1 /*
2 * Linux V4L2 radio driver for the Griffin radioSHARK2 USB radio receiver
3 *
4 * Note the radioSHARK2 offers the audio through a regular USB audio device,
5 * this driver only handles the tuning.
6 *
7 * The info necessary to drive the shark2 was taken from the small userspace
8 * shark2.c program by Hisaaki Shibata, which he kindly placed in the Public
9 * Domain.
10 *
11 * Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 */
23
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/leds.h>
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/usb.h>
30 #include <linux/workqueue.h>
31 #include <media/v4l2-device.h>
32 #include "radio-tea5777.h"
33
34 #if defined(CONFIG_LEDS_CLASS) || \
35 (defined(CONFIG_LEDS_CLASS_MODULE) && defined(CONFIG_RADIO_SHARK2_MODULE))
36 #define SHARK_USE_LEDS 1
37 #endif
38
39 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
40 MODULE_DESCRIPTION("Griffin radioSHARK2, USB radio receiver driver");
41 MODULE_LICENSE("GPL");
42
43 static int debug;
44 module_param(debug, int, 0);
45 MODULE_PARM_DESC(debug, "Debug level (0-1)");
46
47 #define SHARK_IN_EP 0x83
48 #define SHARK_OUT_EP 0x05
49
50 #define TB_LEN 7
51 #define DRV_NAME "radioshark2"
52
53 #define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev)
54
55 enum { BLUE_LED, RED_LED, NO_LEDS };
56
57 struct shark_device {
58 struct usb_device *usbdev;
59 struct v4l2_device v4l2_dev;
60 struct radio_tea5777 tea;
61
62 #ifdef SHARK_USE_LEDS
63 struct work_struct led_work;
64 struct led_classdev leds[NO_LEDS];
65 char led_names[NO_LEDS][32];
66 atomic_t brightness[NO_LEDS];
67 unsigned long brightness_new;
68 #endif
69
70 u8 *transfer_buffer;
71 };
72
73 static atomic_t shark_instance = ATOMIC_INIT(0);
74
shark_write_reg(struct radio_tea5777 * tea,u64 reg)75 static int shark_write_reg(struct radio_tea5777 *tea, u64 reg)
76 {
77 struct shark_device *shark = tea->private_data;
78 int i, res, actual_len;
79
80 memset(shark->transfer_buffer, 0, TB_LEN);
81 shark->transfer_buffer[0] = 0x81; /* Write register command */
82 for (i = 0; i < 6; i++)
83 shark->transfer_buffer[i + 1] = (reg >> (40 - i * 8)) & 0xff;
84
85 v4l2_dbg(1, debug, tea->v4l2_dev, "shark2-write: %*ph\n",
86 7, shark->transfer_buffer);
87
88 res = usb_interrupt_msg(shark->usbdev,
89 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
90 shark->transfer_buffer, TB_LEN,
91 &actual_len, 1000);
92 if (res < 0) {
93 v4l2_err(tea->v4l2_dev, "write error: %d\n", res);
94 return res;
95 }
96
97 return 0;
98 }
99
shark_read_reg(struct radio_tea5777 * tea,u32 * reg_ret)100 static int shark_read_reg(struct radio_tea5777 *tea, u32 *reg_ret)
101 {
102 struct shark_device *shark = tea->private_data;
103 int i, res, actual_len;
104 u32 reg = 0;
105
106 memset(shark->transfer_buffer, 0, TB_LEN);
107 shark->transfer_buffer[0] = 0x82;
108 res = usb_interrupt_msg(shark->usbdev,
109 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
110 shark->transfer_buffer, TB_LEN,
111 &actual_len, 1000);
112 if (res < 0) {
113 v4l2_err(tea->v4l2_dev, "request-read error: %d\n", res);
114 return res;
115 }
116
117 res = usb_interrupt_msg(shark->usbdev,
118 usb_rcvintpipe(shark->usbdev, SHARK_IN_EP),
119 shark->transfer_buffer, TB_LEN,
120 &actual_len, 1000);
121 if (res < 0) {
122 v4l2_err(tea->v4l2_dev, "read error: %d\n", res);
123 return res;
124 }
125
126 for (i = 0; i < 3; i++)
127 reg |= shark->transfer_buffer[i] << (16 - i * 8);
128
129 v4l2_dbg(1, debug, tea->v4l2_dev, "shark2-read: %*ph\n",
130 3, shark->transfer_buffer);
131
132 *reg_ret = reg;
133 return 0;
134 }
135
136 static const struct radio_tea5777_ops shark_tea_ops = {
137 .write_reg = shark_write_reg,
138 .read_reg = shark_read_reg,
139 };
140
141 #ifdef SHARK_USE_LEDS
shark_led_work(struct work_struct * work)142 static void shark_led_work(struct work_struct *work)
143 {
144 struct shark_device *shark =
145 container_of(work, struct shark_device, led_work);
146 int i, res, brightness, actual_len;
147
148 for (i = 0; i < 2; i++) {
149 if (!test_and_clear_bit(i, &shark->brightness_new))
150 continue;
151
152 brightness = atomic_read(&shark->brightness[i]);
153 memset(shark->transfer_buffer, 0, TB_LEN);
154 shark->transfer_buffer[0] = 0x83 + i;
155 shark->transfer_buffer[1] = brightness;
156 res = usb_interrupt_msg(shark->usbdev,
157 usb_sndintpipe(shark->usbdev,
158 SHARK_OUT_EP),
159 shark->transfer_buffer, TB_LEN,
160 &actual_len, 1000);
161 if (res < 0)
162 v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
163 shark->led_names[i], res);
164 }
165 }
166
shark_led_set_blue(struct led_classdev * led_cdev,enum led_brightness value)167 static void shark_led_set_blue(struct led_classdev *led_cdev,
168 enum led_brightness value)
169 {
170 struct shark_device *shark =
171 container_of(led_cdev, struct shark_device, leds[BLUE_LED]);
172
173 atomic_set(&shark->brightness[BLUE_LED], value);
174 set_bit(BLUE_LED, &shark->brightness_new);
175 schedule_work(&shark->led_work);
176 }
177
shark_led_set_red(struct led_classdev * led_cdev,enum led_brightness value)178 static void shark_led_set_red(struct led_classdev *led_cdev,
179 enum led_brightness value)
180 {
181 struct shark_device *shark =
182 container_of(led_cdev, struct shark_device, leds[RED_LED]);
183
184 atomic_set(&shark->brightness[RED_LED], value);
185 set_bit(RED_LED, &shark->brightness_new);
186 schedule_work(&shark->led_work);
187 }
188
189 static const struct led_classdev shark_led_templates[NO_LEDS] = {
190 [BLUE_LED] = {
191 .name = "%s:blue:",
192 .brightness = LED_OFF,
193 .max_brightness = 127,
194 .brightness_set = shark_led_set_blue,
195 },
196 [RED_LED] = {
197 .name = "%s:red:",
198 .brightness = LED_OFF,
199 .max_brightness = 1,
200 .brightness_set = shark_led_set_red,
201 },
202 };
203
shark_register_leds(struct shark_device * shark,struct device * dev)204 static int shark_register_leds(struct shark_device *shark, struct device *dev)
205 {
206 int i, retval;
207
208 atomic_set(&shark->brightness[BLUE_LED], 127);
209 INIT_WORK(&shark->led_work, shark_led_work);
210 for (i = 0; i < NO_LEDS; i++) {
211 shark->leds[i] = shark_led_templates[i];
212 snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
213 shark->leds[i].name, shark->v4l2_dev.name);
214 shark->leds[i].name = shark->led_names[i];
215 retval = led_classdev_register(dev, &shark->leds[i]);
216 if (retval) {
217 v4l2_err(&shark->v4l2_dev,
218 "couldn't register led: %s\n",
219 shark->led_names[i]);
220 return retval;
221 }
222 }
223 return 0;
224 }
225
shark_unregister_leds(struct shark_device * shark)226 static void shark_unregister_leds(struct shark_device *shark)
227 {
228 int i;
229
230 for (i = 0; i < NO_LEDS; i++)
231 led_classdev_unregister(&shark->leds[i]);
232
233 cancel_work_sync(&shark->led_work);
234 }
235
shark_resume_leds(struct shark_device * shark)236 static inline void shark_resume_leds(struct shark_device *shark)
237 {
238 int i;
239
240 for (i = 0; i < NO_LEDS; i++)
241 set_bit(i, &shark->brightness_new);
242
243 schedule_work(&shark->led_work);
244 }
245 #else
shark_register_leds(struct shark_device * shark,struct device * dev)246 static int shark_register_leds(struct shark_device *shark, struct device *dev)
247 {
248 v4l2_warn(&shark->v4l2_dev,
249 "CONFIG_LEDS_CLASS not enabled, LED support disabled\n");
250 return 0;
251 }
shark_unregister_leds(struct shark_device * shark)252 static inline void shark_unregister_leds(struct shark_device *shark) { }
shark_resume_leds(struct shark_device * shark)253 static inline void shark_resume_leds(struct shark_device *shark) { }
254 #endif
255
usb_shark_disconnect(struct usb_interface * intf)256 static void usb_shark_disconnect(struct usb_interface *intf)
257 {
258 struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
259 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
260
261 mutex_lock(&shark->tea.mutex);
262 v4l2_device_disconnect(&shark->v4l2_dev);
263 radio_tea5777_exit(&shark->tea);
264 mutex_unlock(&shark->tea.mutex);
265
266 shark_unregister_leds(shark);
267
268 v4l2_device_put(&shark->v4l2_dev);
269 }
270
usb_shark_release(struct v4l2_device * v4l2_dev)271 static void usb_shark_release(struct v4l2_device *v4l2_dev)
272 {
273 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
274
275 v4l2_device_unregister(&shark->v4l2_dev);
276 kfree(shark->transfer_buffer);
277 kfree(shark);
278 }
279
usb_shark_probe(struct usb_interface * intf,const struct usb_device_id * id)280 static int usb_shark_probe(struct usb_interface *intf,
281 const struct usb_device_id *id)
282 {
283 struct shark_device *shark;
284 int retval = -ENOMEM;
285
286 shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL);
287 if (!shark)
288 return retval;
289
290 shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
291 if (!shark->transfer_buffer)
292 goto err_alloc_buffer;
293
294 v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);
295
296 retval = shark_register_leds(shark, &intf->dev);
297 if (retval)
298 goto err_reg_leds;
299
300 shark->v4l2_dev.release = usb_shark_release;
301 retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev);
302 if (retval) {
303 v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n");
304 goto err_reg_dev;
305 }
306
307 shark->usbdev = interface_to_usbdev(intf);
308 shark->tea.v4l2_dev = &shark->v4l2_dev;
309 shark->tea.private_data = shark;
310 shark->tea.ops = &shark_tea_ops;
311 shark->tea.has_am = true;
312 shark->tea.write_before_read = true;
313 strlcpy(shark->tea.card, "Griffin radioSHARK2",
314 sizeof(shark->tea.card));
315 usb_make_path(shark->usbdev, shark->tea.bus_info,
316 sizeof(shark->tea.bus_info));
317
318 retval = radio_tea5777_init(&shark->tea, THIS_MODULE);
319 if (retval) {
320 v4l2_err(&shark->v4l2_dev, "couldn't init tea5777\n");
321 goto err_init_tea;
322 }
323
324 return 0;
325
326 err_init_tea:
327 v4l2_device_unregister(&shark->v4l2_dev);
328 err_reg_dev:
329 shark_unregister_leds(shark);
330 err_reg_leds:
331 kfree(shark->transfer_buffer);
332 err_alloc_buffer:
333 kfree(shark);
334
335 return retval;
336 }
337
338 #ifdef CONFIG_PM
usb_shark_suspend(struct usb_interface * intf,pm_message_t message)339 static int usb_shark_suspend(struct usb_interface *intf, pm_message_t message)
340 {
341 return 0;
342 }
343
usb_shark_resume(struct usb_interface * intf)344 static int usb_shark_resume(struct usb_interface *intf)
345 {
346 struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
347 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
348 int ret;
349
350 mutex_lock(&shark->tea.mutex);
351 ret = radio_tea5777_set_freq(&shark->tea);
352 mutex_unlock(&shark->tea.mutex);
353
354 shark_resume_leds(shark);
355
356 return ret;
357 }
358 #endif
359
360 /* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */
361 static const struct usb_device_id usb_shark_device_table[] = {
362 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION |
363 USB_DEVICE_ID_MATCH_INT_CLASS,
364 .idVendor = 0x077d,
365 .idProduct = 0x627a,
366 .bcdDevice_lo = 0x0010,
367 .bcdDevice_hi = 0x0010,
368 .bInterfaceClass = 3,
369 },
370 { }
371 };
372 MODULE_DEVICE_TABLE(usb, usb_shark_device_table);
373
374 static struct usb_driver usb_shark_driver = {
375 .name = DRV_NAME,
376 .probe = usb_shark_probe,
377 .disconnect = usb_shark_disconnect,
378 .id_table = usb_shark_device_table,
379 #ifdef CONFIG_PM
380 .suspend = usb_shark_suspend,
381 .resume = usb_shark_resume,
382 .reset_resume = usb_shark_resume,
383 #endif
384 };
385 module_usb_driver(usb_shark_driver);
386
