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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, | |
574fb258 JC |
30 | e02, |
31 | e04, | |
32 | e05, | |
574fb258 JC |
33 | }; |
34 | ||
35 | /* Note where option modes are not defined, the chip simply does not | |
36 | * support any. | |
37 | * Other chips in the sca3000 series use i2c and are not included here. | |
38 | * | |
39 | * Some of these devices are only listed in the family data sheet and | |
40 | * do not actually appear to be available. | |
41 | */ | |
42 | static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = { | |
845bd12a | 43 | [d01] = { |
25888dc5 | 44 | .scale = 7357, |
574fb258 JC |
45 | .temp_output = true, |
46 | .measurement_mode_freq = 250, | |
47 | .option_mode_1 = SCA3000_OP_MODE_BYPASS, | |
48 | .option_mode_1_freq = 250, | |
25888dc5 JC |
49 | .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300}, |
50 | .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750}, | |
845bd12a JC |
51 | }, |
52 | [e02] = { | |
25888dc5 | 53 | .scale = 9810, |
574fb258 JC |
54 | .measurement_mode_freq = 125, |
55 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
56 | .option_mode_1_freq = 63, | |
25888dc5 JC |
57 | .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050}, |
58 | .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700}, | |
845bd12a JC |
59 | }, |
60 | [e04] = { | |
25888dc5 | 61 | .scale = 19620, |
574fb258 JC |
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, | |
25888dc5 JC |
67 | .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100}, |
68 | .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000}, | |
845bd12a JC |
69 | }, |
70 | [e05] = { | |
25888dc5 | 71 | .scale = 61313, |
574fb258 JC |
72 | .measurement_mode_freq = 200, |
73 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
74 | .option_mode_1_freq = 50, | |
75 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
76 | .option_mode_2_freq = 400, | |
25888dc5 JC |
77 | .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900}, |
78 | .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600}, | |
574fb258 JC |
79 | }, |
80 | }; | |
81 | ||
574fb258 JC |
82 | int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val) |
83 | { | |
574fb258 JC |
84 | st->tx[0] = SCA3000_WRITE_REG(address); |
85 | st->tx[1] = val; | |
25888dc5 | 86 | return spi_write(st->us, st->tx, 2); |
574fb258 JC |
87 | } |
88 | ||
25888dc5 JC |
89 | int sca3000_read_data_short(struct sca3000_state *st, |
90 | uint8_t reg_address_high, | |
91 | int len) | |
574fb258 | 92 | { |
574fb258 | 93 | struct spi_message msg; |
25888dc5 JC |
94 | struct spi_transfer xfer[2] = { |
95 | { | |
96 | .len = 1, | |
97 | .tx_buf = st->tx, | |
98 | }, { | |
99 | .len = len, | |
100 | .rx_buf = st->rx, | |
101 | } | |
574fb258 | 102 | }; |
574fb258 JC |
103 | st->tx[0] = SCA3000_READ_REG(reg_address_high); |
104 | spi_message_init(&msg); | |
25888dc5 JC |
105 | spi_message_add_tail(&xfer[0], &msg); |
106 | spi_message_add_tail(&xfer[1], &msg); | |
574fb258 | 107 | |
25888dc5 | 108 | return spi_sync(st->us, &msg); |
574fb258 | 109 | } |
25888dc5 | 110 | |
574fb258 JC |
111 | /** |
112 | * sca3000_reg_lock_on() test if the ctrl register lock is on | |
113 | * | |
114 | * Lock must be held. | |
115 | **/ | |
116 | static int sca3000_reg_lock_on(struct sca3000_state *st) | |
117 | { | |
574fb258 JC |
118 | int ret; |
119 | ||
25888dc5 | 120 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
121 | if (ret < 0) |
122 | return ret; | |
574fb258 | 123 | |
25888dc5 | 124 | return !(st->rx[0] & SCA3000_LOCKED); |
574fb258 JC |
125 | } |
126 | ||
127 | /** | |
128 | * __sca3000_unlock_reg_lock() unlock the control registers | |
129 | * | |
130 | * Note the device does not appear to support doing this in a single transfer. | |
131 | * This should only ever be used as part of ctrl reg read. | |
132 | * Lock must be held before calling this | |
133 | **/ | |
134 | static int __sca3000_unlock_reg_lock(struct sca3000_state *st) | |
135 | { | |
136 | struct spi_message msg; | |
137 | struct spi_transfer xfer[3] = { | |
138 | { | |
574fb258 JC |
139 | .len = 2, |
140 | .cs_change = 1, | |
141 | .tx_buf = st->tx, | |
142 | }, { | |
574fb258 JC |
143 | .len = 2, |
144 | .cs_change = 1, | |
145 | .tx_buf = st->tx + 2, | |
146 | }, { | |
574fb258 | 147 | .len = 2, |
574fb258 JC |
148 | .tx_buf = st->tx + 4, |
149 | }, | |
150 | }; | |
151 | st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
152 | st->tx[1] = 0x00; | |
153 | st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
154 | st->tx[3] = 0x50; | |
155 | st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
156 | st->tx[5] = 0xA0; | |
157 | spi_message_init(&msg); | |
158 | spi_message_add_tail(&xfer[0], &msg); | |
159 | spi_message_add_tail(&xfer[1], &msg); | |
160 | spi_message_add_tail(&xfer[2], &msg); | |
161 | ||
162 | return spi_sync(st->us, &msg); | |
163 | } | |
164 | ||
165 | /** | |
166 | * sca3000_write_ctrl_reg() write to a lock protect ctrl register | |
167 | * @sel: selects which registers we wish to write to | |
168 | * @val: the value to be written | |
169 | * | |
170 | * Certain control registers are protected against overwriting by the lock | |
171 | * register and use a shared write address. This function allows writing of | |
172 | * these registers. | |
173 | * Lock must be held. | |
174 | **/ | |
175 | static int sca3000_write_ctrl_reg(struct sca3000_state *st, | |
176 | uint8_t sel, | |
177 | uint8_t val) | |
178 | { | |
179 | ||
180 | int ret; | |
181 | ||
182 | ret = sca3000_reg_lock_on(st); | |
183 | if (ret < 0) | |
184 | goto error_ret; | |
185 | if (ret) { | |
186 | ret = __sca3000_unlock_reg_lock(st); | |
187 | if (ret) | |
188 | goto error_ret; | |
189 | } | |
190 | ||
191 | /* Set the control select register */ | |
192 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel); | |
193 | if (ret) | |
194 | goto error_ret; | |
195 | ||
196 | /* Write the actual value into the register */ | |
197 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val); | |
198 | ||
199 | error_ret: | |
200 | return ret; | |
201 | } | |
202 | ||
203 | /* Crucial that lock is called before calling this */ | |
204 | /** | |
205 | * sca3000_read_ctrl_reg() read from lock protected control register. | |
206 | * | |
207 | * Lock must be held. | |
208 | **/ | |
209 | static int sca3000_read_ctrl_reg(struct sca3000_state *st, | |
25888dc5 | 210 | u8 ctrl_reg) |
574fb258 JC |
211 | { |
212 | int ret; | |
213 | ||
214 | ret = sca3000_reg_lock_on(st); | |
215 | if (ret < 0) | |
216 | goto error_ret; | |
217 | if (ret) { | |
218 | ret = __sca3000_unlock_reg_lock(st); | |
219 | if (ret) | |
220 | goto error_ret; | |
221 | } | |
222 | /* Set the control select register */ | |
223 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg); | |
224 | if (ret) | |
225 | goto error_ret; | |
25888dc5 JC |
226 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1); |
227 | if (ret) | |
228 | goto error_ret; | |
229 | else | |
230 | return st->rx[0]; | |
574fb258 JC |
231 | error_ret: |
232 | return ret; | |
233 | } | |
234 | ||
235 | #ifdef SCA3000_DEBUG | |
236 | /** | |
237 | * sca3000_check_status() check the status register | |
238 | * | |
239 | * Only used for debugging purposes | |
240 | **/ | |
241 | static int sca3000_check_status(struct device *dev) | |
242 | { | |
574fb258 JC |
243 | int ret; |
244 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
245 | struct sca3000_state *st = indio_dev->dev_data; | |
246 | ||
247 | mutex_lock(&st->lock); | |
25888dc5 | 248 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
249 | if (ret < 0) |
250 | goto error_ret; | |
25888dc5 | 251 | if (st->rx[0] & SCA3000_EEPROM_CS_ERROR) |
26de7208 | 252 | dev_err(dev, "eeprom error\n"); |
25888dc5 | 253 | if (st->rx[0] & SCA3000_SPI_FRAME_ERROR) |
574fb258 | 254 | dev_err(dev, "Previous SPI Frame was corrupt\n"); |
574fb258 JC |
255 | |
256 | error_ret: | |
257 | mutex_unlock(&st->lock); | |
258 | return ret; | |
259 | } | |
260 | #endif /* SCA3000_DEBUG */ | |
261 | ||
845bd12a | 262 | |
574fb258 JC |
263 | /** |
264 | * sca3000_show_reg() - sysfs interface to read the chip revision number | |
265 | **/ | |
266 | static ssize_t sca3000_show_rev(struct device *dev, | |
267 | struct device_attribute *attr, | |
268 | char *buf) | |
269 | { | |
270 | int len = 0, ret; | |
271 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
272 | struct sca3000_state *st = dev_info->dev_data; | |
273 | ||
574fb258 | 274 | mutex_lock(&st->lock); |
25888dc5 | 275 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1); |
574fb258 JC |
276 | if (ret < 0) |
277 | goto error_ret; | |
278 | len += sprintf(buf + len, | |
279 | "major=%d, minor=%d\n", | |
25888dc5 JC |
280 | st->rx[0] & SCA3000_REVID_MAJOR_MASK, |
281 | st->rx[0] & SCA3000_REVID_MINOR_MASK); | |
574fb258 JC |
282 | error_ret: |
283 | mutex_unlock(&st->lock); | |
284 | ||
285 | return ret ? ret : len; | |
286 | } | |
287 | ||
288 | /** | |
289 | * sca3000_show_available_measurement_modes() display available modes | |
290 | * | |
291 | * This is all read from chip specific data in the driver. Not all | |
292 | * of the sca3000 series support modes other than normal. | |
293 | **/ | |
294 | static ssize_t | |
295 | sca3000_show_available_measurement_modes(struct device *dev, | |
296 | struct device_attribute *attr, | |
297 | char *buf) | |
298 | { | |
299 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
300 | struct sca3000_state *st = dev_info->dev_data; | |
301 | int len = 0; | |
302 | ||
303 | len += sprintf(buf + len, "0 - normal mode"); | |
304 | switch (st->info->option_mode_1) { | |
305 | case SCA3000_OP_MODE_NARROW: | |
306 | len += sprintf(buf + len, ", 1 - narrow mode"); | |
307 | break; | |
308 | case SCA3000_OP_MODE_BYPASS: | |
309 | len += sprintf(buf + len, ", 1 - bypass mode"); | |
310 | break; | |
c608cb01 | 311 | } |
574fb258 JC |
312 | switch (st->info->option_mode_2) { |
313 | case SCA3000_OP_MODE_WIDE: | |
314 | len += sprintf(buf + len, ", 2 - wide mode"); | |
315 | break; | |
316 | } | |
317 | /* always supported */ | |
26de7208 | 318 | len += sprintf(buf + len, " 3 - motion detection\n"); |
574fb258 JC |
319 | |
320 | return len; | |
321 | } | |
322 | ||
323 | /** | |
324 | * sca3000_show_measurmenet_mode() sysfs read of current mode | |
325 | **/ | |
326 | static ssize_t | |
327 | sca3000_show_measurement_mode(struct device *dev, | |
328 | struct device_attribute *attr, | |
329 | char *buf) | |
330 | { | |
331 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
332 | struct sca3000_state *st = dev_info->dev_data; | |
333 | int len = 0, ret; | |
574fb258 JC |
334 | |
335 | mutex_lock(&st->lock); | |
25888dc5 | 336 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
337 | if (ret) |
338 | goto error_ret; | |
339 | /* mask bottom 2 bits - only ones that are relevant */ | |
25888dc5 JC |
340 | st->rx[0] &= 0x03; |
341 | switch (st->rx[0]) { | |
574fb258 JC |
342 | case SCA3000_MEAS_MODE_NORMAL: |
343 | len += sprintf(buf + len, "0 - normal mode\n"); | |
344 | break; | |
345 | case SCA3000_MEAS_MODE_MOT_DET: | |
346 | len += sprintf(buf + len, "3 - motion detection\n"); | |
347 | break; | |
348 | case SCA3000_MEAS_MODE_OP_1: | |
349 | switch (st->info->option_mode_1) { | |
350 | case SCA3000_OP_MODE_NARROW: | |
351 | len += sprintf(buf + len, "1 - narrow mode\n"); | |
352 | break; | |
353 | case SCA3000_OP_MODE_BYPASS: | |
354 | len += sprintf(buf + len, "1 - bypass mode\n"); | |
355 | break; | |
c608cb01 | 356 | } |
574fb258 JC |
357 | break; |
358 | case SCA3000_MEAS_MODE_OP_2: | |
359 | switch (st->info->option_mode_2) { | |
360 | case SCA3000_OP_MODE_WIDE: | |
361 | len += sprintf(buf + len, "2 - wide mode\n"); | |
362 | break; | |
363 | } | |
364 | break; | |
c608cb01 | 365 | } |
574fb258 JC |
366 | |
367 | error_ret: | |
368 | mutex_unlock(&st->lock); | |
369 | ||
370 | return ret ? ret : len; | |
371 | } | |
372 | ||
373 | /** | |
374 | * sca3000_store_measurement_mode() set the current mode | |
375 | **/ | |
376 | static ssize_t | |
377 | sca3000_store_measurement_mode(struct device *dev, | |
378 | struct device_attribute *attr, | |
379 | const char *buf, | |
380 | size_t len) | |
381 | { | |
382 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
383 | struct sca3000_state *st = dev_info->dev_data; | |
384 | int ret; | |
574fb258 JC |
385 | int mask = 0x03; |
386 | long val; | |
387 | ||
388 | mutex_lock(&st->lock); | |
389 | ret = strict_strtol(buf, 10, &val); | |
390 | if (ret) | |
391 | goto error_ret; | |
25888dc5 | 392 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
393 | if (ret) |
394 | goto error_ret; | |
25888dc5 JC |
395 | st->rx[0] &= ~mask; |
396 | st->rx[0] |= (val & mask); | |
397 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]); | |
574fb258 | 398 | if (ret) |
25888dc5 | 399 | goto error_ret; |
574fb258 JC |
400 | mutex_unlock(&st->lock); |
401 | ||
402 | return len; | |
403 | ||
574fb258 JC |
404 | error_ret: |
405 | mutex_unlock(&st->lock); | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
410 | ||
411 | /* Not even vaguely standard attributes so defined here rather than | |
412 | * in the relevant IIO core headers | |
413 | */ | |
f3fb0011 | 414 | static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO, |
574fb258 JC |
415 | sca3000_show_available_measurement_modes, |
416 | NULL, 0); | |
417 | ||
418 | static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR, | |
419 | sca3000_show_measurement_mode, | |
420 | sca3000_store_measurement_mode, | |
421 | 0); | |
422 | ||
423 | /* More standard attributes */ | |
424 | ||
574fb258 JC |
425 | static IIO_DEV_ATTR_REV(sca3000_show_rev); |
426 | ||
25888dc5 JC |
427 | #define SCA3000_INFO_MASK \ |
428 | (1 << IIO_CHAN_INFO_SCALE_SHARED) | |
429 | #define SCA3000_EVENT_MASK \ | |
430 | (IIO_EV_BIT(IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING)) | |
431 | ||
432 | static struct iio_chan_spec sca3000_channels[] = { | |
433 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X, SCA3000_INFO_MASK, | |
aaf370db | 434 | 0, 0, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 435 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y, SCA3000_INFO_MASK, |
aaf370db | 436 | 1, 1, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 437 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Z, SCA3000_INFO_MASK, |
aaf370db | 438 | 2, 2, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 439 | }; |
574fb258 | 440 | |
25888dc5 JC |
441 | static u8 sca3000_addresses[3][3] = { |
442 | [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH, | |
443 | SCA3000_MD_CTRL_OR_X}, | |
444 | [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH, | |
445 | SCA3000_MD_CTRL_OR_Y}, | |
446 | [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH, | |
447 | SCA3000_MD_CTRL_OR_Z}, | |
448 | }; | |
449 | ||
450 | static int sca3000_read_raw(struct iio_dev *indio_dev, | |
451 | struct iio_chan_spec const *chan, | |
452 | int *val, | |
453 | int *val2, | |
454 | long mask) | |
455 | { | |
456 | struct sca3000_state *st = indio_dev->dev_data; | |
457 | int ret; | |
458 | u8 address; | |
459 | ||
460 | switch (mask) { | |
461 | case 0: | |
462 | mutex_lock(&st->lock); | |
463 | if (st->mo_det_use_count) { | |
464 | mutex_unlock(&st->lock); | |
465 | return -EBUSY; | |
466 | } | |
467 | address = sca3000_addresses[chan->address][0]; | |
468 | ret = sca3000_read_data_short(st, address, 2); | |
469 | if (ret < 0) { | |
470 | mutex_unlock(&st->lock); | |
471 | return ret; | |
472 | } | |
473 | *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF; | |
474 | *val = ((*val) << (sizeof(*val)*8 - 13)) >> | |
475 | (sizeof(*val)*8 - 13); | |
476 | mutex_unlock(&st->lock); | |
477 | return IIO_VAL_INT; | |
478 | case (1 << IIO_CHAN_INFO_SCALE_SHARED): | |
479 | *val = 0; | |
480 | if (chan->type == IIO_ACCEL) | |
481 | *val2 = st->info->scale; | |
482 | else /* temperature */ | |
483 | *val2 = 555556; | |
484 | return IIO_VAL_INT_PLUS_MICRO; | |
485 | default: | |
486 | return -EINVAL; | |
487 | } | |
488 | } | |
574fb258 JC |
489 | |
490 | /** | |
491 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
492 | * | |
493 | * The later modes are only relevant to the ring buffer - and depend on current | |
494 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
495 | * division will give good enough answer and not all chips have them specified | |
496 | * at all. | |
497 | **/ | |
498 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
499 | struct device_attribute *attr, | |
500 | char *buf) | |
501 | { | |
502 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
503 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 JC |
504 | int len = 0, ret, val; |
505 | ||
574fb258 | 506 | mutex_lock(&st->lock); |
25888dc5 JC |
507 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
508 | val = st->rx[0]; | |
574fb258 JC |
509 | mutex_unlock(&st->lock); |
510 | if (ret) | |
511 | goto error_ret; | |
25888dc5 JC |
512 | |
513 | switch (val & 0x03) { | |
574fb258 JC |
514 | case SCA3000_MEAS_MODE_NORMAL: |
515 | len += sprintf(buf + len, "%d %d %d\n", | |
516 | st->info->measurement_mode_freq, | |
517 | st->info->measurement_mode_freq/2, | |
518 | st->info->measurement_mode_freq/4); | |
519 | break; | |
520 | case SCA3000_MEAS_MODE_OP_1: | |
521 | len += sprintf(buf + len, "%d %d %d\n", | |
522 | st->info->option_mode_1_freq, | |
523 | st->info->option_mode_1_freq/2, | |
524 | st->info->option_mode_1_freq/4); | |
525 | break; | |
526 | case SCA3000_MEAS_MODE_OP_2: | |
527 | len += sprintf(buf + len, "%d %d %d\n", | |
528 | st->info->option_mode_2_freq, | |
529 | st->info->option_mode_2_freq/2, | |
530 | st->info->option_mode_2_freq/4); | |
531 | break; | |
c608cb01 | 532 | } |
574fb258 JC |
533 | return len; |
534 | error_ret: | |
535 | return ret; | |
536 | } | |
537 | /** | |
538 | * __sca3000_get_base_frequency() obtain mode specific base frequency | |
539 | * | |
540 | * lock must be held | |
541 | **/ | |
542 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
543 | const struct sca3000_chip_info *info, | |
544 | int *base_freq) | |
545 | { | |
546 | int ret; | |
574fb258 | 547 | |
25888dc5 | 548 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
549 | if (ret) |
550 | goto error_ret; | |
25888dc5 | 551 | switch (0x03 & st->rx[0]) { |
574fb258 JC |
552 | case SCA3000_MEAS_MODE_NORMAL: |
553 | *base_freq = info->measurement_mode_freq; | |
554 | break; | |
555 | case SCA3000_MEAS_MODE_OP_1: | |
556 | *base_freq = info->option_mode_1_freq; | |
557 | break; | |
558 | case SCA3000_MEAS_MODE_OP_2: | |
559 | *base_freq = info->option_mode_2_freq; | |
560 | break; | |
c608cb01 | 561 | } |
574fb258 JC |
562 | error_ret: |
563 | return ret; | |
564 | } | |
565 | ||
566 | /** | |
567 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
568 | **/ | |
569 | static ssize_t sca3000_read_frequency(struct device *dev, | |
570 | struct device_attribute *attr, | |
571 | char *buf) | |
572 | { | |
573 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
574 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 JC |
575 | int ret, len = 0, base_freq = 0, val; |
576 | ||
574fb258 JC |
577 | mutex_lock(&st->lock); |
578 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
579 | if (ret) | |
580 | goto error_ret_mut; | |
25888dc5 | 581 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
574fb258 JC |
582 | mutex_unlock(&st->lock); |
583 | if (ret) | |
584 | goto error_ret; | |
25888dc5 | 585 | val = ret; |
574fb258 | 586 | if (base_freq > 0) |
25888dc5 | 587 | switch (val & 0x03) { |
574fb258 JC |
588 | case 0x00: |
589 | case 0x03: | |
590 | len = sprintf(buf, "%d\n", base_freq); | |
591 | break; | |
592 | case 0x01: | |
593 | len = sprintf(buf, "%d\n", base_freq/2); | |
594 | break; | |
595 | case 0x02: | |
596 | len = sprintf(buf, "%d\n", base_freq/4); | |
597 | break; | |
c608cb01 | 598 | } |
25888dc5 | 599 | |
574fb258 JC |
600 | return len; |
601 | error_ret_mut: | |
602 | mutex_unlock(&st->lock); | |
603 | error_ret: | |
604 | return ret; | |
605 | } | |
606 | ||
607 | /** | |
608 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
609 | **/ | |
610 | static ssize_t sca3000_set_frequency(struct device *dev, | |
611 | struct device_attribute *attr, | |
612 | const char *buf, | |
613 | size_t len) | |
614 | { | |
615 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
616 | struct sca3000_state *st = indio_dev->dev_data; | |
617 | int ret, base_freq = 0; | |
25888dc5 | 618 | int ctrlval; |
574fb258 JC |
619 | long val; |
620 | ||
621 | ret = strict_strtol(buf, 10, &val); | |
622 | if (ret) | |
623 | return ret; | |
624 | ||
625 | mutex_lock(&st->lock); | |
626 | /* What mode are we in? */ | |
627 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
628 | if (ret) | |
629 | goto error_free_lock; | |
630 | ||
25888dc5 JC |
631 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
632 | if (ret < 0) | |
574fb258 | 633 | goto error_free_lock; |
25888dc5 | 634 | ctrlval = ret; |
574fb258 | 635 | /* clear the bits */ |
25888dc5 | 636 | ctrlval &= ~0x03; |
574fb258 JC |
637 | |
638 | if (val == base_freq/2) { | |
25888dc5 | 639 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2; |
574fb258 | 640 | } else if (val == base_freq/4) { |
25888dc5 | 641 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4; |
574fb258 JC |
642 | } else if (val != base_freq) { |
643 | ret = -EINVAL; | |
644 | goto error_free_lock; | |
645 | } | |
25888dc5 JC |
646 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, |
647 | ctrlval); | |
574fb258 JC |
648 | error_free_lock: |
649 | mutex_unlock(&st->lock); | |
650 | ||
651 | return ret ? ret : len; | |
652 | } | |
653 | ||
654 | /* Should only really be registered if ring buffer support is compiled in. | |
655 | * Does no harm however and doing it right would add a fair bit of complexity | |
656 | */ | |
f3fb0011 | 657 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq); |
574fb258 JC |
658 | |
659 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
660 | sca3000_read_frequency, | |
661 | sca3000_set_frequency); | |
662 | ||
663 | ||
664 | /** | |
665 | * sca3000_read_temp() sysfs interface to get the temperature when available | |
666 | * | |
667 | * The alignment of data in here is downright odd. See data sheet. | |
668 | * Converting this into a meaningful value is left to inline functions in | |
669 | * userspace part of header. | |
670 | **/ | |
671 | static ssize_t sca3000_read_temp(struct device *dev, | |
672 | struct device_attribute *attr, | |
673 | char *buf) | |
674 | { | |
675 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
676 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 | 677 | int ret; |
574fb258 | 678 | int val; |
25888dc5 | 679 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2); |
574fb258 JC |
680 | if (ret < 0) |
681 | goto error_ret; | |
25888dc5 | 682 | val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5); |
574fb258 | 683 | |
25888dc5 | 684 | return sprintf(buf, "%d\n", val); |
574fb258 JC |
685 | |
686 | error_ret: | |
687 | return ret; | |
688 | } | |
f3fb0011 JC |
689 | static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp); |
690 | ||
51a0a5b0 MS |
691 | static IIO_CONST_ATTR_TEMP_SCALE("0.555556"); |
692 | static IIO_CONST_ATTR_TEMP_OFFSET("-214.6"); | |
574fb258 JC |
693 | |
694 | /** | |
25888dc5 | 695 | * sca3000_read_thresh() - query of a threshold |
574fb258 | 696 | **/ |
25888dc5 JC |
697 | static int sca3000_read_thresh(struct iio_dev *indio_dev, |
698 | int e, | |
699 | int *val) | |
574fb258 | 700 | { |
25888dc5 | 701 | int ret, i; |
574fb258 | 702 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 703 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 704 | mutex_lock(&st->lock); |
25888dc5 | 705 | ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]); |
574fb258 | 706 | mutex_unlock(&st->lock); |
25888dc5 | 707 | if (ret < 0) |
574fb258 | 708 | return ret; |
25888dc5 JC |
709 | *val = 0; |
710 | if (num == 1) | |
711 | for_each_set_bit(i, (unsigned long *)&ret, | |
712 | ARRAY_SIZE(st->info->mot_det_mult_y)) | |
713 | *val += st->info->mot_det_mult_y[i]; | |
714 | else | |
715 | for_each_set_bit(i, (unsigned long *)&ret, | |
716 | ARRAY_SIZE(st->info->mot_det_mult_xz)) | |
717 | *val += st->info->mot_det_mult_xz[i]; | |
574fb258 | 718 | |
25888dc5 | 719 | return 0; |
574fb258 JC |
720 | } |
721 | ||
722 | /** | |
25888dc5 | 723 | * sca3000_write_thresh() control of threshold |
574fb258 | 724 | **/ |
25888dc5 JC |
725 | static int sca3000_write_thresh(struct iio_dev *indio_dev, |
726 | int e, | |
727 | int val) | |
574fb258 | 728 | { |
574fb258 | 729 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 730 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 731 | int ret; |
25888dc5 JC |
732 | int i; |
733 | u8 nonlinear = 0; | |
734 | ||
735 | if (num == 1) { | |
736 | i = ARRAY_SIZE(st->info->mot_det_mult_y); | |
737 | while (i > 0) | |
738 | if (val >= st->info->mot_det_mult_y[--i]) { | |
739 | nonlinear |= (1 << i); | |
740 | val -= st->info->mot_det_mult_y[i]; | |
741 | } | |
742 | } else { | |
743 | i = ARRAY_SIZE(st->info->mot_det_mult_xz); | |
744 | while (i > 0) | |
745 | if (val >= st->info->mot_det_mult_xz[--i]) { | |
746 | nonlinear |= (1 << i); | |
747 | val -= st->info->mot_det_mult_xz[i]; | |
748 | } | |
749 | } | |
574fb258 | 750 | |
574fb258 | 751 | mutex_lock(&st->lock); |
25888dc5 | 752 | ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear); |
574fb258 JC |
753 | mutex_unlock(&st->lock); |
754 | ||
25888dc5 | 755 | return ret; |
574fb258 JC |
756 | } |
757 | ||
574fb258 | 758 | static struct attribute *sca3000_attributes[] = { |
574fb258 | 759 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 760 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 761 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 762 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
763 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
764 | NULL, | |
765 | }; | |
766 | ||
767 | static struct attribute *sca3000_attributes_with_temp[] = { | |
574fb258 | 768 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 769 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 770 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 771 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
772 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
773 | /* Only present if temp sensor is */ | |
f3fb0011 JC |
774 | &iio_dev_attr_temp_raw.dev_attr.attr, |
775 | &iio_const_attr_temp_offset.dev_attr.attr, | |
776 | &iio_const_attr_temp_scale.dev_attr.attr, | |
574fb258 JC |
777 | NULL, |
778 | }; | |
779 | ||
780 | static const struct attribute_group sca3000_attribute_group = { | |
781 | .attrs = sca3000_attributes, | |
782 | }; | |
783 | ||
784 | static const struct attribute_group sca3000_attribute_group_with_temp = { | |
785 | .attrs = sca3000_attributes_with_temp, | |
786 | }; | |
787 | ||
788 | /* RING RELATED interrupt handler */ | |
789 | /* depending on event, push to the ring buffer event chrdev or the event one */ | |
790 | ||
791 | /** | |
25888dc5 | 792 | * sca3000_event_handler() - handling ring and non ring events |
574fb258 JC |
793 | * |
794 | * This function is complicated by the fact that the devices can signify ring | |
795 | * and non ring events via the same interrupt line and they can only | |
796 | * be distinguished via a read of the relevant status register. | |
797 | **/ | |
25888dc5 | 798 | static irqreturn_t sca3000_event_handler(int irq, void *private) |
574fb258 | 799 | { |
25888dc5 JC |
800 | struct iio_dev *indio_dev = private; |
801 | struct sca3000_state *st; | |
802 | int ret, val; | |
803 | s64 last_timestamp = iio_get_time_ns(); | |
574fb258 | 804 | |
25888dc5 | 805 | st = indio_dev->dev_data; |
574fb258 JC |
806 | /* Could lead if badly timed to an extra read of status reg, |
807 | * but ensures no interrupt is missed. | |
808 | */ | |
574fb258 | 809 | mutex_lock(&st->lock); |
25888dc5 JC |
810 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
811 | val = st->rx[0]; | |
574fb258 JC |
812 | mutex_unlock(&st->lock); |
813 | if (ret) | |
814 | goto done; | |
815 | ||
25888dc5 | 816 | sca3000_ring_int_process(val, st->indio_dev->ring); |
574fb258 | 817 | |
25888dc5 | 818 | if (val & SCA3000_INT_STATUS_FREE_FALL) |
574fb258 | 819 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
820 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
821 | 0, | |
822 | IIO_EV_MOD_X_AND_Y_AND_Z, | |
823 | IIO_EV_TYPE_MAG, | |
824 | IIO_EV_DIR_FALLING), | |
25888dc5 | 825 | last_timestamp); |
574fb258 | 826 | |
25888dc5 | 827 | if (val & SCA3000_INT_STATUS_Y_TRIGGER) |
574fb258 | 828 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
829 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
830 | 0, | |
831 | IIO_EV_MOD_Y, | |
832 | IIO_EV_TYPE_MAG, | |
833 | IIO_EV_DIR_RISING), | |
25888dc5 | 834 | last_timestamp); |
574fb258 | 835 | |
25888dc5 | 836 | if (val & SCA3000_INT_STATUS_X_TRIGGER) |
574fb258 | 837 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
838 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
839 | 0, | |
840 | IIO_EV_MOD_X, | |
841 | IIO_EV_TYPE_MAG, | |
842 | IIO_EV_DIR_RISING), | |
25888dc5 | 843 | last_timestamp); |
574fb258 | 844 | |
25888dc5 | 845 | if (val & SCA3000_INT_STATUS_Z_TRIGGER) |
574fb258 | 846 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
847 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
848 | 0, | |
849 | IIO_EV_MOD_Z, | |
850 | IIO_EV_TYPE_MAG, | |
851 | IIO_EV_DIR_RISING), | |
25888dc5 | 852 | last_timestamp); |
574fb258 JC |
853 | |
854 | done: | |
25888dc5 | 855 | return IRQ_HANDLED; |
574fb258 JC |
856 | } |
857 | ||
858 | /** | |
25888dc5 | 859 | * sca3000_read_event_config() what events are enabled |
574fb258 | 860 | **/ |
25888dc5 JC |
861 | static int sca3000_read_event_config(struct iio_dev *indio_dev, |
862 | int e) | |
574fb258 | 863 | { |
574fb258 | 864 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 865 | int ret; |
574fb258 | 866 | u8 protect_mask = 0x03; |
25888dc5 | 867 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
868 | |
869 | /* read current value of mode register */ | |
870 | mutex_lock(&st->lock); | |
25888dc5 | 871 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
872 | if (ret) |
873 | goto error_ret; | |
874 | ||
25888dc5 JC |
875 | if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) |
876 | ret = 0; | |
574fb258 | 877 | else { |
25888dc5 JC |
878 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
879 | if (ret < 0) | |
574fb258 JC |
880 | goto error_ret; |
881 | /* only supporting logical or's for now */ | |
25888dc5 | 882 | ret = !!(ret & sca3000_addresses[num][2]); |
574fb258 | 883 | } |
574fb258 JC |
884 | error_ret: |
885 | mutex_unlock(&st->lock); | |
886 | ||
25888dc5 | 887 | return ret; |
574fb258 JC |
888 | } |
889 | /** | |
890 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
891 | **/ | |
892 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
893 | struct device_attribute *attr, | |
894 | char *buf) | |
895 | { | |
896 | int ret, len; | |
574fb258 JC |
897 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
898 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 | 899 | int val; |
574fb258 JC |
900 | |
901 | mutex_lock(&st->lock); | |
25888dc5 JC |
902 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
903 | val = st->rx[0]; | |
574fb258 | 904 | mutex_unlock(&st->lock); |
25888dc5 | 905 | if (ret < 0) |
574fb258 JC |
906 | return ret; |
907 | len = sprintf(buf, "%d\n", | |
25888dc5 | 908 | !!(val & SCA3000_FREE_FALL_DETECT)); |
574fb258 JC |
909 | return len; |
910 | } | |
574fb258 JC |
911 | |
912 | /** | |
913 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
914 | * | |
915 | * In these chips the free fall detector should send an interrupt if | |
916 | * the device falls more than 25cm. This has not been tested due | |
917 | * to fragile wiring. | |
918 | **/ | |
919 | ||
920 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, | |
921 | struct device_attribute *attr, | |
922 | const char *buf, | |
923 | size_t len) | |
924 | { | |
925 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
926 | struct sca3000_state *st = indio_dev->dev_data; | |
927 | long val; | |
928 | int ret; | |
574fb258 JC |
929 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; |
930 | ||
931 | mutex_lock(&st->lock); | |
932 | ret = strict_strtol(buf, 10, &val); | |
933 | if (ret) | |
934 | goto error_ret; | |
935 | ||
936 | /* read current value of mode register */ | |
25888dc5 | 937 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
938 | if (ret) |
939 | goto error_ret; | |
940 | ||
941 | /*if off and should be on*/ | |
25888dc5 | 942 | if (val && !(st->rx[0] & protect_mask)) |
574fb258 | 943 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 944 | (st->rx[0] | SCA3000_FREE_FALL_DETECT)); |
574fb258 | 945 | /* if on and should be off */ |
25888dc5 | 946 | else if (!val && (st->rx[0] & protect_mask)) |
574fb258 | 947 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 948 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
949 | error_ret: |
950 | mutex_unlock(&st->lock); | |
951 | ||
952 | return ret ? ret : len; | |
953 | } | |
954 | ||
955 | /** | |
956 | * sca3000_set_mo_det() simple on off control for motion detector | |
957 | * | |
958 | * This is a per axis control, but enabling any will result in the | |
959 | * motion detector unit being enabled. | |
960 | * N.B. enabling motion detector stops normal data acquisition. | |
961 | * There is a complexity in knowing which mode to return to when | |
962 | * this mode is disabled. Currently normal mode is assumed. | |
963 | **/ | |
25888dc5 JC |
964 | static int sca3000_write_event_config(struct iio_dev *indio_dev, |
965 | int e, | |
25888dc5 | 966 | int state) |
574fb258 | 967 | { |
574fb258 | 968 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 969 | int ret, ctrlval; |
574fb258 | 970 | u8 protect_mask = 0x03; |
25888dc5 | 971 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
972 | |
973 | mutex_lock(&st->lock); | |
974 | /* First read the motion detector config to find out if | |
975 | * this axis is on*/ | |
25888dc5 JC |
976 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
977 | if (ret < 0) | |
574fb258 | 978 | goto exit_point; |
25888dc5 | 979 | ctrlval = ret; |
574fb258 | 980 | /* Off and should be on */ |
25888dc5 | 981 | if (state && !(ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
982 | ret = sca3000_write_ctrl_reg(st, |
983 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
984 | ctrlval | |
985 | sca3000_addresses[num][2]); | |
574fb258 | 986 | if (ret) |
25888dc5 | 987 | goto exit_point; |
574fb258 | 988 | st->mo_det_use_count++; |
25888dc5 | 989 | } else if (!state && (ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
990 | ret = sca3000_write_ctrl_reg(st, |
991 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
992 | ctrlval & |
993 | ~(sca3000_addresses[num][2])); | |
574fb258 | 994 | if (ret) |
25888dc5 | 995 | goto exit_point; |
574fb258 | 996 | st->mo_det_use_count--; |
25888dc5 JC |
997 | } |
998 | ||
574fb258 | 999 | /* read current value of mode register */ |
25888dc5 | 1000 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1001 | if (ret) |
1002 | goto exit_point; | |
1003 | /*if off and should be on*/ | |
1004 | if ((st->mo_det_use_count) | |
25888dc5 | 1005 | && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1006 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1007 | (st->rx[0] & ~protect_mask) |
574fb258 JC |
1008 | | SCA3000_MEAS_MODE_MOT_DET); |
1009 | /* if on and should be off */ | |
1010 | else if (!(st->mo_det_use_count) | |
25888dc5 | 1011 | && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1012 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1013 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
1014 | exit_point: |
1015 | mutex_unlock(&st->lock); | |
1016 | ||
25888dc5 | 1017 | return ret; |
574fb258 JC |
1018 | } |
1019 | ||
574fb258 | 1020 | /* Free fall detector related event attribute */ |
aaf370db JC |
1021 | static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, |
1022 | accel_x&y&z_mag_falling_en, | |
1023 | S_IRUGO | S_IWUSR, | |
1024 | sca3000_query_free_fall_mode, | |
1025 | sca3000_set_free_fall_mode, | |
1026 | 0); | |
fc5d0e42 | 1027 | |
25888dc5 JC |
1028 | static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period, |
1029 | accel_x&y&z_mag_falling_period, | |
1030 | "0.226"); | |
574fb258 JC |
1031 | |
1032 | static struct attribute *sca3000_event_attributes[] = { | |
aaf370db | 1033 | &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr, |
fc5d0e42 | 1034 | &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr, |
574fb258 JC |
1035 | NULL, |
1036 | }; | |
1037 | ||
1038 | static struct attribute_group sca3000_event_attribute_group = { | |
1039 | .attrs = sca3000_event_attributes, | |
1040 | }; | |
1041 | ||
1042 | /** | |
1043 | * sca3000_clean_setup() get the device into a predictable state | |
1044 | * | |
1045 | * Devices use flash memory to store many of the register values | |
1046 | * and hence can come up in somewhat unpredictable states. | |
1047 | * Hence reset everything on driver load. | |
1048 | **/ | |
1049 | static int sca3000_clean_setup(struct sca3000_state *st) | |
1050 | { | |
1051 | int ret; | |
574fb258 JC |
1052 | |
1053 | mutex_lock(&st->lock); | |
1054 | /* Ensure all interrupts have been acknowledged */ | |
25888dc5 | 1055 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
574fb258 JC |
1056 | if (ret) |
1057 | goto error_ret; | |
574fb258 JC |
1058 | |
1059 | /* Turn off all motion detection channels */ | |
25888dc5 JC |
1060 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
1061 | if (ret < 0) | |
574fb258 | 1062 | goto error_ret; |
25888dc5 JC |
1063 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL, |
1064 | ret & SCA3000_MD_CTRL_PROT_MASK); | |
574fb258 JC |
1065 | if (ret) |
1066 | goto error_ret; | |
1067 | ||
1068 | /* Disable ring buffer */ | |
25888dc5 JC |
1069 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
1070 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1071 | (ret & SCA3000_OUT_CTRL_PROT_MASK) | |
574fb258 JC |
1072 | | SCA3000_OUT_CTRL_BUF_X_EN |
1073 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1074 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1075 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
574fb258 JC |
1076 | if (ret) |
1077 | goto error_ret; | |
1078 | /* Enable interrupts, relevant to mode and set up as active low */ | |
25888dc5 | 1079 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1080 | if (ret) |
1081 | goto error_ret; | |
1082 | ret = sca3000_write_reg(st, | |
1083 | SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 | 1084 | (ret & SCA3000_INT_MASK_PROT_MASK) |
574fb258 | 1085 | | SCA3000_INT_MASK_ACTIVE_LOW); |
574fb258 JC |
1086 | if (ret) |
1087 | goto error_ret; | |
1088 | /* Select normal measurement mode, free fall off, ring off */ | |
1089 | /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1090 | * as that occurs in one of the example on the datasheet */ | |
25888dc5 | 1091 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1092 | if (ret) |
1093 | goto error_ret; | |
25888dc5 JC |
1094 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
1095 | (st->rx[0] & SCA3000_MODE_PROT_MASK)); | |
574fb258 JC |
1096 | st->bpse = 11; |
1097 | ||
1098 | error_ret: | |
1099 | mutex_unlock(&st->lock); | |
1100 | return ret; | |
1101 | } | |
1102 | ||
6fe8135f JC |
1103 | static const struct iio_info sca3000_info = { |
1104 | .attrs = &sca3000_attribute_group, | |
1105 | .read_raw = &sca3000_read_raw, | |
1106 | .num_interrupt_lines = 1, | |
1107 | .event_attrs = &sca3000_event_attribute_group, | |
1108 | .read_event_value = &sca3000_read_thresh, | |
1109 | .write_event_value = &sca3000_write_thresh, | |
1110 | .read_event_config = &sca3000_read_event_config, | |
1111 | .write_event_config = &sca3000_write_event_config, | |
1112 | .driver_module = THIS_MODULE, | |
1113 | }; | |
1114 | ||
1115 | static const struct iio_info sca3000_info_with_temp = { | |
1116 | .attrs = &sca3000_attribute_group_with_temp, | |
1117 | .read_raw = &sca3000_read_raw, | |
1118 | .read_event_value = &sca3000_read_thresh, | |
1119 | .write_event_value = &sca3000_write_thresh, | |
1120 | .read_event_config = &sca3000_read_event_config, | |
1121 | .write_event_config = &sca3000_write_event_config, | |
1122 | .driver_module = THIS_MODULE, | |
1123 | }; | |
1124 | ||
25888dc5 | 1125 | static int __devinit sca3000_probe(struct spi_device *spi) |
574fb258 JC |
1126 | { |
1127 | int ret, regdone = 0; | |
1128 | struct sca3000_state *st; | |
1129 | ||
1130 | st = kzalloc(sizeof(struct sca3000_state), GFP_KERNEL); | |
1131 | if (st == NULL) { | |
1132 | ret = -ENOMEM; | |
1133 | goto error_ret; | |
1134 | } | |
1135 | spi_set_drvdata(spi, st); | |
1136 | ||
574fb258 JC |
1137 | st->us = spi; |
1138 | mutex_init(&st->lock); | |
25888dc5 JC |
1139 | st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi) |
1140 | ->driver_data]; | |
574fb258 | 1141 | |
6f7c8ee5 | 1142 | st->indio_dev = iio_allocate_device(0); |
574fb258 JC |
1143 | if (st->indio_dev == NULL) { |
1144 | ret = -ENOMEM; | |
25888dc5 | 1145 | goto error_clear_st; |
574fb258 | 1146 | } |
574fb258 | 1147 | st->indio_dev->dev.parent = &spi->dev; |
845bd12a | 1148 | st->indio_dev->name = spi_get_device_id(spi)->name; |
574fb258 | 1149 | if (st->info->temp_output) |
6fe8135f | 1150 | st->indio_dev->info = &sca3000_info_with_temp; |
25888dc5 | 1151 | else { |
6fe8135f | 1152 | st->indio_dev->info = &sca3000_info; |
25888dc5 JC |
1153 | st->indio_dev->channels = sca3000_channels; |
1154 | st->indio_dev->num_channels = ARRAY_SIZE(sca3000_channels); | |
1155 | } | |
574fb258 JC |
1156 | st->indio_dev->dev_data = (void *)(st); |
1157 | st->indio_dev->modes = INDIO_DIRECT_MODE; | |
1158 | ||
1159 | sca3000_configure_ring(st->indio_dev); | |
574fb258 JC |
1160 | ret = iio_device_register(st->indio_dev); |
1161 | if (ret < 0) | |
1162 | goto error_free_dev; | |
1163 | regdone = 1; | |
25888dc5 JC |
1164 | ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0, |
1165 | sca3000_channels, | |
1166 | ARRAY_SIZE(sca3000_channels)); | |
574fb258 JC |
1167 | if (ret < 0) |
1168 | goto error_unregister_dev; | |
1169 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) { | |
25888dc5 JC |
1170 | ret = request_threaded_irq(spi->irq, |
1171 | NULL, | |
1172 | &sca3000_event_handler, | |
1173 | IRQF_TRIGGER_FALLING, | |
1174 | "sca3000", | |
1175 | st->indio_dev); | |
574fb258 JC |
1176 | if (ret) |
1177 | goto error_unregister_ring; | |
574fb258 JC |
1178 | } |
1179 | sca3000_register_ring_funcs(st->indio_dev); | |
1180 | ret = sca3000_clean_setup(st); | |
1181 | if (ret) | |
25888dc5 | 1182 | goto error_free_irq; |
574fb258 JC |
1183 | return 0; |
1184 | ||
25888dc5 | 1185 | error_free_irq: |
574fb258 | 1186 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) |
25888dc5 | 1187 | free_irq(spi->irq, st->indio_dev); |
574fb258 JC |
1188 | error_unregister_ring: |
1189 | iio_ring_buffer_unregister(st->indio_dev->ring); | |
1190 | error_unregister_dev: | |
1191 | error_free_dev: | |
1192 | if (regdone) | |
1193 | iio_device_unregister(st->indio_dev); | |
1194 | else | |
1195 | iio_free_device(st->indio_dev); | |
574fb258 JC |
1196 | error_clear_st: |
1197 | kfree(st); | |
1198 | error_ret: | |
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1203 | { | |
1204 | int ret; | |
574fb258 JC |
1205 | |
1206 | mutex_lock(&st->lock); | |
25888dc5 | 1207 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1208 | if (ret) |
1209 | goto error_ret; | |
1210 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 JC |
1211 | (st->rx[0] & |
1212 | ~(SCA3000_INT_MASK_RING_THREE_QUARTER | | |
1213 | SCA3000_INT_MASK_RING_HALF | | |
1214 | SCA3000_INT_MASK_ALL_INTS))); | |
574fb258 | 1215 | error_ret: |
25888dc5 | 1216 | mutex_unlock(&st->lock); |
574fb258 | 1217 | return ret; |
574fb258 JC |
1218 | } |
1219 | ||
1220 | static int sca3000_remove(struct spi_device *spi) | |
1221 | { | |
1222 | struct sca3000_state *st = spi_get_drvdata(spi); | |
1223 | struct iio_dev *indio_dev = st->indio_dev; | |
1224 | int ret; | |
1225 | /* Must ensure no interrupts can be generated after this!*/ | |
1226 | ret = sca3000_stop_all_interrupts(st); | |
1227 | if (ret) | |
1228 | return ret; | |
1229 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) | |
25888dc5 | 1230 | free_irq(spi->irq, indio_dev); |
574fb258 JC |
1231 | iio_ring_buffer_unregister(indio_dev->ring); |
1232 | sca3000_unconfigure_ring(indio_dev); | |
1233 | iio_device_unregister(indio_dev); | |
1234 | ||
574fb258 JC |
1235 | kfree(st); |
1236 | ||
1237 | return 0; | |
1238 | } | |
1239 | ||
25888dc5 JC |
1240 | static const struct spi_device_id sca3000_id[] = { |
1241 | {"sca3000_d01", d01}, | |
1242 | {"sca3000_e02", e02}, | |
1243 | {"sca3000_e04", e04}, | |
1244 | {"sca3000_e05", e05}, | |
1245 | {} | |
1246 | }; | |
574fb258 | 1247 | |
25888dc5 JC |
1248 | static struct spi_driver sca3000_driver = { |
1249 | .driver = { | |
1250 | .name = "sca3000", | |
1251 | .owner = THIS_MODULE, | |
1252 | }, | |
1253 | .probe = sca3000_probe, | |
1254 | .remove = __devexit_p(sca3000_remove), | |
1255 | .id_table = sca3000_id, | |
1256 | }; | |
574fb258 | 1257 | |
574fb258 JC |
1258 | static __init int sca3000_init(void) |
1259 | { | |
25888dc5 | 1260 | return spi_register_driver(&sca3000_driver); |
574fb258 | 1261 | } |
25888dc5 | 1262 | module_init(sca3000_init); |
574fb258 JC |
1263 | |
1264 | static __exit void sca3000_exit(void) | |
1265 | { | |
25888dc5 | 1266 | spi_unregister_driver(&sca3000_driver); |
574fb258 | 1267 | } |
574fb258 JC |
1268 | module_exit(sca3000_exit); |
1269 | ||
1270 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
1271 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); | |
1272 | MODULE_LICENSE("GPL v2"); |