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 * 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 "radio-tea5777.h" 37 38 #if defined(CONFIG_LEDS_CLASS) || \ 39 (defined(CONFIG_LEDS_CLASS_MODULE) && defined(CONFIG_RADIO_SHARK2_MODULE)) 40 #define SHARK_USE_LEDS 1 41 #endif 42 43 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); 44 MODULE_DESCRIPTION("Griffin radioSHARK2, USB radio receiver driver"); 45 MODULE_LICENSE("GPL"); 46 47 static int debug; 48 module_param(debug, int, 0); 49 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 50 51 #define SHARK_IN_EP 0x83 52 #define SHARK_OUT_EP 0x05 53 54 #define TB_LEN 7 55 #define DRV_NAME "radioshark2" 56 57 #define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev) 58 59 enum { BLUE_LED, RED_LED, NO_LEDS }; 60 61 struct shark_device { 62 struct usb_device *usbdev; 63 struct v4l2_device v4l2_dev; 64 struct radio_tea5777 tea; 65 66 #ifdef SHARK_USE_LEDS 67 struct work_struct led_work; 68 struct led_classdev leds[NO_LEDS]; 69 char led_names[NO_LEDS][32]; 70 atomic_t brightness[NO_LEDS]; 71 unsigned long brightness_new; 72 #endif 73 74 u8 *transfer_buffer; 75 }; 76 77 static atomic_t shark_instance = ATOMIC_INIT(0); 78 79 static int shark_write_reg(struct radio_tea5777 *tea, u64 reg) 80 { 81 struct shark_device *shark = tea->private_data; 82 int i, res, actual_len; 83 84 memset(shark->transfer_buffer, 0, TB_LEN); 85 shark->transfer_buffer[0] = 0x81; /* Write register command */ 86 for (i = 0; i < 6; i++) 87 shark->transfer_buffer[i + 1] = (reg >> (40 - i * 8)) & 0xff; 88 89 v4l2_dbg(1, debug, tea->v4l2_dev, "shark2-write: %*ph\n", 90 7, shark->transfer_buffer); 91 92 res = usb_interrupt_msg(shark->usbdev, 93 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP), 94 shark->transfer_buffer, TB_LEN, 95 &actual_len, 1000); 96 if (res < 0) { 97 v4l2_err(tea->v4l2_dev, "write error: %d\n", res); 98 return res; 99 } 100 101 return 0; 102 } 103 104 static int shark_read_reg(struct radio_tea5777 *tea, u32 *reg_ret) 105 { 106 struct shark_device *shark = tea->private_data; 107 int i, res, actual_len; 108 u32 reg = 0; 109 110 memset(shark->transfer_buffer, 0, TB_LEN); 111 shark->transfer_buffer[0] = 0x82; 112 res = usb_interrupt_msg(shark->usbdev, 113 usb_sndintpipe(shark->usbdev, SHARK_OUT_EP), 114 shark->transfer_buffer, TB_LEN, 115 &actual_len, 1000); 116 if (res < 0) { 117 v4l2_err(tea->v4l2_dev, "request-read error: %d\n", res); 118 return res; 119 } 120 121 res = usb_interrupt_msg(shark->usbdev, 122 usb_rcvintpipe(shark->usbdev, SHARK_IN_EP), 123 shark->transfer_buffer, TB_LEN, 124 &actual_len, 1000); 125 if (res < 0) { 126 v4l2_err(tea->v4l2_dev, "read error: %d\n", res); 127 return res; 128 } 129 130 for (i = 0; i < 3; i++) 131 reg |= shark->transfer_buffer[i] << (16 - i * 8); 132 133 v4l2_dbg(1, debug, tea->v4l2_dev, "shark2-read: %*ph\n", 134 3, shark->transfer_buffer); 135 136 *reg_ret = reg; 137 return 0; 138 } 139 140 static struct radio_tea5777_ops shark_tea_ops = { 141 .write_reg = shark_write_reg, 142 .read_reg = shark_read_reg, 143 }; 144 145 #ifdef SHARK_USE_LEDS 146 static void shark_led_work(struct work_struct *work) 147 { 148 struct shark_device *shark = 149 container_of(work, struct shark_device, led_work); 150 int i, res, brightness, actual_len; 151 152 for (i = 0; i < 2; i++) { 153 if (!test_and_clear_bit(i, &shark->brightness_new)) 154 continue; 155 156 brightness = atomic_read(&shark->brightness[i]); 157 memset(shark->transfer_buffer, 0, TB_LEN); 158 shark->transfer_buffer[0] = 0x83 + i; 159 shark->transfer_buffer[1] = brightness; 160 res = usb_interrupt_msg(shark->usbdev, 161 usb_sndintpipe(shark->usbdev, 162 SHARK_OUT_EP), 163 shark->transfer_buffer, TB_LEN, 164 &actual_len, 1000); 165 if (res < 0) 166 v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n", 167 shark->led_names[i], res); 168 } 169 } 170 171 static void shark_led_set_blue(struct led_classdev *led_cdev, 172 enum led_brightness value) 173 { 174 struct shark_device *shark = 175 container_of(led_cdev, struct shark_device, leds[BLUE_LED]); 176 177 atomic_set(&shark->brightness[BLUE_LED], value); 178 set_bit(BLUE_LED, &shark->brightness_new); 179 schedule_work(&shark->led_work); 180 } 181 182 static void shark_led_set_red(struct led_classdev *led_cdev, 183 enum led_brightness value) 184 { 185 struct shark_device *shark = 186 container_of(led_cdev, struct shark_device, leds[RED_LED]); 187 188 atomic_set(&shark->brightness[RED_LED], value); 189 set_bit(RED_LED, &shark->brightness_new); 190 schedule_work(&shark->led_work); 191 } 192 193 static const struct led_classdev shark_led_templates[NO_LEDS] = { 194 [BLUE_LED] = { 195 .name = "%s:blue:", 196 .brightness = LED_OFF, 197 .max_brightness = 127, 198 .brightness_set = shark_led_set_blue, 199 }, 200 [RED_LED] = { 201 .name = "%s:red:", 202 .brightness = LED_OFF, 203 .max_brightness = 1, 204 .brightness_set = shark_led_set_red, 205 }, 206 }; 207 208 static int shark_register_leds(struct shark_device *shark, struct device *dev) 209 { 210 int i, retval; 211 212 atomic_set(&shark->brightness[BLUE_LED], 127); 213 INIT_WORK(&shark->led_work, shark_led_work); 214 for (i = 0; i < NO_LEDS; i++) { 215 shark->leds[i] = shark_led_templates[i]; 216 snprintf(shark->led_names[i], sizeof(shark->led_names[0]), 217 shark->leds[i].name, shark->v4l2_dev.name); 218 shark->leds[i].name = shark->led_names[i]; 219 retval = led_classdev_register(dev, &shark->leds[i]); 220 if (retval) { 221 v4l2_err(&shark->v4l2_dev, 222 "couldn't register led: %s\n", 223 shark->led_names[i]); 224 return retval; 225 } 226 } 227 return 0; 228 } 229 230 static void shark_unregister_leds(struct shark_device *shark) 231 { 232 int i; 233 234 for (i = 0; i < NO_LEDS; i++) 235 led_classdev_unregister(&shark->leds[i]); 236 237 cancel_work_sync(&shark->led_work); 238 } 239 240 static void shark_resume_leds(struct shark_device *shark) 241 { 242 int i; 243 244 for (i = 0; i < NO_LEDS; i++) 245 set_bit(i, &shark->brightness_new); 246 247 schedule_work(&shark->led_work); 248 } 249 #else 250 static int shark_register_leds(struct shark_device *shark, struct device *dev) 251 { 252 v4l2_warn(&shark->v4l2_dev, 253 "CONFIG_LEDS_CLASS not enabled, LED support disabled\n"); 254 return 0; 255 } 256 static inline void shark_unregister_leds(struct shark_device *shark) { } 257 static inline void shark_resume_leds(struct shark_device *shark) { } 258 #endif 259 260 static void usb_shark_disconnect(struct usb_interface *intf) 261 { 262 struct v4l2_device *v4l2_dev = usb_get_intfdata(intf); 263 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev); 264 265 mutex_lock(&shark->tea.mutex); 266 v4l2_device_disconnect(&shark->v4l2_dev); 267 radio_tea5777_exit(&shark->tea); 268 mutex_unlock(&shark->tea.mutex); 269 270 shark_unregister_leds(shark); 271 272 v4l2_device_put(&shark->v4l2_dev); 273 } 274 275 static void usb_shark_release(struct v4l2_device *v4l2_dev) 276 { 277 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev); 278 279 v4l2_device_unregister(&shark->v4l2_dev); 280 kfree(shark->transfer_buffer); 281 kfree(shark); 282 } 283 284 static int usb_shark_probe(struct usb_interface *intf, 285 const struct usb_device_id *id) 286 { 287 struct shark_device *shark; 288 int retval = -ENOMEM; 289 290 shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL); 291 if (!shark) 292 return retval; 293 294 shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL); 295 if (!shark->transfer_buffer) 296 goto err_alloc_buffer; 297 298 v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance); 299 300 retval = shark_register_leds(shark, &intf->dev); 301 if (retval) 302 goto err_reg_leds; 303 304 shark->v4l2_dev.release = usb_shark_release; 305 retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev); 306 if (retval) { 307 v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n"); 308 goto err_reg_dev; 309 } 310 311 shark->usbdev = interface_to_usbdev(intf); 312 shark->tea.v4l2_dev = &shark->v4l2_dev; 313 shark->tea.private_data = shark; 314 shark->tea.ops = &shark_tea_ops; 315 shark->tea.has_am = true; 316 shark->tea.write_before_read = true; 317 strlcpy(shark->tea.card, "Griffin radioSHARK2", 318 sizeof(shark->tea.card)); 319 usb_make_path(shark->usbdev, shark->tea.bus_info, 320 sizeof(shark->tea.bus_info)); 321 322 retval = radio_tea5777_init(&shark->tea, THIS_MODULE); 323 if (retval) { 324 v4l2_err(&shark->v4l2_dev, "couldn't init tea5777\n"); 325 goto err_init_tea; 326 } 327 328 return 0; 329 330 err_init_tea: 331 v4l2_device_unregister(&shark->v4l2_dev); 332 err_reg_dev: 333 shark_unregister_leds(shark); 334 err_reg_leds: 335 kfree(shark->transfer_buffer); 336 err_alloc_buffer: 337 kfree(shark); 338 339 return retval; 340 } 341 342 #ifdef CONFIG_PM 343 static int usb_shark_suspend(struct usb_interface *intf, pm_message_t message) 344 { 345 return 0; 346 } 347 348 static int usb_shark_resume(struct usb_interface *intf) 349 { 350 struct v4l2_device *v4l2_dev = usb_get_intfdata(intf); 351 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev); 352 int ret; 353 354 mutex_lock(&shark->tea.mutex); 355 ret = radio_tea5777_set_freq(&shark->tea); 356 mutex_unlock(&shark->tea.mutex); 357 358 shark_resume_leds(shark); 359 360 return ret; 361 } 362 #endif 363 364 /* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */ 365 static struct usb_device_id usb_shark_device_table[] = { 366 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION | 367 USB_DEVICE_ID_MATCH_INT_CLASS, 368 .idVendor = 0x077d, 369 .idProduct = 0x627a, 370 .bcdDevice_lo = 0x0010, 371 .bcdDevice_hi = 0x0010, 372 .bInterfaceClass = 3, 373 }, 374 { } 375 }; 376 MODULE_DEVICE_TABLE(usb, usb_shark_device_table); 377 378 static struct usb_driver usb_shark_driver = { 379 .name = DRV_NAME, 380 .probe = usb_shark_probe, 381 .disconnect = usb_shark_disconnect, 382 .id_table = usb_shark_device_table, 383 #ifdef CONFIG_PM 384 .suspend = usb_shark_suspend, 385 .resume = usb_shark_resume, 386 .reset_resume = usb_shark_resume, 387 #endif 388 }; 389 module_usb_driver(usb_shark_driver); 390