diff options
| author |   Antti Palosaari <crope@iki.fi> | 2015-07-26 17:30:07 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-02-03 06:44:03 -0200 |
| commit | 433c4864977a943eabea737f2f0894430795eca3 (patch) | |
| tree | c286ceb23d6285f781caf5e49fa8daa163307dcf /drivers/media/tuners/mt2060.c | |
| parent | [media] mt2060: add i2c bindings (diff) | |
| download | linux-dev-433c4864977a943eabea737f2f0894430795eca3.tar.xz linux-dev-433c4864977a943eabea737f2f0894430795eca3.zip | |
[media] mt2060: add param to split long i2c writes
Add configuration parameter to split long i2c writes as some I2C
adapters cannot write 10 bytes used as a one go.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/tuners/mt2060.c')
| -rw-r--r-- | drivers/media/tuners/mt2060.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/drivers/media/tuners/mt2060.c b/drivers/media/tuners/mt2060.c index b8acfa27e842..14f5935f8898 100644 --- a/drivers/media/tuners/mt2060.c +++ b/drivers/media/tuners/mt2060.c @@ -67,13 +67,24 @@ static int mt2060_writereg(struct mt2060_priv *priv, u8 reg, u8 val) // Writes a set of consecutive registers static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len) { + int rem, val_len; + u8 xfer_buf[16]; struct i2c_msg msg = { - .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len + .addr = priv->cfg->i2c_address, .flags = 0, .buf = xfer_buf }; - if (i2c_transfer(priv->i2c, &msg, 1) != 1) { - printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n",(int)len); - return -EREMOTEIO; + + for (rem = len - 1; rem > 0; rem -= priv->i2c_max_regs) { + val_len = min_t(int, rem, priv->i2c_max_regs); + msg.len = 1 + val_len; + xfer_buf[0] = buf[0] + len - 1 - rem; + memcpy(&xfer_buf[1], &buf[1 + len - 1 - rem], val_len); + + if (i2c_transfer(priv->i2c, &msg, 1) != 1) { + printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n", val_len); + return -EREMOTEIO; + } } + return 0; } @@ -365,6 +376,7 @@ struct dvb_frontend * mt2060_attach(struct dvb_frontend *fe, struct i2c_adapter priv->cfg = cfg; priv->i2c = i2c; priv->if1_freq = if1; + priv->i2c_max_regs = ~0; if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */ @@ -422,6 +434,7 @@ static int mt2060_probe(struct i2c_client *client, dev->i2c = client->adapter; dev->if1_freq = pdata->if1 ? pdata->if1 : 1220; dev->client = client; + dev->i2c_max_regs = pdata->i2c_write_max ? pdata->i2c_write_max - 1 : ~0; ret = mt2060_readreg(dev, REG_PART_REV, &chip_id); if (ret) { |