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i2c: Add support for custom probe function

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The probe method used by i2c_new_probed_device() may not be suitable
for all cases. Let the caller provide its own, optional probe
function.

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 18:20:56 +02:00
parent f1c2e33c29
commit 9a94241afc
11 changed files with 31 additions and 21 deletions
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2
Documentation/i2c/instantiating-devices
View File

@ -102,7 +102,7 @@ static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
memset(&i2c_info, 0, sizeof(struct i2c_board_info));
strlcpy(i2c_info.name, "isp1301_pnx", I2C_NAME_SIZE);
isp1301_i2c_client = i2c_new_probed_device(i2c_adap, &i2c_info,
normal_i2c);
normal_i2c, NULL);
i2c_put_adapter(i2c_adap);
(...)
}

16
drivers/i2c/i2c-core.c
View File

@ -1464,14 +1464,18 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver)
struct i2c_client *
i2c_new_probed_device(struct i2c_adapter *adap,
struct i2c_board_info *info,
unsigned short const *addr_list)
unsigned short const *addr_list,
int (*probe)(struct i2c_adapter *, unsigned short addr))
{
int i;
/* Stop here if the bus doesn't support probing */
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) {
dev_err(&adap->dev, "Probing not supported\n");
return NULL;
if (!probe) {
/* Stop here if the bus doesn't support probing */
if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) {
dev_err(&adap->dev, "Probing not supported\n");
return NULL;
}
probe = i2c_default_probe;
}
for (i = 0; addr_list[i] != I2C_CLIENT_END; i++) {
@ -1490,7 +1494,7 @@ i2c_new_probed_device(struct i2c_adapter *adap,
}
/* Test address responsiveness */
if (i2c_default_probe(adap, addr_list[i]))
if (probe(adap, addr_list[i]))
break;
}

4
drivers/macintosh/therm_windtunnel.c
View File

@ -322,10 +322,10 @@ do_attach( struct i2c_adapter *adapter )
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, "therm_ds1775", I2C_NAME_SIZE);
i2c_new_probed_device(adapter, &info, scan_ds1775);
i2c_new_probed_device(adapter, &info, scan_ds1775, NULL);
strlcpy(info.type, "therm_adm1030", I2C_NAME_SIZE);
i2c_new_probed_device(adapter, &info, scan_adm1030);
i2c_new_probed_device(adapter, &info, scan_adm1030, NULL);
if( x.thermostat && x.fan ) {
x.running = 1;

2
drivers/media/video/bt8xx/bttv-i2c.c
View File

@ -411,7 +411,7 @@ void __devinit init_bttv_i2c_ir(struct bttv *btv)
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
i2c_new_probed_device(&btv->c.i2c_adap, &info, addr_list);
i2c_new_probed_device(&btv->c.i2c_adap, &info, addr_list, NULL);
}
}

3
drivers/media/video/cx18/cx18-i2c.c
View File

@ -117,7 +117,8 @@ static int cx18_i2c_new_ir(struct cx18 *cx, struct i2c_adapter *adap, u32 hw,
break;
}
return i2c_new_probed_device(adap, &info, addr_list) == NULL ? -1 : 0;
return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ?
-1 : 0;
}
int cx18_i2c_register(struct cx18 *cx, unsigned idx)

2
drivers/media/video/em28xx/em28xx-cards.c
View File

@ -2385,7 +2385,7 @@ void em28xx_register_i2c_ir(struct em28xx *dev)
if (dev->init_data.name)
info.platform_data = &dev->init_data;
i2c_new_probed_device(&dev->i2c_adap, &info, addr_list);
i2c_new_probed_device(&dev->i2c_adap, &info, addr_list, NULL);
}
void em28xx_card_setup(struct em28xx *dev)

9
drivers/media/video/ivtv/ivtv-i2c.c
View File

@ -183,8 +183,8 @@ static int ivtv_i2c_new_ir(struct ivtv *itv, u32 hw, const char *type, u8 addr)
return -1;
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, type, I2C_NAME_SIZE);
return i2c_new_probed_device(adap, &info, addr_list) == NULL
? -1 : 0;
return i2c_new_probed_device(adap, &info, addr_list, NULL)
== NULL ? -1 : 0;
}
/* Only allow one IR receiver to be registered per board */
@ -221,7 +221,8 @@ static int ivtv_i2c_new_ir(struct ivtv *itv, u32 hw, const char *type, u8 addr)
info.platform_data = init_data;
strlcpy(info.type, type, I2C_NAME_SIZE);
return i2c_new_probed_device(adap, &info, addr_list) == NULL ? -1 : 0;
return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ?
-1 : 0;
}
/* Instantiate the IR receiver device using probing -- undesirable */
@ -249,7 +250,7 @@ struct i2c_client *ivtv_i2c_new_ir_legacy(struct ivtv *itv)
memset(&info, 0, sizeof(struct i2c_board_info));
strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
return i2c_new_probed_device(&itv->i2c_adap, &info, addr_list);
return i2c_new_probed_device(&itv->i2c_adap, &info, addr_list, NULL);
}
int ivtv_i2c_register(struct ivtv *itv, unsigned idx)

3
drivers/media/video/v4l2-common.c
View File

@ -381,7 +381,8 @@ struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
/* Create the i2c client */
if (info->addr == 0 && probe_addrs)
client = i2c_new_probed_device(adapter, info, probe_addrs);
client = i2c_new_probed_device(adapter, info, probe_addrs,
NULL);
else
client = i2c_new_device(adapter, info);

2
drivers/usb/host/ohci-pnx4008.c
View File

@ -329,7 +329,7 @@ static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
memset(&i2c_info, 0, sizeof(struct i2c_board_info));
strlcpy(i2c_info.type, "isp1301_pnx", I2C_NAME_SIZE);
isp1301_i2c_client = i2c_new_probed_device(i2c_adap, &i2c_info,
normal_i2c);
normal_i2c, NULL);
i2c_put_adapter(i2c_adap);
if (!isp1301_i2c_client) {
err("failed to connect I2C to ISP1301 USB Transceiver");

2
drivers/video/matrox/i2c-matroxfb.c
View File

@ -191,7 +191,7 @@ static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
};
i2c_new_probed_device(&m2info->maven.adapter,
&maven_info, addr_list);
&maven_info, addr_list, NULL);
}
}
return m2info;

7
include/linux/i2c.h
View File

@ -284,12 +284,15 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
/* If you don't know the exact address of an I2C device, use this variant
* instead, which can probe for device presence in a list of possible
* addresses.
* addresses. The "probe" callback function is optional. If it is provided,
* it must return 1 on successful probe, 0 otherwise. If it is not provided,
* a default probing method is used.
*/
extern struct i2c_client *
i2c_new_probed_device(struct i2c_adapter *adap,
struct i2c_board_info *info,
unsigned short const *addr_list);
unsigned short const *addr_list,
int (*probe)(struct i2c_adapter *, unsigned short addr));
/* For devices that use several addresses, use i2c_new_dummy() to make
* client handles for the extra addresses.