1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* |
3 | * comedi/drivers/dt9812.c |
4 | * COMEDI driver for DataTranslation DT9812 USB module |
5 | * |
6 | * Copyright (C) 2005 Anders Blomdell <anders.blomdell@control.lth.se> |
7 | * |
8 | * COMEDI - Linux Control and Measurement Device Interface |
9 | */ |
10 | |
11 | /* |
12 | * Driver: dt9812 |
13 | * Description: Data Translation DT9812 USB module |
14 | * Devices: [Data Translation] DT9812 (dt9812) |
15 | * Author: anders.blomdell@control.lth.se (Anders Blomdell) |
16 | * Status: in development |
17 | * Updated: Sun Nov 20 20:18:34 EST 2005 |
18 | * |
19 | * This driver works, but bulk transfers not implemented. Might be a |
20 | * starting point for someone else. I found out too late that USB has |
21 | * too high latencies (>1 ms) for my needs. |
22 | */ |
23 | |
24 | /* |
25 | * Nota Bene: |
26 | * 1. All writes to command pipe has to be 32 bytes (ISP1181B SHRTP=0 ?) |
27 | * 2. The DDK source (as of sep 2005) is in error regarding the |
28 | * input MUX bits (example code says P4, but firmware schematics |
29 | * says P1). |
30 | */ |
31 | |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> |
34 | #include <linux/errno.h> |
35 | #include <linux/slab.h> |
36 | #include <linux/uaccess.h> |
37 | #include <linux/comedi/comedi_usb.h> |
38 | |
39 | #define DT9812_DIAGS_BOARD_INFO_ADDR 0xFBFF |
40 | #define DT9812_MAX_WRITE_CMD_PIPE_SIZE 32 |
41 | #define DT9812_MAX_READ_CMD_PIPE_SIZE 32 |
42 | |
43 | /* usb_bulk_msg() timeout in milliseconds */ |
44 | #define DT9812_USB_TIMEOUT 1000 |
45 | |
46 | /* |
47 | * See Silican Laboratories C8051F020/1/2/3 manual |
48 | */ |
49 | #define F020_SFR_P4 0x84 |
50 | #define F020_SFR_P1 0x90 |
51 | #define F020_SFR_P2 0xa0 |
52 | #define F020_SFR_P3 0xb0 |
53 | #define F020_SFR_AMX0CF 0xba |
54 | #define F020_SFR_AMX0SL 0xbb |
55 | #define F020_SFR_ADC0CF 0xbc |
56 | #define F020_SFR_ADC0L 0xbe |
57 | #define F020_SFR_ADC0H 0xbf |
58 | #define F020_SFR_DAC0L 0xd2 |
59 | #define F020_SFR_DAC0H 0xd3 |
60 | #define F020_SFR_DAC0CN 0xd4 |
61 | #define F020_SFR_DAC1L 0xd5 |
62 | #define F020_SFR_DAC1H 0xd6 |
63 | #define F020_SFR_DAC1CN 0xd7 |
64 | #define F020_SFR_ADC0CN 0xe8 |
65 | |
66 | #define F020_MASK_ADC0CF_AMP0GN0 0x01 |
67 | #define F020_MASK_ADC0CF_AMP0GN1 0x02 |
68 | #define F020_MASK_ADC0CF_AMP0GN2 0x04 |
69 | |
70 | #define F020_MASK_ADC0CN_AD0EN 0x80 |
71 | #define F020_MASK_ADC0CN_AD0INT 0x20 |
72 | #define F020_MASK_ADC0CN_AD0BUSY 0x10 |
73 | |
74 | #define F020_MASK_DACXCN_DACXEN 0x80 |
75 | |
76 | enum { |
77 | /* A/D D/A DI DO CT */ |
78 | DT9812_DEVID_DT9812_10, /* 8 2 8 8 1 +/- 10V */ |
79 | DT9812_DEVID_DT9812_2PT5, /* 8 2 8 8 1 0-2.44V */ |
80 | }; |
81 | |
82 | enum dt9812_gain { |
83 | DT9812_GAIN_0PT25 = 1, |
84 | DT9812_GAIN_0PT5 = 2, |
85 | DT9812_GAIN_1 = 4, |
86 | DT9812_GAIN_2 = 8, |
87 | DT9812_GAIN_4 = 16, |
88 | DT9812_GAIN_8 = 32, |
89 | DT9812_GAIN_16 = 64, |
90 | }; |
91 | |
92 | enum { |
93 | DT9812_LEAST_USB_FIRMWARE_CMD_CODE = 0, |
94 | /* Write Flash memory */ |
95 | DT9812_W_FLASH_DATA = 0, |
96 | /* Read Flash memory misc config info */ |
97 | DT9812_R_FLASH_DATA = 1, |
98 | |
99 | /* |
100 | * Register read/write commands for processor |
101 | */ |
102 | |
103 | /* Read a single byte of USB memory */ |
104 | DT9812_R_SINGLE_BYTE_REG = 2, |
105 | /* Write a single byte of USB memory */ |
106 | DT9812_W_SINGLE_BYTE_REG = 3, |
107 | /* Multiple Reads of USB memory */ |
108 | DT9812_R_MULTI_BYTE_REG = 4, |
109 | /* Multiple Writes of USB memory */ |
110 | DT9812_W_MULTI_BYTE_REG = 5, |
111 | /* Read, (AND) with mask, OR value, then write (single) */ |
112 | DT9812_RMW_SINGLE_BYTE_REG = 6, |
113 | /* Read, (AND) with mask, OR value, then write (multiple) */ |
114 | DT9812_RMW_MULTI_BYTE_REG = 7, |
115 | |
116 | /* |
117 | * Register read/write commands for SMBus |
118 | */ |
119 | |
120 | /* Read a single byte of SMBus */ |
121 | DT9812_R_SINGLE_BYTE_SMBUS = 8, |
122 | /* Write a single byte of SMBus */ |
123 | DT9812_W_SINGLE_BYTE_SMBUS = 9, |
124 | /* Multiple Reads of SMBus */ |
125 | DT9812_R_MULTI_BYTE_SMBUS = 10, |
126 | /* Multiple Writes of SMBus */ |
127 | DT9812_W_MULTI_BYTE_SMBUS = 11, |
128 | |
129 | /* |
130 | * Register read/write commands for a device |
131 | */ |
132 | |
133 | /* Read a single byte of a device */ |
134 | DT9812_R_SINGLE_BYTE_DEV = 12, |
135 | /* Write a single byte of a device */ |
136 | DT9812_W_SINGLE_BYTE_DEV = 13, |
137 | /* Multiple Reads of a device */ |
138 | DT9812_R_MULTI_BYTE_DEV = 14, |
139 | /* Multiple Writes of a device */ |
140 | DT9812_W_MULTI_BYTE_DEV = 15, |
141 | |
142 | /* Not sure if we'll need this */ |
143 | DT9812_W_DAC_THRESHOLD = 16, |
144 | |
145 | /* Set interrupt on change mask */ |
146 | DT9812_W_INT_ON_CHANGE_MASK = 17, |
147 | |
148 | /* Write (or Clear) the CGL for the ADC */ |
149 | DT9812_W_CGL = 18, |
150 | /* Multiple Reads of USB memory */ |
151 | DT9812_R_MULTI_BYTE_USBMEM = 19, |
152 | /* Multiple Writes to USB memory */ |
153 | DT9812_W_MULTI_BYTE_USBMEM = 20, |
154 | |
155 | /* Issue a start command to a given subsystem */ |
156 | DT9812_START_SUBSYSTEM = 21, |
157 | /* Issue a stop command to a given subsystem */ |
158 | DT9812_STOP_SUBSYSTEM = 22, |
159 | |
160 | /* calibrate the board using CAL_POT_CMD */ |
161 | DT9812_CALIBRATE_POT = 23, |
162 | /* set the DAC FIFO size */ |
163 | DT9812_W_DAC_FIFO_SIZE = 24, |
164 | /* Write or Clear the CGL for the DAC */ |
165 | DT9812_W_CGL_DAC = 25, |
166 | /* Read a single value from a subsystem */ |
167 | DT9812_R_SINGLE_VALUE_CMD = 26, |
168 | /* Write a single value to a subsystem */ |
169 | DT9812_W_SINGLE_VALUE_CMD = 27, |
170 | /* Valid DT9812_USB_FIRMWARE_CMD_CODE's will be less than this number */ |
171 | DT9812_MAX_USB_FIRMWARE_CMD_CODE, |
172 | }; |
173 | |
174 | struct dt9812_flash_data { |
175 | __le16 numbytes; |
176 | __le16 address; |
177 | }; |
178 | |
179 | #define DT9812_MAX_NUM_MULTI_BYTE_RDS \ |
180 | ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / sizeof(u8)) |
181 | |
182 | struct dt9812_read_multi { |
183 | u8 count; |
184 | u8 address[DT9812_MAX_NUM_MULTI_BYTE_RDS]; |
185 | }; |
186 | |
187 | struct dt9812_write_byte { |
188 | u8 address; |
189 | u8 value; |
190 | }; |
191 | |
192 | #define DT9812_MAX_NUM_MULTI_BYTE_WRTS \ |
193 | ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \ |
194 | sizeof(struct dt9812_write_byte)) |
195 | |
196 | struct dt9812_write_multi { |
197 | u8 count; |
198 | struct dt9812_write_byte write[DT9812_MAX_NUM_MULTI_BYTE_WRTS]; |
199 | }; |
200 | |
201 | struct dt9812_rmw_byte { |
202 | u8 address; |
203 | u8 and_mask; |
204 | u8 or_value; |
205 | }; |
206 | |
207 | #define DT9812_MAX_NUM_MULTI_BYTE_RMWS \ |
208 | ((DT9812_MAX_WRITE_CMD_PIPE_SIZE - 4 - 1) / \ |
209 | sizeof(struct dt9812_rmw_byte)) |
210 | |
211 | struct dt9812_rmw_multi { |
212 | u8 count; |
213 | struct dt9812_rmw_byte rmw[DT9812_MAX_NUM_MULTI_BYTE_RMWS]; |
214 | }; |
215 | |
216 | struct dt9812_usb_cmd { |
217 | __le32 cmd; |
218 | union { |
219 | struct dt9812_flash_data flash_data_info; |
220 | struct dt9812_read_multi read_multi_info; |
221 | struct dt9812_write_multi write_multi_info; |
222 | struct dt9812_rmw_multi rmw_multi_info; |
223 | } u; |
224 | }; |
225 | |
226 | struct dt9812_private { |
227 | struct mutex mut; |
228 | struct { |
229 | __u8 addr; |
230 | size_t size; |
231 | } cmd_wr, cmd_rd; |
232 | u16 device; |
233 | }; |
234 | |
235 | static int dt9812_read_info(struct comedi_device *dev, |
236 | int offset, void *buf, size_t buf_size) |
237 | { |
238 | struct usb_device *usb = comedi_to_usb_dev(dev); |
239 | struct dt9812_private *devpriv = dev->private; |
240 | struct dt9812_usb_cmd *cmd; |
241 | size_t tbuf_size; |
242 | int count, ret; |
243 | void *tbuf; |
244 | |
245 | tbuf_size = max(sizeof(*cmd), buf_size); |
246 | |
247 | tbuf = kzalloc(size: tbuf_size, GFP_KERNEL); |
248 | if (!tbuf) |
249 | return -ENOMEM; |
250 | |
251 | cmd = tbuf; |
252 | |
253 | cmd->cmd = cpu_to_le32(DT9812_R_FLASH_DATA); |
254 | cmd->u.flash_data_info.address = |
255 | cpu_to_le16(DT9812_DIAGS_BOARD_INFO_ADDR + offset); |
256 | cmd->u.flash_data_info.numbytes = cpu_to_le16(buf_size); |
257 | |
258 | /* DT9812 only responds to 32 byte writes!! */ |
259 | ret = usb_bulk_msg(usb_dev: usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), |
260 | data: cmd, len: sizeof(*cmd), actual_length: &count, DT9812_USB_TIMEOUT); |
261 | if (ret) |
262 | goto out; |
263 | |
264 | ret = usb_bulk_msg(usb_dev: usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr), |
265 | data: tbuf, len: buf_size, actual_length: &count, DT9812_USB_TIMEOUT); |
266 | if (!ret) { |
267 | if (count == buf_size) |
268 | memcpy(buf, tbuf, buf_size); |
269 | else |
270 | ret = -EREMOTEIO; |
271 | } |
272 | out: |
273 | kfree(objp: tbuf); |
274 | |
275 | return ret; |
276 | } |
277 | |
278 | static int dt9812_read_multiple_registers(struct comedi_device *dev, |
279 | int reg_count, u8 *address, |
280 | u8 *value) |
281 | { |
282 | struct usb_device *usb = comedi_to_usb_dev(dev); |
283 | struct dt9812_private *devpriv = dev->private; |
284 | struct dt9812_usb_cmd *cmd; |
285 | int i, count, ret; |
286 | size_t buf_size; |
287 | void *buf; |
288 | |
289 | buf_size = max_t(size_t, sizeof(*cmd), reg_count); |
290 | |
291 | buf = kzalloc(size: buf_size, GFP_KERNEL); |
292 | if (!buf) |
293 | return -ENOMEM; |
294 | |
295 | cmd = buf; |
296 | |
297 | cmd->cmd = cpu_to_le32(DT9812_R_MULTI_BYTE_REG); |
298 | cmd->u.read_multi_info.count = reg_count; |
299 | for (i = 0; i < reg_count; i++) |
300 | cmd->u.read_multi_info.address[i] = address[i]; |
301 | |
302 | /* DT9812 only responds to 32 byte writes!! */ |
303 | ret = usb_bulk_msg(usb_dev: usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), |
304 | data: cmd, len: sizeof(*cmd), actual_length: &count, DT9812_USB_TIMEOUT); |
305 | if (ret) |
306 | goto out; |
307 | |
308 | ret = usb_bulk_msg(usb_dev: usb, usb_rcvbulkpipe(usb, devpriv->cmd_rd.addr), |
309 | data: buf, len: reg_count, actual_length: &count, DT9812_USB_TIMEOUT); |
310 | if (!ret) { |
311 | if (count == reg_count) |
312 | memcpy(value, buf, reg_count); |
313 | else |
314 | ret = -EREMOTEIO; |
315 | } |
316 | out: |
317 | kfree(objp: buf); |
318 | |
319 | return ret; |
320 | } |
321 | |
322 | static int dt9812_write_multiple_registers(struct comedi_device *dev, |
323 | int reg_count, u8 *address, |
324 | u8 *value) |
325 | { |
326 | struct usb_device *usb = comedi_to_usb_dev(dev); |
327 | struct dt9812_private *devpriv = dev->private; |
328 | struct dt9812_usb_cmd *cmd; |
329 | int i, count; |
330 | int ret; |
331 | |
332 | cmd = kzalloc(size: sizeof(*cmd), GFP_KERNEL); |
333 | if (!cmd) |
334 | return -ENOMEM; |
335 | |
336 | cmd->cmd = cpu_to_le32(DT9812_W_MULTI_BYTE_REG); |
337 | cmd->u.read_multi_info.count = reg_count; |
338 | for (i = 0; i < reg_count; i++) { |
339 | cmd->u.write_multi_info.write[i].address = address[i]; |
340 | cmd->u.write_multi_info.write[i].value = value[i]; |
341 | } |
342 | |
343 | /* DT9812 only responds to 32 byte writes!! */ |
344 | ret = usb_bulk_msg(usb_dev: usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), |
345 | data: cmd, len: sizeof(*cmd), actual_length: &count, DT9812_USB_TIMEOUT); |
346 | kfree(objp: cmd); |
347 | |
348 | return ret; |
349 | } |
350 | |
351 | static int dt9812_rmw_multiple_registers(struct comedi_device *dev, |
352 | int reg_count, |
353 | struct dt9812_rmw_byte *rmw) |
354 | { |
355 | struct usb_device *usb = comedi_to_usb_dev(dev); |
356 | struct dt9812_private *devpriv = dev->private; |
357 | struct dt9812_usb_cmd *cmd; |
358 | int i, count; |
359 | int ret; |
360 | |
361 | cmd = kzalloc(size: sizeof(*cmd), GFP_KERNEL); |
362 | if (!cmd) |
363 | return -ENOMEM; |
364 | |
365 | cmd->cmd = cpu_to_le32(DT9812_RMW_MULTI_BYTE_REG); |
366 | cmd->u.rmw_multi_info.count = reg_count; |
367 | for (i = 0; i < reg_count; i++) |
368 | cmd->u.rmw_multi_info.rmw[i] = rmw[i]; |
369 | |
370 | /* DT9812 only responds to 32 byte writes!! */ |
371 | ret = usb_bulk_msg(usb_dev: usb, usb_sndbulkpipe(usb, devpriv->cmd_wr.addr), |
372 | data: cmd, len: sizeof(*cmd), actual_length: &count, DT9812_USB_TIMEOUT); |
373 | kfree(objp: cmd); |
374 | |
375 | return ret; |
376 | } |
377 | |
378 | static int dt9812_digital_in(struct comedi_device *dev, u8 *bits) |
379 | { |
380 | struct dt9812_private *devpriv = dev->private; |
381 | u8 reg[2] = { F020_SFR_P3, F020_SFR_P1 }; |
382 | u8 value[2]; |
383 | int ret; |
384 | |
385 | mutex_lock(&devpriv->mut); |
386 | ret = dt9812_read_multiple_registers(dev, reg_count: 2, address: reg, value); |
387 | if (ret == 0) { |
388 | /* |
389 | * bits 0-6 in F020_SFR_P3 are bits 0-6 in the digital |
390 | * input port bit 3 in F020_SFR_P1 is bit 7 in the |
391 | * digital input port |
392 | */ |
393 | *bits = (value[0] & 0x7f) | ((value[1] & 0x08) << 4); |
394 | } |
395 | mutex_unlock(lock: &devpriv->mut); |
396 | |
397 | return ret; |
398 | } |
399 | |
400 | static int dt9812_digital_out(struct comedi_device *dev, u8 bits) |
401 | { |
402 | struct dt9812_private *devpriv = dev->private; |
403 | u8 reg[1] = { F020_SFR_P2 }; |
404 | u8 value[1] = { bits }; |
405 | int ret; |
406 | |
407 | mutex_lock(&devpriv->mut); |
408 | ret = dt9812_write_multiple_registers(dev, reg_count: 1, address: reg, value); |
409 | mutex_unlock(lock: &devpriv->mut); |
410 | |
411 | return ret; |
412 | } |
413 | |
414 | static void dt9812_configure_mux(struct comedi_device *dev, |
415 | struct dt9812_rmw_byte *rmw, int channel) |
416 | { |
417 | struct dt9812_private *devpriv = dev->private; |
418 | |
419 | if (devpriv->device == DT9812_DEVID_DT9812_10) { |
420 | /* In the DT9812/10V MUX is selected by P1.5-7 */ |
421 | rmw->address = F020_SFR_P1; |
422 | rmw->and_mask = 0xe0; |
423 | rmw->or_value = channel << 5; |
424 | } else { |
425 | /* In the DT9812/2.5V, internal mux is selected by bits 0:2 */ |
426 | rmw->address = F020_SFR_AMX0SL; |
427 | rmw->and_mask = 0xff; |
428 | rmw->or_value = channel & 0x07; |
429 | } |
430 | } |
431 | |
432 | static void dt9812_configure_gain(struct comedi_device *dev, |
433 | struct dt9812_rmw_byte *rmw, |
434 | enum dt9812_gain gain) |
435 | { |
436 | struct dt9812_private *devpriv = dev->private; |
437 | |
438 | /* In the DT9812/10V, there is an external gain of 0.5 */ |
439 | if (devpriv->device == DT9812_DEVID_DT9812_10) |
440 | gain <<= 1; |
441 | |
442 | rmw->address = F020_SFR_ADC0CF; |
443 | rmw->and_mask = F020_MASK_ADC0CF_AMP0GN2 | |
444 | F020_MASK_ADC0CF_AMP0GN1 | |
445 | F020_MASK_ADC0CF_AMP0GN0; |
446 | |
447 | switch (gain) { |
448 | /* |
449 | * 000 -> Gain = 1 |
450 | * 001 -> Gain = 2 |
451 | * 010 -> Gain = 4 |
452 | * 011 -> Gain = 8 |
453 | * 10x -> Gain = 16 |
454 | * 11x -> Gain = 0.5 |
455 | */ |
456 | case DT9812_GAIN_0PT5: |
457 | rmw->or_value = F020_MASK_ADC0CF_AMP0GN2 | |
458 | F020_MASK_ADC0CF_AMP0GN1; |
459 | break; |
460 | default: |
461 | /* this should never happen, just use a gain of 1 */ |
462 | case DT9812_GAIN_1: |
463 | rmw->or_value = 0x00; |
464 | break; |
465 | case DT9812_GAIN_2: |
466 | rmw->or_value = F020_MASK_ADC0CF_AMP0GN0; |
467 | break; |
468 | case DT9812_GAIN_4: |
469 | rmw->or_value = F020_MASK_ADC0CF_AMP0GN1; |
470 | break; |
471 | case DT9812_GAIN_8: |
472 | rmw->or_value = F020_MASK_ADC0CF_AMP0GN1 | |
473 | F020_MASK_ADC0CF_AMP0GN0; |
474 | break; |
475 | case DT9812_GAIN_16: |
476 | rmw->or_value = F020_MASK_ADC0CF_AMP0GN2; |
477 | break; |
478 | } |
479 | } |
480 | |
481 | static int dt9812_analog_in(struct comedi_device *dev, |
482 | int channel, u16 *value, enum dt9812_gain gain) |
483 | { |
484 | struct dt9812_private *devpriv = dev->private; |
485 | struct dt9812_rmw_byte rmw[3]; |
486 | u8 reg[3] = { |
487 | F020_SFR_ADC0CN, |
488 | F020_SFR_ADC0H, |
489 | F020_SFR_ADC0L |
490 | }; |
491 | u8 val[3]; |
492 | int ret; |
493 | |
494 | mutex_lock(&devpriv->mut); |
495 | |
496 | /* 1 select the gain */ |
497 | dt9812_configure_gain(dev, rmw: &rmw[0], gain); |
498 | |
499 | /* 2 set the MUX to select the channel */ |
500 | dt9812_configure_mux(dev, rmw: &rmw[1], channel); |
501 | |
502 | /* 3 start conversion */ |
503 | rmw[2].address = F020_SFR_ADC0CN; |
504 | rmw[2].and_mask = 0xff; |
505 | rmw[2].or_value = F020_MASK_ADC0CN_AD0EN | F020_MASK_ADC0CN_AD0BUSY; |
506 | |
507 | ret = dt9812_rmw_multiple_registers(dev, reg_count: 3, rmw); |
508 | if (ret) |
509 | goto exit; |
510 | |
511 | /* read the status and ADC */ |
512 | ret = dt9812_read_multiple_registers(dev, reg_count: 3, address: reg, value: val); |
513 | if (ret) |
514 | goto exit; |
515 | |
516 | /* |
517 | * An ADC conversion takes 16 SAR clocks cycles, i.e. about 9us. |
518 | * Therefore, between the instant that AD0BUSY was set via |
519 | * dt9812_rmw_multiple_registers and the read of AD0BUSY via |
520 | * dt9812_read_multiple_registers, the conversion should be complete |
521 | * since these two operations require two USB transactions each taking |
522 | * at least a millisecond to complete. However, lets make sure that |
523 | * conversion is finished. |
524 | */ |
525 | if ((val[0] & (F020_MASK_ADC0CN_AD0INT | F020_MASK_ADC0CN_AD0BUSY)) == |
526 | F020_MASK_ADC0CN_AD0INT) { |
527 | switch (devpriv->device) { |
528 | case DT9812_DEVID_DT9812_10: |
529 | /* |
530 | * For DT9812-10V the personality module set the |
531 | * encoding to 2's complement. Hence, convert it before |
532 | * returning it |
533 | */ |
534 | *value = ((val[1] << 8) | val[2]) + 0x800; |
535 | break; |
536 | case DT9812_DEVID_DT9812_2PT5: |
537 | *value = (val[1] << 8) | val[2]; |
538 | break; |
539 | } |
540 | } |
541 | |
542 | exit: |
543 | mutex_unlock(lock: &devpriv->mut); |
544 | |
545 | return ret; |
546 | } |
547 | |
548 | static int dt9812_analog_out(struct comedi_device *dev, int channel, u16 value) |
549 | { |
550 | struct dt9812_private *devpriv = dev->private; |
551 | struct dt9812_rmw_byte rmw[3]; |
552 | int ret; |
553 | |
554 | mutex_lock(&devpriv->mut); |
555 | |
556 | switch (channel) { |
557 | case 0: |
558 | /* 1. Set DAC mode */ |
559 | rmw[0].address = F020_SFR_DAC0CN; |
560 | rmw[0].and_mask = 0xff; |
561 | rmw[0].or_value = F020_MASK_DACXCN_DACXEN; |
562 | |
563 | /* 2. load lsb of DAC value first */ |
564 | rmw[1].address = F020_SFR_DAC0L; |
565 | rmw[1].and_mask = 0xff; |
566 | rmw[1].or_value = value & 0xff; |
567 | |
568 | /* 3. load msb of DAC value next to latch the 12-bit value */ |
569 | rmw[2].address = F020_SFR_DAC0H; |
570 | rmw[2].and_mask = 0xff; |
571 | rmw[2].or_value = (value >> 8) & 0xf; |
572 | break; |
573 | |
574 | case 1: |
575 | /* 1. Set DAC mode */ |
576 | rmw[0].address = F020_SFR_DAC1CN; |
577 | rmw[0].and_mask = 0xff; |
578 | rmw[0].or_value = F020_MASK_DACXCN_DACXEN; |
579 | |
580 | /* 2. load lsb of DAC value first */ |
581 | rmw[1].address = F020_SFR_DAC1L; |
582 | rmw[1].and_mask = 0xff; |
583 | rmw[1].or_value = value & 0xff; |
584 | |
585 | /* 3. load msb of DAC value next to latch the 12-bit value */ |
586 | rmw[2].address = F020_SFR_DAC1H; |
587 | rmw[2].and_mask = 0xff; |
588 | rmw[2].or_value = (value >> 8) & 0xf; |
589 | break; |
590 | } |
591 | ret = dt9812_rmw_multiple_registers(dev, reg_count: 3, rmw); |
592 | |
593 | mutex_unlock(lock: &devpriv->mut); |
594 | |
595 | return ret; |
596 | } |
597 | |
598 | static int dt9812_di_insn_bits(struct comedi_device *dev, |
599 | struct comedi_subdevice *s, |
600 | struct comedi_insn *insn, |
601 | unsigned int *data) |
602 | { |
603 | u8 bits = 0; |
604 | int ret; |
605 | |
606 | ret = dt9812_digital_in(dev, bits: &bits); |
607 | if (ret) |
608 | return ret; |
609 | |
610 | data[1] = bits; |
611 | |
612 | return insn->n; |
613 | } |
614 | |
615 | static int dt9812_do_insn_bits(struct comedi_device *dev, |
616 | struct comedi_subdevice *s, |
617 | struct comedi_insn *insn, |
618 | unsigned int *data) |
619 | { |
620 | if (comedi_dio_update_state(s, data)) |
621 | dt9812_digital_out(dev, bits: s->state); |
622 | |
623 | data[1] = s->state; |
624 | |
625 | return insn->n; |
626 | } |
627 | |
628 | static int dt9812_ai_insn_read(struct comedi_device *dev, |
629 | struct comedi_subdevice *s, |
630 | struct comedi_insn *insn, |
631 | unsigned int *data) |
632 | { |
633 | unsigned int chan = CR_CHAN(insn->chanspec); |
634 | u16 val = 0; |
635 | int ret; |
636 | int i; |
637 | |
638 | for (i = 0; i < insn->n; i++) { |
639 | ret = dt9812_analog_in(dev, channel: chan, value: &val, gain: DT9812_GAIN_1); |
640 | if (ret) |
641 | return ret; |
642 | data[i] = val; |
643 | } |
644 | |
645 | return insn->n; |
646 | } |
647 | |
648 | static int dt9812_ao_insn_read(struct comedi_device *dev, |
649 | struct comedi_subdevice *s, |
650 | struct comedi_insn *insn, |
651 | unsigned int *data) |
652 | { |
653 | struct dt9812_private *devpriv = dev->private; |
654 | int ret; |
655 | |
656 | mutex_lock(&devpriv->mut); |
657 | ret = comedi_readback_insn_read(dev, s, insn, data); |
658 | mutex_unlock(lock: &devpriv->mut); |
659 | |
660 | return ret; |
661 | } |
662 | |
663 | static int dt9812_ao_insn_write(struct comedi_device *dev, |
664 | struct comedi_subdevice *s, |
665 | struct comedi_insn *insn, |
666 | unsigned int *data) |
667 | { |
668 | unsigned int chan = CR_CHAN(insn->chanspec); |
669 | int i; |
670 | |
671 | for (i = 0; i < insn->n; i++) { |
672 | unsigned int val = data[i]; |
673 | int ret; |
674 | |
675 | ret = dt9812_analog_out(dev, channel: chan, value: val); |
676 | if (ret) |
677 | return ret; |
678 | |
679 | s->readback[chan] = val; |
680 | } |
681 | |
682 | return insn->n; |
683 | } |
684 | |
685 | static int dt9812_find_endpoints(struct comedi_device *dev) |
686 | { |
687 | struct usb_interface *intf = comedi_to_usb_interface(dev); |
688 | struct usb_host_interface *host = intf->cur_altsetting; |
689 | struct dt9812_private *devpriv = dev->private; |
690 | struct usb_endpoint_descriptor *ep; |
691 | int i; |
692 | |
693 | if (host->desc.bNumEndpoints != 5) { |
694 | dev_err(dev->class_dev, "Wrong number of endpoints\n" ); |
695 | return -ENODEV; |
696 | } |
697 | |
698 | for (i = 0; i < host->desc.bNumEndpoints; ++i) { |
699 | int dir = -1; |
700 | |
701 | ep = &host->endpoint[i].desc; |
702 | switch (i) { |
703 | case 0: |
704 | /* unused message pipe */ |
705 | dir = USB_DIR_IN; |
706 | break; |
707 | case 1: |
708 | dir = USB_DIR_OUT; |
709 | devpriv->cmd_wr.addr = ep->bEndpointAddress; |
710 | devpriv->cmd_wr.size = usb_endpoint_maxp(epd: ep); |
711 | break; |
712 | case 2: |
713 | dir = USB_DIR_IN; |
714 | devpriv->cmd_rd.addr = ep->bEndpointAddress; |
715 | devpriv->cmd_rd.size = usb_endpoint_maxp(epd: ep); |
716 | break; |
717 | case 3: |
718 | /* unused write stream */ |
719 | dir = USB_DIR_OUT; |
720 | break; |
721 | case 4: |
722 | /* unused read stream */ |
723 | dir = USB_DIR_IN; |
724 | break; |
725 | } |
726 | if ((ep->bEndpointAddress & USB_DIR_IN) != dir) { |
727 | dev_err(dev->class_dev, |
728 | "Endpoint has wrong direction\n" ); |
729 | return -ENODEV; |
730 | } |
731 | } |
732 | return 0; |
733 | } |
734 | |
735 | static int dt9812_reset_device(struct comedi_device *dev) |
736 | { |
737 | struct usb_device *usb = comedi_to_usb_dev(dev); |
738 | struct dt9812_private *devpriv = dev->private; |
739 | u32 serial; |
740 | u16 vendor; |
741 | u16 product; |
742 | u8 tmp8; |
743 | __le16 tmp16; |
744 | __le32 tmp32; |
745 | int ret; |
746 | int i; |
747 | |
748 | ret = dt9812_read_info(dev, offset: 0, buf: &tmp8, buf_size: sizeof(tmp8)); |
749 | if (ret) { |
750 | /* |
751 | * Seems like a configuration reset is necessary if driver is |
752 | * reloaded while device is attached |
753 | */ |
754 | usb_reset_configuration(dev: usb); |
755 | for (i = 0; i < 10; i++) { |
756 | ret = dt9812_read_info(dev, offset: 1, buf: &tmp8, buf_size: sizeof(tmp8)); |
757 | if (ret == 0) |
758 | break; |
759 | } |
760 | if (ret) { |
761 | dev_err(dev->class_dev, |
762 | "unable to reset configuration\n" ); |
763 | return ret; |
764 | } |
765 | } |
766 | |
767 | ret = dt9812_read_info(dev, offset: 1, buf: &tmp16, buf_size: sizeof(tmp16)); |
768 | if (ret) { |
769 | dev_err(dev->class_dev, "failed to read vendor id\n" ); |
770 | return ret; |
771 | } |
772 | vendor = le16_to_cpu(tmp16); |
773 | |
774 | ret = dt9812_read_info(dev, offset: 3, buf: &tmp16, buf_size: sizeof(tmp16)); |
775 | if (ret) { |
776 | dev_err(dev->class_dev, "failed to read product id\n" ); |
777 | return ret; |
778 | } |
779 | product = le16_to_cpu(tmp16); |
780 | |
781 | ret = dt9812_read_info(dev, offset: 5, buf: &tmp16, buf_size: sizeof(tmp16)); |
782 | if (ret) { |
783 | dev_err(dev->class_dev, "failed to read device id\n" ); |
784 | return ret; |
785 | } |
786 | devpriv->device = le16_to_cpu(tmp16); |
787 | |
788 | ret = dt9812_read_info(dev, offset: 7, buf: &tmp32, buf_size: sizeof(tmp32)); |
789 | if (ret) { |
790 | dev_err(dev->class_dev, "failed to read serial number\n" ); |
791 | return ret; |
792 | } |
793 | serial = le32_to_cpu(tmp32); |
794 | |
795 | /* let the user know what node this device is now attached to */ |
796 | dev_info(dev->class_dev, "USB DT9812 (%4.4x.%4.4x.%4.4x) #0x%8.8x\n" , |
797 | vendor, product, devpriv->device, serial); |
798 | |
799 | if (devpriv->device != DT9812_DEVID_DT9812_10 && |
800 | devpriv->device != DT9812_DEVID_DT9812_2PT5) { |
801 | dev_err(dev->class_dev, "Unsupported device!\n" ); |
802 | return -EINVAL; |
803 | } |
804 | |
805 | return 0; |
806 | } |
807 | |
808 | static int dt9812_auto_attach(struct comedi_device *dev, |
809 | unsigned long context) |
810 | { |
811 | struct usb_interface *intf = comedi_to_usb_interface(dev); |
812 | struct dt9812_private *devpriv; |
813 | struct comedi_subdevice *s; |
814 | bool is_unipolar; |
815 | int ret; |
816 | int i; |
817 | |
818 | devpriv = comedi_alloc_devpriv(dev, size: sizeof(*devpriv)); |
819 | if (!devpriv) |
820 | return -ENOMEM; |
821 | |
822 | mutex_init(&devpriv->mut); |
823 | usb_set_intfdata(intf, data: devpriv); |
824 | |
825 | ret = dt9812_find_endpoints(dev); |
826 | if (ret) |
827 | return ret; |
828 | |
829 | ret = dt9812_reset_device(dev); |
830 | if (ret) |
831 | return ret; |
832 | |
833 | is_unipolar = (devpriv->device == DT9812_DEVID_DT9812_2PT5); |
834 | |
835 | ret = comedi_alloc_subdevices(dev, num_subdevices: 4); |
836 | if (ret) |
837 | return ret; |
838 | |
839 | /* Digital Input subdevice */ |
840 | s = &dev->subdevices[0]; |
841 | s->type = COMEDI_SUBD_DI; |
842 | s->subdev_flags = SDF_READABLE; |
843 | s->n_chan = 8; |
844 | s->maxdata = 1; |
845 | s->range_table = &range_digital; |
846 | s->insn_bits = dt9812_di_insn_bits; |
847 | |
848 | /* Digital Output subdevice */ |
849 | s = &dev->subdevices[1]; |
850 | s->type = COMEDI_SUBD_DO; |
851 | s->subdev_flags = SDF_WRITABLE; |
852 | s->n_chan = 8; |
853 | s->maxdata = 1; |
854 | s->range_table = &range_digital; |
855 | s->insn_bits = dt9812_do_insn_bits; |
856 | |
857 | /* Analog Input subdevice */ |
858 | s = &dev->subdevices[2]; |
859 | s->type = COMEDI_SUBD_AI; |
860 | s->subdev_flags = SDF_READABLE | SDF_GROUND; |
861 | s->n_chan = 8; |
862 | s->maxdata = 0x0fff; |
863 | s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10; |
864 | s->insn_read = dt9812_ai_insn_read; |
865 | |
866 | /* Analog Output subdevice */ |
867 | s = &dev->subdevices[3]; |
868 | s->type = COMEDI_SUBD_AO; |
869 | s->subdev_flags = SDF_WRITABLE; |
870 | s->n_chan = 2; |
871 | s->maxdata = 0x0fff; |
872 | s->range_table = is_unipolar ? &range_unipolar2_5 : &range_bipolar10; |
873 | s->insn_write = dt9812_ao_insn_write; |
874 | s->insn_read = dt9812_ao_insn_read; |
875 | |
876 | ret = comedi_alloc_subdev_readback(s); |
877 | if (ret) |
878 | return ret; |
879 | |
880 | for (i = 0; i < s->n_chan; i++) |
881 | s->readback[i] = is_unipolar ? 0x0000 : 0x0800; |
882 | |
883 | return 0; |
884 | } |
885 | |
886 | static void dt9812_detach(struct comedi_device *dev) |
887 | { |
888 | struct usb_interface *intf = comedi_to_usb_interface(dev); |
889 | struct dt9812_private *devpriv = dev->private; |
890 | |
891 | if (!devpriv) |
892 | return; |
893 | |
894 | mutex_destroy(lock: &devpriv->mut); |
895 | usb_set_intfdata(intf, NULL); |
896 | } |
897 | |
898 | static struct comedi_driver dt9812_driver = { |
899 | .driver_name = "dt9812" , |
900 | .module = THIS_MODULE, |
901 | .auto_attach = dt9812_auto_attach, |
902 | .detach = dt9812_detach, |
903 | }; |
904 | |
905 | static int dt9812_usb_probe(struct usb_interface *intf, |
906 | const struct usb_device_id *id) |
907 | { |
908 | return comedi_usb_auto_config(intf, driver: &dt9812_driver, context: id->driver_info); |
909 | } |
910 | |
911 | static const struct usb_device_id dt9812_usb_table[] = { |
912 | { USB_DEVICE(0x0867, 0x9812) }, |
913 | { } |
914 | }; |
915 | MODULE_DEVICE_TABLE(usb, dt9812_usb_table); |
916 | |
917 | static struct usb_driver dt9812_usb_driver = { |
918 | .name = "dt9812" , |
919 | .id_table = dt9812_usb_table, |
920 | .probe = dt9812_usb_probe, |
921 | .disconnect = comedi_usb_auto_unconfig, |
922 | }; |
923 | module_comedi_usb_driver(dt9812_driver, dt9812_usb_driver); |
924 | |
925 | MODULE_AUTHOR("Anders Blomdell <anders.blomdell@control.lth.se>" ); |
926 | MODULE_DESCRIPTION("Comedi DT9812 driver" ); |
927 | MODULE_LICENSE("GPL" ); |
928 | |