389 lines
10 KiB
C
389 lines
10 KiB
C
/*
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* Linux V4L2 radio driver for the Griffin radioSHARK2 USB radio receiver
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*
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* Note the radioSHARK2 offers the audio through a regular USB audio device,
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* this driver only handles the tuning.
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*
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* The info necessary to drive the shark2 was taken from the small userspace
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* shark2.c program by Hisaaki Shibata, which he kindly placed in the Public
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* Domain.
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*
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* Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/workqueue.h>
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#include <media/v4l2-device.h>
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#include "radio-tea5777.h"
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#if defined(CONFIG_LEDS_CLASS) || \
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(defined(CONFIG_LEDS_CLASS_MODULE) && defined(CONFIG_RADIO_SHARK2_MODULE))
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#define SHARK_USE_LEDS 1
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#endif
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("Griffin radioSHARK2, USB radio receiver driver");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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#define SHARK_IN_EP 0x83
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#define SHARK_OUT_EP 0x05
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#define TB_LEN 7
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#define DRV_NAME "radioshark2"
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#define v4l2_dev_to_shark(d) container_of(d, struct shark_device, v4l2_dev)
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enum { BLUE_LED, RED_LED, NO_LEDS };
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struct shark_device {
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struct usb_device *usbdev;
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struct v4l2_device v4l2_dev;
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struct radio_tea5777 tea;
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#ifdef SHARK_USE_LEDS
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struct work_struct led_work;
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struct led_classdev leds[NO_LEDS];
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char led_names[NO_LEDS][32];
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atomic_t brightness[NO_LEDS];
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unsigned long brightness_new;
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#endif
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u8 *transfer_buffer;
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};
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static atomic_t shark_instance = ATOMIC_INIT(0);
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static int shark_write_reg(struct radio_tea5777 *tea, u64 reg)
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{
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struct shark_device *shark = tea->private_data;
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int i, res, actual_len;
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memset(shark->transfer_buffer, 0, TB_LEN);
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shark->transfer_buffer[0] = 0x81; /* Write register command */
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for (i = 0; i < 6; i++)
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shark->transfer_buffer[i + 1] = (reg >> (40 - i * 8)) & 0xff;
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v4l2_dbg(1, debug, tea->v4l2_dev, "shark2-write: %*ph\n",
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7, shark->transfer_buffer);
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res = usb_interrupt_msg(shark->usbdev,
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usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
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shark->transfer_buffer, TB_LEN,
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&actual_len, 1000);
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if (res < 0) {
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v4l2_err(tea->v4l2_dev, "write error: %d\n", res);
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return res;
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}
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return 0;
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}
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static int shark_read_reg(struct radio_tea5777 *tea, u32 *reg_ret)
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{
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struct shark_device *shark = tea->private_data;
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int i, res, actual_len;
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u32 reg = 0;
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memset(shark->transfer_buffer, 0, TB_LEN);
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shark->transfer_buffer[0] = 0x82;
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res = usb_interrupt_msg(shark->usbdev,
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usb_sndintpipe(shark->usbdev, SHARK_OUT_EP),
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shark->transfer_buffer, TB_LEN,
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&actual_len, 1000);
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if (res < 0) {
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v4l2_err(tea->v4l2_dev, "request-read error: %d\n", res);
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return res;
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}
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res = usb_interrupt_msg(shark->usbdev,
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usb_rcvintpipe(shark->usbdev, SHARK_IN_EP),
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shark->transfer_buffer, TB_LEN,
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&actual_len, 1000);
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if (res < 0) {
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v4l2_err(tea->v4l2_dev, "read error: %d\n", res);
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return res;
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}
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for (i = 0; i < 3; i++)
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reg |= shark->transfer_buffer[i] << (16 - i * 8);
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v4l2_dbg(1, debug, tea->v4l2_dev, "shark2-read: %*ph\n",
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3, shark->transfer_buffer);
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*reg_ret = reg;
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return 0;
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}
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static struct radio_tea5777_ops shark_tea_ops = {
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.write_reg = shark_write_reg,
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.read_reg = shark_read_reg,
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};
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#ifdef SHARK_USE_LEDS
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static void shark_led_work(struct work_struct *work)
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{
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struct shark_device *shark =
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container_of(work, struct shark_device, led_work);
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int i, res, brightness, actual_len;
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for (i = 0; i < 2; i++) {
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if (!test_and_clear_bit(i, &shark->brightness_new))
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continue;
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brightness = atomic_read(&shark->brightness[i]);
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memset(shark->transfer_buffer, 0, TB_LEN);
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shark->transfer_buffer[0] = 0x83 + i;
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shark->transfer_buffer[1] = brightness;
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res = usb_interrupt_msg(shark->usbdev,
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usb_sndintpipe(shark->usbdev,
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SHARK_OUT_EP),
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shark->transfer_buffer, TB_LEN,
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&actual_len, 1000);
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if (res < 0)
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v4l2_err(&shark->v4l2_dev, "set LED %s error: %d\n",
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shark->led_names[i], res);
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}
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}
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static void shark_led_set_blue(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct shark_device *shark =
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container_of(led_cdev, struct shark_device, leds[BLUE_LED]);
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atomic_set(&shark->brightness[BLUE_LED], value);
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set_bit(BLUE_LED, &shark->brightness_new);
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schedule_work(&shark->led_work);
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}
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static void shark_led_set_red(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct shark_device *shark =
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container_of(led_cdev, struct shark_device, leds[RED_LED]);
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atomic_set(&shark->brightness[RED_LED], value);
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set_bit(RED_LED, &shark->brightness_new);
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schedule_work(&shark->led_work);
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}
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static const struct led_classdev shark_led_templates[NO_LEDS] = {
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[BLUE_LED] = {
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.name = "%s:blue:",
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.brightness = LED_OFF,
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.max_brightness = 127,
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.brightness_set = shark_led_set_blue,
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},
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[RED_LED] = {
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.name = "%s:red:",
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.brightness = LED_OFF,
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.max_brightness = 1,
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.brightness_set = shark_led_set_red,
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},
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};
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static int shark_register_leds(struct shark_device *shark, struct device *dev)
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{
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int i, retval;
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atomic_set(&shark->brightness[BLUE_LED], 127);
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INIT_WORK(&shark->led_work, shark_led_work);
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for (i = 0; i < NO_LEDS; i++) {
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shark->leds[i] = shark_led_templates[i];
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snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
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shark->leds[i].name, shark->v4l2_dev.name);
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shark->leds[i].name = shark->led_names[i];
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retval = led_classdev_register(dev, &shark->leds[i]);
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if (retval) {
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v4l2_err(&shark->v4l2_dev,
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"couldn't register led: %s\n",
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shark->led_names[i]);
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return retval;
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}
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}
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return 0;
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}
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static void shark_unregister_leds(struct shark_device *shark)
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{
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int i;
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for (i = 0; i < NO_LEDS; i++)
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led_classdev_unregister(&shark->leds[i]);
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cancel_work_sync(&shark->led_work);
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}
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static inline void shark_resume_leds(struct shark_device *shark)
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{
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int i;
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for (i = 0; i < NO_LEDS; i++)
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set_bit(i, &shark->brightness_new);
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schedule_work(&shark->led_work);
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}
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#else
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static int shark_register_leds(struct shark_device *shark, struct device *dev)
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{
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v4l2_warn(&shark->v4l2_dev,
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"CONFIG_LEDS_CLASS not enabled, LED support disabled\n");
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return 0;
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}
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static inline void shark_unregister_leds(struct shark_device *shark) { }
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static inline void shark_resume_leds(struct shark_device *shark) { }
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#endif
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static void usb_shark_disconnect(struct usb_interface *intf)
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{
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struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
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struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
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mutex_lock(&shark->tea.mutex);
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v4l2_device_disconnect(&shark->v4l2_dev);
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radio_tea5777_exit(&shark->tea);
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mutex_unlock(&shark->tea.mutex);
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shark_unregister_leds(shark);
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v4l2_device_put(&shark->v4l2_dev);
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}
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static void usb_shark_release(struct v4l2_device *v4l2_dev)
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{
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struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
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v4l2_device_unregister(&shark->v4l2_dev);
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kfree(shark->transfer_buffer);
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kfree(shark);
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}
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static int usb_shark_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct shark_device *shark;
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int retval = -ENOMEM;
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shark = kzalloc(sizeof(struct shark_device), GFP_KERNEL);
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if (!shark)
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return retval;
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shark->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL);
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if (!shark->transfer_buffer)
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goto err_alloc_buffer;
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v4l2_device_set_name(&shark->v4l2_dev, DRV_NAME, &shark_instance);
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retval = shark_register_leds(shark, &intf->dev);
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if (retval)
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goto err_reg_leds;
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shark->v4l2_dev.release = usb_shark_release;
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retval = v4l2_device_register(&intf->dev, &shark->v4l2_dev);
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if (retval) {
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v4l2_err(&shark->v4l2_dev, "couldn't register v4l2_device\n");
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goto err_reg_dev;
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}
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shark->usbdev = interface_to_usbdev(intf);
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shark->tea.v4l2_dev = &shark->v4l2_dev;
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shark->tea.private_data = shark;
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shark->tea.ops = &shark_tea_ops;
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shark->tea.has_am = true;
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shark->tea.write_before_read = true;
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strlcpy(shark->tea.card, "Griffin radioSHARK2",
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sizeof(shark->tea.card));
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usb_make_path(shark->usbdev, shark->tea.bus_info,
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sizeof(shark->tea.bus_info));
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retval = radio_tea5777_init(&shark->tea, THIS_MODULE);
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if (retval) {
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v4l2_err(&shark->v4l2_dev, "couldn't init tea5777\n");
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goto err_init_tea;
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}
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return 0;
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err_init_tea:
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v4l2_device_unregister(&shark->v4l2_dev);
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err_reg_dev:
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shark_unregister_leds(shark);
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err_reg_leds:
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kfree(shark->transfer_buffer);
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err_alloc_buffer:
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kfree(shark);
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return retval;
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}
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#ifdef CONFIG_PM
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static int usb_shark_suspend(struct usb_interface *intf, pm_message_t message)
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{
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return 0;
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}
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static int usb_shark_resume(struct usb_interface *intf)
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{
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struct v4l2_device *v4l2_dev = usb_get_intfdata(intf);
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struct shark_device *shark = v4l2_dev_to_shark(v4l2_dev);
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int ret;
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mutex_lock(&shark->tea.mutex);
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ret = radio_tea5777_set_freq(&shark->tea);
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mutex_unlock(&shark->tea.mutex);
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shark_resume_leds(shark);
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return ret;
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}
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#endif
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/* Specify the bcdDevice value, as the radioSHARK and radioSHARK2 share ids */
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static struct usb_device_id usb_shark_device_table[] = {
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{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION |
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USB_DEVICE_ID_MATCH_INT_CLASS,
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.idVendor = 0x077d,
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.idProduct = 0x627a,
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.bcdDevice_lo = 0x0010,
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.bcdDevice_hi = 0x0010,
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.bInterfaceClass = 3,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(usb, usb_shark_device_table);
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static struct usb_driver usb_shark_driver = {
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.name = DRV_NAME,
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.probe = usb_shark_probe,
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.disconnect = usb_shark_disconnect,
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.id_table = usb_shark_device_table,
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#ifdef CONFIG_PM
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.suspend = usb_shark_suspend,
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.resume = usb_shark_resume,
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.reset_resume = usb_shark_resume,
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#endif
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};
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module_usb_driver(usb_shark_driver);
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