diff options
| author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-12-22 19:18:27 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-12-30 14:39:27 +0300 |
| commit | 531c98e71805b32e9ea35a218119100bbd2b7615 (patch) | |
| tree | 548f878b2d4abd66bee8d0fa0b19eeb9cf3182c9 | |
| parent | 4b00eb25340c1a9b9eedaf0bc5b0f0d18eddb028 (diff) | |
| download | linux-531c98e71805b32e9ea35a218119100bbd2b7615.tar.xz | |
V4L/DVB (9953): em28xx: Add suport for debugging AC97 anciliary chips
The em28xx driver can be coupled to an anciliary AC97 chip. This patch
allows read/write AC97 registers directly.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-core.c | 4 | ||||
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-video.c | 19 | ||||
| -rw-r--r-- | drivers/media/video/em28xx/em28xx.h | 3 | ||||
| -rw-r--r-- | include/linux/videodev2.h | 1 |
4 files changed, 25 insertions, 2 deletions
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c index c647dcb20a57..5964998daf2e 100644 --- a/drivers/media/video/em28xx/em28xx-core.c +++ b/drivers/media/video/em28xx/em28xx-core.c @@ -259,7 +259,7 @@ static int em28xx_is_ac97_ready(struct em28xx *dev) * em28xx_read_ac97() * write a 16 bit value to the specified AC97 address (LSB first!) */ -static int em28xx_read_ac97(struct em28xx *dev, u8 reg) +int em28xx_read_ac97(struct em28xx *dev, u8 reg) { int ret; u8 addr = (reg & 0x7f) | 0x80; @@ -285,7 +285,7 @@ static int em28xx_read_ac97(struct em28xx *dev, u8 reg) * em28xx_write_ac97() * write a 16 bit value to the specified AC97 address (LSB first!) */ -static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val) +int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val) { int ret; u8 addr = reg & 0x7f; diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c index 4701b6589b10..4ea4920c927a 100644 --- a/drivers/media/video/em28xx/em28xx-video.c +++ b/drivers/media/video/em28xx/em28xx-video.c @@ -1221,6 +1221,17 @@ static int vidioc_g_register(struct file *file, void *priv, struct em28xx *dev = fh->dev; int ret; + if (reg->match_type == V4L2_CHIP_MATCH_AC97) { + mutex_lock(&dev->lock); + ret = em28xx_read_ac97(dev, reg->reg); + mutex_unlock(&dev->lock); + if (ret < 0) + return ret; + + reg->val = ret; + return 0; + } + if (!v4l2_chip_match_host(reg->match_type, reg->match_chip)) return -EINVAL; @@ -1256,6 +1267,14 @@ static int vidioc_s_register(struct file *file, void *priv, __le64 buf; int rc; + if (reg->match_type == V4L2_CHIP_MATCH_AC97) { + mutex_lock(&dev->lock); + rc = em28xx_write_ac97(dev, reg->reg, reg->val); + mutex_unlock(&dev->lock); + + return rc; + } + buf = cpu_to_le64(reg->val); mutex_lock(&dev->lock); diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h index 80d1d55d80f9..100f27819cdc 100644 --- a/drivers/media/video/em28xx/em28xx.h +++ b/drivers/media/video/em28xx/em28xx.h @@ -564,6 +564,9 @@ int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf, int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len); int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val); +int em28xx_read_ac97(struct em28xx *dev, u8 reg); +int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val); + int em28xx_audio_analog_set(struct em28xx *dev); int em28xx_audio_setup(struct em28xx *dev); diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h index 754c8d9685a4..e31144d22237 100644 --- a/include/linux/videodev2.h +++ b/include/linux/videodev2.h @@ -1376,6 +1376,7 @@ struct v4l2_streamparm { #define V4L2_CHIP_MATCH_HOST 0 /* Match against chip ID on host (0 for the host) */ #define V4L2_CHIP_MATCH_I2C_DRIVER 1 /* Match against I2C driver ID */ #define V4L2_CHIP_MATCH_I2C_ADDR 2 /* Match against I2C 7-bit address */ +#define V4L2_CHIP_MATCH_AC97 3 /* Match against anciliary AC97 chip */ struct v4l2_register { __u32 match_type; /* Match type */ |