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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AimsLab RadioTrack (aka RadioVeveal) driver4 *5 * Copyright 1997 M. Kirkwood6 *7 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>8 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>9 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>10 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>11 *12 * Notes on the hardware (reverse engineered from other peoples'13 * reverse engineering of AIMS' code :-)14 *15 * Frequency control is done digitally -- ie out(port,encodefreq(95.8));16 *17 * The signal strength query is unsurprisingly inaccurate. And it seems18 * to indicate that (on my card, at least) the frequency setting isn't19 * too great. (I have to tune up .025MHz from what the freq should be20 * to get a report that the thing is tuned.)21 *22 * Volume control is (ugh) analogue:23 * out(port, start_increasing_volume);24 * wait(a_wee_while);25 * out(port, stop_changing_the_volume);26 *27 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.28 */29 30#include <linux/module.h> /* Modules */31#include <linux/init.h> /* Initdata */32#include <linux/ioport.h> /* request_region */33#include <linux/delay.h> /* msleep */34#include <linux/videodev2.h> /* kernel radio structs */35#include <linux/io.h> /* outb, outb_p */36#include <linux/slab.h>37#include <media/v4l2-device.h>38#include <media/v4l2-ioctl.h>39#include <media/v4l2-ctrls.h>40#include "radio-isa.h"41#include "lm7000.h"42 43MODULE_AUTHOR("M. Kirkwood");44MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");45MODULE_LICENSE("GPL");46MODULE_VERSION("1.0.0");47 48#ifndef CONFIG_RADIO_RTRACK_PORT49#define CONFIG_RADIO_RTRACK_PORT -150#endif51 52#define RTRACK_MAX 253 54static int io[RTRACK_MAX] = { [0] = CONFIG_RADIO_RTRACK_PORT,55 [1 ... (RTRACK_MAX - 1)] = -1 };56static int radio_nr[RTRACK_MAX] = { [0 ... (RTRACK_MAX - 1)] = -1 };57 58module_param_array(io, int, NULL, 0444);59MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");60module_param_array(radio_nr, int, NULL, 0444);61MODULE_PARM_DESC(radio_nr, "Radio device numbers");62 63struct rtrack {64 struct radio_isa_card isa;65 int curvol;66};67 68static struct radio_isa_card *rtrack_alloc(void)69{70 struct rtrack *rt = kzalloc(sizeof(struct rtrack), GFP_KERNEL);71 72 if (rt)73 rt->curvol = 0xff;74 return rt ? &rt->isa : NULL;75}76 77#define AIMS_BIT_TUN_CE (1 << 0)78#define AIMS_BIT_TUN_CLK (1 << 1)79#define AIMS_BIT_TUN_DATA (1 << 2)80#define AIMS_BIT_VOL_CE (1 << 3)81#define AIMS_BIT_TUN_STRQ (1 << 4)82/* bit 5 is not connected */83#define AIMS_BIT_VOL_UP (1 << 6) /* active low */84#define AIMS_BIT_VOL_DN (1 << 7) /* active low */85 86static void rtrack_set_pins(void *handle, u8 pins)87{88 struct radio_isa_card *isa = handle;89 struct rtrack *rt = container_of(isa, struct rtrack, isa);90 u8 bits = AIMS_BIT_VOL_DN | AIMS_BIT_VOL_UP | AIMS_BIT_TUN_STRQ;91 92 if (!v4l2_ctrl_g_ctrl(rt->isa.mute))93 bits |= AIMS_BIT_VOL_CE;94 95 if (pins & LM7000_DATA)96 bits |= AIMS_BIT_TUN_DATA;97 if (pins & LM7000_CLK)98 bits |= AIMS_BIT_TUN_CLK;99 if (pins & LM7000_CE)100 bits |= AIMS_BIT_TUN_CE;101 102 outb_p(bits, rt->isa.io);103}104 105static int rtrack_s_frequency(struct radio_isa_card *isa, u32 freq)106{107 lm7000_set_freq(freq, isa, rtrack_set_pins);108 109 return 0;110}111 112static u32 rtrack_g_signal(struct radio_isa_card *isa)113{114 /* bit set = no signal present */115 return 0xffff * !(inb(isa->io) & 2);116}117 118static int rtrack_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)119{120 struct rtrack *rt = container_of(isa, struct rtrack, isa);121 int curvol = rt->curvol;122 123 if (mute) {124 outb(0xd0, isa->io); /* volume steady + sigstr + off */125 return 0;126 }127 if (vol == 0) { /* volume = 0 means mute the card */128 outb(0x48, isa->io); /* volume down but still "on" */129 msleep(curvol * 3); /* make sure it's totally down */130 } else if (curvol < vol) {131 outb(0x98, isa->io); /* volume up + sigstr + on */132 for (; curvol < vol; curvol++)133 mdelay(3);134 } else if (curvol > vol) {135 outb(0x58, isa->io); /* volume down + sigstr + on */136 for (; curvol > vol; curvol--)137 mdelay(3);138 }139 outb(0xd8, isa->io); /* volume steady + sigstr + on */140 rt->curvol = vol;141 return 0;142}143 144/* Mute card - prevents noisy bootups */145static int rtrack_initialize(struct radio_isa_card *isa)146{147 /* this ensures that the volume is all the way up */148 outb(0x90, isa->io); /* volume up but still "on" */149 msleep(3000); /* make sure it's totally up */150 outb(0xc0, isa->io); /* steady volume, mute card */151 return 0;152}153 154static const struct radio_isa_ops rtrack_ops = {155 .alloc = rtrack_alloc,156 .init = rtrack_initialize,157 .s_mute_volume = rtrack_s_mute_volume,158 .s_frequency = rtrack_s_frequency,159 .g_signal = rtrack_g_signal,160};161 162static const int rtrack_ioports[] = { 0x20f, 0x30f };163 164static struct radio_isa_driver rtrack_driver = {165 .driver = {166 .match = radio_isa_match,167 .probe = radio_isa_probe,168 .remove = radio_isa_remove,169 .driver = {170 .name = "radio-aimslab",171 },172 },173 .io_params = io,174 .radio_nr_params = radio_nr,175 .io_ports = rtrack_ioports,176 .num_of_io_ports = ARRAY_SIZE(rtrack_ioports),177 .region_size = 2,178 .card = "AIMSlab RadioTrack/RadioReveal",179 .ops = &rtrack_ops,180 .has_stereo = true,181 .max_volume = 0xff,182};183 184static int __init rtrack_init(void)185{186 return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX);187}188 189static void __exit rtrack_exit(void)190{191 isa_unregister_driver(&rtrack_driver.driver);192}193 194module_init(rtrack_init);195module_exit(rtrack_exit);196