[media] radio-shark: New driver for the Griffin radioSHARK USB radio receiver

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 393 insertions, 0 deletions

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig
index 24ce5a47f955..e3c117122351 100644
--- a/drivers/media/radio/Kconfig
+++ b/drivers/media/radio/Kconfig
@@ -57,6 +57,22 @@ config RADIO_MAXIRADIO
           To compile this driver as a module, choose M here: the
           module will be called radio-maxiradio.
 
+config RADIO_SHARK
+        tristate "Griffin radioSHARK USB radio receiver"
+        depends on USB && SND
+        ---help---
+          Choose Y here if you have this radio receiver.
+
+          There are 2 versions of this device, this driver is for version 1,
+          which is white.
+
+          In order to control your radio card, you will need to use programs
+          that are compatible with the Video For Linux API.  Information on
+          this API and pointers to "v4l" programs may be found at
+          <file:Documentation/video4linux/API.html>.
+
+          To compile this driver as a module, choose M here: the
+          module will be called radio-shark.
 
 config I2C_SI4713
         tristate "I2C driver for Silicon Labs Si4713 device"
diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile
index ca8c7d134b95..e03b258e18d4 100644
--- a/drivers/media/radio/Makefile
+++ b/drivers/media/radio/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_RADIO_CADET) += radio-cadet.o
 obj-$(CONFIG_RADIO_TYPHOON) += radio-typhoon.o
 obj-$(CONFIG_RADIO_TERRATEC) += radio-terratec.o
 obj-$(CONFIG_RADIO_MAXIRADIO) += radio-maxiradio.o
+obj-$(CONFIG_RADIO_SHARK) += radio-shark.o
 obj-$(CONFIG_RADIO_RTRACK) += radio-aimslab.o
 obj-$(CONFIG_RADIO_ZOLTRIX) += radio-zoltrix.o
 obj-$(CONFIG_RADIO_GEMTEK) += radio-gemtek.o
diff --git a/drivers/media/radio/radio-shark.c b/drivers/media/radio/radio-shark.c
new file mode 100644
index 000000000000..d0b6bb507634
--- /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);