linux-kernel - [PATCH 2/6] iio: light: Updated Vishay Capella cm32181 ambient light sensor driver.

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Message-Id: <1432268380-7302-2-git-send-email-ktsai@capellamicro.com>
Date:	Thu, 21 May 2015 21:19:36 -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 2/6] iio: light: Updated Vishay Capella cm32181 ambient light sensor driver.

- Added cm32181_als_info structure.

Signed-off-by: Kevin Tsai <ktsai@...ellamicro.com>
---
 drivers/iio/light/cm32181.c | 42 +++++++++++++++++++++++++++++++++---------
 1 file changed, 33 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
index 0491d73..6b11145 100644
--- a/drivers/iio/light/cm32181.c
+++ b/drivers/iio/light/cm32181.c
@@ -48,6 +48,7 @@
 #define CM32181_ALS_WL_DEFAULT		0x0000
 
 /* Software parameters */
+#define CM32181_HW_ID			0x81
 #define CM32181_MLUX_PER_BIT		5	/* ALS_SM=01 IT=800ms */
 #define CM32181_MLUX_PER_BIT_BASE_IT	800000	/* Based on IT=800ms */
 #define	CM32181_CALIBSCALE_DEFAULT	1000
@@ -58,11 +59,31 @@ static const int als_it_bits[] = {12, 8, 0, 1, 2, 3};
 static const int als_it_value[] = {25000, 50000, 100000, 200000, 400000,
 	800000};
 
+struct cm32181_als_info {
+	u8 hw_id;
+	u16 reg_cmd;
+	u16 reg_als_wh;
+	u16 reg_als_wl;
+	int calibscale;
+	int mlux_per_bit;
+	int mlux_per_bit_base_it;
+};
+
+static struct cm32181_als_info cm32181_als_info_default = {
+	.hw_id = CM32181_HW_ID,
+	.reg_cmd = CM32181_CMD_DEFAULT,
+	.reg_als_wh = CM32181_ALS_WH_DEFAULT,
+	.reg_als_wl = CM32181_ALS_WL_DEFAULT,
+	.calibscale = CM32181_CALIBSCALE_DEFAULT,
+	.mlux_per_bit = CM32181_MLUX_PER_BIT,
+	.mlux_per_bit_base_it = CM32181_MLUX_PER_BIT_BASE_IT,
+};
+
 struct cm32181_chip {
 	struct i2c_client *client;
 	struct mutex lock;
+	struct cm32181_als_info *als_info;
 	u16 conf_regs[CM32181_CONF_REG_NUM];
-	int calibscale;
 };
 
 /**
@@ -76,22 +97,25 @@ struct cm32181_chip {
 static int cm32181_reg_init(struct cm32181_chip *chip)
 {
 	struct i2c_client *client = chip->client;
+	struct cm32181_als_info *als_info;
 	int i;
 	s32 ret;
 
+	chip->als_info = &cm32181_als_info_default;
+	als_info = chip->als_info;
+
 	ret = i2c_smbus_read_word_data(client, CM32181_REG_ADDR_ID);
 	if (ret < 0)
 		return ret;
 
 	/* check device ID */
-	if ((ret & 0xFF) != 0x81)
+	if ((ret & 0xFF) != als_info->hw_id)
 		return -ENODEV;
 
 	/* Default Values */
-	chip->conf_regs[CM32181_REG_ADDR_CMD] = CM32181_CMD_DEFAULT;
-	chip->conf_regs[CM32181_REG_ADDR_ALS_WH] = CM32181_ALS_WH_DEFAULT;
-	chip->conf_regs[CM32181_REG_ADDR_ALS_WL] = CM32181_ALS_WL_DEFAULT;
-	chip->calibscale = CM32181_CALIBSCALE_DEFAULT;
+	chip->conf_regs[CM32181_REG_ADDR_CMD] = als_info->reg_cmd;
+	chip->conf_regs[CM32181_REG_ADDR_ALS_WH] = als_info->reg_als_wh;
+	chip->conf_regs[CM32181_REG_ADDR_ALS_WL] = als_info->reg_als_wl;
 
 	/* Initialize registers*/
 	for (i = 0; i < CM32181_CONF_REG_NUM; i++) {
@@ -197,7 +221,7 @@ static int cm32181_get_lux(struct cm32181_chip *chip)
 		return ret;
 
 	lux *= ret;
-	lux *= chip->calibscale;
+	lux *= chip->als_info->calibscale;
 	lux /= CM32181_CALIBSCALE_RESOLUTION;
 	lux /= MLUX_PER_LUX;
 
@@ -222,7 +246,7 @@ static int cm32181_read_raw(struct iio_dev *indio_dev,
 		*val = ret;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_CALIBSCALE:
-		*val = chip->calibscale;
+		*val = chip->als_info->calibscale;
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_INT_TIME:
 		*val = 0;
@@ -242,7 +266,7 @@ static int cm32181_write_raw(struct iio_dev *indio_dev,
 
 	switch (mask) {
 	case IIO_CHAN_INFO_CALIBSCALE:
-		chip->calibscale = val;
+		chip->als_info->calibscale = val;
 		return val;
 	case IIO_CHAN_INFO_INT_TIME:
 		ret = cm32181_write_als_it(chip, val2);
-- 
1.8.3.1

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