input: sensors: power up akm8963 sensor chip (0719f626) · Commits · e / devices / android_kernel_sony_msm8994

Documentation/devicetree/bindings/input/misc/akm8963.txt

0 → 100644

+35 −0

Original line number	Diff line number	Diff line
		AKM AK8963 3-axis electronic compass driver

		Required properties:

		- compatible : Should be "ak,ak8963".
		- reg : i2c address of the device.
		- interrupt-parent : Parent of interrupt.
		- interrupts : Ecompass interrupt to indicate new data ready.
		- vdd-supply : Analog power supply needed to power up the device.
		- vio-supply : Digital IO power supply needed for IO and I2C.
		- akm,layout : The layout of the ecompass sensor chip. There are 8
		patterns of layout described as below:
		0: Indicate the invalid pattern, The userspace will decide the pattern.
		1: 1st pin is right down
		2: 1st pin is left down
		3: 1st pin is left top
		4: 1st pin is right top
		5: 1st pin is left down (from top view)
		6: 1st pin is left top (from top view)
		7: 1st pin is right top (from top view)
		8: 1st pin is right down (from top view)
		- akm,gpio_rstn : The gpio pin to reset the sensor chip.

		Example:
		akm@c {
		compatible = "ak,ak8963";
		reg = <0x0c>;
		interrupt-parent = <&msmgpio>;
		interrupts = <83 0x2>;
		vdd-supply = <&pm8110_l19>;
		vio-supply = <&pm8110_l14>;
		akm,layout = <0x0>;
		akm,gpio_rstn = <&msmgpio 82 0x0>;
		};

drivers/input/misc/akm8963.c

+167 −15

Original line number	Diff line number	Diff line
		@@ -31,6 +31,9 @@
		#include <linux/slab.h>
		#include <linux/uaccess.h>
		#include <linux/workqueue.h>
		#include <linux/regulator/consumer.h>
		#include <linux/of_gpio.h>
		#include <linux/sensors.h>

		#define AKM_DEBUG_IF 0
		#define AKM_HAS_RESET 1
		@@ -38,6 +41,12 @@
		#define AKM_DRDY_TIMEOUT_MS 100
		#define AKM_BASE_NUM 10

		/* POWER SUPPLY VOLTAGE RANGE */
		#define AKM8963_VDD_MIN_UV 2000000
		#define AKM8963_VDD_MAX_UV 3300000
		#define AKM8963_VIO_MIN_UV 1750000
		#define AKM8963_VIO_MAX_UV 1950000

		struct akm_compass_data {
		struct i2c_client *i2c;
		struct input_dev *input;
		@@ -72,12 +81,13 @@ struct akm_compass_data {
		char layout;
		int irq;
		int gpio_rstn;
		int power_enabled;
		struct regulator *vdd;
		struct regulator *vio;
		};

		static struct akm_compass_data *s_akm;



		/*** I2C I/O function *********************************************/
		static int akm_i2c_rxdata(
		struct i2c_client *i2c,
		@@ -324,10 +334,10 @@ static void AKECS_SetYPR(
		}
		/* Report magnetic vector information */
		if (ready & MAG_DATA_READY) {
		input_report_abs(akm->input, ABS_RY, rbuf[5]);
		input_report_abs(akm->input, ABS_RZ, rbuf[6]);
		input_report_abs(akm->input, ABS_THROTTLE, rbuf[7]);
		input_report_abs(akm->input, ABS_RUDDER, rbuf[8]);
		input_report_abs(akm->input, ABS_X, rbuf[5]);
		input_report_abs(akm->input, ABS_Y, rbuf[6]);
		input_report_abs(akm->input, ABS_Z, rbuf[7]);
		input_report_abs(akm->input, ABS_MISC, rbuf[8]);
		}
		/* Report fusion sensor information */
		if (ready & FUSION_DATA_READY) {
		@@ -1390,6 +1400,127 @@ static int akm8963_i2c_check_device(
		return err;
		}

		static int akm_compass_power_set(struct akm_compass_data *data, bool on)
		{
		int rc;

		if (!on) {
		if (regulator_count_voltages(data->vdd) > 0)
		regulator_set_voltage(data->vdd, 0, AKM8963_VDD_MAX_UV);

		regulator_put(data->vdd);
		regulator_disable(data->vdd);

		if (regulator_count_voltages(data->vio) > 0)
		regulator_set_voltage(data->vio, 0, AKM8963_VIO_MAX_UV);

		regulator_put(data->vio);
		regulator_disable(data->vio);
		} else {
		data->vdd = regulator_get(&data->i2c->dev, "vdd");
		if (IS_ERR(data->vdd)) {
		rc = PTR_ERR(data->vdd);
		dev_err(&data->i2c->dev,
		"Regulator get failed vdd rc=%d\n", rc);
		return rc;
		}

		if (regulator_count_voltages(data->vdd) > 0) {
		rc = regulator_set_voltage(data->vdd,
		AKM8963_VDD_MIN_UV, AKM8963_VDD_MAX_UV);
		if (rc) {
		dev_err(&data->i2c->dev,
		"Regulator set failed vdd rc=%d\n",
		rc);
		goto reg_vdd_put;
		}
		}

		rc = regulator_enable(data->vdd);
		if (rc) {
		dev_err(&data->i2c->dev,
		"Regulator enable vdd failed rc=%d\n", rc);
		goto reg_vdd_put;
		}
		data->vio = regulator_get(&data->i2c->dev, "vio");
		if (IS_ERR(data->vio)) {
		rc = PTR_ERR(data->vio);
		dev_err(&data->i2c->dev,
		"Regulator get failed vio rc=%d\n", rc);
		goto reg_vdd_set;
		}

		if (regulator_count_voltages(data->vio) > 0) {
		rc = regulator_set_voltage(data->vio,
		AKM8963_VIO_MIN_UV, AKM8963_VIO_MAX_UV);
		if (rc) {
		dev_err(&data->i2c->dev,
		"Regulator set failed vio rc=%d\n", rc);
		goto reg_vio_put;
		}
		}
		rc = regulator_enable(data->vio);
		if (rc) {
		dev_err(&data->i2c->dev,
		"Regulator enable vio failed rc=%d\n", rc);
		goto reg_vio_put;
		}
		}

		/*
		* The max time for the power supply rise time is 50ms.
		* Use 80ms to make sure it meets the requirements.
		*/

		msleep(80);

		return 0;

		reg_vio_put:
		regulator_put(data->vio);
		reg_vdd_set:
		if (regulator_count_voltages(data->vdd) > 0)
		regulator_set_voltage(data->vdd, 0, AKM8963_VDD_MAX_UV);
		reg_vdd_put:
		regulator_put(data->vdd);
		return rc;
		}

		#ifdef CONFIG_OF
		static int akm_compass_parse_dt(struct device *dev,
		struct akm_compass_data *pdata)
		{
		struct device_node *np = dev->of_node;
		u32 temp_val;
		int rc;

		rc = of_property_read_u32(np, "akm,layout", &temp_val);
		if (rc && (rc != -EINVAL)) {
		dev_err(dev, "Unable to read akm,layout\n");
		return rc;
		} else {
		s_akm->layout = temp_val;
		}

		s_akm->gpio_rstn = of_get_named_gpio_flags(dev->of_node,
		"akm,gpio_rstn", 0, NULL);

		if (!gpio_is_valid(s_akm->gpio_rstn)) {
		dev_err(dev, "gpio reset pin %d is invalid.\n",
		s_akm->gpio_rstn);
		return -EINVAL;
		}

		return 0;
		}
		#else
		static int akm_compass_parse_dt(struct device *dev,
		struct akm_compass_data *pdata)
		{
		return -EINVAL;
		}
		#endif /* !CONFIG_OF */

		int akm_compass_probe(struct i2c_client client, const struct i2c_device_id id)
		{
		struct akm8963_platform_data *pdata;
		@@ -1436,18 +1567,27 @@ int akm_compass_probe(struct i2c_client client, const struct i2c_device_id id)
		for (i = 0; i < AKM_NUM_SENSORS; i++)
		s_akm->delay[i] = -1;

		/*** Set platform information ***/
		if (client->dev.of_node) {
		err = akm_compass_parse_dt(&client->dev, s_akm);
		if (err) {
		dev_err(&client->dev,
		"Unable to parse platfrom data err=%d\n", err);
		return err;
		}
		} else {
		if (client->dev.platform_data) {
		/* Copy platform data to local. */
		pdata = client->dev.platform_data;
		if (pdata) {
		/* Platform data is available. copy its value to local. */
		s_akm->layout = pdata->layout;
		s_akm->gpio_rstn = pdata->gpio_RSTN;
		} else {
		/* Platform data is not available.
		Layout and information should be set by each application. */
		dev_dbg(&client->dev, "%s: No platform data.", __func__);
		s_akm->layout = 0;
		s_akm->gpio_rstn = 0;
		dev_warn(&client->dev, "%s: No platform data.",
		__func__);
		}
		}

		/*** I2C initialization ***/
		@@ -1455,6 +1595,9 @@ int akm_compass_probe(struct i2c_client client, const struct i2c_device_id id)
		/* set client data */
		i2c_set_clientdata(client, s_akm);
		/* check connection */
		err = akm_compass_power_set(s_akm, 1);
		if (err < 0)
		goto exit2;
		err = akm8963_i2c_check_device(client);
		if (err < 0)
		goto exit2;
		@@ -1527,6 +1670,7 @@ static int akm_compass_remove(struct i2c_client *client)
		{
		struct akm_compass_data *akm = i2c_get_clientdata(client);

		akm_compass_power_set(akm, 0);
		remove_sysfs_interfaces(akm);
		if (misc_deregister(&akm_compass_dev) < 0)
		dev_err(&client->dev, "misc deregister failed.");
		@@ -1548,12 +1692,20 @@ static const struct dev_pm_ops akm_compass_pm_ops = {
		.resume = akm_compass_resume,
		};

		static struct of_device_id akm8963_match_table[] = {
		{ .compatible = "ak,ak8963", },
		{ .compatible = "akm,akm8963", },
		{ },
		};

		static struct i2c_driver akm_compass_driver = {
		.probe = akm_compass_probe,
		.remove = akm_compass_remove,
		.id_table = akm_compass_id,
		.driver = {
		.name = AKM_I2C_NAME,
		.owner = THIS_MODULE,
		.of_match_table = akm8963_match_table,
		.pm = &akm_compass_pm_ops,
		},
		};