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linux/drivers/media/radio/radio-sf16fmi.c
Colin Ian King 2bea838824 media: media/radio: make array probe_ports static const 
Don't populate the read-only array probe_ports on the stack but
instead it static const. Also makes the object code a little smaller.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
2022-01-23 21:18:43 +01:00

383 lines
9.3 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/* SF16-FMI, SF16-FMP and SF16-FMD radio driver for Linux radio support
* heavily based on rtrack driver...
* (c) 1997 M. Kirkwood
* (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
*
* Fitted to new interface by Alan Cox <alan@lxorguk.ukuu.org.uk>
* Made working and cleaned up functions <mikael.hedin@irf.se>
* Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
*
* Notes on the hardware
*
* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
* No volume control - only mute/unmute - you have to use line volume
* control on SB-part of SF16-FMI/SF16-FMP/SF16-FMD
*
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
*/
#include <linux/kernel.h> /* __setup */
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* udelay */
#include <linux/isapnp.h>
#include <linux/mutex.h>
#include <linux/videodev2.h> /* kernel radio structs */
#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-event.h>
#include "lm7000.h"
MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
MODULE_DESCRIPTION("A driver for the SF16-FMI, SF16-FMP and SF16-FMD radio.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.3");
static int io = -1;
static int radio_nr = -1;
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the SF16-FMI/SF16-FMP/SF16-FMD card (0x284 or 0x384)");
module_param(radio_nr, int, 0);
struct fmi
{
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler hdl;
struct video_device vdev;
int io;
bool mute;
u32 curfreq; /* freq in kHz */
struct mutex lock;
};
static struct fmi fmi_card;
static struct pnp_dev *dev;
static bool pnp_attached;
#define RSF16_MINFREQ (87U * 16000)
#define RSF16_MAXFREQ (108U * 16000)
#define FMI_BIT_TUN_CE (1 << 0)
#define FMI_BIT_TUN_CLK (1 << 1)
#define FMI_BIT_TUN_DATA (1 << 2)
#define FMI_BIT_VOL_SW (1 << 3)
#define FMI_BIT_TUN_STRQ (1 << 4)
static void fmi_set_pins(void *handle, u8 pins)
{
struct fmi *fmi = handle;
u8 bits = FMI_BIT_TUN_STRQ;
if (!fmi->mute)
bits |= FMI_BIT_VOL_SW;
if (pins & LM7000_DATA)
bits |= FMI_BIT_TUN_DATA;
if (pins & LM7000_CLK)
bits |= FMI_BIT_TUN_CLK;
if (pins & LM7000_CE)
bits |= FMI_BIT_TUN_CE;
mutex_lock(&fmi->lock);
outb_p(bits, fmi->io);
mutex_unlock(&fmi->lock);
}
static inline void fmi_mute(struct fmi *fmi)
{
mutex_lock(&fmi->lock);
outb(0x00, fmi->io);
mutex_unlock(&fmi->lock);
}
static inline void fmi_unmute(struct fmi *fmi)
{
mutex_lock(&fmi->lock);
outb(0x08, fmi->io);
mutex_unlock(&fmi->lock);
}
static inline int fmi_getsigstr(struct fmi *fmi)
{
int val;
int res;
mutex_lock(&fmi->lock);
val = fmi->mute ? 0x00 : 0x08; /* mute/unmute */
outb(val, fmi->io);
outb(val | 0x10, fmi->io);
msleep(143); /* was schedule_timeout(HZ/7) */
res = (int)inb(fmi->io + 1);
outb(val, fmi->io);
mutex_unlock(&fmi->lock);
return (res & 2) ? 0 : 0xFFFF;
}
static void fmi_set_freq(struct fmi *fmi)
{
fmi->curfreq = clamp(fmi->curfreq, RSF16_MINFREQ, RSF16_MAXFREQ);
/* rounding in steps of 800 to match the freq
that will be used */
lm7000_set_freq((fmi->curfreq / 800) * 800, fmi, fmi_set_pins);
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strscpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
strscpy(v->card, "SF16-FMI/FMP/FMD radio", sizeof(v->card));
strscpy(v->bus_info, "ISA:radio-sf16fmi", sizeof(v->bus_info));
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct fmi *fmi = video_drvdata(file);
if (v->index > 0)
return -EINVAL;
strscpy(v->name, "FM", sizeof(v->name));
v->type = V4L2_TUNER_RADIO;
v->rangelow = RSF16_MINFREQ;
v->rangehigh = RSF16_MAXFREQ;
v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
v->audmode = V4L2_TUNER_MODE_STEREO;
v->signal = fmi_getsigstr(fmi);
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_s_frequency(struct file *file, void *priv,
const struct v4l2_frequency *f)
{
struct fmi *fmi = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
fmi->curfreq = f->frequency;
fmi_set_freq(fmi);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct fmi *fmi = video_drvdata(file);
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = fmi->curfreq;
return 0;
}
static int fmi_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct fmi *fmi = container_of(ctrl->handler, struct fmi, hdl);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->val)
fmi_mute(fmi);
else
fmi_unmute(fmi);
fmi->mute = ctrl->val;
return 0;
}
return -EINVAL;
}
static const struct v4l2_ctrl_ops fmi_ctrl_ops = {
.s_ctrl = fmi_s_ctrl,
};
static const struct v4l2_file_operations fmi_fops = {
.owner = THIS_MODULE,
.open = v4l2_fh_open,
.release = v4l2_fh_release,
.poll = v4l2_ctrl_poll,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops fmi_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_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
/* ladis: this is my card. does any other types exist? */
static struct isapnp_device_id id_table[] = {
/* SF16-FMI */
{ ISAPNP_ANY_ID, ISAPNP_ANY_ID,
ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
/* SF16-FMD */
{ ISAPNP_ANY_ID, ISAPNP_ANY_ID,
ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad12), 0},
{ ISAPNP_CARD_END, },
};
MODULE_DEVICE_TABLE(isapnp, id_table);
static int __init isapnp_fmi_probe(void)
{
int i = 0;
while (id_table[i].card_vendor != 0 && dev == NULL) {
dev = pnp_find_dev(NULL, id_table[i].vendor,
id_table[i].function, NULL);
i++;
}
if (!dev)
return -ENODEV;
if (pnp_device_attach(dev) < 0)
return -EAGAIN;
if (pnp_activate_dev(dev) < 0) {
printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
pnp_device_detach(dev);
return -ENOMEM;
}
if (!pnp_port_valid(dev, 0)) {
pnp_device_detach(dev);
return -ENODEV;
}
i = pnp_port_start(dev, 0);
printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);
return i;
}
static int __init fmi_init(void)
{
struct fmi *fmi = &fmi_card;
struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
struct v4l2_ctrl_handler *hdl = &fmi->hdl;
int res, i;
static const int probe_ports[] = { 0, 0x284, 0x384 };
if (io < 0) {
for (i = 0; i < ARRAY_SIZE(probe_ports); i++) {
io = probe_ports[i];
if (io == 0) {
io = isapnp_fmi_probe();
if (io < 0)
continue;
pnp_attached = true;
}
if (!request_region(io, 2, "radio-sf16fmi")) {
if (pnp_attached)
pnp_device_detach(dev);
io = -1;
continue;
}
if (pnp_attached ||
((inb(io) & 0xf9) == 0xf9 && (inb(io) & 0x4) == 0))
break;
release_region(io, 2);
io = -1;
}
} else {
if (!request_region(io, 2, "radio-sf16fmi")) {
printk(KERN_ERR "radio-sf16fmi: port %#x already in use\n", io);
return -EBUSY;
}
if (inb(io) == 0xff) {
printk(KERN_ERR "radio-sf16fmi: card not present at %#x\n", io);
release_region(io, 2);
return -ENODEV;
}
}
if (io < 0) {
printk(KERN_ERR "radio-sf16fmi: no cards found\n");
return -ENODEV;
}
strscpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
fmi->io = io;
res = v4l2_device_register(NULL, v4l2_dev);
if (res < 0) {
release_region(fmi->io, 2);
if (pnp_attached)
pnp_device_detach(dev);
v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
return res;
}
v4l2_ctrl_handler_init(hdl, 1);
v4l2_ctrl_new_std(hdl, &fmi_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");
v4l2_ctrl_handler_free(hdl);
v4l2_device_unregister(v4l2_dev);
return res;
}
strscpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
fmi->vdev.v4l2_dev = v4l2_dev;
fmi->vdev.fops = &fmi_fops;
fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
fmi->vdev.release = video_device_release_empty;
fmi->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
video_set_drvdata(&fmi->vdev, fmi);
mutex_init(&fmi->lock);
/* mute card and set default frequency */
fmi->mute = true;
fmi->curfreq = RSF16_MINFREQ;
fmi_set_freq(fmi);
if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
v4l2_ctrl_handler_free(hdl);
v4l2_device_unregister(v4l2_dev);
release_region(fmi->io, 2);
if (pnp_attached)
pnp_device_detach(dev);
return -EINVAL;
}
v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
return 0;
}
static void __exit fmi_exit(void)
{
struct fmi *fmi = &fmi_card;
v4l2_ctrl_handler_free(&fmi->hdl);
video_unregister_device(&fmi->vdev);
v4l2_device_unregister(&fmi->v4l2_dev);
release_region(fmi->io, 2);
if (dev && pnp_attached)
pnp_device_detach(dev);
}
module_init(fmi_init);
module_exit(fmi_exit);
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