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515 lines
13 KiB
515 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Miro PCM20 radio driver for Linux radio support |
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* (c) 1998 Ruurd Reitsma <[email protected]> |
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* Thanks to Norberto Pellici for the ACI device interface specification |
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* The API part is based on the radiotrack driver by M. Kirkwood |
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* This driver relies on the aci mixer provided by the snd-miro |
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* ALSA driver. |
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* Look there for further info... |
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* |
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* From the original miro RDS sources: |
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* |
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* (c) 2001 Robert Siemer <[email protected]> |
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* |
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* Many thanks to Fred Seidel <[email protected]>, the |
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* designer of the RDS decoder hardware. With his help |
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* I was able to code this driver. |
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* Thanks also to Norberto Pellicci, Dominic Mounteney |
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* <[email protected]> and www.teleauskunft.de |
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* for good hints on finding Fred. It was somewhat hard |
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* to locate him here in Germany... [: |
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* |
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* This code has been reintroduced and converted to use |
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* the new V4L2 RDS API by: |
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* |
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* Hans Verkuil <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/delay.h> |
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#include <linux/videodev2.h> |
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#include <linux/kthread.h> |
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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-fh.h> |
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#include <media/v4l2-event.h> |
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#include <sound/aci.h> |
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|
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#define RDS_DATASHIFT 2 /* Bit 2 */ |
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#define RDS_DATAMASK (1 << RDS_DATASHIFT) |
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#define RDS_BUSYMASK 0x10 /* Bit 4 */ |
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#define RDS_CLOCKMASK 0x08 /* Bit 3 */ |
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#define RDS_DATA(x) (((x) >> RDS_DATASHIFT) & 1) |
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|
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#define RDS_STATUS 0x01 |
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#define RDS_STATIONNAME 0x02 |
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#define RDS_TEXT 0x03 |
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#define RDS_ALTFREQ 0x04 |
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#define RDS_TIMEDATE 0x05 |
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#define RDS_PI_CODE 0x06 |
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#define RDS_PTYTATP 0x07 |
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#define RDS_RESET 0x08 |
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#define RDS_RXVALUE 0x09 |
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|
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static int radio_nr = -1; |
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module_param(radio_nr, int, 0); |
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MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX). Default: -1 (autodetect)"); |
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|
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struct pcm20 { |
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struct v4l2_device v4l2_dev; |
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struct video_device vdev; |
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struct v4l2_ctrl_handler ctrl_handler; |
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struct v4l2_ctrl *rds_pty; |
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struct v4l2_ctrl *rds_ps_name; |
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struct v4l2_ctrl *rds_radio_test; |
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struct v4l2_ctrl *rds_ta; |
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struct v4l2_ctrl *rds_tp; |
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struct v4l2_ctrl *rds_ms; |
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/* thread for periodic RDS status checking */ |
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struct task_struct *kthread; |
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unsigned long freq; |
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u32 audmode; |
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struct snd_miro_aci *aci; |
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struct mutex lock; |
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}; |
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static struct pcm20 pcm20_card = { |
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.freq = 87 * 16000, |
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.audmode = V4L2_TUNER_MODE_STEREO, |
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}; |
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static int rds_waitread(struct snd_miro_aci *aci) |
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{ |
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u8 byte; |
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int i = 2000; |
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do { |
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byte = inb(aci->aci_port + ACI_REG_RDS); |
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i--; |
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} while ((byte & RDS_BUSYMASK) && i); |
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|
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/* |
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* It's magic, but without this the data that you read later on |
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* is unreliable and full of bit errors. With this 1 usec delay |
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* everything is fine. |
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*/ |
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udelay(1); |
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return i ? byte : -1; |
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} |
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static int rds_rawwrite(struct snd_miro_aci *aci, u8 byte) |
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{ |
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if (rds_waitread(aci) >= 0) { |
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outb(byte, aci->aci_port + ACI_REG_RDS); |
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return 0; |
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} |
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return -1; |
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} |
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static int rds_write(struct snd_miro_aci *aci, u8 byte) |
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{ |
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u8 sendbuffer[8]; |
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int i; |
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for (i = 7; i >= 0; i--) |
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sendbuffer[7 - i] = (byte & (1 << i)) ? RDS_DATAMASK : 0; |
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sendbuffer[0] |= RDS_CLOCKMASK; |
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for (i = 0; i < 8; i++) |
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rds_rawwrite(aci, sendbuffer[i]); |
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return 0; |
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} |
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static int rds_readcycle_nowait(struct snd_miro_aci *aci) |
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{ |
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outb(0, aci->aci_port + ACI_REG_RDS); |
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return rds_waitread(aci); |
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} |
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static int rds_readcycle(struct snd_miro_aci *aci) |
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{ |
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if (rds_rawwrite(aci, 0) < 0) |
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return -1; |
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return rds_waitread(aci); |
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} |
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static int rds_ack(struct snd_miro_aci *aci) |
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{ |
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int i = rds_readcycle(aci); |
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if (i < 0) |
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return -1; |
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if (i & RDS_DATAMASK) |
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return 0; /* ACK */ |
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return 1; /* NACK */ |
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} |
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static int rds_cmd(struct snd_miro_aci *aci, u8 cmd, u8 databuffer[], u8 datasize) |
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{ |
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int i, j; |
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rds_write(aci, cmd); |
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/* RDS_RESET doesn't need further processing */ |
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if (cmd == RDS_RESET) |
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return 0; |
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if (rds_ack(aci)) |
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return -EIO; |
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if (datasize == 0) |
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return 0; |
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|
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/* to be able to use rds_readcycle_nowait() |
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I have to waitread() here */ |
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if (rds_waitread(aci) < 0) |
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return -1; |
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memset(databuffer, 0, datasize); |
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for (i = 0; i < 8 * datasize; i++) { |
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j = rds_readcycle_nowait(aci); |
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if (j < 0) |
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return -EIO; |
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databuffer[i / 8] |= RDS_DATA(j) << (7 - (i % 8)); |
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} |
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return 0; |
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} |
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static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq) |
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{ |
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unsigned char freql; |
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unsigned char freqh; |
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struct snd_miro_aci *aci = dev->aci; |
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freq /= 160; |
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if (!(aci->aci_version == 0x07 || aci->aci_version >= 0xb0)) |
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freq /= 10; /* I don't know exactly which version |
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* needs this hack */ |
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freql = freq & 0xff; |
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freqh = freq >> 8; |
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rds_cmd(aci, RDS_RESET, NULL, 0); |
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return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh); |
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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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struct pcm20 *dev = video_drvdata(file); |
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strscpy(v->driver, "Miro PCM20", sizeof(v->driver)); |
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strscpy(v->card, "Miro PCM20", sizeof(v->card)); |
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snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name); |
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return 0; |
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} |
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static bool sanitize(char *p, int size) |
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{ |
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int i; |
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bool ret = true; |
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for (i = 0; i < size; i++) { |
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if (p[i] < 32) { |
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p[i] = ' '; |
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ret = false; |
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} |
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} |
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return ret; |
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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 pcm20 *dev = video_drvdata(file); |
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int res; |
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u8 buf; |
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if (v->index) |
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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 = 87*16000; |
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v->rangehigh = 108*16000; |
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res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTATION, -1, -1); |
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v->signal = (res & 0x80) ? 0 : 0xffff; |
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/* Note: stereo detection does not work if the audio is muted, |
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it will default to mono in that case. */ |
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res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1); |
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v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO : |
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V4L2_TUNER_SUB_STEREO; |
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | |
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V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_CONTROLS; |
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v->audmode = dev->audmode; |
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res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1); |
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if (res >= 0 && buf) |
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v->rxsubchans |= V4L2_TUNER_SUB_RDS; |
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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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struct pcm20 *dev = video_drvdata(file); |
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if (v->index) |
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return -EINVAL; |
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if (v->audmode > V4L2_TUNER_MODE_STEREO) |
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dev->audmode = V4L2_TUNER_MODE_STEREO; |
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else |
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dev->audmode = v->audmode; |
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO, |
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dev->audmode == V4L2_TUNER_MODE_MONO, -1); |
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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 pcm20 *dev = 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 = dev->freq; |
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return 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 pcm20 *dev = 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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dev->freq = clamp_t(u32, f->frequency, 87 * 16000U, 108 * 16000U); |
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pcm20_setfreq(dev, dev->freq); |
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return 0; |
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} |
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static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl) |
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{ |
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struct pcm20 *dev = container_of(ctrl->handler, struct pcm20, ctrl_handler); |
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switch (ctrl->id) { |
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case V4L2_CID_AUDIO_MUTE: |
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, ctrl->val, -1); |
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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 int pcm20_thread(void *data) |
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{ |
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struct pcm20 *dev = data; |
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const unsigned no_rds_start_counter = 5; |
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const unsigned sleep_msecs = 2000; |
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unsigned no_rds_counter = no_rds_start_counter; |
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for (;;) { |
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char text_buffer[66]; |
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u8 buf; |
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int res; |
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msleep_interruptible(sleep_msecs); |
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if (kthread_should_stop()) |
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break; |
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res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1); |
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if (res) |
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continue; |
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if (buf == 0) { |
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if (no_rds_counter == 0) |
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continue; |
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no_rds_counter--; |
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if (no_rds_counter) |
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continue; |
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/* |
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* No RDS seen for no_rds_start_counter * sleep_msecs |
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* milliseconds, clear all RDS controls to their |
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* default values. |
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*/ |
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v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, ""); |
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v4l2_ctrl_s_ctrl(dev->rds_ms, 1); |
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v4l2_ctrl_s_ctrl(dev->rds_ta, 0); |
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v4l2_ctrl_s_ctrl(dev->rds_tp, 0); |
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v4l2_ctrl_s_ctrl(dev->rds_pty, 0); |
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v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, ""); |
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continue; |
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} |
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no_rds_counter = no_rds_start_counter; |
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res = rds_cmd(dev->aci, RDS_STATUS, &buf, 1); |
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if (res) |
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continue; |
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if ((buf >> 3) & 1) { |
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res = rds_cmd(dev->aci, RDS_STATIONNAME, text_buffer, 8); |
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text_buffer[8] = 0; |
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if (!res && sanitize(text_buffer, 8)) |
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v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, text_buffer); |
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} |
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if ((buf >> 6) & 1) { |
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u8 pty; |
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res = rds_cmd(dev->aci, RDS_PTYTATP, &pty, 1); |
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if (!res) { |
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v4l2_ctrl_s_ctrl(dev->rds_ms, !!(pty & 0x01)); |
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v4l2_ctrl_s_ctrl(dev->rds_ta, !!(pty & 0x02)); |
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v4l2_ctrl_s_ctrl(dev->rds_tp, !!(pty & 0x80)); |
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v4l2_ctrl_s_ctrl(dev->rds_pty, (pty >> 2) & 0x1f); |
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} |
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} |
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if ((buf >> 4) & 1) { |
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res = rds_cmd(dev->aci, RDS_TEXT, text_buffer, 65); |
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text_buffer[65] = 0; |
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if (!res && sanitize(text_buffer + 1, 64)) |
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v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, text_buffer + 1); |
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} |
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} |
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return 0; |
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} |
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static int pcm20_open(struct file *file) |
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{ |
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struct pcm20 *dev = video_drvdata(file); |
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int res = v4l2_fh_open(file); |
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if (!res && v4l2_fh_is_singular_file(file) && |
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IS_ERR_OR_NULL(dev->kthread)) { |
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dev->kthread = kthread_run(pcm20_thread, dev, "%s", |
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dev->v4l2_dev.name); |
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if (IS_ERR(dev->kthread)) { |
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v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n"); |
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v4l2_fh_release(file); |
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return PTR_ERR(dev->kthread); |
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} |
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} |
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return res; |
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} |
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static int pcm20_release(struct file *file) |
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{ |
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struct pcm20 *dev = video_drvdata(file); |
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if (v4l2_fh_is_singular_file(file) && !IS_ERR_OR_NULL(dev->kthread)) { |
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kthread_stop(dev->kthread); |
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dev->kthread = NULL; |
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} |
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return v4l2_fh_release(file); |
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} |
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static const struct v4l2_file_operations pcm20_fops = { |
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.owner = THIS_MODULE, |
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.open = pcm20_open, |
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.poll = v4l2_ctrl_poll, |
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.release = pcm20_release, |
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.unlocked_ioctl = video_ioctl2, |
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}; |
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static const struct v4l2_ioctl_ops pcm20_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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static const struct v4l2_ctrl_ops pcm20_ctrl_ops = { |
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.s_ctrl = pcm20_s_ctrl, |
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}; |
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static int __init pcm20_init(void) |
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{ |
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struct pcm20 *dev = &pcm20_card; |
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struct v4l2_device *v4l2_dev = &dev->v4l2_dev; |
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struct v4l2_ctrl_handler *hdl; |
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int res; |
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dev->aci = snd_aci_get_aci(); |
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if (dev->aci == NULL) { |
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v4l2_err(v4l2_dev, |
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"you must load the snd-miro driver first!\n"); |
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return -ENODEV; |
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} |
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strscpy(v4l2_dev->name, "radio-miropcm20", sizeof(v4l2_dev->name)); |
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mutex_init(&dev->lock); |
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res = v4l2_device_register(NULL, v4l2_dev); |
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if (res < 0) { |
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v4l2_err(v4l2_dev, "could not register v4l2_device\n"); |
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return -EINVAL; |
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} |
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hdl = &dev->ctrl_handler; |
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v4l2_ctrl_handler_init(hdl, 7); |
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v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops, |
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1); |
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dev->rds_pty = v4l2_ctrl_new_std(hdl, NULL, |
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V4L2_CID_RDS_RX_PTY, 0, 0x1f, 1, 0); |
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dev->rds_ps_name = v4l2_ctrl_new_std(hdl, NULL, |
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V4L2_CID_RDS_RX_PS_NAME, 0, 8, 8, 0); |
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dev->rds_radio_test = v4l2_ctrl_new_std(hdl, NULL, |
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V4L2_CID_RDS_RX_RADIO_TEXT, 0, 64, 64, 0); |
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dev->rds_ta = v4l2_ctrl_new_std(hdl, NULL, |
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V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT, 0, 1, 1, 0); |
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dev->rds_tp = v4l2_ctrl_new_std(hdl, NULL, |
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V4L2_CID_RDS_RX_TRAFFIC_PROGRAM, 0, 1, 1, 0); |
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dev->rds_ms = v4l2_ctrl_new_std(hdl, NULL, |
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V4L2_CID_RDS_RX_MUSIC_SPEECH, 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 control\n"); |
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goto err_hdl; |
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} |
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strscpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name)); |
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dev->vdev.v4l2_dev = v4l2_dev; |
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dev->vdev.fops = &pcm20_fops; |
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dev->vdev.ioctl_ops = &pcm20_ioctl_ops; |
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dev->vdev.release = video_device_release_empty; |
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dev->vdev.lock = &dev->lock; |
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dev->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO | |
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V4L2_CAP_RDS_CAPTURE; |
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video_set_drvdata(&dev->vdev, dev); |
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO, |
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dev->audmode == V4L2_TUNER_MODE_MONO, -1); |
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pcm20_setfreq(dev, dev->freq); |
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|
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if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) |
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goto err_hdl; |
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|
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v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n"); |
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return 0; |
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err_hdl: |
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v4l2_ctrl_handler_free(hdl); |
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v4l2_device_unregister(v4l2_dev); |
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return -EINVAL; |
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} |
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|
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MODULE_AUTHOR("Ruurd Reitsma, Krzysztof Helt"); |
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MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card."); |
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MODULE_LICENSE("GPL"); |
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|
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static void __exit pcm20_cleanup(void) |
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{ |
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struct pcm20 *dev = &pcm20_card; |
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|
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video_unregister_device(&dev->vdev); |
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snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, 1, -1); |
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v4l2_ctrl_handler_free(&dev->ctrl_handler); |
|
v4l2_device_unregister(&dev->v4l2_dev); |
|
} |
|
|
|
module_init(pcm20_init); |
|
module_exit(pcm20_cleanup);
|
|
|