diff options
Diffstat (limited to 'drivers/media/radio/radio-typhoon.c')
-rw-r--r-- | drivers/media/radio/radio-typhoon.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-typhoon.c b/drivers/media/radio/radio-typhoon.c new file mode 100644 index 0000000..952ec35 --- /dev/null +++ b/drivers/media/radio/radio-typhoon.c @@ -0,0 +1,491 @@ +/* Typhoon Radio Card driver for radio support + * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de> + * + * Card manufacturer: + * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e + * + * Notes on the hardware + * + * This card has two output sockets, one for speakers and one for line. + * The speaker output has volume control, but only in four discrete + * steps. The line output has neither volume control nor mute. + * + * The card has auto-stereo according to its manual, although it all + * sounds mono to me (even with the Win/DOS drivers). Maybe it's my + * antenna - I really don't know for sure. + * + * Frequency control is done digitally. + * + * Volume control is done digitally, but there are only four different + * possible values. So you should better always turn the volume up and + * use line control. I got the best results by connecting line output + * to the sound card microphone input. For such a configuration the + * volume control has no effect, since volume control only influences + * the speaker output. + * + * There is no explicit mute/unmute. So I set the radio frequency to a + * value where I do expect just noise and turn the speaker volume down. + * The frequency change is necessary since the card never seems to be + * completely silent. + * + * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> + */ + +#include <linux/module.h> /* Modules */ +#include <linux/init.h> /* Initdata */ +#include <linux/ioport.h> /* request_region */ +#include <linux/proc_fs.h> /* radio card status report */ +#include <linux/seq_file.h> +#include <asm/io.h> /* outb, outb_p */ +#include <asm/uaccess.h> /* copy to/from user */ +#include <linux/videodev2.h> /* kernel radio structs */ +#include <media/v4l2-common.h> +#include <media/v4l2-ioctl.h> + +#include <linux/version.h> /* for KERNEL_VERSION MACRO */ +#define RADIO_VERSION KERNEL_VERSION(0,1,1) +#define BANNER "Typhoon Radio Card driver v0.1.1\n" + +static struct v4l2_queryctrl radio_qctrl[] = { + { + .id = V4L2_CID_AUDIO_MUTE, + .name = "Mute", + .minimum = 0, + .maximum = 1, + .default_value = 1, + .type = V4L2_CTRL_TYPE_BOOLEAN, + },{ + .id = V4L2_CID_AUDIO_VOLUME, + .name = "Volume", + .minimum = 0, + .maximum = 65535, + .step = 1<<14, + .default_value = 0xff, + .type = V4L2_CTRL_TYPE_INTEGER, + } +}; + + +#ifndef CONFIG_RADIO_TYPHOON_PORT +#define CONFIG_RADIO_TYPHOON_PORT -1 +#endif + +#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ +#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0 +#endif + +#ifndef CONFIG_PROC_FS +#undef CONFIG_RADIO_TYPHOON_PROC_FS +#endif + +struct typhoon_device { + unsigned long in_use; + int iobase; + int curvol; + int muted; + unsigned long curfreq; + unsigned long mutefreq; + struct mutex lock; +}; + +static void typhoon_setvol_generic(struct typhoon_device *dev, int vol); +static int typhoon_setfreq_generic(struct typhoon_device *dev, + unsigned long frequency); +static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency); +static void typhoon_mute(struct typhoon_device *dev); +static void typhoon_unmute(struct typhoon_device *dev); +static int typhoon_setvol(struct typhoon_device *dev, int vol); + +static void typhoon_setvol_generic(struct typhoon_device *dev, int vol) +{ + mutex_lock(&dev->lock); + vol >>= 14; /* Map 16 bit to 2 bit */ + vol &= 3; + outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */ + outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */ + mutex_unlock(&dev->lock); +} + +static int typhoon_setfreq_generic(struct typhoon_device *dev, + unsigned long frequency) +{ + unsigned long outval; + unsigned long x; + + /* + * The frequency transfer curve is not linear. The best fit I could + * get is + * + * outval = -155 + exp((f + 15.55) * 0.057)) + * + * where frequency f is in MHz. Since we don't have exp in the kernel, + * I approximate this function by a third order polynomial. + * + */ + + mutex_lock(&dev->lock); + x = frequency / 160; + outval = (x * x + 2500) / 5000; + outval = (outval * x + 5000) / 10000; + outval -= (10 * x * x + 10433) / 20866; + outval += 4 * x - 11505; + + outb_p((outval >> 8) & 0x01, dev->iobase + 4); + outb_p(outval >> 9, dev->iobase + 6); + outb_p(outval & 0xff, dev->iobase + 8); + mutex_unlock(&dev->lock); + + return 0; +} + +static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency) +{ + typhoon_setfreq_generic(dev, frequency); + dev->curfreq = frequency; + return 0; +} + +static void typhoon_mute(struct typhoon_device *dev) +{ + if (dev->muted == 1) + return; + typhoon_setvol_generic(dev, 0); + typhoon_setfreq_generic(dev, dev->mutefreq); + dev->muted = 1; +} + +static void typhoon_unmute(struct typhoon_device *dev) +{ + if (dev->muted == 0) + return; + typhoon_setfreq_generic(dev, dev->curfreq); + typhoon_setvol_generic(dev, dev->curvol); + dev->muted = 0; +} + +static int typhoon_setvol(struct typhoon_device *dev, int vol) +{ + if (dev->muted && vol != 0) { /* user is unmuting the card */ + dev->curvol = vol; + typhoon_unmute(dev); + return 0; + } + if (vol == dev->curvol) /* requested volume == current */ + return 0; + + if (vol == 0) { /* volume == 0 means mute the card */ + typhoon_mute(dev); + dev->curvol = vol; + return 0; + } + typhoon_setvol_generic(dev, vol); + dev->curvol = vol; + return 0; +} + +static int vidioc_querycap(struct file *file, void *priv, + struct v4l2_capability *v) +{ + strlcpy(v->driver, "radio-typhoon", sizeof(v->driver)); + strlcpy(v->card, "Typhoon Radio", sizeof(v->card)); + sprintf(v->bus_info, "ISA"); + v->version = RADIO_VERSION; + v->capabilities = V4L2_CAP_TUNER; + return 0; +} + +static int vidioc_g_tuner(struct file *file, void *priv, + struct v4l2_tuner *v) +{ + if (v->index > 0) + return -EINVAL; + + strcpy(v->name, "FM"); + v->type = V4L2_TUNER_RADIO; + v->rangelow = (87.5*16000); + v->rangehigh = (108*16000); + v->rxsubchans = V4L2_TUNER_SUB_MONO; + v->capability = V4L2_TUNER_CAP_LOW; + v->audmode = V4L2_TUNER_MODE_MONO; + v->signal = 0xFFFF; /* We can't get the signal strength */ + return 0; +} + +static int vidioc_s_tuner(struct file *file, void *priv, + struct v4l2_tuner *v) +{ + if (v->index > 0) + return -EINVAL; + + return 0; +} + +static int vidioc_s_frequency(struct file *file, void *priv, + struct v4l2_frequency *f) +{ + struct typhoon_device *typhoon = video_drvdata(file); + + typhoon->curfreq = f->frequency; + typhoon_setfreq(typhoon, typhoon->curfreq); + return 0; +} + +static int vidioc_g_frequency(struct file *file, void *priv, + struct v4l2_frequency *f) +{ + struct typhoon_device *typhoon = video_drvdata(file); + + f->type = V4L2_TUNER_RADIO; + f->frequency = typhoon->curfreq; + + return 0; +} + +static int vidioc_queryctrl(struct file *file, void *priv, + struct v4l2_queryctrl *qc) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { + if (qc->id && qc->id == radio_qctrl[i].id) { + memcpy(qc, &(radio_qctrl[i]), + sizeof(*qc)); + return 0; + } + } + return -EINVAL; +} + +static int vidioc_g_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct typhoon_device *typhoon = video_drvdata(file); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + ctrl->value = typhoon->muted; + return 0; + case V4L2_CID_AUDIO_VOLUME: + ctrl->value = typhoon->curvol; + return 0; + } + return -EINVAL; +} + +static int vidioc_s_ctrl (struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct typhoon_device *typhoon = video_drvdata(file); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + if (ctrl->value) + typhoon_mute(typhoon); + else + typhoon_unmute(typhoon); + return 0; + case V4L2_CID_AUDIO_VOLUME: + typhoon_setvol(typhoon, ctrl->value); + return 0; + } + return -EINVAL; +} + +static int vidioc_g_audio(struct file *file, void *priv, + struct v4l2_audio *a) +{ + if (a->index > 1) + return -EINVAL; + + strcpy(a->name, "Radio"); + a->capability = V4L2_AUDCAP_STEREO; + return 0; +} + +static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) +{ + *i = 0; + return 0; +} + +static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) +{ + if (i != 0) + return -EINVAL; + return 0; +} + +static int vidioc_s_audio(struct file *file, void *priv, + struct v4l2_audio *a) +{ + if (a->index != 0) + return -EINVAL; + return 0; +} + +static struct typhoon_device typhoon_unit = +{ + .iobase = CONFIG_RADIO_TYPHOON_PORT, + .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, + .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ, +}; + +static int typhoon_exclusive_open(struct inode *inode, struct file *file) +{ + return test_and_set_bit(0, &typhoon_unit.in_use) ? -EBUSY : 0; +} + +static int typhoon_exclusive_release(struct inode *inode, struct file *file) +{ + clear_bit(0, &typhoon_unit.in_use); + return 0; +} + +static const struct file_operations typhoon_fops = { + .owner = THIS_MODULE, + .open = typhoon_exclusive_open, + .release = typhoon_exclusive_release, + .ioctl = video_ioctl2, +#ifdef CONFIG_COMPAT + .compat_ioctl = v4l_compat_ioctl32, +#endif + .llseek = no_llseek, +}; + +static const struct v4l2_ioctl_ops typhoon_ioctl_ops = { + .vidioc_querycap = vidioc_querycap, + .vidioc_g_tuner = vidioc_g_tuner, + .vidioc_s_tuner = vidioc_s_tuner, + .vidioc_g_audio = vidioc_g_audio, + .vidioc_s_audio = vidioc_s_audio, + .vidioc_g_input = vidioc_g_input, + .vidioc_s_input = vidioc_s_input, + .vidioc_g_frequency = vidioc_g_frequency, + .vidioc_s_frequency = vidioc_s_frequency, + .vidioc_queryctrl = vidioc_queryctrl, + .vidioc_g_ctrl = vidioc_g_ctrl, + .vidioc_s_ctrl = vidioc_s_ctrl, +}; + +static struct video_device typhoon_radio = { + .name = "Typhoon Radio", + .fops = &typhoon_fops, + .ioctl_ops = &typhoon_ioctl_ops, + .release = video_device_release_empty, +}; + +#ifdef CONFIG_RADIO_TYPHOON_PROC_FS + +static int typhoon_proc_show(struct seq_file *m, void *v) +{ + #ifdef MODULE + #define MODULEPROCSTRING "Driver loaded as a module" + #else + #define MODULEPROCSTRING "Driver compiled into kernel" + #endif + + seq_puts(m, BANNER); + seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n"); + seq_printf(m, "frequency = %lu kHz\n", + typhoon_unit.curfreq >> 4); + seq_printf(m, "volume = %d\n", typhoon_unit.curvol); + seq_printf(m, "mute = %s\n", typhoon_unit.muted ? + "on" : "off"); + seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase); + seq_printf(m, "mute frequency = %lu kHz\n", + typhoon_unit.mutefreq >> 4); + return 0; +} + +static int typhoon_proc_open(struct inode *inode, struct file *file) +{ + return single_open(file, typhoon_proc_show, NULL); +} + +static const struct file_operations typhoon_proc_fops = { + .owner = THIS_MODULE, + .open = typhoon_proc_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; +#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */ + +MODULE_AUTHOR("Dr. Henrik Seidel"); +MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); +MODULE_LICENSE("GPL"); + +static int io = -1; +static int radio_nr = -1; + +module_param(io, int, 0); +MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); +module_param(radio_nr, int, 0); + +#ifdef MODULE +static unsigned long mutefreq; +module_param(mutefreq, ulong, 0); +MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); +#endif + +static int __init typhoon_init(void) +{ +#ifdef MODULE + if (io == -1) { + printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n"); + return -EINVAL; + } + typhoon_unit.iobase = io; + + if (mutefreq < 87000 || mutefreq > 108500) { + printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n"); + printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); + return -EINVAL; + } + typhoon_unit.mutefreq = mutefreq; +#endif /* MODULE */ + + printk(KERN_INFO BANNER); + mutex_init(&typhoon_unit.lock); + io = typhoon_unit.iobase; + if (!request_region(io, 8, "typhoon")) { + printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n", + typhoon_unit.iobase); + return -EBUSY; + } + + video_set_drvdata(&typhoon_radio, &typhoon_unit); + if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) < 0) { + release_region(io, 8); + return -EINVAL; + } + printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase); + printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n", + typhoon_unit.mutefreq); + typhoon_unit.mutefreq <<= 4; + + /* mute card - prevents noisy bootups */ + typhoon_mute(&typhoon_unit); + +#ifdef CONFIG_RADIO_TYPHOON_PROC_FS + if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops)) + printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n"); +#endif + + return 0; +} + +static void __exit typhoon_cleanup_module(void) +{ + +#ifdef CONFIG_RADIO_TYPHOON_PROC_FS + remove_proc_entry("driver/radio-typhoon", NULL); +#endif + + video_unregister_device(&typhoon_radio); + release_region(io, 8); +} + +module_init(typhoon_init); +module_exit(typhoon_cleanup_module); + |