/*
* 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 <media/tea575x.h>
#if defined(CONFIG_LEDS_CLASS) || \
(defined(CONFIG_LEDS_CLASS_MODULE) && defined(CONFIG_RADIO_SHARK_MODULE))
#define SHARK_USE_LEDS 1
#endif
/*
* 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)
/* Note BLUE_IS_PULSE comes after NO_LEDS as it is a status bit, not a LED */
enum { BLUE_LED, BLUE_PULSE_LED, RED_LED, NO_LEDS, BLUE_IS_PULSE };
struct shark_device {
struct usb_device *usbdev;
struct v4l2_device v4l2_dev;
struct snd_tea575x tea;
#ifdef SHARK_USE_LEDS
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;
#endif
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,
};
#ifdef SHARK_USE_LEDS
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;
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);
}
}
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);
clear_bit(BLUE_IS_PULSE, &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);
set_bit(BLUE_IS_PULSE, &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 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,
},
};
static int shark_register_leds(struct shark_device *shark, struct device *dev)
{
int i, retval;
atomic_set(&shark->brightness[BLUE_LED], 127);
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];
retval = led_classdev_register(dev, &shark->leds[i]);
if (retval) {
v4l2_err(&shark->v4l2_dev,
"couldn't register led: %s\n",
shark->led_names[i]);
return retval;
}
}
return 0;
}
static void shark_unregister_leds(struct shark_device *shark)
{
int i;
for (i = 0; i < NO_LEDS; i++)
led_classdev_unregister(&shark->leds[i]);
cancel_work_sync(&shark->led_work);
}
static void shark_resume_leds(struct shark_device *shark)
{
if (test_bit(BLUE_IS_PULSE, &shark->brightness_new))
set_bit(BLUE_PULSE_LED, &shark->brightness_new);
else
set_bit(BLUE_LED, &shark->brightness_new);
set_bit(RED_LED, &shark->brightness_new);
schedule_work(&shark->led_work);
}
#else
static int shark_register_leds(struct shark_device *shark, struct device *dev)
{
v4l2_warn(&shark->v4l2_dev,
"CONFIG_LEDS_CLASS not enabled, LED support disabled\n");
return 0;
}
static inline void shark_unregister_leds(struct shark_device *shark) { }
static inline void shark_resume_leds(struct shark_device *shark) { }
#endif
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);
mutex_lock(&shark->tea.mutex);
v4l2_device_disconnect(&shark->v4l2_dev);
snd_tea575x_exit(&shark->tea);
mutex_unlock(&shark->tea.mutex);
shark_unregister_leds(shark);
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);
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 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;
v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);
retval = shark_register_leds(shark, &intf->dev);
if (retval)
goto err_reg_leds;
shark->v4l2_dev.release = usb_shark_release;
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;
shark->tea.has_am = 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;
}
return 0;
err_init_tea:
v4l2_device_unregister(&shark->v4l2_dev);
err_reg_dev:
shark_unregister_leds(shark);
err_reg_leds:
kfree(shark->transfer_buffer);
err_alloc_buffer:
kfree(shark);
return retval;
}
#ifdef CONFIG_PM
static int usb_shark_suspend(struct usb_interface *intf, pm_message_t message)
{
return 0;
}
static int usb_shark_resume(struct usb_interface *intf)
{
struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
mutex_lock(&shark->tea.mutex);
snd_tea575x_set_freq(&shark->tea);
mutex_unlock(&shark->tea.mutex);
shark_resume_leds(shark);
return 0;
}
#endif
/* 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,
#ifdef CONFIG_PM
.suspend = usb_shark_suspend,
.resume = usb_shark_resume,
.reset_resume = usb_shark_resume,
#endif
};
module_usb_driver(usb_shark_driver);
