linux-kernel - [04/10] i2c/tsl2550: Fix lux value in extended mode

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Message-Id: <20100105194914.719225486@mini.kroah.org>
Date:	Tue, 05 Jan 2010 11:47:55 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	stable-review@...nel.org
Cc:	Michele Jr De Candia <michele.decandia@...ueteam.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: [04/10] i2c/tsl2550: Fix lux value in extended mode

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Michele Jr De Candia <michele.decandia@...ueteam.com>

commit 5f5bfb09d81c9a1d26238ae6668e584c14ae3daf upstream.

According to the TAOS Application Note 'Controlling a Backlight with
the TSL2550 Ambient Light Sensor' (page 14), the actual lux value in
extended mode should be obtained multiplying the calculated lux value
by 5.

Signed-off-by: Michele Jr De Candia <michele.decandia@...ueteam.com>
Signed-off-by: Jean Delvare <khali@...ux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/i2c/chips/tsl2550.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/i2c/chips/tsl2550.c
+++ b/drivers/i2c/chips/tsl2550.c
@@ -277,6 +277,7 @@ static DEVICE_ATTR(operating_mode, S_IWU
 
 static ssize_t __tsl2550_show_lux(struct i2c_client *client, char *buf)
 {
+	struct tsl2550_data *data = i2c_get_clientdata(client);
 	u8 ch0, ch1;
 	int ret;
 
@@ -296,6 +297,8 @@ static ssize_t __tsl2550_show_lux(struct
 	ret = tsl2550_calculate_lux(ch0, ch1);
 	if (ret < 0)
 		return ret;
+	if (data->operating_mode == 1)
+		ret *= 5;
 
 	return sprintf(buf, "%d\n", ret);
 }


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