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249 lines
6.3 KiB
249 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Zoltrix Radio Plus driver |
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* Copyright 1998 C. van Schaik <[email protected]> |
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* |
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* BUGS |
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* Due to the inconsistency in reading from the signal flags |
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* it is difficult to get an accurate tuned signal. |
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* |
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* It seems that the card is not linear to 0 volume. It cuts off |
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* at a low volume, and it is not possible (at least I have not found) |
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* to get fine volume control over the low volume range. |
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* |
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* Some code derived from code by Romolo Manfredini |
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* [email protected] |
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* |
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* 1999-05-06 - (C. van Schaik) |
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* - Make signal strength and stereo scans |
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* kinder to cpu while in delay |
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* 1999-01-05 - (C. van Schaik) |
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* - Changed tuning to 1/160Mhz accuracy |
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* - Added stereo support |
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* (card defaults to stereo) |
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* (can explicitly force mono on the card) |
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* (can detect if station is in stereo) |
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* - Added unmute function |
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* - Reworked ioctl functions |
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* 2002-07-15 - Fix Stereo typo |
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* |
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* 2006-07-24 - Converted to V4L2 API |
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* by Mauro Carvalho Chehab <[email protected]> |
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* |
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* Converted to the radio-isa framework by Hans Verkuil <[email protected]> |
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* |
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* Note that this is the driver for the Zoltrix Radio Plus. |
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* This driver does not work for the Zoltrix Radio Plus 108 or the |
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* Zoltrix Radio Plus for Windows. |
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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, msleep */ |
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#include <linux/videodev2.h> /* kernel radio structs */ |
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#include <linux/mutex.h> |
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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 "radio-isa.h" |
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MODULE_AUTHOR("C. van Schaik"); |
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MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus."); |
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MODULE_LICENSE("GPL"); |
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MODULE_VERSION("0.1.99"); |
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#ifndef CONFIG_RADIO_ZOLTRIX_PORT |
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#define CONFIG_RADIO_ZOLTRIX_PORT -1 |
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#endif |
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#define ZOLTRIX_MAX 2 |
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static int io[ZOLTRIX_MAX] = { [0] = CONFIG_RADIO_ZOLTRIX_PORT, |
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[1 ... (ZOLTRIX_MAX - 1)] = -1 }; |
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static int radio_nr[ZOLTRIX_MAX] = { [0 ... (ZOLTRIX_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 Zoltrix Radio Plus card (0x20c or 0x30c)"); |
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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 zoltrix { |
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struct radio_isa_card isa; |
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int curvol; |
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bool muted; |
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}; |
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static struct radio_isa_card *zoltrix_alloc(void) |
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{ |
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struct zoltrix *zol = kzalloc(sizeof(*zol), GFP_KERNEL); |
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return zol ? &zol->isa : NULL; |
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} |
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static int zoltrix_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) |
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{ |
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
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zol->curvol = vol; |
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zol->muted = mute; |
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if (mute || vol == 0) { |
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outb(0, isa->io); |
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outb(0, isa->io); |
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inb(isa->io + 3); /* Zoltrix needs to be read to confirm */ |
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return 0; |
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} |
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outb(vol - 1, isa->io); |
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msleep(10); |
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inb(isa->io + 2); |
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return 0; |
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} |
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/* tunes the radio to the desired frequency */ |
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static int zoltrix_s_frequency(struct radio_isa_card *isa, u32 freq) |
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{ |
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
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struct v4l2_device *v4l2_dev = &isa->v4l2_dev; |
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unsigned long long bitmask, f, m; |
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bool stereo = isa->stereo; |
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int i; |
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if (freq == 0) { |
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v4l2_warn(v4l2_dev, "cannot set a frequency of 0.\n"); |
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return -EINVAL; |
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} |
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m = (freq / 160 - 8800) * 2; |
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f = (unsigned long long)m + 0x4d1c; |
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bitmask = 0xc480402c10080000ull; |
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i = 45; |
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outb(0, isa->io); |
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outb(0, isa->io); |
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inb(isa->io + 3); /* Zoltrix needs to be read to confirm */ |
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outb(0x40, isa->io); |
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outb(0xc0, isa->io); |
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bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ (stereo << 31)); |
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while (i--) { |
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if ((bitmask & 0x8000000000000000ull) != 0) { |
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outb(0x80, isa->io); |
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udelay(50); |
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outb(0x00, isa->io); |
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udelay(50); |
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outb(0x80, isa->io); |
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udelay(50); |
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} else { |
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outb(0xc0, isa->io); |
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udelay(50); |
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outb(0x40, isa->io); |
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udelay(50); |
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outb(0xc0, isa->io); |
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udelay(50); |
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} |
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bitmask *= 2; |
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} |
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/* termination sequence */ |
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outb(0x80, isa->io); |
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outb(0xc0, isa->io); |
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outb(0x40, isa->io); |
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udelay(1000); |
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inb(isa->io + 2); |
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udelay(1000); |
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return zoltrix_s_mute_volume(isa, zol->muted, zol->curvol); |
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} |
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/* Get signal strength */ |
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static u32 zoltrix_g_rxsubchans(struct radio_isa_card *isa) |
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{ |
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
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int a, b; |
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outb(0x00, isa->io); /* This stuff I found to do nothing */ |
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outb(zol->curvol, isa->io); |
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msleep(20); |
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a = inb(isa->io); |
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msleep(10); |
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b = inb(isa->io); |
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return (a == b && a == 0xcf) ? |
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V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO; |
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} |
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static u32 zoltrix_g_signal(struct radio_isa_card *isa) |
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{ |
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
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int a, b; |
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outb(0x00, isa->io); /* This stuff I found to do nothing */ |
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outb(zol->curvol, isa->io); |
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msleep(20); |
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a = inb(isa->io); |
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msleep(10); |
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b = inb(isa->io); |
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if (a != b) |
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return 0; |
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/* I found this out by playing with a binary scanner on the card io */ |
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return (a == 0xcf || a == 0xdf || a == 0xef) ? 0xffff : 0; |
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} |
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static int zoltrix_s_stereo(struct radio_isa_card *isa, bool stereo) |
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{ |
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return zoltrix_s_frequency(isa, isa->freq); |
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} |
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static const struct radio_isa_ops zoltrix_ops = { |
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.alloc = zoltrix_alloc, |
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.s_mute_volume = zoltrix_s_mute_volume, |
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.s_frequency = zoltrix_s_frequency, |
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.s_stereo = zoltrix_s_stereo, |
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.g_rxsubchans = zoltrix_g_rxsubchans, |
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.g_signal = zoltrix_g_signal, |
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}; |
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static const int zoltrix_ioports[] = { 0x20c, 0x30c }; |
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static struct radio_isa_driver zoltrix_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-zoltrix", |
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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 = zoltrix_ioports, |
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.num_of_io_ports = ARRAY_SIZE(zoltrix_ioports), |
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.region_size = 2, |
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.card = "Zoltrix Radio Plus", |
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.ops = &zoltrix_ops, |
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.has_stereo = true, |
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.max_volume = 15, |
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}; |
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static int __init zoltrix_init(void) |
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{ |
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return isa_register_driver(&zoltrix_driver.driver, ZOLTRIX_MAX); |
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} |
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static void __exit zoltrix_exit(void) |
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{ |
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isa_unregister_driver(&zoltrix_driver.driver); |
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} |
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module_init(zoltrix_init); |
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module_exit(zoltrix_exit); |
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