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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 | |
129c3f61 LPC |
422 | static const struct iio_event_spec sca3000_event = { |
423 | .type = IIO_EV_TYPE_MAG, | |
424 | .dir = IIO_EV_DIR_RISING, | |
425 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | BIT(IIO_EV_INFO_ENABLE), | |
426 | }; | |
25888dc5 | 427 | |
691a4ca1 JC |
428 | #define SCA3000_CHAN(index, mod) \ |
429 | { \ | |
430 | .type = IIO_ACCEL, \ | |
431 | .modified = 1, \ | |
432 | .channel2 = mod, \ | |
a8b21c5c JC |
433 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
434 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\ | |
691a4ca1 JC |
435 | .address = index, \ |
436 | .scan_index = index, \ | |
437 | .scan_type = { \ | |
438 | .sign = 's', \ | |
439 | .realbits = 11, \ | |
440 | .storagebits = 16, \ | |
441 | .shift = 5, \ | |
442 | }, \ | |
129c3f61 LPC |
443 | .event_spec = &sca3000_event, \ |
444 | .num_event_specs = 1, \ | |
691a4ca1 JC |
445 | } |
446 | ||
f4e4b955 | 447 | static const struct iio_chan_spec sca3000_channels[] = { |
691a4ca1 JC |
448 | SCA3000_CHAN(0, IIO_MOD_X), |
449 | SCA3000_CHAN(1, IIO_MOD_Y), | |
450 | SCA3000_CHAN(2, IIO_MOD_Z), | |
25888dc5 | 451 | }; |
574fb258 | 452 | |
25888dc5 JC |
453 | static u8 sca3000_addresses[3][3] = { |
454 | [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH, | |
455 | SCA3000_MD_CTRL_OR_X}, | |
456 | [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH, | |
457 | SCA3000_MD_CTRL_OR_Y}, | |
458 | [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH, | |
459 | SCA3000_MD_CTRL_OR_Z}, | |
460 | }; | |
461 | ||
462 | static int sca3000_read_raw(struct iio_dev *indio_dev, | |
463 | struct iio_chan_spec const *chan, | |
464 | int *val, | |
465 | int *val2, | |
466 | long mask) | |
467 | { | |
83f0422d | 468 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
469 | int ret; |
470 | u8 address; | |
471 | ||
472 | switch (mask) { | |
31313fc6 | 473 | case IIO_CHAN_INFO_RAW: |
25888dc5 JC |
474 | mutex_lock(&st->lock); |
475 | if (st->mo_det_use_count) { | |
476 | mutex_unlock(&st->lock); | |
477 | return -EBUSY; | |
478 | } | |
479 | address = sca3000_addresses[chan->address][0]; | |
480 | ret = sca3000_read_data_short(st, address, 2); | |
481 | if (ret < 0) { | |
482 | mutex_unlock(&st->lock); | |
483 | return ret; | |
484 | } | |
485 | *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF; | |
486 | *val = ((*val) << (sizeof(*val)*8 - 13)) >> | |
487 | (sizeof(*val)*8 - 13); | |
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; | |
497 | default: | |
498 | return -EINVAL; | |
499 | } | |
500 | } | |
574fb258 JC |
501 | |
502 | /** | |
503 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
504 | * | |
505 | * The later modes are only relevant to the ring buffer - and depend on current | |
506 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
507 | * division will give good enough answer and not all chips have them specified | |
508 | * at all. | |
509 | **/ | |
510 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
511 | struct device_attribute *attr, | |
512 | char *buf) | |
513 | { | |
4b522ce7 | 514 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 515 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
516 | int len = 0, ret, val; |
517 | ||
574fb258 | 518 | mutex_lock(&st->lock); |
25888dc5 JC |
519 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
520 | val = st->rx[0]; | |
574fb258 JC |
521 | mutex_unlock(&st->lock); |
522 | if (ret) | |
523 | goto error_ret; | |
25888dc5 JC |
524 | |
525 | switch (val & 0x03) { | |
574fb258 JC |
526 | case SCA3000_MEAS_MODE_NORMAL: |
527 | len += sprintf(buf + len, "%d %d %d\n", | |
528 | st->info->measurement_mode_freq, | |
529 | st->info->measurement_mode_freq/2, | |
530 | st->info->measurement_mode_freq/4); | |
531 | break; | |
532 | case SCA3000_MEAS_MODE_OP_1: | |
533 | len += sprintf(buf + len, "%d %d %d\n", | |
534 | st->info->option_mode_1_freq, | |
535 | st->info->option_mode_1_freq/2, | |
536 | st->info->option_mode_1_freq/4); | |
537 | break; | |
538 | case SCA3000_MEAS_MODE_OP_2: | |
539 | len += sprintf(buf + len, "%d %d %d\n", | |
540 | st->info->option_mode_2_freq, | |
541 | st->info->option_mode_2_freq/2, | |
542 | st->info->option_mode_2_freq/4); | |
543 | break; | |
c608cb01 | 544 | } |
574fb258 JC |
545 | return len; |
546 | error_ret: | |
547 | return ret; | |
548 | } | |
549 | /** | |
550 | * __sca3000_get_base_frequency() obtain mode specific base frequency | |
551 | * | |
552 | * lock must be held | |
553 | **/ | |
554 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
555 | const struct sca3000_chip_info *info, | |
556 | int *base_freq) | |
557 | { | |
558 | int ret; | |
574fb258 | 559 | |
25888dc5 | 560 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
561 | if (ret) |
562 | goto error_ret; | |
25888dc5 | 563 | switch (0x03 & st->rx[0]) { |
574fb258 JC |
564 | case SCA3000_MEAS_MODE_NORMAL: |
565 | *base_freq = info->measurement_mode_freq; | |
566 | break; | |
567 | case SCA3000_MEAS_MODE_OP_1: | |
568 | *base_freq = info->option_mode_1_freq; | |
569 | break; | |
570 | case SCA3000_MEAS_MODE_OP_2: | |
571 | *base_freq = info->option_mode_2_freq; | |
572 | break; | |
c608cb01 | 573 | } |
574fb258 JC |
574 | error_ret: |
575 | return ret; | |
576 | } | |
577 | ||
578 | /** | |
579 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
580 | **/ | |
581 | static ssize_t sca3000_read_frequency(struct device *dev, | |
582 | struct device_attribute *attr, | |
583 | char *buf) | |
584 | { | |
4b522ce7 | 585 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 586 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
587 | int ret, len = 0, base_freq = 0, val; |
588 | ||
574fb258 JC |
589 | mutex_lock(&st->lock); |
590 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
591 | if (ret) | |
592 | goto error_ret_mut; | |
25888dc5 | 593 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
574fb258 JC |
594 | mutex_unlock(&st->lock); |
595 | if (ret) | |
596 | goto error_ret; | |
25888dc5 | 597 | val = ret; |
574fb258 | 598 | if (base_freq > 0) |
25888dc5 | 599 | switch (val & 0x03) { |
574fb258 JC |
600 | case 0x00: |
601 | case 0x03: | |
602 | len = sprintf(buf, "%d\n", base_freq); | |
603 | break; | |
604 | case 0x01: | |
605 | len = sprintf(buf, "%d\n", base_freq/2); | |
606 | break; | |
607 | case 0x02: | |
608 | len = sprintf(buf, "%d\n", base_freq/4); | |
609 | break; | |
c608cb01 | 610 | } |
25888dc5 | 611 | |
574fb258 JC |
612 | return len; |
613 | error_ret_mut: | |
614 | mutex_unlock(&st->lock); | |
615 | error_ret: | |
616 | return ret; | |
617 | } | |
618 | ||
619 | /** | |
620 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
621 | **/ | |
622 | static ssize_t sca3000_set_frequency(struct device *dev, | |
623 | struct device_attribute *attr, | |
624 | const char *buf, | |
625 | size_t len) | |
626 | { | |
4b522ce7 | 627 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 628 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 629 | int ret, base_freq = 0; |
25888dc5 | 630 | int ctrlval; |
e5e26dd5 | 631 | int val; |
574fb258 | 632 | |
e5e26dd5 | 633 | ret = kstrtoint(buf, 10, &val); |
574fb258 JC |
634 | if (ret) |
635 | return ret; | |
636 | ||
637 | mutex_lock(&st->lock); | |
638 | /* What mode are we in? */ | |
639 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
640 | if (ret) | |
641 | goto error_free_lock; | |
642 | ||
25888dc5 JC |
643 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
644 | if (ret < 0) | |
574fb258 | 645 | goto error_free_lock; |
25888dc5 | 646 | ctrlval = ret; |
574fb258 | 647 | /* clear the bits */ |
25888dc5 | 648 | ctrlval &= ~0x03; |
574fb258 JC |
649 | |
650 | if (val == base_freq/2) { | |
25888dc5 | 651 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2; |
574fb258 | 652 | } else if (val == base_freq/4) { |
25888dc5 | 653 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4; |
574fb258 JC |
654 | } else if (val != base_freq) { |
655 | ret = -EINVAL; | |
656 | goto error_free_lock; | |
657 | } | |
25888dc5 JC |
658 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, |
659 | ctrlval); | |
574fb258 JC |
660 | error_free_lock: |
661 | mutex_unlock(&st->lock); | |
662 | ||
663 | return ret ? ret : len; | |
664 | } | |
665 | ||
666 | /* Should only really be registered if ring buffer support is compiled in. | |
667 | * Does no harm however and doing it right would add a fair bit of complexity | |
668 | */ | |
f3fb0011 | 669 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq); |
574fb258 JC |
670 | |
671 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
672 | sca3000_read_frequency, | |
673 | sca3000_set_frequency); | |
674 | ||
675 | ||
676 | /** | |
677 | * sca3000_read_temp() sysfs interface to get the temperature when available | |
678 | * | |
679 | * The alignment of data in here is downright odd. See data sheet. | |
680 | * Converting this into a meaningful value is left to inline functions in | |
681 | * userspace part of header. | |
682 | **/ | |
683 | static ssize_t sca3000_read_temp(struct device *dev, | |
684 | struct device_attribute *attr, | |
685 | char *buf) | |
686 | { | |
4b522ce7 | 687 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 688 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 689 | int ret; |
574fb258 | 690 | int val; |
25888dc5 | 691 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2); |
574fb258 JC |
692 | if (ret < 0) |
693 | goto error_ret; | |
25888dc5 | 694 | val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5); |
574fb258 | 695 | |
25888dc5 | 696 | return sprintf(buf, "%d\n", val); |
574fb258 JC |
697 | |
698 | error_ret: | |
699 | return ret; | |
700 | } | |
f3fb0011 JC |
701 | static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp); |
702 | ||
51a0a5b0 MS |
703 | static IIO_CONST_ATTR_TEMP_SCALE("0.555556"); |
704 | static IIO_CONST_ATTR_TEMP_OFFSET("-214.6"); | |
574fb258 JC |
705 | |
706 | /** | |
25888dc5 | 707 | * sca3000_read_thresh() - query of a threshold |
574fb258 | 708 | **/ |
25888dc5 | 709 | static int sca3000_read_thresh(struct iio_dev *indio_dev, |
129c3f61 LPC |
710 | const struct iio_chan_spec *chan, |
711 | enum iio_event_type type, | |
712 | enum iio_event_direction dir, | |
713 | enum iio_event_info info, | |
714 | int *val, int *val2) | |
574fb258 | 715 | { |
25888dc5 | 716 | int ret, i; |
83f0422d | 717 | struct sca3000_state *st = iio_priv(indio_dev); |
129c3f61 | 718 | int num = chan->channel2; |
574fb258 | 719 | mutex_lock(&st->lock); |
25888dc5 | 720 | ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]); |
574fb258 | 721 | mutex_unlock(&st->lock); |
25888dc5 | 722 | if (ret < 0) |
574fb258 | 723 | return ret; |
25888dc5 JC |
724 | *val = 0; |
725 | if (num == 1) | |
726 | for_each_set_bit(i, (unsigned long *)&ret, | |
727 | ARRAY_SIZE(st->info->mot_det_mult_y)) | |
728 | *val += st->info->mot_det_mult_y[i]; | |
729 | else | |
730 | for_each_set_bit(i, (unsigned long *)&ret, | |
731 | ARRAY_SIZE(st->info->mot_det_mult_xz)) | |
732 | *val += st->info->mot_det_mult_xz[i]; | |
574fb258 | 733 | |
129c3f61 | 734 | return IIO_VAL_INT; |
574fb258 JC |
735 | } |
736 | ||
737 | /** | |
25888dc5 | 738 | * sca3000_write_thresh() control of threshold |
574fb258 | 739 | **/ |
25888dc5 | 740 | static int sca3000_write_thresh(struct iio_dev *indio_dev, |
129c3f61 LPC |
741 | const struct iio_chan_spec *chan, |
742 | enum iio_event_type type, | |
743 | enum iio_event_direction dir, | |
744 | enum iio_event_info info, | |
745 | int val, int val2) | |
574fb258 | 746 | { |
83f0422d | 747 | struct sca3000_state *st = iio_priv(indio_dev); |
129c3f61 | 748 | int num = chan->channel2; |
574fb258 | 749 | int ret; |
25888dc5 JC |
750 | int i; |
751 | u8 nonlinear = 0; | |
752 | ||
753 | if (num == 1) { | |
754 | i = ARRAY_SIZE(st->info->mot_det_mult_y); | |
755 | while (i > 0) | |
756 | if (val >= st->info->mot_det_mult_y[--i]) { | |
757 | nonlinear |= (1 << i); | |
758 | val -= st->info->mot_det_mult_y[i]; | |
759 | } | |
760 | } else { | |
761 | i = ARRAY_SIZE(st->info->mot_det_mult_xz); | |
762 | while (i > 0) | |
763 | if (val >= st->info->mot_det_mult_xz[--i]) { | |
764 | nonlinear |= (1 << i); | |
765 | val -= st->info->mot_det_mult_xz[i]; | |
766 | } | |
767 | } | |
574fb258 | 768 | |
574fb258 | 769 | mutex_lock(&st->lock); |
25888dc5 | 770 | ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear); |
574fb258 JC |
771 | mutex_unlock(&st->lock); |
772 | ||
25888dc5 | 773 | return ret; |
574fb258 JC |
774 | } |
775 | ||
574fb258 | 776 | static struct attribute *sca3000_attributes[] = { |
574fb258 | 777 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 778 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 779 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 780 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
781 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
782 | NULL, | |
783 | }; | |
784 | ||
785 | static struct attribute *sca3000_attributes_with_temp[] = { | |
574fb258 | 786 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 787 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 788 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 789 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
790 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
791 | /* Only present if temp sensor is */ | |
322c9563 JC |
792 | &iio_dev_attr_in_temp_raw.dev_attr.attr, |
793 | &iio_const_attr_in_temp_offset.dev_attr.attr, | |
794 | &iio_const_attr_in_temp_scale.dev_attr.attr, | |
574fb258 JC |
795 | NULL, |
796 | }; | |
797 | ||
798 | static const struct attribute_group sca3000_attribute_group = { | |
799 | .attrs = sca3000_attributes, | |
800 | }; | |
801 | ||
802 | static const struct attribute_group sca3000_attribute_group_with_temp = { | |
803 | .attrs = sca3000_attributes_with_temp, | |
804 | }; | |
805 | ||
806 | /* RING RELATED interrupt handler */ | |
807 | /* depending on event, push to the ring buffer event chrdev or the event one */ | |
808 | ||
809 | /** | |
25888dc5 | 810 | * sca3000_event_handler() - handling ring and non ring events |
574fb258 JC |
811 | * |
812 | * This function is complicated by the fact that the devices can signify ring | |
813 | * and non ring events via the same interrupt line and they can only | |
814 | * be distinguished via a read of the relevant status register. | |
815 | **/ | |
25888dc5 | 816 | static irqreturn_t sca3000_event_handler(int irq, void *private) |
574fb258 | 817 | { |
25888dc5 | 818 | struct iio_dev *indio_dev = private; |
83f0422d | 819 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
820 | int ret, val; |
821 | s64 last_timestamp = iio_get_time_ns(); | |
574fb258 JC |
822 | |
823 | /* Could lead if badly timed to an extra read of status reg, | |
824 | * but ensures no interrupt is missed. | |
825 | */ | |
574fb258 | 826 | mutex_lock(&st->lock); |
25888dc5 JC |
827 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
828 | val = st->rx[0]; | |
574fb258 JC |
829 | mutex_unlock(&st->lock); |
830 | if (ret) | |
831 | goto done; | |
832 | ||
14555b14 | 833 | sca3000_ring_int_process(val, indio_dev->buffer); |
574fb258 | 834 | |
25888dc5 | 835 | if (val & SCA3000_INT_STATUS_FREE_FALL) |
5aa96188 | 836 | iio_push_event(indio_dev, |
c4b14d99 | 837 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 838 | 0, |
c4b14d99 | 839 | IIO_MOD_X_AND_Y_AND_Z, |
de9fe32a JC |
840 | IIO_EV_TYPE_MAG, |
841 | IIO_EV_DIR_FALLING), | |
25888dc5 | 842 | last_timestamp); |
574fb258 | 843 | |
25888dc5 | 844 | if (val & SCA3000_INT_STATUS_Y_TRIGGER) |
5aa96188 | 845 | iio_push_event(indio_dev, |
c4b14d99 | 846 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 847 | 0, |
c4b14d99 | 848 | IIO_MOD_Y, |
de9fe32a JC |
849 | IIO_EV_TYPE_MAG, |
850 | IIO_EV_DIR_RISING), | |
25888dc5 | 851 | last_timestamp); |
574fb258 | 852 | |
25888dc5 | 853 | if (val & SCA3000_INT_STATUS_X_TRIGGER) |
5aa96188 | 854 | iio_push_event(indio_dev, |
c4b14d99 | 855 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 856 | 0, |
c4b14d99 | 857 | IIO_MOD_X, |
de9fe32a JC |
858 | IIO_EV_TYPE_MAG, |
859 | IIO_EV_DIR_RISING), | |
25888dc5 | 860 | last_timestamp); |
574fb258 | 861 | |
25888dc5 | 862 | if (val & SCA3000_INT_STATUS_Z_TRIGGER) |
5aa96188 | 863 | iio_push_event(indio_dev, |
c4b14d99 | 864 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 865 | 0, |
c4b14d99 | 866 | IIO_MOD_Z, |
de9fe32a JC |
867 | IIO_EV_TYPE_MAG, |
868 | IIO_EV_DIR_RISING), | |
25888dc5 | 869 | last_timestamp); |
574fb258 JC |
870 | |
871 | done: | |
25888dc5 | 872 | return IRQ_HANDLED; |
574fb258 JC |
873 | } |
874 | ||
875 | /** | |
25888dc5 | 876 | * sca3000_read_event_config() what events are enabled |
574fb258 | 877 | **/ |
25888dc5 | 878 | static int sca3000_read_event_config(struct iio_dev *indio_dev, |
129c3f61 LPC |
879 | const struct iio_chan_spec *chan, |
880 | enum iio_event_type type, | |
881 | enum iio_event_direction dir) | |
574fb258 | 882 | { |
83f0422d | 883 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 884 | int ret; |
574fb258 | 885 | u8 protect_mask = 0x03; |
129c3f61 | 886 | int num = chan->channel2; |
574fb258 JC |
887 | |
888 | /* read current value of mode register */ | |
889 | mutex_lock(&st->lock); | |
25888dc5 | 890 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
891 | if (ret) |
892 | goto error_ret; | |
893 | ||
25888dc5 JC |
894 | if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) |
895 | ret = 0; | |
574fb258 | 896 | else { |
25888dc5 JC |
897 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
898 | if (ret < 0) | |
574fb258 JC |
899 | goto error_ret; |
900 | /* only supporting logical or's for now */ | |
25888dc5 | 901 | ret = !!(ret & sca3000_addresses[num][2]); |
574fb258 | 902 | } |
574fb258 JC |
903 | error_ret: |
904 | mutex_unlock(&st->lock); | |
905 | ||
25888dc5 | 906 | return ret; |
574fb258 JC |
907 | } |
908 | /** | |
909 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
910 | **/ | |
911 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
912 | struct device_attribute *attr, | |
913 | char *buf) | |
914 | { | |
915 | int ret, len; | |
4b522ce7 | 916 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 917 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 918 | int val; |
574fb258 JC |
919 | |
920 | mutex_lock(&st->lock); | |
25888dc5 JC |
921 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
922 | val = st->rx[0]; | |
574fb258 | 923 | mutex_unlock(&st->lock); |
25888dc5 | 924 | if (ret < 0) |
574fb258 JC |
925 | return ret; |
926 | len = sprintf(buf, "%d\n", | |
25888dc5 | 927 | !!(val & SCA3000_FREE_FALL_DETECT)); |
574fb258 JC |
928 | return len; |
929 | } | |
574fb258 JC |
930 | |
931 | /** | |
932 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
933 | * | |
934 | * In these chips the free fall detector should send an interrupt if | |
935 | * the device falls more than 25cm. This has not been tested due | |
936 | * to fragile wiring. | |
937 | **/ | |
938 | ||
939 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, | |
940 | struct device_attribute *attr, | |
941 | const char *buf, | |
942 | size_t len) | |
943 | { | |
4b522ce7 | 944 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
83f0422d | 945 | struct sca3000_state *st = iio_priv(indio_dev); |
e5e26dd5 | 946 | u8 val; |
574fb258 | 947 | int ret; |
574fb258 JC |
948 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; |
949 | ||
950 | mutex_lock(&st->lock); | |
e5e26dd5 | 951 | ret = kstrtou8(buf, 10, &val); |
574fb258 JC |
952 | if (ret) |
953 | goto error_ret; | |
954 | ||
955 | /* read current value of mode register */ | |
25888dc5 | 956 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
957 | if (ret) |
958 | goto error_ret; | |
959 | ||
960 | /*if off and should be on*/ | |
25888dc5 | 961 | if (val && !(st->rx[0] & protect_mask)) |
574fb258 | 962 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 963 | (st->rx[0] | SCA3000_FREE_FALL_DETECT)); |
574fb258 | 964 | /* if on and should be off */ |
25888dc5 | 965 | else if (!val && (st->rx[0] & protect_mask)) |
574fb258 | 966 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 967 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
968 | error_ret: |
969 | mutex_unlock(&st->lock); | |
970 | ||
971 | return ret ? ret : len; | |
972 | } | |
973 | ||
974 | /** | |
975 | * sca3000_set_mo_det() simple on off control for motion detector | |
976 | * | |
977 | * This is a per axis control, but enabling any will result in the | |
978 | * motion detector unit being enabled. | |
979 | * N.B. enabling motion detector stops normal data acquisition. | |
980 | * There is a complexity in knowing which mode to return to when | |
981 | * this mode is disabled. Currently normal mode is assumed. | |
982 | **/ | |
25888dc5 | 983 | static int sca3000_write_event_config(struct iio_dev *indio_dev, |
129c3f61 LPC |
984 | const struct iio_chan_spec *chan, |
985 | enum iio_event_type type, | |
986 | enum iio_event_direction dir, | |
25888dc5 | 987 | int state) |
574fb258 | 988 | { |
83f0422d | 989 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 990 | int ret, ctrlval; |
574fb258 | 991 | u8 protect_mask = 0x03; |
129c3f61 | 992 | int num = chan->channel2; |
574fb258 JC |
993 | |
994 | mutex_lock(&st->lock); | |
995 | /* First read the motion detector config to find out if | |
996 | * this axis is on*/ | |
25888dc5 JC |
997 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
998 | if (ret < 0) | |
574fb258 | 999 | goto exit_point; |
25888dc5 | 1000 | ctrlval = ret; |
574fb258 | 1001 | /* Off and should be on */ |
25888dc5 | 1002 | if (state && !(ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
1003 | ret = sca3000_write_ctrl_reg(st, |
1004 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
1005 | ctrlval | |
1006 | sca3000_addresses[num][2]); | |
574fb258 | 1007 | if (ret) |
25888dc5 | 1008 | goto exit_point; |
574fb258 | 1009 | st->mo_det_use_count++; |
25888dc5 | 1010 | } else if (!state && (ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
1011 | ret = sca3000_write_ctrl_reg(st, |
1012 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
1013 | ctrlval & |
1014 | ~(sca3000_addresses[num][2])); | |
574fb258 | 1015 | if (ret) |
25888dc5 | 1016 | goto exit_point; |
574fb258 | 1017 | st->mo_det_use_count--; |
25888dc5 JC |
1018 | } |
1019 | ||
574fb258 | 1020 | /* read current value of mode register */ |
25888dc5 | 1021 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1022 | if (ret) |
1023 | goto exit_point; | |
1024 | /*if off and should be on*/ | |
1025 | if ((st->mo_det_use_count) | |
25888dc5 | 1026 | && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1027 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1028 | (st->rx[0] & ~protect_mask) |
574fb258 JC |
1029 | | SCA3000_MEAS_MODE_MOT_DET); |
1030 | /* if on and should be off */ | |
1031 | else if (!(st->mo_det_use_count) | |
25888dc5 | 1032 | && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1033 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1034 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
1035 | exit_point: |
1036 | mutex_unlock(&st->lock); | |
1037 | ||
25888dc5 | 1038 | return ret; |
574fb258 JC |
1039 | } |
1040 | ||
574fb258 | 1041 | /* Free fall detector related event attribute */ |
aaf370db | 1042 | static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, |
322c9563 | 1043 | in_accel_x&y&z_mag_falling_en, |
aaf370db JC |
1044 | S_IRUGO | S_IWUSR, |
1045 | sca3000_query_free_fall_mode, | |
1046 | sca3000_set_free_fall_mode, | |
1047 | 0); | |
fc5d0e42 | 1048 | |
25888dc5 | 1049 | static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period, |
322c9563 | 1050 | in_accel_x&y&z_mag_falling_period, |
25888dc5 | 1051 | "0.226"); |
574fb258 JC |
1052 | |
1053 | static struct attribute *sca3000_event_attributes[] = { | |
aaf370db | 1054 | &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr, |
fc5d0e42 | 1055 | &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr, |
574fb258 JC |
1056 | NULL, |
1057 | }; | |
1058 | ||
1059 | static struct attribute_group sca3000_event_attribute_group = { | |
1060 | .attrs = sca3000_event_attributes, | |
8e7d9672 | 1061 | .name = "events", |
574fb258 JC |
1062 | }; |
1063 | ||
1064 | /** | |
1065 | * sca3000_clean_setup() get the device into a predictable state | |
1066 | * | |
1067 | * Devices use flash memory to store many of the register values | |
1068 | * and hence can come up in somewhat unpredictable states. | |
1069 | * Hence reset everything on driver load. | |
1070 | **/ | |
1071 | static int sca3000_clean_setup(struct sca3000_state *st) | |
1072 | { | |
1073 | int ret; | |
574fb258 JC |
1074 | |
1075 | mutex_lock(&st->lock); | |
1076 | /* Ensure all interrupts have been acknowledged */ | |
25888dc5 | 1077 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
574fb258 JC |
1078 | if (ret) |
1079 | goto error_ret; | |
574fb258 JC |
1080 | |
1081 | /* Turn off all motion detection channels */ | |
25888dc5 JC |
1082 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
1083 | if (ret < 0) | |
574fb258 | 1084 | goto error_ret; |
25888dc5 JC |
1085 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL, |
1086 | ret & SCA3000_MD_CTRL_PROT_MASK); | |
574fb258 JC |
1087 | if (ret) |
1088 | goto error_ret; | |
1089 | ||
1090 | /* Disable ring buffer */ | |
25888dc5 JC |
1091 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
1092 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1093 | (ret & SCA3000_OUT_CTRL_PROT_MASK) | |
574fb258 JC |
1094 | | SCA3000_OUT_CTRL_BUF_X_EN |
1095 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1096 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1097 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
574fb258 JC |
1098 | if (ret) |
1099 | goto error_ret; | |
1100 | /* Enable interrupts, relevant to mode and set up as active low */ | |
25888dc5 | 1101 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1102 | if (ret) |
1103 | goto error_ret; | |
1104 | ret = sca3000_write_reg(st, | |
1105 | SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 | 1106 | (ret & SCA3000_INT_MASK_PROT_MASK) |
574fb258 | 1107 | | SCA3000_INT_MASK_ACTIVE_LOW); |
574fb258 JC |
1108 | if (ret) |
1109 | goto error_ret; | |
1110 | /* Select normal measurement mode, free fall off, ring off */ | |
1111 | /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1112 | * as that occurs in one of the example on the datasheet */ | |
25888dc5 | 1113 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1114 | if (ret) |
1115 | goto error_ret; | |
25888dc5 JC |
1116 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
1117 | (st->rx[0] & SCA3000_MODE_PROT_MASK)); | |
574fb258 JC |
1118 | st->bpse = 11; |
1119 | ||
1120 | error_ret: | |
1121 | mutex_unlock(&st->lock); | |
1122 | return ret; | |
1123 | } | |
1124 | ||
6fe8135f JC |
1125 | static const struct iio_info sca3000_info = { |
1126 | .attrs = &sca3000_attribute_group, | |
1127 | .read_raw = &sca3000_read_raw, | |
6fe8135f | 1128 | .event_attrs = &sca3000_event_attribute_group, |
129c3f61 LPC |
1129 | .read_event_value_new = &sca3000_read_thresh, |
1130 | .write_event_value_new = &sca3000_write_thresh, | |
1131 | .read_event_config_new = &sca3000_read_event_config, | |
1132 | .write_event_config_new = &sca3000_write_event_config, | |
6fe8135f JC |
1133 | .driver_module = THIS_MODULE, |
1134 | }; | |
1135 | ||
1136 | static const struct iio_info sca3000_info_with_temp = { | |
1137 | .attrs = &sca3000_attribute_group_with_temp, | |
1138 | .read_raw = &sca3000_read_raw, | |
129c3f61 LPC |
1139 | .read_event_value_new = &sca3000_read_thresh, |
1140 | .write_event_value_new = &sca3000_write_thresh, | |
1141 | .read_event_config_new = &sca3000_read_event_config, | |
1142 | .write_event_config_new = &sca3000_write_event_config, | |
6fe8135f JC |
1143 | .driver_module = THIS_MODULE, |
1144 | }; | |
1145 | ||
4ae1c61f | 1146 | static int sca3000_probe(struct spi_device *spi) |
574fb258 | 1147 | { |
d2fffd6c | 1148 | int ret; |
574fb258 | 1149 | struct sca3000_state *st; |
83f0422d | 1150 | struct iio_dev *indio_dev; |
574fb258 | 1151 | |
0189d93f SK |
1152 | indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
1153 | if (!indio_dev) | |
1154 | return -ENOMEM; | |
574fb258 | 1155 | |
03bda05d | 1156 | st = iio_priv(indio_dev); |
83f0422d | 1157 | spi_set_drvdata(spi, indio_dev); |
574fb258 JC |
1158 | st->us = spi; |
1159 | mutex_init(&st->lock); | |
25888dc5 JC |
1160 | st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi) |
1161 | ->driver_data]; | |
574fb258 | 1162 | |
83f0422d JC |
1163 | indio_dev->dev.parent = &spi->dev; |
1164 | indio_dev->name = spi_get_device_id(spi)->name; | |
574fb258 | 1165 | if (st->info->temp_output) |
83f0422d | 1166 | indio_dev->info = &sca3000_info_with_temp; |
25888dc5 | 1167 | else { |
83f0422d JC |
1168 | indio_dev->info = &sca3000_info; |
1169 | indio_dev->channels = sca3000_channels; | |
1170 | indio_dev->num_channels = ARRAY_SIZE(sca3000_channels); | |
25888dc5 | 1171 | } |
83f0422d | 1172 | indio_dev->modes = INDIO_DIRECT_MODE; |
574fb258 | 1173 | |
83f0422d JC |
1174 | sca3000_configure_ring(indio_dev); |
1175 | ret = iio_device_register(indio_dev); | |
574fb258 | 1176 | if (ret < 0) |
0189d93f | 1177 | return ret; |
d2fffd6c | 1178 | |
14555b14 JC |
1179 | ret = iio_buffer_register(indio_dev, |
1180 | sca3000_channels, | |
1181 | ARRAY_SIZE(sca3000_channels)); | |
574fb258 JC |
1182 | if (ret < 0) |
1183 | goto error_unregister_dev; | |
14555b14 | 1184 | if (indio_dev->buffer) { |
f79a9098 JC |
1185 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 0); |
1186 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 1); | |
1187 | iio_scan_mask_set(indio_dev, indio_dev->buffer, 2); | |
bd94c6a8 JC |
1188 | } |
1189 | ||
3e2c96ea | 1190 | if (spi->irq) { |
25888dc5 JC |
1191 | ret = request_threaded_irq(spi->irq, |
1192 | NULL, | |
1193 | &sca3000_event_handler, | |
a91aff1c | 1194 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
25888dc5 | 1195 | "sca3000", |
83f0422d | 1196 | indio_dev); |
574fb258 JC |
1197 | if (ret) |
1198 | goto error_unregister_ring; | |
574fb258 | 1199 | } |
83f0422d | 1200 | sca3000_register_ring_funcs(indio_dev); |
574fb258 JC |
1201 | ret = sca3000_clean_setup(st); |
1202 | if (ret) | |
25888dc5 | 1203 | goto error_free_irq; |
574fb258 JC |
1204 | return 0; |
1205 | ||
25888dc5 | 1206 | error_free_irq: |
3e2c96ea | 1207 | if (spi->irq) |
83f0422d | 1208 | free_irq(spi->irq, indio_dev); |
574fb258 | 1209 | error_unregister_ring: |
14555b14 | 1210 | iio_buffer_unregister(indio_dev); |
574fb258 | 1211 | error_unregister_dev: |
d2fffd6c | 1212 | iio_device_unregister(indio_dev); |
574fb258 JC |
1213 | return ret; |
1214 | } | |
1215 | ||
1216 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1217 | { | |
1218 | int ret; | |
574fb258 JC |
1219 | |
1220 | mutex_lock(&st->lock); | |
25888dc5 | 1221 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1222 | if (ret) |
1223 | goto error_ret; | |
1224 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 JC |
1225 | (st->rx[0] & |
1226 | ~(SCA3000_INT_MASK_RING_THREE_QUARTER | | |
1227 | SCA3000_INT_MASK_RING_HALF | | |
1228 | SCA3000_INT_MASK_ALL_INTS))); | |
574fb258 | 1229 | error_ret: |
25888dc5 | 1230 | mutex_unlock(&st->lock); |
574fb258 | 1231 | return ret; |
574fb258 JC |
1232 | } |
1233 | ||
447d4f29 | 1234 | static int sca3000_remove(struct spi_device *spi) |
574fb258 | 1235 | { |
83f0422d JC |
1236 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
1237 | struct sca3000_state *st = iio_priv(indio_dev); | |
67ad4e08 | 1238 | |
574fb258 | 1239 | /* Must ensure no interrupts can be generated after this!*/ |
67ad4e08 | 1240 | sca3000_stop_all_interrupts(st); |
3e2c96ea | 1241 | if (spi->irq) |
25888dc5 | 1242 | free_irq(spi->irq, indio_dev); |
d2fffd6c | 1243 | iio_device_unregister(indio_dev); |
14555b14 | 1244 | iio_buffer_unregister(indio_dev); |
574fb258 | 1245 | sca3000_unconfigure_ring(indio_dev); |
574fb258 | 1246 | |
574fb258 JC |
1247 | return 0; |
1248 | } | |
1249 | ||
25888dc5 JC |
1250 | static const struct spi_device_id sca3000_id[] = { |
1251 | {"sca3000_d01", d01}, | |
1252 | {"sca3000_e02", e02}, | |
1253 | {"sca3000_e04", e04}, | |
1254 | {"sca3000_e05", e05}, | |
1255 | {} | |
1256 | }; | |
55e4390c | 1257 | MODULE_DEVICE_TABLE(spi, sca3000_id); |
574fb258 | 1258 | |
25888dc5 JC |
1259 | static struct spi_driver sca3000_driver = { |
1260 | .driver = { | |
1261 | .name = "sca3000", | |
1262 | .owner = THIS_MODULE, | |
1263 | }, | |
1264 | .probe = sca3000_probe, | |
e543acf0 | 1265 | .remove = sca3000_remove, |
25888dc5 JC |
1266 | .id_table = sca3000_id, |
1267 | }; | |
ae6ae6fe | 1268 | module_spi_driver(sca3000_driver); |
574fb258 | 1269 | |
0f8c9620 | 1270 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
574fb258 JC |
1271 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); |
1272 | MODULE_LICENSE("GPL v2"); |