/* radio-aztech.c - Aztech radio card driver for Linux 2.2 * * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> * Adapted to support the Video for Linux API by * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by: * * Quay Ly * Donald Song * Jason Lewis (jlewis@twilight.vtc.vsc.edu) * Scott McGrath (smcgrath@twilight.vtc.vsc.edu) * William McGrath (wmcgrath@twilight.vtc.vsc.edu) * * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/ * along with more information on the card itself. * * History: * 1999-02-24 Russell Kroll <rkroll@exploits.org> * Fine tuning/VIDEO_TUNER_LOW * Range expanded to 87-108 MHz (from 87.9-107.8) * * Notable changes from the original source: * - includes stripped down to the essentials * - for loops used as delays replaced with udelay() * - #defines removed, changed to static values * - tuning structure changed - no more character arrays, other changes */ #include <linux/module.h> /* Modules */ #include <linux/init.h> /* Initdata */ #include <linux/ioport.h> /* request_region */ #include <linux/delay.h> /* udelay */ #include <linux/videodev2.h> /* kernel radio structs */ #include <linux/io.h> /* outb, outb_p */ #include <media/v4l2-device.h> #include <media/v4l2-ioctl.h> MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath"); MODULE_DESCRIPTION("A driver for the Aztech radio card."); MODULE_LICENSE("GPL"); MODULE_VERSION("0.0.3"); /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */ #ifndef CONFIG_RADIO_AZTECH_PORT #define CONFIG_RADIO_AZTECH_PORT -1 #endif static int io = CONFIG_RADIO_AZTECH_PORT; static int radio_nr = -1; static int radio_wait_time = 1000; module_param(io, int, 0); module_param(radio_nr, int, 0); MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)"); struct aztech { struct v4l2_device v4l2_dev; struct video_device vdev; int io; int curvol; unsigned long curfreq; int stereo; struct mutex lock; }; static struct aztech aztech_card; static int volconvert(int level) { level >>= 14; /* Map 16bits down to 2 bit */ level &= 3; /* convert to card-friendly values */ switch (level) { case 0: return 0; case 1: return 1; case 2: return 4; case 3: return 5; } return 0; /* Quieten gcc */ } static void send_0_byte(struct aztech *az) { udelay(radio_wait_time); outb_p(2 + volconvert(az->curvol), az->io); outb_p(64 + 2 + volconvert(az->curvol), az->io); } static void send_1_byte(struct aztech *az) { udelay (radio_wait_time); outb_p(128 + 2 + volconvert(az->curvol), az->io); outb_p(128 + 64 + 2 + volconvert(az->curvol), az->io); } static int az_setvol(struct aztech *az, int vol) { mutex_lock(&az->lock); outb(volconvert(vol), az->io); mutex_unlock(&az->lock); return 0; } /* thanks to Michael Dwyer for giving me a dose of clues in * the signal strength department.. * * This card has a stereo bit - bit 0 set = mono, not set = stereo * It also has a "signal" bit - bit 1 set = bad signal, not set = good * */ static int az_getsigstr(struct aztech *az) { int sig = 1; mutex_lock(&az->lock); if (inb(az->io) & 2) /* bit set = no signal present */ sig = 0; mutex_unlock(&az->lock); return sig; } static int az_getstereo(struct aztech *az) { int stereo = 1; mutex_lock(&az->lock); if (inb(az->io) & 1) /* bit set = mono */ stereo = 0; mutex_unlock(&az->lock); return stereo; } static int az_setfreq(struct aztech *az, unsigned long frequency) { int i; mutex_lock(&az->lock); az->curfreq = frequency; frequency += 171200; /* Add 10.7 MHz IF */ frequency /= 800; /* Convert to 50 kHz units */ send_0_byte(az); /* 0: LSB of frequency */ for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ if (frequency & (1 << i)) send_1_byte(az); else send_0_byte(az); send_0_byte(az); /* 14: test bit - always 0 */ send_0_byte(az); /* 15: test bit - always 0 */ send_0_byte(az); /* 16: band data 0 - always 0 */ if (az->stereo) /* 17: stereo (1 to enable) */ send_1_byte(az); else send_0_byte(az); send_1_byte(az); /* 18: band data 1 - unknown */ send_0_byte(az); /* 19: time base - always 0 */ send_0_byte(az); /* 20: spacing (0 = 25 kHz) */ send_1_byte(az); /* 21: spacing (1 = 25 kHz) */ send_0_byte(az); /* 22: spacing (0 = 25 kHz) */ send_1_byte(az); /* 23: AM/FM (FM = 1, always) */ /* latch frequency */ udelay(radio_wait_time); outb_p(128 + 64 + volconvert(az->curvol), az->io); mutex_unlock(&az->lock); return 0; } static int vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *v) { strlcpy(v->driver, "radio-aztech", sizeof(v->driver)); strlcpy(v->card, "Aztech Radio", sizeof(v->card)); strlcpy(v->bus_info, "ISA", sizeof(v->bus_info)); v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO; return 0; } static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v) { struct aztech *az = video_drvdata(file); if (v->index > 0) return -EINVAL; strlcpy(v->name, "FM", sizeof(v->name)); v->type = V4L2_TUNER_RADIO; v->rangelow = 87 * 16000; v->rangehigh = 108 * 16000; v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO; v->capability = V4L2_TUNER_CAP_LOW; if (az_getstereo(az)) v->audmode = V4L2_TUNER_MODE_STEREO; else v->audmode = V4L2_TUNER_MODE_MONO; v->signal = 0xFFFF * az_getsigstr(az); return 0; } static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v) { return v->index ? -EINVAL : 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) { return i ? -EINVAL : 0; } static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a) { a->index = 0; strlcpy(a->name, "Radio", sizeof(a->name)); a->capability = V4L2_AUDCAP_STEREO; return 0; } static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a) { return a->index ? -EINVAL : 0; } static int vidioc_s_frequency(struct file *file, void *priv, struct v4l2_frequency *f) { struct aztech *az = video_drvdata(file); if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO) return -EINVAL; az_setfreq(az, f->frequency); return 0; } static int vidioc_g_frequency(struct file *file, void *priv, struct v4l2_frequency *f) { struct aztech *az = video_drvdata(file); if (f->tuner != 0) return -EINVAL; f->type = V4L2_TUNER_RADIO; f->frequency = az->curfreq; return 0; } static int vidioc_queryctrl(struct file *file, void *priv, struct v4l2_queryctrl *qc) { switch (qc->id) { case V4L2_CID_AUDIO_MUTE: return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); case V4L2_CID_AUDIO_VOLUME: return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff); } return -EINVAL; } static int vidioc_g_ctrl(struct file *file, void *priv, struct v4l2_control *ctrl) { struct aztech *az = video_drvdata(file); switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: if (az->curvol == 0) ctrl->value = 1; else ctrl->value = 0; return 0; case V4L2_CID_AUDIO_VOLUME: ctrl->value = az->curvol * 6554; return 0; } return -EINVAL; } static int vidioc_s_ctrl(struct file *file, void *priv, struct v4l2_control *ctrl) { struct aztech *az = video_drvdata(file); switch (ctrl->id) { case V4L2_CID_AUDIO_MUTE: if (ctrl->value) az_setvol(az, 0); else az_setvol(az, az->curvol); return 0; case V4L2_CID_AUDIO_VOLUME: az_setvol(az, ctrl->value); return 0; } return -EINVAL; } static const struct v4l2_file_operations aztech_fops = { .owner = THIS_MODULE, .unlocked_ioctl = video_ioctl2, }; static const struct v4l2_ioctl_ops aztech_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 int __init aztech_init(void) { struct aztech *az = &aztech_card; struct v4l2_device *v4l2_dev = &az->v4l2_dev; int res; strlcpy(v4l2_dev->name, "aztech", sizeof(v4l2_dev->name)); az->io = io; if (az->io == -1) { v4l2_err(v4l2_dev, "you must set an I/O address with io=0x350 or 0x358\n"); return -EINVAL; } if (!request_region(az->io, 2, "aztech")) { v4l2_err(v4l2_dev, "port 0x%x already in use\n", az->io); return -EBUSY; } res = v4l2_device_register(NULL, v4l2_dev); if (res < 0) { release_region(az->io, 2); v4l2_err(v4l2_dev, "Could not register v4l2_device\n"); return res; } mutex_init(&az->lock); strlcpy(az->vdev.name, v4l2_dev->name, sizeof(az->vdev.name)); az->vdev.v4l2_dev = v4l2_dev; az->vdev.fops = &aztech_fops; az->vdev.ioctl_ops = &aztech_ioctl_ops; az->vdev.release = video_device_release_empty; video_set_drvdata(&az->vdev, az); /* mute card - prevents noisy bootups */ outb(0, az->io); if (video_register_device(&az->vdev, VFL_TYPE_RADIO, radio_nr) < 0) { v4l2_device_unregister(v4l2_dev); release_region(az->io, 2); return -EINVAL; } v4l2_info(v4l2_dev, "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n"); return 0; } static void __exit aztech_exit(void) { struct aztech *az = &aztech_card; video_unregister_device(&az->vdev); v4l2_device_unregister(&az->v4l2_dev); release_region(az->io, 2); } module_init(aztech_init); module_exit(aztech_exit);