The current code provides a helper function em28xx_write_reg_bits() that reads
the current state/value of a GPIO register, modifies only the bits specified
with the value and bitmask parmaters and writes the new value back to the
register.
Newer devices (em25xx, em276x/7x/8x) are using separate registers for reading
and changing the states of the GPIO ports/lines, for which this helper function
cannot be used.
Introduce a new function em28xx_write_regs_bits() that uses two register
parameters reg_r (register for reading the current value) and
reg_w (register for writing the new value).
Make em28xx_write_reg_bits() a wrapper function calling this new function with
the same value for both registers.
Signed-off-by: Frank Schäfer <fschaefer.oss@xxxxxxxxxxxxxx>
---
drivers/media/usb/em28xx/em28xx-core.c | 26 +++++++++++++++++++-------
drivers/media/usb/em28xx/em28xx.h | 5 +++--
2 Dateien geändert, 22 Zeilen hinzugefügt(+), 9 Zeilen entfernt(-)
diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c
index fc157af..293dc31 100644
--- a/drivers/media/usb/em28xx/em28xx-core.c
+++ b/drivers/media/usb/em28xx/em28xx-core.c
@@ -205,23 +205,35 @@ int em28xx_write_reg(struct em28xx *dev, u16 reg, u8 val)
EXPORT_SYMBOL_GPL(em28xx_write_reg);
/*
- * em28xx_write_reg_bits()
- * sets only some bits (specified by bitmask) of a register, by first reading
- * the actual value
+ * em28xx_write_regs_bits()
+ * reads value from a register, modifies only the bits specified with the value
+ * and bitmask parameters and writes the new value two a second register.
*/
-int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
- u8 bitmask)
+int em28xx_write_regs_bits(struct em28xx *dev, u16 reg_r, u16 reg_w, u8 val,
+ u8 bitmask)
{
int oldval;
u8 newval;
- oldval = em28xx_read_reg(dev, reg);
+ oldval = em28xx_read_reg(dev, reg_r);
if (oldval < 0)
return oldval;
newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
- return em28xx_write_regs(dev, reg, &newval, 1);
+ return em28xx_write_regs(dev, reg_w, &newval, 1);
+}
+EXPORT_SYMBOL_GPL(em28xx_write_regs_bits);
+
+/*
+ * em28xx_write_reg_bits()
+ * modifies only the bits specified with the value and bitmask parameters of
+ * a register
+ */
+int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
+ u8 bitmask)
+{
+ return em28xx_write_regs_bits(dev, reg, reg, val, bitmask);
}
EXPORT_SYMBOL_GPL(em28xx_write_reg_bits);
diff --git a/drivers/media/usb/em28xx/em28xx.h b/drivers/media/usb/em28xx/em28xx.h
index e070de0..a817c3d 100644
--- a/drivers/media/usb/em28xx/em28xx.h
+++ b/drivers/media/usb/em28xx/em28xx.h
@@ -667,8 +667,9 @@ int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
int len);
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_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
- u8 bitmask);
+int em28xx_write_regs_bits(struct em28xx *dev, u16 reg_r, u16 reg_w,
+ u8 val, u8 bitmask);
+int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val, u8 bitmask);
int em28xx_read_ac97(struct em28xx *dev, u8 reg);
int em28xx_write_ac97(struct em28xx *dev, u8 reg, u16 val);
--
1.7.10.4
--
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