1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Intel La Jolla Cove Adapter USB-GPIO driver |
4 | * |
5 | * Copyright (c) 2023, Intel Corporation. |
6 | */ |
7 | |
8 | #include <linux/acpi.h> |
9 | #include <linux/auxiliary_bus.h> |
10 | #include <linux/bitfield.h> |
11 | #include <linux/bitops.h> |
12 | #include <linux/dev_printk.h> |
13 | #include <linux/gpio/driver.h> |
14 | #include <linux/irq.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/kref.h> |
17 | #include <linux/module.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/types.h> |
20 | #include <linux/usb/ljca.h> |
21 | |
22 | /* GPIO commands */ |
23 | #define LJCA_GPIO_CONFIG 1 |
24 | #define LJCA_GPIO_READ 2 |
25 | #define LJCA_GPIO_WRITE 3 |
26 | #define LJCA_GPIO_INT_EVENT 4 |
27 | #define LJCA_GPIO_INT_MASK 5 |
28 | #define LJCA_GPIO_INT_UNMASK 6 |
29 | |
30 | #define LJCA_GPIO_CONF_DISABLE BIT(0) |
31 | #define LJCA_GPIO_CONF_INPUT BIT(1) |
32 | #define LJCA_GPIO_CONF_OUTPUT BIT(2) |
33 | #define LJCA_GPIO_CONF_PULLUP BIT(3) |
34 | #define LJCA_GPIO_CONF_PULLDOWN BIT(4) |
35 | #define LJCA_GPIO_CONF_DEFAULT BIT(5) |
36 | #define LJCA_GPIO_CONF_INTERRUPT BIT(6) |
37 | #define LJCA_GPIO_INT_TYPE BIT(7) |
38 | |
39 | #define LJCA_GPIO_CONF_EDGE FIELD_PREP(LJCA_GPIO_INT_TYPE, 1) |
40 | #define LJCA_GPIO_CONF_LEVEL FIELD_PREP(LJCA_GPIO_INT_TYPE, 0) |
41 | |
42 | /* Intentional overlap with PULLUP / PULLDOWN */ |
43 | #define LJCA_GPIO_CONF_SET BIT(3) |
44 | #define LJCA_GPIO_CONF_CLR BIT(4) |
45 | |
46 | #define LJCA_GPIO_BUF_SIZE 60u |
47 | |
48 | struct ljca_gpio_op { |
49 | u8 index; |
50 | u8 value; |
51 | } __packed; |
52 | |
53 | struct ljca_gpio_packet { |
54 | u8 num; |
55 | struct ljca_gpio_op item[] __counted_by(num); |
56 | } __packed; |
57 | |
58 | struct ljca_gpio_dev { |
59 | struct ljca_client *ljca; |
60 | struct gpio_chip gc; |
61 | struct ljca_gpio_info *gpio_info; |
62 | DECLARE_BITMAP(unmasked_irqs, LJCA_MAX_GPIO_NUM); |
63 | DECLARE_BITMAP(enabled_irqs, LJCA_MAX_GPIO_NUM); |
64 | DECLARE_BITMAP(reenable_irqs, LJCA_MAX_GPIO_NUM); |
65 | DECLARE_BITMAP(output_enabled, LJCA_MAX_GPIO_NUM); |
66 | u8 *connect_mode; |
67 | /* protect irq bus */ |
68 | struct mutex irq_lock; |
69 | struct work_struct work; |
70 | /* protect package transfer to hardware */ |
71 | struct mutex trans_lock; |
72 | |
73 | u8 obuf[LJCA_GPIO_BUF_SIZE]; |
74 | u8 ibuf[LJCA_GPIO_BUF_SIZE]; |
75 | }; |
76 | |
77 | static int ljca_gpio_config(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id, |
78 | u8 config) |
79 | { |
80 | struct ljca_gpio_packet *packet = |
81 | (struct ljca_gpio_packet *)ljca_gpio->obuf; |
82 | int ret; |
83 | |
84 | mutex_lock(&ljca_gpio->trans_lock); |
85 | packet->item[0].index = gpio_id; |
86 | packet->item[0].value = config | ljca_gpio->connect_mode[gpio_id]; |
87 | packet->num = 1; |
88 | |
89 | ret = ljca_transfer(client: ljca_gpio->ljca, LJCA_GPIO_CONFIG, obuf: (u8 *)packet, |
90 | struct_size(packet, item, packet->num), NULL, ibuf_len: 0); |
91 | mutex_unlock(lock: &ljca_gpio->trans_lock); |
92 | |
93 | return ret < 0 ? ret : 0; |
94 | } |
95 | |
96 | static int ljca_gpio_read(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id) |
97 | { |
98 | struct ljca_gpio_packet *ack_packet = |
99 | (struct ljca_gpio_packet *)ljca_gpio->ibuf; |
100 | struct ljca_gpio_packet *packet = |
101 | (struct ljca_gpio_packet *)ljca_gpio->obuf; |
102 | int ret; |
103 | |
104 | mutex_lock(&ljca_gpio->trans_lock); |
105 | packet->num = 1; |
106 | packet->item[0].index = gpio_id; |
107 | ret = ljca_transfer(client: ljca_gpio->ljca, LJCA_GPIO_READ, obuf: (u8 *)packet, |
108 | struct_size(packet, item, packet->num), |
109 | ibuf: ljca_gpio->ibuf, LJCA_GPIO_BUF_SIZE); |
110 | |
111 | if (ret <= 0 || ack_packet->num != packet->num) { |
112 | dev_err(&ljca_gpio->ljca->auxdev.dev, |
113 | "read package error, gpio_id: %u num: %u ret: %d\n" , |
114 | gpio_id, ack_packet->num, ret); |
115 | ret = ret < 0 ? ret : -EIO; |
116 | } |
117 | mutex_unlock(lock: &ljca_gpio->trans_lock); |
118 | |
119 | return ret < 0 ? ret : ack_packet->item[0].value > 0; |
120 | } |
121 | |
122 | static int ljca_gpio_write(struct ljca_gpio_dev *ljca_gpio, u8 gpio_id, int value) |
123 | { |
124 | struct ljca_gpio_packet *packet = |
125 | (struct ljca_gpio_packet *)ljca_gpio->obuf; |
126 | int ret; |
127 | |
128 | mutex_lock(&ljca_gpio->trans_lock); |
129 | packet->num = 1; |
130 | packet->item[0].index = gpio_id; |
131 | packet->item[0].value = value & 1; |
132 | |
133 | ret = ljca_transfer(client: ljca_gpio->ljca, LJCA_GPIO_WRITE, obuf: (u8 *)packet, |
134 | struct_size(packet, item, packet->num), NULL, ibuf_len: 0); |
135 | mutex_unlock(lock: &ljca_gpio->trans_lock); |
136 | |
137 | return ret < 0 ? ret : 0; |
138 | } |
139 | |
140 | static int ljca_gpio_get_value(struct gpio_chip *chip, unsigned int offset) |
141 | { |
142 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc: chip); |
143 | |
144 | return ljca_gpio_read(ljca_gpio, gpio_id: offset); |
145 | } |
146 | |
147 | static void ljca_gpio_set_value(struct gpio_chip *chip, unsigned int offset, |
148 | int val) |
149 | { |
150 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc: chip); |
151 | int ret; |
152 | |
153 | ret = ljca_gpio_write(ljca_gpio, gpio_id: offset, value: val); |
154 | if (ret) |
155 | dev_err(chip->parent, |
156 | "set value failed offset: %u val: %d ret: %d\n" , |
157 | offset, val, ret); |
158 | } |
159 | |
160 | static int ljca_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) |
161 | { |
162 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc: chip); |
163 | u8 config = LJCA_GPIO_CONF_INPUT | LJCA_GPIO_CONF_CLR; |
164 | int ret; |
165 | |
166 | ret = ljca_gpio_config(ljca_gpio, gpio_id: offset, config); |
167 | if (ret) |
168 | return ret; |
169 | |
170 | clear_bit(nr: offset, addr: ljca_gpio->output_enabled); |
171 | |
172 | return 0; |
173 | } |
174 | |
175 | static int ljca_gpio_direction_output(struct gpio_chip *chip, |
176 | unsigned int offset, int val) |
177 | { |
178 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc: chip); |
179 | u8 config = LJCA_GPIO_CONF_OUTPUT | LJCA_GPIO_CONF_CLR; |
180 | int ret; |
181 | |
182 | ret = ljca_gpio_config(ljca_gpio, gpio_id: offset, config); |
183 | if (ret) |
184 | return ret; |
185 | |
186 | ljca_gpio_set_value(chip, offset, val); |
187 | set_bit(nr: offset, addr: ljca_gpio->output_enabled); |
188 | |
189 | return 0; |
190 | } |
191 | |
192 | static int ljca_gpio_get_direction(struct gpio_chip *chip, unsigned int offset) |
193 | { |
194 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc: chip); |
195 | |
196 | if (test_bit(offset, ljca_gpio->output_enabled)) |
197 | return GPIO_LINE_DIRECTION_OUT; |
198 | |
199 | return GPIO_LINE_DIRECTION_IN; |
200 | } |
201 | |
202 | static int ljca_gpio_set_config(struct gpio_chip *chip, unsigned int offset, |
203 | unsigned long config) |
204 | { |
205 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc: chip); |
206 | |
207 | ljca_gpio->connect_mode[offset] = 0; |
208 | switch (pinconf_to_config_param(config)) { |
209 | case PIN_CONFIG_BIAS_PULL_UP: |
210 | ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLUP; |
211 | break; |
212 | case PIN_CONFIG_BIAS_PULL_DOWN: |
213 | ljca_gpio->connect_mode[offset] |= LJCA_GPIO_CONF_PULLDOWN; |
214 | break; |
215 | case PIN_CONFIG_DRIVE_PUSH_PULL: |
216 | case PIN_CONFIG_PERSIST_STATE: |
217 | break; |
218 | default: |
219 | return -ENOTSUPP; |
220 | } |
221 | |
222 | return 0; |
223 | } |
224 | |
225 | static int ljca_gpio_init_valid_mask(struct gpio_chip *chip, |
226 | unsigned long *valid_mask, |
227 | unsigned int ngpios) |
228 | { |
229 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc: chip); |
230 | |
231 | WARN_ON_ONCE(ngpios != ljca_gpio->gpio_info->num); |
232 | bitmap_copy(dst: valid_mask, src: ljca_gpio->gpio_info->valid_pin_map, nbits: ngpios); |
233 | |
234 | return 0; |
235 | } |
236 | |
237 | static void ljca_gpio_irq_init_valid_mask(struct gpio_chip *chip, |
238 | unsigned long *valid_mask, |
239 | unsigned int ngpios) |
240 | { |
241 | ljca_gpio_init_valid_mask(chip, valid_mask, ngpios); |
242 | } |
243 | |
244 | static int ljca_enable_irq(struct ljca_gpio_dev *ljca_gpio, int gpio_id, |
245 | bool enable) |
246 | { |
247 | struct ljca_gpio_packet *packet = |
248 | (struct ljca_gpio_packet *)ljca_gpio->obuf; |
249 | int ret; |
250 | |
251 | mutex_lock(&ljca_gpio->trans_lock); |
252 | packet->num = 1; |
253 | packet->item[0].index = gpio_id; |
254 | packet->item[0].value = 0; |
255 | |
256 | ret = ljca_transfer(client: ljca_gpio->ljca, |
257 | cmd: enable ? LJCA_GPIO_INT_UNMASK : LJCA_GPIO_INT_MASK, |
258 | obuf: (u8 *)packet, struct_size(packet, item, packet->num), |
259 | NULL, ibuf_len: 0); |
260 | mutex_unlock(lock: &ljca_gpio->trans_lock); |
261 | |
262 | return ret < 0 ? ret : 0; |
263 | } |
264 | |
265 | static void ljca_gpio_async(struct work_struct *work) |
266 | { |
267 | struct ljca_gpio_dev *ljca_gpio = |
268 | container_of(work, struct ljca_gpio_dev, work); |
269 | int gpio_id, unmasked; |
270 | |
271 | for_each_set_bit(gpio_id, ljca_gpio->reenable_irqs, ljca_gpio->gc.ngpio) { |
272 | clear_bit(nr: gpio_id, addr: ljca_gpio->reenable_irqs); |
273 | unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs); |
274 | if (unmasked) |
275 | ljca_enable_irq(ljca_gpio, gpio_id, enable: true); |
276 | } |
277 | } |
278 | |
279 | static void ljca_gpio_event_cb(void *context, u8 cmd, const void *evt_data, |
280 | int len) |
281 | { |
282 | const struct ljca_gpio_packet *packet = evt_data; |
283 | struct ljca_gpio_dev *ljca_gpio = context; |
284 | int i, irq; |
285 | |
286 | if (cmd != LJCA_GPIO_INT_EVENT) |
287 | return; |
288 | |
289 | for (i = 0; i < packet->num; i++) { |
290 | irq = irq_find_mapping(domain: ljca_gpio->gc.irq.domain, |
291 | hwirq: packet->item[i].index); |
292 | if (!irq) { |
293 | dev_err(ljca_gpio->gc.parent, |
294 | "gpio_id %u does not mapped to IRQ yet\n" , |
295 | packet->item[i].index); |
296 | return; |
297 | } |
298 | |
299 | generic_handle_domain_irq(domain: ljca_gpio->gc.irq.domain, hwirq: irq); |
300 | set_bit(nr: packet->item[i].index, addr: ljca_gpio->reenable_irqs); |
301 | } |
302 | |
303 | schedule_work(work: &ljca_gpio->work); |
304 | } |
305 | |
306 | static void ljca_irq_unmask(struct irq_data *irqd) |
307 | { |
308 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d: irqd); |
309 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); |
310 | int gpio_id = irqd_to_hwirq(d: irqd); |
311 | |
312 | gpiochip_enable_irq(gc, offset: gpio_id); |
313 | set_bit(nr: gpio_id, addr: ljca_gpio->unmasked_irqs); |
314 | } |
315 | |
316 | static void ljca_irq_mask(struct irq_data *irqd) |
317 | { |
318 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d: irqd); |
319 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); |
320 | int gpio_id = irqd_to_hwirq(d: irqd); |
321 | |
322 | clear_bit(nr: gpio_id, addr: ljca_gpio->unmasked_irqs); |
323 | gpiochip_disable_irq(gc, offset: gpio_id); |
324 | } |
325 | |
326 | static int ljca_irq_set_type(struct irq_data *irqd, unsigned int type) |
327 | { |
328 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d: irqd); |
329 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); |
330 | int gpio_id = irqd_to_hwirq(d: irqd); |
331 | |
332 | ljca_gpio->connect_mode[gpio_id] = LJCA_GPIO_CONF_INTERRUPT; |
333 | switch (type) { |
334 | case IRQ_TYPE_LEVEL_HIGH: |
335 | ljca_gpio->connect_mode[gpio_id] |= |
336 | (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLUP); |
337 | break; |
338 | case IRQ_TYPE_LEVEL_LOW: |
339 | ljca_gpio->connect_mode[gpio_id] |= |
340 | (LJCA_GPIO_CONF_LEVEL | LJCA_GPIO_CONF_PULLDOWN); |
341 | break; |
342 | case IRQ_TYPE_EDGE_BOTH: |
343 | break; |
344 | case IRQ_TYPE_EDGE_RISING: |
345 | ljca_gpio->connect_mode[gpio_id] |= |
346 | (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLUP); |
347 | break; |
348 | case IRQ_TYPE_EDGE_FALLING: |
349 | ljca_gpio->connect_mode[gpio_id] |= |
350 | (LJCA_GPIO_CONF_EDGE | LJCA_GPIO_CONF_PULLDOWN); |
351 | break; |
352 | default: |
353 | return -EINVAL; |
354 | } |
355 | |
356 | return 0; |
357 | } |
358 | |
359 | static void ljca_irq_bus_lock(struct irq_data *irqd) |
360 | { |
361 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d: irqd); |
362 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); |
363 | |
364 | mutex_lock(&ljca_gpio->irq_lock); |
365 | } |
366 | |
367 | static void ljca_irq_bus_unlock(struct irq_data *irqd) |
368 | { |
369 | struct gpio_chip *gc = irq_data_get_irq_chip_data(d: irqd); |
370 | struct ljca_gpio_dev *ljca_gpio = gpiochip_get_data(gc); |
371 | int gpio_id = irqd_to_hwirq(d: irqd); |
372 | int enabled, unmasked; |
373 | |
374 | enabled = test_bit(gpio_id, ljca_gpio->enabled_irqs); |
375 | unmasked = test_bit(gpio_id, ljca_gpio->unmasked_irqs); |
376 | |
377 | if (enabled != unmasked) { |
378 | if (unmasked) { |
379 | ljca_gpio_config(ljca_gpio, gpio_id, config: 0); |
380 | ljca_enable_irq(ljca_gpio, gpio_id, enable: true); |
381 | set_bit(nr: gpio_id, addr: ljca_gpio->enabled_irqs); |
382 | } else { |
383 | ljca_enable_irq(ljca_gpio, gpio_id, enable: false); |
384 | clear_bit(nr: gpio_id, addr: ljca_gpio->enabled_irqs); |
385 | } |
386 | } |
387 | |
388 | mutex_unlock(lock: &ljca_gpio->irq_lock); |
389 | } |
390 | |
391 | static const struct irq_chip ljca_gpio_irqchip = { |
392 | .name = "ljca-irq" , |
393 | .irq_mask = ljca_irq_mask, |
394 | .irq_unmask = ljca_irq_unmask, |
395 | .irq_set_type = ljca_irq_set_type, |
396 | .irq_bus_lock = ljca_irq_bus_lock, |
397 | .irq_bus_sync_unlock = ljca_irq_bus_unlock, |
398 | .flags = IRQCHIP_IMMUTABLE, |
399 | GPIOCHIP_IRQ_RESOURCE_HELPERS, |
400 | }; |
401 | |
402 | static int ljca_gpio_probe(struct auxiliary_device *auxdev, |
403 | const struct auxiliary_device_id *aux_dev_id) |
404 | { |
405 | struct ljca_client *ljca = auxiliary_dev_to_ljca_client(auxdev); |
406 | struct ljca_gpio_dev *ljca_gpio; |
407 | struct gpio_irq_chip *girq; |
408 | int ret; |
409 | |
410 | ljca_gpio = devm_kzalloc(dev: &auxdev->dev, size: sizeof(*ljca_gpio), GFP_KERNEL); |
411 | if (!ljca_gpio) |
412 | return -ENOMEM; |
413 | |
414 | ljca_gpio->ljca = ljca; |
415 | ljca_gpio->gpio_info = dev_get_platdata(dev: &auxdev->dev); |
416 | ljca_gpio->connect_mode = devm_kcalloc(dev: &auxdev->dev, |
417 | n: ljca_gpio->gpio_info->num, |
418 | size: sizeof(*ljca_gpio->connect_mode), |
419 | GFP_KERNEL); |
420 | if (!ljca_gpio->connect_mode) |
421 | return -ENOMEM; |
422 | |
423 | mutex_init(&ljca_gpio->irq_lock); |
424 | mutex_init(&ljca_gpio->trans_lock); |
425 | ljca_gpio->gc.direction_input = ljca_gpio_direction_input; |
426 | ljca_gpio->gc.direction_output = ljca_gpio_direction_output; |
427 | ljca_gpio->gc.get_direction = ljca_gpio_get_direction; |
428 | ljca_gpio->gc.get = ljca_gpio_get_value; |
429 | ljca_gpio->gc.set = ljca_gpio_set_value; |
430 | ljca_gpio->gc.set_config = ljca_gpio_set_config; |
431 | ljca_gpio->gc.init_valid_mask = ljca_gpio_init_valid_mask; |
432 | ljca_gpio->gc.can_sleep = true; |
433 | ljca_gpio->gc.parent = &auxdev->dev; |
434 | |
435 | ljca_gpio->gc.base = -1; |
436 | ljca_gpio->gc.ngpio = ljca_gpio->gpio_info->num; |
437 | ljca_gpio->gc.label = ACPI_COMPANION(&auxdev->dev) ? |
438 | acpi_dev_name(ACPI_COMPANION(&auxdev->dev)) : |
439 | dev_name(dev: &auxdev->dev); |
440 | ljca_gpio->gc.owner = THIS_MODULE; |
441 | |
442 | auxiliary_set_drvdata(auxdev, data: ljca_gpio); |
443 | ljca_register_event_cb(client: ljca, event_cb: ljca_gpio_event_cb, context: ljca_gpio); |
444 | |
445 | girq = &ljca_gpio->gc.irq; |
446 | gpio_irq_chip_set_chip(girq, chip: &ljca_gpio_irqchip); |
447 | girq->parent_handler = NULL; |
448 | girq->num_parents = 0; |
449 | girq->parents = NULL; |
450 | girq->default_type = IRQ_TYPE_NONE; |
451 | girq->handler = handle_simple_irq; |
452 | girq->init_valid_mask = ljca_gpio_irq_init_valid_mask; |
453 | |
454 | INIT_WORK(&ljca_gpio->work, ljca_gpio_async); |
455 | ret = gpiochip_add_data(&ljca_gpio->gc, ljca_gpio); |
456 | if (ret) { |
457 | ljca_unregister_event_cb(client: ljca); |
458 | mutex_destroy(lock: &ljca_gpio->irq_lock); |
459 | mutex_destroy(lock: &ljca_gpio->trans_lock); |
460 | } |
461 | |
462 | return ret; |
463 | } |
464 | |
465 | static void ljca_gpio_remove(struct auxiliary_device *auxdev) |
466 | { |
467 | struct ljca_gpio_dev *ljca_gpio = auxiliary_get_drvdata(auxdev); |
468 | |
469 | gpiochip_remove(gc: &ljca_gpio->gc); |
470 | ljca_unregister_event_cb(client: ljca_gpio->ljca); |
471 | cancel_work_sync(work: &ljca_gpio->work); |
472 | mutex_destroy(lock: &ljca_gpio->irq_lock); |
473 | mutex_destroy(lock: &ljca_gpio->trans_lock); |
474 | } |
475 | |
476 | static const struct auxiliary_device_id ljca_gpio_id_table[] = { |
477 | { "usb_ljca.ljca-gpio" , 0 }, |
478 | { /* sentinel */ }, |
479 | }; |
480 | MODULE_DEVICE_TABLE(auxiliary, ljca_gpio_id_table); |
481 | |
482 | static struct auxiliary_driver ljca_gpio_driver = { |
483 | .probe = ljca_gpio_probe, |
484 | .remove = ljca_gpio_remove, |
485 | .id_table = ljca_gpio_id_table, |
486 | }; |
487 | module_auxiliary_driver(ljca_gpio_driver); |
488 | |
489 | MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>" ); |
490 | MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>" ); |
491 | MODULE_AUTHOR("Lixu Zhang <lixu.zhang@intel.com>" ); |
492 | MODULE_DESCRIPTION("Intel La Jolla Cove Adapter USB-GPIO driver" ); |
493 | MODULE_LICENSE("GPL" ); |
494 | MODULE_IMPORT_NS(LJCA); |
495 | |