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1/*2 * Linux V4L2 radio driver for the Griffin radioSHARK2 USB radio receiver3 *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 userspace8 * shark2.c program by Hisaaki Shibata, which he kindly placed in the Public9 * 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 modify14 * it under the terms of the GNU General Public License as published by15 * the Free Software Foundation; either version 2 of the License, or16 * (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 of20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the21 * 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 137#endif38 39MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");40MODULE_DESCRIPTION("Griffin radioSHARK2, USB radio receiver driver");41MODULE_LICENSE("GPL");42 43static int debug;44module_param(debug, int, 0);45MODULE_PARM_DESC(debug, "Debug level (0-1)");46 47#define SHARK_IN_EP 0x8348#define SHARK_OUT_EP 0x0549 50#define TB_LEN 751#define DRV_NAME "radioshark2"52 53#define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev)54 55enum { BLUE_LED, RED_LED, NO_LEDS };56 57struct shark_device {58 struct usb_device *usbdev;59 struct v4l2_device v4l2_dev;60 struct radio_tea5777 tea;61 62#ifdef SHARK_USE_LEDS63 struct work_struct led_work;64 struct led_classdev leds[NO_LEDS];65 char led_names[NO_LEDS][64];66 atomic_t brightness[NO_LEDS];67 unsigned long brightness_new;68#endif69 70 u8 *transfer_buffer;71};72 73static atomic_t shark_instance = ATOMIC_INIT(0);74 75static 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 100static 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 136static 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_LEDS142static 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 167static 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 178static 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 189static 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 204static 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 226static 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 236static 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#else246static 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}252static inline void shark_unregister_leds(struct shark_device *shark) { }253static inline void shark_resume_leds(struct shark_device *shark) { }254#endif255 256static 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 271static 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 280static 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 static const u8 ep_addresses[] = {286 SHARK_IN_EP | USB_DIR_IN,287 SHARK_OUT_EP | USB_DIR_OUT,288 0};289 290 /* Are the expected endpoints present? */291 if (!usb_check_int_endpoints(intf, ep_addresses)) {292 dev_err(&intf->dev, "Invalid radioSHARK2 device\n");293 return -EINVAL;294 }295 296 shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL);297 if (!shark)298 return retval;299 300 shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);301 if (!shark->transfer_buffer)302 goto err_alloc_buffer;303 304 v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);305 306 retval = shark_register_leds(shark, &intf->dev);307 if (retval)308 goto err_reg_leds;309 310 shark->v4l2_dev.release = usb_shark_release;311 retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev);312 if (retval) {313 v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n");314 goto err_reg_dev;315 }316 317 shark->usbdev = interface_to_usbdev(intf);318 shark->tea.v4l2_dev = &shark->v4l2_dev;319 shark->tea.private_data = shark;320 shark->tea.ops = &shark_tea_ops;321 shark->tea.has_am = true;322 shark->tea.write_before_read = true;323 strscpy(shark->tea.card, "Griffin radioSHARK2",324 sizeof(shark->tea.card));325 usb_make_path(shark->usbdev, shark->tea.bus_info,326 sizeof(shark->tea.bus_info));327 328 retval = radio_tea5777_init(&shark->tea, THIS_MODULE);329 if (retval) {330 v4l2_err(&shark->v4l2_dev, "couldn't init tea5777\n");331 goto err_init_tea;332 }333 334 return 0;335 336err_init_tea:337 v4l2_device_unregister(&shark->v4l2_dev);338err_reg_dev:339 shark_unregister_leds(shark);340err_reg_leds:341 kfree(shark->transfer_buffer);342err_alloc_buffer:343 kfree(shark);344 345 return retval;346}347 348#ifdef CONFIG_PM349static int usb_shark_suspend(struct usb_interface *intf, pm_message_t message)350{351 return 0;352}353 354static int usb_shark_resume(struct usb_interface *intf)355{356 struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);357 struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);358 int ret;359 360 mutex_lock(&shark->tea.mutex);361 ret = radio_tea5777_set_freq(&shark->tea);362 mutex_unlock(&shark->tea.mutex);363 364 shark_resume_leds(shark);365 366 return ret;367}368#endif369 370/* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */371static const struct usb_device_id usb_shark_device_table[] = {372 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION |373 USB_DEVICE_ID_MATCH_INT_CLASS,374 .idVendor = 0x077d,375 .idProduct = 0x627a,376 .bcdDevice_lo = 0x0010,377 .bcdDevice_hi = 0x0010,378 .bInterfaceClass = 3,379 },380 { }381};382MODULE_DEVICE_TABLE(usb, usb_shark_device_table);383 384static struct usb_driver usb_shark_driver = {385 .name = DRV_NAME,386 .probe = usb_shark_probe,387 .disconnect = usb_shark_disconnect,388 .id_table = usb_shark_device_table,389#ifdef CONFIG_PM390 .suspend = usb_shark_suspend,391 .resume = usb_shark_resume,392 .reset_resume = usb_shark_resume,393#endif394};395module_usb_driver(usb_shark_driver);396