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[media] DiB0700: add function to change I2C-speed 

This commit adds a function to the DiB0700 USB driver which allows
drivers to change the I2C clock speed.

Signed-off-by: Olivier Grenie <olivier.grenie@dibcom.fr>
Signed-off-by: Patrick Boettcher <patrick.boettcher@dibcom.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
hifive-unleashed-5.1
Olivier Grenie 2011-01-03 15:30:14 -03:00 committed by Mauro Carvalho Chehab
parent f8e2e3eab8
commit 7757ddda6f
2 changed files with 40 additions and 4 deletions
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2
drivers/media/dvb/dvb-usb/dib0700.h
View File

@ -32,6 +32,7 @@ extern int dvb_usb_dib0700_debug;
// 1 Byte: 4MSB(1 = enable streaming, 0 = disable streaming) 4LSB(Video Mode: 0 = MPEG2 188Bytes, 1 = Analog)
// 2 Byte: MPEG2 mode: 4MSB(1 = Master Mode, 0 = Slave Mode) 4LSB(Channel 1 = bit0, Channel 2 = bit1)
// 2 Byte: Analog mode: 4MSB(0 = 625 lines, 1 = 525 lines) 4LSB( " " )
#define REQUEST_SET_I2C_PARAM 0x10
#define REQUEST_SET_RC 0x11
#define REQUEST_NEW_I2C_READ 0x12
#define REQUEST_NEW_I2C_WRITE 0x13
@ -61,6 +62,7 @@ extern struct i2c_algorithm dib0700_i2c_algo;
extern int dib0700_identify_state(struct usb_device *udev, struct dvb_usb_device_properties *props,
struct dvb_usb_device_description **desc, int *cold);
extern int dib0700_change_protocol(struct rc_dev *dev, u64 rc_type);
extern int dib0700_set_i2c_speed(struct dvb_usb_device *d, u16 scl_kHz);
extern int dib0700_device_count;
extern int dvb_usb_dib0700_ir_proto;

42
drivers/media/dvb/dvb-usb/dib0700_core.c
View File

@ -328,6 +328,30 @@ static int dib0700_set_clock(struct dvb_usb_device *d, u8 en_pll,
return dib0700_ctrl_wr(d, b, 10);
}
int dib0700_set_i2c_speed(struct dvb_usb_device *d, u16 scl_kHz)
{
u16 divider;
u8 b[8];
if (scl_kHz == 0)
return -EINVAL;
b[0] = REQUEST_SET_I2C_PARAM;
divider = (u16) (30000 / scl_kHz);
b[2] = (u8) (divider >> 8);
b[3] = (u8) (divider & 0xff);
divider = (u16) (72000 / scl_kHz);
b[4] = (u8) (divider >> 8);
b[5] = (u8) (divider & 0xff);
divider = (u16) (72000 / scl_kHz); /* clock: 72MHz */
b[6] = (u8) (divider >> 8);
b[7] = (u8) (divider & 0xff);
deb_info("setting I2C speed: %04x %04x %04x (%d kHz).", (b[2] << 8) | (b[3]), (b[4] << 8) | b[5], (b[6] << 8) | b[7], scl_kHz);
return dib0700_ctrl_wr(d, b, 8);
}
int dib0700_ctrl_clock(struct dvb_usb_device *d, u32 clk_MHz, u8 clock_out_gp3)
{
switch (clk_MHz) {
@ -459,10 +483,20 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
deb_info("modifying (%d) streaming state for %d\n", onoff, adap->id);
if (onoff)
st->channel_state |= 1 << adap->id;
else
st->channel_state &= ~(1 << adap->id);
st->channel_state &= ~0x3;
if ((adap->stream.props.endpoint != 2) && (adap->stream.props.endpoint != 3)) {
deb_info("the endpoint number (%i) is not correct, use the adapter id instead", adap->stream.props.endpoint);
if (onoff)
st->channel_state |= 1 << (adap->id);
else
st->channel_state |= 1 << ~(adap->id);
}
else {
if (onoff)
st->channel_state |= 1 << (adap->stream.props.endpoint-2);
else
st->channel_state |= 1 << (3-adap->stream.props.endpoint);
}
b[2] |= st->channel_state;