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 | ||
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 | { |
25888dc5 JC |
93 | struct spi_transfer xfer[2] = { |
94 | { | |
95 | .len = 1, | |
96 | .tx_buf = st->tx, | |
97 | }, { | |
98 | .len = len, | |
99 | .rx_buf = st->rx, | |
100 | } | |
574fb258 | 101 | }; |
574fb258 | 102 | st->tx[0] = SCA3000_READ_REG(reg_address_high); |
574fb258 | 103 | |
ad6c46b0 | 104 | return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer)); |
574fb258 | 105 | } |
25888dc5 | 106 | |
574fb258 JC |
107 | /** |
108 | * sca3000_reg_lock_on() test if the ctrl register lock is on | |
109 | * | |
110 | * Lock must be held. | |
111 | **/ | |
112 | static int sca3000_reg_lock_on(struct sca3000_state *st) | |
113 | { | |
574fb258 JC |
114 | int ret; |
115 | ||
25888dc5 | 116 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
117 | if (ret < 0) |
118 | return ret; | |
574fb258 | 119 | |
25888dc5 | 120 | return !(st->rx[0] & SCA3000_LOCKED); |
574fb258 JC |
121 | } |
122 | ||
123 | /** | |
124 | * __sca3000_unlock_reg_lock() unlock the control registers | |
125 | * | |
126 | * Note the device does not appear to support doing this in a single transfer. | |
127 | * This should only ever be used as part of ctrl reg read. | |
128 | * Lock must be held before calling this | |
129 | **/ | |
130 | static int __sca3000_unlock_reg_lock(struct sca3000_state *st) | |
131 | { | |
574fb258 JC |
132 | struct spi_transfer xfer[3] = { |
133 | { | |
574fb258 JC |
134 | .len = 2, |
135 | .cs_change = 1, | |
136 | .tx_buf = st->tx, | |
137 | }, { | |
574fb258 JC |
138 | .len = 2, |
139 | .cs_change = 1, | |
140 | .tx_buf = st->tx + 2, | |
141 | }, { | |
574fb258 | 142 | .len = 2, |
574fb258 JC |
143 | .tx_buf = st->tx + 4, |
144 | }, | |
145 | }; | |
146 | st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
147 | st->tx[1] = 0x00; | |
148 | st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
149 | st->tx[3] = 0x50; | |
150 | st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
151 | st->tx[5] = 0xA0; | |
574fb258 | 152 | |
ad6c46b0 | 153 | return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer)); |
574fb258 JC |
154 | } |
155 | ||
156 | /** | |
157 | * sca3000_write_ctrl_reg() write to a lock protect ctrl register | |
158 | * @sel: selects which registers we wish to write to | |
159 | * @val: the value to be written | |
160 | * | |
161 | * Certain control registers are protected against overwriting by the lock | |
162 | * register and use a shared write address. This function allows writing of | |
163 | * these registers. | |
164 | * Lock must be held. | |
165 | **/ | |
166 | static int sca3000_write_ctrl_reg(struct sca3000_state *st, | |
167 | uint8_t sel, | |
168 | uint8_t val) | |
169 | { | |
170 | ||
171 | int ret; | |
172 | ||
173 | ret = sca3000_reg_lock_on(st); | |
174 | if (ret < 0) | |
175 | goto error_ret; | |
176 | if (ret) { | |
177 | ret = __sca3000_unlock_reg_lock(st); | |
178 | if (ret) | |
179 | goto error_ret; | |
180 | } | |
181 | ||
182 | /* Set the control select register */ | |
183 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel); | |
184 | if (ret) | |
185 | goto error_ret; | |
186 | ||
187 | /* Write the actual value into the register */ | |
188 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val); | |
189 | ||
190 | error_ret: | |
191 | return ret; | |
192 | } | |
193 | ||
194 | /* Crucial that lock is called before calling this */ | |
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 | ||
226 | #ifdef SCA3000_DEBUG | |
227 | /** | |
228 | * sca3000_check_status() check the status register | |
229 | * | |
230 | * Only used for debugging purposes | |
231 | **/ | |
232 | static int sca3000_check_status(struct device *dev) | |
233 | { | |
574fb258 | 234 | int ret; |
4b522ce7 | 235 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 236 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
237 | |
238 | mutex_lock(&st->lock); | |
25888dc5 | 239 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
240 | if (ret < 0) |
241 | goto error_ret; | |
25888dc5 | 242 | if (st->rx[0] & SCA3000_EEPROM_CS_ERROR) |
26de7208 | 243 | dev_err(dev, "eeprom error\n"); |
25888dc5 | 244 | if (st->rx[0] & SCA3000_SPI_FRAME_ERROR) |
574fb258 | 245 | dev_err(dev, "Previous SPI Frame was corrupt\n"); |
574fb258 JC |
246 | |
247 | error_ret: | |
248 | mutex_unlock(&st->lock); | |
249 | return ret; | |
250 | } | |
251 | #endif /* SCA3000_DEBUG */ | |
252 | ||
845bd12a | 253 | |
574fb258 JC |
254 | /** |
255 | * sca3000_show_reg() - sysfs interface to read the chip revision number | |
256 | **/ | |
257 | static ssize_t sca3000_show_rev(struct device *dev, | |
258 | struct device_attribute *attr, | |
259 | char *buf) | |
260 | { | |
261 | int len = 0, ret; | |
4b522ce7 | 262 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 263 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 264 | |
574fb258 | 265 | mutex_lock(&st->lock); |
25888dc5 | 266 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1); |
574fb258 JC |
267 | if (ret < 0) |
268 | goto error_ret; | |
269 | len += sprintf(buf + len, | |
270 | "major=%d, minor=%d\n", | |
25888dc5 JC |
271 | st->rx[0] & SCA3000_REVID_MAJOR_MASK, |
272 | st->rx[0] & SCA3000_REVID_MINOR_MASK); | |
574fb258 JC |
273 | error_ret: |
274 | mutex_unlock(&st->lock); | |
275 | ||
276 | return ret ? ret : len; | |
277 | } | |
278 | ||
279 | /** | |
280 | * sca3000_show_available_measurement_modes() display available modes | |
281 | * | |
282 | * This is all read from chip specific data in the driver. Not all | |
283 | * of the sca3000 series support modes other than normal. | |
284 | **/ | |
285 | static ssize_t | |
286 | sca3000_show_available_measurement_modes(struct device *dev, | |
287 | struct device_attribute *attr, | |
288 | char *buf) | |
289 | { | |
4b522ce7 | 290 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 291 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
292 | int len = 0; |
293 | ||
294 | len += sprintf(buf + len, "0 - normal mode"); | |
295 | switch (st->info->option_mode_1) { | |
296 | case SCA3000_OP_MODE_NARROW: | |
297 | len += sprintf(buf + len, ", 1 - narrow mode"); | |
298 | break; | |
299 | case SCA3000_OP_MODE_BYPASS: | |
300 | len += sprintf(buf + len, ", 1 - bypass mode"); | |
301 | break; | |
c608cb01 | 302 | } |
574fb258 JC |
303 | switch (st->info->option_mode_2) { |
304 | case SCA3000_OP_MODE_WIDE: | |
305 | len += sprintf(buf + len, ", 2 - wide mode"); | |
306 | break; | |
307 | } | |
308 | /* always supported */ | |
26de7208 | 309 | len += sprintf(buf + len, " 3 - motion detection\n"); |
574fb258 JC |
310 | |
311 | return len; | |
312 | } | |
313 | ||
314 | /** | |
315 | * sca3000_show_measurmenet_mode() sysfs read of current mode | |
316 | **/ | |
317 | static ssize_t | |
318 | sca3000_show_measurement_mode(struct device *dev, | |
319 | struct device_attribute *attr, | |
320 | char *buf) | |
321 | { | |
4b522ce7 | 322 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 323 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 324 | int len = 0, ret; |
574fb258 JC |
325 | |
326 | mutex_lock(&st->lock); | |
25888dc5 | 327 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
328 | if (ret) |
329 | goto error_ret; | |
330 | /* mask bottom 2 bits - only ones that are relevant */ | |
25888dc5 JC |
331 | st->rx[0] &= 0x03; |
332 | switch (st->rx[0]) { | |
574fb258 JC |
333 | case SCA3000_MEAS_MODE_NORMAL: |
334 | len += sprintf(buf + len, "0 - normal mode\n"); | |
335 | break; | |
336 | case SCA3000_MEAS_MODE_MOT_DET: | |
337 | len += sprintf(buf + len, "3 - motion detection\n"); | |
338 | break; | |
339 | case SCA3000_MEAS_MODE_OP_1: | |
340 | switch (st->info->option_mode_1) { | |
341 | case SCA3000_OP_MODE_NARROW: | |
342 | len += sprintf(buf + len, "1 - narrow mode\n"); | |
343 | break; | |
344 | case SCA3000_OP_MODE_BYPASS: | |
345 | len += sprintf(buf + len, "1 - bypass mode\n"); | |
346 | break; | |
c608cb01 | 347 | } |
574fb258 JC |
348 | break; |
349 | case SCA3000_MEAS_MODE_OP_2: | |
350 | switch (st->info->option_mode_2) { | |
351 | case SCA3000_OP_MODE_WIDE: | |
352 | len += sprintf(buf + len, "2 - wide mode\n"); | |
353 | break; | |
354 | } | |
355 | break; | |
c608cb01 | 356 | } |
574fb258 JC |
357 | |
358 | error_ret: | |
359 | mutex_unlock(&st->lock); | |
360 | ||
361 | return ret ? ret : len; | |
362 | } | |
363 | ||
364 | /** | |
365 | * sca3000_store_measurement_mode() set the current mode | |
366 | **/ | |
367 | static ssize_t | |
368 | sca3000_store_measurement_mode(struct device *dev, | |
369 | struct device_attribute *attr, | |
370 | const char *buf, | |
371 | size_t len) | |
372 | { | |
4b522ce7 | 373 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
2579a0df | 374 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 375 | int ret; |
bba42776 | 376 | u8 mask = 0x03; |
3b724ca1 | 377 | u8 val; |
574fb258 JC |
378 | |
379 | mutex_lock(&st->lock); | |
3b724ca1 | 380 | ret = kstrtou8(buf, 10, &val); |
574fb258 JC |
381 | if (ret) |
382 | goto error_ret; | |
d666c0d4 AR |
383 | if (val > 3) { |
384 | ret = -EINVAL; | |
385 | goto error_ret; | |
386 | } | |
25888dc5 | 387 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
388 | if (ret) |
389 | goto error_ret; | |
25888dc5 JC |
390 | st->rx[0] &= ~mask; |
391 | st->rx[0] |= (val & mask); | |
392 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]); | |
574fb258 | 393 | if (ret) |
25888dc5 | 394 | goto error_ret; |
574fb258 JC |
395 | mutex_unlock(&st->lock); |
396 | ||
397 | return len; | |
398 | ||
574fb258 JC |
399 | error_ret: |
400 | mutex_unlock(&st->lock); | |
401 | ||
402 | return ret; | |
403 | } | |
404 | ||
405 | ||
406 | /* Not even vaguely standard attributes so defined here rather than | |
407 | * in the relevant IIO core headers | |
408 | */ | |
f3fb0011 | 409 | static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO, |
574fb258 JC |
410 | sca3000_show_available_measurement_modes, |
411 | NULL, 0); | |
412 | ||
413 | static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR, | |
414 | sca3000_show_measurement_mode, | |
415 | sca3000_store_measurement_mode, | |
416 | 0); | |
417 | ||
418 | /* More standard attributes */ | |
419 | ||
355e25c1 | 420 | static IIO_DEVICE_ATTR(revision, S_IRUGO, sca3000_show_rev, NULL, 0); |
574fb258 | 421 | |
25888dc5 JC |
422 | #define SCA3000_EVENT_MASK \ |
423 | (IIO_EV_BIT(IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING)) | |
424 | ||
691a4ca1 JC |
425 | #define SCA3000_CHAN(index, mod) \ |
426 | { \ | |
427 | .type = IIO_ACCEL, \ | |
428 | .modified = 1, \ | |
429 | .channel2 = mod, \ | |
a8b21c5c JC |
430 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
431 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\ | |
691a4ca1 JC |
432 | .address = index, \ |
433 | .scan_index = index, \ | |
434 | .scan_type = { \ | |
435 | .sign = 's', \ | |
436 | .realbits = 11, \ | |
437 | .storagebits = 16, \ | |
438 | .shift = 5, \ | |
439 | }, \ | |
440 | .event_mask = SCA3000_EVENT_MASK, \ | |
441 | } | |
442 | ||
f4e4b955 | 443 | static const struct iio_chan_spec sca3000_channels[] = { |
691a4ca1 JC |
444 | SCA3000_CHAN(0, IIO_MOD_X), |
445 | SCA3000_CHAN(1, IIO_MOD_Y), | |
446 | SCA3000_CHAN(2, IIO_MOD_Z), | |
25888dc5 | 447 | }; |
574fb258 | 448 | |
25888dc5 JC |
449 | static u8 sca3000_addresses[3][3] = { |
450 | [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH, | |
451 | SCA3000_MD_CTRL_OR_X}, | |
452 | [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH, | |
453 | SCA3000_MD_CTRL_OR_Y}, | |
454 | [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH, | |
455 | SCA3000_MD_CTRL_OR_Z}, | |
456 | }; | |
457 | ||
458 | static int sca3000_read_raw(struct iio_dev *indio_dev, | |
459 | struct iio_chan_spec const *chan, | |
460 | int *val, | |
461 | int *val2, | |
462 | long mask) | |
463 | { | |
83f0422d | 464 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
465 | int ret; |
466 | u8 address; | |
467 | ||
468 | switch (mask) { | |
31313fc6 | 469 | case IIO_CHAN_INFO_RAW: |
25888dc5 JC |
470 | mutex_lock(&st->lock); |
471 | if (st->mo_det_use_count) { | |
472 | mutex_unlock(&st->lock); | |
473 | return -EBUSY; | |
474 | } | |
475 | address = sca3000_addresses[chan->address][0]; | |
476 | ret = sca3000_read_data_short(st, address, 2); | |
477 | if (ret < 0) { | |
478 | mutex_unlock(&st->lock); | |
479 | return ret; | |
480 | } | |
481 | *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF; | |
482 | *val = ((*val) << (sizeof(*val)*8 - 13)) >> | |
483 | (sizeof(*val)*8 - 13); | |
484 | mutex_unlock(&st->lock); | |
485 | return IIO_VAL_INT; | |
c8a9f805 | 486 | case IIO_CHAN_INFO_SCALE: |
25888dc5 JC |
487 | *val = 0; |
488 | if (chan->type == IIO_ACCEL) | |
489 | *val2 = st->info->scale; | |
490 | else /* temperature */ | |
491 | *val2 = 555556; | |
492 | return IIO_VAL_INT_PLUS_MICRO; | |
493 | default: | |
494 | return -EINVAL; | |
495 | } | |
496 | } | |
574fb258 JC |
497 | |
498 | /** | |
499 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
500 | * | |
501 | * The later modes are only relevant to the ring buffer - and depend on current | |
502 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
503 | * division will give good enough answer and not all chips have them specified | |
504 | * at all. | |
505 | **/ | |
506 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
507 | struct device_attribute *attr, | |
508 | char *buf) | |
509 | { | |
4b522ce7 | 510 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 511 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
512 | int len = 0, ret, val; |
513 | ||
574fb258 | 514 | mutex_lock(&st->lock); |
25888dc5 JC |
515 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
516 | val = st->rx[0]; | |
574fb258 JC |
517 | mutex_unlock(&st->lock); |
518 | if (ret) | |
519 | goto error_ret; | |
25888dc5 JC |
520 | |
521 | switch (val & 0x03) { | |
574fb258 JC |
522 | case SCA3000_MEAS_MODE_NORMAL: |
523 | len += sprintf(buf + len, "%d %d %d\n", | |
524 | st->info->measurement_mode_freq, | |
525 | st->info->measurement_mode_freq/2, | |
526 | st->info->measurement_mode_freq/4); | |
527 | break; | |
528 | case SCA3000_MEAS_MODE_OP_1: | |
529 | len += sprintf(buf + len, "%d %d %d\n", | |
530 | st->info->option_mode_1_freq, | |
531 | st->info->option_mode_1_freq/2, | |
532 | st->info->option_mode_1_freq/4); | |
533 | break; | |
534 | case SCA3000_MEAS_MODE_OP_2: | |
535 | len += sprintf(buf + len, "%d %d %d\n", | |
536 | st->info->option_mode_2_freq, | |
537 | st->info->option_mode_2_freq/2, | |
538 | st->info->option_mode_2_freq/4); | |
539 | break; | |
c608cb01 | 540 | } |
574fb258 JC |
541 | return len; |
542 | error_ret: | |
543 | return ret; | |
544 | } | |
545 | /** | |
546 | * __sca3000_get_base_frequency() obtain mode specific base frequency | |
547 | * | |
548 | * lock must be held | |
549 | **/ | |
550 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
551 | const struct sca3000_chip_info *info, | |
552 | int *base_freq) | |
553 | { | |
554 | int ret; | |
574fb258 | 555 | |
25888dc5 | 556 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
557 | if (ret) |
558 | goto error_ret; | |
25888dc5 | 559 | switch (0x03 & st->rx[0]) { |
574fb258 JC |
560 | case SCA3000_MEAS_MODE_NORMAL: |
561 | *base_freq = info->measurement_mode_freq; | |
562 | break; | |
563 | case SCA3000_MEAS_MODE_OP_1: | |
564 | *base_freq = info->option_mode_1_freq; | |
565 | break; | |
566 | case SCA3000_MEAS_MODE_OP_2: | |
567 | *base_freq = info->option_mode_2_freq; | |
568 | break; | |
c608cb01 | 569 | } |
574fb258 JC |
570 | error_ret: |
571 | return ret; | |
572 | } | |
573 | ||
574 | /** | |
575 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
576 | **/ | |
577 | static ssize_t sca3000_read_frequency(struct device *dev, | |
578 | struct device_attribute *attr, | |
579 | char *buf) | |
580 | { | |
4b522ce7 | 581 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 582 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
583 | int ret, len = 0, base_freq = 0, val; |
584 | ||
574fb258 JC |
585 | mutex_lock(&st->lock); |
586 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
587 | if (ret) | |
588 | goto error_ret_mut; | |
25888dc5 | 589 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
574fb258 JC |
590 | mutex_unlock(&st->lock); |
591 | if (ret) | |
592 | goto error_ret; | |
25888dc5 | 593 | val = ret; |
574fb258 | 594 | if (base_freq > 0) |
25888dc5 | 595 | switch (val & 0x03) { |
574fb258 JC |
596 | case 0x00: |
597 | case 0x03: | |
598 | len = sprintf(buf, "%d\n", base_freq); | |
599 | break; | |
600 | case 0x01: | |
601 | len = sprintf(buf, "%d\n", base_freq/2); | |
602 | break; | |
603 | case 0x02: | |
604 | len = sprintf(buf, "%d\n", base_freq/4); | |
605 | break; | |
c608cb01 | 606 | } |
25888dc5 | 607 | |
574fb258 JC |
608 | return len; |
609 | error_ret_mut: | |
610 | mutex_unlock(&st->lock); | |
611 | error_ret: | |
612 | return ret; | |
613 | } | |
614 | ||
615 | /** | |
616 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
617 | **/ | |
618 | static ssize_t sca3000_set_frequency(struct device *dev, | |
619 | struct device_attribute *attr, | |
620 | const char *buf, | |
621 | size_t len) | |
622 | { | |
4b522ce7 | 623 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 624 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 625 | int ret, base_freq = 0; |
25888dc5 | 626 | int ctrlval; |
574fb258 JC |
627 | long val; |
628 | ||
629 | ret = strict_strtol(buf, 10, &val); | |
630 | if (ret) | |
631 | return ret; | |
632 | ||
633 | mutex_lock(&st->lock); | |
634 | /* What mode are we in? */ | |
635 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
636 | if (ret) | |
637 | goto error_free_lock; | |
638 | ||
25888dc5 JC |
639 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
640 | if (ret < 0) | |
574fb258 | 641 | goto error_free_lock; |
25888dc5 | 642 | ctrlval = ret; |
574fb258 | 643 | /* clear the bits */ |
25888dc5 | 644 | ctrlval &= ~0x03; |
574fb258 JC |
645 | |
646 | if (val == base_freq/2) { | |
25888dc5 | 647 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2; |
574fb258 | 648 | } else if (val == base_freq/4) { |
25888dc5 | 649 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4; |
574fb258 JC |
650 | } else if (val != base_freq) { |
651 | ret = -EINVAL; | |
652 | goto error_free_lock; | |
653 | } | |
25888dc5 JC |
654 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, |
655 | ctrlval); | |
574fb258 JC |
656 | error_free_lock: |
657 | mutex_unlock(&st->lock); | |
658 | ||
659 | return ret ? ret : len; | |
660 | } | |
661 | ||
662 | /* Should only really be registered if ring buffer support is compiled in. | |
663 | * Does no harm however and doing it right would add a fair bit of complexity | |
664 | */ | |
f3fb0011 | 665 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq); |
574fb258 JC |
666 | |
667 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
668 | sca3000_read_frequency, | |
669 | sca3000_set_frequency); | |
670 | ||
671 | ||
672 | /** | |
673 | * sca3000_read_temp() sysfs interface to get the temperature when available | |
674 | * | |
675 | * The alignment of data in here is downright odd. See data sheet. | |
676 | * Converting this into a meaningful value is left to inline functions in | |
677 | * userspace part of header. | |
678 | **/ | |
679 | static ssize_t sca3000_read_temp(struct device *dev, | |
680 | struct device_attribute *attr, | |
681 | char *buf) | |
682 | { | |
4b522ce7 | 683 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 684 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 685 | int ret; |
574fb258 | 686 | int val; |
25888dc5 | 687 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2); |
574fb258 JC |
688 | if (ret < 0) |
689 | goto error_ret; | |
25888dc5 | 690 | val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5); |
574fb258 | 691 | |
25888dc5 | 692 | return sprintf(buf, "%d\n", val); |
574fb258 JC |
693 | |
694 | error_ret: | |
695 | return ret; | |
696 | } | |
f3fb0011 JC |
697 | static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp); |
698 | ||
51a0a5b0 MS |
699 | static IIO_CONST_ATTR_TEMP_SCALE("0.555556"); |
700 | static IIO_CONST_ATTR_TEMP_OFFSET("-214.6"); | |
574fb258 JC |
701 | |
702 | /** | |
25888dc5 | 703 | * sca3000_read_thresh() - query of a threshold |
574fb258 | 704 | **/ |
25888dc5 | 705 | static int sca3000_read_thresh(struct iio_dev *indio_dev, |
330c6c57 | 706 | u64 e, |
25888dc5 | 707 | int *val) |
574fb258 | 708 | { |
25888dc5 | 709 | int ret, i; |
83f0422d | 710 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 711 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 712 | mutex_lock(&st->lock); |
25888dc5 | 713 | ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]); |
574fb258 | 714 | mutex_unlock(&st->lock); |
25888dc5 | 715 | if (ret < 0) |
574fb258 | 716 | return ret; |
25888dc5 JC |
717 | *val = 0; |
718 | if (num == 1) | |
719 | for_each_set_bit(i, (unsigned long *)&ret, | |
720 | ARRAY_SIZE(st->info->mot_det_mult_y)) | |
721 | *val += st->info->mot_det_mult_y[i]; | |
722 | else | |
723 | for_each_set_bit(i, (unsigned long *)&ret, | |
724 | ARRAY_SIZE(st->info->mot_det_mult_xz)) | |
725 | *val += st->info->mot_det_mult_xz[i]; | |
574fb258 | 726 | |
25888dc5 | 727 | return 0; |
574fb258 JC |
728 | } |
729 | ||
730 | /** | |
25888dc5 | 731 | * sca3000_write_thresh() control of threshold |
574fb258 | 732 | **/ |
25888dc5 | 733 | static int sca3000_write_thresh(struct iio_dev *indio_dev, |
330c6c57 JC |
734 | u64 e, |
735 | int val) | |
574fb258 | 736 | { |
83f0422d | 737 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 738 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 739 | int ret; |
25888dc5 JC |
740 | int i; |
741 | u8 nonlinear = 0; | |
742 | ||
743 | if (num == 1) { | |
744 | i = ARRAY_SIZE(st->info->mot_det_mult_y); | |
745 | while (i > 0) | |
746 | if (val >= st->info->mot_det_mult_y[--i]) { | |
747 | nonlinear |= (1 << i); | |
748 | val -= st->info->mot_det_mult_y[i]; | |
749 | } | |
750 | } else { | |
751 | i = ARRAY_SIZE(st->info->mot_det_mult_xz); | |
752 | while (i > 0) | |
753 | if (val >= st->info->mot_det_mult_xz[--i]) { | |
754 | nonlinear |= (1 << i); | |
755 | val -= st->info->mot_det_mult_xz[i]; | |
756 | } | |
757 | } | |
574fb258 | 758 | |
574fb258 | 759 | mutex_lock(&st->lock); |
25888dc5 | 760 | ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear); |
574fb258 JC |
761 | mutex_unlock(&st->lock); |
762 | ||
25888dc5 | 763 | return ret; |
574fb258 JC |
764 | } |
765 | ||
574fb258 | 766 | static struct attribute *sca3000_attributes[] = { |
574fb258 | 767 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 768 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 769 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 770 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
771 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
772 | NULL, | |
773 | }; | |
774 | ||
775 | static struct attribute *sca3000_attributes_with_temp[] = { | |
574fb258 | 776 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 777 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 778 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 779 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
780 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
781 | /* Only present if temp sensor is */ | |
322c9563 JC |
782 | &iio_dev_attr_in_temp_raw.dev_attr.attr, |
783 | &iio_const_attr_in_temp_offset.dev_attr.attr, | |
784 | &iio_const_attr_in_temp_scale.dev_attr.attr, | |
574fb258 JC |
785 | NULL, |
786 | }; | |
787 | ||
788 | static const struct attribute_group sca3000_attribute_group = { | |
789 | .attrs = sca3000_attributes, | |
790 | }; | |
791 | ||
792 | static const struct attribute_group sca3000_attribute_group_with_temp = { | |
793 | .attrs = sca3000_attributes_with_temp, | |
794 | }; | |
795 | ||
796 | /* RING RELATED interrupt handler */ | |
797 | /* depending on event, push to the ring buffer event chrdev or the event one */ | |
798 | ||
799 | /** | |
25888dc5 | 800 | * sca3000_event_handler() - handling ring and non ring events |
574fb258 JC |
801 | * |
802 | * This function is complicated by the fact that the devices can signify ring | |
803 | * and non ring events via the same interrupt line and they can only | |
804 | * be distinguished via a read of the relevant status register. | |
805 | **/ | |
25888dc5 | 806 | static irqreturn_t sca3000_event_handler(int irq, void *private) |
574fb258 | 807 | { |
25888dc5 | 808 | struct iio_dev *indio_dev = private; |
83f0422d | 809 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
810 | int ret, val; |
811 | s64 last_timestamp = iio_get_time_ns(); | |
574fb258 JC |
812 | |
813 | /* Could lead if badly timed to an extra read of status reg, | |
814 | * but ensures no interrupt is missed. | |
815 | */ | |
574fb258 | 816 | mutex_lock(&st->lock); |
25888dc5 JC |
817 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
818 | val = st->rx[0]; | |
574fb258 JC |
819 | mutex_unlock(&st->lock); |
820 | if (ret) | |
821 | goto done; | |
822 | ||
14555b14 | 823 | sca3000_ring_int_process(val, indio_dev->buffer); |
574fb258 | 824 | |
25888dc5 | 825 | if (val & SCA3000_INT_STATUS_FREE_FALL) |
5aa96188 | 826 | iio_push_event(indio_dev, |
c4b14d99 | 827 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 828 | 0, |
c4b14d99 | 829 | IIO_MOD_X_AND_Y_AND_Z, |
de9fe32a JC |
830 | IIO_EV_TYPE_MAG, |
831 | IIO_EV_DIR_FALLING), | |
25888dc5 | 832 | last_timestamp); |
574fb258 | 833 | |
25888dc5 | 834 | if (val & SCA3000_INT_STATUS_Y_TRIGGER) |
5aa96188 | 835 | iio_push_event(indio_dev, |
c4b14d99 | 836 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 837 | 0, |
c4b14d99 | 838 | IIO_MOD_Y, |
de9fe32a JC |
839 | IIO_EV_TYPE_MAG, |
840 | IIO_EV_DIR_RISING), | |
25888dc5 | 841 | last_timestamp); |
574fb258 | 842 | |
25888dc5 | 843 | if (val & SCA3000_INT_STATUS_X_TRIGGER) |
5aa96188 | 844 | iio_push_event(indio_dev, |
c4b14d99 | 845 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 846 | 0, |
c4b14d99 | 847 | IIO_MOD_X, |
de9fe32a JC |
848 | IIO_EV_TYPE_MAG, |
849 | IIO_EV_DIR_RISING), | |
25888dc5 | 850 | last_timestamp); |
574fb258 | 851 | |
25888dc5 | 852 | if (val & SCA3000_INT_STATUS_Z_TRIGGER) |
5aa96188 | 853 | iio_push_event(indio_dev, |
c4b14d99 | 854 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 855 | 0, |
c4b14d99 | 856 | IIO_MOD_Z, |
de9fe32a JC |
857 | IIO_EV_TYPE_MAG, |
858 | IIO_EV_DIR_RISING), | |
25888dc5 | 859 | last_timestamp); |
574fb258 JC |
860 | |
861 | done: | |
25888dc5 | 862 | return IRQ_HANDLED; |
574fb258 JC |
863 | } |
864 | ||
865 | /** | |
25888dc5 | 866 | * sca3000_read_event_config() what events are enabled |
574fb258 | 867 | **/ |
25888dc5 | 868 | static int sca3000_read_event_config(struct iio_dev *indio_dev, |
330c6c57 | 869 | u64 e) |
574fb258 | 870 | { |
83f0422d | 871 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 872 | int ret; |
574fb258 | 873 | u8 protect_mask = 0x03; |
25888dc5 | 874 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
875 | |
876 | /* read current value of mode register */ | |
877 | mutex_lock(&st->lock); | |
25888dc5 | 878 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
879 | if (ret) |
880 | goto error_ret; | |
881 | ||
25888dc5 JC |
882 | if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) |
883 | ret = 0; | |
574fb258 | 884 | else { |
25888dc5 JC |
885 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
886 | if (ret < 0) | |
574fb258 JC |
887 | goto error_ret; |
888 | /* only supporting logical or's for now */ | |
25888dc5 | 889 | ret = !!(ret & sca3000_addresses[num][2]); |
574fb258 | 890 | } |
574fb258 JC |
891 | error_ret: |
892 | mutex_unlock(&st->lock); | |
893 | ||
25888dc5 | 894 | return ret; |
574fb258 JC |
895 | } |
896 | /** | |
897 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
898 | **/ | |
899 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
900 | struct device_attribute *attr, | |
901 | char *buf) | |
902 | { | |
903 | int ret, len; | |
4b522ce7 | 904 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 905 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 906 | int val; |
574fb258 JC |
907 | |
908 | mutex_lock(&st->lock); | |
25888dc5 JC |
909 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
910 | val = st->rx[0]; | |
574fb258 | 911 | mutex_unlock(&st->lock); |
25888dc5 | 912 | if (ret < 0) |
574fb258 JC |
913 | return ret; |
914 | len = sprintf(buf, "%d\n", | |
25888dc5 | 915 | !!(val & SCA3000_FREE_FALL_DETECT)); |
574fb258 JC |
916 | return len; |
917 | } | |
574fb258 JC |
918 | |
919 | /** | |
920 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
921 | * | |
922 | * In these chips the free fall detector should send an interrupt if | |
923 | * the device falls more than 25cm. This has not been tested due | |
924 | * to fragile wiring. | |
925 | **/ | |
926 | ||
927 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, | |
928 | struct device_attribute *attr, | |
929 | const char *buf, | |
930 | size_t len) | |
931 | { | |
4b522ce7 | 932 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 933 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
934 | long val; |
935 | int ret; | |
574fb258 JC |
936 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; |
937 | ||
938 | mutex_lock(&st->lock); | |
939 | ret = strict_strtol(buf, 10, &val); | |
940 | if (ret) | |
941 | goto error_ret; | |
942 | ||
943 | /* read current value of mode register */ | |
25888dc5 | 944 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
945 | if (ret) |
946 | goto error_ret; | |
947 | ||
948 | /*if off and should be on*/ | |
25888dc5 | 949 | if (val && !(st->rx[0] & protect_mask)) |
574fb258 | 950 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 951 | (st->rx[0] | SCA3000_FREE_FALL_DETECT)); |
574fb258 | 952 | /* if on and should be off */ |
25888dc5 | 953 | else if (!val && (st->rx[0] & protect_mask)) |
574fb258 | 954 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 955 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
956 | error_ret: |
957 | mutex_unlock(&st->lock); | |
958 | ||
959 | return ret ? ret : len; | |
960 | } | |
961 | ||
962 | /** | |
963 | * sca3000_set_mo_det() simple on off control for motion detector | |
964 | * | |
965 | * This is a per axis control, but enabling any will result in the | |
966 | * motion detector unit being enabled. | |
967 | * N.B. enabling motion detector stops normal data acquisition. | |
968 | * There is a complexity in knowing which mode to return to when | |
969 | * this mode is disabled. Currently normal mode is assumed. | |
970 | **/ | |
25888dc5 | 971 | static int sca3000_write_event_config(struct iio_dev *indio_dev, |
330c6c57 | 972 | u64 e, |
25888dc5 | 973 | int state) |
574fb258 | 974 | { |
83f0422d | 975 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 976 | int ret, ctrlval; |
574fb258 | 977 | u8 protect_mask = 0x03; |
25888dc5 | 978 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
979 | |
980 | mutex_lock(&st->lock); | |
981 | /* First read the motion detector config to find out if | |
982 | * this axis is on*/ | |
25888dc5 JC |
983 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
984 | if (ret < 0) | |
574fb258 | 985 | goto exit_point; |
25888dc5 | 986 | ctrlval = ret; |
574fb258 | 987 | /* Off and should be on */ |
25888dc5 | 988 | if (state && !(ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
989 | ret = sca3000_write_ctrl_reg(st, |
990 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
991 | ctrlval | |
992 | sca3000_addresses[num][2]); | |
574fb258 | 993 | if (ret) |
25888dc5 | 994 | goto exit_point; |
574fb258 | 995 | st->mo_det_use_count++; |
25888dc5 | 996 | } else if (!state && (ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
997 | ret = sca3000_write_ctrl_reg(st, |
998 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
999 | ctrlval & |
1000 | ~(sca3000_addresses[num][2])); | |
574fb258 | 1001 | if (ret) |
25888dc5 | 1002 | goto exit_point; |
574fb258 | 1003 | st->mo_det_use_count--; |
25888dc5 JC |
1004 | } |
1005 | ||
574fb258 | 1006 | /* read current value of mode register */ |
25888dc5 | 1007 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1008 | if (ret) |
1009 | goto exit_point; | |
1010 | /*if off and should be on*/ | |
1011 | if ((st->mo_det_use_count) | |
25888dc5 | 1012 | && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1013 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1014 | (st->rx[0] & ~protect_mask) |
574fb258 JC |
1015 | | SCA3000_MEAS_MODE_MOT_DET); |
1016 | /* if on and should be off */ | |
1017 | else if (!(st->mo_det_use_count) | |
25888dc5 | 1018 | && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1019 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1020 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
1021 | exit_point: |
1022 | mutex_unlock(&st->lock); | |
1023 | ||
25888dc5 | 1024 | return ret; |
574fb258 JC |
1025 | } |
1026 | ||
574fb258 | 1027 | /* Free fall detector related event attribute */ |
aaf370db | 1028 | static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, |
322c9563 | 1029 | in_accel_x&y&z_mag_falling_en, |
aaf370db JC |
1030 | S_IRUGO | S_IWUSR, |
1031 | sca3000_query_free_fall_mode, | |
1032 | sca3000_set_free_fall_mode, | |
1033 | 0); | |
fc5d0e42 | 1034 | |
25888dc5 | 1035 | static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period, |
322c9563 | 1036 | in_accel_x&y&z_mag_falling_period, |
25888dc5 | 1037 | "0.226"); |
574fb258 JC |
1038 | |
1039 | static struct attribute *sca3000_event_attributes[] = { | |
aaf370db | 1040 | &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr, |
fc5d0e42 | 1041 | &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr, |
574fb258 JC |
1042 | NULL, |
1043 | }; | |
1044 | ||
1045 | static struct attribute_group sca3000_event_attribute_group = { | |
1046 | .attrs = sca3000_event_attributes, | |
8e7d9672 | 1047 | .name = "events", |
574fb258 JC |
1048 | }; |
1049 | ||
1050 | /** | |
1051 | * sca3000_clean_setup() get the device into a predictable state | |
1052 | * | |
1053 | * Devices use flash memory to store many of the register values | |
1054 | * and hence can come up in somewhat unpredictable states. | |
1055 | * Hence reset everything on driver load. | |
1056 | **/ | |
1057 | static int sca3000_clean_setup(struct sca3000_state *st) | |
1058 | { | |
1059 | int ret; | |
574fb258 JC |
1060 | |
1061 | mutex_lock(&st->lock); | |
1062 | /* Ensure all interrupts have been acknowledged */ | |
25888dc5 | 1063 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
574fb258 JC |
1064 | if (ret) |
1065 | goto error_ret; | |
574fb258 JC |
1066 | |
1067 | /* Turn off all motion detection channels */ | |
25888dc5 JC |
1068 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
1069 | if (ret < 0) | |
574fb258 | 1070 | goto error_ret; |
25888dc5 JC |
1071 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL, |
1072 | ret & SCA3000_MD_CTRL_PROT_MASK); | |
574fb258 JC |
1073 | if (ret) |
1074 | goto error_ret; | |
1075 | ||
1076 | /* Disable ring buffer */ | |
25888dc5 JC |
1077 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
1078 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1079 | (ret & SCA3000_OUT_CTRL_PROT_MASK) | |
574fb258 JC |
1080 | | SCA3000_OUT_CTRL_BUF_X_EN |
1081 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1082 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1083 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
574fb258 JC |
1084 | if (ret) |
1085 | goto error_ret; | |
1086 | /* Enable interrupts, relevant to mode and set up as active low */ | |
25888dc5 | 1087 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1088 | if (ret) |
1089 | goto error_ret; | |
1090 | ret = sca3000_write_reg(st, | |
1091 | SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 | 1092 | (ret & SCA3000_INT_MASK_PROT_MASK) |
574fb258 | 1093 | | SCA3000_INT_MASK_ACTIVE_LOW); |
574fb258 JC |
1094 | if (ret) |
1095 | goto error_ret; | |
1096 | /* Select normal measurement mode, free fall off, ring off */ | |
1097 | /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1098 | * as that occurs in one of the example on the datasheet */ | |
25888dc5 | 1099 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1100 | if (ret) |
1101 | goto error_ret; | |
25888dc5 JC |
1102 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
1103 | (st->rx[0] & SCA3000_MODE_PROT_MASK)); | |
574fb258 JC |
1104 | st->bpse = 11; |
1105 | ||
1106 | error_ret: | |
1107 | mutex_unlock(&st->lock); | |
1108 | return ret; | |
1109 | } | |
1110 | ||
6fe8135f JC |
1111 | static const struct iio_info sca3000_info = { |
1112 | .attrs = &sca3000_attribute_group, | |
1113 | .read_raw = &sca3000_read_raw, | |
6fe8135f JC |
1114 | .event_attrs = &sca3000_event_attribute_group, |
1115 | .read_event_value = &sca3000_read_thresh, | |
1116 | .write_event_value = &sca3000_write_thresh, | |
1117 | .read_event_config = &sca3000_read_event_config, | |
1118 | .write_event_config = &sca3000_write_event_config, | |
1119 | .driver_module = THIS_MODULE, | |
1120 | }; | |
1121 | ||
1122 | static const struct iio_info sca3000_info_with_temp = { | |
1123 | .attrs = &sca3000_attribute_group_with_temp, | |
1124 | .read_raw = &sca3000_read_raw, | |
1125 | .read_event_value = &sca3000_read_thresh, | |
1126 | .write_event_value = &sca3000_write_thresh, | |
1127 | .read_event_config = &sca3000_read_event_config, | |
1128 | .write_event_config = &sca3000_write_event_config, | |
1129 | .driver_module = THIS_MODULE, | |
1130 | }; | |
1131 | ||
4ae1c61f | 1132 | static int sca3000_probe(struct spi_device *spi) |
574fb258 | 1133 | { |
d2fffd6c | 1134 | int ret; |
574fb258 | 1135 | struct sca3000_state *st; |
83f0422d | 1136 | struct iio_dev *indio_dev; |
574fb258 | 1137 | |
7cbb7537 | 1138 | indio_dev = iio_device_alloc(sizeof(*st)); |
83f0422d | 1139 | if (indio_dev == NULL) { |
574fb258 JC |
1140 | ret = -ENOMEM; |
1141 | goto error_ret; | |
1142 | } | |
574fb258 | 1143 | |
03bda05d | 1144 | st = iio_priv(indio_dev); |
83f0422d | 1145 | spi_set_drvdata(spi, indio_dev); |
574fb258 JC |
1146 | st->us = spi; |
1147 | mutex_init(&st->lock); | |
25888dc5 JC |
1148 | st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi) |
1149 | ->driver_data]; | |
574fb258 | 1150 | |
83f0422d JC |
1151 | indio_dev->dev.parent = &spi->dev; |
1152 | indio_dev->name = spi_get_device_id(spi)->name; | |
574fb258 | 1153 | if (st->info->temp_output) |
83f0422d | 1154 | indio_dev->info = &sca3000_info_with_temp; |
25888dc5 | 1155 | else { |
83f0422d JC |
1156 | indio_dev->info = &sca3000_info; |
1157 | indio_dev->channels = sca3000_channels; | |
1158 | indio_dev->num_channels = ARRAY_SIZE(sca3000_channels); | |
25888dc5 | 1159 | } |
83f0422d | 1160 | indio_dev->modes = INDIO_DIRECT_MODE; |
574fb258 | 1161 | |
83f0422d JC |
1162 | sca3000_configure_ring(indio_dev); |
1163 | ret = iio_device_register(indio_dev); | |
574fb258 JC |
1164 | if (ret < 0) |
1165 | goto error_free_dev; | |
d2fffd6c | 1166 | |
14555b14 JC |
1167 | ret = iio_buffer_register(indio_dev, |
1168 | sca3000_channels, | |
1169 | ARRAY_SIZE(sca3000_channels)); | |
574fb258 JC |
1170 | if (ret < 0) |
1171 | goto error_unregister_dev; | |
14555b14 | 1172 | if (indio_dev->buffer) { |
f79a9098 JC |
1173 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 0); |
1174 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 1); | |
1175 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 2); | |
bd94c6a8 JC |
1176 | } |
1177 | ||
3e2c96ea | 1178 | if (spi->irq) { |
25888dc5 JC |
1179 | ret = request_threaded_irq(spi->irq, |
1180 | NULL, | |
1181 | &sca3000_event_handler, | |
a91aff1c | 1182 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
25888dc5 | 1183 | "sca3000", |
83f0422d | 1184 | indio_dev); |
574fb258 JC |
1185 | if (ret) |
1186 | goto error_unregister_ring; | |
574fb258 | 1187 | } |
83f0422d | 1188 | sca3000_register_ring_funcs(indio_dev); |
574fb258 JC |
1189 | ret = sca3000_clean_setup(st); |
1190 | if (ret) | |
25888dc5 | 1191 | goto error_free_irq; |
574fb258 JC |
1192 | return 0; |
1193 | ||
25888dc5 | 1194 | error_free_irq: |
3e2c96ea | 1195 | if (spi->irq) |
83f0422d | 1196 | free_irq(spi->irq, indio_dev); |
574fb258 | 1197 | error_unregister_ring: |
14555b14 | 1198 | iio_buffer_unregister(indio_dev); |
574fb258 | 1199 | error_unregister_dev: |
d2fffd6c | 1200 | iio_device_unregister(indio_dev); |
574fb258 | 1201 | error_free_dev: |
7cbb7537 | 1202 | iio_device_free(indio_dev); |
83f0422d | 1203 | |
574fb258 JC |
1204 | error_ret: |
1205 | return ret; | |
1206 | } | |
1207 | ||
1208 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1209 | { | |
1210 | int ret; | |
574fb258 JC |
1211 | |
1212 | mutex_lock(&st->lock); | |
25888dc5 | 1213 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1214 | if (ret) |
1215 | goto error_ret; | |
1216 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 JC |
1217 | (st->rx[0] & |
1218 | ~(SCA3000_INT_MASK_RING_THREE_QUARTER | | |
1219 | SCA3000_INT_MASK_RING_HALF | | |
1220 | SCA3000_INT_MASK_ALL_INTS))); | |
574fb258 | 1221 | error_ret: |
25888dc5 | 1222 | mutex_unlock(&st->lock); |
574fb258 | 1223 | return ret; |
574fb258 JC |
1224 | } |
1225 | ||
447d4f29 | 1226 | static int sca3000_remove(struct spi_device *spi) |
574fb258 | 1227 | { |
83f0422d JC |
1228 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
1229 | struct sca3000_state *st = iio_priv(indio_dev); | |
67ad4e08 | 1230 | |
574fb258 | 1231 | /* Must ensure no interrupts can be generated after this!*/ |
67ad4e08 | 1232 | sca3000_stop_all_interrupts(st); |
3e2c96ea | 1233 | if (spi->irq) |
25888dc5 | 1234 | free_irq(spi->irq, indio_dev); |
d2fffd6c | 1235 | iio_device_unregister(indio_dev); |
14555b14 | 1236 | iio_buffer_unregister(indio_dev); |
574fb258 | 1237 | sca3000_unconfigure_ring(indio_dev); |
7cbb7537 | 1238 | iio_device_free(indio_dev); |
574fb258 | 1239 | |
574fb258 JC |
1240 | return 0; |
1241 | } | |
1242 | ||
25888dc5 JC |
1243 | static const struct spi_device_id sca3000_id[] = { |
1244 | {"sca3000_d01", d01}, | |
1245 | {"sca3000_e02", e02}, | |
1246 | {"sca3000_e04", e04}, | |
1247 | {"sca3000_e05", e05}, | |
1248 | {} | |
1249 | }; | |
55e4390c | 1250 | MODULE_DEVICE_TABLE(spi, sca3000_id); |
574fb258 | 1251 | |
25888dc5 JC |
1252 | static struct spi_driver sca3000_driver = { |
1253 | .driver = { | |
1254 | .name = "sca3000", | |
1255 | .owner = THIS_MODULE, | |
1256 | }, | |
1257 | .probe = sca3000_probe, | |
e543acf0 | 1258 | .remove = sca3000_remove, |
25888dc5 JC |
1259 | .id_table = sca3000_id, |
1260 | }; | |
ae6ae6fe | 1261 | module_spi_driver(sca3000_driver); |
574fb258 | 1262 | |
0f8c9620 | 1263 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
574fb258 JC |
1264 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); |
1265 | MODULE_LICENSE("GPL v2"); |