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574fb258 JC |
1 | /* |
2 | * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
8 | * Copyright (c) 2009 Jonathan Cameron <jic23@cam.ac.uk> | |
9 | * | |
10 | * See industrialio/accels/sca3000.h for comments. | |
11 | */ | |
12 | ||
13 | #include <linux/interrupt.h> | |
14 | #include <linux/gpio.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/device.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
574fb258 JC |
18 | #include <linux/kernel.h> |
19 | #include <linux/spi/spi.h> | |
20 | #include <linux/sysfs.h> | |
21 | #include "../iio.h" | |
22 | #include "../sysfs.h" | |
23 | #include "../ring_generic.h" | |
24 | ||
574fb258 JC |
25 | #include "sca3000.h" |
26 | ||
27 | enum sca3000_variant { | |
28 | d01, | |
574fb258 JC |
29 | e02, |
30 | e04, | |
31 | e05, | |
574fb258 JC |
32 | }; |
33 | ||
34 | /* Note where option modes are not defined, the chip simply does not | |
35 | * support any. | |
36 | * Other chips in the sca3000 series use i2c and are not included here. | |
37 | * | |
38 | * Some of these devices are only listed in the family data sheet and | |
39 | * do not actually appear to be available. | |
40 | */ | |
41 | static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = { | |
845bd12a | 42 | [d01] = { |
25888dc5 | 43 | .scale = 7357, |
574fb258 JC |
44 | .temp_output = true, |
45 | .measurement_mode_freq = 250, | |
46 | .option_mode_1 = SCA3000_OP_MODE_BYPASS, | |
47 | .option_mode_1_freq = 250, | |
25888dc5 JC |
48 | .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300}, |
49 | .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750}, | |
845bd12a JC |
50 | }, |
51 | [e02] = { | |
25888dc5 | 52 | .scale = 9810, |
574fb258 JC |
53 | .measurement_mode_freq = 125, |
54 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
55 | .option_mode_1_freq = 63, | |
25888dc5 JC |
56 | .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050}, |
57 | .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700}, | |
845bd12a JC |
58 | }, |
59 | [e04] = { | |
25888dc5 | 60 | .scale = 19620, |
574fb258 JC |
61 | .measurement_mode_freq = 100, |
62 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
63 | .option_mode_1_freq = 50, | |
64 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
65 | .option_mode_2_freq = 400, | |
25888dc5 JC |
66 | .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100}, |
67 | .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000}, | |
845bd12a JC |
68 | }, |
69 | [e05] = { | |
25888dc5 | 70 | .scale = 61313, |
574fb258 JC |
71 | .measurement_mode_freq = 200, |
72 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
73 | .option_mode_1_freq = 50, | |
74 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
75 | .option_mode_2_freq = 400, | |
25888dc5 JC |
76 | .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900}, |
77 | .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600}, | |
574fb258 JC |
78 | }, |
79 | }; | |
80 | ||
574fb258 JC |
81 | int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val) |
82 | { | |
574fb258 JC |
83 | st->tx[0] = SCA3000_WRITE_REG(address); |
84 | st->tx[1] = val; | |
25888dc5 | 85 | return spi_write(st->us, st->tx, 2); |
574fb258 JC |
86 | } |
87 | ||
25888dc5 JC |
88 | int sca3000_read_data_short(struct sca3000_state *st, |
89 | uint8_t reg_address_high, | |
90 | int len) | |
574fb258 | 91 | { |
574fb258 | 92 | struct spi_message msg; |
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 JC |
102 | st->tx[0] = SCA3000_READ_REG(reg_address_high); |
103 | spi_message_init(&msg); | |
25888dc5 JC |
104 | spi_message_add_tail(&xfer[0], &msg); |
105 | spi_message_add_tail(&xfer[1], &msg); | |
574fb258 | 106 | |
25888dc5 | 107 | return spi_sync(st->us, &msg); |
574fb258 | 108 | } |
25888dc5 | 109 | |
574fb258 JC |
110 | /** |
111 | * sca3000_reg_lock_on() test if the ctrl register lock is on | |
112 | * | |
113 | * Lock must be held. | |
114 | **/ | |
115 | static int sca3000_reg_lock_on(struct sca3000_state *st) | |
116 | { | |
574fb258 JC |
117 | int ret; |
118 | ||
25888dc5 | 119 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
120 | if (ret < 0) |
121 | return ret; | |
574fb258 | 122 | |
25888dc5 | 123 | return !(st->rx[0] & SCA3000_LOCKED); |
574fb258 JC |
124 | } |
125 | ||
126 | /** | |
127 | * __sca3000_unlock_reg_lock() unlock the control registers | |
128 | * | |
129 | * Note the device does not appear to support doing this in a single transfer. | |
130 | * This should only ever be used as part of ctrl reg read. | |
131 | * Lock must be held before calling this | |
132 | **/ | |
133 | static int __sca3000_unlock_reg_lock(struct sca3000_state *st) | |
134 | { | |
135 | struct spi_message msg; | |
136 | struct spi_transfer xfer[3] = { | |
137 | { | |
574fb258 JC |
138 | .len = 2, |
139 | .cs_change = 1, | |
140 | .tx_buf = st->tx, | |
141 | }, { | |
574fb258 JC |
142 | .len = 2, |
143 | .cs_change = 1, | |
144 | .tx_buf = st->tx + 2, | |
145 | }, { | |
574fb258 | 146 | .len = 2, |
574fb258 JC |
147 | .tx_buf = st->tx + 4, |
148 | }, | |
149 | }; | |
150 | st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
151 | st->tx[1] = 0x00; | |
152 | st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
153 | st->tx[3] = 0x50; | |
154 | st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
155 | st->tx[5] = 0xA0; | |
156 | spi_message_init(&msg); | |
157 | spi_message_add_tail(&xfer[0], &msg); | |
158 | spi_message_add_tail(&xfer[1], &msg); | |
159 | spi_message_add_tail(&xfer[2], &msg); | |
160 | ||
161 | return spi_sync(st->us, &msg); | |
162 | } | |
163 | ||
164 | /** | |
165 | * sca3000_write_ctrl_reg() write to a lock protect ctrl register | |
166 | * @sel: selects which registers we wish to write to | |
167 | * @val: the value to be written | |
168 | * | |
169 | * Certain control registers are protected against overwriting by the lock | |
170 | * register and use a shared write address. This function allows writing of | |
171 | * these registers. | |
172 | * Lock must be held. | |
173 | **/ | |
174 | static int sca3000_write_ctrl_reg(struct sca3000_state *st, | |
175 | uint8_t sel, | |
176 | uint8_t val) | |
177 | { | |
178 | ||
179 | int ret; | |
180 | ||
181 | ret = sca3000_reg_lock_on(st); | |
182 | if (ret < 0) | |
183 | goto error_ret; | |
184 | if (ret) { | |
185 | ret = __sca3000_unlock_reg_lock(st); | |
186 | if (ret) | |
187 | goto error_ret; | |
188 | } | |
189 | ||
190 | /* Set the control select register */ | |
191 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel); | |
192 | if (ret) | |
193 | goto error_ret; | |
194 | ||
195 | /* Write the actual value into the register */ | |
196 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val); | |
197 | ||
198 | error_ret: | |
199 | return ret; | |
200 | } | |
201 | ||
202 | /* Crucial that lock is called before calling this */ | |
203 | /** | |
204 | * sca3000_read_ctrl_reg() read from lock protected control register. | |
205 | * | |
206 | * Lock must be held. | |
207 | **/ | |
208 | static int sca3000_read_ctrl_reg(struct sca3000_state *st, | |
25888dc5 | 209 | u8 ctrl_reg) |
574fb258 JC |
210 | { |
211 | int ret; | |
212 | ||
213 | ret = sca3000_reg_lock_on(st); | |
214 | if (ret < 0) | |
215 | goto error_ret; | |
216 | if (ret) { | |
217 | ret = __sca3000_unlock_reg_lock(st); | |
218 | if (ret) | |
219 | goto error_ret; | |
220 | } | |
221 | /* Set the control select register */ | |
222 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg); | |
223 | if (ret) | |
224 | goto error_ret; | |
25888dc5 JC |
225 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1); |
226 | if (ret) | |
227 | goto error_ret; | |
228 | else | |
229 | return st->rx[0]; | |
574fb258 JC |
230 | error_ret: |
231 | return ret; | |
232 | } | |
233 | ||
234 | #ifdef SCA3000_DEBUG | |
235 | /** | |
236 | * sca3000_check_status() check the status register | |
237 | * | |
238 | * Only used for debugging purposes | |
239 | **/ | |
240 | static int sca3000_check_status(struct device *dev) | |
241 | { | |
574fb258 JC |
242 | int ret; |
243 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
83f0422d | 244 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
245 | |
246 | mutex_lock(&st->lock); | |
25888dc5 | 247 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
248 | if (ret < 0) |
249 | goto error_ret; | |
25888dc5 | 250 | if (st->rx[0] & SCA3000_EEPROM_CS_ERROR) |
26de7208 | 251 | dev_err(dev, "eeprom error\n"); |
25888dc5 | 252 | if (st->rx[0] & SCA3000_SPI_FRAME_ERROR) |
574fb258 | 253 | dev_err(dev, "Previous SPI Frame was corrupt\n"); |
574fb258 JC |
254 | |
255 | error_ret: | |
256 | mutex_unlock(&st->lock); | |
257 | return ret; | |
258 | } | |
259 | #endif /* SCA3000_DEBUG */ | |
260 | ||
845bd12a | 261 | |
574fb258 JC |
262 | /** |
263 | * sca3000_show_reg() - sysfs interface to read the chip revision number | |
264 | **/ | |
265 | static ssize_t sca3000_show_rev(struct device *dev, | |
266 | struct device_attribute *attr, | |
267 | char *buf) | |
268 | { | |
269 | int len = 0, ret; | |
270 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
83f0422d | 271 | struct sca3000_state *st = iio_priv(dev_info); |
574fb258 | 272 | |
574fb258 | 273 | mutex_lock(&st->lock); |
25888dc5 | 274 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1); |
574fb258 JC |
275 | if (ret < 0) |
276 | goto error_ret; | |
277 | len += sprintf(buf + len, | |
278 | "major=%d, minor=%d\n", | |
25888dc5 JC |
279 | st->rx[0] & SCA3000_REVID_MAJOR_MASK, |
280 | st->rx[0] & SCA3000_REVID_MINOR_MASK); | |
574fb258 JC |
281 | error_ret: |
282 | mutex_unlock(&st->lock); | |
283 | ||
284 | return ret ? ret : len; | |
285 | } | |
286 | ||
287 | /** | |
288 | * sca3000_show_available_measurement_modes() display available modes | |
289 | * | |
290 | * This is all read from chip specific data in the driver. Not all | |
291 | * of the sca3000 series support modes other than normal. | |
292 | **/ | |
293 | static ssize_t | |
294 | sca3000_show_available_measurement_modes(struct device *dev, | |
295 | struct device_attribute *attr, | |
296 | char *buf) | |
297 | { | |
298 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
83f0422d | 299 | struct sca3000_state *st = iio_priv(dev_info); |
574fb258 JC |
300 | int len = 0; |
301 | ||
302 | len += sprintf(buf + len, "0 - normal mode"); | |
303 | switch (st->info->option_mode_1) { | |
304 | case SCA3000_OP_MODE_NARROW: | |
305 | len += sprintf(buf + len, ", 1 - narrow mode"); | |
306 | break; | |
307 | case SCA3000_OP_MODE_BYPASS: | |
308 | len += sprintf(buf + len, ", 1 - bypass mode"); | |
309 | break; | |
c608cb01 | 310 | } |
574fb258 JC |
311 | switch (st->info->option_mode_2) { |
312 | case SCA3000_OP_MODE_WIDE: | |
313 | len += sprintf(buf + len, ", 2 - wide mode"); | |
314 | break; | |
315 | } | |
316 | /* always supported */ | |
26de7208 | 317 | len += sprintf(buf + len, " 3 - motion detection\n"); |
574fb258 JC |
318 | |
319 | return len; | |
320 | } | |
321 | ||
322 | /** | |
323 | * sca3000_show_measurmenet_mode() sysfs read of current mode | |
324 | **/ | |
325 | static ssize_t | |
326 | sca3000_show_measurement_mode(struct device *dev, | |
327 | struct device_attribute *attr, | |
328 | char *buf) | |
329 | { | |
330 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
83f0422d | 331 | struct sca3000_state *st = iio_priv(dev_info); |
574fb258 | 332 | int len = 0, ret; |
574fb258 JC |
333 | |
334 | mutex_lock(&st->lock); | |
25888dc5 | 335 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
336 | if (ret) |
337 | goto error_ret; | |
338 | /* mask bottom 2 bits - only ones that are relevant */ | |
25888dc5 JC |
339 | st->rx[0] &= 0x03; |
340 | switch (st->rx[0]) { | |
574fb258 JC |
341 | case SCA3000_MEAS_MODE_NORMAL: |
342 | len += sprintf(buf + len, "0 - normal mode\n"); | |
343 | break; | |
344 | case SCA3000_MEAS_MODE_MOT_DET: | |
345 | len += sprintf(buf + len, "3 - motion detection\n"); | |
346 | break; | |
347 | case SCA3000_MEAS_MODE_OP_1: | |
348 | switch (st->info->option_mode_1) { | |
349 | case SCA3000_OP_MODE_NARROW: | |
350 | len += sprintf(buf + len, "1 - narrow mode\n"); | |
351 | break; | |
352 | case SCA3000_OP_MODE_BYPASS: | |
353 | len += sprintf(buf + len, "1 - bypass mode\n"); | |
354 | break; | |
c608cb01 | 355 | } |
574fb258 JC |
356 | break; |
357 | case SCA3000_MEAS_MODE_OP_2: | |
358 | switch (st->info->option_mode_2) { | |
359 | case SCA3000_OP_MODE_WIDE: | |
360 | len += sprintf(buf + len, "2 - wide mode\n"); | |
361 | break; | |
362 | } | |
363 | break; | |
c608cb01 | 364 | } |
574fb258 JC |
365 | |
366 | error_ret: | |
367 | mutex_unlock(&st->lock); | |
368 | ||
369 | return ret ? ret : len; | |
370 | } | |
371 | ||
372 | /** | |
373 | * sca3000_store_measurement_mode() set the current mode | |
374 | **/ | |
375 | static ssize_t | |
376 | sca3000_store_measurement_mode(struct device *dev, | |
377 | struct device_attribute *attr, | |
378 | const char *buf, | |
379 | size_t len) | |
380 | { | |
381 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
83f0422d | 382 | struct sca3000_state *st = iio_priv(dev_info); |
574fb258 | 383 | int ret; |
574fb258 JC |
384 | int mask = 0x03; |
385 | long val; | |
386 | ||
387 | mutex_lock(&st->lock); | |
388 | ret = strict_strtol(buf, 10, &val); | |
389 | if (ret) | |
390 | goto error_ret; | |
25888dc5 | 391 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
392 | if (ret) |
393 | goto error_ret; | |
25888dc5 JC |
394 | st->rx[0] &= ~mask; |
395 | st->rx[0] |= (val & mask); | |
396 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]); | |
574fb258 | 397 | if (ret) |
25888dc5 | 398 | goto error_ret; |
574fb258 JC |
399 | mutex_unlock(&st->lock); |
400 | ||
401 | return len; | |
402 | ||
574fb258 JC |
403 | error_ret: |
404 | mutex_unlock(&st->lock); | |
405 | ||
406 | return ret; | |
407 | } | |
408 | ||
409 | ||
410 | /* Not even vaguely standard attributes so defined here rather than | |
411 | * in the relevant IIO core headers | |
412 | */ | |
f3fb0011 | 413 | static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO, |
574fb258 JC |
414 | sca3000_show_available_measurement_modes, |
415 | NULL, 0); | |
416 | ||
417 | static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR, | |
418 | sca3000_show_measurement_mode, | |
419 | sca3000_store_measurement_mode, | |
420 | 0); | |
421 | ||
422 | /* More standard attributes */ | |
423 | ||
355e25c1 | 424 | static IIO_DEVICE_ATTR(revision, S_IRUGO, sca3000_show_rev, NULL, 0); |
574fb258 | 425 | |
25888dc5 JC |
426 | #define SCA3000_INFO_MASK \ |
427 | (1 << IIO_CHAN_INFO_SCALE_SHARED) | |
428 | #define SCA3000_EVENT_MASK \ | |
429 | (IIO_EV_BIT(IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING)) | |
430 | ||
431 | static struct iio_chan_spec sca3000_channels[] = { | |
432 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X, SCA3000_INFO_MASK, | |
aaf370db | 433 | 0, 0, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 434 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y, SCA3000_INFO_MASK, |
aaf370db | 435 | 1, 1, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 436 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Z, SCA3000_INFO_MASK, |
aaf370db | 437 | 2, 2, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 438 | }; |
574fb258 | 439 | |
25888dc5 JC |
440 | static u8 sca3000_addresses[3][3] = { |
441 | [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH, | |
442 | SCA3000_MD_CTRL_OR_X}, | |
443 | [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH, | |
444 | SCA3000_MD_CTRL_OR_Y}, | |
445 | [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH, | |
446 | SCA3000_MD_CTRL_OR_Z}, | |
447 | }; | |
448 | ||
449 | static int sca3000_read_raw(struct iio_dev *indio_dev, | |
450 | struct iio_chan_spec const *chan, | |
451 | int *val, | |
452 | int *val2, | |
453 | long mask) | |
454 | { | |
83f0422d | 455 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
456 | int ret; |
457 | u8 address; | |
458 | ||
459 | switch (mask) { | |
460 | case 0: | |
461 | mutex_lock(&st->lock); | |
462 | if (st->mo_det_use_count) { | |
463 | mutex_unlock(&st->lock); | |
464 | return -EBUSY; | |
465 | } | |
466 | address = sca3000_addresses[chan->address][0]; | |
467 | ret = sca3000_read_data_short(st, address, 2); | |
468 | if (ret < 0) { | |
469 | mutex_unlock(&st->lock); | |
470 | return ret; | |
471 | } | |
472 | *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF; | |
473 | *val = ((*val) << (sizeof(*val)*8 - 13)) >> | |
474 | (sizeof(*val)*8 - 13); | |
475 | mutex_unlock(&st->lock); | |
476 | return IIO_VAL_INT; | |
477 | case (1 << IIO_CHAN_INFO_SCALE_SHARED): | |
478 | *val = 0; | |
479 | if (chan->type == IIO_ACCEL) | |
480 | *val2 = st->info->scale; | |
481 | else /* temperature */ | |
482 | *val2 = 555556; | |
483 | return IIO_VAL_INT_PLUS_MICRO; | |
484 | default: | |
485 | return -EINVAL; | |
486 | } | |
487 | } | |
574fb258 JC |
488 | |
489 | /** | |
490 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
491 | * | |
492 | * The later modes are only relevant to the ring buffer - and depend on current | |
493 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
494 | * division will give good enough answer and not all chips have them specified | |
495 | * at all. | |
496 | **/ | |
497 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
498 | struct device_attribute *attr, | |
499 | char *buf) | |
500 | { | |
501 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
83f0422d | 502 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
503 | int len = 0, ret, val; |
504 | ||
574fb258 | 505 | mutex_lock(&st->lock); |
25888dc5 JC |
506 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
507 | val = st->rx[0]; | |
574fb258 JC |
508 | mutex_unlock(&st->lock); |
509 | if (ret) | |
510 | goto error_ret; | |
25888dc5 JC |
511 | |
512 | switch (val & 0x03) { | |
574fb258 JC |
513 | case SCA3000_MEAS_MODE_NORMAL: |
514 | len += sprintf(buf + len, "%d %d %d\n", | |
515 | st->info->measurement_mode_freq, | |
516 | st->info->measurement_mode_freq/2, | |
517 | st->info->measurement_mode_freq/4); | |
518 | break; | |
519 | case SCA3000_MEAS_MODE_OP_1: | |
520 | len += sprintf(buf + len, "%d %d %d\n", | |
521 | st->info->option_mode_1_freq, | |
522 | st->info->option_mode_1_freq/2, | |
523 | st->info->option_mode_1_freq/4); | |
524 | break; | |
525 | case SCA3000_MEAS_MODE_OP_2: | |
526 | len += sprintf(buf + len, "%d %d %d\n", | |
527 | st->info->option_mode_2_freq, | |
528 | st->info->option_mode_2_freq/2, | |
529 | st->info->option_mode_2_freq/4); | |
530 | break; | |
c608cb01 | 531 | } |
574fb258 JC |
532 | return len; |
533 | error_ret: | |
534 | return ret; | |
535 | } | |
536 | /** | |
537 | * __sca3000_get_base_frequency() obtain mode specific base frequency | |
538 | * | |
539 | * lock must be held | |
540 | **/ | |
541 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
542 | const struct sca3000_chip_info *info, | |
543 | int *base_freq) | |
544 | { | |
545 | int ret; | |
574fb258 | 546 | |
25888dc5 | 547 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
548 | if (ret) |
549 | goto error_ret; | |
25888dc5 | 550 | switch (0x03 & st->rx[0]) { |
574fb258 JC |
551 | case SCA3000_MEAS_MODE_NORMAL: |
552 | *base_freq = info->measurement_mode_freq; | |
553 | break; | |
554 | case SCA3000_MEAS_MODE_OP_1: | |
555 | *base_freq = info->option_mode_1_freq; | |
556 | break; | |
557 | case SCA3000_MEAS_MODE_OP_2: | |
558 | *base_freq = info->option_mode_2_freq; | |
559 | break; | |
c608cb01 | 560 | } |
574fb258 JC |
561 | error_ret: |
562 | return ret; | |
563 | } | |
564 | ||
565 | /** | |
566 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
567 | **/ | |
568 | static ssize_t sca3000_read_frequency(struct device *dev, | |
569 | struct device_attribute *attr, | |
570 | char *buf) | |
571 | { | |
572 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
83f0422d | 573 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
574 | int ret, len = 0, base_freq = 0, val; |
575 | ||
574fb258 JC |
576 | mutex_lock(&st->lock); |
577 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
578 | if (ret) | |
579 | goto error_ret_mut; | |
25888dc5 | 580 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
574fb258 JC |
581 | mutex_unlock(&st->lock); |
582 | if (ret) | |
583 | goto error_ret; | |
25888dc5 | 584 | val = ret; |
574fb258 | 585 | if (base_freq > 0) |
25888dc5 | 586 | switch (val & 0x03) { |
574fb258 JC |
587 | case 0x00: |
588 | case 0x03: | |
589 | len = sprintf(buf, "%d\n", base_freq); | |
590 | break; | |
591 | case 0x01: | |
592 | len = sprintf(buf, "%d\n", base_freq/2); | |
593 | break; | |
594 | case 0x02: | |
595 | len = sprintf(buf, "%d\n", base_freq/4); | |
596 | break; | |
c608cb01 | 597 | } |
25888dc5 | 598 | |
574fb258 JC |
599 | return len; |
600 | error_ret_mut: | |
601 | mutex_unlock(&st->lock); | |
602 | error_ret: | |
603 | return ret; | |
604 | } | |
605 | ||
606 | /** | |
607 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
608 | **/ | |
609 | static ssize_t sca3000_set_frequency(struct device *dev, | |
610 | struct device_attribute *attr, | |
611 | const char *buf, | |
612 | size_t len) | |
613 | { | |
614 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
83f0422d | 615 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 | 616 | int ret, base_freq = 0; |
25888dc5 | 617 | int ctrlval; |
574fb258 JC |
618 | long val; |
619 | ||
620 | ret = strict_strtol(buf, 10, &val); | |
621 | if (ret) | |
622 | return ret; | |
623 | ||
624 | mutex_lock(&st->lock); | |
625 | /* What mode are we in? */ | |
626 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
627 | if (ret) | |
628 | goto error_free_lock; | |
629 | ||
25888dc5 JC |
630 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
631 | if (ret < 0) | |
574fb258 | 632 | goto error_free_lock; |
25888dc5 | 633 | ctrlval = ret; |
574fb258 | 634 | /* clear the bits */ |
25888dc5 | 635 | ctrlval &= ~0x03; |
574fb258 JC |
636 | |
637 | if (val == base_freq/2) { | |
25888dc5 | 638 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2; |
574fb258 | 639 | } else if (val == base_freq/4) { |
25888dc5 | 640 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4; |
574fb258 JC |
641 | } else if (val != base_freq) { |
642 | ret = -EINVAL; | |
643 | goto error_free_lock; | |
644 | } | |
25888dc5 JC |
645 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, |
646 | ctrlval); | |
574fb258 JC |
647 | error_free_lock: |
648 | mutex_unlock(&st->lock); | |
649 | ||
650 | return ret ? ret : len; | |
651 | } | |
652 | ||
653 | /* Should only really be registered if ring buffer support is compiled in. | |
654 | * Does no harm however and doing it right would add a fair bit of complexity | |
655 | */ | |
f3fb0011 | 656 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq); |
574fb258 JC |
657 | |
658 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
659 | sca3000_read_frequency, | |
660 | sca3000_set_frequency); | |
661 | ||
662 | ||
663 | /** | |
664 | * sca3000_read_temp() sysfs interface to get the temperature when available | |
665 | * | |
666 | * The alignment of data in here is downright odd. See data sheet. | |
667 | * Converting this into a meaningful value is left to inline functions in | |
668 | * userspace part of header. | |
669 | **/ | |
670 | static ssize_t sca3000_read_temp(struct device *dev, | |
671 | struct device_attribute *attr, | |
672 | char *buf) | |
673 | { | |
674 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
83f0422d | 675 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 676 | int ret; |
574fb258 | 677 | int val; |
25888dc5 | 678 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2); |
574fb258 JC |
679 | if (ret < 0) |
680 | goto error_ret; | |
25888dc5 | 681 | val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5); |
574fb258 | 682 | |
25888dc5 | 683 | return sprintf(buf, "%d\n", val); |
574fb258 JC |
684 | |
685 | error_ret: | |
686 | return ret; | |
687 | } | |
f3fb0011 JC |
688 | static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp); |
689 | ||
51a0a5b0 MS |
690 | static IIO_CONST_ATTR_TEMP_SCALE("0.555556"); |
691 | static IIO_CONST_ATTR_TEMP_OFFSET("-214.6"); | |
574fb258 JC |
692 | |
693 | /** | |
25888dc5 | 694 | * sca3000_read_thresh() - query of a threshold |
574fb258 | 695 | **/ |
25888dc5 JC |
696 | static int sca3000_read_thresh(struct iio_dev *indio_dev, |
697 | int e, | |
698 | int *val) | |
574fb258 | 699 | { |
25888dc5 | 700 | int ret, i; |
83f0422d | 701 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 702 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 703 | mutex_lock(&st->lock); |
25888dc5 | 704 | ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]); |
574fb258 | 705 | mutex_unlock(&st->lock); |
25888dc5 | 706 | if (ret < 0) |
574fb258 | 707 | return ret; |
25888dc5 JC |
708 | *val = 0; |
709 | if (num == 1) | |
710 | for_each_set_bit(i, (unsigned long *)&ret, | |
711 | ARRAY_SIZE(st->info->mot_det_mult_y)) | |
712 | *val += st->info->mot_det_mult_y[i]; | |
713 | else | |
714 | for_each_set_bit(i, (unsigned long *)&ret, | |
715 | ARRAY_SIZE(st->info->mot_det_mult_xz)) | |
716 | *val += st->info->mot_det_mult_xz[i]; | |
574fb258 | 717 | |
25888dc5 | 718 | return 0; |
574fb258 JC |
719 | } |
720 | ||
721 | /** | |
25888dc5 | 722 | * sca3000_write_thresh() control of threshold |
574fb258 | 723 | **/ |
25888dc5 JC |
724 | static int sca3000_write_thresh(struct iio_dev *indio_dev, |
725 | int e, | |
726 | int val) | |
574fb258 | 727 | { |
83f0422d | 728 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 729 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 730 | int ret; |
25888dc5 JC |
731 | int i; |
732 | u8 nonlinear = 0; | |
733 | ||
734 | if (num == 1) { | |
735 | i = ARRAY_SIZE(st->info->mot_det_mult_y); | |
736 | while (i > 0) | |
737 | if (val >= st->info->mot_det_mult_y[--i]) { | |
738 | nonlinear |= (1 << i); | |
739 | val -= st->info->mot_det_mult_y[i]; | |
740 | } | |
741 | } else { | |
742 | i = ARRAY_SIZE(st->info->mot_det_mult_xz); | |
743 | while (i > 0) | |
744 | if (val >= st->info->mot_det_mult_xz[--i]) { | |
745 | nonlinear |= (1 << i); | |
746 | val -= st->info->mot_det_mult_xz[i]; | |
747 | } | |
748 | } | |
574fb258 | 749 | |
574fb258 | 750 | mutex_lock(&st->lock); |
25888dc5 | 751 | ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear); |
574fb258 JC |
752 | mutex_unlock(&st->lock); |
753 | ||
25888dc5 | 754 | return ret; |
574fb258 JC |
755 | } |
756 | ||
574fb258 | 757 | static struct attribute *sca3000_attributes[] = { |
574fb258 | 758 | &iio_dev_attr_revision.dev_attr.attr, |
f3fb0011 | 759 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 760 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 761 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
762 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
763 | NULL, | |
764 | }; | |
765 | ||
766 | static struct attribute *sca3000_attributes_with_temp[] = { | |
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 | /* Only present if temp sensor is */ | |
f3fb0011 JC |
773 | &iio_dev_attr_temp_raw.dev_attr.attr, |
774 | &iio_const_attr_temp_offset.dev_attr.attr, | |
775 | &iio_const_attr_temp_scale.dev_attr.attr, | |
574fb258 JC |
776 | NULL, |
777 | }; | |
778 | ||
779 | static const struct attribute_group sca3000_attribute_group = { | |
780 | .attrs = sca3000_attributes, | |
781 | }; | |
782 | ||
783 | static const struct attribute_group sca3000_attribute_group_with_temp = { | |
784 | .attrs = sca3000_attributes_with_temp, | |
785 | }; | |
786 | ||
787 | /* RING RELATED interrupt handler */ | |
788 | /* depending on event, push to the ring buffer event chrdev or the event one */ | |
789 | ||
790 | /** | |
25888dc5 | 791 | * sca3000_event_handler() - handling ring and non ring events |
574fb258 JC |
792 | * |
793 | * This function is complicated by the fact that the devices can signify ring | |
794 | * and non ring events via the same interrupt line and they can only | |
795 | * be distinguished via a read of the relevant status register. | |
796 | **/ | |
25888dc5 | 797 | static irqreturn_t sca3000_event_handler(int irq, void *private) |
574fb258 | 798 | { |
25888dc5 | 799 | struct iio_dev *indio_dev = private; |
83f0422d | 800 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 JC |
801 | int ret, val; |
802 | s64 last_timestamp = iio_get_time_ns(); | |
574fb258 JC |
803 | |
804 | /* Could lead if badly timed to an extra read of status reg, | |
805 | * but ensures no interrupt is missed. | |
806 | */ | |
574fb258 | 807 | mutex_lock(&st->lock); |
25888dc5 JC |
808 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
809 | val = st->rx[0]; | |
574fb258 JC |
810 | mutex_unlock(&st->lock); |
811 | if (ret) | |
812 | goto done; | |
813 | ||
83f0422d | 814 | sca3000_ring_int_process(val, indio_dev->ring); |
574fb258 | 815 | |
25888dc5 | 816 | if (val & SCA3000_INT_STATUS_FREE_FALL) |
83f0422d | 817 | iio_push_event(indio_dev, 0, |
c4b14d99 | 818 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 819 | 0, |
c4b14d99 | 820 | IIO_MOD_X_AND_Y_AND_Z, |
de9fe32a JC |
821 | IIO_EV_TYPE_MAG, |
822 | IIO_EV_DIR_FALLING), | |
25888dc5 | 823 | last_timestamp); |
574fb258 | 824 | |
25888dc5 | 825 | if (val & SCA3000_INT_STATUS_Y_TRIGGER) |
83f0422d | 826 | iio_push_event(indio_dev, 0, |
c4b14d99 | 827 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 828 | 0, |
c4b14d99 | 829 | IIO_MOD_Y, |
de9fe32a JC |
830 | IIO_EV_TYPE_MAG, |
831 | IIO_EV_DIR_RISING), | |
25888dc5 | 832 | last_timestamp); |
574fb258 | 833 | |
25888dc5 | 834 | if (val & SCA3000_INT_STATUS_X_TRIGGER) |
83f0422d | 835 | iio_push_event(indio_dev, 0, |
c4b14d99 | 836 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 837 | 0, |
c4b14d99 | 838 | IIO_MOD_X, |
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_Z_TRIGGER) |
83f0422d | 844 | iio_push_event(indio_dev, 0, |
c4b14d99 | 845 | IIO_MOD_EVENT_CODE(IIO_ACCEL, |
de9fe32a | 846 | 0, |
c4b14d99 | 847 | IIO_MOD_Z, |
de9fe32a JC |
848 | IIO_EV_TYPE_MAG, |
849 | IIO_EV_DIR_RISING), | |
25888dc5 | 850 | last_timestamp); |
574fb258 JC |
851 | |
852 | done: | |
25888dc5 | 853 | return IRQ_HANDLED; |
574fb258 JC |
854 | } |
855 | ||
856 | /** | |
25888dc5 | 857 | * sca3000_read_event_config() what events are enabled |
574fb258 | 858 | **/ |
25888dc5 JC |
859 | static int sca3000_read_event_config(struct iio_dev *indio_dev, |
860 | int e) | |
574fb258 | 861 | { |
83f0422d | 862 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 863 | int ret; |
574fb258 | 864 | u8 protect_mask = 0x03; |
25888dc5 | 865 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
866 | |
867 | /* read current value of mode register */ | |
868 | mutex_lock(&st->lock); | |
25888dc5 | 869 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
870 | if (ret) |
871 | goto error_ret; | |
872 | ||
25888dc5 JC |
873 | if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) |
874 | ret = 0; | |
574fb258 | 875 | else { |
25888dc5 JC |
876 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
877 | if (ret < 0) | |
574fb258 JC |
878 | goto error_ret; |
879 | /* only supporting logical or's for now */ | |
25888dc5 | 880 | ret = !!(ret & sca3000_addresses[num][2]); |
574fb258 | 881 | } |
574fb258 JC |
882 | error_ret: |
883 | mutex_unlock(&st->lock); | |
884 | ||
25888dc5 | 885 | return ret; |
574fb258 JC |
886 | } |
887 | /** | |
888 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
889 | **/ | |
890 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
891 | struct device_attribute *attr, | |
892 | char *buf) | |
893 | { | |
894 | int ret, len; | |
574fb258 | 895 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
83f0422d | 896 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 897 | int val; |
574fb258 JC |
898 | |
899 | mutex_lock(&st->lock); | |
25888dc5 JC |
900 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
901 | val = st->rx[0]; | |
574fb258 | 902 | mutex_unlock(&st->lock); |
25888dc5 | 903 | if (ret < 0) |
574fb258 JC |
904 | return ret; |
905 | len = sprintf(buf, "%d\n", | |
25888dc5 | 906 | !!(val & SCA3000_FREE_FALL_DETECT)); |
574fb258 JC |
907 | return len; |
908 | } | |
574fb258 JC |
909 | |
910 | /** | |
911 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
912 | * | |
913 | * In these chips the free fall detector should send an interrupt if | |
914 | * the device falls more than 25cm. This has not been tested due | |
915 | * to fragile wiring. | |
916 | **/ | |
917 | ||
918 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, | |
919 | struct device_attribute *attr, | |
920 | const char *buf, | |
921 | size_t len) | |
922 | { | |
923 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
83f0422d | 924 | struct sca3000_state *st = iio_priv(indio_dev); |
574fb258 JC |
925 | long val; |
926 | int ret; | |
574fb258 JC |
927 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; |
928 | ||
929 | mutex_lock(&st->lock); | |
930 | ret = strict_strtol(buf, 10, &val); | |
931 | if (ret) | |
932 | goto error_ret; | |
933 | ||
934 | /* read current value of mode register */ | |
25888dc5 | 935 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
936 | if (ret) |
937 | goto error_ret; | |
938 | ||
939 | /*if off and should be on*/ | |
25888dc5 | 940 | if (val && !(st->rx[0] & protect_mask)) |
574fb258 | 941 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 942 | (st->rx[0] | SCA3000_FREE_FALL_DETECT)); |
574fb258 | 943 | /* if on and should be off */ |
25888dc5 | 944 | else if (!val && (st->rx[0] & protect_mask)) |
574fb258 | 945 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 946 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
947 | error_ret: |
948 | mutex_unlock(&st->lock); | |
949 | ||
950 | return ret ? ret : len; | |
951 | } | |
952 | ||
953 | /** | |
954 | * sca3000_set_mo_det() simple on off control for motion detector | |
955 | * | |
956 | * This is a per axis control, but enabling any will result in the | |
957 | * motion detector unit being enabled. | |
958 | * N.B. enabling motion detector stops normal data acquisition. | |
959 | * There is a complexity in knowing which mode to return to when | |
960 | * this mode is disabled. Currently normal mode is assumed. | |
961 | **/ | |
25888dc5 JC |
962 | static int sca3000_write_event_config(struct iio_dev *indio_dev, |
963 | int e, | |
25888dc5 | 964 | int state) |
574fb258 | 965 | { |
83f0422d | 966 | struct sca3000_state *st = iio_priv(indio_dev); |
25888dc5 | 967 | int ret, ctrlval; |
574fb258 | 968 | u8 protect_mask = 0x03; |
25888dc5 | 969 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
970 | |
971 | mutex_lock(&st->lock); | |
972 | /* First read the motion detector config to find out if | |
973 | * this axis is on*/ | |
25888dc5 JC |
974 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
975 | if (ret < 0) | |
574fb258 | 976 | goto exit_point; |
25888dc5 | 977 | ctrlval = ret; |
574fb258 | 978 | /* Off and should be on */ |
25888dc5 | 979 | if (state && !(ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
980 | ret = sca3000_write_ctrl_reg(st, |
981 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
982 | ctrlval | |
983 | sca3000_addresses[num][2]); | |
574fb258 | 984 | if (ret) |
25888dc5 | 985 | goto exit_point; |
574fb258 | 986 | st->mo_det_use_count++; |
25888dc5 | 987 | } else if (!state && (ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
988 | ret = sca3000_write_ctrl_reg(st, |
989 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
990 | ctrlval & |
991 | ~(sca3000_addresses[num][2])); | |
574fb258 | 992 | if (ret) |
25888dc5 | 993 | goto exit_point; |
574fb258 | 994 | st->mo_det_use_count--; |
25888dc5 JC |
995 | } |
996 | ||
574fb258 | 997 | /* read current value of mode register */ |
25888dc5 | 998 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
999 | if (ret) |
1000 | goto exit_point; | |
1001 | /*if off and should be on*/ | |
1002 | if ((st->mo_det_use_count) | |
25888dc5 | 1003 | && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1004 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1005 | (st->rx[0] & ~protect_mask) |
574fb258 JC |
1006 | | SCA3000_MEAS_MODE_MOT_DET); |
1007 | /* if on and should be off */ | |
1008 | else if (!(st->mo_det_use_count) | |
25888dc5 | 1009 | && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1010 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1011 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
1012 | exit_point: |
1013 | mutex_unlock(&st->lock); | |
1014 | ||
25888dc5 | 1015 | return ret; |
574fb258 JC |
1016 | } |
1017 | ||
574fb258 | 1018 | /* Free fall detector related event attribute */ |
aaf370db JC |
1019 | static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, |
1020 | accel_x&y&z_mag_falling_en, | |
1021 | S_IRUGO | S_IWUSR, | |
1022 | sca3000_query_free_fall_mode, | |
1023 | sca3000_set_free_fall_mode, | |
1024 | 0); | |
fc5d0e42 | 1025 | |
25888dc5 JC |
1026 | static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period, |
1027 | accel_x&y&z_mag_falling_period, | |
1028 | "0.226"); | |
574fb258 JC |
1029 | |
1030 | static struct attribute *sca3000_event_attributes[] = { | |
aaf370db | 1031 | &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr, |
fc5d0e42 | 1032 | &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr, |
574fb258 JC |
1033 | NULL, |
1034 | }; | |
1035 | ||
1036 | static struct attribute_group sca3000_event_attribute_group = { | |
1037 | .attrs = sca3000_event_attributes, | |
1038 | }; | |
1039 | ||
1040 | /** | |
1041 | * sca3000_clean_setup() get the device into a predictable state | |
1042 | * | |
1043 | * Devices use flash memory to store many of the register values | |
1044 | * and hence can come up in somewhat unpredictable states. | |
1045 | * Hence reset everything on driver load. | |
1046 | **/ | |
1047 | static int sca3000_clean_setup(struct sca3000_state *st) | |
1048 | { | |
1049 | int ret; | |
574fb258 JC |
1050 | |
1051 | mutex_lock(&st->lock); | |
1052 | /* Ensure all interrupts have been acknowledged */ | |
25888dc5 | 1053 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
574fb258 JC |
1054 | if (ret) |
1055 | goto error_ret; | |
574fb258 JC |
1056 | |
1057 | /* Turn off all motion detection channels */ | |
25888dc5 JC |
1058 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
1059 | if (ret < 0) | |
574fb258 | 1060 | goto error_ret; |
25888dc5 JC |
1061 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL, |
1062 | ret & SCA3000_MD_CTRL_PROT_MASK); | |
574fb258 JC |
1063 | if (ret) |
1064 | goto error_ret; | |
1065 | ||
1066 | /* Disable ring buffer */ | |
25888dc5 JC |
1067 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
1068 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1069 | (ret & SCA3000_OUT_CTRL_PROT_MASK) | |
574fb258 JC |
1070 | | SCA3000_OUT_CTRL_BUF_X_EN |
1071 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1072 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1073 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
574fb258 JC |
1074 | if (ret) |
1075 | goto error_ret; | |
1076 | /* Enable interrupts, relevant to mode and set up as active low */ | |
25888dc5 | 1077 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1078 | if (ret) |
1079 | goto error_ret; | |
1080 | ret = sca3000_write_reg(st, | |
1081 | SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 | 1082 | (ret & SCA3000_INT_MASK_PROT_MASK) |
574fb258 | 1083 | | SCA3000_INT_MASK_ACTIVE_LOW); |
574fb258 JC |
1084 | if (ret) |
1085 | goto error_ret; | |
1086 | /* Select normal measurement mode, free fall off, ring off */ | |
1087 | /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1088 | * as that occurs in one of the example on the datasheet */ | |
25888dc5 | 1089 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1090 | if (ret) |
1091 | goto error_ret; | |
25888dc5 JC |
1092 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
1093 | (st->rx[0] & SCA3000_MODE_PROT_MASK)); | |
574fb258 JC |
1094 | st->bpse = 11; |
1095 | ||
1096 | error_ret: | |
1097 | mutex_unlock(&st->lock); | |
1098 | return ret; | |
1099 | } | |
1100 | ||
6fe8135f JC |
1101 | static const struct iio_info sca3000_info = { |
1102 | .attrs = &sca3000_attribute_group, | |
1103 | .read_raw = &sca3000_read_raw, | |
1104 | .num_interrupt_lines = 1, | |
1105 | .event_attrs = &sca3000_event_attribute_group, | |
1106 | .read_event_value = &sca3000_read_thresh, | |
1107 | .write_event_value = &sca3000_write_thresh, | |
1108 | .read_event_config = &sca3000_read_event_config, | |
1109 | .write_event_config = &sca3000_write_event_config, | |
1110 | .driver_module = THIS_MODULE, | |
1111 | }; | |
1112 | ||
1113 | static const struct iio_info sca3000_info_with_temp = { | |
1114 | .attrs = &sca3000_attribute_group_with_temp, | |
1115 | .read_raw = &sca3000_read_raw, | |
1116 | .read_event_value = &sca3000_read_thresh, | |
1117 | .write_event_value = &sca3000_write_thresh, | |
1118 | .read_event_config = &sca3000_read_event_config, | |
1119 | .write_event_config = &sca3000_write_event_config, | |
1120 | .driver_module = THIS_MODULE, | |
1121 | }; | |
1122 | ||
25888dc5 | 1123 | static int __devinit sca3000_probe(struct spi_device *spi) |
574fb258 JC |
1124 | { |
1125 | int ret, regdone = 0; | |
1126 | struct sca3000_state *st; | |
83f0422d | 1127 | struct iio_dev *indio_dev; |
574fb258 | 1128 | |
83f0422d JC |
1129 | indio_dev = iio_allocate_device(sizeof(*st)); |
1130 | if (indio_dev == NULL) { | |
574fb258 JC |
1131 | ret = -ENOMEM; |
1132 | goto error_ret; | |
1133 | } | |
574fb258 | 1134 | |
03bda05d | 1135 | st = iio_priv(indio_dev); |
83f0422d | 1136 | spi_set_drvdata(spi, indio_dev); |
574fb258 JC |
1137 | st->us = spi; |
1138 | mutex_init(&st->lock); | |
25888dc5 JC |
1139 | st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi) |
1140 | ->driver_data]; | |
574fb258 | 1141 | |
83f0422d JC |
1142 | indio_dev->dev.parent = &spi->dev; |
1143 | indio_dev->name = spi_get_device_id(spi)->name; | |
574fb258 | 1144 | if (st->info->temp_output) |
83f0422d | 1145 | indio_dev->info = &sca3000_info_with_temp; |
25888dc5 | 1146 | else { |
83f0422d JC |
1147 | indio_dev->info = &sca3000_info; |
1148 | indio_dev->channels = sca3000_channels; | |
1149 | indio_dev->num_channels = ARRAY_SIZE(sca3000_channels); | |
25888dc5 | 1150 | } |
83f0422d | 1151 | indio_dev->modes = INDIO_DIRECT_MODE; |
574fb258 | 1152 | |
83f0422d JC |
1153 | sca3000_configure_ring(indio_dev); |
1154 | ret = iio_device_register(indio_dev); | |
574fb258 JC |
1155 | if (ret < 0) |
1156 | goto error_free_dev; | |
1157 | regdone = 1; | |
83f0422d | 1158 | ret = iio_ring_buffer_register_ex(indio_dev->ring, 0, |
25888dc5 JC |
1159 | sca3000_channels, |
1160 | ARRAY_SIZE(sca3000_channels)); | |
574fb258 JC |
1161 | if (ret < 0) |
1162 | goto error_unregister_dev; | |
1163 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) { | |
25888dc5 JC |
1164 | ret = request_threaded_irq(spi->irq, |
1165 | NULL, | |
1166 | &sca3000_event_handler, | |
1167 | IRQF_TRIGGER_FALLING, | |
1168 | "sca3000", | |
83f0422d | 1169 | indio_dev); |
574fb258 JC |
1170 | if (ret) |
1171 | goto error_unregister_ring; | |
574fb258 | 1172 | } |
83f0422d | 1173 | sca3000_register_ring_funcs(indio_dev); |
574fb258 JC |
1174 | ret = sca3000_clean_setup(st); |
1175 | if (ret) | |
25888dc5 | 1176 | goto error_free_irq; |
574fb258 JC |
1177 | return 0; |
1178 | ||
25888dc5 | 1179 | error_free_irq: |
574fb258 | 1180 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) |
83f0422d | 1181 | free_irq(spi->irq, indio_dev); |
574fb258 | 1182 | error_unregister_ring: |
83f0422d | 1183 | iio_ring_buffer_unregister(indio_dev->ring); |
574fb258 JC |
1184 | error_unregister_dev: |
1185 | error_free_dev: | |
1186 | if (regdone) | |
83f0422d | 1187 | iio_device_unregister(indio_dev); |
574fb258 | 1188 | else |
83f0422d JC |
1189 | iio_free_device(indio_dev); |
1190 | ||
574fb258 JC |
1191 | error_ret: |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1196 | { | |
1197 | int ret; | |
574fb258 JC |
1198 | |
1199 | mutex_lock(&st->lock); | |
25888dc5 | 1200 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1201 | if (ret) |
1202 | goto error_ret; | |
1203 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 JC |
1204 | (st->rx[0] & |
1205 | ~(SCA3000_INT_MASK_RING_THREE_QUARTER | | |
1206 | SCA3000_INT_MASK_RING_HALF | | |
1207 | SCA3000_INT_MASK_ALL_INTS))); | |
574fb258 | 1208 | error_ret: |
25888dc5 | 1209 | mutex_unlock(&st->lock); |
574fb258 | 1210 | return ret; |
574fb258 JC |
1211 | } |
1212 | ||
1213 | static int sca3000_remove(struct spi_device *spi) | |
1214 | { | |
83f0422d JC |
1215 | struct iio_dev *indio_dev = spi_get_drvdata(spi); |
1216 | struct sca3000_state *st = iio_priv(indio_dev); | |
574fb258 JC |
1217 | int ret; |
1218 | /* Must ensure no interrupts can be generated after this!*/ | |
1219 | ret = sca3000_stop_all_interrupts(st); | |
1220 | if (ret) | |
1221 | return ret; | |
1222 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) | |
25888dc5 | 1223 | free_irq(spi->irq, indio_dev); |
574fb258 JC |
1224 | iio_ring_buffer_unregister(indio_dev->ring); |
1225 | sca3000_unconfigure_ring(indio_dev); | |
1226 | iio_device_unregister(indio_dev); | |
1227 | ||
574fb258 JC |
1228 | return 0; |
1229 | } | |
1230 | ||
25888dc5 JC |
1231 | static const struct spi_device_id sca3000_id[] = { |
1232 | {"sca3000_d01", d01}, | |
1233 | {"sca3000_e02", e02}, | |
1234 | {"sca3000_e04", e04}, | |
1235 | {"sca3000_e05", e05}, | |
1236 | {} | |
1237 | }; | |
574fb258 | 1238 | |
25888dc5 JC |
1239 | static struct spi_driver sca3000_driver = { |
1240 | .driver = { | |
1241 | .name = "sca3000", | |
1242 | .owner = THIS_MODULE, | |
1243 | }, | |
1244 | .probe = sca3000_probe, | |
1245 | .remove = __devexit_p(sca3000_remove), | |
1246 | .id_table = sca3000_id, | |
1247 | }; | |
574fb258 | 1248 | |
574fb258 JC |
1249 | static __init int sca3000_init(void) |
1250 | { | |
25888dc5 | 1251 | return spi_register_driver(&sca3000_driver); |
574fb258 | 1252 | } |
25888dc5 | 1253 | module_init(sca3000_init); |
574fb258 JC |
1254 | |
1255 | static __exit void sca3000_exit(void) | |
1256 | { | |
25888dc5 | 1257 | spi_unregister_driver(&sca3000_driver); |
574fb258 | 1258 | } |
574fb258 JC |
1259 | module_exit(sca3000_exit); |
1260 | ||
1261 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
1262 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); | |
1263 | MODULE_LICENSE("GPL v2"); |