From 8678b03428b6894d146695980f04f26af7b9b3ec Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Wed, 10 Apr 2013 10:50:50 -0300 Subject: [PATCH] [media] r820t: split the function that read cached regs As we'll need to retrieve cached registers, make this function explicit. Signed-off-by: Mauro Carvalho Chehab Tested-by: Antti Palosaari --- drivers/media/tuners/r820t.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/media/tuners/r820t.c b/drivers/media/tuners/r820t.c index d5686e8a8bc6..ef100ab3564d 100644 --- a/drivers/media/tuners/r820t.c +++ b/drivers/media/tuners/r820t.c @@ -402,15 +402,25 @@ static int r820t_write_reg(struct r820t_priv *priv, u8 reg, u8 val) return r820t_write(priv, reg, &val, 1); } -static int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val, - u8 bit_mask) +static int r820t_read_cache_reg(struct r820t_priv *priv, int reg) { - int r = reg - REG_SHADOW_START; + reg -= REG_SHADOW_START; - if (r >= 0 && r < NUM_REGS) - val = (priv->regs[r] & ~bit_mask) | (val & bit_mask); + if (reg >= 0 && reg < NUM_REGS) + return priv->regs[reg]; else return -EINVAL; +} + +static int r820t_write_reg_mask(struct r820t_priv *priv, u8 reg, u8 val, + u8 bit_mask) +{ + int rc = r820t_read_cache_reg(priv, reg); + + if (rc < 0) + return rc; + + val = (rc & ~bit_mask) | (val & bit_mask); return r820t_write(priv, reg, &val, 1); } -- 2.39.5