--- /dev/null
+/*
+ * Linux V4L2 radio driver for the Griffin radioSHARK USB radio receiver
+ *
+ * Note the radioSHARK offers the audio through a regular USB audio device,
+ * this driver only handles the tuning.
+ *
+ * The info necessary to drive the shark was taken from the small userspace
+ * shark.c program by Michael Rolig, which he kindly placed in the Public
+ * Domain.
+ *
+ * Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/workqueue.h>
+#include <media/v4l2-device.h>
+#include <sound/tea575x-tuner.h>
+
+/*
+ * Version Information
+ */
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("Griffin radioSHARK, USB radio receiver driver");
+MODULE_LICENSE("GPL");
+
+#define SHARK_IN_EP 0x83
+#define SHARK_OUT_EP 0x05
+
+#define TEA575X_BIT_MONO (1<<22) /* 0 = stereo, 1 = mono */
+#define TEA575X_BIT_BAND_MASK (3<<20)
+#define TEA575X_BIT_BAND_FM (0<<20)
+
+#define TB_LEN 6
+#define DRV_NAME "radioshark"
+
+#define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev)
+
+enum { BLUE_LED, BLUE_PULSE_LED, RED_LED, NO_LEDS };
+
+static void shark_led_set_blue(struct led_classdev *led_cdev,
+ enum led_brightness value);
+static void shark_led_set_blue_pulse(struct led_classdev *led_cdev,
+ enum led_brightness value);
+static void shark_led_set_red(struct led_classdev *led_cdev,
+ enum led_brightness value);
+
+static const struct led_classdev shark_led_templates[NO_LEDS] = {
+ [BLUE_LED] = {
+ .name = "%s:blue:",
+ .brightness = LED_OFF,
+ .max_brightness = 127,
+ .brightness_set = shark_led_set_blue,
+ },
+ [BLUE_PULSE_LED] = {
+ .name = "%s:blue-pulse:",
+ .brightness = LED_OFF,
+ .max_brightness = 255,
+ .brightness_set = shark_led_set_blue_pulse,
+ },
+ [RED_LED] = {
+ .name = "%s:red:",
+ .brightness = LED_OFF,
+ .max_brightness = 1,
+ .brightness_set = shark_led_set_red,
+ },
+};
+
+struct shark_device {
+ struct usb_device *usbdev;
+ struct v4l2_device v4l2_dev;
+ struct snd_tea575x tea;
+
+ struct work_struct led_work;
+ struct led_classdev leds[NO_LEDS];
+ char led_names[NO_LEDS][32];
+ atomic_t brightness[NO_LEDS];
+ unsigned long brightness_new;
+
+ u8 *transfer_buffer;
+ u32 last_val;
+};
+
+static atomic_t shark_instance = ATOMIC_INIT(0);
+
+static void shark_write_val(struct snd_tea575x *tea, u32 val)
+{
+ struct shark_device *shark = tea->private_data;
+ int i, res, actual_len;
+
+ /* Avoid unnecessary (slow) USB transfers */
+ if (shark->last_val == val)
+ return;
+
+ memset(shark->transfer_buffer, 0, TB_LEN);
+ shark->transfer_buffer[0] = 0xc0; /* Write shift register command */
+ for (i = 0; i < 4; i++)
+ shark->transfer_buffer[i] |= (val >> (24 - i * 8)) & 0xff;
+
+ res = usb_interrupt_msg(shark->usbdev,
+ usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
+ shark->transfer_buffer, TB_LEN,
+ &actual_len, 1000);
+ if (res >= 0)
+ shark->last_val = val;
+ else
+ v4l2_err(&shark->v4l2_dev, "set-freq error: %d\n", res);
+}
+
+static u32 shark_read_val(struct snd_tea575x *tea)
+{
+ struct shark_device *shark = tea->private_data;
+ int i, res, actual_len;
+ u32 val = 0;
+
+ memset(shark->transfer_buffer, 0, TB_LEN);
+ shark->transfer_buffer[0] = 0x80;
+ res = usb_interrupt_msg(shark->usbdev,
+ usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
+ shark->transfer_buffer, TB_LEN,
+ &actual_len, 1000);
+ if (res < 0) {
+ v4l2_err(&shark->v4l2_dev, "request-status error: %d\n", res);
+ return shark->last_val;
+ }
+
+ res = usb_interrupt_msg(shark->usbdev,
+ usb_rcvintpipe(shark->usbdev, SHARK_IN_EP),
+ shark->transfer_buffer, TB_LEN,
+ &actual_len, 1000);
+ if (res < 0) {
+ v4l2_err(&shark->v4l2_dev, "get-status error: %d\n", res);
+ return shark->last_val;
+ }
+
+ for (i = 0; i < 4; i++)
+ val |= shark->transfer_buffer[i] << (24 - i * 8);
+
+ shark->last_val = val;
+
+ /*
+ * The shark does not allow actually reading the stereo / mono pin :(
+ * So assume that when we're tuned to an FM station and mono has not
+ * been requested, that we're receiving stereo.
+ */
+ if (((val & TEA575X_BIT_BAND_MASK) == TEA575X_BIT_BAND_FM) &&
+ !(val & TEA575X_BIT_MONO))
+ shark->tea.stereo = true;
+ else
+ shark->tea.stereo = false;
+
+ return val;
+}
+
+static struct snd_tea575x_ops shark_tea_ops = {
+ .write_val = shark_write_val,
+ .read_val = shark_read_val,
+};
+
+static void shark_led_work(struct work_struct *work)
+{
+ struct shark_device *shark =
+ container_of(work, struct shark_device, led_work);
+ int i, res, brightness, actual_len;
+
+ /*
+ * We use the v4l2_dev lock and registered bit to ensure the device
+ * does not get unplugged and unreffed while we're running.
+ */
+ mutex_lock(&shark->tea.mutex);
+ if (!video_is_registered(&shark->tea.vd))
+ goto leave;
+
+ for (i = 0; i < 3; i++) {
+ if (!test_and_clear_bit(i, &shark->brightness_new))
+ continue;
+
+ brightness = atomic_read(&shark->brightness[i]);
+ memset(shark->transfer_buffer, 0, TB_LEN);
+ if (i != RED_LED) {
+ shark->transfer_buffer[0] = 0xA0 + i;
+ shark->transfer_buffer[1] = brightness;
+ } else
+ shark->transfer_buffer[0] = brightness ? 0xA9 : 0xA8;
+ res = usb_interrupt_msg(shark->usbdev,
+ usb_sndintpipe(shark->usbdev, 0x05),
+ shark->transfer_buffer, TB_LEN,
+ &actual_len, 1000);
+ if (res < 0)
+ v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
+ shark->led_names[i], res);
+ }
+leave:
+ mutex_unlock(&shark->tea.mutex);
+}
+
+static void shark_led_set_blue(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct shark_device *shark =
+ container_of(led_cdev, struct shark_device, leds[BLUE_LED]);
+
+ atomic_set(&shark->brightness[BLUE_LED], value);
+ set_bit(BLUE_LED, &shark->brightness_new);
+ schedule_work(&shark->led_work);
+}
+
+static void shark_led_set_blue_pulse(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct shark_device *shark = container_of(led_cdev,
+ struct shark_device, leds[BLUE_PULSE_LED]);
+
+ atomic_set(&shark->brightness[BLUE_PULSE_LED], 256 - value);
+ set_bit(BLUE_PULSE_LED, &shark->brightness_new);
+ schedule_work(&shark->led_work);
+}
+
+static void shark_led_set_red(struct led_classdev *led_cdev,
+ enum led_brightness value)
+{
+ struct shark_device *shark =
+ container_of(led_cdev, struct shark_device, leds[RED_LED]);
+
+ atomic_set(&shark->brightness[RED_LED], value);
+ set_bit(RED_LED, &shark->brightness_new);
+ schedule_work(&shark->led_work);
+}
+
+static void usb_shark_disconnect(struct usb_interface *intf)
+{
+ struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
+ struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
+ int i;
+
+ mutex_lock(&shark->tea.mutex);
+ v4l2_device_disconnect(&shark->v4l2_dev);
+ snd_tea575x_exit(&shark->tea);
+ mutex_unlock(&shark->tea.mutex);
+
+ for (i = 0; i < NO_LEDS; i++)
+ led_classdev_unregister(&shark->leds[i]);
+
+ v4l2_device_put(&shark->v4l2_dev);
+}
+
+static void usb_shark_release(struct v4l2_device *v4l2_dev)
+{
+ struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
+
+ cancel_work_sync(&shark->led_work);
+ v4l2_device_unregister(&shark->v4l2_dev);
+ kfree(shark->transfer_buffer);
+ kfree(shark);
+}
+
+static int usb_shark_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct shark_device *shark;
+ int i, retval = -ENOMEM;
+
+ shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL);
+ if (!shark)
+ return retval;
+
+ shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
+ if (!shark->transfer_buffer)
+ goto err_alloc_buffer;
+
+ /*
+ * Work around a bug in usbhid/hid-core.c, where it leaves a dangling
+ * pointer in intfdata causing v4l2-device.c to not set it. Which
+ * results in usb_shark_disconnect() referencing the dangling pointer
+ *
+ * REMOVE (as soon as the above bug is fixed, patch submitted)
+ */
+ usb_set_intfdata(intf, NULL);
+
+ shark->v4l2_dev.release = usb_shark_release;
+ v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);
+ retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev);
+ if (retval) {
+ v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n");
+ goto err_reg_dev;
+ }
+
+ shark->usbdev = interface_to_usbdev(intf);
+ shark->tea.v4l2_dev = &shark->v4l2_dev;
+ shark->tea.private_data = shark;
+ shark->tea.radio_nr = -1;
+ shark->tea.ops = &shark_tea_ops;
+ shark->tea.cannot_mute = true;
+ strlcpy(shark->tea.card, "Griffin radioSHARK",
+ sizeof(shark->tea.card));
+ usb_make_path(shark->usbdev, shark->tea.bus_info,
+ sizeof(shark->tea.bus_info));
+
+ retval = snd_tea575x_init(&shark->tea, THIS_MODULE);
+ if (retval) {
+ v4l2_err(&shark->v4l2_dev, "couldn't init tea5757\n");
+ goto err_init_tea;
+ }
+
+ INIT_WORK(&shark->led_work, shark_led_work);
+ for (i = 0; i < NO_LEDS; i++) {
+ shark->leds[i] = shark_led_templates[i];
+ snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
+ shark->leds[i].name, shark->v4l2_dev.name);
+ shark->leds[i].name = shark->led_names[i];
+ /*
+ * We don't fail the probe if we fail to register the leds,
+ * because once we've called snd_tea575x_init, the /dev/radio0
+ * node may be opened from userspace holding a reference to us!
+ *
+ * Note we cannot register the leds first instead as
+ * shark_led_work depends on the v4l2 mutex and registered bit.
+ */
+ retval = led_classdev_register(&intf->dev, &shark->leds[i]);
+ if (retval)
+ v4l2_err(&shark->v4l2_dev,
+ "couldn't register led: %s\n",
+ shark->led_names[i]);
+ }
+
+ return 0;
+
+err_init_tea:
+ v4l2_device_unregister(&shark->v4l2_dev);
+err_reg_dev:
+ kfree(shark->transfer_buffer);
+err_alloc_buffer:
+ kfree(shark);
+
+ return retval;
+}
+
+/* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */
+static struct usb_device_id usb_shark_device_table[] = {
+ { .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION |
+ USB_DEVICE_ID_MATCH_INT_CLASS,
+ .idVendor = 0x077d,
+ .idProduct = 0x627a,
+ .bcdDevice_lo = 0x0001,
+ .bcdDevice_hi = 0x0001,
+ .bInterfaceClass = 3,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(usb, usb_shark_device_table);
+
+static struct usb_driver usb_shark_driver = {
+ .name = DRV_NAME,
+ .probe = usb_shark_probe,
+ .disconnect = usb_shark_disconnect,
+ .id_table = usb_shark_device_table,
+};
+module_usb_driver(usb_shark_driver);
projects / kernel / kernel-generic.git / commitdiff