drivers/misc/lis3lv02d/lis3lv02d_i2c.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * drivers/hwmon/lis3lv02d_i2c.c
  *
  * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
  * Driver is based on corresponding SPI driver written by Daniel Mack
  * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
  *
  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/pm_runtime.h>
 #include <linux/delay.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/of_device.h>

 #include "lis3lv02d.h"

 #define DRV_NAME	"lis3lv02d_i2c"

 static const char reg_vdd[]    = "Vdd";
 static const char reg_vdd_io[] = "Vdd_IO";

 static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
 {
 	int ret;
 	if (state == LIS3_REG_OFF) {
 		ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
 					lis3->regulators);
 	} else {
 		ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
 					lis3->regulators);
 		/* Chip needs time to wakeup. Not mentioned in datasheet */
 		usleep_range(10000, 20000);
 	}
 	return ret;
 }

 static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
 {
 	struct i2c_client *c = lis3->bus_priv;
 	return i2c_smbus_write_byte_data(c, reg, value);
 }

 static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
 {
 	struct i2c_client *c = lis3->bus_priv;
 	*v = i2c_smbus_read_byte_data(c, reg);
 	return 0;
 }

 static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
 				u8 *v)
 {
 	struct i2c_client *c = lis3->bus_priv;
 	reg |= (1 << 7); /* 7th bit enables address auto incrementation */
 	return i2c_smbus_read_i2c_block_data(c, reg, len, v);
 }

 static int lis3_i2c_init(struct lis3lv02d *lis3)
 {
 	u8 reg;
 	int ret;

 	lis3_reg_ctrl(lis3, LIS3_REG_ON);

 	lis3->read(lis3, WHO_AM_I, &reg);
 	if (reg != lis3->whoami)
 		printk(KERN_ERR "lis3: power on failure\n");

 	/* power up the device */
 	ret = lis3->read(lis3, CTRL_REG1, &reg);
 	if (ret < 0)
 		return ret;

 	if (lis3->whoami == WAI_3DLH)
 		reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
 	else
 		reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;

 	return lis3->write(lis3, CTRL_REG1, reg);
 }

 /* Default axis mapping but it can be overwritten by platform data */
 static union axis_conversion lis3lv02d_axis_map =
 	{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };

 #ifdef CONFIG_OF
 static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
 	{ .compatible = "st,lis3lv02d" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
 #endif

 static int lis3lv02d_i2c_probe(struct i2c_client *client)
 {
 	int ret = 0;
 	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;

 #ifdef CONFIG_OF
 	if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
 		lis3_dev.of_node = client->dev.of_node;
 		ret = lis3lv02d_init_dt(&lis3_dev);
 		if (ret)
 			return ret;
 		pdata = lis3_dev.pdata;
 	}
 #endif

 	if (pdata) {
 		if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
 			(i2c_check_functionality(client->adapter,
 						I2C_FUNC_SMBUS_I2C_BLOCK)))
 			lis3_dev.blkread  = lis3_i2c_blockread;

 		if (pdata->axis_x)
 			lis3lv02d_axis_map.x = pdata->axis_x;

 		if (pdata->axis_y)
 			lis3lv02d_axis_map.y = pdata->axis_y;

 		if (pdata->axis_z)
 			lis3lv02d_axis_map.z = pdata->axis_z;

 		if (pdata->setup_resources)
 			ret = pdata->setup_resources();

 		if (ret)
 			goto fail;
 	}

 	lis3_dev.regulators[0].supply = reg_vdd;
 	lis3_dev.regulators[1].supply = reg_vdd_io;
 	ret = regulator_bulk_get(&client->dev,
 				 ARRAY_SIZE(lis3_dev.regulators),
 				 lis3_dev.regulators);
 	if (ret < 0)
 		goto fail;

 	lis3_dev.pdata	  = pdata;
 	lis3_dev.bus_priv = client;
 	lis3_dev.init	  = lis3_i2c_init;
 	lis3_dev.read	  = lis3_i2c_read;
 	lis3_dev.write	  = lis3_i2c_write;
 	lis3_dev.reg_ctrl = lis3_reg_ctrl;
 	lis3_dev.irq	  = client->irq;
 	lis3_dev.ac	  = lis3lv02d_axis_map;
 	lis3_dev.pm_dev	  = &client->dev;

 	i2c_set_clientdata(client, &lis3_dev);

 	/* Provide power over the init call */
 	lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);

 	ret = lis3lv02d_init_device(&lis3_dev);

 	lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);

 	if (ret)
 		goto fail2;
 	return 0;

 fail2:
 	regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
 				lis3_dev.regulators);
 fail:
 	if (pdata && pdata->release_resources)
 		pdata->release_resources();
 	return ret;
 }

 static void lis3lv02d_i2c_remove(struct i2c_client *client)
 {
 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
 	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;

 	if (pdata && pdata->release_resources)
 		pdata->release_resources();

 	lis3lv02d_joystick_disable(lis3);
 	lis3lv02d_remove_fs(&lis3_dev);

 	regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
 			    lis3_dev.regulators);
 }

 #ifdef CONFIG_PM_SLEEP
 static int lis3lv02d_i2c_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

 	if (!lis3->pdata || !lis3->pdata->wakeup_flags)
 		lis3lv02d_poweroff(lis3);
 	return 0;
 }

 static int lis3lv02d_i2c_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

 	/*
 	 * pm_runtime documentation says that devices should always
 	 * be powered on at resume. Pm_runtime turns them off after system
 	 * wide resume is complete.
 	 */
 	if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
 		pm_runtime_suspended(dev))
 		lis3lv02d_poweron(lis3);

 	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */

 #ifdef CONFIG_PM
 static int lis3_i2c_runtime_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

 	lis3lv02d_poweroff(lis3);
 	return 0;
 }

 static int lis3_i2c_runtime_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

 	lis3lv02d_poweron(lis3);
 	return 0;
 }
 #endif /* CONFIG_PM */

 static const struct i2c_device_id lis3lv02d_id[] = {
 	{"lis3lv02d", LIS3LV02D},
 	{"lis331dlh", LIS331DLH},
 	{}
 };

 MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);

 static const struct dev_pm_ops lis3_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
 				lis3lv02d_i2c_resume)
 	SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
 			   lis3_i2c_runtime_resume,
 			   NULL)
 };

 static struct i2c_driver lis3lv02d_i2c_driver = {
 	.driver	 = {
 		.name   = DRV_NAME,
 		.pm     = &lis3_pm_ops,
 		.of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
 	},
 	.probe = lis3lv02d_i2c_probe,
 	.remove	= lis3lv02d_i2c_remove,
 	.id_table = lis3lv02d_id,
 };

 module_i2c_driver(lis3lv02d_i2c_driver);

 MODULE_AUTHOR("Nokia Corporation");
 MODULE_DESCRIPTION("lis3lv02d I2C interface");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* drivers/hwmon/lis3lv02d_i2c.c
	*
	* Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
	* Driver is based on corresponding SPI driver written by Daniel Mack
	* (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
	*
	* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
	*
	* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/pm_runtime.h>
	#include <linux/delay.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/of_device.h>

	#include "lis3lv02d.h"

	#define DRV_NAME "lis3lv02d_i2c"

	static const char reg_vdd[] = "Vdd";
	static const char reg_vdd_io[] = "Vdd_IO";

	static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
	{
	int ret;
	if (state == LIS3_REG_OFF) {
	ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
	lis3->regulators);
	} else {
	ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
	lis3->regulators);
	/* Chip needs time to wakeup. Not mentioned in datasheet */
	usleep_range(10000, 20000);
	}
	return ret;
	}

	static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
	{
	struct i2c_client *c = lis3->bus_priv;
	return i2c_smbus_write_byte_data(c, reg, value);
	}

	static inline s32 lis3_i2c_read(struct lis3lv02d lis3, int reg, u8 v)
	{
	struct i2c_client *c = lis3->bus_priv;
	*v = i2c_smbus_read_byte_data(c, reg);
	return 0;
	}

	static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
	u8 *v)
	{
	struct i2c_client *c = lis3->bus_priv;
	reg \|= (1 << 7); /* 7th bit enables address auto incrementation */
	return i2c_smbus_read_i2c_block_data(c, reg, len, v);
	}

	static int lis3_i2c_init(struct lis3lv02d *lis3)
	{
	u8 reg;
	int ret;

	lis3_reg_ctrl(lis3, LIS3_REG_ON);

	lis3->read(lis3, WHO_AM_I, &reg);
	if (reg != lis3->whoami)
	printk(KERN_ERR "lis3: power on failure\n");

	/* power up the device */
	ret = lis3->read(lis3, CTRL_REG1, &reg);
	if (ret < 0)
	return ret;

	if (lis3->whoami == WAI_3DLH)
	reg \|= CTRL1_PM0 \| CTRL1_Xen \| CTRL1_Yen \| CTRL1_Zen;
	else
	reg \|= CTRL1_PD0 \| CTRL1_Xen \| CTRL1_Yen \| CTRL1_Zen;

	return lis3->write(lis3, CTRL_REG1, reg);
	}

	/* Default axis mapping but it can be overwritten by platform data */
	static union axis_conversion lis3lv02d_axis_map =
	{ .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };

	#ifdef CONFIG_OF
	static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
	{ .compatible = "st,lis3lv02d" },
	{}
	};
	MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
	#endif

	static int lis3lv02d_i2c_probe(struct i2c_client *client)
	{
	int ret = 0;
	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;

	#ifdef CONFIG_OF
	if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
	lis3_dev.of_node = client->dev.of_node;
	ret = lis3lv02d_init_dt(&lis3_dev);
	if (ret)
	return ret;
	pdata = lis3_dev.pdata;
	}
	#endif

	if (pdata) {
	if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
	(i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_I2C_BLOCK)))
	lis3_dev.blkread = lis3_i2c_blockread;

	if (pdata->axis_x)
	lis3lv02d_axis_map.x = pdata->axis_x;

	if (pdata->axis_y)
	lis3lv02d_axis_map.y = pdata->axis_y;

	if (pdata->axis_z)
	lis3lv02d_axis_map.z = pdata->axis_z;

	if (pdata->setup_resources)
	ret = pdata->setup_resources();

	if (ret)
	goto fail;
	}

	lis3_dev.regulators[0].supply = reg_vdd;
	lis3_dev.regulators[1].supply = reg_vdd_io;
	ret = regulator_bulk_get(&client->dev,
	ARRAY_SIZE(lis3_dev.regulators),
	lis3_dev.regulators);
	if (ret < 0)
	goto fail;

	lis3_dev.pdata = pdata;
	lis3_dev.bus_priv = client;
	lis3_dev.init = lis3_i2c_init;
	lis3_dev.read = lis3_i2c_read;
	lis3_dev.write = lis3_i2c_write;
	lis3_dev.reg_ctrl = lis3_reg_ctrl;
	lis3_dev.irq = client->irq;
	lis3_dev.ac = lis3lv02d_axis_map;
	lis3_dev.pm_dev = &client->dev;

	i2c_set_clientdata(client, &lis3_dev);

	/* Provide power over the init call */
	lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);

	ret = lis3lv02d_init_device(&lis3_dev);

	lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);

	if (ret)
	goto fail2;
	return 0;

	fail2:
	regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
	lis3_dev.regulators);
	fail:
	if (pdata && pdata->release_resources)
	pdata->release_resources();
	return ret;
	}

	static void lis3lv02d_i2c_remove(struct i2c_client *client)
	{
	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
	struct lis3lv02d_platform_data *pdata = client->dev.platform_data;

	if (pdata && pdata->release_resources)
	pdata->release_resources();

	lis3lv02d_joystick_disable(lis3);
	lis3lv02d_remove_fs(&lis3_dev);

	regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
	lis3_dev.regulators);
	}

	#ifdef CONFIG_PM_SLEEP
	static int lis3lv02d_i2c_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

	if (!lis3->pdata \|\| !lis3->pdata->wakeup_flags)
	lis3lv02d_poweroff(lis3);
	return 0;
	}

	static int lis3lv02d_i2c_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

	/*
	* pm_runtime documentation says that devices should always
	* be powered on at resume. Pm_runtime turns them off after system
	* wide resume is complete.
	*/
	if (!lis3->pdata \|\| !lis3->pdata->wakeup_flags \|\|
	pm_runtime_suspended(dev))
	lis3lv02d_poweron(lis3);

	return 0;
	}
	#endif /* CONFIG_PM_SLEEP */

	#ifdef CONFIG_PM
	static int lis3_i2c_runtime_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

	lis3lv02d_poweroff(lis3);
	return 0;
	}

	static int lis3_i2c_runtime_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct lis3lv02d *lis3 = i2c_get_clientdata(client);

	lis3lv02d_poweron(lis3);
	return 0;
	}
	#endif /* CONFIG_PM */

	static const struct i2c_device_id lis3lv02d_id[] = {
	{"lis3lv02d", LIS3LV02D},
	{"lis331dlh", LIS331DLH},
	{}
	};

	MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);

	static const struct dev_pm_ops lis3_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
	lis3lv02d_i2c_resume)
	SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
	lis3_i2c_runtime_resume,
	NULL)
	};

	static struct i2c_driver lis3lv02d_i2c_driver = {
	.driver = {
	.name = DRV_NAME,
	.pm = &lis3_pm_ops,
	.of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
	},
	.probe = lis3lv02d_i2c_probe,
	.remove = lis3lv02d_i2c_remove,
	.id_table = lis3lv02d_id,
	};

	module_i2c_driver(lis3lv02d_i2c_driver);

	MODULE_AUTHOR("Nokia Corporation");
	MODULE_DESCRIPTION("lis3lv02d I2C interface");
	MODULE_LICENSE("GPL");