211 lines
6.1 KiB
C
211 lines
6.1 KiB
C
/*
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* AimsLab RadioTrack (aka RadioVeveal) driver
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*
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* Copyright 1997 M. Kirkwood
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*
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* Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
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* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
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* Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
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* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
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*
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* Notes on the hardware (reverse engineered from other peoples'
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* reverse engineering of AIMS' code :-)
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*
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* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
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*
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* The signal strength query is unsurprisingly inaccurate. And it seems
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* to indicate that (on my card, at least) the frequency setting isn't
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* too great. (I have to tune up .025MHz from what the freq should be
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* to get a report that the thing is tuned.)
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*
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* Volume control is (ugh) analogue:
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* out(port, start_increasing_volume);
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* wait(a_wee_while);
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* out(port, stop_changing_the_volume);
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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> /* msleep */
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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("M. Kirkwood");
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MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1.0.0");
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#ifndef CONFIG_RADIO_RTRACK_PORT
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#define CONFIG_RADIO_RTRACK_PORT -1
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#endif
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#define RTRACK_MAX 2
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static int io[RTRACK_MAX] = { [0] = CONFIG_RADIO_RTRACK_PORT,
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[1 ... (RTRACK_MAX - 1)] = -1 };
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static int radio_nr[RTRACK_MAX] = { [0 ... (RTRACK_MAX - 1)] = -1 };
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module_param_array(io, int, NULL, 0444);
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MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
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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 rtrack {
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struct radio_isa_card isa;
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int curvol;
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};
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static struct radio_isa_card *rtrack_alloc(void)
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{
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struct rtrack *rt = kzalloc(sizeof(struct rtrack), GFP_KERNEL);
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if (rt)
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rt->curvol = 0xff;
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return rt ? &rt->isa : NULL;
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}
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/* The 128+64 on these outb's is to keep the volume stable while tuning.
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* Without them, the volume _will_ creep up with each frequency change
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* and bit 4 (+16) is to keep the signal strength meter enabled.
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*/
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static void send_0_byte(struct radio_isa_card *isa, int on)
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{
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outb_p(128+64+16+on+1, isa->io); /* wr-enable + data low */
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outb_p(128+64+16+on+2+1, isa->io); /* clock */
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msleep(1);
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}
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static void send_1_byte(struct radio_isa_card *isa, int on)
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{
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outb_p(128+64+16+on+4+1, isa->io); /* wr-enable+data high */
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outb_p(128+64+16+on+4+2+1, isa->io); /* clock */
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msleep(1);
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}
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static int rtrack_s_frequency(struct radio_isa_card *isa, u32 freq)
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{
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int on = v4l2_ctrl_g_ctrl(isa->mute) ? 0 : 8;
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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(isa, on); /* 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(isa, on);
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else
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send_0_byte(isa, on);
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send_0_byte(isa, on); /* 14: test bit - always 0 */
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send_0_byte(isa, on); /* 15: test bit - always 0 */
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send_0_byte(isa, on); /* 16: band data 0 - always 0 */
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send_0_byte(isa, on); /* 17: band data 1 - always 0 */
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send_0_byte(isa, on); /* 18: band data 2 - always 0 */
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send_0_byte(isa, on); /* 19: time base - always 0 */
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send_0_byte(isa, on); /* 20: spacing (0 = 25 kHz) */
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send_1_byte(isa, on); /* 21: spacing (1 = 25 kHz) */
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send_0_byte(isa, on); /* 22: spacing (0 = 25 kHz) */
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send_1_byte(isa, on); /* 23: AM/FM (FM = 1, always) */
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outb(0xd0 + on, isa->io); /* volume steady + sigstr */
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return 0;
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}
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static u32 rtrack_g_signal(struct radio_isa_card *isa)
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{
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/* bit set = no signal present */
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return 0xffff * !(inb(isa->io) & 2);
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}
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static int rtrack_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
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{
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struct rtrack *rt = container_of(isa, struct rtrack, isa);
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int curvol = rt->curvol;
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if (mute) {
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outb(0xd0, isa->io); /* volume steady + sigstr + off */
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return 0;
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}
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if (vol == 0) { /* volume = 0 means mute the card */
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outb(0x48, isa->io); /* volume down but still "on" */
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msleep(curvol * 3); /* make sure it's totally down */
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} else if (curvol < vol) {
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outb(0x98, isa->io); /* volume up + sigstr + on */
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for (; curvol < vol; curvol++)
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udelay(3000);
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} else if (curvol > vol) {
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outb(0x58, isa->io); /* volume down + sigstr + on */
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for (; curvol > vol; curvol--)
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udelay(3000);
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}
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outb(0xd8, isa->io); /* volume steady + sigstr + on */
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rt->curvol = vol;
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return 0;
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}
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/* Mute card - prevents noisy bootups */
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static int rtrack_initialize(struct radio_isa_card *isa)
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{
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/* this ensures that the volume is all the way up */
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outb(0x90, isa->io); /* volume up but still "on" */
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msleep(3000); /* make sure it's totally up */
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outb(0xc0, isa->io); /* steady volume, mute card */
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return 0;
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}
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static const struct radio_isa_ops rtrack_ops = {
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.alloc = rtrack_alloc,
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.init = rtrack_initialize,
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.s_mute_volume = rtrack_s_mute_volume,
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.s_frequency = rtrack_s_frequency,
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.g_signal = rtrack_g_signal,
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};
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static const int rtrack_ioports[] = { 0x20f, 0x30f };
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static struct radio_isa_driver rtrack_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-aimslab",
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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 = rtrack_ioports,
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.num_of_io_ports = ARRAY_SIZE(rtrack_ioports),
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.region_size = 2,
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.card = "AIMSlab RadioTrack/RadioReveal",
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.ops = &rtrack_ops,
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.has_stereo = true,
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.max_volume = 0xff,
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};
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static int __init rtrack_init(void)
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{
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return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX);
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}
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static void __exit rtrack_exit(void)
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{
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isa_unregister_driver(&rtrack_driver.driver);
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}
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module_init(rtrack_init);
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module_exit(rtrack_exit);
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