diff options
Diffstat (limited to 'drivers/media/radio/radio-shark.c')
| -rw-r--r-- | drivers/media/radio/radio-shark.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-shark.c b/drivers/media/radio/radio-shark.c new file mode 100644 index 00000000000..d0b6bb50763 --- /dev/null +++ b/drivers/media/radio/radio-shark.c @@ -0,0 +1,376 @@ +/* + * 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); |