linux-kernel - [PATCH 3/6] iio: light: Updated Vishay Capella cm32181 ambient light sensor driver. - Added Power Management support.

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Date:	Thu, 21 May 2015 17:30:42 -0700
From:	Kevin Tsai <ktsai@...ellamicro.com>
To:	Kevin Tsai <ktsai@...ellamicro.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Arnd Bergmann <arnd@...db.de>, Joe Perches <joe@...ches.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Daniel Baluta <daniel.baluta@...el.com>,
	Roberta Dobrescu <roberta.dobrescu@...il.com>,
	Kuppuswamy Sathyanarayanan 
	<sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org
Subject: [PATCH 3/6] iio: light: Updated Vishay Capella cm32181 ambient light sensor driver. - Added Power Management support. - Added driver remove routine.

Signed-off-by: Kevin Tsai <ktsai@...ellamicro.com>
---
Added Power Management support.
Added remove routine.

 drivers/iio/light/cm32181.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 6b11145..9bc3e1f 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -370,11 +370,51 @@ static int cm32181_probe(struct i2c_client *client,
 	return 0;
 }
 
+static int cm32181_remove(struct i2c_client *client)
+{
+	i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
+		CM32181_CMD_ALS_DISABLE);
+
+	return 0;
+}
+
 static const struct i2c_device_id cm32181_id[] = {
 	{ "cm32181", 0 },
 	{ }
 };
 
+#ifdef CONFIG_PM_SLEEP
+static int cm32181_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct cm32181_chip *chip = iio_priv(indio_dev);
+	struct i2c_client *client = chip->client;
+	int ret;
+
+	ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
+					CM32181_CMD_ALS_DISABLE);
+
+	return ret;
+}
+
+static int cm32181_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+	struct cm32181_chip *chip = iio_priv(indio_dev);
+	struct i2c_client *client = chip->client;
+	int ret;
+
+	chip->conf_regs[CM32181_REG_ADDR_CMD] &= ~CM32181_CMD_ALS_DISABLE;
+	ret = i2c_smbus_write_word_data(client, CM32181_REG_ADDR_CMD,
+				chip->conf_regs[CM32181_REG_ADDR_CMD]);
+
+	return ret;
+}
+
+static const struct dev_pm_ops cm32181_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(cm32181_suspend, cm32181_resume)};
+#endif
+
 MODULE_DEVICE_TABLE(i2c, cm32181_id);
 
 static const struct of_device_id cm32181_of_match[] = {
@@ -387,9 +427,13 @@ static struct i2c_driver cm32181_driver = {
 		.name	= "cm32181",
 		.of_match_table = of_match_ptr(cm32181_of_match),
 		.owner	= THIS_MODULE,
+#ifdef CONFIG_PM_SLEEP
+		.pm     = &cm32181_pm_ops,
+#endif
 	},
 	.id_table	= cm32181_id,
 	.probe		= cm32181_probe,
+	.remove		= cm32181_remove,
 };
 
 module_i2c_driver(cm32181_driver);
-- 
1.8.3.1

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