linux-kernel - [PATCH] radio-bcm2048: Fix region selection

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Message-Id: <1431725571-7417-1-git-send-email-pali.rohar@gmail.com>
Date:	Fri, 15 May 2015 23:32:51 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Pavel Machek <pavel@....cz>
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	maxx <maxx@...ceboyz.net>,
	Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH] radio-bcm2048: Fix region selection

From: maxx <maxx@...ceboyz.net>

This actually fixes region selection for BCM2048 FM receiver. To select
the japanese FM-band an additional bit in FM_CTRL register needs to be
set. This might not sound so important but it enables at least me to
listen to some 'very interesting' radio transmission below normal
FM-band.

Patch writen by maxx@...ceboyz.net

Signed-off-by: Pali Rohár <pali.rohar@...il.com>
Cc: maxx@...ceboyz.net
---
 drivers/staging/media/bcm2048/radio-bcm2048.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/staging/media/bcm2048/radio-bcm2048.c b/drivers/staging/media/bcm2048/radio-bcm2048.c
index aeb6c3c..1482d4b 100644
--- a/drivers/staging/media/bcm2048/radio-bcm2048.c
+++ b/drivers/staging/media/bcm2048/radio-bcm2048.c
@@ -739,7 +739,20 @@ static int bcm2048_set_region(struct bcm2048_device *bdev, u8 region)
 		return -EINVAL;
 
 	mutex_lock(&bdev->mutex);
+
 	bdev->region_info = region_configs[region];
+
+	bdev->cache_fm_ctrl &= ~BCM2048_BAND_SELECT;
+	if (region > 2) {
+		bdev->cache_fm_ctrl |= BCM2048_BAND_SELECT;
+		err = bcm2048_send_command(bdev, BCM2048_I2C_FM_CTRL,
+					bdev->cache_fm_ctrl);
+		if (err) {
+			mutex_unlock(&bdev->mutex);
+			goto done;
+		}
+	}
+
 	mutex_unlock(&bdev->mutex);
 
 	if (bdev->frequency < region_configs[region].bottom_frequency ||
-- 
1.7.9.5

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