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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /drivers/media/radio/radio-aimslab.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'drivers/media/radio/radio-aimslab.c')
-rw-r--r-- | drivers/media/radio/radio-aimslab.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aimslab.c b/drivers/media/radio/radio-aimslab.c new file mode 100644 index 00000000..98e0c8c2 --- /dev/null +++ b/drivers/media/radio/radio-aimslab.c @@ -0,0 +1,210 @@ +/* + * 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@infradead.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" + +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; +} + +/* The 128+64 on these outb's is to keep the volume stable while tuning. + * Without them, the volume _will_ creep up with each frequency change + * and bit 4 (+16) is to keep the signal strength meter enabled. + */ + +static void send_0_byte(struct radio_isa_card *isa, int on) +{ + outb_p(128+64+16+on+1, isa->io); /* wr-enable + data low */ + outb_p(128+64+16+on+2+1, isa->io); /* clock */ + msleep(1); +} + +static void send_1_byte(struct radio_isa_card *isa, int on) +{ + outb_p(128+64+16+on+4+1, isa->io); /* wr-enable+data high */ + outb_p(128+64+16+on+4+2+1, isa->io); /* clock */ + msleep(1); +} + +static int rtrack_s_frequency(struct radio_isa_card *isa, u32 freq) +{ + int on = v4l2_ctrl_g_ctrl(isa->mute) ? 0 : 8; + int i; + + freq += 171200; /* Add 10.7 MHz IF */ + freq /= 800; /* Convert to 50 kHz units */ + + send_0_byte(isa, on); /* 0: LSB of frequency */ + + for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ + if (freq & (1 << i)) + send_1_byte(isa, on); + else + send_0_byte(isa, on); + + send_0_byte(isa, on); /* 14: test bit - always 0 */ + send_0_byte(isa, on); /* 15: test bit - always 0 */ + + send_0_byte(isa, on); /* 16: band data 0 - always 0 */ + send_0_byte(isa, on); /* 17: band data 1 - always 0 */ + send_0_byte(isa, on); /* 18: band data 2 - always 0 */ + send_0_byte(isa, on); /* 19: time base - always 0 */ + + send_0_byte(isa, on); /* 20: spacing (0 = 25 kHz) */ + send_1_byte(isa, on); /* 21: spacing (1 = 25 kHz) */ + send_0_byte(isa, on); /* 22: spacing (0 = 25 kHz) */ + send_1_byte(isa, on); /* 23: AM/FM (FM = 1, always) */ + + outb(0xd0 + on, isa->io); /* volume steady + sigstr */ + 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++) + udelay(3000); + } else if (curvol > vol) { + outb(0x58, isa->io); /* volume down + sigstr + on */ + for (; curvol > vol; curvol--) + udelay(3000); + } + 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); |