radio-aztech.c
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/*
* radio-aztech.c - Aztech radio card driver
*
* Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl>
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
* Adapted to support the Video for Linux API by
* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
*
* Quay Ly
* Donald Song
* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
*
* Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* udelay */
#include <linux/videodev2.h> /* kernel radio structs */
#include <linux/io.h> /* outb, outb_p */
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include "radio-isa.h"
#include "lm7000.h"
MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the Aztech radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0.0");
/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
#ifndef CONFIG_RADIO_AZTECH_PORT
#define CONFIG_RADIO_AZTECH_PORT -1
#endif
#define AZTECH_MAX 2
static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT,
[1 ... (AZTECH_MAX - 1)] = -1 };
static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 };
static const int radio_wait_time = 1000;
module_param_array(io, int, NULL, 0444);
MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)");
module_param_array(radio_nr, int, NULL, 0444);
MODULE_PARM_DESC(radio_nr, "Radio device numbers");
struct aztech {
struct radio_isa_card isa;
int curvol;
};
/* bit definitions for register read */
#define AZTECH_BIT_NOT_TUNED (1 << 0)
#define AZTECH_BIT_MONO (1 << 1)
/* bit definitions for register write */
#define AZTECH_BIT_TUN_CE (1 << 1)
#define AZTECH_BIT_TUN_CLK (1 << 6)
#define AZTECH_BIT_TUN_DATA (1 << 7)
/* bits 0 and 2 are volume control, bits 3..5 are not connected */
static void aztech_set_pins(void *handle, u8 pins)
{
struct radio_isa_card *isa = handle;
struct aztech *az = container_of(isa, struct aztech, isa);
u8 bits = az->curvol;
if (pins & LM7000_DATA)
bits |= AZTECH_BIT_TUN_DATA;
if (pins & LM7000_CLK)
bits |= AZTECH_BIT_TUN_CLK;
if (pins & LM7000_CE)
bits |= AZTECH_BIT_TUN_CE;
outb_p(bits, az->isa.io);
}
static struct radio_isa_card *aztech_alloc(void)
{
struct aztech *az = kzalloc(sizeof(*az), GFP_KERNEL);
return az ? &az->isa : NULL;
}
static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq)
{
lm7000_set_freq(freq, isa, aztech_set_pins);
return 0;
}
static u32 aztech_g_rxsubchans(struct radio_isa_card *isa)
{
if (inb(isa->io) & AZTECH_BIT_MONO)
return V4L2_TUNER_SUB_MONO;
return V4L2_TUNER_SUB_STEREO;
}
static u32 aztech_g_signal(struct radio_isa_card *isa)
{
return (inb(isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff;
}
static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
{
struct aztech *az = container_of(isa, struct aztech, isa);
if (mute)
vol = 0;
az->curvol = (vol & 1) + ((vol & 2) << 1);
outb(az->curvol, isa->io);
return 0;
}
static const struct radio_isa_ops aztech_ops = {
.alloc = aztech_alloc,
.s_mute_volume = aztech_s_mute_volume,
.s_frequency = aztech_s_frequency,
.g_rxsubchans = aztech_g_rxsubchans,
.g_signal = aztech_g_signal,
};
static const int aztech_ioports[] = { 0x350, 0x358 };
static struct radio_isa_driver aztech_driver = {
.driver = {
.match = radio_isa_match,
.probe = radio_isa_probe,
.remove = radio_isa_remove,
.driver = {
.name = "radio-aztech",
},
},
.io_params = io,
.radio_nr_params = radio_nr,
.io_ports = aztech_ioports,
.num_of_io_ports = ARRAY_SIZE(aztech_ioports),
.region_size = 8,
.card = "Aztech Radio",
.ops = &aztech_ops,
.has_stereo = true,
.max_volume = 3,
};
static int __init aztech_init(void)
{
return isa_register_driver(&aztech_driver.driver, AZTECH_MAX);
}
static void __exit aztech_exit(void)
{
isa_unregister_driver(&aztech_driver.driver);
}
module_init(aztech_init);
module_exit(aztech_exit);