187 lines
4.9 KiB
C
187 lines
4.9 KiB
C
/*
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* radio-aztech.c - Aztech radio card driver
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*
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* Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl>
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* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
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* Adapted to support the Video for Linux API by
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* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
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*
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* Quay Ly
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* Donald Song
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* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
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* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
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* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
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*
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* Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
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*/
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#include <linux/module.h> /* Modules */
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#include <linux/init.h> /* Initdata */
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#include <linux/ioport.h> /* request_region */
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#include <linux/delay.h> /* udelay */
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#include <linux/videodev2.h> /* kernel radio structs */
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#include <linux/io.h> /* outb, outb_p */
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#include <linux/slab.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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#include "radio-isa.h"
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MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
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MODULE_DESCRIPTION("A driver for the Aztech radio card.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1.0.0");
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/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
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#ifndef CONFIG_RADIO_AZTECH_PORT
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#define CONFIG_RADIO_AZTECH_PORT -1
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#endif
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#define AZTECH_MAX 2
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static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT,
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[1 ... (AZTECH_MAX - 1)] = -1 };
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static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 };
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static const int radio_wait_time = 1000;
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module_param_array(io, int, NULL, 0444);
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MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)");
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module_param_array(radio_nr, int, NULL, 0444);
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MODULE_PARM_DESC(radio_nr, "Radio device numbers");
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struct aztech {
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struct radio_isa_card isa;
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int curvol;
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};
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static void send_0_byte(struct aztech *az)
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{
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udelay(radio_wait_time);
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outb_p(2 + az->curvol, az->isa.io);
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outb_p(64 + 2 + az->curvol, az->isa.io);
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}
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static void send_1_byte(struct aztech *az)
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{
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udelay(radio_wait_time);
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outb_p(128 + 2 + az->curvol, az->isa.io);
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outb_p(128 + 64 + 2 + az->curvol, az->isa.io);
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}
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static struct radio_isa_card *aztech_alloc(void)
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{
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struct aztech *az = kzalloc(sizeof(*az), GFP_KERNEL);
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return az ? &az->isa : NULL;
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}
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static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq)
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{
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struct aztech *az = container_of(isa, struct aztech, isa);
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int i;
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freq += 171200; /* Add 10.7 MHz IF */
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freq /= 800; /* Convert to 50 kHz units */
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send_0_byte(az); /* 0: LSB of frequency */
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for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
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if (freq & (1 << i))
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send_1_byte(az);
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else
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send_0_byte(az);
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send_0_byte(az); /* 14: test bit - always 0 */
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send_0_byte(az); /* 15: test bit - always 0 */
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send_0_byte(az); /* 16: band data 0 - always 0 */
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if (isa->stereo) /* 17: stereo (1 to enable) */
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send_1_byte(az);
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else
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send_0_byte(az);
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send_1_byte(az); /* 18: band data 1 - unknown */
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send_0_byte(az); /* 19: time base - always 0 */
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send_0_byte(az); /* 20: spacing (0 = 25 kHz) */
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send_1_byte(az); /* 21: spacing (1 = 25 kHz) */
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send_0_byte(az); /* 22: spacing (0 = 25 kHz) */
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send_1_byte(az); /* 23: AM/FM (FM = 1, always) */
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/* latch frequency */
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udelay(radio_wait_time);
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outb_p(128 + 64 + az->curvol, az->isa.io);
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return 0;
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}
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/* thanks to Michael Dwyer for giving me a dose of clues in
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* the signal strength department..
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*
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* This card has a stereo bit - bit 0 set = mono, not set = stereo
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*/
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static u32 aztech_g_rxsubchans(struct radio_isa_card *isa)
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{
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if (inb(isa->io) & 1)
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return V4L2_TUNER_SUB_MONO;
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return V4L2_TUNER_SUB_STEREO;
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}
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static int aztech_s_stereo(struct radio_isa_card *isa, bool stereo)
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{
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return aztech_s_frequency(isa, isa->freq);
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}
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static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
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{
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struct aztech *az = container_of(isa, struct aztech, isa);
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if (mute)
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vol = 0;
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az->curvol = (vol & 1) + ((vol & 2) << 1);
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outb(az->curvol, isa->io);
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return 0;
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}
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static const struct radio_isa_ops aztech_ops = {
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.alloc = aztech_alloc,
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.s_mute_volume = aztech_s_mute_volume,
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.s_frequency = aztech_s_frequency,
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.s_stereo = aztech_s_stereo,
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.g_rxsubchans = aztech_g_rxsubchans,
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};
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static const int aztech_ioports[] = { 0x350, 0x358 };
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static struct radio_isa_driver aztech_driver = {
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.driver = {
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.match = radio_isa_match,
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.probe = radio_isa_probe,
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.remove = radio_isa_remove,
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.driver = {
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.name = "radio-aztech",
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},
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},
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.io_params = io,
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.radio_nr_params = radio_nr,
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.io_ports = aztech_ioports,
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.num_of_io_ports = ARRAY_SIZE(aztech_ioports),
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.region_size = 2,
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.card = "Aztech Radio",
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.ops = &aztech_ops,
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.has_stereo = true,
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.max_volume = 3,
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};
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static int __init aztech_init(void)
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{
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return isa_register_driver(&aztech_driver.driver, AZTECH_MAX);
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}
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static void __exit aztech_exit(void)
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{
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isa_unregister_driver(&aztech_driver.driver);
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}
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module_init(aztech_init);
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module_exit(aztech_exit);
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