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From: Lars-Peter Clausen <lars@metafoo.de>
To: Anton Vorontsov <cbouatmailru@gmail.com>
Cc: "Rodolfo Giometti" <giometti@linux.it>,
	"Grazvydas Ignotas" <notasas@gmail.com>,
	linux-kernel@vger.kernel.org, "Pali Rohár" <pali.rohar@gmail.com>,
	"Lars-Peter Clausen" <lars@metafoo.de>
Subject: [PATCH 03/14] bq27x00: Fix CURRENT_NOW property
Date: Sat, 12 Feb 2011 20:39:02 +0100	[thread overview]
Message-ID: <1297539554-13957-4-git-send-email-lars@metafoo.de> (raw)
In-Reply-To: <1297539554-13957-1-git-send-email-lars@metafoo.de>

From: Pali Rohár <pali.rohar@gmail.com>

According to the bq27000 datasheet the current should be calculated by
the following formula:
    current = AI * 3570 / 20

This patch adjust the drivers code accordingly.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Rodolfo Giometti <giometti@linux.it>
---
 drivers/power/bq27x00_battery.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 4f74659..1b06134 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -44,6 +44,8 @@
 #define BQ27500_FLAG_DSC		BIT(0)
 #define BQ27500_FLAG_FC			BIT(9)
 
+#define BQ27000_RS			20 /* Resistor sense */
+
 /* If the system has several batteries we need a different name for each
  * of them...
  */
@@ -149,7 +151,7 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di)
 
 	if (di->chip == BQ27500) {
 		/* bq27500 returns signed value */
-		curr = (int)(s16)curr;
+		curr = (int)((s16)curr) * 1000;
 	} else {
 		ret = bq27x00_read(BQ27x00_REG_FLAGS, &flags, 0, di);
 		if (ret < 0) {
@@ -160,9 +162,10 @@ static int bq27x00_battery_current(struct bq27x00_device_info *di)
 			dev_dbg(di->dev, "negative current!\n");
 			curr = -curr;
 		}
+		curr = curr * 3570 / BQ27000_RS;
 	}
 
-	return curr * 1000;
+	return curr;
 }
 
 /*
-- 
1.7.2.3


  parent reply	other threads:[~2011-02-12 19:40 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-12 19:38 [PATCH v2 00/14] POWER: BQ27x00: New Properties, fixes, bq27000 support Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 01/14] bq27x00: Add type property Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 02/14] bq27x00: Improve temperature property precession Lars-Peter Clausen
2011-02-12 19:39 ` Lars-Peter Clausen [this message]
2011-02-12 19:39 ` [PATCH 04/14] bq27x00: Return -ENODEV for properties if the battery is not present Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 05/14] bq27x00: Prepare code for addition of bq27000 platform driver Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 06/14] bq27x00: Add bq27000 support Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 07/14] bq27x00: Cache battery registers Lars-Peter Clausen
2011-02-13 15:14   ` Grazvydas Ignotas
2011-02-13 18:56     ` Lars-Peter Clausen
2011-02-14  3:01   ` [PATCH 07/14 v3] " Lars-Peter Clausen
2011-02-14 21:58     ` Grazvydas Ignotas
2011-02-14 22:14       ` Lars-Peter Clausen
2011-02-15 11:48         ` Grazvydas Ignotas
2011-02-15 22:39           ` Grazvydas Ignotas
2011-02-21  8:28             ` Lars-Peter Clausen
2011-02-21 14:00               ` Grazvydas Ignotas
2011-02-21 14:49                 ` Lars-Peter Clausen
2011-02-21 21:23                   ` Grazvydas Ignotas
2011-02-12 19:39 ` [PATCH v2 07/14] bq27X00: " Lars-Peter Clausen
2011-02-12 19:52   ` Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 08/14] bq27x00: Poll battery state Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 09/14] bq27x00: Add new properties Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 10/14] bq27x00: Add MODULE_DEVICE_TABLE Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 11/14] bq27x00: Give more specific reports on battery status Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 12/14] bq27x00: Minor cleanups Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 13/14] bq27x00: Cleanup bq27x00_i2c_read Lars-Peter Clausen
2011-02-12 19:39 ` [PATCH 14/14] Ignore -ENODATA errors when generating a uevent Lars-Peter Clausen

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