[Galaxy S Plus I9001 Android Development] oisis:
Don't forget? Wha do you mean? :) I remember but don't know about what? :)

EDIT1:

HAL wrapper form HTC:

- Logcat from camera:

V/CameraHolder( 2267): open camera 0
I/CameraService( 135): Opening camera 0
D/QualcommCameraHardware( 135): createInstance: E
D/QualcommCameraHardware( 135): Storing the current target type as 2
D/QualcommCameraHardware( 135): constructor EX
D/QualcommCameraHardware( 135): startCamera E
D/QualcommCameraHardware( 135): loading liboemcamera at 0xb000f16c
I/QualcommCameraHardware( 135): Set main cam and main cam only
I/mm-camera-mmap( 135): set sensor selection :0
I/mm-camera-config( 135): cam_conf fd cfgctrl.camfd:0
I/mm-camera-config( 135): Open config device node : /dev/msm_camera/config0
E/mm-camera-config( 135): cam_conf open driver failed: I/O error!

- Dmesg:

<6>[ 1.274078] [CAMDRV/CE147] ce147_init: E
<6>[ 1.274139] [CAMDRV/CE147] __ce147_probe: E
<4>[ 1.274200] [CAMDRV] config_camera_on_gpios
<6>[ 1.274993] [CAMDRV/CE147] ce147_sensor_probe: E
<6>[ 1.274993] [CAMDRV/CE147] ce147_i2c_probe: E
<4>[ 1.275024] [CAMDRV/CE147] ce147 i2c probe successful
<6>[ 1.275054] [CAMDRV/CE147] cam_pm_lp8720_probe: E
<4>[ 1.275054] [CAMDRV/CE147] lp8720 i2c probe successful
<3>[ 1.280212] [CAMDRV/CE147] ce147_set_power: POWER ON.
<3>[ 1.303222] [CAMDRV/CE147] ce147_set_power: POWER CONTROL END.
<4>[ 1.303222] [CAMDRV/CE147] ce147_load_fw START
<4>[ 2.010955] [CAMDRV/CE147] ce147_load_fw END
<3>[ 2.011352] [CAMDRV/CE147] ce147_set_power: POWER OFF.
<3>[ 2.016937] [CAMDRV/CE147] ce147_set_power: POWER CONTROL END.
<4>[ 2.016937] [CAMDRV/CE147] ce147 sensor probe successful
<4>[ 2.016937] [CAMDRV] config_camera_off_gpios
<6>[ 2.018798] [CAMDRV/S5KA3DFX] s5ka3dfx_init: E
<4>[ 2.018859] [CAMDRV] config_camera_on_gpios
<3>[ 2.020416] [CAMDRV/S5KA3DFX] s5ka3dfx_sensor_probe E
<3>[ 2.020416] [CAMDRV/S5KA3DFX] s5ka3dfx_i2c_init E
<3>[ 2.020446] [CAMDRV/S5KA3DFX] s5ka3dfx_i2c_probe E
<3>[ 2.020446] [CAMDRV/S5KA3DFX] s5ka3dfx_i2c_probe X
<3>[ 2.025604] [CAMDRV/S5KA3DFX] S5KA3DFX sensor probe successful
<4>[ 2.025604] [CAMDRV] config_camera_off_gpios
<4>[ 150.675170] [CAMDRV] config_camera_on_gpios
<4>[ 150.677001] [CAMDRV/CE147] ce147_sensor_init
<3>[ 150.761718] [CAMDRV/CE147] ce147_set_power: POWER ON.
<3>[ 150.807373] [CAMDRV/CE147] ce147_set_power: POWER CONTROL END.
<4>[ 150.807373] [CAMDRV/CE147] ce147_load_fw START
<4>[ 151.511779] [CAMDRV/CE147] ce147_load_fw END
<3>[ 151.513183] [CAMDRV/CE147] CE147 :fail : read main_sw_version
<3>[ 151.513214] [CAMDRV/CE147] CE147 :ce147_sensor_init_probe: Failed: Reading Main SW Version
<4>[ 151.513305] [CAMDRV] config_camera_off_gpios

EDIT2:

Some next tests:

ls -al /proc/video*
crw-rw---- system camera 81, 0 2012-05-17 20:25 video20

So we don't have permissions, but can have :):

chmod 666 /dev/video20

Camera start, dmesg:

<6>[ 1.274078] [CAMDRV/CE147] ce147_init: E
<6>[ 1.274139] [CAMDRV/CE147] __ce147_probe: E
<4>[ 1.274200] [CAMDRV] config_camera_on_gpios
<6>[ 1.274993] [CAMDRV/CE147] ce147_sensor_probe: E
<6>[ 1.274993] [CAMDRV/CE147] ce147_i2c_probe: E
<4>[ 1.275024] [CAMDRV/CE147] ce147 i2c probe successful
<6>[ 1.275054] [CAMDRV/CE147] cam_pm_lp8720_probe: E
<4>[ 1.275054] [CAMDRV/CE147] lp8720 i2c probe successful
<3>[ 1.280212] [CAMDRV/CE147] ce147_set_power: POWER ON.
<3>[ 1.303222] [CAMDRV/CE147] ce147_set_power: POWER CONTROL END.
<4>[ 1.303222] [CAMDRV/CE147] ce147_load_fw START
<4>[ 2.010955] [CAMDRV/CE147] ce147_load_fw END
<3>[ 2.011352] [CAMDRV/CE147] ce147_set_power: POWER OFF.
<3>[ 2.016937] [CAMDRV/CE147] ce147_set_power: POWER CONTROL END.
<4>[ 2.016937] [CAMDRV/CE147] ce147 sensor probe successful
<4>[ 2.016937] [CAMDRV] config_camera_off_gpios
<6>[ 2.018798] [CAMDRV/S5KA3DFX] s5ka3dfx_init: E
<4>[ 2.018859] [CAMDRV] config_camera_on_gpios
<3>[ 2.020416] [CAMDRV/S5KA3DFX] s5ka3dfx_sensor_probe E
<3>[ 2.020416] [CAMDRV/S5KA3DFX] s5ka3dfx_i2c_init E
<3>[ 2.020446] [CAMDRV/S5KA3DFX] s5ka3dfx_i2c_probe E
<3>[ 2.020446] [CAMDRV/S5KA3DFX] s5ka3dfx_i2c_probe X
<3>[ 2.025604] [CAMDRV/S5KA3DFX] S5KA3DFX sensor probe successful
<4>[ 2.025604] [CAMDRV] config_camera_off_gpios
<4>[ 150.675170] [CAMDRV] config_camera_on_gpios
<4>[ 150.677001] [CAMDRV/CE147] ce147_sensor_init
<3>[ 150.761718] [CAMDRV/CE147] ce147_set_power: POWER ON.
<3>[ 150.807373] [CAMDRV/CE147] ce147_set_power: POWER CONTROL END.
<4>[ 150.807373] [CAMDRV/CE147] ce147_load_fw START
<4>[ 151.511779] [CAMDRV/CE147] ce147_load_fw END
<3>[ 151.513183] [CAMDRV/CE147] CE147 :fail : read main_sw_version
<3>[ 151.513214] [CAMDRV/CE147] CE147 :ce147_sensor_init_probe: Failed: Reading Main SW Version
<4>[ 151.513305] [CAMDRV] config_camera_off_gpios

Still testing :).