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backlight: jornada720: Minimise code duplication and handle errors better

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Rickard Strandqvi's ran a code analysis application which found that
jornada_lcd_get_contrast(() and jornada_lcd_set_contrast() contained
some code duplication (calling the same functions during various
code execution paths) and failed to return errors in a consistent
manner.  This patch aims to simplify the code, coercing it into
behaving at a level expected of a driver in the Linux kernel.

Suggested-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lee Jones 2014-07-10 09:07:06 +01:00
parent b3de3402e5
commit 1e3b097012
1 changed files with 19 additions and 18 deletions
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35
drivers/video/backlight/jornada720_lcd.c
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@ -43,37 +43,38 @@ static int jornada_lcd_get_contrast(struct lcd_device *ld)
jornada_ssp_start(); jornada_ssp_start();
if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) { if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
dev_err(&ld->dev, "get contrast failed\n");
jornada_ssp_end();
return -ETIMEDOUT;
} else {
ret = jornada_ssp_byte(TXDUMMY); ret = jornada_ssp_byte(TXDUMMY);
goto success;
}
dev_err(&ld->dev, "failed to set contrast\n");
ret = -ETIMEDOUT;
success:
jornada_ssp_end(); jornada_ssp_end();
return ret; return ret;
}
} }
static int jornada_lcd_set_contrast(struct lcd_device *ld, int value) static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
{ {
int ret; int ret = 0;
jornada_ssp_start(); jornada_ssp_start();
/* start by sending our set contrast cmd to mcu */ /* start by sending our set contrast cmd to mcu */
ret = jornada_ssp_byte(SETCONTRAST); if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
/* if successful push the new value */
/* push the new value */ if (jornada_ssp_byte(value) == TXDUMMY)
if (jornada_ssp_byte(value) != TXDUMMY) { goto success;
dev_err(&ld->dev, "set contrast failed\n");
jornada_ssp_end();
return -ETIMEDOUT;
} }
/* if we get here we can assume everything went well */ dev_err(&ld->dev, "failed to set contrast\n");
jornada_ssp_end(); ret = -ETIMEDOUT;
return 0; success:
jornada_ssp_end();
return ret;
} }
static int jornada_lcd_set_power(struct lcd_device *ld, int power) static int jornada_lcd_set_power(struct lcd_device *ld, int power)