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[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>
This commit is contained in:
Antti Palosaari 2015-07-26 17:30:07 -03:00 committed by Mauro Carvalho Chehab
parent 59e8b7aa93
commit 433c486497
3 changed files with 21 additions and 4 deletions
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21
drivers/media/tuners/mt2060.c
View File

@ -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) {

3
drivers/media/tuners/mt2060.h
View File

@ -30,12 +30,15 @@ struct i2c_adapter;
* struct mt2060_platform_data - Platform data for the mt2060 driver
* @clock_out: Clock output setting. 0 = off, 1 = CLK/4, 2 = CLK/2, 3 = CLK/1.
* @if1: First IF used [MHz]. 0 defaults to 1220.
* @i2c_write_max: Maximum number of bytes I2C adapter can write at once.
* 0 defaults to maximum.
* @dvb_frontend: DVB frontend.
*/
struct mt2060_platform_data {
u8 clock_out;
u16 if1;
unsigned int i2c_write_max:5;
struct dvb_frontend *dvb_frontend;
};

1
drivers/media/tuners/mt2060_priv.h
View File

@ -94,6 +94,7 @@ struct mt2060_priv {
struct i2c_client *client;
struct mt2060_config config;
u8 i2c_max_regs;
u32 frequency;
u16 if1_freq;
u8 fmfreq;