1 files changed, 348 insertions, 0 deletions

diff --git a/drivers/media/radio/radio-shark2.c b/drivers/media/radio/radio-shark2.c
new file mode 100644
index 000000000000..b9575de3e7e8
--- /dev/null
+++ b/drivers/media/radio/radio-shark2.c
@@ -0,0 +1,348 @@
+/*
+ * Linux V4L2 radio driver for the Griffin radioSHARK2 USB radio receiver
+ *
+ * Note the radioSHARK2 offers the audio through a regular USB audio device,
+ * this driver only handles the tuning.
+ *
+ * The info necessary to drive the shark2 was taken from the small userspace
+ * shark2.c program by Hisaaki Shibata, 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 "radio-tea5777.h"
+
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("Griffin radioSHARK2, USB radio receiver driver");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0);
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+
+#define SHARK_IN_EP             0x83
+#define SHARK_OUT_EP            0x05
+
+#define TB_LEN 7
+#define DRV_NAME "radioshark2"
+
+#define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev)
+
+enum { BLUE_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_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,
+        },
+        [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 radio_tea5777 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;
+};
+
+static atomic_t shark_instance = ATOMIC_INIT(0);
+
+static int shark_write_reg(struct radio_tea5777 *tea, u64 reg)
+{
+        struct shark_device *shark = tea->private_data;
+        int i, res, actual_len;
+
+        memset(shark->transfer_buffer, 0, TB_LEN);
+        shark->transfer_buffer[0] = 0x81; /* Write register command */
+        for (i = 0; i < 6; i++)
+                shark->transfer_buffer[i + 1] = (reg >> (40 - i * 8)) & 0xff;
+
+        v4l2_dbg(1, debug, tea->v4l2_dev,
+                 "shark2-write: %02x %02x %02x %02x %02x %02x %02x\n",
+                 shark->transfer_buffer[0], shark->transfer_buffer[1],
+                 shark->transfer_buffer[2], shark->transfer_buffer[3],
+                 shark->transfer_buffer[4], shark->transfer_buffer[5],
+                 shark->transfer_buffer[6]);
+
+        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(tea->v4l2_dev, "write error: %d\n", res);
+                return res;
+        }
+
+        return 0;
+}
+
+static int shark_read_reg(struct radio_tea5777 *tea, u32 *reg_ret)
+{
+        struct shark_device *shark = tea->private_data;
+        int i, res, actual_len;
+        u32 reg = 0;
+
+        memset(shark->transfer_buffer, 0, TB_LEN);
+        shark->transfer_buffer[0] = 0x82;
+        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(tea->v4l2_dev, "request-read error: %d\n", res);
+                return res;
+        }
+
+        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(tea->v4l2_dev, "read error: %d\n", res);
+                return res;
+        }
+
+        for (i = 0; i < 3; i++)
+                reg |= shark->transfer_buffer[i] << (16 - i * 8);
+
+        v4l2_dbg(1, debug, tea->v4l2_dev, "shark2-read: %02x %02x %02x\n",
+                 shark->transfer_buffer[0], shark->transfer_buffer[1],
+                 shark->transfer_buffer[2]);
+
+        *reg_ret = reg;
+        return 0;
+}
+
+static struct radio_tea5777_ops shark_tea_ops = {
+        .write_reg = shark_write_reg,
+        .read_reg  = shark_read_reg,
+};
+
+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 < 2; i++) {
+                if (!test_and_clear_bit(i, &shark->brightness_new))
+                        continue;
+
+                brightness = atomic_read(&shark->brightness[i]);
+                memset(shark->transfer_buffer, 0, TB_LEN);
+                shark->transfer_buffer[0] = 0x83 + i;
+                shark->transfer_buffer[1] = brightness;
+                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, "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_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);
+        radio_tea5777_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.ops = &shark_tea_ops;
+        shark->tea.has_am = true;
+        shark->tea.write_before_read = true;
+        strlcpy(shark->tea.card, "Griffin radioSHARK2",
+                sizeof(shark->tea.card));
+        usb_make_path(shark->usbdev, shark->tea.bus_info,
+                sizeof(shark->tea.bus_info));
+
+        retval = radio_tea5777_init(&shark->tea, THIS_MODULE);
+        if (retval) {
+                v4l2_err(&shark->v4l2_dev, "couldn't init tea5777\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 radio_tea5777_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 = 0x0010,
+          .bcdDevice_hi = 0x0010,
+          .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);