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Hans de Goede8e2ce732012-05-21 15:24:50 -03001/*
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 <sound/tea575x-tuner.h>
37
Hans de Goede3e3b92c2012-08-11 06:34:54 -030038#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
Hans de Goede8e2ce732012-05-21 15:24:50 -030043/*
44 * Version Information
45 */
46MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
47MODULE_DESCRIPTION("Griffin radioSHARK, USB radio receiver driver");
48MODULE_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
62enum { BLUE_LED, BLUE_PULSE_LED, RED_LED, NO_LEDS };
63
Hans de Goede8e2ce732012-05-21 15:24:50 -030064struct shark_device {
65 struct usb_device *usbdev;
66 struct v4l2_device v4l2_dev;
67 struct snd_tea575x tea;
68
Hans de Goede3e3b92c2012-08-11 06:34:54 -030069#ifdef SHARK_USE_LEDS
Hans de Goede8e2ce732012-05-21 15:24:50 -030070 struct work_struct led_work;
71 struct led_classdev leds[NO_LEDS];
72 char led_names[NO_LEDS][32];
73 atomic_t brightness[NO_LEDS];
74 unsigned long brightness_new;
Hans de Goede3e3b92c2012-08-11 06:34:54 -030075#endif
Hans de Goede8e2ce732012-05-21 15:24:50 -030076
77 u8 *transfer_buffer;
78 u32 last_val;
79};
80
81static atomic_t shark_instance = ATOMIC_INIT(0);
82
83static void shark_write_val(struct snd_tea575x *tea, u32 val)
84{
85 struct shark_device *shark = tea->private_data;
86 int i, res, actual_len;
87
88 /* Avoid unnecessary (slow) USB transfers */
89 if (shark->last_val == val)
90 return;
91
92 memset(shark->transfer_buffer, 0, TB_LEN);
93 shark->transfer_buffer[0] = 0xc0; /* Write shift register command */
94 for (i = 0; i < 4; i++)
95 shark->transfer_buffer[i] |= (val >> (24 - i * 8)) & 0xff;
96
97 res = usb_interrupt_msg(shark->usbdev,
98 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
99 shark->transfer_buffer, TB_LEN,
100 &actual_len, 1000);
101 if (res >= 0)
102 shark->last_val = val;
103 else
104 v4l2_err(&shark->v4l2_dev, "set-freq error: %d\n", res);
105}
106
107static u32 shark_read_val(struct snd_tea575x *tea)
108{
109 struct shark_device *shark = tea->private_data;
110 int i, res, actual_len;
111 u32 val = 0;
112
113 memset(shark->transfer_buffer, 0, TB_LEN);
114 shark->transfer_buffer[0] = 0x80;
115 res = usb_interrupt_msg(shark->usbdev,
116 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
117 shark->transfer_buffer, TB_LEN,
118 &actual_len, 1000);
119 if (res < 0) {
120 v4l2_err(&shark->v4l2_dev, "request-status error: %d\n", res);
121 return shark->last_val;
122 }
123
124 res = usb_interrupt_msg(shark->usbdev,
125 usb_rcvintpipe(shark->usbdev, SHARK_IN_EP),
126 shark->transfer_buffer, TB_LEN,
127 &actual_len, 1000);
128 if (res < 0) {
129 v4l2_err(&shark->v4l2_dev, "get-status error: %d\n", res);
130 return shark->last_val;
131 }
132
133 for (i = 0; i < 4; i++)
134 val |= shark->transfer_buffer[i] << (24 - i * 8);
135
136 shark->last_val = val;
137
138 /*
139 * The shark does not allow actually reading the stereo / mono pin :(
140 * So assume that when we're tuned to an FM station and mono has not
141 * been requested, that we're receiving stereo.
142 */
143 if (((val & TEA575X_BIT_BAND_MASK) == TEA575X_BIT_BAND_FM) &&
144 !(val & TEA575X_BIT_MONO))
145 shark->tea.stereo = true;
146 else
147 shark->tea.stereo = false;
148
149 return val;
150}
151
152static struct snd_tea575x_ops shark_tea_ops = {
153 .write_val = shark_write_val,
154 .read_val = shark_read_val,
155};
156
Hans de Goede3e3b92c2012-08-11 06:34:54 -0300157#ifdef SHARK_USE_LEDS
Hans de Goede8e2ce732012-05-21 15:24:50 -0300158static void shark_led_work(struct work_struct *work)
159{
160 struct shark_device *shark =
161 container_of(work, struct shark_device, led_work);
162 int i, res, brightness, actual_len;
163
Hans de Goede8e2ce732012-05-21 15:24:50 -0300164 for (i = 0; i < 3; i++) {
165 if (!test_and_clear_bit(i, &shark->brightness_new))
166 continue;
167
168 brightness = atomic_read(&shark->brightness[i]);
169 memset(shark->transfer_buffer, 0, TB_LEN);
170 if (i != RED_LED) {
171 shark->transfer_buffer[0] = 0xA0 + i;
172 shark->transfer_buffer[1] = brightness;
173 } else
174 shark->transfer_buffer[0] = brightness ? 0xA9 : 0xA8;
175 res = usb_interrupt_msg(shark->usbdev,
176 usb_sndintpipe(shark->usbdev, 0x05),
177 shark->transfer_buffer, TB_LEN,
178 &actual_len, 1000);
179 if (res < 0)
180 v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
181 shark->led_names[i], res);
182 }
Hans de Goede8e2ce732012-05-21 15:24:50 -0300183}
184
185static void shark_led_set_blue(struct led_classdev *led_cdev,
186 enum led_brightness value)
187{
188 struct shark_device *shark =
189 container_of(led_cdev, struct shark_device, leds[BLUE_LED]);
190
191 atomic_set(&shark->brightness[BLUE_LED], value);
192 set_bit(BLUE_LED, &shark->brightness_new);
193 schedule_work(&shark->led_work);
194}
195
196static void shark_led_set_blue_pulse(struct led_classdev *led_cdev,
197 enum led_brightness value)
198{
199 struct shark_device *shark = container_of(led_cdev,
200 struct shark_device, leds[BLUE_PULSE_LED]);
201
202 atomic_set(&shark->brightness[BLUE_PULSE_LED], 256 - value);
203 set_bit(BLUE_PULSE_LED, &shark->brightness_new);
204 schedule_work(&shark->led_work);
205}
206
207static void shark_led_set_red(struct led_classdev *led_cdev,
208 enum led_brightness value)
209{
210 struct shark_device *shark =
211 container_of(led_cdev, struct shark_device, leds[RED_LED]);
212
213 atomic_set(&shark->brightness[RED_LED], value);
214 set_bit(RED_LED, &shark->brightness_new);
215 schedule_work(&shark->led_work);
216}
217
Hans de Goede3e3b92c2012-08-11 06:34:54 -0300218static const struct led_classdev shark_led_templates[NO_LEDS] = {
219 [BLUE_LED] = {
220 .name = "%s:blue:",
221 .brightness = LED_OFF,
222 .max_brightness = 127,
223 .brightness_set = shark_led_set_blue,
224 },
225 [BLUE_PULSE_LED] = {
226 .name = "%s:blue-pulse:",
227 .brightness = LED_OFF,
228 .max_brightness = 255,
229 .brightness_set = shark_led_set_blue_pulse,
230 },
231 [RED_LED] = {
232 .name = "%s:red:",
233 .brightness = LED_OFF,
234 .max_brightness = 1,
235 .brightness_set = shark_led_set_red,
236 },
237};
238
239static int shark_register_leds(struct shark_device *shark, struct device *dev)
240{
241 int i, retval;
242
243 INIT_WORK(&shark->led_work, shark_led_work);
244 for (i = 0; i < NO_LEDS; i++) {
245 shark->leds[i] = shark_led_templates[i];
246 snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
247 shark->leds[i].name, shark->v4l2_dev.name);
248 shark->leds[i].name = shark->led_names[i];
249 retval = led_classdev_register(dev, &shark->leds[i]);
250 if (retval) {
251 v4l2_err(&shark->v4l2_dev,
252 "couldn't register led: %s\n",
253 shark->led_names[i]);
254 return retval;
255 }
256 }
257 return 0;
258}
259
260static void shark_unregister_leds(struct shark_device *shark)
261{
262 int i;
263
264 for (i = 0; i < NO_LEDS; i++)
265 led_classdev_unregister(&shark->leds[i]);
266
267 cancel_work_sync(&shark->led_work);
268}
269#else
270static int shark_register_leds(struct shark_device *shark, struct device *dev)
271{
272 v4l2_warn(&shark->v4l2_dev,
273 "CONFIG_LED_CLASS not enabled, LED support disabled\n");
274 return 0;
275}
276static inline void shark_unregister_leds(struct shark_device *shark) { }
277#endif
278
Hans de Goede8e2ce732012-05-21 15:24:50 -0300279static void usb_shark_disconnect(struct usb_interface *intf)
280{
281 struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
282 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
Hans de Goede8e2ce732012-05-21 15:24:50 -0300283
284 mutex_lock(&shark->tea.mutex);
285 v4l2_device_disconnect(&shark->v4l2_dev);
286 snd_tea575x_exit(&shark->tea);
287 mutex_unlock(&shark->tea.mutex);
288
Hans de Goede3e3b92c2012-08-11 06:34:54 -0300289 shark_unregister_leds(shark);
Hans de Goedecfc1b2a2012-08-11 06:34:53 -0300290
Hans de Goede8e2ce732012-05-21 15:24:50 -0300291 v4l2_device_put(&shark->v4l2_dev);
292}
293
294static void usb_shark_release(struct v4l2_device *v4l2_dev)
295{
296 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
297
Hans de Goede8e2ce732012-05-21 15:24:50 -0300298 v4l2_device_unregister(&shark->v4l2_dev);
299 kfree(shark->transfer_buffer);
300 kfree(shark);
301}
302
303static int usb_shark_probe(struct usb_interface *intf,
304 const struct usb_device_id *id)
305{
306 struct shark_device *shark;
Hans de Goede3e3b92c2012-08-11 06:34:54 -0300307 int retval = -ENOMEM;
Hans de Goede8e2ce732012-05-21 15:24:50 -0300308
309 shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL);
310 if (!shark)
311 return retval;
312
313 shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
314 if (!shark->transfer_buffer)
315 goto err_alloc_buffer;
316
Hans de Goede8e2ce732012-05-21 15:24:50 -0300317 v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);
Hans de Goede3e3b92c2012-08-11 06:34:54 -0300318
319 retval = shark_register_leds(shark, &intf->dev);
320 if (retval)
321 goto err_reg_leds;
322
323 shark->v4l2_dev.release = usb_shark_release;
Hans de Goede8e2ce732012-05-21 15:24:50 -0300324 retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev);
325 if (retval) {
326 v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n");
327 goto err_reg_dev;
328 }
329
330 shark->usbdev = interface_to_usbdev(intf);
331 shark->tea.v4l2_dev = &shark->v4l2_dev;
332 shark->tea.private_data = shark;
333 shark->tea.radio_nr = -1;
334 shark->tea.ops = &shark_tea_ops;
335 shark->tea.cannot_mute = true;
336 strlcpy(shark->tea.card, "Griffin radioSHARK",
337 sizeof(shark->tea.card));
338 usb_make_path(shark->usbdev, shark->tea.bus_info,
339 sizeof(shark->tea.bus_info));
340
341 retval = snd_tea575x_init(&shark->tea, THIS_MODULE);
342 if (retval) {
343 v4l2_err(&shark->v4l2_dev, "couldn't init tea5757\n");
344 goto err_init_tea;
345 }
346
Hans de Goede8e2ce732012-05-21 15:24:50 -0300347 return 0;
348
349err_init_tea:
350 v4l2_device_unregister(&shark->v4l2_dev);
351err_reg_dev:
Hans de Goede3e3b92c2012-08-11 06:34:54 -0300352 shark_unregister_leds(shark);
353err_reg_leds:
Hans de Goede8e2ce732012-05-21 15:24:50 -0300354 kfree(shark->transfer_buffer);
355err_alloc_buffer:
356 kfree(shark);
357
358 return retval;
359}
360
361/* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */
362static struct usb_device_id usb_shark_device_table[] = {
363 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION |
364 USB_DEVICE_ID_MATCH_INT_CLASS,
365 .idVendor = 0x077d,
366 .idProduct = 0x627a,
367 .bcdDevice_lo = 0x0001,
368 .bcdDevice_hi = 0x0001,
369 .bInterfaceClass = 3,
370 },
371 { }
372};
373MODULE_DEVICE_TABLE(usb, usb_shark_device_table);
374
375static struct usb_driver usb_shark_driver = {
376 .name = DRV_NAME,
377 .probe = usb_shark_probe,
378 .disconnect = usb_shark_disconnect,
379 .id_table = usb_shark_device_table,
380};
381module_usb_driver(usb_shark_driver);