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574fb258 JC |
1 | /* |
2 | * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
8 | * Copyright (c) 2009 Jonathan Cameron <jic23@cam.ac.uk> | |
9 | * | |
10 | * See industrialio/accels/sca3000.h for comments. | |
11 | */ | |
12 | ||
13 | #include <linux/interrupt.h> | |
14 | #include <linux/gpio.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/device.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
574fb258 JC |
18 | #include <linux/kernel.h> |
19 | #include <linux/spi/spi.h> | |
20 | #include <linux/sysfs.h> | |
21 | #include "../iio.h" | |
22 | #include "../sysfs.h" | |
23 | #include "../ring_generic.h" | |
24 | ||
25 | #include "accel.h" | |
26 | #include "sca3000.h" | |
27 | ||
28 | enum sca3000_variant { | |
29 | d01, | |
574fb258 JC |
30 | e02, |
31 | e04, | |
32 | e05, | |
574fb258 JC |
33 | }; |
34 | ||
35 | /* Note where option modes are not defined, the chip simply does not | |
36 | * support any. | |
37 | * Other chips in the sca3000 series use i2c and are not included here. | |
38 | * | |
39 | * Some of these devices are only listed in the family data sheet and | |
40 | * do not actually appear to be available. | |
41 | */ | |
42 | static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = { | |
43 | { | |
44 | .name = "sca3000-d01", | |
25888dc5 | 45 | .scale = 7357, |
574fb258 JC |
46 | .temp_output = true, |
47 | .measurement_mode_freq = 250, | |
48 | .option_mode_1 = SCA3000_OP_MODE_BYPASS, | |
49 | .option_mode_1_freq = 250, | |
25888dc5 JC |
50 | .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300}, |
51 | .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750}, | |
574fb258 JC |
52 | }, { |
53 | .name = "sca3000-e02", | |
25888dc5 | 54 | .scale = 9810, |
574fb258 JC |
55 | .measurement_mode_freq = 125, |
56 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
57 | .option_mode_1_freq = 63, | |
25888dc5 JC |
58 | .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050}, |
59 | .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700}, | |
574fb258 JC |
60 | }, { |
61 | .name = "sca3000-e04", | |
25888dc5 | 62 | .scale = 19620, |
574fb258 JC |
63 | .measurement_mode_freq = 100, |
64 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
65 | .option_mode_1_freq = 50, | |
66 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
67 | .option_mode_2_freq = 400, | |
25888dc5 JC |
68 | .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100}, |
69 | .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000}, | |
574fb258 JC |
70 | }, { |
71 | .name = "sca3000-e05", | |
25888dc5 | 72 | .scale = 61313, |
574fb258 JC |
73 | .measurement_mode_freq = 200, |
74 | .option_mode_1 = SCA3000_OP_MODE_NARROW, | |
75 | .option_mode_1_freq = 50, | |
76 | .option_mode_2 = SCA3000_OP_MODE_WIDE, | |
77 | .option_mode_2_freq = 400, | |
25888dc5 JC |
78 | .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900}, |
79 | .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600}, | |
574fb258 JC |
80 | }, |
81 | }; | |
82 | ||
574fb258 JC |
83 | int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val) |
84 | { | |
574fb258 JC |
85 | st->tx[0] = SCA3000_WRITE_REG(address); |
86 | st->tx[1] = val; | |
25888dc5 | 87 | return spi_write(st->us, st->tx, 2); |
574fb258 JC |
88 | } |
89 | ||
25888dc5 JC |
90 | int sca3000_read_data_short(struct sca3000_state *st, |
91 | uint8_t reg_address_high, | |
92 | int len) | |
574fb258 | 93 | { |
574fb258 | 94 | struct spi_message msg; |
25888dc5 JC |
95 | struct spi_transfer xfer[2] = { |
96 | { | |
97 | .len = 1, | |
98 | .tx_buf = st->tx, | |
99 | }, { | |
100 | .len = len, | |
101 | .rx_buf = st->rx, | |
102 | } | |
574fb258 | 103 | }; |
574fb258 JC |
104 | st->tx[0] = SCA3000_READ_REG(reg_address_high); |
105 | spi_message_init(&msg); | |
25888dc5 JC |
106 | spi_message_add_tail(&xfer[0], &msg); |
107 | spi_message_add_tail(&xfer[1], &msg); | |
574fb258 | 108 | |
25888dc5 | 109 | return spi_sync(st->us, &msg); |
574fb258 | 110 | } |
25888dc5 | 111 | |
574fb258 JC |
112 | /** |
113 | * sca3000_reg_lock_on() test if the ctrl register lock is on | |
114 | * | |
115 | * Lock must be held. | |
116 | **/ | |
117 | static int sca3000_reg_lock_on(struct sca3000_state *st) | |
118 | { | |
574fb258 JC |
119 | int ret; |
120 | ||
25888dc5 | 121 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
122 | if (ret < 0) |
123 | return ret; | |
574fb258 | 124 | |
25888dc5 | 125 | return !(st->rx[0] & SCA3000_LOCKED); |
574fb258 JC |
126 | } |
127 | ||
128 | /** | |
129 | * __sca3000_unlock_reg_lock() unlock the control registers | |
130 | * | |
131 | * Note the device does not appear to support doing this in a single transfer. | |
132 | * This should only ever be used as part of ctrl reg read. | |
133 | * Lock must be held before calling this | |
134 | **/ | |
135 | static int __sca3000_unlock_reg_lock(struct sca3000_state *st) | |
136 | { | |
137 | struct spi_message msg; | |
138 | struct spi_transfer xfer[3] = { | |
139 | { | |
574fb258 JC |
140 | .len = 2, |
141 | .cs_change = 1, | |
142 | .tx_buf = st->tx, | |
143 | }, { | |
574fb258 JC |
144 | .len = 2, |
145 | .cs_change = 1, | |
146 | .tx_buf = st->tx + 2, | |
147 | }, { | |
574fb258 | 148 | .len = 2, |
574fb258 JC |
149 | .tx_buf = st->tx + 4, |
150 | }, | |
151 | }; | |
152 | st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
153 | st->tx[1] = 0x00; | |
154 | st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
155 | st->tx[3] = 0x50; | |
156 | st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK); | |
157 | st->tx[5] = 0xA0; | |
158 | spi_message_init(&msg); | |
159 | spi_message_add_tail(&xfer[0], &msg); | |
160 | spi_message_add_tail(&xfer[1], &msg); | |
161 | spi_message_add_tail(&xfer[2], &msg); | |
162 | ||
163 | return spi_sync(st->us, &msg); | |
164 | } | |
165 | ||
166 | /** | |
167 | * sca3000_write_ctrl_reg() write to a lock protect ctrl register | |
168 | * @sel: selects which registers we wish to write to | |
169 | * @val: the value to be written | |
170 | * | |
171 | * Certain control registers are protected against overwriting by the lock | |
172 | * register and use a shared write address. This function allows writing of | |
173 | * these registers. | |
174 | * Lock must be held. | |
175 | **/ | |
176 | static int sca3000_write_ctrl_reg(struct sca3000_state *st, | |
177 | uint8_t sel, | |
178 | uint8_t val) | |
179 | { | |
180 | ||
181 | int ret; | |
182 | ||
183 | ret = sca3000_reg_lock_on(st); | |
184 | if (ret < 0) | |
185 | goto error_ret; | |
186 | if (ret) { | |
187 | ret = __sca3000_unlock_reg_lock(st); | |
188 | if (ret) | |
189 | goto error_ret; | |
190 | } | |
191 | ||
192 | /* Set the control select register */ | |
193 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel); | |
194 | if (ret) | |
195 | goto error_ret; | |
196 | ||
197 | /* Write the actual value into the register */ | |
198 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val); | |
199 | ||
200 | error_ret: | |
201 | return ret; | |
202 | } | |
203 | ||
204 | /* Crucial that lock is called before calling this */ | |
205 | /** | |
206 | * sca3000_read_ctrl_reg() read from lock protected control register. | |
207 | * | |
208 | * Lock must be held. | |
209 | **/ | |
210 | static int sca3000_read_ctrl_reg(struct sca3000_state *st, | |
25888dc5 | 211 | u8 ctrl_reg) |
574fb258 JC |
212 | { |
213 | int ret; | |
214 | ||
215 | ret = sca3000_reg_lock_on(st); | |
216 | if (ret < 0) | |
217 | goto error_ret; | |
218 | if (ret) { | |
219 | ret = __sca3000_unlock_reg_lock(st); | |
220 | if (ret) | |
221 | goto error_ret; | |
222 | } | |
223 | /* Set the control select register */ | |
224 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg); | |
225 | if (ret) | |
226 | goto error_ret; | |
25888dc5 JC |
227 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1); |
228 | if (ret) | |
229 | goto error_ret; | |
230 | else | |
231 | return st->rx[0]; | |
574fb258 JC |
232 | error_ret: |
233 | return ret; | |
234 | } | |
235 | ||
236 | #ifdef SCA3000_DEBUG | |
237 | /** | |
238 | * sca3000_check_status() check the status register | |
239 | * | |
240 | * Only used for debugging purposes | |
241 | **/ | |
242 | static int sca3000_check_status(struct device *dev) | |
243 | { | |
574fb258 JC |
244 | int ret; |
245 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
246 | struct sca3000_state *st = indio_dev->dev_data; | |
247 | ||
248 | mutex_lock(&st->lock); | |
25888dc5 | 249 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1); |
574fb258 JC |
250 | if (ret < 0) |
251 | goto error_ret; | |
25888dc5 | 252 | if (st->rx[0] & SCA3000_EEPROM_CS_ERROR) |
26de7208 | 253 | dev_err(dev, "eeprom error\n"); |
25888dc5 | 254 | if (st->rx[0] & SCA3000_SPI_FRAME_ERROR) |
574fb258 | 255 | dev_err(dev, "Previous SPI Frame was corrupt\n"); |
574fb258 JC |
256 | |
257 | error_ret: | |
258 | mutex_unlock(&st->lock); | |
259 | return ret; | |
260 | } | |
261 | #endif /* SCA3000_DEBUG */ | |
262 | ||
574fb258 JC |
263 | static ssize_t sca3000_show_name(struct device *dev, |
264 | struct device_attribute *attr, | |
265 | char *buf) | |
266 | { | |
267 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
268 | struct sca3000_state *st = dev_info->dev_data; | |
269 | return sprintf(buf, "%s\n", st->info->name); | |
270 | } | |
271 | /** | |
272 | * sca3000_show_reg() - sysfs interface to read the chip revision number | |
273 | **/ | |
274 | static ssize_t sca3000_show_rev(struct device *dev, | |
275 | struct device_attribute *attr, | |
276 | char *buf) | |
277 | { | |
278 | int len = 0, ret; | |
279 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
280 | struct sca3000_state *st = dev_info->dev_data; | |
281 | ||
574fb258 | 282 | mutex_lock(&st->lock); |
25888dc5 | 283 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1); |
574fb258 JC |
284 | if (ret < 0) |
285 | goto error_ret; | |
286 | len += sprintf(buf + len, | |
287 | "major=%d, minor=%d\n", | |
25888dc5 JC |
288 | st->rx[0] & SCA3000_REVID_MAJOR_MASK, |
289 | st->rx[0] & SCA3000_REVID_MINOR_MASK); | |
574fb258 JC |
290 | error_ret: |
291 | mutex_unlock(&st->lock); | |
292 | ||
293 | return ret ? ret : len; | |
294 | } | |
295 | ||
296 | /** | |
297 | * sca3000_show_available_measurement_modes() display available modes | |
298 | * | |
299 | * This is all read from chip specific data in the driver. Not all | |
300 | * of the sca3000 series support modes other than normal. | |
301 | **/ | |
302 | static ssize_t | |
303 | sca3000_show_available_measurement_modes(struct device *dev, | |
304 | struct device_attribute *attr, | |
305 | char *buf) | |
306 | { | |
307 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
308 | struct sca3000_state *st = dev_info->dev_data; | |
309 | int len = 0; | |
310 | ||
311 | len += sprintf(buf + len, "0 - normal mode"); | |
312 | switch (st->info->option_mode_1) { | |
313 | case SCA3000_OP_MODE_NARROW: | |
314 | len += sprintf(buf + len, ", 1 - narrow mode"); | |
315 | break; | |
316 | case SCA3000_OP_MODE_BYPASS: | |
317 | len += sprintf(buf + len, ", 1 - bypass mode"); | |
318 | break; | |
c608cb01 | 319 | } |
574fb258 JC |
320 | switch (st->info->option_mode_2) { |
321 | case SCA3000_OP_MODE_WIDE: | |
322 | len += sprintf(buf + len, ", 2 - wide mode"); | |
323 | break; | |
324 | } | |
325 | /* always supported */ | |
26de7208 | 326 | len += sprintf(buf + len, " 3 - motion detection\n"); |
574fb258 JC |
327 | |
328 | return len; | |
329 | } | |
330 | ||
331 | /** | |
332 | * sca3000_show_measurmenet_mode() sysfs read of current mode | |
333 | **/ | |
334 | static ssize_t | |
335 | sca3000_show_measurement_mode(struct device *dev, | |
336 | struct device_attribute *attr, | |
337 | char *buf) | |
338 | { | |
339 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
340 | struct sca3000_state *st = dev_info->dev_data; | |
341 | int len = 0, ret; | |
574fb258 JC |
342 | |
343 | mutex_lock(&st->lock); | |
25888dc5 | 344 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
345 | if (ret) |
346 | goto error_ret; | |
347 | /* mask bottom 2 bits - only ones that are relevant */ | |
25888dc5 JC |
348 | st->rx[0] &= 0x03; |
349 | switch (st->rx[0]) { | |
574fb258 JC |
350 | case SCA3000_MEAS_MODE_NORMAL: |
351 | len += sprintf(buf + len, "0 - normal mode\n"); | |
352 | break; | |
353 | case SCA3000_MEAS_MODE_MOT_DET: | |
354 | len += sprintf(buf + len, "3 - motion detection\n"); | |
355 | break; | |
356 | case SCA3000_MEAS_MODE_OP_1: | |
357 | switch (st->info->option_mode_1) { | |
358 | case SCA3000_OP_MODE_NARROW: | |
359 | len += sprintf(buf + len, "1 - narrow mode\n"); | |
360 | break; | |
361 | case SCA3000_OP_MODE_BYPASS: | |
362 | len += sprintf(buf + len, "1 - bypass mode\n"); | |
363 | break; | |
c608cb01 | 364 | } |
574fb258 JC |
365 | break; |
366 | case SCA3000_MEAS_MODE_OP_2: | |
367 | switch (st->info->option_mode_2) { | |
368 | case SCA3000_OP_MODE_WIDE: | |
369 | len += sprintf(buf + len, "2 - wide mode\n"); | |
370 | break; | |
371 | } | |
372 | break; | |
c608cb01 | 373 | } |
574fb258 JC |
374 | |
375 | error_ret: | |
376 | mutex_unlock(&st->lock); | |
377 | ||
378 | return ret ? ret : len; | |
379 | } | |
380 | ||
381 | /** | |
382 | * sca3000_store_measurement_mode() set the current mode | |
383 | **/ | |
384 | static ssize_t | |
385 | sca3000_store_measurement_mode(struct device *dev, | |
386 | struct device_attribute *attr, | |
387 | const char *buf, | |
388 | size_t len) | |
389 | { | |
390 | struct iio_dev *dev_info = dev_get_drvdata(dev); | |
391 | struct sca3000_state *st = dev_info->dev_data; | |
392 | int ret; | |
574fb258 JC |
393 | int mask = 0x03; |
394 | long val; | |
395 | ||
396 | mutex_lock(&st->lock); | |
397 | ret = strict_strtol(buf, 10, &val); | |
398 | if (ret) | |
399 | goto error_ret; | |
25888dc5 | 400 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
401 | if (ret) |
402 | goto error_ret; | |
25888dc5 JC |
403 | st->rx[0] &= ~mask; |
404 | st->rx[0] |= (val & mask); | |
405 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]); | |
574fb258 | 406 | if (ret) |
25888dc5 | 407 | goto error_ret; |
574fb258 JC |
408 | mutex_unlock(&st->lock); |
409 | ||
410 | return len; | |
411 | ||
574fb258 JC |
412 | error_ret: |
413 | mutex_unlock(&st->lock); | |
414 | ||
415 | return ret; | |
416 | } | |
417 | ||
418 | ||
419 | /* Not even vaguely standard attributes so defined here rather than | |
420 | * in the relevant IIO core headers | |
421 | */ | |
f3fb0011 | 422 | static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO, |
574fb258 JC |
423 | sca3000_show_available_measurement_modes, |
424 | NULL, 0); | |
425 | ||
426 | static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR, | |
427 | sca3000_show_measurement_mode, | |
428 | sca3000_store_measurement_mode, | |
429 | 0); | |
430 | ||
431 | /* More standard attributes */ | |
432 | ||
433 | static IIO_DEV_ATTR_NAME(sca3000_show_name); | |
434 | static IIO_DEV_ATTR_REV(sca3000_show_rev); | |
435 | ||
25888dc5 JC |
436 | #define SCA3000_INFO_MASK \ |
437 | (1 << IIO_CHAN_INFO_SCALE_SHARED) | |
438 | #define SCA3000_EVENT_MASK \ | |
439 | (IIO_EV_BIT(IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING)) | |
440 | ||
441 | static struct iio_chan_spec sca3000_channels[] = { | |
442 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_X, SCA3000_INFO_MASK, | |
aaf370db | 443 | 0, 0, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 444 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Y, SCA3000_INFO_MASK, |
aaf370db | 445 | 1, 1, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 446 | IIO_CHAN(IIO_ACCEL, 1, 0, 0, NULL, 0, IIO_MOD_Z, SCA3000_INFO_MASK, |
aaf370db | 447 | 2, 2, IIO_ST('s', 11, 16, 5), SCA3000_EVENT_MASK), |
25888dc5 | 448 | }; |
574fb258 | 449 | |
25888dc5 JC |
450 | static u8 sca3000_addresses[3][3] = { |
451 | [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH, | |
452 | SCA3000_MD_CTRL_OR_X}, | |
453 | [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH, | |
454 | SCA3000_MD_CTRL_OR_Y}, | |
455 | [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH, | |
456 | SCA3000_MD_CTRL_OR_Z}, | |
457 | }; | |
458 | ||
459 | static int sca3000_read_raw(struct iio_dev *indio_dev, | |
460 | struct iio_chan_spec const *chan, | |
461 | int *val, | |
462 | int *val2, | |
463 | long mask) | |
464 | { | |
465 | struct sca3000_state *st = indio_dev->dev_data; | |
466 | int ret; | |
467 | u8 address; | |
468 | ||
469 | switch (mask) { | |
470 | case 0: | |
471 | mutex_lock(&st->lock); | |
472 | if (st->mo_det_use_count) { | |
473 | mutex_unlock(&st->lock); | |
474 | return -EBUSY; | |
475 | } | |
476 | address = sca3000_addresses[chan->address][0]; | |
477 | ret = sca3000_read_data_short(st, address, 2); | |
478 | if (ret < 0) { | |
479 | mutex_unlock(&st->lock); | |
480 | return ret; | |
481 | } | |
482 | *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF; | |
483 | *val = ((*val) << (sizeof(*val)*8 - 13)) >> | |
484 | (sizeof(*val)*8 - 13); | |
485 | mutex_unlock(&st->lock); | |
486 | return IIO_VAL_INT; | |
487 | case (1 << IIO_CHAN_INFO_SCALE_SHARED): | |
488 | *val = 0; | |
489 | if (chan->type == IIO_ACCEL) | |
490 | *val2 = st->info->scale; | |
491 | else /* temperature */ | |
492 | *val2 = 555556; | |
493 | return IIO_VAL_INT_PLUS_MICRO; | |
494 | default: | |
495 | return -EINVAL; | |
496 | } | |
497 | } | |
574fb258 JC |
498 | |
499 | /** | |
500 | * sca3000_read_av_freq() sysfs function to get available frequencies | |
501 | * | |
502 | * The later modes are only relevant to the ring buffer - and depend on current | |
503 | * mode. Note that data sheet gives rather wide tolerances for these so integer | |
504 | * division will give good enough answer and not all chips have them specified | |
505 | * at all. | |
506 | **/ | |
507 | static ssize_t sca3000_read_av_freq(struct device *dev, | |
508 | struct device_attribute *attr, | |
509 | char *buf) | |
510 | { | |
511 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
512 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 JC |
513 | int len = 0, ret, val; |
514 | ||
574fb258 | 515 | mutex_lock(&st->lock); |
25888dc5 JC |
516 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
517 | val = st->rx[0]; | |
574fb258 JC |
518 | mutex_unlock(&st->lock); |
519 | if (ret) | |
520 | goto error_ret; | |
25888dc5 JC |
521 | |
522 | switch (val & 0x03) { | |
574fb258 JC |
523 | case SCA3000_MEAS_MODE_NORMAL: |
524 | len += sprintf(buf + len, "%d %d %d\n", | |
525 | st->info->measurement_mode_freq, | |
526 | st->info->measurement_mode_freq/2, | |
527 | st->info->measurement_mode_freq/4); | |
528 | break; | |
529 | case SCA3000_MEAS_MODE_OP_1: | |
530 | len += sprintf(buf + len, "%d %d %d\n", | |
531 | st->info->option_mode_1_freq, | |
532 | st->info->option_mode_1_freq/2, | |
533 | st->info->option_mode_1_freq/4); | |
534 | break; | |
535 | case SCA3000_MEAS_MODE_OP_2: | |
536 | len += sprintf(buf + len, "%d %d %d\n", | |
537 | st->info->option_mode_2_freq, | |
538 | st->info->option_mode_2_freq/2, | |
539 | st->info->option_mode_2_freq/4); | |
540 | break; | |
c608cb01 | 541 | } |
574fb258 JC |
542 | return len; |
543 | error_ret: | |
544 | return ret; | |
545 | } | |
546 | /** | |
547 | * __sca3000_get_base_frequency() obtain mode specific base frequency | |
548 | * | |
549 | * lock must be held | |
550 | **/ | |
551 | static inline int __sca3000_get_base_freq(struct sca3000_state *st, | |
552 | const struct sca3000_chip_info *info, | |
553 | int *base_freq) | |
554 | { | |
555 | int ret; | |
574fb258 | 556 | |
25888dc5 | 557 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
558 | if (ret) |
559 | goto error_ret; | |
25888dc5 | 560 | switch (0x03 & st->rx[0]) { |
574fb258 JC |
561 | case SCA3000_MEAS_MODE_NORMAL: |
562 | *base_freq = info->measurement_mode_freq; | |
563 | break; | |
564 | case SCA3000_MEAS_MODE_OP_1: | |
565 | *base_freq = info->option_mode_1_freq; | |
566 | break; | |
567 | case SCA3000_MEAS_MODE_OP_2: | |
568 | *base_freq = info->option_mode_2_freq; | |
569 | break; | |
c608cb01 | 570 | } |
574fb258 JC |
571 | error_ret: |
572 | return ret; | |
573 | } | |
574 | ||
575 | /** | |
576 | * sca3000_read_frequency() sysfs interface to get the current frequency | |
577 | **/ | |
578 | static ssize_t sca3000_read_frequency(struct device *dev, | |
579 | struct device_attribute *attr, | |
580 | char *buf) | |
581 | { | |
582 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
583 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 JC |
584 | int ret, len = 0, base_freq = 0, val; |
585 | ||
574fb258 JC |
586 | mutex_lock(&st->lock); |
587 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
588 | if (ret) | |
589 | goto error_ret_mut; | |
25888dc5 | 590 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
574fb258 JC |
591 | mutex_unlock(&st->lock); |
592 | if (ret) | |
593 | goto error_ret; | |
25888dc5 | 594 | val = ret; |
574fb258 | 595 | if (base_freq > 0) |
25888dc5 | 596 | switch (val & 0x03) { |
574fb258 JC |
597 | case 0x00: |
598 | case 0x03: | |
599 | len = sprintf(buf, "%d\n", base_freq); | |
600 | break; | |
601 | case 0x01: | |
602 | len = sprintf(buf, "%d\n", base_freq/2); | |
603 | break; | |
604 | case 0x02: | |
605 | len = sprintf(buf, "%d\n", base_freq/4); | |
606 | break; | |
c608cb01 | 607 | } |
25888dc5 | 608 | |
574fb258 JC |
609 | return len; |
610 | error_ret_mut: | |
611 | mutex_unlock(&st->lock); | |
612 | error_ret: | |
613 | return ret; | |
614 | } | |
615 | ||
616 | /** | |
617 | * sca3000_set_frequency() sysfs interface to set the current frequency | |
618 | **/ | |
619 | static ssize_t sca3000_set_frequency(struct device *dev, | |
620 | struct device_attribute *attr, | |
621 | const char *buf, | |
622 | size_t len) | |
623 | { | |
624 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
625 | struct sca3000_state *st = indio_dev->dev_data; | |
626 | int ret, base_freq = 0; | |
25888dc5 | 627 | int ctrlval; |
574fb258 JC |
628 | long val; |
629 | ||
630 | ret = strict_strtol(buf, 10, &val); | |
631 | if (ret) | |
632 | return ret; | |
633 | ||
634 | mutex_lock(&st->lock); | |
635 | /* What mode are we in? */ | |
636 | ret = __sca3000_get_base_freq(st, st->info, &base_freq); | |
637 | if (ret) | |
638 | goto error_free_lock; | |
639 | ||
25888dc5 JC |
640 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
641 | if (ret < 0) | |
574fb258 | 642 | goto error_free_lock; |
25888dc5 | 643 | ctrlval = ret; |
574fb258 | 644 | /* clear the bits */ |
25888dc5 | 645 | ctrlval &= ~0x03; |
574fb258 JC |
646 | |
647 | if (val == base_freq/2) { | |
25888dc5 | 648 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2; |
574fb258 | 649 | } else if (val == base_freq/4) { |
25888dc5 | 650 | ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4; |
574fb258 JC |
651 | } else if (val != base_freq) { |
652 | ret = -EINVAL; | |
653 | goto error_free_lock; | |
654 | } | |
25888dc5 JC |
655 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, |
656 | ctrlval); | |
574fb258 JC |
657 | error_free_lock: |
658 | mutex_unlock(&st->lock); | |
659 | ||
660 | return ret ? ret : len; | |
661 | } | |
662 | ||
663 | /* Should only really be registered if ring buffer support is compiled in. | |
664 | * Does no harm however and doing it right would add a fair bit of complexity | |
665 | */ | |
f3fb0011 | 666 | static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq); |
574fb258 JC |
667 | |
668 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
669 | sca3000_read_frequency, | |
670 | sca3000_set_frequency); | |
671 | ||
672 | ||
673 | /** | |
674 | * sca3000_read_temp() sysfs interface to get the temperature when available | |
675 | * | |
676 | * The alignment of data in here is downright odd. See data sheet. | |
677 | * Converting this into a meaningful value is left to inline functions in | |
678 | * userspace part of header. | |
679 | **/ | |
680 | static ssize_t sca3000_read_temp(struct device *dev, | |
681 | struct device_attribute *attr, | |
682 | char *buf) | |
683 | { | |
684 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
685 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 | 686 | int ret; |
574fb258 | 687 | int val; |
25888dc5 | 688 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2); |
574fb258 JC |
689 | if (ret < 0) |
690 | goto error_ret; | |
25888dc5 | 691 | val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5); |
574fb258 | 692 | |
25888dc5 | 693 | return sprintf(buf, "%d\n", val); |
574fb258 JC |
694 | |
695 | error_ret: | |
696 | return ret; | |
697 | } | |
f3fb0011 JC |
698 | static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp); |
699 | ||
51a0a5b0 MS |
700 | static IIO_CONST_ATTR_TEMP_SCALE("0.555556"); |
701 | static IIO_CONST_ATTR_TEMP_OFFSET("-214.6"); | |
574fb258 JC |
702 | |
703 | /** | |
25888dc5 | 704 | * sca3000_read_thresh() - query of a threshold |
574fb258 | 705 | **/ |
25888dc5 JC |
706 | static int sca3000_read_thresh(struct iio_dev *indio_dev, |
707 | int e, | |
708 | int *val) | |
574fb258 | 709 | { |
25888dc5 | 710 | int ret, i; |
574fb258 | 711 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 712 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 713 | mutex_lock(&st->lock); |
25888dc5 | 714 | ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]); |
574fb258 | 715 | mutex_unlock(&st->lock); |
25888dc5 | 716 | if (ret < 0) |
574fb258 | 717 | return ret; |
25888dc5 JC |
718 | *val = 0; |
719 | if (num == 1) | |
720 | for_each_set_bit(i, (unsigned long *)&ret, | |
721 | ARRAY_SIZE(st->info->mot_det_mult_y)) | |
722 | *val += st->info->mot_det_mult_y[i]; | |
723 | else | |
724 | for_each_set_bit(i, (unsigned long *)&ret, | |
725 | ARRAY_SIZE(st->info->mot_det_mult_xz)) | |
726 | *val += st->info->mot_det_mult_xz[i]; | |
574fb258 | 727 | |
25888dc5 | 728 | return 0; |
574fb258 JC |
729 | } |
730 | ||
731 | /** | |
25888dc5 | 732 | * sca3000_write_thresh() control of threshold |
574fb258 | 733 | **/ |
25888dc5 JC |
734 | static int sca3000_write_thresh(struct iio_dev *indio_dev, |
735 | int e, | |
736 | int val) | |
574fb258 | 737 | { |
574fb258 | 738 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 739 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 | 740 | int ret; |
25888dc5 JC |
741 | int i; |
742 | u8 nonlinear = 0; | |
743 | ||
744 | if (num == 1) { | |
745 | i = ARRAY_SIZE(st->info->mot_det_mult_y); | |
746 | while (i > 0) | |
747 | if (val >= st->info->mot_det_mult_y[--i]) { | |
748 | nonlinear |= (1 << i); | |
749 | val -= st->info->mot_det_mult_y[i]; | |
750 | } | |
751 | } else { | |
752 | i = ARRAY_SIZE(st->info->mot_det_mult_xz); | |
753 | while (i > 0) | |
754 | if (val >= st->info->mot_det_mult_xz[--i]) { | |
755 | nonlinear |= (1 << i); | |
756 | val -= st->info->mot_det_mult_xz[i]; | |
757 | } | |
758 | } | |
574fb258 | 759 | |
574fb258 | 760 | mutex_lock(&st->lock); |
25888dc5 | 761 | ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear); |
574fb258 JC |
762 | mutex_unlock(&st->lock); |
763 | ||
25888dc5 | 764 | return ret; |
574fb258 JC |
765 | } |
766 | ||
574fb258 JC |
767 | static struct attribute *sca3000_attributes[] = { |
768 | &iio_dev_attr_name.dev_attr.attr, | |
769 | &iio_dev_attr_revision.dev_attr.attr, | |
f3fb0011 | 770 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 771 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 772 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
773 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
774 | NULL, | |
775 | }; | |
776 | ||
777 | static struct attribute *sca3000_attributes_with_temp[] = { | |
778 | &iio_dev_attr_name.dev_attr.attr, | |
779 | &iio_dev_attr_revision.dev_attr.attr, | |
f3fb0011 | 780 | &iio_dev_attr_measurement_mode_available.dev_attr.attr, |
574fb258 | 781 | &iio_dev_attr_measurement_mode.dev_attr.attr, |
f3fb0011 | 782 | &iio_dev_attr_sampling_frequency_available.dev_attr.attr, |
574fb258 JC |
783 | &iio_dev_attr_sampling_frequency.dev_attr.attr, |
784 | /* Only present if temp sensor is */ | |
f3fb0011 JC |
785 | &iio_dev_attr_temp_raw.dev_attr.attr, |
786 | &iio_const_attr_temp_offset.dev_attr.attr, | |
787 | &iio_const_attr_temp_scale.dev_attr.attr, | |
574fb258 JC |
788 | NULL, |
789 | }; | |
790 | ||
791 | static const struct attribute_group sca3000_attribute_group = { | |
792 | .attrs = sca3000_attributes, | |
793 | }; | |
794 | ||
795 | static const struct attribute_group sca3000_attribute_group_with_temp = { | |
796 | .attrs = sca3000_attributes_with_temp, | |
797 | }; | |
798 | ||
799 | /* RING RELATED interrupt handler */ | |
800 | /* depending on event, push to the ring buffer event chrdev or the event one */ | |
801 | ||
802 | /** | |
25888dc5 | 803 | * sca3000_event_handler() - handling ring and non ring events |
574fb258 JC |
804 | * |
805 | * This function is complicated by the fact that the devices can signify ring | |
806 | * and non ring events via the same interrupt line and they can only | |
807 | * be distinguished via a read of the relevant status register. | |
808 | **/ | |
25888dc5 | 809 | static irqreturn_t sca3000_event_handler(int irq, void *private) |
574fb258 | 810 | { |
25888dc5 JC |
811 | struct iio_dev *indio_dev = private; |
812 | struct sca3000_state *st; | |
813 | int ret, val; | |
814 | s64 last_timestamp = iio_get_time_ns(); | |
574fb258 | 815 | |
25888dc5 | 816 | st = indio_dev->dev_data; |
574fb258 JC |
817 | /* Could lead if badly timed to an extra read of status reg, |
818 | * but ensures no interrupt is missed. | |
819 | */ | |
574fb258 | 820 | mutex_lock(&st->lock); |
25888dc5 JC |
821 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
822 | val = st->rx[0]; | |
574fb258 JC |
823 | mutex_unlock(&st->lock); |
824 | if (ret) | |
825 | goto done; | |
826 | ||
25888dc5 | 827 | sca3000_ring_int_process(val, st->indio_dev->ring); |
574fb258 | 828 | |
25888dc5 | 829 | if (val & SCA3000_INT_STATUS_FREE_FALL) |
574fb258 | 830 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
831 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
832 | 0, | |
833 | IIO_EV_MOD_X_AND_Y_AND_Z, | |
834 | IIO_EV_TYPE_MAG, | |
835 | IIO_EV_DIR_FALLING), | |
25888dc5 | 836 | last_timestamp); |
574fb258 | 837 | |
25888dc5 | 838 | if (val & SCA3000_INT_STATUS_Y_TRIGGER) |
574fb258 | 839 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
840 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
841 | 0, | |
842 | IIO_EV_MOD_Y, | |
843 | IIO_EV_TYPE_MAG, | |
844 | IIO_EV_DIR_RISING), | |
25888dc5 | 845 | last_timestamp); |
574fb258 | 846 | |
25888dc5 | 847 | if (val & SCA3000_INT_STATUS_X_TRIGGER) |
574fb258 | 848 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
849 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
850 | 0, | |
851 | IIO_EV_MOD_X, | |
852 | IIO_EV_TYPE_MAG, | |
853 | IIO_EV_DIR_RISING), | |
25888dc5 | 854 | last_timestamp); |
574fb258 | 855 | |
25888dc5 | 856 | if (val & SCA3000_INT_STATUS_Z_TRIGGER) |
574fb258 | 857 | iio_push_event(st->indio_dev, 0, |
de9fe32a JC |
858 | IIO_MOD_EVENT_CODE(IIO_EV_CLASS_ACCEL, |
859 | 0, | |
860 | IIO_EV_MOD_Z, | |
861 | IIO_EV_TYPE_MAG, | |
862 | IIO_EV_DIR_RISING), | |
25888dc5 | 863 | last_timestamp); |
574fb258 JC |
864 | |
865 | done: | |
25888dc5 | 866 | return IRQ_HANDLED; |
574fb258 JC |
867 | } |
868 | ||
869 | /** | |
25888dc5 | 870 | * sca3000_read_event_config() what events are enabled |
574fb258 | 871 | **/ |
25888dc5 JC |
872 | static int sca3000_read_event_config(struct iio_dev *indio_dev, |
873 | int e) | |
574fb258 | 874 | { |
574fb258 | 875 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 876 | int ret; |
574fb258 | 877 | u8 protect_mask = 0x03; |
25888dc5 | 878 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
879 | |
880 | /* read current value of mode register */ | |
881 | mutex_lock(&st->lock); | |
25888dc5 | 882 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
883 | if (ret) |
884 | goto error_ret; | |
885 | ||
25888dc5 JC |
886 | if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET) |
887 | ret = 0; | |
574fb258 | 888 | else { |
25888dc5 JC |
889 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
890 | if (ret < 0) | |
574fb258 JC |
891 | goto error_ret; |
892 | /* only supporting logical or's for now */ | |
25888dc5 | 893 | ret = !!(ret & sca3000_addresses[num][2]); |
574fb258 | 894 | } |
574fb258 JC |
895 | error_ret: |
896 | mutex_unlock(&st->lock); | |
897 | ||
25888dc5 | 898 | return ret; |
574fb258 JC |
899 | } |
900 | /** | |
901 | * sca3000_query_free_fall_mode() is free fall mode enabled | |
902 | **/ | |
903 | static ssize_t sca3000_query_free_fall_mode(struct device *dev, | |
904 | struct device_attribute *attr, | |
905 | char *buf) | |
906 | { | |
907 | int ret, len; | |
574fb258 JC |
908 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
909 | struct sca3000_state *st = indio_dev->dev_data; | |
25888dc5 | 910 | int val; |
574fb258 JC |
911 | |
912 | mutex_lock(&st->lock); | |
25888dc5 JC |
913 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
914 | val = st->rx[0]; | |
574fb258 | 915 | mutex_unlock(&st->lock); |
25888dc5 | 916 | if (ret < 0) |
574fb258 JC |
917 | return ret; |
918 | len = sprintf(buf, "%d\n", | |
25888dc5 | 919 | !!(val & SCA3000_FREE_FALL_DETECT)); |
574fb258 JC |
920 | return len; |
921 | } | |
574fb258 JC |
922 | |
923 | /** | |
924 | * sca3000_set_free_fall_mode() simple on off control for free fall int | |
925 | * | |
926 | * In these chips the free fall detector should send an interrupt if | |
927 | * the device falls more than 25cm. This has not been tested due | |
928 | * to fragile wiring. | |
929 | **/ | |
930 | ||
931 | static ssize_t sca3000_set_free_fall_mode(struct device *dev, | |
932 | struct device_attribute *attr, | |
933 | const char *buf, | |
934 | size_t len) | |
935 | { | |
936 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
937 | struct sca3000_state *st = indio_dev->dev_data; | |
938 | long val; | |
939 | int ret; | |
574fb258 JC |
940 | u8 protect_mask = SCA3000_FREE_FALL_DETECT; |
941 | ||
942 | mutex_lock(&st->lock); | |
943 | ret = strict_strtol(buf, 10, &val); | |
944 | if (ret) | |
945 | goto error_ret; | |
946 | ||
947 | /* read current value of mode register */ | |
25888dc5 | 948 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
949 | if (ret) |
950 | goto error_ret; | |
951 | ||
952 | /*if off and should be on*/ | |
25888dc5 | 953 | if (val && !(st->rx[0] & protect_mask)) |
574fb258 | 954 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 955 | (st->rx[0] | SCA3000_FREE_FALL_DETECT)); |
574fb258 | 956 | /* if on and should be off */ |
25888dc5 | 957 | else if (!val && (st->rx[0] & protect_mask)) |
574fb258 | 958 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 959 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
960 | error_ret: |
961 | mutex_unlock(&st->lock); | |
962 | ||
963 | return ret ? ret : len; | |
964 | } | |
965 | ||
966 | /** | |
967 | * sca3000_set_mo_det() simple on off control for motion detector | |
968 | * | |
969 | * This is a per axis control, but enabling any will result in the | |
970 | * motion detector unit being enabled. | |
971 | * N.B. enabling motion detector stops normal data acquisition. | |
972 | * There is a complexity in knowing which mode to return to when | |
973 | * this mode is disabled. Currently normal mode is assumed. | |
974 | **/ | |
25888dc5 JC |
975 | static int sca3000_write_event_config(struct iio_dev *indio_dev, |
976 | int e, | |
25888dc5 | 977 | int state) |
574fb258 | 978 | { |
574fb258 | 979 | struct sca3000_state *st = indio_dev->dev_data; |
25888dc5 | 980 | int ret, ctrlval; |
574fb258 | 981 | u8 protect_mask = 0x03; |
25888dc5 | 982 | int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e); |
574fb258 JC |
983 | |
984 | mutex_lock(&st->lock); | |
985 | /* First read the motion detector config to find out if | |
986 | * this axis is on*/ | |
25888dc5 JC |
987 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
988 | if (ret < 0) | |
574fb258 | 989 | goto exit_point; |
25888dc5 | 990 | ctrlval = ret; |
574fb258 | 991 | /* Off and should be on */ |
25888dc5 | 992 | if (state && !(ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
993 | ret = sca3000_write_ctrl_reg(st, |
994 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
995 | ctrlval | |
996 | sca3000_addresses[num][2]); | |
574fb258 | 997 | if (ret) |
25888dc5 | 998 | goto exit_point; |
574fb258 | 999 | st->mo_det_use_count++; |
25888dc5 | 1000 | } else if (!state && (ctrlval & sca3000_addresses[num][2])) { |
574fb258 JC |
1001 | ret = sca3000_write_ctrl_reg(st, |
1002 | SCA3000_REG_CTRL_SEL_MD_CTRL, | |
25888dc5 JC |
1003 | ctrlval & |
1004 | ~(sca3000_addresses[num][2])); | |
574fb258 | 1005 | if (ret) |
25888dc5 | 1006 | goto exit_point; |
574fb258 | 1007 | st->mo_det_use_count--; |
25888dc5 JC |
1008 | } |
1009 | ||
574fb258 | 1010 | /* read current value of mode register */ |
25888dc5 | 1011 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1012 | if (ret) |
1013 | goto exit_point; | |
1014 | /*if off and should be on*/ | |
1015 | if ((st->mo_det_use_count) | |
25888dc5 | 1016 | && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1017 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1018 | (st->rx[0] & ~protect_mask) |
574fb258 JC |
1019 | | SCA3000_MEAS_MODE_MOT_DET); |
1020 | /* if on and should be off */ | |
1021 | else if (!(st->mo_det_use_count) | |
25888dc5 | 1022 | && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET)) |
574fb258 | 1023 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
25888dc5 | 1024 | (st->rx[0] & ~protect_mask)); |
574fb258 JC |
1025 | exit_point: |
1026 | mutex_unlock(&st->lock); | |
1027 | ||
25888dc5 | 1028 | return ret; |
574fb258 JC |
1029 | } |
1030 | ||
574fb258 | 1031 | /* Free fall detector related event attribute */ |
aaf370db JC |
1032 | static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en, |
1033 | accel_x&y&z_mag_falling_en, | |
1034 | S_IRUGO | S_IWUSR, | |
1035 | sca3000_query_free_fall_mode, | |
1036 | sca3000_set_free_fall_mode, | |
1037 | 0); | |
fc5d0e42 | 1038 | |
25888dc5 JC |
1039 | static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period, |
1040 | accel_x&y&z_mag_falling_period, | |
1041 | "0.226"); | |
574fb258 JC |
1042 | |
1043 | static struct attribute *sca3000_event_attributes[] = { | |
aaf370db | 1044 | &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr, |
fc5d0e42 | 1045 | &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr, |
574fb258 JC |
1046 | NULL, |
1047 | }; | |
1048 | ||
1049 | static struct attribute_group sca3000_event_attribute_group = { | |
1050 | .attrs = sca3000_event_attributes, | |
1051 | }; | |
1052 | ||
1053 | /** | |
1054 | * sca3000_clean_setup() get the device into a predictable state | |
1055 | * | |
1056 | * Devices use flash memory to store many of the register values | |
1057 | * and hence can come up in somewhat unpredictable states. | |
1058 | * Hence reset everything on driver load. | |
1059 | **/ | |
1060 | static int sca3000_clean_setup(struct sca3000_state *st) | |
1061 | { | |
1062 | int ret; | |
574fb258 JC |
1063 | |
1064 | mutex_lock(&st->lock); | |
1065 | /* Ensure all interrupts have been acknowledged */ | |
25888dc5 | 1066 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1); |
574fb258 JC |
1067 | if (ret) |
1068 | goto error_ret; | |
574fb258 JC |
1069 | |
1070 | /* Turn off all motion detection channels */ | |
25888dc5 JC |
1071 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL); |
1072 | if (ret < 0) | |
574fb258 | 1073 | goto error_ret; |
25888dc5 JC |
1074 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL, |
1075 | ret & SCA3000_MD_CTRL_PROT_MASK); | |
574fb258 JC |
1076 | if (ret) |
1077 | goto error_ret; | |
1078 | ||
1079 | /* Disable ring buffer */ | |
25888dc5 JC |
1080 | ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL); |
1081 | ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL, | |
1082 | (ret & SCA3000_OUT_CTRL_PROT_MASK) | |
574fb258 JC |
1083 | | SCA3000_OUT_CTRL_BUF_X_EN |
1084 | | SCA3000_OUT_CTRL_BUF_Y_EN | |
1085 | | SCA3000_OUT_CTRL_BUF_Z_EN | |
1086 | | SCA3000_OUT_CTRL_BUF_DIV_4); | |
574fb258 JC |
1087 | if (ret) |
1088 | goto error_ret; | |
1089 | /* Enable interrupts, relevant to mode and set up as active low */ | |
25888dc5 | 1090 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1091 | if (ret) |
1092 | goto error_ret; | |
1093 | ret = sca3000_write_reg(st, | |
1094 | SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 | 1095 | (ret & SCA3000_INT_MASK_PROT_MASK) |
574fb258 | 1096 | | SCA3000_INT_MASK_ACTIVE_LOW); |
574fb258 JC |
1097 | if (ret) |
1098 | goto error_ret; | |
1099 | /* Select normal measurement mode, free fall off, ring off */ | |
1100 | /* Ring in 12 bit mode - it is fine to overwrite reserved bits 3,5 | |
1101 | * as that occurs in one of the example on the datasheet */ | |
25888dc5 | 1102 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1); |
574fb258 JC |
1103 | if (ret) |
1104 | goto error_ret; | |
25888dc5 JC |
1105 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, |
1106 | (st->rx[0] & SCA3000_MODE_PROT_MASK)); | |
574fb258 JC |
1107 | st->bpse = 11; |
1108 | ||
1109 | error_ret: | |
1110 | mutex_unlock(&st->lock); | |
1111 | return ret; | |
1112 | } | |
1113 | ||
25888dc5 | 1114 | static int __devinit sca3000_probe(struct spi_device *spi) |
574fb258 JC |
1115 | { |
1116 | int ret, regdone = 0; | |
1117 | struct sca3000_state *st; | |
1118 | ||
1119 | st = kzalloc(sizeof(struct sca3000_state), GFP_KERNEL); | |
1120 | if (st == NULL) { | |
1121 | ret = -ENOMEM; | |
1122 | goto error_ret; | |
1123 | } | |
1124 | spi_set_drvdata(spi, st); | |
1125 | ||
574fb258 JC |
1126 | st->us = spi; |
1127 | mutex_init(&st->lock); | |
25888dc5 JC |
1128 | st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi) |
1129 | ->driver_data]; | |
574fb258 | 1130 | |
6f7c8ee5 | 1131 | st->indio_dev = iio_allocate_device(0); |
574fb258 JC |
1132 | if (st->indio_dev == NULL) { |
1133 | ret = -ENOMEM; | |
25888dc5 | 1134 | goto error_clear_st; |
574fb258 | 1135 | } |
574fb258 JC |
1136 | st->indio_dev->dev.parent = &spi->dev; |
1137 | st->indio_dev->num_interrupt_lines = 1; | |
1138 | st->indio_dev->event_attrs = &sca3000_event_attribute_group; | |
1139 | if (st->info->temp_output) | |
1140 | st->indio_dev->attrs = &sca3000_attribute_group_with_temp; | |
25888dc5 | 1141 | else { |
574fb258 | 1142 | st->indio_dev->attrs = &sca3000_attribute_group; |
25888dc5 JC |
1143 | st->indio_dev->channels = sca3000_channels; |
1144 | st->indio_dev->num_channels = ARRAY_SIZE(sca3000_channels); | |
1145 | } | |
1146 | st->indio_dev->read_raw = &sca3000_read_raw; | |
1147 | st->indio_dev->read_event_value = &sca3000_read_thresh; | |
1148 | st->indio_dev->write_event_value = &sca3000_write_thresh; | |
1149 | st->indio_dev->read_event_config = &sca3000_read_event_config; | |
1150 | st->indio_dev->write_event_config = &sca3000_write_event_config; | |
574fb258 JC |
1151 | st->indio_dev->dev_data = (void *)(st); |
1152 | st->indio_dev->modes = INDIO_DIRECT_MODE; | |
1153 | ||
1154 | sca3000_configure_ring(st->indio_dev); | |
574fb258 JC |
1155 | ret = iio_device_register(st->indio_dev); |
1156 | if (ret < 0) | |
1157 | goto error_free_dev; | |
1158 | regdone = 1; | |
25888dc5 JC |
1159 | ret = iio_ring_buffer_register_ex(st->indio_dev->ring, 0, |
1160 | sca3000_channels, | |
1161 | ARRAY_SIZE(sca3000_channels)); | |
574fb258 JC |
1162 | if (ret < 0) |
1163 | goto error_unregister_dev; | |
1164 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) { | |
25888dc5 JC |
1165 | ret = request_threaded_irq(spi->irq, |
1166 | NULL, | |
1167 | &sca3000_event_handler, | |
1168 | IRQF_TRIGGER_FALLING, | |
1169 | "sca3000", | |
1170 | st->indio_dev); | |
574fb258 JC |
1171 | if (ret) |
1172 | goto error_unregister_ring; | |
574fb258 JC |
1173 | } |
1174 | sca3000_register_ring_funcs(st->indio_dev); | |
1175 | ret = sca3000_clean_setup(st); | |
1176 | if (ret) | |
25888dc5 | 1177 | goto error_free_irq; |
574fb258 JC |
1178 | return 0; |
1179 | ||
25888dc5 | 1180 | error_free_irq: |
574fb258 | 1181 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) |
25888dc5 | 1182 | free_irq(spi->irq, st->indio_dev); |
574fb258 JC |
1183 | error_unregister_ring: |
1184 | iio_ring_buffer_unregister(st->indio_dev->ring); | |
1185 | error_unregister_dev: | |
1186 | error_free_dev: | |
1187 | if (regdone) | |
1188 | iio_device_unregister(st->indio_dev); | |
1189 | else | |
1190 | iio_free_device(st->indio_dev); | |
574fb258 JC |
1191 | error_clear_st: |
1192 | kfree(st); | |
1193 | error_ret: | |
1194 | return ret; | |
1195 | } | |
1196 | ||
1197 | static int sca3000_stop_all_interrupts(struct sca3000_state *st) | |
1198 | { | |
1199 | int ret; | |
574fb258 JC |
1200 | |
1201 | mutex_lock(&st->lock); | |
25888dc5 | 1202 | ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1); |
574fb258 JC |
1203 | if (ret) |
1204 | goto error_ret; | |
1205 | ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK, | |
25888dc5 JC |
1206 | (st->rx[0] & |
1207 | ~(SCA3000_INT_MASK_RING_THREE_QUARTER | | |
1208 | SCA3000_INT_MASK_RING_HALF | | |
1209 | SCA3000_INT_MASK_ALL_INTS))); | |
574fb258 | 1210 | error_ret: |
25888dc5 | 1211 | mutex_unlock(&st->lock); |
574fb258 | 1212 | return ret; |
574fb258 JC |
1213 | } |
1214 | ||
1215 | static int sca3000_remove(struct spi_device *spi) | |
1216 | { | |
1217 | struct sca3000_state *st = spi_get_drvdata(spi); | |
1218 | struct iio_dev *indio_dev = st->indio_dev; | |
1219 | int ret; | |
1220 | /* Must ensure no interrupts can be generated after this!*/ | |
1221 | ret = sca3000_stop_all_interrupts(st); | |
1222 | if (ret) | |
1223 | return ret; | |
1224 | if (spi->irq && gpio_is_valid(irq_to_gpio(spi->irq)) > 0) | |
25888dc5 | 1225 | free_irq(spi->irq, indio_dev); |
574fb258 JC |
1226 | iio_ring_buffer_unregister(indio_dev->ring); |
1227 | sca3000_unconfigure_ring(indio_dev); | |
1228 | iio_device_unregister(indio_dev); | |
1229 | ||
574fb258 JC |
1230 | kfree(st); |
1231 | ||
1232 | return 0; | |
1233 | } | |
1234 | ||
25888dc5 JC |
1235 | static const struct spi_device_id sca3000_id[] = { |
1236 | {"sca3000_d01", d01}, | |
1237 | {"sca3000_e02", e02}, | |
1238 | {"sca3000_e04", e04}, | |
1239 | {"sca3000_e05", e05}, | |
1240 | {} | |
1241 | }; | |
574fb258 | 1242 | |
25888dc5 JC |
1243 | static struct spi_driver sca3000_driver = { |
1244 | .driver = { | |
1245 | .name = "sca3000", | |
1246 | .owner = THIS_MODULE, | |
1247 | }, | |
1248 | .probe = sca3000_probe, | |
1249 | .remove = __devexit_p(sca3000_remove), | |
1250 | .id_table = sca3000_id, | |
1251 | }; | |
574fb258 | 1252 | |
574fb258 JC |
1253 | static __init int sca3000_init(void) |
1254 | { | |
25888dc5 | 1255 | return spi_register_driver(&sca3000_driver); |
574fb258 | 1256 | } |
25888dc5 | 1257 | module_init(sca3000_init); |
574fb258 JC |
1258 | |
1259 | static __exit void sca3000_exit(void) | |
1260 | { | |
25888dc5 | 1261 | spi_unregister_driver(&sca3000_driver); |
574fb258 | 1262 | } |
574fb258 JC |
1263 | module_exit(sca3000_exit); |
1264 | ||
1265 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
1266 | MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver"); | |
1267 | MODULE_LICENSE("GPL v2"); |