![Mauro Carvalho Chehab](/assets/img/avatar_default.png)
The implementation of strscpy() is more robust and safer. That's now the recommended way to copy NUL terminated strings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
383 lines
9.3 KiB
C
383 lines
9.3 KiB
C
/* SF16-FMI, SF16-FMP and SF16-FMD radio driver for Linux radio support
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* heavily based on rtrack driver...
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* (c) 1997 M. Kirkwood
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* (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
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*
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* Fitted to new interface by Alan Cox <alan@lxorguk.ukuu.org.uk>
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* Made working and cleaned up functions <mikael.hedin@irf.se>
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* Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
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*
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* Notes on the hardware
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*
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* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
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* No volume control - only mute/unmute - you have to use line volume
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* control on SB-part of SF16-FMI/SF16-FMP/SF16-FMD
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*
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* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
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*/
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#include <linux/kernel.h> /* __setup */
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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 */
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#include <linux/isapnp.h>
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#include <linux/mutex.h>
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#include <linux/videodev2.h> /* kernel radio structs */
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#include <linux/io.h> /* outb, outb_p */
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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#include "lm7000.h"
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MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
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MODULE_DESCRIPTION("A driver for the SF16-FMI, SF16-FMP and SF16-FMD radio.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("0.0.3");
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static int io = -1;
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static int radio_nr = -1;
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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "I/O address of the SF16-FMI/SF16-FMP/SF16-FMD card (0x284 or 0x384)");
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module_param(radio_nr, int, 0);
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struct fmi
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{
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struct v4l2_device v4l2_dev;
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struct v4l2_ctrl_handler hdl;
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struct video_device vdev;
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int io;
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bool mute;
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u32 curfreq; /* freq in kHz */
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struct mutex lock;
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};
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static struct fmi fmi_card;
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static struct pnp_dev *dev;
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static bool pnp_attached;
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#define RSF16_MINFREQ (87U * 16000)
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#define RSF16_MAXFREQ (108U * 16000)
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#define FMI_BIT_TUN_CE (1 << 0)
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#define FMI_BIT_TUN_CLK (1 << 1)
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#define FMI_BIT_TUN_DATA (1 << 2)
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#define FMI_BIT_VOL_SW (1 << 3)
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#define FMI_BIT_TUN_STRQ (1 << 4)
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static void fmi_set_pins(void *handle, u8 pins)
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{
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struct fmi *fmi = handle;
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u8 bits = FMI_BIT_TUN_STRQ;
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if (!fmi->mute)
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bits |= FMI_BIT_VOL_SW;
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if (pins & LM7000_DATA)
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bits |= FMI_BIT_TUN_DATA;
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if (pins & LM7000_CLK)
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bits |= FMI_BIT_TUN_CLK;
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if (pins & LM7000_CE)
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bits |= FMI_BIT_TUN_CE;
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mutex_lock(&fmi->lock);
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outb_p(bits, fmi->io);
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mutex_unlock(&fmi->lock);
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}
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static inline void fmi_mute(struct fmi *fmi)
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{
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mutex_lock(&fmi->lock);
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outb(0x00, fmi->io);
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mutex_unlock(&fmi->lock);
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}
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static inline void fmi_unmute(struct fmi *fmi)
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{
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mutex_lock(&fmi->lock);
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outb(0x08, fmi->io);
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mutex_unlock(&fmi->lock);
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}
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static inline int fmi_getsigstr(struct fmi *fmi)
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{
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int val;
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int res;
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mutex_lock(&fmi->lock);
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val = fmi->mute ? 0x00 : 0x08; /* mute/unmute */
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outb(val, fmi->io);
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outb(val | 0x10, fmi->io);
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msleep(143); /* was schedule_timeout(HZ/7) */
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res = (int)inb(fmi->io + 1);
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outb(val, fmi->io);
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mutex_unlock(&fmi->lock);
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return (res & 2) ? 0 : 0xFFFF;
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}
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static void fmi_set_freq(struct fmi *fmi)
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{
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fmi->curfreq = clamp(fmi->curfreq, RSF16_MINFREQ, RSF16_MAXFREQ);
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/* rounding in steps of 800 to match the freq
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that will be used */
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lm7000_set_freq((fmi->curfreq / 800) * 800, fmi, fmi_set_pins);
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}
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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strscpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
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strscpy(v->card, "SF16-FMI/FMP/FMD radio", sizeof(v->card));
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strscpy(v->bus_info, "ISA:radio-sf16fmi", sizeof(v->bus_info));
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v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
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v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct fmi *fmi = video_drvdata(file);
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if (v->index > 0)
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return -EINVAL;
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strscpy(v->name, "FM", sizeof(v->name));
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v->type = V4L2_TUNER_RADIO;
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v->rangelow = RSF16_MINFREQ;
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v->rangehigh = RSF16_MAXFREQ;
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v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
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v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
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v->audmode = V4L2_TUNER_MODE_STEREO;
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v->signal = fmi_getsigstr(fmi);
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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const struct v4l2_tuner *v)
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{
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return v->index ? -EINVAL : 0;
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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const struct v4l2_frequency *f)
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{
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struct fmi *fmi = video_drvdata(file);
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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fmi->curfreq = f->frequency;
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fmi_set_freq(fmi);
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return 0;
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct fmi *fmi = video_drvdata(file);
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if (f->tuner != 0)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = fmi->curfreq;
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return 0;
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}
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static int fmi_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct fmi *fmi = container_of(ctrl->handler, struct fmi, hdl);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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if (ctrl->val)
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fmi_mute(fmi);
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else
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fmi_unmute(fmi);
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fmi->mute = ctrl->val;
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return 0;
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}
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return -EINVAL;
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}
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static const struct v4l2_ctrl_ops fmi_ctrl_ops = {
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.s_ctrl = fmi_s_ctrl,
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};
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static const struct v4l2_file_operations fmi_fops = {
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.owner = THIS_MODULE,
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.open = v4l2_fh_open,
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.release = v4l2_fh_release,
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.poll = v4l2_ctrl_poll,
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.unlocked_ioctl = video_ioctl2,
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};
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static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_tuner = vidioc_g_tuner,
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.vidioc_s_tuner = vidioc_s_tuner,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_log_status = v4l2_ctrl_log_status,
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.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
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.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
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};
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/* ladis: this is my card. does any other types exist? */
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static struct isapnp_device_id id_table[] = {
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/* SF16-FMI */
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{ ISAPNP_ANY_ID, ISAPNP_ANY_ID,
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ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
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/* SF16-FMD */
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{ ISAPNP_ANY_ID, ISAPNP_ANY_ID,
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ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad12), 0},
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{ ISAPNP_CARD_END, },
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};
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MODULE_DEVICE_TABLE(isapnp, id_table);
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static int __init isapnp_fmi_probe(void)
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{
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int i = 0;
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while (id_table[i].card_vendor != 0 && dev == NULL) {
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dev = pnp_find_dev(NULL, id_table[i].vendor,
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id_table[i].function, NULL);
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i++;
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}
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if (!dev)
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return -ENODEV;
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if (pnp_device_attach(dev) < 0)
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return -EAGAIN;
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if (pnp_activate_dev(dev) < 0) {
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printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
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pnp_device_detach(dev);
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return -ENOMEM;
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}
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if (!pnp_port_valid(dev, 0)) {
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pnp_device_detach(dev);
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return -ENODEV;
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}
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i = pnp_port_start(dev, 0);
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printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);
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return i;
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}
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static int __init fmi_init(void)
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{
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struct fmi *fmi = &fmi_card;
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struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
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struct v4l2_ctrl_handler *hdl = &fmi->hdl;
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int res, i;
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int probe_ports[] = { 0, 0x284, 0x384 };
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if (io < 0) {
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for (i = 0; i < ARRAY_SIZE(probe_ports); i++) {
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io = probe_ports[i];
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if (io == 0) {
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io = isapnp_fmi_probe();
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if (io < 0)
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continue;
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pnp_attached = true;
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}
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if (!request_region(io, 2, "radio-sf16fmi")) {
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if (pnp_attached)
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pnp_device_detach(dev);
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io = -1;
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continue;
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}
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if (pnp_attached ||
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((inb(io) & 0xf9) == 0xf9 && (inb(io) & 0x4) == 0))
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break;
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release_region(io, 2);
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io = -1;
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}
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} else {
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if (!request_region(io, 2, "radio-sf16fmi")) {
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printk(KERN_ERR "radio-sf16fmi: port %#x already in use\n", io);
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return -EBUSY;
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}
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if (inb(io) == 0xff) {
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printk(KERN_ERR "radio-sf16fmi: card not present at %#x\n", io);
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release_region(io, 2);
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return -ENODEV;
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}
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}
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if (io < 0) {
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printk(KERN_ERR "radio-sf16fmi: no cards found\n");
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return -ENODEV;
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}
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strscpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
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fmi->io = io;
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res = v4l2_device_register(NULL, v4l2_dev);
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if (res < 0) {
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release_region(fmi->io, 2);
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if (pnp_attached)
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pnp_device_detach(dev);
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v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
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return res;
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}
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v4l2_ctrl_handler_init(hdl, 1);
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v4l2_ctrl_new_std(hdl, &fmi_ctrl_ops,
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
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v4l2_dev->ctrl_handler = hdl;
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if (hdl->error) {
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res = hdl->error;
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v4l2_err(v4l2_dev, "Could not register controls\n");
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v4l2_ctrl_handler_free(hdl);
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v4l2_device_unregister(v4l2_dev);
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return res;
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}
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strscpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
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fmi->vdev.v4l2_dev = v4l2_dev;
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fmi->vdev.fops = &fmi_fops;
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fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
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fmi->vdev.release = video_device_release_empty;
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video_set_drvdata(&fmi->vdev, fmi);
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mutex_init(&fmi->lock);
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/* mute card and set default frequency */
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fmi->mute = true;
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fmi->curfreq = RSF16_MINFREQ;
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fmi_set_freq(fmi);
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if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
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v4l2_ctrl_handler_free(hdl);
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v4l2_device_unregister(v4l2_dev);
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release_region(fmi->io, 2);
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if (pnp_attached)
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pnp_device_detach(dev);
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return -EINVAL;
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}
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v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
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return 0;
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}
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static void __exit fmi_exit(void)
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{
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struct fmi *fmi = &fmi_card;
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v4l2_ctrl_handler_free(&fmi->hdl);
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video_unregister_device(&fmi->vdev);
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v4l2_device_unregister(&fmi->v4l2_dev);
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release_region(fmi->io, 2);
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if (dev && pnp_attached)
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pnp_device_detach(dev);
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}
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module_init(fmi_init);
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module_exit(fmi_exit);
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