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Commit | Line | Data |
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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 | * | |
0f8c9620 | 8 | * Copyright (c) 2009 Jonathan Cameron <jic23@kernel.org> |
574fb258 JC |
9 | * |
10 | * See industrialio/accels/sca3000.h for comments. | |
11 | */ | |
12 | ||
13 | #include <linux/interrupt.h> | |
574fb258 JC |
14 | #include <linux/fs.h> |
15 | #include <linux/device.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
574fb258 JC |
17 | #include <linux/kernel.h> |
18 | #include <linux/spi/spi.h> | |
19 | #include <linux/sysfs.h> | |
99c97852 | 20 | #include <linux/module.h> |
06458e27 JC |
21 | #include <linux/iio/iio.h> |
22 | #include <linux/iio/sysfs.h> | |
23 | #include <linux/iio/events.h> | |
24 | #include <linux/iio/buffer.h> | |
574fb258 | 25 | |
574fb258 JC |
26 | #include "sca3000.h" |
27 | ||
28 | enum sca3000_variant { | |
29 | d01, | |
574fb258 JC |
30 | e02, |
31 | e04, | |
32 | e05, | |
574fb258 JC |
33 | }; |
34 | ||
5262d8fd PM |
35 | /* |
36 | * Note where option modes are not defined, the chip simply does not | |
574fb258 JC |
37 | * support any. |
38 | * Other chips in the sca3000 series use i2c and are not included here. | |
39 | * | |
40 | * Some of these devices are only listed in the family data sheet and | |
41 | * do not actually appear to be available. | |
42 | */ | |
43 | static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = { | |
845bd12a | 44 | [d01] = { |
25888dc5 | 45 | .scale = 7357, |
574fb258 JC |
46 | .temp_output = true, |
47 | .measurement_mode_freq = 250, | |
48 | .option_mode_1 = SCA3000_OP_MODE_BYPASS, | |
49 | .option_mode_1_freq = 250, | |
25888dc5 JC |
50 | .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300}, |
51 | .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750}, | |
845bd12a JC |
52 | }, |
53 | [e02] = { | |
25888dc5 | 54 | .scale = 9810, |
574fb258 JC |
55 | .measurement_mode_freq = 125, |
56 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
57 | .option_mode_1_freq = 63, | |
25888dc5 JC |
58 | .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050}, |
59 | .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700}, | |
845bd12a JC |
60 | }, |
61 | [e04] = { | |
25888dc5 | 62 | .scale = 19620, |
574fb258 JC |
63 | .measurement_mode_freq = 100, |
64 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
65 | .option_mode_1_freq = 50, | |
66 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
67 | .option_mode_2_freq = 400, | |
25888dc5 JC |
68 | .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100}, |
69 | .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000}, | |
845bd12a JC |
70 | }, |
71 | [e05] = { | |
25888dc5 | 72 | .scale = 61313, |
574fb258 JC |
73 | .measurement_mode_freq = 200, |
74 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
75 | .option_mode_1_freq = 50, | |
76 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
77 | .option_mode_2_freq = 400, | |
25888dc5 JC |
78 | .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900}, |
79 | .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600}, | |
574fb258 JC |
80 | }, |
81 | }; | |
82 | ||
574fb258 JC |
83 | int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val) |
84 | { | |
574fb258 JC |
85 | st->tx[0] = SCA3000_WRITE_REG(address); |
86 | st->tx[1] = val; | |
25888dc5 | 87 | return spi_write(st->us, st->tx, 2); |
574fb258 JC |
88 | } |
89 | ||
25888dc5 | 90 | int sca3000_read_data_short(struct sca3000_state *st, |
89ea25c7 | 91 | u8 reg_address_high, |
25888dc5 | 92 | int len) |
574fb258 | 93 | { |
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 | 103 | st->tx[0] = SCA3000_READ_REG(reg_address_high); |
574fb258 | 104 | |
ad6c46b0 | 105 | return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer)); |
574fb258 | 106 | } |
25888dc5 | 107 | |
574fb258 JC |
108 | /** |
109 | * sca3000_reg_lock_on() test if the ctrl register lock is on | |
110 | * | |
111 | * Lock must be held. | |
112 | **/ | |
113 | static int sca3000_reg_lock_on(struct sca3000_state *st) | |
114 | { | |
574fb258 JC |
115 | int ret; |
116 | ||
25888dc5 | 117 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
118 | if (ret < 0) |
119 | return ret; | |
574fb258 | 120 | |
25888dc5 | 121 | return !(st->rx[0] & SCA3000_LOCKED); |
574fb258 JC |
122 | } |
123 | ||
124 | /** | |
125 | * __sca3000_unlock_reg_lock() unlock the control registers | |
126 | * | |
127 | * Note the device does not appear to support doing this in a single transfer. | |
128 | * This should only ever be used as part of ctrl reg read. | |
129 | * Lock must be held before calling this | |
130 | **/ | |
131 | static int __sca3000_unlock_reg_lock(struct sca3000_state *st) | |
132 | { | |
574fb258 JC |
133 | struct spi_transfer xfer[3] = { |
134 | { | |
574fb258 JC |
135 | .len = 2, |
136 | .cs_change = 1, | |
137 | .tx_buf = st->tx, | |
138 | }, { | |
574fb258 JC |
139 | .len = 2, |
140 | .cs_change = 1, | |
141 | .tx_buf = st->tx + 2, | |
142 | }, { | |
574fb258 | 143 | .len = 2, |
574fb258 JC |
144 | .tx_buf = st->tx + 4, |
145 | }, | |
146 | }; | |
147 | st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
148 | st->tx[1] = 0x00; | |
149 | st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
150 | st->tx[3] = 0x50; | |
151 | st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
152 | st->tx[5] = 0xA0; | |
574fb258 | 153 | |
ad6c46b0 | 154 | return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer)); |
574fb258 JC |
155 | } |
156 | ||
157 | /** | |
158 | * sca3000_write_ctrl_reg() write to a lock protect ctrl register | |
159 | * @sel: selects which registers we wish to write to | |
160 | * @val: the value to be written | |
161 | * | |
162 | * Certain control registers are protected against overwriting by the lock | |
163 | * register and use a shared write address. This function allows writing of | |
164 | * these registers. | |
165 | * Lock must be held. | |
166 | **/ | |
167 | static int sca3000_write_ctrl_reg(struct sca3000_state *st, | |
89ea25c7 | 168 | u8 sel, |
574fb258 JC |
169 | uint8_t val) |
170 | { | |
171 | ||
172 | int ret; | |
173 | ||
174 | ret = sca3000_reg_lock_on(st); | |
175 | if (ret < 0) | |
176 | goto error_ret; | |
177 | if (ret) { | |
178 | ret = __sca3000_unlock_reg_lock(st); | |
179 | if (ret) | |
180 | goto error_ret; | |
181 | } | |
182 | ||
183 | /* Set the control select register */ | |
184 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel); | |
185 | if (ret) | |
186 | goto error_ret; | |
187 | ||
188 | /* Write the actual value into the register */ | |
189 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val); | |
190 | ||
191 | error_ret: | |
192 | return ret; | |
193 | } | |
194 | ||
574fb258 JC |
195 | /** |
196 | * sca3000_read_ctrl_reg() read from lock protected control register. | |
197 | * | |
198 | * Lock must be held. | |
199 | **/ | |
200 | static int sca3000_read_ctrl_reg(struct sca3000_state *st, | |
25888dc5 | 201 | u8 ctrl_reg) |
574fb258 JC |
202 | { |
203 | int ret; | |
204 | ||
205 | ret = sca3000_reg_lock_on(st); | |
206 | if (ret < 0) | |
207 | goto error_ret; | |
208 | if (ret) { | |
209 | ret = __sca3000_unlock_reg_lock(st); | |
210 | if (ret) | |
211 | goto error_ret; | |
212 | } | |
213 | /* Set the control select register */ | |
214 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg); | |
215 | if (ret) | |
216 | goto error_ret; | |
25888dc5 JC |
217 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1); |
218 | if (ret) | |
219 | goto error_ret; | |
220 | else | |
221 | return st->rx[0]; | |
574fb258 JC |
222 | error_ret: |
223 | return ret; | |
224 | } | |
225 | ||
574fb258 | 226 | /** |
e6869759 | 227 | * sca3000_show_rev() - sysfs interface to read the chip revision number |
574fb258 JC |
228 | **/ |
229 | static ssize_t sca3000_show_rev(struct device *dev, | |
230 | struct device_attribute *attr, | |
231 | char *buf) | |
232 | { | |
233 | int len = 0, ret; | |
4b522ce7 | 234 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 235 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 236 | |
574fb258 | 237 | mutex_lock(&st->lock); |
25888dc5 | 238 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1); |
574fb258 JC |
239 | if (ret < 0) |
240 | goto error_ret; | |
241 | len += sprintf(buf + len, | |
242 | "major=%d, minor=%d\n", | |
25888dc5 JC |
243 | st->rx[0] & SCA3000_REVID_MAJOR_MASK, |
244 | st->rx[0] & SCA3000_REVID_MINOR_MASK); | |
574fb258 JC |
245 | error_ret: |
246 | mutex_unlock(&st->lock); | |
247 | ||
248 | return ret ? ret : len; | |
249 | } | |
250 | ||
251 | /** | |
252 | * sca3000_show_available_measurement_modes() display available modes | |
253 | * | |
254 | * This is all read from chip specific data in the driver. Not all | |
255 | * of the sca3000 series support modes other than normal. | |
256 | **/ | |
257 | static ssize_t | |
258 | sca3000_show_available_measurement_modes(struct device *dev, | |
259 | struct device_attribute *attr, | |
260 | char *buf) | |
261 | { | |
4b522ce7 | 262 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 263 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
264 | int len = 0; |
265 | ||
266 | len += sprintf(buf + len, "0 - normal mode"); | |
267 | switch (st->info->option_mode_1) { | |
268 | case SCA3000_OP_MODE_NARROW: | |
269 | len += sprintf(buf + len, ", 1 - narrow mode"); | |
270 | break; | |
271 | case SCA3000_OP_MODE_BYPASS: | |
272 | len += sprintf(buf + len, ", 1 - bypass mode"); | |
273 | break; | |
c608cb01 | 274 | } |
574fb258 JC |
275 | switch (st->info->option_mode_2) { |
276 | case SCA3000_OP_MODE_WIDE: | |
277 | len += sprintf(buf + len, ", 2 - wide mode"); | |
278 | break; | |
279 | } | |
280 | /* always supported */ | |
26de7208 | 281 | len += sprintf(buf + len, " 3 - motion detection\n"); |
574fb258 JC |
282 | |
283 | return len; | |
284 | } | |
285 | ||
286 | /** | |
e6869759 | 287 | * sca3000_show_measurement_mode() sysfs read of current mode |
574fb258 JC |
288 | **/ |
289 | static ssize_t | |
290 | sca3000_show_measurement_mode(struct device *dev, | |
291 | struct device_attribute *attr, | |
292 | char *buf) | |
293 | { | |
4b522ce7 | 294 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 295 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 296 | int len = 0, ret; |
574fb258 JC |
297 | |
298 | mutex_lock(&st->lock); | |
25888dc5 | 299 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
300 | if (ret) |
301 | goto error_ret; | |
302 | /* mask bottom 2 bits - only ones that are relevant */ | |
25888dc5 JC |
303 | st->rx[0] &= 0x03; |
304 | switch (st->rx[0]) { | |
574fb258 JC |
305 | case SCA3000_MEAS_MODE_NORMAL: |
306 | len += sprintf(buf + len, "0 - normal mode\n"); | |
307 | break; | |
308 | case SCA3000_MEAS_MODE_MOT_DET: | |
309 | len += sprintf(buf + len, "3 - motion detection\n"); | |
310 | break; | |
311 | case SCA3000_MEAS_MODE_OP_1: | |
312 | switch (st->info->option_mode_1) { | |
313 | case SCA3000_OP_MODE_NARROW: | |
314 | len += sprintf(buf + len, "1 - narrow mode\n"); | |
315 | break; | |
316 | case SCA3000_OP_MODE_BYPASS: | |
317 | len += sprintf(buf + len, "1 - bypass mode\n"); | |
318 | break; | |
c608cb01 | 319 | } |
574fb258 JC |
320 | break; |
321 | case SCA3000_MEAS_MODE_OP_2: | |
322 | switch (st->info->option_mode_2) { | |
323 | case SCA3000_OP_MODE_WIDE: | |
324 | len += sprintf(buf + len, "2 - wide mode\n"); | |
325 | break; | |
326 | } | |
327 | break; | |
c608cb01 | 328 | } |
574fb258 JC |
329 | |
330 | error_ret: | |
331 | mutex_unlock(&st->lock); | |
332 | ||
333 | return ret ? ret : len; | |
334 | } | |
335 | ||
336 | /** | |
337 | * sca3000_store_measurement_mode() set the current mode | |
338 | **/ | |
339 | static ssize_t | |
340 | sca3000_store_measurement_mode(struct device *dev, | |
341 | struct device_attribute *attr, | |
342 | const char *buf, | |
343 | size_t len) | |
344 | { | |
4b522ce7 | 345 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 346 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 347 | int ret; |
bba42776 | 348 | u8 mask = 0x03; |
3b724ca1 | 349 | u8 val; |
574fb258 JC |
350 | |
351 | mutex_lock(&st->lock); | |
3b724ca1 | 352 | ret = kstrtou8(buf, 10, &val); |
574fb258 JC |
353 | if (ret) |
354 | goto error_ret; | |
d666c0d4 AR |
355 | if (val > 3) { |
356 | ret = -EINVAL; | |
357 | goto error_ret; | |
358 | } | |
25888dc5 | 359 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
360 | if (ret) |
361 | goto error_ret; | |
25888dc5 JC |
362 | st->rx[0] &= ~mask; |
363 | st->rx[0] |= (val & mask); | |
364 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]); | |
574fb258 | 365 | if (ret) |
25888dc5 | 366 | goto error_ret; |
574fb258 JC |
367 | mutex_unlock(&st->lock); |
368 | ||
369 | return len; | |
370 | ||
574fb258 JC |
371 | error_ret: |
372 | mutex_unlock(&st->lock); | |
373 | ||
374 | return ret; | |
375 | } | |
376 | ||
377 | ||
5262d8fd PM |
378 | /* |
379 | * Not even vaguely standard attributes so defined here rather than | |
574fb258 JC |
380 | * in the relevant IIO core headers |
381 | */ | |
f3fb0011 | 382 | static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO, |
574fb258 JC |
383 | sca3000_show_available_measurement_modes, |
384 | NULL, 0); | |
385 | ||
386 | static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR, | |
387 | sca3000_show_measurement_mode, | |
388 | sca3000_store_measurement_mode, | |
389 | 0); | |
390 | ||
391 | /* More standard attributes */ | |
392 | ||
355e25c1 | 393 | static IIO_DEVICE_ATTR(revision, S_IRUGO, sca3000_show_rev, NULL, 0); |
574fb258 | 394 | |
129c3f61 LPC |
395 | static const struct iio_event_spec sca3000_event = { |
396 | .type = IIO_EV_TYPE_MAG, | |
397 | .dir = IIO_EV_DIR_RISING, | |
398 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), | |
399 | }; | |
25888dc5 | 400 | |
691a4ca1 JC |
401 | #define SCA3000_CHAN(index, mod) \ |
402 | { \ | |
403 | .type = IIO_ACCEL, \ | |
404 | .modified = 1, \ | |
405 | .channel2 = mod, \ | |
a8b21c5c JC |
406 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
407 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\ | |
691a4ca1 JC |
408 | .address = index, \ |
409 | .scan_index = index, \ | |
410 | .scan_type = { \ | |
411 | .sign = 's', \ | |
412 | .realbits = 11, \ | |
413 | .storagebits = 16, \ | |
414 | .shift = 5, \ | |
415 | }, \ | |
129c3f61 LPC |
416 | .event_spec = &sca3000_event, \ |
417 | .num_event_specs = 1, \ | |
691a4ca1 JC |
418 | } |
419 | ||
f4e4b955 | 420 | static const struct iio_chan_spec sca3000_channels[] = { |
691a4ca1 JC |
421 | SCA3000_CHAN(0, IIO_MOD_X), |
422 | SCA3000_CHAN(1, IIO_MOD_Y), | |
423 | SCA3000_CHAN(2, IIO_MOD_Z), | |
25888dc5 | 424 | }; |
574fb258 | 425 | |
bb0090e9 PM |
426 | static const struct iio_chan_spec sca3000_channels_with_temp[] = { |
427 | SCA3000_CHAN(0, IIO_MOD_X), | |
428 | SCA3000_CHAN(1, IIO_MOD_Y), | |
429 | SCA3000_CHAN(2, IIO_MOD_Z), | |
430 | { | |
431 | .type = IIO_TEMP, | |
432 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), | |
433 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | | |
434 | BIT(IIO_CHAN_INFO_OFFSET), | |
131e97d3 LPC |
435 | /* No buffer support */ |
436 | .scan_index = -1, | |
bb0090e9 PM |
437 | }, |
438 | }; | |
439 | ||
25888dc5 JC |
440 | static u8 sca3000_addresses[3][3] = { |
441 | [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH, | |
442 | SCA3000_MD_CTRL_OR_X}, | |
443 | [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH, | |
444 | SCA3000_MD_CTRL_OR_Y}, | |
445 | [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH, | |
446 | SCA3000_MD_CTRL_OR_Z}, | |
447 | }; | |
448 | ||
449 | static int sca3000_read_raw(struct iio_dev *indio_dev, | |
450 | struct iio_chan_spec const *chan, | |
451 | int *val, | |
452 | int *val2, | |
453 | long mask) | |
454 | { | |
83f0422d | 455 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
456 | int ret; |
457 | u8 address; | |
458 | ||
459 | switch (mask) { | |
31313fc6 | 460 | case IIO_CHAN_INFO_RAW: |
25888dc5 | 461 | mutex_lock(&st->lock); |
bb0090e9 PM |
462 | if (chan->type == IIO_ACCEL) { |
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; | |
1abe0c9a IC |
474 | *val = ((*val) << (sizeof(*val) * 8 - 13)) >> |
475 | (sizeof(*val) * 8 - 13); | |
bb0090e9 PM |
476 | } else { |
477 | /* get the temperature when available */ | |
478 | ret = sca3000_read_data_short(st, | |
252b1d84 IC |
479 | SCA3000_REG_ADDR_TEMP_MSB, |
480 | 2); | |
bb0090e9 PM |
481 | if (ret < 0) { |
482 | mutex_unlock(&st->lock); | |
483 | return ret; | |
484 | } | |
2f29c168 MOA |
485 | *val = ((st->rx[0] & 0x3F) << 3) | |
486 | ((st->rx[1] & 0xE0) >> 5); | |
25888dc5 | 487 | } |
25888dc5 JC |
488 | mutex_unlock(&st->lock); |
489 | return IIO_VAL_INT; | |
c8a9f805 | 490 | case IIO_CHAN_INFO_SCALE: |
25888dc5 JC |
491 | *val = 0; |
492 | if (chan->type == IIO_ACCEL) | |
493 | *val2 = st->info->scale; | |
494 | else /* temperature */ | |
495 | *val2 = 555556; | |
496 | return IIO_VAL_INT_PLUS_MICRO; | |
bb0090e9 PM |
497 | case IIO_CHAN_INFO_OFFSET: |
498 | *val = -214; | |
499 | *val2 = 600000; | |
500 | return IIO_VAL_INT_PLUS_MICRO; | |
25888dc5 JC |
501 | default: |
502 | return -EINVAL; | |
503 | } | |
504 | } | |
574fb258 JC |
505 | |
506 | /** | |
507 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
508 | * | |
509 | * The later modes are only relevant to the ring buffer - and depend on current | |
510 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
511 | * division will give good enough answer and not all chips have them specified | |
512 | * at all. | |
513 | **/ | |
514 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
252b1d84 IC |
515 | struct device_attribute *attr, |
516 | char *buf) | |
574fb258 | 517 | { |
4b522ce7 | 518 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 519 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
520 | int len = 0, ret, val; |
521 | ||
574fb258 | 522 | mutex_lock(&st->lock); |
25888dc5 JC |
523 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
524 | val = st->rx[0]; | |
574fb258 JC |
525 | mutex_unlock(&st->lock); |
526 | if (ret) | |
527 | goto error_ret; | |
25888dc5 JC |
528 | |
529 | switch (val & 0x03) { | |
574fb258 JC |
530 | case SCA3000_MEAS_MODE_NORMAL: |
531 | len += sprintf(buf + len, "%d %d %d\n", | |
532 | st->info->measurement_mode_freq, | |
1abe0c9a IC |
533 | st->info->measurement_mode_freq / 2, |
534 | st->info->measurement_mode_freq / 4); | |
574fb258 JC |
535 | break; |
536 | case SCA3000_MEAS_MODE_OP_1: | |
537 | len += sprintf(buf + len, "%d %d %d\n", | |
538 | st->info->option_mode_1_freq, | |
1abe0c9a IC |
539 | st->info->option_mode_1_freq / 2, |
540 | st->info->option_mode_1_freq / 4); | |
574fb258 JC |
541 | break; |
542 | case SCA3000_MEAS_MODE_OP_2: | |
543 | len += sprintf(buf + len, "%d %d %d\n", | |
544 | st->info->option_mode_2_freq, | |
1abe0c9a IC |
545 | st->info->option_mode_2_freq / 2, |
546 | st->info->option_mode_2_freq / 4); | |
574fb258 | 547 | break; |
c608cb01 | 548 | } |
574fb258 JC |
549 | return len; |
550 | error_ret: | |
551 | return ret; | |
552 | } | |
553 | /** | |
e6869759 | 554 | * __sca3000_get_base_freq() obtain mode specific base frequency |
574fb258 JC |
555 | * |
556 | * lock must be held | |
557 | **/ | |
558 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
559 | const struct sca3000_chip_info *info, | |
560 | int *base_freq) | |
561 | { | |
562 | int ret; | |
574fb258 | 563 | |
25888dc5 | 564 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
565 | if (ret) |
566 | goto error_ret; | |
25888dc5 | 567 | switch (0x03 & st->rx[0]) { |
574fb258 JC |
568 | case SCA3000_MEAS_MODE_NORMAL: |
569 | *base_freq = info->measurement_mode_freq; | |
570 | break; | |
571 | case SCA3000_MEAS_MODE_OP_1: | |
572 | *base_freq = info->option_mode_1_freq; | |
573 | break; | |
574 | case SCA3000_MEAS_MODE_OP_2: | |
575 | *base_freq = info->option_mode_2_freq; | |
576 | break; | |
c608cb01 | 577 | } |
574fb258 JC |
578 | error_ret: |
579 | return ret; | |
580 | } | |
581 | ||
582 | /** | |
583 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
584 | **/ | |
585 | static ssize_t sca3000_read_frequency(struct device *dev, | |
252b1d84 IC |
586 | struct device_attribute *attr, |
587 | char *buf) | |
574fb258 | 588 | { |
4b522ce7 | 589 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 590 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
591 | int ret, len = 0, base_freq = 0, val; |
592 | ||
574fb258 JC |
593 | mutex_lock(&st->lock); |
594 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
595 | if (ret) | |
596 | goto error_ret_mut; | |
25888dc5 | 597 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
574fb258 JC |
598 | mutex_unlock(&st->lock); |
599 | if (ret) | |
600 | goto error_ret; | |
25888dc5 | 601 | val = ret; |
574fb258 | 602 | if (base_freq > 0) |
25888dc5 | 603 | switch (val & 0x03) { |
574fb258 JC |
604 | case 0x00: |
605 | case 0x03: | |
606 | len = sprintf(buf, "%d\n", base_freq); | |
607 | break; | |
608 | case 0x01: | |
1abe0c9a | 609 | len = sprintf(buf, "%d\n", base_freq / 2); |
574fb258 JC |
610 | break; |
611 | case 0x02: | |
1abe0c9a | 612 | len = sprintf(buf, "%d\n", base_freq / 4); |
574fb258 | 613 | break; |
c608cb01 | 614 | } |
25888dc5 | 615 | |
574fb258 JC |
616 | return len; |
617 | error_ret_mut: | |
618 | mutex_unlock(&st->lock); | |
619 | error_ret: | |
620 | return ret; | |
621 | } | |
622 | ||
623 | /** | |
624 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
625 | **/ | |
626 | static ssize_t sca3000_set_frequency(struct device *dev, | |
252b1d84 IC |
627 | struct device_attribute *attr, |
628 | const char *buf, | |
629 | size_t len) | |
574fb258 | 630 | { |
4b522ce7 | 631 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 632 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 633 | int ret, base_freq = 0; |
25888dc5 | 634 | int ctrlval; |
e5e26dd5 | 635 | int val; |
574fb258 | 636 | |
e5e26dd5 | 637 | ret = kstrtoint(buf, 10, &val); |
574fb258 JC |
638 | if (ret) |
639 | return ret; | |
640 | ||
641 | mutex_lock(&st->lock); | |
642 | /* What mode are we in? */ | |
643 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
644 | if (ret) | |
645 | goto error_free_lock; | |
646 | ||
25888dc5 JC |
647 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
648 | if (ret < 0) | |
574fb258 | 649 | goto error_free_lock; |
25888dc5 | 650 | ctrlval = ret; |
574fb258 | 651 | /* clear the bits */ |
25888dc5 | 652 | ctrlval &= ~0x03; |
574fb258 | 653 | |
1abe0c9a | 654 | if (val == base_freq / 2) { |
25888dc5 | 655 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2; |
1abe0c9a | 656 | } else if (val == base_freq / 4) { |
25888dc5 | 657 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4; |
574fb258 JC |
658 | } else if (val != base_freq) { |
659 | ret = -EINVAL; | |
660 | goto error_free_lock; | |
661 | } | |
25888dc5 JC |
662 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, |
663 | ctrlval); | |
574fb258 JC |
664 | error_free_lock: |
665 | mutex_unlock(&st->lock); | |
666 | ||
667 | return ret ? ret : len; | |
668 | } | |
669 | ||
5262d8fd PM |
670 | /* |
671 | * Should only really be registered if ring buffer support is compiled in. | |
574fb258 JC |
672 | * Does no harm however and doing it right would add a fair bit of complexity |
673 | */ | |
f3fb0011 | 674 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq); |
574fb258 JC |
675 | |
676 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
677 | sca3000_read_frequency, | |
678 | sca3000_set_frequency); | |
679 | ||
574fb258 | 680 | /** |
25888dc5 | 681 | * sca3000_read_thresh() - query of a threshold |
574fb258 | 682 | **/ |
25888dc5 | 683 | static int sca3000_read_thresh(struct iio_dev *indio_dev, |
129c3f61 LPC |
684 | const struct iio_chan_spec *chan, |
685 | enum iio_event_type type, | |
686 | enum iio_event_direction dir, | |
687 | enum iio_event_info info, | |
688 | int *val, int *val2) | |
574fb258 | 689 | { |
25888dc5 | 690 | int ret, i; |
83f0422d | 691 | struct sca3000_state *st = iio_priv(indio_dev); |
129c3f61 | 692 | int num = chan->channel2; |
d7b79519 | 693 | |
574fb258 | 694 | mutex_lock(&st->lock); |
25888dc5 | 695 | ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]); |
574fb258 | 696 | mutex_unlock(&st->lock); |
25888dc5 | 697 | if (ret < 0) |
574fb258 | 698 | return ret; |
25888dc5 JC |
699 | *val = 0; |
700 | if (num == 1) | |
701 | for_each_set_bit(i, (unsigned long *)&ret, | |
702 | ARRAY_SIZE(st->info->mot_det_mult_y)) | |
703 | *val += st->info->mot_det_mult_y[i]; | |
704 | else | |
705 | for_each_set_bit(i, (unsigned long *)&ret, | |
706 | ARRAY_SIZE(st->info->mot_det_mult_xz)) | |
707 | *val += st->info->mot_det_mult_xz[i]; | |
574fb258 | 708 | |
129c3f61 | 709 | return IIO_VAL_INT; |
574fb258 JC |
710 | } |
711 | ||
712 | /** | |
25888dc5 | 713 | * sca3000_write_thresh() control of threshold |
574fb258 | 714 | **/ |
25888dc5 | 715 | static int sca3000_write_thresh(struct iio_dev *indio_dev, |
129c3f61 LPC |
716 | const struct iio_chan_spec *chan, |
717 | enum iio_event_type type, | |
718 | enum iio_event_direction dir, | |
719 | enum iio_event_info info, | |
720 | int val, int val2) | |
574fb258 | 721 | { |
83f0422d | 722 | struct sca3000_state *st = iio_priv(indio_dev); |
129c3f61 | 723 | int num = chan->channel2; |
574fb258 | 724 | int ret; |
25888dc5 JC |
725 | int i; |
726 | u8 nonlinear = 0; | |
727 | ||
728 | if (num == 1) { | |
729 | i = ARRAY_SIZE(st->info->mot_det_mult_y); | |
730 | while (i > 0) | |
731 | if (val >= st->info->mot_det_mult_y[--i]) { | |
732 | nonlinear |= (1 << i); | |
733 | val -= st->info->mot_det_mult_y[i]; | |
734 | } | |
735 | } else { | |
736 | i = ARRAY_SIZE(st->info->mot_det_mult_xz); | |
737 | while (i > 0) | |
738 | if (val >= st->info->mot_det_mult_xz[--i]) { | |
739 | nonlinear |= (1 << i); | |
740 | val -= st->info->mot_det_mult_xz[i]; | |
741 | } | |
742 | } | |
574fb258 | 743 | |
574fb258 | 744 | mutex_lock(&st->lock); |
25888dc5 | 745 | ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear); |
574fb258 JC |
746 | mutex_unlock(&st->lock); |
747 | ||
25888dc5 | 748 | return ret; |
574fb258 JC |
749 | } |
750 | ||
574fb258 | 751 | static struct attribute *sca3000_attributes[] = { |
574fb258 | 752 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 753 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 754 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 755 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
756 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
757 | NULL, | |
758 | }; | |
759 | ||
574fb258 JC |
760 | static const struct attribute_group sca3000_attribute_group = { |
761 | .attrs = sca3000_attributes, | |
762 | }; | |
763 | ||
574fb258 | 764 | /** |
25888dc5 | 765 | * sca3000_event_handler() - handling ring and non ring events |
574fb258 | 766 | * |
5262d8fd PM |
767 | * Ring related interrupt handler. Depending on event, push to |
768 | * the ring buffer event chrdev or the event one. | |
769 | * | |
574fb258 JC |
770 | * This function is complicated by the fact that the devices can signify ring |
771 | * and non ring events via the same interrupt line and they can only | |
772 | * be distinguished via a read of the relevant status register. | |
773 | **/ | |
25888dc5 | 774 | static irqreturn_t sca3000_event_handler(int irq, void *private) |
574fb258 | 775 | { |
25888dc5 | 776 | struct iio_dev *indio_dev = private; |
83f0422d | 777 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
778 | int ret, val; |
779 | s64 last_timestamp = iio_get_time_ns(); | |
574fb258 | 780 | |
5262d8fd PM |
781 | /* |
782 | * Could lead if badly timed to an extra read of status reg, | |
574fb258 JC |
783 | * but ensures no interrupt is missed. |
784 | */ | |
574fb258 | 785 | mutex_lock(&st->lock); |
25888dc5 JC |
786 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
787 | val = st->rx[0]; | |
574fb258 JC |
788 | mutex_unlock(&st->lock); |
789 | if (ret) | |
790 | goto done; | |
791 | ||
14555b14 | 792 | sca3000_ring_int_process(val, indio_dev->buffer); |
574fb258 | 793 | |
25888dc5 | 794 | if (val & SCA3000_INT_STATUS_FREE_FALL) |
5aa96188 | 795 | iio_push_event(indio_dev, |
c4b14d99 | 796 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 797 | 0, |
c4b14d99 | 798 | IIO_MOD_X_AND_Y_AND_Z, |
de9fe32a JC |
799 | IIO_EV_TYPE_MAG, |
800 | IIO_EV_DIR_FALLING), | |
25888dc5 | 801 | last_timestamp); |
574fb258 | 802 | |
25888dc5 | 803 | if (val & SCA3000_INT_STATUS_Y_TRIGGER) |
5aa96188 | 804 | iio_push_event(indio_dev, |
c4b14d99 | 805 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 806 | 0, |
c4b14d99 | 807 | IIO_MOD_Y, |
de9fe32a JC |
808 | IIO_EV_TYPE_MAG, |
809 | IIO_EV_DIR_RISING), | |
25888dc5 | 810 | last_timestamp); |
574fb258 | 811 | |
25888dc5 | 812 | if (val & SCA3000_INT_STATUS_X_TRIGGER) |
5aa96188 | 813 | iio_push_event(indio_dev, |
c4b14d99 | 814 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 815 | 0, |
c4b14d99 | 816 | IIO_MOD_X, |
de9fe32a JC |
817 | IIO_EV_TYPE_MAG, |
818 | IIO_EV_DIR_RISING), | |
25888dc5 | 819 | last_timestamp); |
574fb258 | 820 | |
25888dc5 | 821 | if (val & SCA3000_INT_STATUS_Z_TRIGGER) |
5aa96188 | 822 | iio_push_event(indio_dev, |
c4b14d99 | 823 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 824 | 0, |
c4b14d99 | 825 | IIO_MOD_Z, |
de9fe32a JC |
826 | IIO_EV_TYPE_MAG, |
827 | IIO_EV_DIR_RISING), | |
25888dc5 | 828 | last_timestamp); |
574fb258 JC |
829 | |
830 | done: | |
25888dc5 | 831 | return IRQ_HANDLED; |
574fb258 JC |
832 | } |
833 | ||
834 | /** | |
25888dc5 | 835 | * sca3000_read_event_config() what events are enabled |
574fb258 | 836 | **/ |
25888dc5 | 837 | static int sca3000_read_event_config(struct iio_dev *indio_dev, |
129c3f61 LPC |
838 | const struct iio_chan_spec *chan, |
839 | enum iio_event_type type, | |
840 | enum iio_event_direction dir) | |
574fb258 | 841 | { |
83f0422d | 842 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 843 | int ret; |
574fb258 | 844 | u8 protect_mask = 0x03; |
129c3f61 | 845 | int num = chan->channel2; |
574fb258 JC |
846 | |
847 | /* read current value of mode register */ | |
848 | mutex_lock(&st->lock); | |
25888dc5 | 849 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
850 | if (ret) |
851 | goto error_ret; | |
852 | ||
25888dc5 JC |
853 | if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) |
854 | ret = 0; | |
574fb258 | 855 | else { |
25888dc5 JC |
856 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
857 | if (ret < 0) | |
574fb258 JC |
858 | goto error_ret; |
859 | /* only supporting logical or's for now */ | |
25888dc5 | 860 | ret = !!(ret & sca3000_addresses[num][2]); |
574fb258 | 861 | } |
574fb258 JC |
862 | error_ret: |
863 | mutex_unlock(&st->lock); | |
864 | ||
25888dc5 | 865 | return ret; |
574fb258 JC |
866 | } |
867 | /** | |
868 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
869 | **/ | |
870 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
871 | struct device_attribute *attr, | |
872 | char *buf) | |
873 | { | |
3194e14d | 874 | int ret; |
4b522ce7 | 875 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 876 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 877 | int val; |
574fb258 JC |
878 | |
879 | mutex_lock(&st->lock); | |
25888dc5 JC |
880 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
881 | val = st->rx[0]; | |
574fb258 | 882 | mutex_unlock(&st->lock); |
25888dc5 | 883 | if (ret < 0) |
574fb258 | 884 | return ret; |
3194e14d | 885 | return sprintf(buf, "%d\n", !!(val & SCA3000_FREE_FALL_DETECT)); |
574fb258 | 886 | } |
574fb258 JC |
887 | |
888 | /** | |
889 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
890 | * | |
891 | * In these chips the free fall detector should send an interrupt if | |
892 | * the device falls more than 25cm. This has not been tested due | |
893 | * to fragile wiring. | |
894 | **/ | |
574fb258 JC |
895 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, |
896 | struct device_attribute *attr, | |
897 | const char *buf, | |
898 | size_t len) | |
899 | { | |
4b522ce7 | 900 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 901 | struct sca3000_state *st = iio_priv(indio_dev); |
e5e26dd5 | 902 | u8 val; |
574fb258 | 903 | int ret; |
574fb258 JC |
904 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; |
905 | ||
906 | mutex_lock(&st->lock); | |
e5e26dd5 | 907 | ret = kstrtou8(buf, 10, &val); |
574fb258 JC |
908 | if (ret) |
909 | goto error_ret; | |
910 | ||
911 | /* read current value of mode register */ | |
25888dc5 | 912 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
913 | if (ret) |
914 | goto error_ret; | |
915 | ||
5262d8fd | 916 | /* if off and should be on */ |
25888dc5 | 917 | if (val && !(st->rx[0] & protect_mask)) |
574fb258 | 918 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 919 | (st->rx[0] | SCA3000_FREE_FALL_DETECT)); |
574fb258 | 920 | /* if on and should be off */ |
25888dc5 | 921 | else if (!val && (st->rx[0] & protect_mask)) |
574fb258 | 922 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 923 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
924 | error_ret: |
925 | mutex_unlock(&st->lock); | |
926 | ||
927 | return ret ? ret : len; | |
928 | } | |
929 | ||
930 | /** | |
e6869759 | 931 | * sca3000_write_event_config() simple on off control for motion detector |
574fb258 JC |
932 | * |
933 | * This is a per axis control, but enabling any will result in the | |
934 | * motion detector unit being enabled. | |
935 | * N.B. enabling motion detector stops normal data acquisition. | |
936 | * There is a complexity in knowing which mode to return to when | |
937 | * this mode is disabled. Currently normal mode is assumed. | |
938 | **/ | |
25888dc5 | 939 | static int sca3000_write_event_config(struct iio_dev *indio_dev, |
129c3f61 LPC |
940 | const struct iio_chan_spec *chan, |
941 | enum iio_event_type type, | |
942 | enum iio_event_direction dir, | |
25888dc5 | 943 | int state) |
574fb258 | 944 | { |
83f0422d | 945 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 946 | int ret, ctrlval; |
574fb258 | 947 | u8 protect_mask = 0x03; |
129c3f61 | 948 | int num = chan->channel2; |
574fb258 JC |
949 | |
950 | mutex_lock(&st->lock); | |
5262d8fd PM |
951 | /* |
952 | * First read the motion detector config to find out if | |
953 | * this axis is on | |
954 | */ | |
25888dc5 JC |
955 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
956 | if (ret < 0) | |
574fb258 | 957 | goto exit_point; |
25888dc5 | 958 | ctrlval = ret; |
5262d8fd | 959 | /* if off and should be on */ |
25888dc5 | 960 | if (state && !(ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
961 | ret = sca3000_write_ctrl_reg(st, |
962 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
963 | ctrlval | |
964 | sca3000_addresses[num][2]); | |
574fb258 | 965 | if (ret) |
25888dc5 | 966 | goto exit_point; |
574fb258 | 967 | st->mo_det_use_count++; |
25888dc5 | 968 | } else if (!state && (ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
969 | ret = sca3000_write_ctrl_reg(st, |
970 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
971 | ctrlval & |
972 | ~(sca3000_addresses[num][2])); | |
574fb258 | 973 | if (ret) |
25888dc5 | 974 | goto exit_point; |
574fb258 | 975 | st->mo_det_use_count--; |
25888dc5 JC |
976 | } |
977 | ||
574fb258 | 978 | /* read current value of mode register */ |
25888dc5 | 979 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
980 | if (ret) |
981 | goto exit_point; | |
5262d8fd | 982 | /* if off and should be on */ |
574fb258 | 983 | if ((st->mo_det_use_count) |
25888dc5 | 984 | && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 985 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 986 | (st->rx[0] & ~protect_mask) |
574fb258 JC |
987 | | SCA3000_MEAS_MODE_MOT_DET); |
988 | /* if on and should be off */ | |
989 | else if (!(st->mo_det_use_count) | |
25888dc5 | 990 | && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 991 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 992 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
993 | exit_point: |
994 | mutex_unlock(&st->lock); | |
995 | ||
25888dc5 | 996 | return ret; |
574fb258 JC |
997 | } |
998 | ||
574fb258 | 999 | /* Free fall detector related event attribute */ |
aaf370db | 1000 | static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, |
1abe0c9a | 1001 | in_accel_x & y & z_mag_falling_en, |
aaf370db JC |
1002 | S_IRUGO | S_IWUSR, |
1003 | sca3000_query_free_fall_mode, | |
1004 | sca3000_set_free_fall_mode, | |
1005 | 0); | |
fc5d0e42 | 1006 | |
25888dc5 | 1007 | static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period, |
1abe0c9a | 1008 | in_accel_x & y & z_mag_falling_period, |
25888dc5 | 1009 | "0.226"); |
574fb258 JC |
1010 | |
1011 | static struct attribute *sca3000_event_attributes[] = { | |
aaf370db | 1012 | &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr, |
fc5d0e42 | 1013 | &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr, |
574fb258 JC |
1014 | NULL, |
1015 | }; | |
1016 | ||
1017 | static struct attribute_group sca3000_event_attribute_group = { | |
1018 | .attrs = sca3000_event_attributes, | |
8e7d9672 | 1019 | .name = "events", |
574fb258 JC |
1020 | }; |
1021 | ||
1022 | /** | |
1023 | * sca3000_clean_setup() get the device into a predictable state | |
1024 | * | |
1025 | * Devices use flash memory to store many of the register values | |
1026 | * and hence can come up in somewhat unpredictable states. | |
1027 | * Hence reset everything on driver load. | |
5262d8fd | 1028 | **/ |
574fb258 JC |
1029 | static int sca3000_clean_setup(struct sca3000_state *st) |
1030 | { | |
1031 | int ret; | |
574fb258 JC |
1032 | |
1033 | mutex_lock(&st->lock); | |
1034 | /* Ensure all interrupts have been acknowledged */ | |
25888dc5 | 1035 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
574fb258 JC |
1036 | if (ret) |
1037 | goto error_ret; | |
574fb258 JC |
1038 | |
1039 | /* Turn off all motion detection channels */ | |
25888dc5 JC |
1040 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
1041 | if (ret < 0) | |
574fb258 | 1042 | goto error_ret; |
25888dc5 JC |
1043 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL, |
1044 | ret & SCA3000_MD_CTRL_PROT_MASK); | |
574fb258 JC |
1045 | if (ret) |
1046 | goto error_ret; | |
1047 | ||
1048 | /* Disable ring buffer */ | |
25888dc5 JC |
1049 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
1050 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1051 | (ret & SCA3000_OUT_CTRL_PROT_MASK) | |
574fb258 JC |
1052 | | SCA3000_OUT_CTRL_BUF_X_EN |
1053 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1054 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1055 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
574fb258 JC |
1056 | if (ret) |
1057 | goto error_ret; | |
1058 | /* Enable interrupts, relevant to mode and set up as active low */ | |
25888dc5 | 1059 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1060 | if (ret) |
1061 | goto error_ret; | |
1062 | ret = sca3000_write_reg(st, | |
1063 | SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 | 1064 | (ret & SCA3000_INT_MASK_PROT_MASK) |
574fb258 | 1065 | | SCA3000_INT_MASK_ACTIVE_LOW); |
574fb258 JC |
1066 | if (ret) |
1067 | goto error_ret; | |
5262d8fd PM |
1068 | /* |
1069 | * Select normal measurement mode, free fall off, ring off | |
1070 | * Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1071 | * as that occurs in one of the example on the datasheet | |
1072 | */ | |
25888dc5 | 1073 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1074 | if (ret) |
1075 | goto error_ret; | |
25888dc5 JC |
1076 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
1077 | (st->rx[0] & SCA3000_MODE_PROT_MASK)); | |
574fb258 JC |
1078 | st->bpse = 11; |
1079 | ||
1080 | error_ret: | |
1081 | mutex_unlock(&st->lock); | |
1082 | return ret; | |
1083 | } | |
1084 | ||
6fe8135f JC |
1085 | static const struct iio_info sca3000_info = { |
1086 | .attrs = &sca3000_attribute_group, | |
1087 | .read_raw = &sca3000_read_raw, | |
6fe8135f | 1088 | .event_attrs = &sca3000_event_attribute_group, |
cb955852 LPC |
1089 | .read_event_value = &sca3000_read_thresh, |
1090 | .write_event_value = &sca3000_write_thresh, | |
1091 | .read_event_config = &sca3000_read_event_config, | |
1092 | .write_event_config = &sca3000_write_event_config, | |
6fe8135f JC |
1093 | .driver_module = THIS_MODULE, |
1094 | }; | |
1095 | ||
4ae1c61f | 1096 | static int sca3000_probe(struct spi_device *spi) |
574fb258 | 1097 | { |
d2fffd6c | 1098 | int ret; |
574fb258 | 1099 | struct sca3000_state *st; |
83f0422d | 1100 | struct iio_dev *indio_dev; |
574fb258 | 1101 | |
0189d93f SK |
1102 | indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
1103 | if (!indio_dev) | |
1104 | return -ENOMEM; | |
574fb258 | 1105 | |
03bda05d | 1106 | st = iio_priv(indio_dev); |
83f0422d | 1107 | spi_set_drvdata(spi, indio_dev); |
574fb258 JC |
1108 | st->us = spi; |
1109 | mutex_init(&st->lock); | |
25888dc5 JC |
1110 | st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi) |
1111 | ->driver_data]; | |
574fb258 | 1112 | |
83f0422d JC |
1113 | indio_dev->dev.parent = &spi->dev; |
1114 | indio_dev->name = spi_get_device_id(spi)->name; | |
bb0090e9 PM |
1115 | indio_dev->info = &sca3000_info; |
1116 | if (st->info->temp_output) { | |
1117 | indio_dev->channels = sca3000_channels_with_temp; | |
1118 | indio_dev->num_channels = | |
1119 | ARRAY_SIZE(sca3000_channels_with_temp); | |
1120 | } else { | |
1121 | indio_dev->channels = sca3000_channels; | |
1122 | indio_dev->num_channels = ARRAY_SIZE(sca3000_channels); | |
1123 | } | |
83f0422d | 1124 | indio_dev->modes = INDIO_DIRECT_MODE; |
574fb258 | 1125 | |
83f0422d JC |
1126 | sca3000_configure_ring(indio_dev); |
1127 | ret = iio_device_register(indio_dev); | |
574fb258 | 1128 | if (ret < 0) |
0189d93f | 1129 | return ret; |
d2fffd6c | 1130 | |
3e2c96ea | 1131 | if (spi->irq) { |
25888dc5 JC |
1132 | ret = request_threaded_irq(spi->irq, |
1133 | NULL, | |
1134 | &sca3000_event_handler, | |
a91aff1c | 1135 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
25888dc5 | 1136 | "sca3000", |
83f0422d | 1137 | indio_dev); |
574fb258 | 1138 | if (ret) |
3e1b6c95 | 1139 | goto error_unregister_dev; |
574fb258 | 1140 | } |
83f0422d | 1141 | sca3000_register_ring_funcs(indio_dev); |
574fb258 JC |
1142 | ret = sca3000_clean_setup(st); |
1143 | if (ret) | |
25888dc5 | 1144 | goto error_free_irq; |
574fb258 JC |
1145 | return 0; |
1146 | ||
25888dc5 | 1147 | error_free_irq: |
3e2c96ea | 1148 | if (spi->irq) |
83f0422d | 1149 | free_irq(spi->irq, indio_dev); |
574fb258 | 1150 | error_unregister_dev: |
d2fffd6c | 1151 | iio_device_unregister(indio_dev); |
574fb258 JC |
1152 | return ret; |
1153 | } | |
1154 | ||
1155 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1156 | { | |
1157 | int ret; | |
574fb258 JC |
1158 | |
1159 | mutex_lock(&st->lock); | |
25888dc5 | 1160 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1161 | if (ret) |
1162 | goto error_ret; | |
1163 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 JC |
1164 | (st->rx[0] & |
1165 | ~(SCA3000_INT_MASK_RING_THREE_QUARTER | | |
1166 | SCA3000_INT_MASK_RING_HALF | | |
1167 | SCA3000_INT_MASK_ALL_INTS))); | |
574fb258 | 1168 | error_ret: |
25888dc5 | 1169 | mutex_unlock(&st->lock); |
574fb258 | 1170 | return ret; |
574fb258 JC |
1171 | } |
1172 | ||
447d4f29 | 1173 | static int sca3000_remove(struct spi_device *spi) |
574fb258 | 1174 | { |
83f0422d JC |
1175 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
1176 | struct sca3000_state *st = iio_priv(indio_dev); | |
67ad4e08 | 1177 | |
5262d8fd | 1178 | /* Must ensure no interrupts can be generated after this! */ |
67ad4e08 | 1179 | sca3000_stop_all_interrupts(st); |
3e2c96ea | 1180 | if (spi->irq) |
25888dc5 | 1181 | free_irq(spi->irq, indio_dev); |
d2fffd6c | 1182 | iio_device_unregister(indio_dev); |
574fb258 | 1183 | sca3000_unconfigure_ring(indio_dev); |
574fb258 | 1184 | |
574fb258 JC |
1185 | return 0; |
1186 | } | |
1187 | ||
25888dc5 JC |
1188 | static const struct spi_device_id sca3000_id[] = { |
1189 | {"sca3000_d01", d01}, | |
1190 | {"sca3000_e02", e02}, | |
1191 | {"sca3000_e04", e04}, | |
1192 | {"sca3000_e05", e05}, | |
1193 | {} | |
1194 | }; | |
55e4390c | 1195 | MODULE_DEVICE_TABLE(spi, sca3000_id); |
574fb258 | 1196 | |
25888dc5 JC |
1197 | static struct spi_driver sca3000_driver = { |
1198 | .driver = { | |
1199 | .name = "sca3000", | |
1200 | .owner = THIS_MODULE, | |
1201 | }, | |
1202 | .probe = sca3000_probe, | |
e543acf0 | 1203 | .remove = sca3000_remove, |
25888dc5 JC |
1204 | .id_table = sca3000_id, |
1205 | }; | |
ae6ae6fe | 1206 | module_spi_driver(sca3000_driver); |
574fb258 | 1207 | |
0f8c9620 | 1208 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
574fb258 JC |
1209 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); |
1210 | MODULE_LICENSE("GPL v2"); |