diff options
Diffstat (limited to 'drivers/media/radio/radio-aimslab.c')
| -rw-r--r-- | drivers/media/radio/radio-aimslab.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aimslab.c b/drivers/media/radio/radio-aimslab.c new file mode 100644 index 000000000..0e9a37877 --- /dev/null +++ b/drivers/media/radio/radio-aimslab.c @@ -0,0 +1,195 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AimsLab RadioTrack (aka RadioVeveal) driver + * + * Copyright 1997 M. Kirkwood + * + * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com> + * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org> + * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk> + * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> + * + * Notes on the hardware (reverse engineered from other peoples' + * reverse engineering of AIMS' code :-) + * + * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); + * + * The signal strength query is unsurprisingly inaccurate. And it seems + * to indicate that (on my card, at least) the frequency setting isn't + * too great. (I have to tune up .025MHz from what the freq should be + * to get a report that the thing is tuned.) + * + * Volume control is (ugh) analogue: + * out(port, start_increasing_volume); + * wait(a_wee_while); + * out(port, stop_changing_the_volume); + * + * 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> /* msleep */ +#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("M. Kirkwood"); +MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card."); +MODULE_LICENSE("GPL"); +MODULE_VERSION("1.0.0"); + +#ifndef CONFIG_RADIO_RTRACK_PORT +#define CONFIG_RADIO_RTRACK_PORT -1 +#endif + +#define RTRACK_MAX 2 + +static int io[RTRACK_MAX] = { [0] = CONFIG_RADIO_RTRACK_PORT, + [1 ... (RTRACK_MAX - 1)] = -1 }; +static int radio_nr[RTRACK_MAX] = { [0 ... (RTRACK_MAX - 1)] = -1 }; + +module_param_array(io, int, NULL, 0444); +MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)"); +module_param_array(radio_nr, int, NULL, 0444); +MODULE_PARM_DESC(radio_nr, "Radio device numbers"); + +struct rtrack { + struct radio_isa_card isa; + int curvol; +}; + +static struct radio_isa_card *rtrack_alloc(void) +{ + struct rtrack *rt = kzalloc(sizeof(struct rtrack), GFP_KERNEL); + + if (rt) + rt->curvol = 0xff; + return rt ? &rt->isa : NULL; +} + +#define AIMS_BIT_TUN_CE (1 << 0) +#define AIMS_BIT_TUN_CLK (1 << 1) +#define AIMS_BIT_TUN_DATA (1 << 2) +#define AIMS_BIT_VOL_CE (1 << 3) +#define AIMS_BIT_TUN_STRQ (1 << 4) +/* bit 5 is not connected */ +#define AIMS_BIT_VOL_UP (1 << 6) /* active low */ +#define AIMS_BIT_VOL_DN (1 << 7) /* active low */ + +static void rtrack_set_pins(void *handle, u8 pins) +{ + struct radio_isa_card *isa = handle; + struct rtrack *rt = container_of(isa, struct rtrack, isa); + u8 bits = AIMS_BIT_VOL_DN | AIMS_BIT_VOL_UP | AIMS_BIT_TUN_STRQ; + + if (!v4l2_ctrl_g_ctrl(rt->isa.mute)) + bits |= AIMS_BIT_VOL_CE; + + if (pins & LM7000_DATA) + bits |= AIMS_BIT_TUN_DATA; + if (pins & LM7000_CLK) + bits |= AIMS_BIT_TUN_CLK; + if (pins & LM7000_CE) + bits |= AIMS_BIT_TUN_CE; + + outb_p(bits, rt->isa.io); +} + +static int rtrack_s_frequency(struct radio_isa_card *isa, u32 freq) +{ + lm7000_set_freq(freq, isa, rtrack_set_pins); + + return 0; +} + +static u32 rtrack_g_signal(struct radio_isa_card *isa) +{ + /* bit set = no signal present */ + return 0xffff * !(inb(isa->io) & 2); +} + +static int rtrack_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) +{ + struct rtrack *rt = container_of(isa, struct rtrack, isa); + int curvol = rt->curvol; + + if (mute) { + outb(0xd0, isa->io); /* volume steady + sigstr + off */ + return 0; + } + if (vol == 0) { /* volume = 0 means mute the card */ + outb(0x48, isa->io); /* volume down but still "on" */ + msleep(curvol * 3); /* make sure it's totally down */ + } else if (curvol < vol) { + outb(0x98, isa->io); /* volume up + sigstr + on */ + for (; curvol < vol; curvol++) + mdelay(3); + } else if (curvol > vol) { + outb(0x58, isa->io); /* volume down + sigstr + on */ + for (; curvol > vol; curvol--) + mdelay(3); + } + outb(0xd8, isa->io); /* volume steady + sigstr + on */ + rt->curvol = vol; + return 0; +} + +/* Mute card - prevents noisy bootups */ +static int rtrack_initialize(struct radio_isa_card *isa) +{ + /* this ensures that the volume is all the way up */ + outb(0x90, isa->io); /* volume up but still "on" */ + msleep(3000); /* make sure it's totally up */ + outb(0xc0, isa->io); /* steady volume, mute card */ + return 0; +} + +static const struct radio_isa_ops rtrack_ops = { + .alloc = rtrack_alloc, + .init = rtrack_initialize, + .s_mute_volume = rtrack_s_mute_volume, + .s_frequency = rtrack_s_frequency, + .g_signal = rtrack_g_signal, +}; + +static const int rtrack_ioports[] = { 0x20f, 0x30f }; + +static struct radio_isa_driver rtrack_driver = { + .driver = { + .match = radio_isa_match, + .probe = radio_isa_probe, + .remove = radio_isa_remove, + .driver = { + .name = "radio-aimslab", + }, + }, + .io_params = io, + .radio_nr_params = radio_nr, + .io_ports = rtrack_ioports, + .num_of_io_ports = ARRAY_SIZE(rtrack_ioports), + .region_size = 2, + .card = "AIMSlab RadioTrack/RadioReveal", + .ops = &rtrack_ops, + .has_stereo = true, + .max_volume = 0xff, +}; + +static int __init rtrack_init(void) +{ + return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX); +} + +static void __exit rtrack_exit(void) +{ + isa_unregister_driver(&rtrack_driver.driver); +} + +module_init(rtrack_init); +module_exit(rtrack_exit); |