Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/media/radio/radio-shark.c

  1 /*
  2  * Linux V4L2 radio driver for the Griffin radioSHARK USB radio receiver
  3  *
  4  * Note the radioSHARK offers the audio through a regular USB audio device,
  5  * this driver only handles the tuning.
  6  *
  7  * The info necessary to drive the shark was taken from the small userspace
  8  * shark.c program by Michael Rolig, 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  * You should have received a copy of the GNU General Public License
 24  * along with this program; if not, write to the Free Software
 25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 26 */
 27 
 28 #include <linux/init.h>
 29 #include <linux/kernel.h>
 30 #include <linux/leds.h>
 31 #include <linux/module.h>
 32 #include <linux/slab.h>
 33 #include <linux/usb.h>
 34 #include <linux/workqueue.h>
 35 #include <media/v4l2-device.h>
 36 #include <media/tea575x.h>
 37 
 38 #if defined(CONFIG_LEDS_CLASS) || \
 39     (defined(CONFIG_LEDS_CLASS_MODULE) && defined(CONFIG_RADIO_SHARK_MODULE))
 40 #define SHARK_USE_LEDS 1
 41 #endif
 42 
 43 /*
 44  * Version Information
 45  */
 46 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 47 MODULE_DESCRIPTION("Griffin radioSHARK, USB radio receiver driver");
 48 MODULE_LICENSE("GPL");
 49 
 50 #define SHARK_IN_EP             0x83
 51 #define SHARK_OUT_EP            0x05
 52 
 53 #define TEA575X_BIT_MONO        (1<<22)         /* 0 = stereo, 1 = mono */
 54 #define TEA575X_BIT_BAND_MASK   (3<<20)
 55 #define TEA575X_BIT_BAND_FM     (0<<20)
 56 
 57 #define TB_LEN 6
 58 #define DRV_NAME "radioshark"
 59 
 60 #define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev)
 61 
 62 /* Note BLUE_IS_PULSE comes after NO_LEDS as it is a status bit, not a LED */
 63 enum { BLUE_LED, BLUE_PULSE_LED, RED_LED, NO_LEDS, BLUE_IS_PULSE };
 64 
 65 struct shark_device {
 66         struct usb_device *usbdev;
 67         struct v4l2_device v4l2_dev;
 68         struct snd_tea575x tea;
 69 
 70 #ifdef SHARK_USE_LEDS
 71         struct work_struct led_work;
 72         struct led_classdev leds[NO_LEDS];
 73         char led_names[NO_LEDS][32];
 74         atomic_t brightness[NO_LEDS];
 75         unsigned long brightness_new;
 76 #endif
 77 
 78         u8 *transfer_buffer;
 79         u32 last_val;
 80 };
 81 
 82 static atomic_t shark_instance = ATOMIC_INIT(0);
 83 
 84 static void shark_write_val(struct snd_tea575x *tea, u32 val)
 85 {
 86         struct shark_device *shark = tea->private_data;
 87         int i, res, actual_len;
 88 
 89         /* Avoid unnecessary (slow) USB transfers */
 90         if (shark->last_val == val)
 91                 return;
 92 
 93         memset(shark->transfer_buffer, 0, TB_LEN);
 94         shark->transfer_buffer[0] = 0xc0; /* Write shift register command */
 95         for (i = 0; i < 4; i++)
 96                 shark->transfer_buffer[i] |= (val >> (24 - i * 8)) & 0xff;
 97 
 98         res = usb_interrupt_msg(shark->usbdev,
 99                                 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
100                                 shark->transfer_buffer, TB_LEN,
101                                 &actual_len, 1000);
102         if (res >= 0)
103                 shark->last_val = val;
104         else
105                 v4l2_err(&shark->v4l2_dev, "set-freq error: %d\n", res);
106 }
107 
108 static u32 shark_read_val(struct snd_tea575x *tea)
109 {
110         struct shark_device *shark = tea->private_data;
111         int i, res, actual_len;
112         u32 val = 0;
113 
114         memset(shark->transfer_buffer, 0, TB_LEN);
115         shark->transfer_buffer[0] = 0x80;
116         res = usb_interrupt_msg(shark->usbdev,
117                                 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
118                                 shark->transfer_buffer, TB_LEN,
119                                 &actual_len, 1000);
120         if (res < 0) {
121                 v4l2_err(&shark->v4l2_dev, "request-status error: %d\n", res);
122                 return shark->last_val;
123         }
124 
125         res = usb_interrupt_msg(shark->usbdev,
126                                 usb_rcvintpipe(shark->usbdev, SHARK_IN_EP),
127                                 shark->transfer_buffer, TB_LEN,
128                                 &actual_len, 1000);
129         if (res < 0) {
130                 v4l2_err(&shark->v4l2_dev, "get-status error: %d\n", res);
131                 return shark->last_val;
132         }
133 
134         for (i = 0; i < 4; i++)
135                 val |= shark->transfer_buffer[i] << (24 - i * 8);
136 
137         shark->last_val = val;
138 
139         /*
140          * The shark does not allow actually reading the stereo / mono pin :(
141          * So assume that when we're tuned to an FM station and mono has not
142          * been requested, that we're receiving stereo.
143          */
144         if (((val & TEA575X_BIT_BAND_MASK) == TEA575X_BIT_BAND_FM) &&
145             !(val & TEA575X_BIT_MONO))
146                 shark->tea.stereo = true;
147         else
148                 shark->tea.stereo = false;
149 
150         return val;
151 }
152 
153 static struct snd_tea575x_ops shark_tea_ops = {
154         .write_val = shark_write_val,
155         .read_val  = shark_read_val,
156 };
157 
158 #ifdef SHARK_USE_LEDS
159 static void shark_led_work(struct work_struct *work)
160 {
161         struct shark_device *shark =
162                 container_of(work, struct shark_device, led_work);
163         int i, res, brightness, actual_len;
164 
165         for (i = 0; i < 3; i++) {
166                 if (!test_and_clear_bit(i, &shark->brightness_new))
167                         continue;
168 
169                 brightness = atomic_read(&shark->brightness[i]);
170                 memset(shark->transfer_buffer, 0, TB_LEN);
171                 if (i != RED_LED) {
172                         shark->transfer_buffer[0] = 0xA0 + i;
173                         shark->transfer_buffer[1] = brightness;
174                 } else
175                         shark->transfer_buffer[0] = brightness ? 0xA9 : 0xA8;
176                 res = usb_interrupt_msg(shark->usbdev,
177                                         usb_sndintpipe(shark->usbdev, 0x05),
178                                         shark->transfer_buffer, TB_LEN,
179                                         &actual_len, 1000);
180                 if (res < 0)
181                         v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
182                                  shark->led_names[i], res);
183         }
184 }
185 
186 static void shark_led_set_blue(struct led_classdev *led_cdev,
187                                enum led_brightness value)
188 {
189         struct shark_device *shark =
190                 container_of(led_cdev, struct shark_device, leds[BLUE_LED]);
191 
192         atomic_set(&shark->brightness[BLUE_LED], value);
193         set_bit(BLUE_LED, &shark->brightness_new);
194         clear_bit(BLUE_IS_PULSE, &shark->brightness_new);
195         schedule_work(&shark->led_work);
196 }
197 
198 static void shark_led_set_blue_pulse(struct led_classdev *led_cdev,
199                                      enum led_brightness value)
200 {
201         struct shark_device *shark = container_of(led_cdev,
202                                 struct shark_device, leds[BLUE_PULSE_LED]);
203 
204         atomic_set(&shark->brightness[BLUE_PULSE_LED], 256 - value);
205         set_bit(BLUE_PULSE_LED, &shark->brightness_new);
206         set_bit(BLUE_IS_PULSE, &shark->brightness_new);
207         schedule_work(&shark->led_work);
208 }
209 
210 static void shark_led_set_red(struct led_classdev *led_cdev,
211                               enum led_brightness value)
212 {
213         struct shark_device *shark =
214                 container_of(led_cdev, struct shark_device, leds[RED_LED]);
215 
216         atomic_set(&shark->brightness[RED_LED], value);
217         set_bit(RED_LED, &shark->brightness_new);
218         schedule_work(&shark->led_work);
219 }
220 
221 static const struct led_classdev shark_led_templates[NO_LEDS] = {
222         [BLUE_LED] = {
223                 .name           = "%s:blue:",
224                 .brightness     = LED_OFF,
225                 .max_brightness = 127,
226                 .brightness_set = shark_led_set_blue,
227         },
228         [BLUE_PULSE_LED] = {
229                 .name           = "%s:blue-pulse:",
230                 .brightness     = LED_OFF,
231                 .max_brightness = 255,
232                 .brightness_set = shark_led_set_blue_pulse,
233         },
234         [RED_LED] = {
235                 .name           = "%s:red:",
236                 .brightness     = LED_OFF,
237                 .max_brightness = 1,
238                 .brightness_set = shark_led_set_red,
239         },
240 };
241 
242 static int shark_register_leds(struct shark_device *shark, struct device *dev)
243 {
244         int i, retval;
245 
246         atomic_set(&shark->brightness[BLUE_LED], 127);
247         INIT_WORK(&shark->led_work, shark_led_work);
248         for (i = 0; i < NO_LEDS; i++) {
249                 shark->leds[i] = shark_led_templates[i];
250                 snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
251                          shark->leds[i].name, shark->v4l2_dev.name);
252                 shark->leds[i].name = shark->led_names[i];
253                 retval = led_classdev_register(dev, &shark->leds[i]);
254                 if (retval) {
255                         v4l2_err(&shark->v4l2_dev,
256                                  "couldn't register led: %s\n",
257                                  shark->led_names[i]);
258                         return retval;
259                 }
260         }
261         return 0;
262 }
263 
264 static void shark_unregister_leds(struct shark_device *shark)
265 {
266         int i;
267 
268         for (i = 0; i < NO_LEDS; i++)
269                 led_classdev_unregister(&shark->leds[i]);
270 
271         cancel_work_sync(&shark->led_work);
272 }
273 
274 static inline void shark_resume_leds(struct shark_device *shark)
275 {
276         if (test_bit(BLUE_IS_PULSE, &shark->brightness_new))
277                 set_bit(BLUE_PULSE_LED, &shark->brightness_new);
278         else
279                 set_bit(BLUE_LED, &shark->brightness_new);
280         set_bit(RED_LED, &shark->brightness_new);
281         schedule_work(&shark->led_work);
282 }
283 #else
284 static int shark_register_leds(struct shark_device *shark, struct device *dev)
285 {
286         v4l2_warn(&shark->v4l2_dev,
287                   "CONFIG_LEDS_CLASS not enabled, LED support disabled\n");
288         return 0;
289 }
290 static inline void shark_unregister_leds(struct shark_device *shark) { }
291 static inline void shark_resume_leds(struct shark_device *shark) { }
292 #endif
293 
294 static void usb_shark_disconnect(struct usb_interface *intf)
295 {
296         struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
297         struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
298 
299         mutex_lock(&shark->tea.mutex);
300         v4l2_device_disconnect(&shark->v4l2_dev);
301         snd_tea575x_exit(&shark->tea);
302         mutex_unlock(&shark->tea.mutex);
303 
304         shark_unregister_leds(shark);
305 
306         v4l2_device_put(&shark->v4l2_dev);
307 }
308 
309 static void usb_shark_release(struct v4l2_device *v4l2_dev)
310 {
311         struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
312 
313         v4l2_device_unregister(&shark->v4l2_dev);
314         kfree(shark->transfer_buffer);
315         kfree(shark);
316 }
317 
318 static int usb_shark_probe(struct usb_interface *intf,
319                            const struct usb_device_id *id)
320 {
321         struct shark_device *shark;
322         int retval = -ENOMEM;
323 
324         shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL);
325         if (!shark)
326                 return retval;
327 
328         shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
329         if (!shark->transfer_buffer)
330                 goto err_alloc_buffer;
331 
332         v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);
333 
334         retval = shark_register_leds(shark, &intf->dev);
335         if (retval)
336                 goto err_reg_leds;
337 
338         shark->v4l2_dev.release = usb_shark_release;
339         retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev);
340         if (retval) {
341                 v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n");
342                 goto err_reg_dev;
343         }
344 
345         shark->usbdev = interface_to_usbdev(intf);
346         shark->tea.v4l2_dev = &shark->v4l2_dev;
347         shark->tea.private_data = shark;
348         shark->tea.radio_nr = -1;
349         shark->tea.ops = &shark_tea_ops;
350         shark->tea.cannot_mute = true;
351         shark->tea.has_am = true;
352         strlcpy(shark->tea.card, "Griffin radioSHARK",
353                 sizeof(shark->tea.card));
354         usb_make_path(shark->usbdev, shark->tea.bus_info,
355                 sizeof(shark->tea.bus_info));
356 
357         retval = snd_tea575x_init(&shark->tea, THIS_MODULE);
358         if (retval) {
359                 v4l2_err(&shark->v4l2_dev, "couldn't init tea5757\n");
360                 goto err_init_tea;
361         }
362 
363         return 0;
364 
365 err_init_tea:
366         v4l2_device_unregister(&shark->v4l2_dev);
367 err_reg_dev:
368         shark_unregister_leds(shark);
369 err_reg_leds:
370         kfree(shark->transfer_buffer);
371 err_alloc_buffer:
372         kfree(shark);
373 
374         return retval;
375 }
376 
377 #ifdef CONFIG_PM
378 static int usb_shark_suspend(struct usb_interface *intf, pm_message_t message)
379 {
380         return 0;
381 }
382 
383 static int usb_shark_resume(struct usb_interface *intf)
384 {
385         struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
386         struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
387 
388         mutex_lock(&shark->tea.mutex);
389         snd_tea575x_set_freq(&shark->tea);
390         mutex_unlock(&shark->tea.mutex);
391 
392         shark_resume_leds(shark);
393 
394         return 0;
395 }
396 #endif
397 
398 /* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */
399 static struct usb_device_id usb_shark_device_table[] = {
400         { .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION |
401                          USB_DEVICE_ID_MATCH_INT_CLASS,
402           .idVendor     = 0x077d,
403           .idProduct    = 0x627a,
404           .bcdDevice_lo = 0x0001,
405           .bcdDevice_hi = 0x0001,
406           .bInterfaceClass = 3,
407         },
408         { }
409 };
410 MODULE_DEVICE_TABLE(usb, usb_shark_device_table);
411 
412 static struct usb_driver usb_shark_driver = {
413         .name                   = DRV_NAME,
414         .probe                  = usb_shark_probe,
415         .disconnect             = usb_shark_disconnect,
416         .id_table               = usb_shark_device_table,
417 #ifdef CONFIG_PM
418         .suspend                = usb_shark_suspend,
419         .resume                 = usb_shark_resume,
420         .reset_resume           = usb_shark_resume,
421 #endif
422 };
423 module_usb_driver(usb_shark_driver);
424 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us