &iio_dev_attr_thresh_accel_x.dev_attr.attr, | |
809 | &iio_dev_attr_thresh_accel_y.dev_attr.attr, | |
810 | &iio_dev_attr_thresh_accel_z.dev_attr.attr, | |
811 | &iio_dev_attr_available_measurement_modes.dev_attr.attr, | |
812 | &iio_dev_attr_measurement_mode.dev_attr.attr, | |
813 | &iio_dev_attr_available_sampling_frequency.dev_attr.attr, | |
814 | &iio_dev_attr_sampling_frequency.dev_attr.attr, | |
815 | /* Only present if temp sensor is */ | |
816 | &iio_dev_attr_temp.dev_attr.attr, | |
817 | NULL, | |
818 | }; | |
819 | ||
820 | static const struct attribute_group sca3000_attribute_group = { | |
821 | .attrs = sca3000_attributes, | |
822 | }; | |
823 | ||
824 | static const struct attribute_group sca3000_attribute_group_with_temp = { | |
825 | .attrs = sca3000_attributes_with_temp, | |
826 | }; | |
827 | ||
828 | /* RING RELATED interrupt handler */ | |
829 | /* depending on event, push to the ring buffer event chrdev or the event one */ | |
830 | ||
831 | /** | |
832 | * sca3000_interrupt_handler_bh() - handling ring and non ring events | |
833 | * | |
834 | * This function is complicated by the fact that the devices can signify ring | |
835 | * and non ring events via the same interrupt line and they can only | |
836 | * be distinguished via a read of the relevant status register. | |
837 | **/ | |
838 | static void sca3000_interrupt_handler_bh(struct work_struct *work_s) | |
839 | { | |
840 | struct sca3000_state *st | |
841 | = container_of(work_s, struct sca3000_state, | |
842 | interrupt_handler_ws); | |
843 | u8 *rx; | |
844 | int ret; | |
845 | ||
846 | /* Could lead if badly timed to an extra read of status reg, | |
847 | * but ensures no interrupt is missed. | |
848 | */ | |
849 | enable_irq(st->us->irq); | |
850 | mutex_lock(&st->lock); | |
851 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_INT_STATUS, | |
852 | &rx, 1); | |
853 | mutex_unlock(&st->lock); | |
854 | if (ret) | |
855 | goto done; | |
856 | ||
857 | sca3000_ring_int_process(rx[1], st->indio_dev->ring); | |
858 | ||
859 | if (rx[1] & SCA3000_INT_STATUS_FREE_FALL) | |
860 | iio_push_event(st->indio_dev, 0, | |
861 | IIO_EVENT_CODE_FREE_FALL, | |
862 | st->last_timestamp); | |
863 | ||
864 | if (rx[1] & SCA3000_INT_STATUS_Y_TRIGGER) | |
865 | iio_push_event(st->indio_dev, 0, | |
866 | IIO_EVENT_CODE_ACCEL_Y_HIGH, | |
867 | st->last_timestamp); | |
868 | ||
869 | if (rx[1] & SCA3000_INT_STATUS_X_TRIGGER) | |
870 | iio_push_event(st->indio_dev, 0, | |
871 | IIO_EVENT_CODE_ACCEL_X_HIGH, | |
872 | st->last_timestamp); | |
873 | ||
874 | if (rx[1] & SCA3000_INT_STATUS_Z_TRIGGER) | |
875 | iio_push_event(st->indio_dev, 0, | |
876 | IIO_EVENT_CODE_ACCEL_Z_HIGH, | |
877 | st->last_timestamp); | |
878 | ||
879 | done: | |
880 | kfree(rx); | |
881 | return; | |
882 | } | |
883 | ||
884 | /** | |
885 | * sca3000_handler_th() handles all interrupt events from device | |
886 | * | |
887 | * These devices deploy unified interrupt status registers meaning | |
888 | * all interrupts must be handled together | |
889 | **/ | |
890 | static int sca3000_handler_th(struct iio_dev *dev_info, | |
891 | int index, | |
892 | s64 timestamp, | |
893 | int no_test) | |
894 | { | |
895 | struct sca3000_state *st = dev_info->dev_data; | |
896 | ||
897 | st->last_timestamp = timestamp; | |
898 | schedule_work(&st->interrupt_handler_ws); | |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
903 | /** | |
904 | * sca3000_query_mo_det() is motion detection enabled for this axis | |
905 | * | |
906 | * First queries if motion detection is enabled and then if this axis is | |
907 | * on. | |
908 | **/ | |
909 | static ssize_t sca3000_query_mo_det(struct device *dev, | |
910 | struct device_attribute *attr, | |
911 | char *buf) | |
912 | { | |
913 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
914 | struct sca3000_state *st = indio_dev->dev_data; | |
915 | struct iio_event_attr *this_attr = to_iio_event_attr(attr); | |
916 | int ret, len = 0; | |
917 | u8 *rx; | |
918 | u8 protect_mask = 0x03; | |
919 | ||
920 | /* read current value of mode register */ | |
921 | mutex_lock(&st->lock); | |
922 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
923 | if (ret) | |
924 | goto error_ret; | |
925 | ||
926 | if ((rx[1]&protect_mask) != SCA3000_MEAS_MODE_MOT_DET) | |
927 | len += sprintf(buf + len, "0\n"); | |
928 | else { | |
929 | kfree(rx); | |
930 | ret = sca3000_read_ctrl_reg(st, | |
931 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
932 | &rx); | |
933 | if (ret) | |
934 | goto error_ret; | |
935 | /* only supporting logical or's for now */ | |
936 | len += sprintf(buf + len, "%d\n", | |
937 | (rx[1] & this_attr->mask) ? 1 : 0); | |
938 | } | |
939 | kfree(rx); | |
940 | error_ret: | |
941 | mutex_unlock(&st->lock); | |
942 | ||
943 | return ret ? ret : len; | |
944 | } | |
945 | /** | |
946 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
947 | **/ | |
948 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
949 | struct device_attribute *attr, | |
950 | char *buf) | |
951 | { | |
952 | int ret, len; | |
953 | u8 *rx; | |
954 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
955 | struct sca3000_state *st = indio_dev->dev_data; | |
956 | ||
957 | mutex_lock(&st->lock); | |
958 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
959 | mutex_unlock(&st->lock); | |
960 | if (ret) | |
961 | return ret; | |
962 | len = sprintf(buf, "%d\n", | |
963 | !!(rx[1] & SCA3000_FREE_FALL_DETECT)); | |
964 | kfree(rx); | |
965 | ||
966 | return len; | |
967 | } | |
968 | /** | |
969 | * sca3000_query_ring_int() is the hardware ring status interrupt enabled | |
970 | **/ | |
971 | static ssize_t sca3000_query_ring_int(struct device *dev, | |
972 | struct device_attribute *attr, | |
973 | char *buf) | |
974 | { | |
975 | struct iio_event_attr *this_attr = to_iio_event_attr(attr); | |
976 | int ret, len; | |
977 | u8 *rx; | |
978 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
979 | struct sca3000_state *st = indio_dev->dev_data; | |
980 | mutex_lock(&st->lock); | |
981 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_INT_MASK, &rx, 1); | |
982 | mutex_unlock(&st->lock); | |
983 | if (ret) | |
984 | return ret; | |
985 | len = sprintf(buf, "%d\n", (rx[1] & this_attr->mask) ? 1 : 0); | |
986 | kfree(rx); | |
987 | ||
988 | return len; | |
989 | } | |
990 | /** | |
991 | * sca3000_set_ring_int() set state of ring status interrupt | |
992 | **/ | |
993 | static ssize_t sca3000_set_ring_int(struct device *dev, | |
994 | struct device_attribute *attr, | |
995 | const char *buf, | |
996 | size_t len) | |
997 | { | |
998 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
999 | struct sca3000_state *st = indio_dev->dev_data; | |
1000 | struct iio_event_attr *this_attr = to_iio_event_attr(attr); | |
1001 | ||
1002 | long val; | |
1003 | int ret; | |
1004 | u8 *rx; | |
1005 | ||
1006 | mutex_lock(&st->lock); | |
1007 | ret = strict_strtol(buf, 10, &val); | |
1008 | if (ret) | |
1009 | goto error_ret; | |
1010 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_INT_MASK, &rx, 1); | |
1011 | if (ret) | |
1012 | goto error_ret; | |
1013 | if (val) | |
1014 | ret = sca3000_write_reg(st, | |
1015 | SCA3000_REG_ADDR_INT_MASK, | |
1016 | rx[1] | this_attr->mask); | |
1017 | else | |
1018 | ret = sca3000_write_reg(st, | |
1019 | SCA3000_REG_ADDR_INT_MASK, | |
1020 | rx[1] & ~this_attr->mask); | |
1021 | kfree(rx); | |
1022 | error_ret: | |
1023 | mutex_unlock(&st->lock); | |
1024 | ||
1025 | return ret ? ret : len; | |
1026 | } | |
1027 | ||
1028 | /** | |
1029 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
1030 | * | |
1031 | * In these chips the free fall detector should send an interrupt if | |
1032 | * the device falls more than 25cm. This has not been tested due | |
1033 | * to fragile wiring. | |
1034 | **/ | |
1035 | ||
1036 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, | |
1037 | struct device_attribute *attr, | |
1038 | const char *buf, | |
1039 | size_t len) | |
1040 | { | |
1041 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
1042 | struct sca3000_state *st = indio_dev->dev_data; | |
1043 | long val; | |
1044 | int ret; | |
1045 | u8 *rx; | |
1046 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; | |
1047 | ||
1048 | mutex_lock(&st->lock); | |
1049 | ret = strict_strtol(buf, 10, &val); | |
1050 | if (ret) | |
1051 | goto error_ret; | |
1052 | ||
1053 | /* read current value of mode register */ | |
1054 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
1055 | if (ret) | |
1056 | goto error_ret; | |
1057 | ||
1058 | /*if off and should be on*/ | |
1059 | if (val && !(rx[1] & protect_mask)) | |
1060 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, | |
1061 | (rx[1] | SCA3000_FREE_FALL_DETECT)); | |
1062 | /* if on and should be off */ | |
1063 | else if (!val && (rx[1]&protect_mask)) | |
1064 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, | |
1065 | (rx[1] & ~protect_mask)); | |
1066 | ||
1067 | kfree(rx); | |
1068 | error_ret: | |
1069 | mutex_unlock(&st->lock); | |
1070 | ||
1071 | return ret ? ret : len; | |
1072 | } | |
1073 | ||
1074 | /** | |
1075 | * sca3000_set_mo_det() simple on off control for motion detector | |
1076 | * | |
1077 | * This is a per axis control, but enabling any will result in the | |
1078 | * motion detector unit being enabled. | |
1079 | * N.B. enabling motion detector stops normal data acquisition. | |
1080 | * There is a complexity in knowing which mode to return to when | |
1081 | * this mode is disabled. Currently normal mode is assumed. | |
1082 | **/ | |
1083 | static ssize_t sca3000_set_mo_det(struct device *dev, | |
1084 | struct device_attribute *attr, | |
1085 | const char *buf, | |
1086 | size_t len) | |
1087 | { | |
1088 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
1089 | struct sca3000_state *st = indio_dev->dev_data; | |
1090 | struct iio_event_attr *this_attr = to_iio_event_attr(attr); | |
1091 | long val; | |
1092 | int ret; | |
1093 | u8 *rx; | |
1094 | u8 protect_mask = 0x03; | |
1095 | ret = strict_strtol(buf, 10, &val); | |
1096 | if (ret) | |
1097 | return ret; | |
1098 | ||
1099 | mutex_lock(&st->lock); | |
1100 | /* First read the motion detector config to find out if | |
1101 | * this axis is on*/ | |
1102 | ret = sca3000_read_ctrl_reg(st, | |
1103 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
1104 | &rx); | |
1105 | if (ret) | |
1106 | goto exit_point; | |
1107 | /* Off and should be on */ | |
1108 | if (val && !(rx[1] & this_attr->mask)) { | |
1109 | ret = sca3000_write_ctrl_reg(st, | |
1110 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
1111 | rx[1] | this_attr->mask); | |
1112 | if (ret) | |
1113 | goto exit_point_free_rx; | |
1114 | st->mo_det_use_count++; | |
1115 | } else if (!val && (rx[1]&this_attr->mask)) { | |
1116 | ret = sca3000_write_ctrl_reg(st, | |
1117 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
1118 | rx[1] & ~(this_attr->mask)); | |
1119 | if (ret) | |
1120 | goto exit_point_free_rx; | |
1121 | st->mo_det_use_count--; | |
1122 | } else /* relies on clean state for device on boot */ | |
1123 | goto exit_point_free_rx; | |
1124 | kfree(rx); | |
1125 | /* read current value of mode register */ | |
1126 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1); | |
1127 | if (ret) | |
1128 | goto exit_point; | |
1129 | /*if off and should be on*/ | |
1130 | if ((st->mo_det_use_count) | |
1131 | && ((rx[1]&protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) | |
1132 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, | |
1133 | (rx[1] & ~protect_mask) | |
1134 | | SCA3000_MEAS_MODE_MOT_DET); | |
1135 | /* if on and should be off */ | |
1136 | else if (!(st->mo_det_use_count) | |
1137 | && ((rx[1]&protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) | |
1138 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, | |
1139 | (rx[1] & ~protect_mask)); | |
1140 | exit_point_free_rx: | |
1141 | kfree(rx); | |
1142 | exit_point: | |
1143 | mutex_unlock(&st->lock); | |
1144 | ||
1145 | return ret ? ret : len; | |
1146 | } | |
1147 | ||
1148 | /* Shared event handler for all events as single event status register */ | |
1149 | IIO_EVENT_SH(all, &sca3000_handler_th); | |
1150 | ||
1151 | /* Free fall detector related event attribute */ | |
1152 | IIO_EVENT_ATTR_FREE_FALL_DETECT_SH(iio_event_all, | |
1153 | sca3000_query_free_fall_mode, | |
1154 | sca3000_set_free_fall_mode, | |
1155 | 0) | |
1156 | ||
1157 | /* Motion detector related event attributes */ | |
1158 | IIO_EVENT_ATTR_ACCEL_X_HIGH_SH(iio_event_all, | |
1159 | sca3000_query_mo_det, | |
1160 | sca3000_set_mo_det, | |
1161 | SCA3000_MD_CTRL_OR_X); | |
1162 | ||
1163 | IIO_EVENT_ATTR_ACCEL_Y_HIGH_SH(iio_event_all, | |
1164 | sca3000_query_mo_det, | |
1165 | sca3000_set_mo_det, | |
1166 | SCA3000_MD_CTRL_OR_Y); | |
1167 | ||
1168 | IIO_EVENT_ATTR_ACCEL_Z_HIGH_SH(iio_event_all, | |
1169 | sca3000_query_mo_det, | |
1170 | sca3000_set_mo_det, | |
1171 | SCA3000_MD_CTRL_OR_Z); | |
1172 | ||
1173 | /* Hardware ring buffer related event attributes */ | |
1174 | IIO_EVENT_ATTR_RING_50_FULL_SH(iio_event_all, | |
1175 | sca3000_query_ring_int, | |
1176 | sca3000_set_ring_int, | |
1177 | SCA3000_INT_MASK_RING_HALF); | |
1178 | ||
1179 | IIO_EVENT_ATTR_RING_75_FULL_SH(iio_event_all, | |
1180 | sca3000_query_ring_int, | |
1181 | sca3000_set_ring_int, | |
1182 | SCA3000_INT_MASK_RING_THREE_QUARTER); | |
1183 | ||
1184 | static struct attribute *sca3000_event_attributes[] = { | |
1185 | &iio_event_attr_free_fall.dev_attr.attr, | |
1186 | &iio_event_attr_accel_x_high.dev_attr.attr, | |
1187 | &iio_event_attr_accel_y_high.dev_attr.attr, | |
1188 | &iio_event_attr_accel_z_high.dev_attr.attr, | |
1189 | &iio_event_attr_ring_50_full.dev_attr.attr, | |
1190 | &iio_event_attr_ring_75_full.dev_attr.attr, | |
1191 | NULL, | |
1192 | }; | |
1193 | ||
1194 | static struct attribute_group sca3000_event_attribute_group = { | |
1195 | .attrs = sca3000_event_attributes, | |
1196 | }; | |
1197 | ||
1198 | /** | |
1199 | * sca3000_clean_setup() get the device into a predictable state | |
1200 | * | |
1201 | * Devices use flash memory to store many of the register values | |
1202 | * and hence can come up in somewhat unpredictable states. | |
1203 | * Hence reset everything on driver load. | |
1204 | **/ | |
1205 | static int sca3000_clean_setup(struct sca3000_state *st) | |
1206 | { | |
1207 | int ret; | |
1208 | u8 *rx; | |
1209 | ||
1210 | mutex_lock(&st->lock); | |
1211 | /* Ensure all interrupts have been acknowledged */ | |
1212 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_INT_STATUS, &rx, 1); | |
1213 | if (ret) | |
1214 | goto error_ret; | |
1215 | kfree(rx); | |
1216 | ||
1217 | /* Turn off all motion detection channels */ | |
1218 | ret = sca3000_read_ctrl_reg(st, | |
1219 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
1220 | &rx); | |
1221 | if (ret) | |
1222 | goto error_ret; | |
1223 | ret = sca3000_write_ctrl_reg(st, | |
1224 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
1225 | rx[1] & SCA3000_MD_CTRL_PROT_MASK); | |
1226 | kfree(rx); | |
1227 | if (ret) | |
1228 | goto error_ret; | |
1229 | ||
1230 | /* Disable ring buffer */ | |
1231 | sca3000_read_ctrl_reg(st, | |
1232 | SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1233 | &rx); | |
1234 | /* Frequency of ring buffer sampling deliberately restricted to make | |
1235 | * debugging easier - add control of this later */ | |
1236 | ret = sca3000_write_ctrl_reg(st, | |
1237 | SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1238 | (rx[1] & SCA3000_OUT_CTRL_PROT_MASK) | |
1239 | | SCA3000_OUT_CTRL_BUF_X_EN | |
1240 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1241 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1242 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
1243 | kfree(rx); | |
1244 | ||
1245 | if (ret) | |
1246 | goto error_ret; | |
1247 | /* Enable interrupts, relevant to mode and set up as active low */ | |
1248 | ret = sca3000_read_data(st, | |
1249 | SCA3000_REG_ADDR_INT_MASK, | |
1250 | &rx, 1); | |
1251 | if (ret) | |
1252 | goto error_ret; | |
1253 | ret = sca3000_write_reg(st, | |
1254 | SCA3000_REG_ADDR_INT_MASK, | |
1255 | (rx[1] & SCA3000_INT_MASK_PROT_MASK) | |
1256 | | SCA3000_INT_MASK_ACTIVE_LOW); | |
1257 | kfree(rx); | |
1258 | if (ret) | |
1259 | goto error_ret; | |
1260 | /* Select normal measurement mode, free fall off, ring off */ | |
1261 | /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1262 | * as that occurs in one of the example on the datasheet */ | |
1263 | ret = sca3000_read_data(st, | |
1264 | SCA3000_REG_ADDR_MODE, | |
1265 | &rx, 1); | |
1266 | if (ret) | |
1267 | goto error_ret; | |
1268 | ret = sca3000_write_reg(st, | |
1269 | SCA3000_REG_ADDR_MODE, | |
1270 | (rx[1] & SCA3000_MODE_PROT_MASK)); | |
1271 | kfree(rx); | |
1272 | st->bpse = 11; | |
1273 | ||
1274 | error_ret: | |
1275 | mutex_unlock(&st->lock); | |
1276 | return ret; | |
1277 | } | |
1278 | ||
1279 | static int __devinit __sca3000_probe(struct spi_device *spi, | |
1280 | enum sca3000_variant variant) | |
1281 | { | |
1282 | int ret, regdone = 0; | |
1283 | struct sca3000_state *st; | |
1284 | ||
1285 | st = kzalloc(sizeof(struct sca3000_state), GFP_KERNEL); | |
1286 | if (st == NULL) { | |
1287 | ret = -ENOMEM; | |
1288 | goto error_ret; | |
1289 | } | |
1290 | spi_set_drvdata(spi, st); | |
1291 | ||
1292 | st->tx = kmalloc(sizeof(*st->tx)*6, GFP_KERNEL); | |
1293 | if (st->tx == NULL) { | |
1294 | ret = -ENOMEM; | |
1295 | goto error_clear_st; | |
1296 | } | |
1297 | st->rx = kmalloc(sizeof(*st->rx)*3, GFP_KERNEL); | |
1298 | if (st->rx == NULL) { | |
1299 | ret = -ENOMEM; | |
1300 | goto error_free_tx; | |
1301 | } | |
1302 | st->us = spi; | |
1303 | mutex_init(&st->lock); | |
1304 | st->info = &sca3000_spi_chip_info_tbl[variant]; | |
1305 | ||
1306 | st->indio_dev = iio_allocate_device(); | |
1307 | if (st->indio_dev == NULL) { | |
1308 | ret = -ENOMEM; | |
1309 | goto error_free_rx; | |
1310 | } | |
1311 | ||
1312 | st->indio_dev->dev.parent = &spi->dev; | |
1313 | st->indio_dev->num_interrupt_lines = 1; | |
1314 | st->indio_dev->event_attrs = &sca3000_event_attribute_group; | |
1315 | if (st->info->temp_output) | |
1316 | st->indio_dev->attrs = &sca3000_attribute_group_with_temp; | |
1317 | else | |
1318 | st->indio_dev->attrs = &sca3000_attribute_group; | |
1319 | st->indio_dev->dev_data = (void *)(st); | |
1320 | st->indio_dev->modes = INDIO_DIRECT_MODE; | |
1321 | ||
1322 | sca3000_configure_ring(st->indio_dev); | |
1323 | ||
1324 | ret = iio_device_register(st->indio_dev); | |
1325 | if (ret < 0) | |
1326 | goto error_free_dev; | |
1327 | regdone = 1; | |
1328 | ret = iio_ring_buffer_register(st->indio_dev->ring); | |
1329 | if (ret < 0) | |
1330 | goto error_unregister_dev; | |
1331 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) { | |
1332 | INIT_WORK(&st->interrupt_handler_ws, | |
1333 | sca3000_interrupt_handler_bh); | |
1334 | ret = iio_register_interrupt_line(spi->irq, | |
1335 | st->indio_dev, | |
1336 | 0, | |
1337 | IRQF_TRIGGER_FALLING, | |
1338 | "sca3000"); | |
1339 | if (ret) | |
1340 | goto error_unregister_ring; | |
1341 | /* RFC | |
1342 | * Probably a common situation. All interrupts need an ack | |
1343 | * and there is only one handler so the complicated list system | |
1344 | * is overkill. At very least a simpler registration method | |
1345 | * might be worthwhile. | |
1346 | */ | |
1347 | iio_add_event_to_list(iio_event_attr_accel_z_high.listel, | |
1348 | &st->indio_dev | |
1349 | ->interrupts[0]->ev_list); | |
1350 | } | |
1351 | sca3000_register_ring_funcs(st->indio_dev); | |
1352 | ret = sca3000_clean_setup(st); | |
1353 | if (ret) | |
1354 | goto error_unregister_interrupt_line; | |
1355 | return 0; | |
1356 | ||
1357 | error_unregister_interrupt_line: | |
1358 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) | |
1359 | iio_unregister_interrupt_line(st->indio_dev, 0); | |
1360 | error_unregister_ring: | |
1361 | iio_ring_buffer_unregister(st->indio_dev->ring); | |
1362 | error_unregister_dev: | |
1363 | error_free_dev: | |
1364 | if (regdone) | |
1365 | iio_device_unregister(st->indio_dev); | |
1366 | else | |
1367 | iio_free_device(st->indio_dev); | |
1368 | error_free_rx: | |
1369 | kfree(st->rx); | |
1370 | error_free_tx: | |
1371 | kfree(st->tx); | |
1372 | error_clear_st: | |
1373 | kfree(st); | |
1374 | error_ret: | |
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1379 | { | |
1380 | int ret; | |
1381 | u8 *rx; | |
1382 | ||
1383 | mutex_lock(&st->lock); | |
1384 | ret = sca3000_read_data(st, SCA3000_REG_ADDR_INT_MASK, &rx, 1); | |
1385 | if (ret) | |
1386 | goto error_ret; | |
1387 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
1388 | (rx[1] & ~(SCA3000_INT_MASK_RING_THREE_QUARTER | |
1389 | | SCA3000_INT_MASK_RING_HALF | |
1390 | | SCA3000_INT_MASK_ALL_INTS))); | |
1391 | error_ret: | |
1392 | kfree(rx); | |
1393 | return ret; | |
1394 | ||
1395 | } | |
1396 | ||
1397 | static int sca3000_remove(struct spi_device *spi) | |
1398 | { | |
1399 | struct sca3000_state *st = spi_get_drvdata(spi); | |
1400 | struct iio_dev *indio_dev = st->indio_dev; | |
1401 | int ret; | |
1402 | /* Must ensure no interrupts can be generated after this!*/ | |
1403 | ret = sca3000_stop_all_interrupts(st); | |
1404 | if (ret) | |
1405 | return ret; | |
1406 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) | |
1407 | iio_unregister_interrupt_line(indio_dev, 0); | |
1408 | iio_ring_buffer_unregister(indio_dev->ring); | |
1409 | sca3000_unconfigure_ring(indio_dev); | |
1410 | iio_device_unregister(indio_dev); | |
1411 | ||
1412 | kfree(st->tx); | |
1413 | kfree(st->rx); | |
1414 | kfree(st); | |
1415 | ||
1416 | return 0; | |
1417 | } | |
1418 | ||
1419 | /* These macros save on an awful lot of repeated code */ | |
1420 | #define SCA3000_VARIANT_PROBE(_name) \ | |
1421 | static int __devinit \ | |
1422 | sca3000_##_name##_probe(struct spi_device *spi) \ | |
1423 | { \ | |
1424 | return __sca3000_probe(spi, _name); \ | |
1425 | } | |
1426 | ||
1427 | #define SCA3000_VARIANT_SPI_DRIVER(_name) \ | |
1428 | struct spi_driver sca3000_##_name##_driver = { \ | |
1429 | .driver = { \ | |
1430 | .name = "sca3000_" #_name, \ | |
1431 | .owner = THIS_MODULE, \ | |
1432 | }, \ | |
1433 | .probe = sca3000_##_name##_probe, \ | |
1434 | .remove = __devexit_p(sca3000_remove), \ | |
1435 | } | |
1436 | ||
1437 | SCA3000_VARIANT_PROBE(d01); | |
1438 | static SCA3000_VARIANT_SPI_DRIVER(d01); | |
1439 | ||
1440 | SCA3000_VARIANT_PROBE(d03); | |
1441 | static SCA3000_VARIANT_SPI_DRIVER(d03); | |
1442 | ||
1443 | SCA3000_VARIANT_PROBE(e02); | |
1444 | static SCA3000_VARIANT_SPI_DRIVER(e02); | |
1445 | ||
1446 | SCA3000_VARIANT_PROBE(e04); | |
1447 | static SCA3000_VARIANT_SPI_DRIVER(e04); | |
1448 | ||
1449 | SCA3000_VARIANT_PROBE(e05); | |
1450 | static SCA3000_VARIANT_SPI_DRIVER(e05); | |
1451 | ||
1452 | SCA3000_VARIANT_PROBE(l01); | |
1453 | static SCA3000_VARIANT_SPI_DRIVER(l01); | |
1454 | ||
1455 | static __init int sca3000_init(void) | |
1456 | { | |
1457 | int ret; | |
1458 | ||
1459 | ret = spi_register_driver(&sca3000_d01_driver); | |
1460 | if (ret) | |
1461 | goto error_ret; | |
1462 | ret = spi_register_driver(&sca3000_d03_driver); | |
1463 | if (ret) | |
1464 | goto error_unreg_d01; | |
1465 | ret = spi_register_driver(&sca3000_e02_driver); | |
1466 | if (ret) | |
1467 | goto error_unreg_d03; | |
1468 | ret = spi_register_driver(&sca3000_e04_driver); | |
1469 | if (ret) | |
1470 | goto error_unreg_e02; | |
1471 | ret = spi_register_driver(&sca3000_e05_driver); | |
1472 | if (ret) | |
1473 | goto error_unreg_e04; | |
1474 | ret = spi_register_driver(&sca3000_l01_driver); | |
1475 | if (ret) | |
1476 | goto error_unreg_e05; | |
1477 | ||
1478 | return 0; | |
1479 | ||
1480 | error_unreg_e05: | |
1481 | spi_unregister_driver(&sca3000_e05_driver); | |
1482 | error_unreg_e04: | |
1483 | spi_unregister_driver(&sca3000_e04_driver); | |
1484 | error_unreg_e02: | |
1485 | spi_unregister_driver(&sca3000_e02_driver); | |
1486 | error_unreg_d03: | |
1487 | spi_unregister_driver(&sca3000_d03_driver); | |
1488 | error_unreg_d01: | |
1489 | spi_unregister_driver(&sca3000_d01_driver); | |
1490 | error_ret: | |
1491 | ||
1492 | return ret; | |
1493 | } | |
1494 | ||
1495 | static __exit void sca3000_exit(void) | |
1496 | { | |
1497 | spi_unregister_driver(&sca3000_l01_driver); | |
1498 | spi_unregister_driver(&sca3000_e05_driver); | |
1499 | spi_unregister_driver(&sca3000_e04_driver); | |
1500 | spi_unregister_driver(&sca3000_e02_driver); | |
1501 | spi_unregister_driver(&sca3000_d03_driver); | |
1502 | spi_unregister_driver(&sca3000_d01_driver); | |
1503 | } | |
1504 | ||
1505 | module_init(sca3000_init); | |
1506 | module_exit(sca3000_exit); | |
1507 | ||
1508 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
1509 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); | |
1510 | MODULE_LICENSE("GPL v2"); |