LTR301 ALS support

Following patch adds support for Liteon 301 Ambient light sensor.

Please let me know your review comments.

v1:
Extended LTR501 driver to support both LTR301 and LTR501 device.

v2:
1. Handled device id NULL case in probe
2. Changed pr_warn to dev_warn

Kuppuswamy Sathyanarayanan (1):
iio: ltr301: Add support for ltr301

 drivers/iio/light/Kconfig  |  2 +-
 drivers/iio/light/ltr501.c | 56 +++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 54 insertions(+), 4 deletions(-)

1.9.1

Added support for Liteon 301 Ambient light sensor. Since LTR301 and LTR501 are register compatible(and even have same part id), LTR501 driver has been extended to support both devices. LTR501 is similar to LTR301 in ALS sensing, But the only difference is, LTR501 also supports proximity sensing.

LTR501 - ALS + Proximity combo
LTR301 - ALS sensor.

---
 drivers/iio/light/Kconfig  |  2 +-
 drivers/iio/light/ltr501.c | 56 +++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 54 insertions(+), 4 deletions(-)

index a224afd..4b2ec51 100644
@@ -159,7 +159,7 @@ config LTR501
 	select IIO_TRIGGERED_BUFFER
 	help
 	 If you say yes here you get support for the Lite-On LTR-501ALS-01
-	 ambient light and proximity sensor.
+	 ambient light and proximity sensor or LTR301 Ambient light sensor.
 
 	 This driver can also be built as a module.  If so, the module
          will be called ltr501.

1.9.1

I assume that you did not find the datasheet on LiteOn's website :D. Could you send me your private copy?

I will try to rebase your LTR301 patch on my patches LTR559 [1].

thanks,
Daniel.

[1] http://article.gmane.org/gmane.linux.kernel.iio/16732