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V4L/DVB (5423): M920x: i2c cleanups
- Implement m920x i2c as suggested by Pierre Willenbrock - remove "magic" hack - r/w bit is not part of the i2c address - move hardware remarks to header file Signed-off-by: Aapo Tahkola <aet@rasterburn.org> Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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fee73165ee
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2 changed files with 52 additions and 51 deletions
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@ -137,52 +137,45 @@ static int m9206_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
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int num)
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{
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struct dvb_usb_device *d = i2c_get_adapdata(adap);
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struct m9206_state *m = d->priv;
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int i;
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int i, j;
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int ret = 0;
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if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
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return -EAGAIN;
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if (num > 2)
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return -EINVAL;
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for (i = 0; i < num; i++) {
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if ((ret = m9206_write(d->udev, M9206_I2C, msg[i].addr, 0x80)) != 0)
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goto unlock;
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if (msg[i].flags & I2C_M_RD) {
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if ((ret = m9206_write(d->udev, M9206_I2C, msg[i].buf[0], 0x0)) != 0)
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goto unlock;
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if (i + 1 < num && msg[i + 1].flags & I2C_M_RD) {
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int i2c_i;
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for (i2c_i = 0; i2c_i < M9206_I2C_MAX; i2c_i++)
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if (msg[i].addr == m->i2c_r[i2c_i].addr)
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break;
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if (i2c_i >= M9206_I2C_MAX) {
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deb_rc("No magic for i2c addr!\n");
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ret = -EINVAL;
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if ((ret = m9206_write(d->udev, M9206_I2C, (msg[i].addr << 1) | 0x01, 0x80)) != 0)
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goto unlock;
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for(j = 0; j < msg[i].len; j++) {
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if (j + 1 == msg[i].len && i + 1== num) {
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if ((ret = m9206_read(d->udev, M9206_I2C, 0x0, 0x60, &msg[i].buf[j], msg[i].len)) != 0)
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goto unlock;
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} else {
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if ((ret = m9206_read(d->udev, M9206_I2C, 0x0, 0x21, &msg[i].buf[j], msg[i].len)) != 0)
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goto unlock;
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}
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}
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if ((ret = m9206_write(d->udev, M9206_I2C, m->i2c_r[i2c_i].magic, 0x80)) != 0)
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goto unlock;
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if ((ret = m9206_read(d->udev, M9206_I2C, 0x0, 0x60, msg[i + 1].buf, msg[i + 1].len)) != 0)
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goto unlock;
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i++;
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} else {
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if (msg[i].len != 2)
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return -EINVAL;
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if ((ret = m9206_write(d->udev, M9206_I2C, msg[i].buf[1], 0x40)) != 0)
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if ((ret = m9206_write(d->udev, M9206_I2C, msg[i].addr << 1, 0x80)) != 0)
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goto unlock;
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for(j = 0; j < msg[i].len; j++) {
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if (j + 1 == msg[i].len && i + 1== num) {
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if ((ret = m9206_write(d->udev, M9206_I2C, msg[i].buf[j], 0x40)) != 0)
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goto unlock;
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} else {
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if ((ret = m9206_write(d->udev, M9206_I2C, msg[i].buf[j], 0x0)) != 0)
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goto unlock;
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}
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}
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}
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}
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ret = i;
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ret = num;
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unlock:
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mutex_unlock(&d->i2c_mutex);
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@ -381,20 +374,15 @@ static int megasky_mt352_demod_init(struct dvb_frontend *fe)
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}
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static struct mt352_config megasky_mt352_config = {
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.demod_address = 0x1e,
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.demod_address = 0x0f,
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.no_tuner = 1,
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.demod_init = megasky_mt352_demod_init,
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};
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static int megasky_mt352_frontend_attach(struct dvb_usb_adapter *adap)
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{
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struct m9206_state *m = adap->dev->priv;
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deb_rc("megasky_frontend_attach!\n");
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m->i2c_r[M9206_I2C_DEMOD].addr = megasky_mt352_config.demod_address;
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m->i2c_r[M9206_I2C_DEMOD].magic = 0x1f;
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if ((adap->fe = dvb_attach(mt352_attach, &megasky_mt352_config, &adap->dev->i2c_adap)) == NULL)
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return -EIO;
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@ -402,16 +390,11 @@ static int megasky_mt352_frontend_attach(struct dvb_usb_adapter *adap)
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}
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static struct qt1010_config megasky_qt1010_config = {
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.i2c_address = 0xc4
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.i2c_address = 0x62
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};
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static int megasky_qt1010_tuner_attach(struct dvb_usb_adapter *adap)
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{
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struct m9206_state *m = adap->dev->priv;
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m->i2c_r[M9206_I2C_TUNER].addr = megasky_qt1010_config.i2c_address;
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m->i2c_r[M9206_I2C_TUNER].magic = 0xc5;
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if (dvb_attach(qt1010_attach, adap->fe, &adap->dev->i2c_adap,
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&megasky_qt1010_config) == NULL)
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return -ENODEV;
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@ -19,17 +19,35 @@
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#define M9206_MAX_FILTERS 8
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#define M9206_I2C_TUNER 0
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#define M9206_I2C_DEMOD 1
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#define M9206_I2C_MAX 2
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/*
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sequences found in logs:
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[index value]
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0x80 write addr
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(0x00 out byte)*
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0x40 out byte
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0x80 write addr
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(0x00 out byte)*
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0x80 read addr
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(0x21 in byte)*
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0x60 in byte
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this sequence works:
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0x80 read addr
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(0x21 in byte)*
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0x60 in byte
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_my guess_:
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0x80: begin i2c transfer using address. value=address<<1|(reading?1:0)
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0x00: write byte
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0x21: read byte, more to follow
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0x40: write last byte of message sequence
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0x60: read last byte of message sequence
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*/
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struct m9206_state {
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u16 filters[M9206_MAX_FILTERS];
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int filtering_enabled;
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int rep_count;
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struct {
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unsigned char addr;
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unsigned char magic;
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}i2c_r[M9206_I2C_MAX];
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};
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#endif
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