Commit 525530af authored by Nick Reitemeyer's avatar Nick Reitemeyer Committed by Jonathan Cameron
Browse files

iio: magnetometer: ak8974: add Alps hscdtd008a 



The hscdtd008a is similar to the AK8974:
Only the whoami value and some registers are different.

Signed-off-by: default avatarNick Reitemeyer <nick.reitemeyer@web.de>
Reviewed-by: default avatarStephan Gerhold <stephan@gerhold.net>
Tested-by: default avatarStephan Gerhold <stephan@gerhold.net>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Tested-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 26441f92

drivers/iio/magnetometer/ak8974.c

+30 −8
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ 
#define AK8974_WHOAMI_VALUE_AMI306 0x46

#define AK8974_WHOAMI_VALUE_AMI305 0x47

#define AK8974_WHOAMI_VALUE_AK8974 0x48

#define AK8974_WHOAMI_VALUE_HSCDTD008A 0x49



#define AK8974_DATA_X		0x10

#define AK8974_DATA_Y		0x12
@@ -140,6 +141,12 @@ 
#define AK8974_INT_CTRL_PULSE	BIT(1) /* 0 = latched; 1 = pulse (50 usec) */

#define AK8974_INT_CTRL_RESDEF	(AK8974_INT_CTRL_XYZEN | AK8974_INT_CTRL_POL)



/* HSCDTD008A-specific control register */

#define HSCDTD008A_CTRL4	0x1E

#define HSCDTD008A_CTRL4_MMD	BIT(7)	/* must be set to 1 */

#define HSCDTD008A_CTRL4_RANGE	BIT(4)	/* 0 = 14-bit output; 1 = 15-bit output */

#define HSCDTD008A_CTRL4_RESDEF	(HSCDTD008A_CTRL4_MMD | HSCDTD008A_CTRL4_RANGE)



/* The AMI305 has elaborate FW version and serial number registers */

#define AMI305_VER		0xE8

#define AMI305_SN		0xEA
@@ -241,10 +248,17 @@ static int ak8974_reset(struct ak8974 *ak8974) 
	ret = regmap_write(ak8974->map, AK8974_CTRL3, AK8974_CTRL3_RESDEF);

	if (ret)

		return ret;

	if (ak8974->variant != AK8974_WHOAMI_VALUE_HSCDTD008A) {

		ret = regmap_write(ak8974->map, AK8974_INT_CTRL,

				   AK8974_INT_CTRL_RESDEF);

		if (ret)

			return ret;

	} else {

		ret = regmap_write(ak8974->map, HSCDTD008A_CTRL4,

				   HSCDTD008A_CTRL4_RESDEF);

		if (ret)

			return ret;

	}



	/* After reset, power off is default state */

	return ak8974_set_power(ak8974, AK8974_PWR_OFF);
@@ -267,6 +281,8 @@ static int ak8974_configure(struct ak8974 *ak8974) 
		if (ret)

			return ret;

	}

	if (ak8974->variant == AK8974_WHOAMI_VALUE_HSCDTD008A)

		return 0;

	ret = regmap_write(ak8974->map, AK8974_INT_CTRL, AK8974_INT_CTRL_POL);

	if (ret)

		return ret;
@@ -495,6 +511,10 @@ static int ak8974_detect(struct ak8974 *ak8974) 
		name = "ak8974";

		dev_info(&ak8974->i2c->dev, "detected AK8974\n");

		break;

	case AK8974_WHOAMI_VALUE_HSCDTD008A:

		name = "hscdtd008a";

		dev_info(&ak8974->i2c->dev, "detected hscdtd008a\n");

		break;

	default:

		dev_err(&ak8974->i2c->dev, "unsupported device (%02x) ",

			whoami);
@@ -674,18 +694,18 @@ static bool ak8974_writeable_reg(struct device *dev, unsigned int reg) 
	case AK8974_INT_CTRL:

	case AK8974_INT_THRES:

	case AK8974_INT_THRES + 1:

		return true;

	case AK8974_PRESET:

	case AK8974_PRESET + 1:

		return true;

		return ak8974->variant != AK8974_WHOAMI_VALUE_HSCDTD008A;

	case AK8974_OFFSET_X:

	case AK8974_OFFSET_X + 1:

	case AK8974_OFFSET_Y:

	case AK8974_OFFSET_Y + 1:

	case AK8974_OFFSET_Z:

	case AK8974_OFFSET_Z + 1:

		if (ak8974->variant == AK8974_WHOAMI_VALUE_AK8974)

			return true;

		return false;

		return ak8974->variant == AK8974_WHOAMI_VALUE_AK8974 ||

		       ak8974->variant == AK8974_WHOAMI_VALUE_HSCDTD008A;

	case AMI305_OFFSET_X:

	case AMI305_OFFSET_X + 1:

	case AMI305_OFFSET_Y:
@@ -931,12 +951,14 @@ static const struct i2c_device_id ak8974_id[] = { 
	{"ami305", 0 },

	{"ami306", 0 },

	{"ak8974", 0 },

	{"hscdtd008a", 0 },

	{}

};

MODULE_DEVICE_TABLE(i2c, ak8974_id);



static const struct of_device_id ak8974_of_match[] = {

	{ .compatible = "asahi-kasei,ak8974", },

	{ .compatible = "alps,hscdtd008a", },

	{}

};

MODULE_DEVICE_TABLE(of, ak8974_of_match);