Logo Search packages:      
Sourcecode: linux version File versions  Download package

saa7191.c

/*
 *  saa7191.c - Philips SAA7191 video decoder driver
 *
 *  Copyright (C) 2003 Ladislav Michl <ladis@linux-mips.org>
 *  Copyright (C) 2004,2005 Mikael Nousiainen <tmnousia@cc.hut.fi>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/slab.h>

#include <linux/videodev.h>
#include <linux/video_decoder.h>
#include <linux/i2c.h>

#include "saa7191.h"

#define SAA7191_MODULE_VERSION      "0.0.5"

MODULE_DESCRIPTION("Philips SAA7191 video decoder driver");
MODULE_VERSION(SAA7191_MODULE_VERSION);
MODULE_AUTHOR("Mikael Nousiainen <tmnousia@cc.hut.fi>");
MODULE_LICENSE("GPL");

// #define SAA7191_DEBUG

#ifdef SAA7191_DEBUG
#define dprintk(x...) printk("SAA7191: " x);
#else
#define dprintk(x...)
#endif

#define SAA7191_SYNC_COUNT    30
#define SAA7191_SYNC_DELAY    100   /* milliseconds */

struct saa7191 {
      struct i2c_client *client;

      /* the register values are stored here as the actual
       * I2C-registers are write-only */
      u8 reg[25];

      int input;
      int norm;
};

static struct i2c_driver i2c_driver_saa7191;

static const u8 initseq[] = {
      0,    /* Subaddress */

      0x50, /* (0x50) SAA7191_REG_IDEL */

      /* 50 Hz signal timing */
      0x30, /* (0x30) SAA7191_REG_HSYB */
      0x00, /* (0x00) SAA7191_REG_HSYS */
      0xe8, /* (0xe8) SAA7191_REG_HCLB */
      0xb6, /* (0xb6) SAA7191_REG_HCLS */
      0xf4, /* (0xf4) SAA7191_REG_HPHI */

      /* control */
      SAA7191_LUMA_APER_1,    /* (0x01) SAA7191_REG_LUMA - CVBS mode */
      0x00, /* (0x00) SAA7191_REG_HUEC */
      0xf8, /* (0xf8) SAA7191_REG_CKTQ */
      0xf8, /* (0xf8) SAA7191_REG_CKTS */
      0x90, /* (0x90) SAA7191_REG_PLSE */
      0x90, /* (0x90) SAA7191_REG_SESE */
      0x00, /* (0x00) SAA7191_REG_GAIN */
      SAA7191_STDC_NFEN | SAA7191_STDC_HRMV,    /* (0x0c) SAA7191_REG_STDC
                                     * - not SECAM,
                                     * slow time constant */
      SAA7191_IOCK_OEDC | SAA7191_IOCK_OEHS | SAA7191_IOCK_OEVS
      | SAA7191_IOCK_OEDY,    /* (0x78) SAA7191_REG_IOCK
                         * - chroma from CVBS, GPSW1 & 2 off */
      SAA7191_CTL3_AUFD | SAA7191_CTL3_SCEN | SAA7191_CTL3_OFTS
      | SAA7191_CTL3_YDEL0,   /* (0x99) SAA7191_REG_CTL3
                         * - automatic field detection */
      0x00, /* (0x00) SAA7191_REG_CTL4 */
      0x2c, /* (0x2c) SAA7191_REG_CHCV - PAL nominal value */
      0x00, /* unused */
      0x00, /* unused */

      /* 60 Hz signal timing */
      0x34, /* (0x34) SAA7191_REG_HS6B */
      0x0a, /* (0x0a) SAA7191_REG_HS6S */
      0xf4, /* (0xf4) SAA7191_REG_HC6B */
      0xce, /* (0xce) SAA7191_REG_HC6S */
      0xf4, /* (0xf4) SAA7191_REG_HP6I */
};

/* SAA7191 register handling */

static u8 saa7191_read_reg(struct i2c_client *client,
                     u8 reg)
{
      return ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg];
}

static int saa7191_read_status(struct i2c_client *client,
                         u8 *value)
{
      int ret;

      ret = i2c_master_recv(client, value, 1);
      if (ret < 0) {
            printk(KERN_ERR "SAA7191: saa7191_read_status(): read failed\n");
            return ret;
      }

      return 0;
}


static int saa7191_write_reg(struct i2c_client *client, u8 reg,
                       u8 value)
{
      ((struct saa7191 *)i2c_get_clientdata(client))->reg[reg] = value;
      return i2c_smbus_write_byte_data(client, reg, value);
}

/* the first byte of data must be the first subaddress number (register) */
static int saa7191_write_block(struct i2c_client *client,
                         u8 length, const u8 *data)
{
      int i;
      int ret;

      struct saa7191 *decoder = (struct saa7191 *)i2c_get_clientdata(client);
      for (i = 0; i < (length - 1); i++) {
            decoder->reg[data[0] + i] = data[i + 1];
      }

      ret = i2c_master_send(client, data, length);
      if (ret < 0) {
            printk(KERN_ERR "SAA7191: saa7191_write_block(): "
                   "write failed\n");
            return ret;
      }

      return 0;
}

/* Helper functions */

static int saa7191_set_input(struct i2c_client *client, int input)
{
      struct saa7191 *decoder = i2c_get_clientdata(client);
      u8 luma = saa7191_read_reg(client, SAA7191_REG_LUMA);
      u8 iock = saa7191_read_reg(client, SAA7191_REG_IOCK);
      int err;

      switch (input) {
      case SAA7191_INPUT_COMPOSITE: /* Set Composite input */
            iock &= ~(SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW1
                    | SAA7191_IOCK_GPSW2);
            /* Chrominance trap active */
            luma &= ~SAA7191_LUMA_BYPS;
            break;
      case SAA7191_INPUT_SVIDEO: /* Set S-Video input */
            iock |= SAA7191_IOCK_CHRS | SAA7191_IOCK_GPSW2;
            /* Chrominance trap bypassed */
            luma |= SAA7191_LUMA_BYPS;
            break;
      default:
            return -EINVAL;
      }

      err = saa7191_write_reg(client, SAA7191_REG_LUMA, luma);
      if (err)
            return -EIO;
      err = saa7191_write_reg(client, SAA7191_REG_IOCK, iock);
      if (err)
            return -EIO;

      decoder->input = input;

      return 0;
}

static int saa7191_set_norm(struct i2c_client *client, int norm)
{
      struct saa7191 *decoder = i2c_get_clientdata(client);
      u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
      u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
      u8 chcv = saa7191_read_reg(client, SAA7191_REG_CHCV);
      int err;

      switch(norm) {
      case SAA7191_NORM_PAL:
            stdc &= ~SAA7191_STDC_SECS;
            ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
            chcv = SAA7191_CHCV_PAL;
            break;
      case SAA7191_NORM_NTSC:
            stdc &= ~SAA7191_STDC_SECS;
            ctl3 &= ~SAA7191_CTL3_AUFD;
            ctl3 |= SAA7191_CTL3_FSEL;
            chcv = SAA7191_CHCV_NTSC;
            break;
      case SAA7191_NORM_SECAM:
            stdc |= SAA7191_STDC_SECS;
            ctl3 &= ~(SAA7191_CTL3_AUFD | SAA7191_CTL3_FSEL);
            chcv = SAA7191_CHCV_PAL;
            break;
      default:
            return -EINVAL;
      }

      err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
      if (err)
            return -EIO;
      err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
      if (err)
            return -EIO;
      err = saa7191_write_reg(client, SAA7191_REG_CHCV, chcv);
      if (err)
            return -EIO;

      decoder->norm = norm;

      dprintk("ctl3: %02x stdc: %02x chcv: %02x\n", ctl3,
            stdc, chcv);
      dprintk("norm: %d\n", norm);

      return 0;
}

static int saa7191_wait_for_signal(struct i2c_client *client, u8 *status)
{
      int i = 0;

      dprintk("Checking for signal...\n");

      for (i = 0; i < SAA7191_SYNC_COUNT; i++) {
            if (saa7191_read_status(client, status))
                  return -EIO;

            if (((*status) & SAA7191_STATUS_HLCK) == 0) {
                  dprintk("Signal found\n");
                  return 0;
            }

            msleep(SAA7191_SYNC_DELAY);
      }

      dprintk("No signal\n");

      return -EBUSY;
}

static int saa7191_autodetect_norm_extended(struct i2c_client *client)
{
      u8 stdc = saa7191_read_reg(client, SAA7191_REG_STDC);
      u8 ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
      u8 status;
      int err = 0;

      dprintk("SAA7191 extended signal auto-detection...\n");

      stdc &= ~SAA7191_STDC_SECS;
      ctl3 &= ~(SAA7191_CTL3_FSEL);

      err = saa7191_write_reg(client, SAA7191_REG_STDC, stdc);
      if (err) {
            err = -EIO;
            goto out;
      }
      err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
      if (err) {
            err = -EIO;
            goto out;
      }

      ctl3 |= SAA7191_CTL3_AUFD;
      err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
      if (err) {
            err = -EIO;
            goto out;
      }

      msleep(SAA7191_SYNC_DELAY);

      err = saa7191_wait_for_signal(client, &status);
      if (err)
            goto out;

      if (status & SAA7191_STATUS_FIDT) {
            /* 60Hz signal -> NTSC */
            dprintk("60Hz signal: NTSC\n");
            return saa7191_set_norm(client, SAA7191_NORM_NTSC);
      }

      /* 50Hz signal */
      dprintk("50Hz signal: Trying PAL...\n");

      /* try PAL first */
      err = saa7191_set_norm(client, SAA7191_NORM_PAL);
      if (err)
            goto out;

      msleep(SAA7191_SYNC_DELAY);

      err = saa7191_wait_for_signal(client, &status);
      if (err)
            goto out;

      /* not 50Hz ? */
      if (status & SAA7191_STATUS_FIDT) {
            dprintk("No 50Hz signal\n");
            err = -EAGAIN;
            goto out;
      }

      if (status & SAA7191_STATUS_CODE) {
            dprintk("PAL\n");
            return 0;
      }

      dprintk("No color detected with PAL - Trying SECAM...\n");

      /* no color detected ? -> try SECAM */
      err = saa7191_set_norm(client,
                         SAA7191_NORM_SECAM);
      if (err)
            goto out;

      msleep(SAA7191_SYNC_DELAY);

      err = saa7191_wait_for_signal(client, &status);
      if (err)
            goto out;

      /* not 50Hz ? */
      if (status & SAA7191_STATUS_FIDT) {
            dprintk("No 50Hz signal\n");
            err = -EAGAIN;
            goto out;
      }

      if (status & SAA7191_STATUS_CODE) {
            /* Color detected -> SECAM */
            dprintk("SECAM\n");
            return 0;
      }

      dprintk("No color detected with SECAM - Going back to PAL.\n");

      /* still no color detected ?
       * -> set norm back to PAL */
      err = saa7191_set_norm(client,
                         SAA7191_NORM_PAL);
      if (err)
            goto out;

out:
      ctl3 = saa7191_read_reg(client, SAA7191_REG_CTL3);
      if (ctl3 & SAA7191_CTL3_AUFD) {
            ctl3 &= ~(SAA7191_CTL3_AUFD);
            err = saa7191_write_reg(client, SAA7191_REG_CTL3, ctl3);
            if (err) {
                  err = -EIO;
            }
      }

      return err;
}

static int saa7191_autodetect_norm(struct i2c_client *client)
{
      u8 status;

      dprintk("SAA7191 signal auto-detection...\n");

      dprintk("Reading status...\n");

      if (saa7191_read_status(client, &status))
            return -EIO;

      dprintk("Checking for signal...\n");

      /* no signal ? */
      if (status & SAA7191_STATUS_HLCK) {
            dprintk("No signal\n");
            return -EBUSY;
      }

      dprintk("Signal found\n");

      if (status & SAA7191_STATUS_FIDT) {
            /* 60hz signal -> NTSC */
            dprintk("NTSC\n");
            return saa7191_set_norm(client, SAA7191_NORM_NTSC);
      } else {
            /* 50hz signal -> PAL */
            dprintk("PAL\n");
            return saa7191_set_norm(client, SAA7191_NORM_PAL);
      }
}

static int saa7191_get_control(struct i2c_client *client,
                         struct saa7191_control *ctrl)
{
      u8 reg;
      int ret = 0;

      switch (ctrl->type) {
      case SAA7191_CONTROL_BANDPASS:
      case SAA7191_CONTROL_BANDPASS_WEIGHT:
      case SAA7191_CONTROL_CORING:
            reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
            switch (ctrl->type) {
            case SAA7191_CONTROL_BANDPASS:
                  ctrl->value = ((s32)reg & SAA7191_LUMA_BPSS_MASK)
                        >> SAA7191_LUMA_BPSS_SHIFT;
                  break;
            case SAA7191_CONTROL_BANDPASS_WEIGHT:
                  ctrl->value = ((s32)reg & SAA7191_LUMA_APER_MASK)
                        >> SAA7191_LUMA_APER_SHIFT;
                  break;
            case SAA7191_CONTROL_CORING:
                  ctrl->value = ((s32)reg & SAA7191_LUMA_CORI_MASK)
                        >> SAA7191_LUMA_CORI_SHIFT;
                  break;
            }
            break;
      case SAA7191_CONTROL_FORCE_COLOUR:
      case SAA7191_CONTROL_CHROMA_GAIN:
            reg = saa7191_read_reg(client, SAA7191_REG_GAIN);
            if (ctrl->type == SAA7191_CONTROL_FORCE_COLOUR)
                  ctrl->value = ((s32)reg & SAA7191_GAIN_COLO) ? 1 : 0;
            else
                  ctrl->value = ((s32)reg & SAA7191_GAIN_LFIS_MASK)
                        >> SAA7191_GAIN_LFIS_SHIFT;
            break;
      case SAA7191_CONTROL_HUE:
            reg = saa7191_read_reg(client, SAA7191_REG_HUEC);
            if (reg < 0x80)
                  reg += 0x80;
            else
                  reg -= 0x80;
            ctrl->value = (s32)reg;
            break;
      case SAA7191_CONTROL_VTRC:
            reg = saa7191_read_reg(client, SAA7191_REG_STDC);
            ctrl->value = ((s32)reg & SAA7191_STDC_VTRC) ? 1 : 0;
            break;
      case SAA7191_CONTROL_LUMA_DELAY:
            reg = saa7191_read_reg(client, SAA7191_REG_CTL3);
            ctrl->value = ((s32)reg & SAA7191_CTL3_YDEL_MASK)
                  >> SAA7191_CTL3_YDEL_SHIFT;
            if (ctrl->value >= 4)
                  ctrl->value -= 8;
            break;
      case SAA7191_CONTROL_VNR:
            reg = saa7191_read_reg(client, SAA7191_REG_CTL4);
            ctrl->value = ((s32)reg & SAA7191_CTL4_VNOI_MASK)
                  >> SAA7191_CTL4_VNOI_SHIFT;
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

static int saa7191_set_control(struct i2c_client *client,
                         struct saa7191_control *ctrl)
{
      u8 reg;
      int ret = 0;

      switch (ctrl->type) {
      case SAA7191_CONTROL_BANDPASS:
      case SAA7191_CONTROL_BANDPASS_WEIGHT:
      case SAA7191_CONTROL_CORING:
            reg = saa7191_read_reg(client, SAA7191_REG_LUMA);
            switch (ctrl->type) {
            case SAA7191_CONTROL_BANDPASS:
                  reg &= ~SAA7191_LUMA_BPSS_MASK;
                  reg |= (ctrl->value << SAA7191_LUMA_BPSS_SHIFT)
                        & SAA7191_LUMA_BPSS_MASK;
                  break;
            case SAA7191_CONTROL_BANDPASS_WEIGHT:
                  reg &= ~SAA7191_LUMA_APER_MASK;
                  reg |= (ctrl->value << SAA7191_LUMA_APER_SHIFT)
                        & SAA7191_LUMA_APER_MASK;
                  break;
            case SAA7191_CONTROL_CORING:
                  reg &= ~SAA7191_LUMA_CORI_MASK;
                  reg |= (ctrl->value << SAA7191_LUMA_CORI_SHIFT)
                        & SAA7191_LUMA_CORI_MASK;
                  break;
            }
            ret = saa7191_write_reg(client, SAA7191_REG_LUMA, reg);
            break;
      case SAA7191_CONTROL_FORCE_COLOUR:
      case SAA7191_CONTROL_CHROMA_GAIN:
            reg = saa7191_read_reg(client, SAA7191_REG_GAIN);
            if (ctrl->type == SAA7191_CONTROL_FORCE_COLOUR) {
                  if (ctrl->value)
                        reg |= SAA7191_GAIN_COLO;
                  else
                        reg &= ~SAA7191_GAIN_COLO;
            } else {
                  reg &= ~SAA7191_GAIN_LFIS_MASK;
                  reg |= (ctrl->value << SAA7191_GAIN_LFIS_SHIFT)
                        & SAA7191_GAIN_LFIS_MASK;
            }
            ret = saa7191_write_reg(client, SAA7191_REG_GAIN, reg);
            break;
      case SAA7191_CONTROL_HUE:
            reg = ctrl->value & 0xff;
            if (reg < 0x80)
                  reg += 0x80;
            else
                  reg -= 0x80;
            ret = saa7191_write_reg(client, SAA7191_REG_HUEC, reg);
            break;
      case SAA7191_CONTROL_VTRC:
            reg = saa7191_read_reg(client, SAA7191_REG_STDC);
            if (ctrl->value)
                  reg |= SAA7191_STDC_VTRC;
            else
                  reg &= ~SAA7191_STDC_VTRC;
            ret = saa7191_write_reg(client, SAA7191_REG_STDC, reg);
            break;
      case SAA7191_CONTROL_LUMA_DELAY: {
            s32 value = ctrl->value;
            if (value < 0)
                  value += 8;
            reg = saa7191_read_reg(client, SAA7191_REG_CTL3);
            reg &= ~SAA7191_CTL3_YDEL_MASK;
            reg |= (value << SAA7191_CTL3_YDEL_SHIFT)
                  & SAA7191_CTL3_YDEL_MASK;
            ret = saa7191_write_reg(client, SAA7191_REG_CTL3, reg);
            break;
      }
      case SAA7191_CONTROL_VNR:
            reg = saa7191_read_reg(client, SAA7191_REG_CTL4);
            reg &= ~SAA7191_CTL4_VNOI_MASK;
            reg |= (ctrl->value << SAA7191_CTL4_VNOI_SHIFT)
                  & SAA7191_CTL4_VNOI_MASK;
            ret = saa7191_write_reg(client, SAA7191_REG_CTL4, reg);
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

/* I2C-interface */

static int saa7191_attach(struct i2c_adapter *adap, int addr, int kind)
{
      int err = 0;
      struct saa7191 *decoder;
      struct i2c_client *client;

      printk(KERN_INFO "Philips SAA7191 driver version %s\n",
             SAA7191_MODULE_VERSION);

      client = kzalloc(sizeof(*client), GFP_KERNEL);
      if (!client)
            return -ENOMEM;
      decoder = kzalloc(sizeof(*decoder), GFP_KERNEL);
      if (!decoder) {
            err = -ENOMEM;
            goto out_free_client;
      }

      client->addr = addr;
      client->adapter = adap;
      client->driver = &i2c_driver_saa7191;
      client->flags = 0;
      strcpy(client->name, "saa7191 client");
      i2c_set_clientdata(client, decoder);

      decoder->client = client;

      err = i2c_attach_client(client);
      if (err)
            goto out_free_decoder;

      err = saa7191_write_block(client, sizeof(initseq), initseq);
      if (err) {
            printk(KERN_ERR "SAA7191 initialization failed\n");
            goto out_detach_client;
      }

      printk(KERN_INFO "SAA7191 initialized\n");

      decoder->input = SAA7191_INPUT_COMPOSITE;
      decoder->norm = SAA7191_NORM_PAL;

      err = saa7191_autodetect_norm(client);
      if (err && (err != -EBUSY)) {
            printk(KERN_ERR "SAA7191: Signal auto-detection failed\n");
      }

      return 0;

out_detach_client:
      i2c_detach_client(client);
out_free_decoder:
      kfree(decoder);
out_free_client:
      kfree(client);
      return err;
}

static int saa7191_probe(struct i2c_adapter *adap)
{
      /* Always connected to VINO */
      if (adap->id == I2C_HW_SGI_VINO)
            return saa7191_attach(adap, SAA7191_ADDR, 0);
      /* Feel free to add probe here :-) */
      return -ENODEV;
}

static int saa7191_detach(struct i2c_client *client)
{
      struct saa7191 *decoder = i2c_get_clientdata(client);

      i2c_detach_client(client);
      kfree(decoder);
      kfree(client);
      return 0;
}

static int saa7191_command(struct i2c_client *client, unsigned int cmd,
                     void *arg)
{
      struct saa7191 *decoder = i2c_get_clientdata(client);

      switch (cmd) {
      case DECODER_GET_CAPABILITIES: {
            struct video_decoder_capability *cap = arg;

            cap->flags  = VIDEO_DECODER_PAL | VIDEO_DECODER_NTSC |
                        VIDEO_DECODER_SECAM | VIDEO_DECODER_AUTO;
            cap->inputs = (client->adapter->id == I2C_HW_SGI_VINO) ? 2 : 1;
            cap->outputs = 1;
            break;
      }
      case DECODER_GET_STATUS: {
            int *iarg = arg;
            u8 status;
            int res = 0;

            if (saa7191_read_status(client, &status)) {
                  return -EIO;
            }
            if ((status & SAA7191_STATUS_HLCK) == 0)
                  res |= DECODER_STATUS_GOOD;
            if (status & SAA7191_STATUS_CODE)
                  res |= DECODER_STATUS_COLOR;
            switch (decoder->norm) {
            case SAA7191_NORM_NTSC:
                  res |= DECODER_STATUS_NTSC;
                  break;
            case SAA7191_NORM_PAL:
                  res |= DECODER_STATUS_PAL;
                  break;
            case SAA7191_NORM_SECAM:
                  res |= DECODER_STATUS_SECAM;
                  break;
            case SAA7191_NORM_AUTO:
            default:
                  if (status & SAA7191_STATUS_FIDT)
                        res |= DECODER_STATUS_NTSC;
                  else
                        res |= DECODER_STATUS_PAL;
                  break;
            }
            *iarg = res;
            break;
      }
      case DECODER_SET_NORM: {
            int *iarg = arg;

            switch (*iarg) {
            case VIDEO_MODE_AUTO:
                  return saa7191_autodetect_norm(client);
            case VIDEO_MODE_PAL:
                  return saa7191_set_norm(client, SAA7191_NORM_PAL);
            case VIDEO_MODE_NTSC:
                  return saa7191_set_norm(client, SAA7191_NORM_NTSC);
            case VIDEO_MODE_SECAM:
                  return saa7191_set_norm(client, SAA7191_NORM_SECAM);
            default:
                  return -EINVAL;
            }
            break;
      }
      case DECODER_SET_INPUT: {
            int *iarg = arg;

            switch (client->adapter->id) {
            case I2C_HW_SGI_VINO:
                  return saa7191_set_input(client, *iarg);
            default:
                  if (*iarg != 0)
                        return -EINVAL;
            }
            break;
      }
      case DECODER_SET_OUTPUT: {
            int *iarg = arg;

            /* not much choice of outputs */
            if (*iarg != 0)
                  return -EINVAL;
            break;
      }
      case DECODER_ENABLE_OUTPUT: {
            /* Always enabled */
            break;
      }
      case DECODER_SET_PICTURE: {
            struct video_picture *pic = arg;
            unsigned val;
            int err;

            val = (pic->hue >> 8) - 0x80;

            err = saa7191_write_reg(client, SAA7191_REG_HUEC, val);
            if (err)
                  return -EIO;

            break;
      }
      case DECODER_SAA7191_GET_STATUS: {
            struct saa7191_status *status = arg;
            u8 status_reg;

            if (saa7191_read_status(client, &status_reg))
                  return -EIO;

            status->signal = ((status_reg & SAA7191_STATUS_HLCK) == 0)
                  ? 1 : 0;
            status->signal_60hz = (status_reg & SAA7191_STATUS_FIDT)
                  ? 1 : 0;
            status->color = (status_reg & SAA7191_STATUS_CODE) ? 1 : 0;

            status->input = decoder->input;
            status->norm = decoder->norm;

            break;
      }
      case DECODER_SAA7191_SET_NORM: {
            int *norm = arg;

            switch (*norm) {
            case SAA7191_NORM_AUTO:
                  return saa7191_autodetect_norm(client);
            case SAA7191_NORM_AUTO_EXT:
                  return saa7191_autodetect_norm_extended(client);
            default:
                  return saa7191_set_norm(client, *norm);
            }
      }
      case DECODER_SAA7191_GET_CONTROL: {
            return saa7191_get_control(client, arg);
      }
      case DECODER_SAA7191_SET_CONTROL: {
            return saa7191_set_control(client, arg);
      }
      default:
            return -EINVAL;
      }

      return 0;
}

static struct i2c_driver i2c_driver_saa7191 = {
      .driver = {
            .name       = "saa7191",
      },
      .id         = I2C_DRIVERID_SAA7191,
      .attach_adapter = saa7191_probe,
      .detach_client    = saa7191_detach,
      .command    = saa7191_command
};

static int saa7191_init(void)
{
      return i2c_add_driver(&i2c_driver_saa7191);
}

static void saa7191_exit(void)
{
      i2c_del_driver(&i2c_driver_saa7191);
}

module_init(saa7191_init);
module_exit(saa7191_exit);

Generated by  Doxygen 1.6.0   Back to index