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Date: Thu, 07 Jun 2012 16:38:09 +0800
From: Axel Lin <axel.lin@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Laxman Dewangan <ldewangan@...dia.com>, Liam Girdwood <lrg@...com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: rc5t583: Simplify rc5t583_set_voltage_time_sel
implementation
For linear mappings, we can use below equation to get the voltage difference
between new_selector and old_selector:
abs(new_selector - old_selector) * rdev->desc->uV_step
Signed-off-by: Axel Lin <axel.lin@...il.com>
---
drivers/regulator/rc5t583-regulator.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/drivers/regulator/rc5t583-regulator.c b/drivers/regulator/rc5t583-regulator.c
index 1d34e64..332eae8 100644
--- a/drivers/regulator/rc5t583-regulator.c
+++ b/drivers/regulator/rc5t583-regulator.c
@@ -70,18 +70,10 @@ static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector, unsigned int new_selector)
{
struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
- int old_uV, new_uV;
- old_uV = regulator_list_voltage_linear(rdev, old_selector);
- if (old_uV < 0)
- return old_uV;
-
- new_uV = regulator_list_voltage_linear(rdev, new_selector);
- if (new_uV < 0)
- return new_uV;
-
- return DIV_ROUND_UP(abs(old_uV - new_uV),
- reg->reg_info->change_uv_per_us);
+ return DIV_ROUND_UP(abs(new_selector - old_selector) *
+ rdev->desc->uV_step,
+ reg->reg_info->change_uv_per_us);
}
--
1.7.9.5
--
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