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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/media/radio/radio-cadet.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/media/radio/radio-cadet.c')
-rw-r--r-- | drivers/media/radio/radio-cadet.c | 679 |
1 files changed, 679 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-cadet.c b/drivers/media/radio/radio-cadet.c new file mode 100644 index 000000000..a5db9b4dc --- /dev/null +++ b/drivers/media/radio/radio-cadet.c @@ -0,0 +1,679 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card + * + * by Fred Gleason <fredg@wava.com> + * Version 0.3.3 + * + * (Loosely) based on code for the Aztech radio card by + * + * Russell Kroll (rkroll@exploits.org) + * 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) + * + * History: + * 2000-04-29 Russell Kroll <rkroll@exploits.org> + * Added ISAPnP detection for Linux 2.3/2.4 + * + * 2001-01-10 Russell Kroll <rkroll@exploits.org> + * Removed dead CONFIG_RADIO_CADET_PORT code + * PnP detection on load is now default (no args necessary) + * + * 2002-01-17 Adam Belay <ambx1@neo.rr.com> + * Updated to latest pnp code + * + * 2003-01-31 Alan Cox <alan@lxorguk.ukuu.org.uk> + * Cleaned up locking, delay code, general odds and ends + * + * 2006-07-30 Hans J. Koch <koch@hjk-az.de> + * Changed API to V4L2 + */ + +#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> /* V4L2 API defs */ +#include <linux/param.h> +#include <linux/pnp.h> +#include <linux/sched.h> +#include <linux/io.h> /* outb, outb_p */ +#include <media/v4l2-device.h> +#include <media/v4l2-ioctl.h> +#include <media/v4l2-ctrls.h> +#include <media/v4l2-fh.h> +#include <media/v4l2-event.h> + +MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath"); +MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card."); +MODULE_LICENSE("GPL"); +MODULE_VERSION("0.3.4"); + +static int io = -1; /* default to isapnp activation */ +static int radio_nr = -1; + +module_param(io, int, 0); +MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)"); +module_param(radio_nr, int, 0); + +#define RDS_BUFFER 256 +#define RDS_RX_FLAG 1 +#define MBS_RX_FLAG 2 + +struct cadet { + struct v4l2_device v4l2_dev; + struct video_device vdev; + struct v4l2_ctrl_handler ctrl_handler; + int io; + bool is_fm_band; + u32 curfreq; + int tunestat; + int sigstrength; + wait_queue_head_t read_queue; + struct timer_list readtimer; + u8 rdsin, rdsout, rdsstat; + unsigned char rdsbuf[RDS_BUFFER]; + struct mutex lock; + int reading; +}; + +static struct cadet cadet_card; + +/* + * Signal Strength Threshold Values + * The V4L API spec does not define any particular unit for the signal + * strength value. These values are in microvolts of RF at the tuner's input. + */ +static u16 sigtable[2][4] = { + { 1835, 2621, 4128, 65535 }, + { 2185, 4369, 13107, 65535 }, +}; + +static const struct v4l2_frequency_band bands[] = { + { + .index = 0, + .type = V4L2_TUNER_RADIO, + .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS, + .rangelow = 8320, /* 520 kHz */ + .rangehigh = 26400, /* 1650 kHz */ + .modulation = V4L2_BAND_MODULATION_AM, + }, { + .index = 1, + .type = V4L2_TUNER_RADIO, + .capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS | + V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW | + V4L2_TUNER_CAP_FREQ_BANDS, + .rangelow = 1400000, /* 87.5 MHz */ + .rangehigh = 1728000, /* 108.0 MHz */ + .modulation = V4L2_BAND_MODULATION_FM, + }, +}; + + +static int cadet_getstereo(struct cadet *dev) +{ + int ret = V4L2_TUNER_SUB_MONO; + + if (!dev->is_fm_band) /* Only FM has stereo capability! */ + return V4L2_TUNER_SUB_MONO; + + outb(7, dev->io); /* Select tuner control */ + if ((inb(dev->io + 1) & 0x40) == 0) + ret = V4L2_TUNER_SUB_STEREO; + return ret; +} + +static unsigned cadet_gettune(struct cadet *dev) +{ + int curvol, i; + unsigned fifo = 0; + + /* + * Prepare for read + */ + + outb(7, dev->io); /* Select tuner control */ + curvol = inb(dev->io + 1); /* Save current volume/mute setting */ + outb(0x00, dev->io + 1); /* Ensure WRITE-ENABLE is LOW */ + dev->tunestat = 0xffff; + + /* + * Read the shift register + */ + for (i = 0; i < 25; i++) { + fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01); + if (i < 24) { + outb(0x01, dev->io + 1); + dev->tunestat &= inb(dev->io + 1); + outb(0x00, dev->io + 1); + } + } + + /* + * Restore volume/mute setting + */ + outb(curvol, dev->io + 1); + return fifo; +} + +static unsigned cadet_getfreq(struct cadet *dev) +{ + int i; + unsigned freq = 0, test, fifo = 0; + + /* + * Read current tuning + */ + fifo = cadet_gettune(dev); + + /* + * Convert to actual frequency + */ + if (!dev->is_fm_band) /* AM */ + return ((fifo & 0x7fff) - 450) * 16; + + test = 12500; + for (i = 0; i < 14; i++) { + if ((fifo & 0x01) != 0) + freq += test; + test = test << 1; + fifo = fifo >> 1; + } + freq -= 10700000; /* IF frequency is 10.7 MHz */ + freq = (freq * 16) / 1000; /* Make it 1/16 kHz */ + return freq; +} + +static void cadet_settune(struct cadet *dev, unsigned fifo) +{ + int i; + unsigned test; + + outb(7, dev->io); /* Select tuner control */ + /* + * Write the shift register + */ + test = 0; + test = (fifo >> 23) & 0x02; /* Align data for SDO */ + test |= 0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */ + outb(7, dev->io); /* Select tuner control */ + outb(test, dev->io + 1); /* Initialize for write */ + for (i = 0; i < 25; i++) { + test |= 0x01; /* Toggle SCK High */ + outb(test, dev->io + 1); + test &= 0xfe; /* Toggle SCK Low */ + outb(test, dev->io + 1); + fifo = fifo << 1; /* Prepare the next bit */ + test = 0x1c | ((fifo >> 23) & 0x02); + outb(test, dev->io + 1); + } +} + +static void cadet_setfreq(struct cadet *dev, unsigned freq) +{ + unsigned fifo; + int i, j, test; + int curvol; + + freq = clamp(freq, bands[dev->is_fm_band].rangelow, + bands[dev->is_fm_band].rangehigh); + dev->curfreq = freq; + /* + * Formulate a fifo command + */ + fifo = 0; + if (dev->is_fm_band) { /* FM */ + test = 102400; + freq = freq / 16; /* Make it kHz */ + freq += 10700; /* IF is 10700 kHz */ + for (i = 0; i < 14; i++) { + fifo = fifo << 1; + if (freq >= test) { + fifo |= 0x01; + freq -= test; + } + test = test >> 1; + } + } else { /* AM */ + fifo = (freq / 16) + 450; /* Make it kHz */ + fifo |= 0x100000; /* Select AM Band */ + } + + /* + * Save current volume/mute setting + */ + + outb(7, dev->io); /* Select tuner control */ + curvol = inb(dev->io + 1); + + /* + * Tune the card + */ + for (j = 3; j > -1; j--) { + cadet_settune(dev, fifo | (j << 16)); + + outb(7, dev->io); /* Select tuner control */ + outb(curvol, dev->io + 1); + + msleep(100); + + cadet_gettune(dev); + if ((dev->tunestat & 0x40) == 0) { /* Tuned */ + dev->sigstrength = sigtable[dev->is_fm_band][j]; + goto reset_rds; + } + } + dev->sigstrength = 0; +reset_rds: + outb(3, dev->io); + outb(inb(dev->io + 1) & 0x7f, dev->io + 1); +} + +static bool cadet_has_rds_data(struct cadet *dev) +{ + bool result; + + mutex_lock(&dev->lock); + result = dev->rdsin != dev->rdsout; + mutex_unlock(&dev->lock); + return result; +} + + +static void cadet_handler(struct timer_list *t) +{ + struct cadet *dev = from_timer(dev, t, readtimer); + + /* Service the RDS fifo */ + if (mutex_trylock(&dev->lock)) { + outb(0x3, dev->io); /* Select RDS Decoder Control */ + if ((inb(dev->io + 1) & 0x20) != 0) + pr_err("cadet: RDS fifo overflow\n"); + outb(0x80, dev->io); /* Select RDS fifo */ + + while ((inb(dev->io) & 0x80) != 0) { + dev->rdsbuf[dev->rdsin] = inb(dev->io + 1); + if (dev->rdsin + 1 != dev->rdsout) + dev->rdsin++; + } + mutex_unlock(&dev->lock); + } + + /* + * Service pending read + */ + if (cadet_has_rds_data(dev)) + wake_up_interruptible(&dev->read_queue); + + /* + * Clean up and exit + */ + dev->readtimer.expires = jiffies + msecs_to_jiffies(50); + add_timer(&dev->readtimer); +} + +static void cadet_start_rds(struct cadet *dev) +{ + dev->rdsstat = 1; + outb(0x80, dev->io); /* Select RDS fifo */ + timer_setup(&dev->readtimer, cadet_handler, 0); + dev->readtimer.expires = jiffies + msecs_to_jiffies(50); + add_timer(&dev->readtimer); +} + +static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos) +{ + struct cadet *dev = video_drvdata(file); + unsigned char readbuf[RDS_BUFFER]; + int i = 0; + + mutex_lock(&dev->lock); + if (dev->rdsstat == 0) + cadet_start_rds(dev); + mutex_unlock(&dev->lock); + + if (!cadet_has_rds_data(dev) && (file->f_flags & O_NONBLOCK)) + return -EWOULDBLOCK; + i = wait_event_interruptible(dev->read_queue, cadet_has_rds_data(dev)); + if (i) + return i; + + mutex_lock(&dev->lock); + while (i < count && dev->rdsin != dev->rdsout) + readbuf[i++] = dev->rdsbuf[dev->rdsout++]; + mutex_unlock(&dev->lock); + + if (i && copy_to_user(data, readbuf, i)) + return -EFAULT; + return i; +} + + +static int vidioc_querycap(struct file *file, void *priv, + struct v4l2_capability *v) +{ + strscpy(v->driver, "ADS Cadet", sizeof(v->driver)); + strscpy(v->card, "ADS Cadet", sizeof(v->card)); + strscpy(v->bus_info, "ISA:radio-cadet", sizeof(v->bus_info)); + return 0; +} + +static int vidioc_g_tuner(struct file *file, void *priv, + struct v4l2_tuner *v) +{ + struct cadet *dev = video_drvdata(file); + + if (v->index) + return -EINVAL; + v->type = V4L2_TUNER_RADIO; + strscpy(v->name, "Radio", sizeof(v->name)); + v->capability = bands[0].capability | bands[1].capability; + v->rangelow = bands[0].rangelow; /* 520 kHz (start of AM band) */ + v->rangehigh = bands[1].rangehigh; /* 108.0 MHz (end of FM band) */ + if (dev->is_fm_band) { + v->rxsubchans = cadet_getstereo(dev); + outb(3, dev->io); + outb(inb(dev->io + 1) & 0x7f, dev->io + 1); + mdelay(100); + outb(3, dev->io); + if (inb(dev->io + 1) & 0x80) + v->rxsubchans |= V4L2_TUNER_SUB_RDS; + } else { + v->rangelow = 8320; /* 520 kHz */ + v->rangehigh = 26400; /* 1650 kHz */ + v->rxsubchans = V4L2_TUNER_SUB_MONO; + } + v->audmode = V4L2_TUNER_MODE_STEREO; + v->signal = dev->sigstrength; /* We might need to modify scaling of this */ + return 0; +} + +static int vidioc_s_tuner(struct file *file, void *priv, + const struct v4l2_tuner *v) +{ + return v->index ? -EINVAL : 0; +} + +static int vidioc_enum_freq_bands(struct file *file, void *priv, + struct v4l2_frequency_band *band) +{ + if (band->tuner) + return -EINVAL; + if (band->index >= ARRAY_SIZE(bands)) + return -EINVAL; + *band = bands[band->index]; + return 0; +} + +static int vidioc_g_frequency(struct file *file, void *priv, + struct v4l2_frequency *f) +{ + struct cadet *dev = video_drvdata(file); + + if (f->tuner) + return -EINVAL; + f->type = V4L2_TUNER_RADIO; + f->frequency = dev->curfreq; + return 0; +} + + +static int vidioc_s_frequency(struct file *file, void *priv, + const struct v4l2_frequency *f) +{ + struct cadet *dev = video_drvdata(file); + + if (f->tuner) + return -EINVAL; + dev->is_fm_band = + f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2; + cadet_setfreq(dev, f->frequency); + return 0; +} + +static int cadet_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + outb(7, dev->io); /* Select tuner control */ + if (ctrl->val) + outb(0x00, dev->io + 1); + else + outb(0x20, dev->io + 1); + return 0; + } + return -EINVAL; +} + +static int cadet_open(struct file *file) +{ + struct cadet *dev = video_drvdata(file); + int err; + + mutex_lock(&dev->lock); + err = v4l2_fh_open(file); + if (err) + goto fail; + if (v4l2_fh_is_singular_file(file)) + init_waitqueue_head(&dev->read_queue); +fail: + mutex_unlock(&dev->lock); + return err; +} + +static int cadet_release(struct file *file) +{ + struct cadet *dev = video_drvdata(file); + + mutex_lock(&dev->lock); + if (v4l2_fh_is_singular_file(file) && dev->rdsstat) { + del_timer_sync(&dev->readtimer); + dev->rdsstat = 0; + } + v4l2_fh_release(file); + mutex_unlock(&dev->lock); + return 0; +} + +static __poll_t cadet_poll(struct file *file, struct poll_table_struct *wait) +{ + struct cadet *dev = video_drvdata(file); + __poll_t req_events = poll_requested_events(wait); + __poll_t res = v4l2_ctrl_poll(file, wait); + + poll_wait(file, &dev->read_queue, wait); + if (dev->rdsstat == 0 && (req_events & (EPOLLIN | EPOLLRDNORM))) { + mutex_lock(&dev->lock); + if (dev->rdsstat == 0) + cadet_start_rds(dev); + mutex_unlock(&dev->lock); + } + if (cadet_has_rds_data(dev)) + res |= EPOLLIN | EPOLLRDNORM; + return res; +} + + +static const struct v4l2_file_operations cadet_fops = { + .owner = THIS_MODULE, + .open = cadet_open, + .release = cadet_release, + .read = cadet_read, + .unlocked_ioctl = video_ioctl2, + .poll = cadet_poll, +}; + +static const struct v4l2_ioctl_ops cadet_ioctl_ops = { + .vidioc_querycap = vidioc_querycap, + .vidioc_g_tuner = vidioc_g_tuner, + .vidioc_s_tuner = vidioc_s_tuner, + .vidioc_g_frequency = vidioc_g_frequency, + .vidioc_s_frequency = vidioc_s_frequency, + .vidioc_enum_freq_bands = vidioc_enum_freq_bands, + .vidioc_log_status = v4l2_ctrl_log_status, + .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, + .vidioc_unsubscribe_event = v4l2_event_unsubscribe, +}; + +static const struct v4l2_ctrl_ops cadet_ctrl_ops = { + .s_ctrl = cadet_s_ctrl, +}; + +#ifdef CONFIG_PNP + +static const struct pnp_device_id cadet_pnp_devices[] = { + /* ADS Cadet AM/FM Radio Card */ + {.id = "MSM0c24", .driver_data = 0}, + {.id = ""} +}; + +MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices); + +static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) +{ + if (!dev) + return -ENODEV; + /* only support one device */ + if (io > 0) + return -EBUSY; + + if (!pnp_port_valid(dev, 0)) + return -ENODEV; + + io = pnp_port_start(dev, 0); + + printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io); + + return io; +} + +static struct pnp_driver cadet_pnp_driver = { + .name = "radio-cadet", + .id_table = cadet_pnp_devices, + .probe = cadet_pnp_probe, + .remove = NULL, +}; + +#else +static struct pnp_driver cadet_pnp_driver; +#endif + +static void cadet_probe(struct cadet *dev) +{ + static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e }; + int i; + + for (i = 0; i < 8; i++) { + dev->io = iovals[i]; + if (request_region(dev->io, 2, "cadet-probe")) { + cadet_setfreq(dev, bands[1].rangelow); + if (cadet_getfreq(dev) == bands[1].rangelow) { + release_region(dev->io, 2); + return; + } + release_region(dev->io, 2); + } + } + dev->io = -1; +} + +/* + * io should only be set if the user has used something like + * isapnp (the userspace program) to initialize this card for us + */ + +static int __init cadet_init(void) +{ + struct cadet *dev = &cadet_card; + struct v4l2_device *v4l2_dev = &dev->v4l2_dev; + struct v4l2_ctrl_handler *hdl; + int res = -ENODEV; + + strscpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name)); + mutex_init(&dev->lock); + + /* If a probe was requested then probe ISAPnP first (safest) */ + if (io < 0) + pnp_register_driver(&cadet_pnp_driver); + dev->io = io; + + /* If that fails then probe unsafely if probe is requested */ + if (dev->io < 0) + cadet_probe(dev); + + /* Else we bail out */ + if (dev->io < 0) { +#ifdef MODULE + v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n"); + v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n"); +#endif + goto fail; + } + if (!request_region(dev->io, 2, "cadet")) + goto fail; + + res = v4l2_device_register(NULL, v4l2_dev); + if (res < 0) { + release_region(dev->io, 2); + v4l2_err(v4l2_dev, "could not register v4l2_device\n"); + goto fail; + } + + hdl = &dev->ctrl_handler; + v4l2_ctrl_handler_init(hdl, 2); + v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops, + V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1); + v4l2_dev->ctrl_handler = hdl; + if (hdl->error) { + res = hdl->error; + v4l2_err(v4l2_dev, "Could not register controls\n"); + goto err_hdl; + } + + dev->is_fm_band = true; + dev->curfreq = bands[dev->is_fm_band].rangelow; + cadet_setfreq(dev, dev->curfreq); + strscpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name)); + dev->vdev.v4l2_dev = v4l2_dev; + dev->vdev.fops = &cadet_fops; + dev->vdev.ioctl_ops = &cadet_ioctl_ops; + dev->vdev.release = video_device_release_empty; + dev->vdev.lock = &dev->lock; + dev->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO | + V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE; + video_set_drvdata(&dev->vdev, dev); + + res = video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr); + if (res < 0) + goto err_hdl; + v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io); + return 0; +err_hdl: + v4l2_ctrl_handler_free(hdl); + v4l2_device_unregister(v4l2_dev); + release_region(dev->io, 2); +fail: + pnp_unregister_driver(&cadet_pnp_driver); + return res; +} + +static void __exit cadet_exit(void) +{ + struct cadet *dev = &cadet_card; + + video_unregister_device(&dev->vdev); + v4l2_ctrl_handler_free(&dev->ctrl_handler); + v4l2_device_unregister(&dev->v4l2_dev); + outb(7, dev->io); /* Mute */ + outb(0x00, dev->io + 1); + release_region(dev->io, 2); + pnp_unregister_driver(&cadet_pnp_driver); +} + +module_init(cadet_init); +module_exit(cadet_exit); + |