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V4L/DVB (11342): au0828: better document i2c registers

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Change the #define entries for the i2c registers to be more meaningful, and
document the valid values for the registers.  Note that this changeset makes
*no* functional changes to the code.

Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2009-03-31 23:58:49 -03:00 committed by Mauro Carvalho Chehab
parent 3956fefc59
commit 9beb0de9ad
2 changed files with 69 additions and 28 deletions
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62
drivers/media/video/au0828/au0828-i2c.c
View File

@ -39,13 +39,15 @@ MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
{
struct au0828_dev *dev = i2c_adap->algo_data;
return au0828_read(dev, REG_201) & 0x08 ? 0 : 1;
return au0828_read(dev, AU0828_I2C_STATUS_201) &
AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1;
}
static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
{
struct au0828_dev *dev = i2c_adap->algo_data;
return au0828_read(dev, REG_201) & 0x02 ? 0 : 1;
return au0828_read(dev, AU0828_I2C_STATUS_201) &
AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1;
}
static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
@ -67,7 +69,8 @@ static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
{
struct au0828_dev *dev = i2c_adap->algo_data;
return au0828_read(dev, REG_201) & 0x01 ? 0 : 1;
return au0828_read(dev, AU0828_I2C_STATUS_201) &
AU0828_I2C_STATUS_READ_DONE ? 0 : 1;
}
static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
@ -89,7 +92,8 @@ static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
{
struct au0828_dev *dev = i2c_adap->algo_data;
return au0828_read(dev, REG_201) & 0x04 ? 1 : 0;
return au0828_read(dev, AU0828_I2C_STATUS_201) &
AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0;
}
static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
@ -111,7 +115,8 @@ static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
{
struct au0828_dev *dev = i2c_adap->algo_data;
return au0828_read(dev, REG_201) & 0x10 ? 1 : 0;
return au0828_read(dev, AU0828_I2C_STATUS_201) &
AU0828_I2C_STATUS_BUSY ? 1 : 0;
}
static int i2c_wait_done(struct i2c_adapter *i2c_adap)
@ -139,19 +144,21 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
dprintk(4, "%s()\n", __func__);
au0828_write(dev, REG_2FF, 0x01);
au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
/* FIXME: There is a problem with i2c communications with xc5000 that
requires us to slow down the i2c clock until we have a better
strategy (such as using the secondary i2c bus to do firmware
loading */
if ((msg->addr << 1) == 0xc2)
au0828_write(dev, REG_202, 0x40);
au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
AU0828_I2C_CLK_30KHZ);
else
au0828_write(dev, REG_202, 0x07);
au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
AU0828_I2C_CLK_250KHZ);
/* Hardware needs 8 bit addresses */
au0828_write(dev, REG_203, msg->addr << 1);
au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
dprintk(4, "SEND: %02x\n", msg->addr);
@ -163,7 +170,9 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
actual bytes to the bus, just do a read check. This is
consistent with how I saw i2c device checking done in the
USB trace of the Windows driver */
au0828_write(dev, REG_200, 0x20);
au0828_write(dev, AU0828_I2C_TRIGGER_200,
AU0828_I2C_TRIGGER_READ);
if (!i2c_wait_done(i2c_adap))
return -EIO;
@ -177,7 +186,7 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
dprintk(4, " %02x\n", msg->buf[i]);
au0828_write(dev, REG_205, msg->buf[i]);
au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]);
strobe++;
i++;
@ -186,9 +195,12 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
/* Strobe the byte into the bus */
if (i < msg->len)
au0828_write(dev, REG_200, 0x41);
au0828_write(dev, AU0828_I2C_TRIGGER_200,
AU0828_I2C_TRIGGER_WRITE |
AU0828_I2C_TRIGGER_HOLD);
else
au0828_write(dev, REG_200, 0x01);
au0828_write(dev, AU0828_I2C_TRIGGER_200,
AU0828_I2C_TRIGGER_WRITE);
/* Reset strobe trigger */
strobe = 0;
@ -216,25 +228,29 @@ static int i2c_readbytes(struct i2c_adapter *i2c_adap,
dprintk(4, "%s()\n", __func__);
au0828_write(dev, REG_2FF, 0x01);
au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
/* FIXME: There is a problem with i2c communications with xc5000 that
requires us to slow down the i2c clock until we have a better
strategy (such as using the secondary i2c bus to do firmware
loading */
if ((msg->addr << 1) == 0xc2)
au0828_write(dev, REG_202, 0x40);
au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
AU0828_I2C_CLK_30KHZ);
else
au0828_write(dev, REG_202, 0x07);
au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202,
AU0828_I2C_CLK_250KHZ);
/* Hardware needs 8 bit addresses */
au0828_write(dev, REG_203, msg->addr << 1);
au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
dprintk(4, " RECV:\n");
/* Deal with i2c_scan */
if (msg->len == 0) {
au0828_write(dev, REG_200, 0x20);
au0828_write(dev, AU0828_I2C_TRIGGER_200,
AU0828_I2C_TRIGGER_READ);
if (i2c_wait_read_ack(i2c_adap))
return -EIO;
return 0;
@ -245,14 +261,18 @@ static int i2c_readbytes(struct i2c_adapter *i2c_adap,
i++;
if (i < msg->len)
au0828_write(dev, REG_200, 0x60);
au0828_write(dev, AU0828_I2C_TRIGGER_200,
AU0828_I2C_TRIGGER_READ |
AU0828_I2C_TRIGGER_HOLD);
else
au0828_write(dev, REG_200, 0x20);
au0828_write(dev, AU0828_I2C_TRIGGER_200,
AU0828_I2C_TRIGGER_READ);
if (!i2c_wait_read_done(i2c_adap))
return -EIO;
msg->buf[i-1] = au0828_read(dev, REG_209) & 0xff;
msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) &
0xff;
dprintk(4, " %02x\n", msg->buf[i-1]);
}

35
drivers/media/video/au0828/au0828-reg.h
View File

@ -30,15 +30,36 @@
#define AU0828_SENSORCTRL_100 0x100
#define AU0828_SENSORCTRL_VBI_103 0x103
#define REG_200 0x200
#define REG_201 0x201
#define REG_202 0x202
#define REG_203 0x203
#define REG_205 0x205
#define REG_209 0x209
#define REG_2FF 0x2ff
/* I2C registers */
#define AU0828_I2C_TRIGGER_200 0x200
#define AU0828_I2C_STATUS_201 0x201
#define AU0828_I2C_CLK_DIVIDER_202 0x202
#define AU0828_I2C_DEST_ADDR_203 0x203
#define AU0828_I2C_WRITE_FIFO_205 0x205
#define AU0828_I2C_READ_FIFO_209 0x209
#define AU0828_I2C_MULTIBYTE_MODE_2FF 0x2ff
/* Audio registers */
#define AU0828_AUDIOCTRL_50C 0x50C
#define REG_600 0x600
/*********************************************************************/
/* Here are constants for values associated with the above registers */
/* I2C Trigger (Reg 0x200) */
#define AU0828_I2C_TRIGGER_WRITE 0x01
#define AU0828_I2C_TRIGGER_READ 0x20
#define AU0828_I2C_TRIGGER_HOLD 0x40
/* I2C Status (Reg 0x201) */
#define AU0828_I2C_STATUS_READ_DONE 0x01
#define AU0828_I2C_STATUS_NO_READ_ACK 0x02
#define AU0828_I2C_STATUS_WRITE_DONE 0x04
#define AU0828_I2C_STATUS_NO_WRITE_ACK 0x08
#define AU0828_I2C_STATUS_BUSY 0x10
/* I2C Clock Divider (Reg 0x202) */
#define AU0828_I2C_CLK_250KHZ 0x07
#define AU0828_I2C_CLK_100KHZ 0x14
#define AU0828_I2C_CLK_30KHZ 0x40