1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * ds2482.c - provides i2c to w1-master bridge(s) |
4 | * Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com> |
5 | * |
6 | * The DS2482 is a sensor chip made by Dallas Semiconductor (Maxim). |
7 | * It is a I2C to 1-wire bridge. |
8 | * There are two variations: -100 and -800, which have 1 or 8 1-wire ports. |
9 | * The complete datasheet can be obtained from MAXIM's website at: |
10 | * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4382 |
11 | */ |
12 | |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/i2c.h> |
17 | #include <linux/delay.h> |
18 | |
19 | #include <linux/w1.h> |
20 | |
21 | /* |
22 | * Allow the active pullup to be disabled, default is enabled. |
23 | * |
24 | * Note from the DS2482 datasheet: |
25 | * The APU bit controls whether an active pullup (controlled slew-rate |
26 | * transistor) or a passive pullup (Rwpu resistor) will be used to drive |
27 | * a 1-Wire line from low to high. When APU = 0, active pullup is disabled |
28 | * (resistor mode). Active Pullup should always be selected unless there is |
29 | * only a single slave on the 1-Wire line. |
30 | */ |
31 | static int ds2482_active_pullup = 1; |
32 | module_param_named(active_pullup, ds2482_active_pullup, int, 0644); |
33 | MODULE_PARM_DESC(active_pullup, "Active pullup (apply to all buses): " \ |
34 | "0-disable, 1-enable (default)" ); |
35 | |
36 | /* extra configurations - e.g. 1WS */ |
37 | static int ; |
38 | module_param(extra_config, int, 0644); |
39 | MODULE_PARM_DESC(extra_config, "Extra Configuration settings 1=APU,2=PPM,3=SPU,8=1WS" ); |
40 | |
41 | /* |
42 | * The DS2482 registers - there are 3 registers that are addressed by a read |
43 | * pointer. The read pointer is set by the last command executed. |
44 | * |
45 | * To read the data, issue a register read for any address |
46 | */ |
47 | #define DS2482_CMD_RESET 0xF0 /* No param */ |
48 | #define DS2482_CMD_SET_READ_PTR 0xE1 /* Param: DS2482_PTR_CODE_xxx */ |
49 | #define DS2482_CMD_CHANNEL_SELECT 0xC3 /* Param: Channel byte - DS2482-800 only */ |
50 | #define DS2482_CMD_WRITE_CONFIG 0xD2 /* Param: Config byte */ |
51 | #define DS2482_CMD_1WIRE_RESET 0xB4 /* Param: None */ |
52 | #define DS2482_CMD_1WIRE_SINGLE_BIT 0x87 /* Param: Bit byte (bit7) */ |
53 | #define DS2482_CMD_1WIRE_WRITE_BYTE 0xA5 /* Param: Data byte */ |
54 | #define DS2482_CMD_1WIRE_READ_BYTE 0x96 /* Param: None */ |
55 | /* Note to read the byte, Set the ReadPtr to Data then read (any addr) */ |
56 | #define DS2482_CMD_1WIRE_TRIPLET 0x78 /* Param: Dir byte (bit7) */ |
57 | |
58 | /* Values for DS2482_CMD_SET_READ_PTR */ |
59 | #define DS2482_PTR_CODE_STATUS 0xF0 |
60 | #define DS2482_PTR_CODE_DATA 0xE1 |
61 | #define DS2482_PTR_CODE_CHANNEL 0xD2 /* DS2482-800 only */ |
62 | #define DS2482_PTR_CODE_CONFIG 0xC3 |
63 | |
64 | /* |
65 | * Configure Register bit definitions |
66 | * The top 4 bits always read 0. |
67 | * To write, the top nibble must be the 1's compl. of the low nibble. |
68 | */ |
69 | #define DS2482_REG_CFG_1WS 0x08 /* 1-wire speed */ |
70 | #define DS2482_REG_CFG_SPU 0x04 /* strong pull-up */ |
71 | #define DS2482_REG_CFG_PPM 0x02 /* presence pulse masking */ |
72 | #define DS2482_REG_CFG_APU 0x01 /* active pull-up */ |
73 | |
74 | |
75 | /* |
76 | * Write and verify codes for the CHANNEL_SELECT command (DS2482-800 only). |
77 | * To set the channel, write the value at the index of the channel. |
78 | * Read and compare against the corresponding value to verify the change. |
79 | */ |
80 | static const u8 ds2482_chan_wr[8] = { 0xF0, 0xE1, 0xD2, 0xC3, 0xB4, 0xA5, 0x96, 0x87 }; |
81 | static const u8 ds2482_chan_rd[8] = { 0xB8, 0xB1, 0xAA, 0xA3, 0x9C, 0x95, 0x8E, 0x87 }; |
82 | |
83 | |
84 | /* |
85 | * Status Register bit definitions (read only) |
86 | */ |
87 | #define DS2482_REG_STS_DIR 0x80 |
88 | #define DS2482_REG_STS_TSB 0x40 |
89 | #define DS2482_REG_STS_SBR 0x20 |
90 | #define DS2482_REG_STS_RST 0x10 |
91 | #define DS2482_REG_STS_LL 0x08 |
92 | #define DS2482_REG_STS_SD 0x04 |
93 | #define DS2482_REG_STS_PPD 0x02 |
94 | #define DS2482_REG_STS_1WB 0x01 |
95 | |
96 | /* |
97 | * Client data (each client gets its own) |
98 | */ |
99 | |
100 | struct ds2482_data; |
101 | |
102 | struct ds2482_w1_chan { |
103 | struct ds2482_data *pdev; |
104 | u8 channel; |
105 | struct w1_bus_master w1_bm; |
106 | }; |
107 | |
108 | struct ds2482_data { |
109 | struct i2c_client *client; |
110 | struct mutex access_lock; |
111 | |
112 | /* 1-wire interface(s) */ |
113 | int w1_count; /* 1 or 8 */ |
114 | struct ds2482_w1_chan w1_ch[8]; |
115 | |
116 | /* per-device values */ |
117 | u8 channel; |
118 | u8 read_prt; /* see DS2482_PTR_CODE_xxx */ |
119 | u8 reg_config; |
120 | }; |
121 | |
122 | |
123 | /** |
124 | * ds2482_calculate_config - Helper to calculate values for configuration register |
125 | * @conf: the raw config value |
126 | * Return: the value w/ complements that can be written to register |
127 | */ |
128 | static inline u8 ds2482_calculate_config(u8 conf) |
129 | { |
130 | conf |= extra_config; |
131 | |
132 | if (ds2482_active_pullup) |
133 | conf |= DS2482_REG_CFG_APU; |
134 | |
135 | return conf | ((~conf & 0x0f) << 4); |
136 | } |
137 | |
138 | |
139 | /** |
140 | * ds2482_select_register - Sets the read pointer. |
141 | * @pdev: The ds2482 client pointer |
142 | * @read_ptr: see DS2482_PTR_CODE_xxx above |
143 | * Return: -1 on failure, 0 on success |
144 | */ |
145 | static inline int ds2482_select_register(struct ds2482_data *pdev, u8 read_ptr) |
146 | { |
147 | if (pdev->read_prt != read_ptr) { |
148 | if (i2c_smbus_write_byte_data(client: pdev->client, |
149 | DS2482_CMD_SET_READ_PTR, |
150 | value: read_ptr) < 0) |
151 | return -1; |
152 | |
153 | pdev->read_prt = read_ptr; |
154 | } |
155 | return 0; |
156 | } |
157 | |
158 | /** |
159 | * ds2482_send_cmd - Sends a command without a parameter |
160 | * @pdev: The ds2482 client pointer |
161 | * @cmd: DS2482_CMD_RESET, |
162 | * DS2482_CMD_1WIRE_RESET, |
163 | * DS2482_CMD_1WIRE_READ_BYTE |
164 | * Return: -1 on failure, 0 on success |
165 | */ |
166 | static inline int ds2482_send_cmd(struct ds2482_data *pdev, u8 cmd) |
167 | { |
168 | if (i2c_smbus_write_byte(client: pdev->client, value: cmd) < 0) |
169 | return -1; |
170 | |
171 | pdev->read_prt = DS2482_PTR_CODE_STATUS; |
172 | return 0; |
173 | } |
174 | |
175 | /** |
176 | * ds2482_send_cmd_data - Sends a command with a parameter |
177 | * @pdev: The ds2482 client pointer |
178 | * @cmd: DS2482_CMD_WRITE_CONFIG, |
179 | * DS2482_CMD_1WIRE_SINGLE_BIT, |
180 | * DS2482_CMD_1WIRE_WRITE_BYTE, |
181 | * DS2482_CMD_1WIRE_TRIPLET |
182 | * @byte: The data to send |
183 | * Return: -1 on failure, 0 on success |
184 | */ |
185 | static inline int ds2482_send_cmd_data(struct ds2482_data *pdev, |
186 | u8 cmd, u8 byte) |
187 | { |
188 | if (i2c_smbus_write_byte_data(client: pdev->client, command: cmd, value: byte) < 0) |
189 | return -1; |
190 | |
191 | /* all cmds leave in STATUS, except CONFIG */ |
192 | pdev->read_prt = (cmd != DS2482_CMD_WRITE_CONFIG) ? |
193 | DS2482_PTR_CODE_STATUS : DS2482_PTR_CODE_CONFIG; |
194 | return 0; |
195 | } |
196 | |
197 | |
198 | /* |
199 | * 1-Wire interface code |
200 | */ |
201 | |
202 | #define DS2482_WAIT_IDLE_TIMEOUT 100 |
203 | |
204 | /** |
205 | * ds2482_wait_1wire_idle - Waits until the 1-wire interface is idle (not busy) |
206 | * |
207 | * @pdev: Pointer to the device structure |
208 | * Return: the last value read from status or -1 (failure) |
209 | */ |
210 | static int ds2482_wait_1wire_idle(struct ds2482_data *pdev) |
211 | { |
212 | int temp = -1; |
213 | int retries = 0; |
214 | |
215 | if (!ds2482_select_register(pdev, DS2482_PTR_CODE_STATUS)) { |
216 | do { |
217 | temp = i2c_smbus_read_byte(client: pdev->client); |
218 | } while ((temp >= 0) && (temp & DS2482_REG_STS_1WB) && |
219 | (++retries < DS2482_WAIT_IDLE_TIMEOUT)); |
220 | } |
221 | |
222 | if (retries >= DS2482_WAIT_IDLE_TIMEOUT) |
223 | pr_err("%s: timeout on channel %d\n" , |
224 | __func__, pdev->channel); |
225 | |
226 | return temp; |
227 | } |
228 | |
229 | /** |
230 | * ds2482_set_channel - Selects a w1 channel. |
231 | * The 1-wire interface must be idle before calling this function. |
232 | * |
233 | * @pdev: The ds2482 client pointer |
234 | * @channel: 0-7 |
235 | * Return: -1 (failure) or 0 (success) |
236 | */ |
237 | static int ds2482_set_channel(struct ds2482_data *pdev, u8 channel) |
238 | { |
239 | if (i2c_smbus_write_byte_data(client: pdev->client, DS2482_CMD_CHANNEL_SELECT, |
240 | value: ds2482_chan_wr[channel]) < 0) |
241 | return -1; |
242 | |
243 | pdev->read_prt = DS2482_PTR_CODE_CHANNEL; |
244 | pdev->channel = -1; |
245 | if (i2c_smbus_read_byte(client: pdev->client) == ds2482_chan_rd[channel]) { |
246 | pdev->channel = channel; |
247 | return 0; |
248 | } |
249 | return -1; |
250 | } |
251 | |
252 | |
253 | /** |
254 | * ds2482_w1_touch_bit - Performs the touch-bit function, which writes a 0 or 1 and reads the level. |
255 | * |
256 | * @data: The ds2482 channel pointer |
257 | * @bit: The level to write: 0 or non-zero |
258 | * Return: The level read: 0 or 1 |
259 | */ |
260 | static u8 ds2482_w1_touch_bit(void *data, u8 bit) |
261 | { |
262 | struct ds2482_w1_chan *pchan = data; |
263 | struct ds2482_data *pdev = pchan->pdev; |
264 | int status = -1; |
265 | |
266 | mutex_lock(&pdev->access_lock); |
267 | |
268 | /* Select the channel */ |
269 | ds2482_wait_1wire_idle(pdev); |
270 | if (pdev->w1_count > 1) |
271 | ds2482_set_channel(pdev, channel: pchan->channel); |
272 | |
273 | /* Send the touch command, wait until 1WB == 0, return the status */ |
274 | if (!ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_SINGLE_BIT, |
275 | byte: bit ? 0xFF : 0)) |
276 | status = ds2482_wait_1wire_idle(pdev); |
277 | |
278 | mutex_unlock(lock: &pdev->access_lock); |
279 | |
280 | return (status & DS2482_REG_STS_SBR) ? 1 : 0; |
281 | } |
282 | |
283 | /** |
284 | * ds2482_w1_triplet - Performs the triplet function, which reads two bits and writes a bit. |
285 | * The bit written is determined by the two reads: |
286 | * 00 => dbit, 01 => 0, 10 => 1 |
287 | * |
288 | * @data: The ds2482 channel pointer |
289 | * @dbit: The direction to choose if both branches are valid |
290 | * Return: b0=read1 b1=read2 b3=bit written |
291 | */ |
292 | static u8 ds2482_w1_triplet(void *data, u8 dbit) |
293 | { |
294 | struct ds2482_w1_chan *pchan = data; |
295 | struct ds2482_data *pdev = pchan->pdev; |
296 | int status = (3 << 5); |
297 | |
298 | mutex_lock(&pdev->access_lock); |
299 | |
300 | /* Select the channel */ |
301 | ds2482_wait_1wire_idle(pdev); |
302 | if (pdev->w1_count > 1) |
303 | ds2482_set_channel(pdev, channel: pchan->channel); |
304 | |
305 | /* Send the triplet command, wait until 1WB == 0, return the status */ |
306 | if (!ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_TRIPLET, |
307 | byte: dbit ? 0xFF : 0)) |
308 | status = ds2482_wait_1wire_idle(pdev); |
309 | |
310 | mutex_unlock(lock: &pdev->access_lock); |
311 | |
312 | /* Decode the status */ |
313 | return (status >> 5); |
314 | } |
315 | |
316 | /** |
317 | * ds2482_w1_write_byte - Performs the write byte function. |
318 | * |
319 | * @data: The ds2482 channel pointer |
320 | * @byte: The value to write |
321 | */ |
322 | static void ds2482_w1_write_byte(void *data, u8 byte) |
323 | { |
324 | struct ds2482_w1_chan *pchan = data; |
325 | struct ds2482_data *pdev = pchan->pdev; |
326 | |
327 | mutex_lock(&pdev->access_lock); |
328 | |
329 | /* Select the channel */ |
330 | ds2482_wait_1wire_idle(pdev); |
331 | if (pdev->w1_count > 1) |
332 | ds2482_set_channel(pdev, channel: pchan->channel); |
333 | |
334 | /* Send the write byte command */ |
335 | ds2482_send_cmd_data(pdev, DS2482_CMD_1WIRE_WRITE_BYTE, byte); |
336 | |
337 | mutex_unlock(lock: &pdev->access_lock); |
338 | } |
339 | |
340 | /** |
341 | * ds2482_w1_read_byte - Performs the read byte function. |
342 | * |
343 | * @data: The ds2482 channel pointer |
344 | * Return: The value read |
345 | */ |
346 | static u8 ds2482_w1_read_byte(void *data) |
347 | { |
348 | struct ds2482_w1_chan *pchan = data; |
349 | struct ds2482_data *pdev = pchan->pdev; |
350 | int result; |
351 | |
352 | mutex_lock(&pdev->access_lock); |
353 | |
354 | /* Select the channel */ |
355 | ds2482_wait_1wire_idle(pdev); |
356 | if (pdev->w1_count > 1) |
357 | ds2482_set_channel(pdev, channel: pchan->channel); |
358 | |
359 | /* Send the read byte command */ |
360 | ds2482_send_cmd(pdev, DS2482_CMD_1WIRE_READ_BYTE); |
361 | |
362 | /* Wait until 1WB == 0 */ |
363 | ds2482_wait_1wire_idle(pdev); |
364 | |
365 | /* Select the data register */ |
366 | ds2482_select_register(pdev, DS2482_PTR_CODE_DATA); |
367 | |
368 | /* Read the data byte */ |
369 | result = i2c_smbus_read_byte(client: pdev->client); |
370 | |
371 | mutex_unlock(lock: &pdev->access_lock); |
372 | |
373 | return result; |
374 | } |
375 | |
376 | |
377 | /** |
378 | * ds2482_w1_reset_bus - Sends a reset on the 1-wire interface |
379 | * |
380 | * @data: The ds2482 channel pointer |
381 | * Return: 0=Device present, 1=No device present or error |
382 | */ |
383 | static u8 ds2482_w1_reset_bus(void *data) |
384 | { |
385 | struct ds2482_w1_chan *pchan = data; |
386 | struct ds2482_data *pdev = pchan->pdev; |
387 | int err; |
388 | u8 retval = 1; |
389 | |
390 | mutex_lock(&pdev->access_lock); |
391 | |
392 | /* Select the channel */ |
393 | ds2482_wait_1wire_idle(pdev); |
394 | if (pdev->w1_count > 1) |
395 | ds2482_set_channel(pdev, channel: pchan->channel); |
396 | |
397 | /* Send the reset command */ |
398 | err = ds2482_send_cmd(pdev, DS2482_CMD_1WIRE_RESET); |
399 | if (err >= 0) { |
400 | /* Wait until the reset is complete */ |
401 | err = ds2482_wait_1wire_idle(pdev); |
402 | retval = !(err & DS2482_REG_STS_PPD); |
403 | |
404 | /* If the chip did reset since detect, re-config it */ |
405 | if (err & DS2482_REG_STS_RST) |
406 | ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, |
407 | byte: ds2482_calculate_config(conf: 0x00)); |
408 | } |
409 | |
410 | mutex_unlock(lock: &pdev->access_lock); |
411 | |
412 | return retval; |
413 | } |
414 | |
415 | static u8 ds2482_w1_set_pullup(void *data, int delay) |
416 | { |
417 | struct ds2482_w1_chan *pchan = data; |
418 | struct ds2482_data *pdev = pchan->pdev; |
419 | u8 retval = 1; |
420 | |
421 | /* if delay is non-zero activate the pullup, |
422 | * the strong pullup will be automatically deactivated |
423 | * by the master, so do not explicitly deactive it |
424 | */ |
425 | if (delay) { |
426 | /* both waits are crucial, otherwise devices might not be |
427 | * powered long enough, causing e.g. a w1_therm sensor to |
428 | * provide wrong conversion results |
429 | */ |
430 | ds2482_wait_1wire_idle(pdev); |
431 | /* note: it seems like both SPU and APU have to be set! */ |
432 | retval = ds2482_send_cmd_data(pdev, DS2482_CMD_WRITE_CONFIG, |
433 | byte: ds2482_calculate_config(DS2482_REG_CFG_SPU | |
434 | DS2482_REG_CFG_APU)); |
435 | ds2482_wait_1wire_idle(pdev); |
436 | } |
437 | |
438 | return retval; |
439 | } |
440 | |
441 | |
442 | static int ds2482_probe(struct i2c_client *client) |
443 | { |
444 | struct ds2482_data *data; |
445 | int err = -ENODEV; |
446 | int temp1; |
447 | int idx; |
448 | |
449 | if (!i2c_check_functionality(adap: client->adapter, |
450 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA | |
451 | I2C_FUNC_SMBUS_BYTE)) |
452 | return -ENODEV; |
453 | |
454 | data = kzalloc(size: sizeof(struct ds2482_data), GFP_KERNEL); |
455 | if (!data) { |
456 | err = -ENOMEM; |
457 | goto exit; |
458 | } |
459 | |
460 | data->client = client; |
461 | i2c_set_clientdata(client, data); |
462 | |
463 | /* Reset the device (sets the read_ptr to status) */ |
464 | if (ds2482_send_cmd(pdev: data, DS2482_CMD_RESET) < 0) { |
465 | dev_warn(&client->dev, "DS2482 reset failed.\n" ); |
466 | goto exit_free; |
467 | } |
468 | |
469 | /* Sleep at least 525ns to allow the reset to complete */ |
470 | ndelay(525); |
471 | |
472 | /* Read the status byte - only reset bit and line should be set */ |
473 | temp1 = i2c_smbus_read_byte(client); |
474 | if (temp1 != (DS2482_REG_STS_LL | DS2482_REG_STS_RST)) { |
475 | dev_warn(&client->dev, "DS2482 reset status " |
476 | "0x%02X - not a DS2482\n" , temp1); |
477 | goto exit_free; |
478 | } |
479 | |
480 | /* Detect the 8-port version */ |
481 | data->w1_count = 1; |
482 | if (ds2482_set_channel(pdev: data, channel: 7) == 0) |
483 | data->w1_count = 8; |
484 | |
485 | /* Set all config items to 0 (off) */ |
486 | ds2482_send_cmd_data(pdev: data, DS2482_CMD_WRITE_CONFIG, |
487 | byte: ds2482_calculate_config(conf: 0x00)); |
488 | |
489 | mutex_init(&data->access_lock); |
490 | |
491 | /* Register 1-wire interface(s) */ |
492 | for (idx = 0; idx < data->w1_count; idx++) { |
493 | data->w1_ch[idx].pdev = data; |
494 | data->w1_ch[idx].channel = idx; |
495 | |
496 | /* Populate all the w1 bus master stuff */ |
497 | data->w1_ch[idx].w1_bm.data = &data->w1_ch[idx]; |
498 | data->w1_ch[idx].w1_bm.read_byte = ds2482_w1_read_byte; |
499 | data->w1_ch[idx].w1_bm.write_byte = ds2482_w1_write_byte; |
500 | data->w1_ch[idx].w1_bm.touch_bit = ds2482_w1_touch_bit; |
501 | data->w1_ch[idx].w1_bm.triplet = ds2482_w1_triplet; |
502 | data->w1_ch[idx].w1_bm.reset_bus = ds2482_w1_reset_bus; |
503 | data->w1_ch[idx].w1_bm.set_pullup = ds2482_w1_set_pullup; |
504 | |
505 | err = w1_add_master_device(master: &data->w1_ch[idx].w1_bm); |
506 | if (err) { |
507 | data->w1_ch[idx].pdev = NULL; |
508 | goto exit_w1_remove; |
509 | } |
510 | } |
511 | |
512 | return 0; |
513 | |
514 | exit_w1_remove: |
515 | for (idx = 0; idx < data->w1_count; idx++) { |
516 | if (data->w1_ch[idx].pdev != NULL) |
517 | w1_remove_master_device(master: &data->w1_ch[idx].w1_bm); |
518 | } |
519 | exit_free: |
520 | kfree(objp: data); |
521 | exit: |
522 | return err; |
523 | } |
524 | |
525 | static void ds2482_remove(struct i2c_client *client) |
526 | { |
527 | struct ds2482_data *data = i2c_get_clientdata(client); |
528 | int idx; |
529 | |
530 | /* Unregister the 1-wire bridge(s) */ |
531 | for (idx = 0; idx < data->w1_count; idx++) { |
532 | if (data->w1_ch[idx].pdev != NULL) |
533 | w1_remove_master_device(master: &data->w1_ch[idx].w1_bm); |
534 | } |
535 | |
536 | /* Free the memory */ |
537 | kfree(objp: data); |
538 | } |
539 | |
540 | /* |
541 | * Driver data (common to all clients) |
542 | */ |
543 | static const struct i2c_device_id ds2482_id[] = { |
544 | { "ds2482" , 0 }, |
545 | { "ds2484" , 0 }, |
546 | { } |
547 | }; |
548 | MODULE_DEVICE_TABLE(i2c, ds2482_id); |
549 | |
550 | static struct i2c_driver ds2482_driver = { |
551 | .driver = { |
552 | .name = "ds2482" , |
553 | }, |
554 | .probe = ds2482_probe, |
555 | .remove = ds2482_remove, |
556 | .id_table = ds2482_id, |
557 | }; |
558 | module_i2c_driver(ds2482_driver); |
559 | |
560 | MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>" ); |
561 | MODULE_DESCRIPTION("DS2482 driver" ); |
562 | |
563 | MODULE_LICENSE("GPL" ); |
564 | |