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V4L/DVB: Use custom I2C probing function mechanism

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Now that i2c-core offers the possibility to provide custom probing
function for I2C devices, let's make use of it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jean Delvare 2010-08-11 18:20:57 +02:00
parent 9a94241afc
commit d44f19d586
4 changed files with 18 additions and 26 deletions
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7
drivers/i2c/i2c-core.c
View file

@ -1461,6 +1461,13 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver)
return err;
}
int i2c_probe_func_quick_read(struct i2c_adapter *adap, unsigned short addr)
{
return i2c_smbus_xfer(adap, addr, 0, I2C_SMBUS_READ, 0,
I2C_SMBUS_QUICK, NULL) >= 0;
}
EXPORT_SYMBOL_GPL(i2c_probe_func_quick_read);
struct i2c_client *
i2c_new_probed_device(struct i2c_adapter *adap,
struct i2c_board_info *info,

15
drivers/media/video/cx23885/cx23885-i2c.c
View file

@ -364,17 +364,10 @@ int cx23885_i2c_register(struct cx23885_i2c *bus)
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
/*
* We can't call i2c_new_probed_device() because it uses
* quick writes for probing and the IR receiver device only
* replies to reads.
*/
if (i2c_smbus_xfer(&bus->i2c_adap, addr_list[0], 0,
I2C_SMBUS_READ, 0, I2C_SMBUS_QUICK,
NULL) >= 0) {
info.addr = addr_list[0];
i2c_new_device(&bus->i2c_adap, &info);
}
/* Use quick read command for probe, some IR chips don't
* support writes */
i2c_new_probed_device(&bus->i2c_adap, &info, addr_list,
i2c_probe_func_quick_read);
}
return bus->i2c_rc;

19
drivers/media/video/cx88/cx88-i2c.c
View file

@ -193,24 +193,13 @@ void cx88_i2c_init_ir(struct cx88_core *core)
0x18, 0x6b, 0x71,
I2C_CLIENT_END
};
const unsigned short *addrp;
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
/*
* We can't call i2c_new_probed_device() because it uses
* quick writes for probing and at least some R receiver
* devices only reply to reads.
*/
for (addrp = addr_list; *addrp != I2C_CLIENT_END; addrp++) {
if (i2c_smbus_xfer(&core->i2c_adap, *addrp, 0,
I2C_SMBUS_READ, 0,
I2C_SMBUS_QUICK, NULL) >= 0) {
info.addr = *addrp;
i2c_new_device(&core->i2c_adap, &info);
break;
}
}
/* Use quick read command for probe, some IR chips don't
* support writes */
i2c_new_probed_device(&core->i2c_adap, &info, addr_list,
i2c_probe_func_quick_read);
}
}

3
include/linux/i2c.h
View file

@ -294,6 +294,9 @@ i2c_new_probed_device(struct i2c_adapter *adap,
unsigned short const *addr_list,
int (*probe)(struct i2c_adapter *, unsigned short addr));
/* Common custom probe functions */
extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr);
/* For devices that use several addresses, use i2c_new_dummy() to make
* client handles for the extra addresses.
*/