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15#include <linux/kernel.h>
16#include <linux/errno.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/types.h>
20#include <linux/mutex.h>
21#include <linux/platform_device.h>
22
23#include <linux/usb.h>
24#include <linux/gpio.h>
25
26#include <linux/mfd/viperboard.h>
27
28#define VPRBRD_GPIOA_CLK_1MHZ 0
29#define VPRBRD_GPIOA_CLK_100KHZ 1
30#define VPRBRD_GPIOA_CLK_10KHZ 2
31#define VPRBRD_GPIOA_CLK_1KHZ 3
32#define VPRBRD_GPIOA_CLK_100HZ 4
33#define VPRBRD_GPIOA_CLK_10HZ 5
34
35#define VPRBRD_GPIOA_FREQ_DEFAULT 1000
36
37#define VPRBRD_GPIOA_CMD_CONT 0x00
38#define VPRBRD_GPIOA_CMD_PULSE 0x01
39#define VPRBRD_GPIOA_CMD_PWM 0x02
40#define VPRBRD_GPIOA_CMD_SETOUT 0x03
41#define VPRBRD_GPIOA_CMD_SETIN 0x04
42#define VPRBRD_GPIOA_CMD_SETINT 0x05
43#define VPRBRD_GPIOA_CMD_GETIN 0x06
44
45#define VPRBRD_GPIOB_CMD_SETDIR 0x00
46#define VPRBRD_GPIOB_CMD_SETVAL 0x01
47
48struct vprbrd_gpioa_msg {
49 u8 cmd;
50 u8 clk;
51 u8 offset;
52 u8 t1;
53 u8 t2;
54 u8 invert;
55 u8 pwmlevel;
56 u8 outval;
57 u8 risefall;
58 u8 answer;
59 u8 __fill;
60} __packed;
61
62struct vprbrd_gpiob_msg {
63 u8 cmd;
64 u16 val;
65 u16 mask;
66} __packed;
67
68struct vprbrd_gpio {
69 struct gpio_chip gpioa;
70 u32 gpioa_out;
71 u32 gpioa_val;
72 struct gpio_chip gpiob;
73 u32 gpiob_out;
74 u32 gpiob_val;
75 struct vprbrd *vb;
76};
77
78
79static unsigned char gpioa_clk;
80static unsigned int gpioa_freq = VPRBRD_GPIOA_FREQ_DEFAULT;
81module_param(gpioa_freq, uint, 0);
82MODULE_PARM_DESC(gpioa_freq,
83 "gpio-a sampling freq in Hz (default is 1000Hz) valid values: 10, 100, 1000, 10000, 100000, 1000000");
84
85
86
87static int vprbrd_gpioa_get(struct gpio_chip *chip,
88 unsigned offset)
89{
90 int ret, answer, error = 0;
91 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
92 struct vprbrd *vb = gpio->vb;
93 struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
94
95
96 if (gpio->gpioa_out & (1 << offset))
97 return !!(gpio->gpioa_val & (1 << offset));
98
99 mutex_lock(&vb->lock);
100
101 gamsg->cmd = VPRBRD_GPIOA_CMD_GETIN;
102 gamsg->clk = 0x00;
103 gamsg->offset = offset;
104 gamsg->t1 = 0x00;
105 gamsg->t2 = 0x00;
106 gamsg->invert = 0x00;
107 gamsg->pwmlevel = 0x00;
108 gamsg->outval = 0x00;
109 gamsg->risefall = 0x00;
110 gamsg->answer = 0x00;
111 gamsg->__fill = 0x00;
112
113 ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
114 VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
115 0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
116 VPRBRD_USB_TIMEOUT_MS);
117 if (ret != sizeof(struct vprbrd_gpioa_msg))
118 error = -EREMOTEIO;
119
120 ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
121 VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_IN, 0x0000,
122 0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
123 VPRBRD_USB_TIMEOUT_MS);
124 answer = gamsg->answer & 0x01;
125
126 mutex_unlock(&vb->lock);
127
128 if (ret != sizeof(struct vprbrd_gpioa_msg))
129 error = -EREMOTEIO;
130
131 if (error)
132 return error;
133
134 return answer;
135}
136
137static void vprbrd_gpioa_set(struct gpio_chip *chip,
138 unsigned offset, int value)
139{
140 int ret;
141 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
142 struct vprbrd *vb = gpio->vb;
143 struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
144
145 if (gpio->gpioa_out & (1 << offset)) {
146 if (value)
147 gpio->gpioa_val |= (1 << offset);
148 else
149 gpio->gpioa_val &= ~(1 << offset);
150
151 mutex_lock(&vb->lock);
152
153 gamsg->cmd = VPRBRD_GPIOA_CMD_SETOUT;
154 gamsg->clk = 0x00;
155 gamsg->offset = offset;
156 gamsg->t1 = 0x00;
157 gamsg->t2 = 0x00;
158 gamsg->invert = 0x00;
159 gamsg->pwmlevel = 0x00;
160 gamsg->outval = value;
161 gamsg->risefall = 0x00;
162 gamsg->answer = 0x00;
163 gamsg->__fill = 0x00;
164
165 ret = usb_control_msg(vb->usb_dev,
166 usb_sndctrlpipe(vb->usb_dev, 0),
167 VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT,
168 0x0000, 0x0000, gamsg,
169 sizeof(struct vprbrd_gpioa_msg), VPRBRD_USB_TIMEOUT_MS);
170
171 mutex_unlock(&vb->lock);
172
173 if (ret != sizeof(struct vprbrd_gpioa_msg))
174 dev_err(chip->parent, "usb error setting pin value\n");
175 }
176}
177
178static int vprbrd_gpioa_direction_input(struct gpio_chip *chip,
179 unsigned offset)
180{
181 int ret;
182 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
183 struct vprbrd *vb = gpio->vb;
184 struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
185
186 gpio->gpioa_out &= ~(1 << offset);
187
188 mutex_lock(&vb->lock);
189
190 gamsg->cmd = VPRBRD_GPIOA_CMD_SETIN;
191 gamsg->clk = gpioa_clk;
192 gamsg->offset = offset;
193 gamsg->t1 = 0x00;
194 gamsg->t2 = 0x00;
195 gamsg->invert = 0x00;
196 gamsg->pwmlevel = 0x00;
197 gamsg->outval = 0x00;
198 gamsg->risefall = 0x00;
199 gamsg->answer = 0x00;
200 gamsg->__fill = 0x00;
201
202 ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
203 VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
204 0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
205 VPRBRD_USB_TIMEOUT_MS);
206
207 mutex_unlock(&vb->lock);
208
209 if (ret != sizeof(struct vprbrd_gpioa_msg))
210 return -EREMOTEIO;
211
212 return 0;
213}
214
215static int vprbrd_gpioa_direction_output(struct gpio_chip *chip,
216 unsigned offset, int value)
217{
218 int ret;
219 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
220 struct vprbrd *vb = gpio->vb;
221 struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
222
223 gpio->gpioa_out |= (1 << offset);
224 if (value)
225 gpio->gpioa_val |= (1 << offset);
226 else
227 gpio->gpioa_val &= ~(1 << offset);
228
229 mutex_lock(&vb->lock);
230
231 gamsg->cmd = VPRBRD_GPIOA_CMD_SETOUT;
232 gamsg->clk = 0x00;
233 gamsg->offset = offset;
234 gamsg->t1 = 0x00;
235 gamsg->t2 = 0x00;
236 gamsg->invert = 0x00;
237 gamsg->pwmlevel = 0x00;
238 gamsg->outval = value;
239 gamsg->risefall = 0x00;
240 gamsg->answer = 0x00;
241 gamsg->__fill = 0x00;
242
243 ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
244 VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
245 0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
246 VPRBRD_USB_TIMEOUT_MS);
247
248 mutex_unlock(&vb->lock);
249
250 if (ret != sizeof(struct vprbrd_gpioa_msg))
251 return -EREMOTEIO;
252
253 return 0;
254}
255
256
257
258
259
260static int vprbrd_gpiob_setdir(struct vprbrd *vb, unsigned offset,
261 unsigned dir)
262{
263 struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
264 int ret;
265
266 gbmsg->cmd = VPRBRD_GPIOB_CMD_SETDIR;
267 gbmsg->val = cpu_to_be16(dir << offset);
268 gbmsg->mask = cpu_to_be16(0x0001 << offset);
269
270 ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
271 VPRBRD_USB_REQUEST_GPIOB, VPRBRD_USB_TYPE_OUT, 0x0000,
272 0x0000, gbmsg, sizeof(struct vprbrd_gpiob_msg),
273 VPRBRD_USB_TIMEOUT_MS);
274
275 if (ret != sizeof(struct vprbrd_gpiob_msg))
276 return -EREMOTEIO;
277
278 return 0;
279}
280
281static int vprbrd_gpiob_get(struct gpio_chip *chip,
282 unsigned offset)
283{
284 int ret;
285 u16 val;
286 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
287 struct vprbrd *vb = gpio->vb;
288 struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
289
290
291 if (gpio->gpiob_out & (1 << offset))
292 return gpio->gpiob_val & (1 << offset);
293
294 mutex_lock(&vb->lock);
295
296 ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
297 VPRBRD_USB_REQUEST_GPIOB, VPRBRD_USB_TYPE_IN, 0x0000,
298 0x0000, gbmsg, sizeof(struct vprbrd_gpiob_msg),
299 VPRBRD_USB_TIMEOUT_MS);
300 val = gbmsg->val;
301
302 mutex_unlock(&vb->lock);
303
304 if (ret != sizeof(struct vprbrd_gpiob_msg))
305 return ret;
306
307
308 gpio->gpiob_val = be16_to_cpu(val);
309
310 return (gpio->gpiob_val >> offset) & 0x1;
311}
312
313static void vprbrd_gpiob_set(struct gpio_chip *chip,
314 unsigned offset, int value)
315{
316 int ret;
317 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
318 struct vprbrd *vb = gpio->vb;
319 struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
320
321 if (gpio->gpiob_out & (1 << offset)) {
322 if (value)
323 gpio->gpiob_val |= (1 << offset);
324 else
325 gpio->gpiob_val &= ~(1 << offset);
326
327 mutex_lock(&vb->lock);
328
329 gbmsg->cmd = VPRBRD_GPIOB_CMD_SETVAL;
330 gbmsg->val = cpu_to_be16(value << offset);
331 gbmsg->mask = cpu_to_be16(0x0001 << offset);
332
333 ret = usb_control_msg(vb->usb_dev,
334 usb_sndctrlpipe(vb->usb_dev, 0),
335 VPRBRD_USB_REQUEST_GPIOB, VPRBRD_USB_TYPE_OUT,
336 0x0000, 0x0000, gbmsg,
337 sizeof(struct vprbrd_gpiob_msg), VPRBRD_USB_TIMEOUT_MS);
338
339 mutex_unlock(&vb->lock);
340
341 if (ret != sizeof(struct vprbrd_gpiob_msg))
342 dev_err(chip->parent, "usb error setting pin value\n");
343 }
344}
345
346static int vprbrd_gpiob_direction_input(struct gpio_chip *chip,
347 unsigned offset)
348{
349 int ret;
350 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
351 struct vprbrd *vb = gpio->vb;
352
353 gpio->gpiob_out &= ~(1 << offset);
354
355 mutex_lock(&vb->lock);
356
357 ret = vprbrd_gpiob_setdir(vb, offset, 0);
358
359 mutex_unlock(&vb->lock);
360
361 if (ret)
362 dev_err(chip->parent, "usb error setting pin to input\n");
363
364 return ret;
365}
366
367static int vprbrd_gpiob_direction_output(struct gpio_chip *chip,
368 unsigned offset, int value)
369{
370 int ret;
371 struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
372 struct vprbrd *vb = gpio->vb;
373
374 gpio->gpiob_out |= (1 << offset);
375
376 mutex_lock(&vb->lock);
377
378 ret = vprbrd_gpiob_setdir(vb, offset, 1);
379 if (ret)
380 dev_err(chip->parent, "usb error setting pin to output\n");
381
382 mutex_unlock(&vb->lock);
383
384 vprbrd_gpiob_set(chip, offset, value);
385
386 return ret;
387}
388
389
390
391static int vprbrd_gpio_probe(struct platform_device *pdev)
392{
393 struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent);
394 struct vprbrd_gpio *vb_gpio;
395 int ret;
396
397 vb_gpio = devm_kzalloc(&pdev->dev, sizeof(*vb_gpio), GFP_KERNEL);
398 if (vb_gpio == NULL)
399 return -ENOMEM;
400
401 vb_gpio->vb = vb;
402
403 vb_gpio->gpioa.label = "viperboard gpio a";
404 vb_gpio->gpioa.parent = &pdev->dev;
405 vb_gpio->gpioa.owner = THIS_MODULE;
406 vb_gpio->gpioa.base = -1;
407 vb_gpio->gpioa.ngpio = 16;
408 vb_gpio->gpioa.can_sleep = true;
409 vb_gpio->gpioa.set = vprbrd_gpioa_set;
410 vb_gpio->gpioa.get = vprbrd_gpioa_get;
411 vb_gpio->gpioa.direction_input = vprbrd_gpioa_direction_input;
412 vb_gpio->gpioa.direction_output = vprbrd_gpioa_direction_output;
413 ret = devm_gpiochip_add_data(&pdev->dev, &vb_gpio->gpioa, vb_gpio);
414 if (ret < 0) {
415 dev_err(vb_gpio->gpioa.parent, "could not add gpio a");
416 return ret;
417 }
418
419
420 vb_gpio->gpiob.label = "viperboard gpio b";
421 vb_gpio->gpiob.parent = &pdev->dev;
422 vb_gpio->gpiob.owner = THIS_MODULE;
423 vb_gpio->gpiob.base = -1;
424 vb_gpio->gpiob.ngpio = 16;
425 vb_gpio->gpiob.can_sleep = true;
426 vb_gpio->gpiob.set = vprbrd_gpiob_set;
427 vb_gpio->gpiob.get = vprbrd_gpiob_get;
428 vb_gpio->gpiob.direction_input = vprbrd_gpiob_direction_input;
429 vb_gpio->gpiob.direction_output = vprbrd_gpiob_direction_output;
430 ret = devm_gpiochip_add_data(&pdev->dev, &vb_gpio->gpiob, vb_gpio);
431 if (ret < 0) {
432 dev_err(vb_gpio->gpiob.parent, "could not add gpio b");
433 return ret;
434 }
435
436 platform_set_drvdata(pdev, vb_gpio);
437
438 return ret;
439}
440
441static struct platform_driver vprbrd_gpio_driver = {
442 .driver.name = "viperboard-gpio",
443 .probe = vprbrd_gpio_probe,
444};
445
446static int __init vprbrd_gpio_init(void)
447{
448 switch (gpioa_freq) {
449 case 1000000:
450 gpioa_clk = VPRBRD_GPIOA_CLK_1MHZ;
451 break;
452 case 100000:
453 gpioa_clk = VPRBRD_GPIOA_CLK_100KHZ;
454 break;
455 case 10000:
456 gpioa_clk = VPRBRD_GPIOA_CLK_10KHZ;
457 break;
458 case 1000:
459 gpioa_clk = VPRBRD_GPIOA_CLK_1KHZ;
460 break;
461 case 100:
462 gpioa_clk = VPRBRD_GPIOA_CLK_100HZ;
463 break;
464 case 10:
465 gpioa_clk = VPRBRD_GPIOA_CLK_10HZ;
466 break;
467 default:
468 pr_warn("invalid gpioa_freq (%d)\n", gpioa_freq);
469 gpioa_clk = VPRBRD_GPIOA_CLK_1KHZ;
470 }
471
472 return platform_driver_register(&vprbrd_gpio_driver);
473}
474subsys_initcall(vprbrd_gpio_init);
475
476static void __exit vprbrd_gpio_exit(void)
477{
478 platform_driver_unregister(&vprbrd_gpio_driver);
479}
480module_exit(vprbrd_gpio_exit);
481
482MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
483MODULE_DESCRIPTION("GPIO driver for Nano River Techs Viperboard");
484MODULE_LICENSE("GPL");
485MODULE_ALIAS("platform:viperboard-gpio");
486
