diff options
| author | Sascha Sommer <saschasommer@freenet.de> | 2005-11-08 21:38:10 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-09 07:56:24 -0800 |
| commit | 52c02fcd00cf6fb6f5b2c8beae3b283c63cf1210 (patch) | |
| tree | 575ef8bbbc7cd82ac9a129563fd2445d46ed7c2e /drivers/media/video/em28xx/em28xx-core.c | |
| parent | 07345f5d6a92bc1184ca8b05069ec1cd3514fe11 (diff) | |
[PATCH] v4l: 850: update em2800 scaler code and comments based on info from empiatech
- Update em2800 scaler code and comments based on info from empiatech
Signed-off-by: Sascha Sommer <saschasommer@freenet.de>
Signed-off-by: Markus Rechberger <mrechberger@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-core.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-core.c | 38 |
1 files changed, 15 insertions, 23 deletions
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c index ba2d986c6df..263b6c91adb 100644 --- a/drivers/media/video/em28xx/em28xx-core.c +++ b/drivers/media/video/em28xx/em28xx-core.c @@ -430,30 +430,22 @@ int em2820_capture_area_set(struct em2820 *dev, u8 hstart, u8 vstart, int em2820_scaler_set(struct em2820 *dev, u16 h, u16 v) { - u8 buf[2]; - buf[0] = h; - buf[1] = h >> 8; - em2820_write_regs(dev, HSCALELOW_REG, (char *)buf, 2); - buf[0] = v; - buf[1] = v >> 8; - em2820_write_regs(dev, VSCALELOW_REG, (char *)buf, 2); - if(dev->is_em2800){ - /* FIXME */ - /* random ratio scaling and 720x567 doesn't seem to work */ - /* the maximum we can get is 640x480 with disabled scaler */ - /* and norm_maxw set to 640 */ - if(dev->width == 640 && dev->height == 480) - return em2820_write_regs(dev, COMPR_REG,"\x00",1); - if(dev->height > 288) - return em2820_write_regs(dev, COMPR_REG,"\x10",1); - if(dev->width > 360) - return em2820_write_regs(dev, COMPR_REG,"\x20",1); + u8 mode; + /* the em2800 scaler only supports scaling down to 50% */ + if(dev->is_em2800) + mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00); + else { + u8 buf[2]; + buf[0] = h; + buf[1] = h >> 8; + em2820_write_regs(dev, HSCALELOW_REG, (char *)buf, 2); + buf[0] = v; + buf[1] = v >> 8; + em2820_write_regs(dev, VSCALELOW_REG, (char *)buf, 2); + /* it seems that both H and V scalers must be active to work correctly */ + mode = (h || v)? 0x30: 0x00; } - /* when H and V mixershould be used? */ - /* return em2820_write_reg_bits(dev, COMPR_REG, (h ? 0x20 : 0x00) | (v ? 0x10 : 0x00), 0x30); */ - /* it seems that both H and V scalers must be active to work correctly */ - return em2820_write_reg_bits(dev, COMPR_REG, h - || v ? 0x30 : 0x00, 0x30); + return em2820_write_reg_bits(dev, COMPR_REG, mode, 0x30); } /* FIXME: this only function read values from dev */ |