drivers/mfd/adp5520.c - linux - Git at Google

 /*
  * Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
  * LCD Backlight: drivers/video/backlight/adp5520_bl
  * LEDs		: drivers/led/leds-adp5520
  * GPIO		: drivers/gpio/adp5520-gpio (ADP5520 only)
  * Keys		: drivers/input/keyboard/adp5520-keys (ADP5520 only)
  *
  * Copyright 2009 Analog Devices Inc.
  *
  * Derived from da903x:
  * Copyright (C) 2008 Compulab, Ltd.
  *	Mike Rapoport <mike@compulab.co.il>
  *
  * Copyright (C) 2006-2008 Marvell International Ltd.
  *	Eric Miao <eric.miao@marvell.com>
  *
  * Licensed under the GPL-2 or later.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/err.h>
 #include <linux/i2c.h>

 #include <linux/mfd/adp5520.h>

 struct adp5520_chip {
 	struct i2c_client *client;
 	struct device *dev;
 	struct mutex lock;
 	struct blocking_notifier_head notifier_list;
 	int irq;
 	unsigned long id;
 	uint8_t mode;
 };

 static int __adp5520_read(struct i2c_client *client,
 				int reg, uint8_t *val)
 {
 	int ret;

 	ret = i2c_smbus_read_byte_data(client, reg);
 	if (ret < 0) {
 		dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
 		return ret;
 	}

 	*val = (uint8_t)ret;
 	return 0;
 }

 static int __adp5520_write(struct i2c_client *client,
 				 int reg, uint8_t val)
 {
 	int ret;

 	ret = i2c_smbus_write_byte_data(client, reg, val);
 	if (ret < 0) {
 		dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
 				val, reg);
 		return ret;
 	}
 	return 0;
 }

 static int __adp5520_ack_bits(struct i2c_client *client, int reg,
 			      uint8_t bit_mask)
 {
 	struct adp5520_chip *chip = i2c_get_clientdata(client);
 	uint8_t reg_val;
 	int ret;

 	mutex_lock(&chip->lock);

 	ret = __adp5520_read(client, reg, &reg_val);

 	if (!ret) {
 		reg_val |= bit_mask;
 		ret = __adp5520_write(client, reg, reg_val);
 	}

 	mutex_unlock(&chip->lock);
 	return ret;
 }

 int adp5520_write(struct device *dev, int reg, uint8_t val)
 {
 	return __adp5520_write(to_i2c_client(dev), reg, val);
 }
 EXPORT_SYMBOL_GPL(adp5520_write);

 int adp5520_read(struct device *dev, int reg, uint8_t *val)
 {
 	return __adp5520_read(to_i2c_client(dev), reg, val);
 }
 EXPORT_SYMBOL_GPL(adp5520_read);

 int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
 {
 	struct adp5520_chip *chip = dev_get_drvdata(dev);
 	uint8_t reg_val;
 	int ret;

 	mutex_lock(&chip->lock);

 	ret = __adp5520_read(chip->client, reg, &reg_val);

 	if (!ret && ((reg_val & bit_mask) != bit_mask)) {
 		reg_val |= bit_mask;
 		ret = __adp5520_write(chip->client, reg, reg_val);
 	}

 	mutex_unlock(&chip->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(adp5520_set_bits);

 int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
 {
 	struct adp5520_chip *chip = dev_get_drvdata(dev);
 	uint8_t reg_val;
 	int ret;

 	mutex_lock(&chip->lock);

 	ret = __adp5520_read(chip->client, reg, &reg_val);

 	if (!ret && (reg_val & bit_mask)) {
 		reg_val &= ~bit_mask;
 		ret = __adp5520_write(chip->client, reg, reg_val);
 	}

 	mutex_unlock(&chip->lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(adp5520_clr_bits);

 int adp5520_register_notifier(struct device *dev, struct notifier_block *nb,
 				unsigned int events)
 {
 	struct adp5520_chip *chip = dev_get_drvdata(dev);

 	if (chip->irq) {
 		adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
 			events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
 			ADP5520_OVP_IEN | ADP5520_CMPR_IEN));

 		return blocking_notifier_chain_register(&chip->notifier_list,
 			 nb);
 	}

 	return -ENODEV;
 }
 EXPORT_SYMBOL_GPL(adp5520_register_notifier);

 int adp5520_unregister_notifier(struct device *dev, struct notifier_block *nb,
 				unsigned int events)
 {
 	struct adp5520_chip *chip = dev_get_drvdata(dev);

 	adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
 		events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
 		ADP5520_OVP_IEN | ADP5520_CMPR_IEN));

 	return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
 }
 EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);

 static irqreturn_t adp5520_irq_thread(int irq, void *data)
 {
 	struct adp5520_chip *chip = data;
 	unsigned int events;
 	uint8_t reg_val;
 	int ret;

 	ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, &reg_val);
 	if (ret)
 		goto out;

 	events =  reg_val & (ADP5520_OVP_INT | ADP5520_CMPR_INT |
 		ADP5520_GPI_INT | ADP5520_KR_INT | ADP5520_KP_INT);

 	blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
 	/* ACK, Sticky bits are W1C */
 	__adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);

 out:
 	return IRQ_HANDLED;
 }

 static int __remove_subdev(struct device *dev, void *unused)
 {
 	platform_device_unregister(to_platform_device(dev));
 	return 0;
 }

 static int adp5520_remove_subdevs(struct adp5520_chip *chip)
 {
 	return device_for_each_child(chip->dev, NULL, __remove_subdev);
 }

 static int adp5520_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
 {
 	struct adp5520_platform_data *pdata = dev_get_platdata(&client->dev);
 	struct platform_device *pdev;
 	struct adp5520_chip *chip;
 	int ret;

 	if (!i2c_check_functionality(client->adapter,
 					I2C_FUNC_SMBUS_BYTE_DATA)) {
 		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
 		return -EIO;
 	}

 	if (pdata == NULL) {
 		dev_err(&client->dev, "missing platform data\n");
 		return -ENODEV;
 	}

 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;

 	i2c_set_clientdata(client, chip);
 	chip->client = client;

 	chip->dev = &client->dev;
 	chip->irq = client->irq;
 	chip->id = id->driver_data;
 	mutex_init(&chip->lock);

 	if (chip->irq) {
 		BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);

 		ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
 				IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 				"adp5520", chip);
 		if (ret) {
 			dev_err(&client->dev, "failed to request irq %d\n",
 					chip->irq);
 			return ret;
 		}
 	}

 	ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
 	if (ret) {
 		dev_err(&client->dev, "failed to write\n");
 		goto out_free_irq;
 	}

 	if (pdata->keys) {
 		pdev = platform_device_register_data(chip->dev, "adp5520-keys",
 				chip->id, pdata->keys, sizeof(*pdata->keys));
 		if (IS_ERR(pdev)) {
 			ret = PTR_ERR(pdev);
 			goto out_remove_subdevs;
 		}
 	}

 	if (pdata->gpio) {
 		pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
 				chip->id, pdata->gpio, sizeof(*pdata->gpio));
 		if (IS_ERR(pdev)) {
 			ret = PTR_ERR(pdev);
 			goto out_remove_subdevs;
 		}
 	}

 	if (pdata->leds) {
 		pdev = platform_device_register_data(chip->dev, "adp5520-led",
 				chip->id, pdata->leds, sizeof(*pdata->leds));
 		if (IS_ERR(pdev)) {
 			ret = PTR_ERR(pdev);
 			goto out_remove_subdevs;
 		}
 	}

 	if (pdata->backlight) {
 		pdev = platform_device_register_data(chip->dev,
 						"adp5520-backlight",
 						chip->id,
 						pdata->backlight,
 						sizeof(*pdata->backlight));
 		if (IS_ERR(pdev)) {
 			ret = PTR_ERR(pdev);
 			goto out_remove_subdevs;
 		}
 	}

 	return 0;

 out_remove_subdevs:
 	adp5520_remove_subdevs(chip);

 out_free_irq:
 	if (chip->irq)
 		free_irq(chip->irq, chip);

 	return ret;
 }

 static int adp5520_remove(struct i2c_client *client)
 {
 	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);

 	if (chip->irq)
 		free_irq(chip->irq, chip);

 	adp5520_remove_subdevs(chip);
 	adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int adp5520_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);

 	adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
 	/* All other bits are W1C */
 	chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
 	adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
 	return 0;
 }

 static int adp5520_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);

 	adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
 	return 0;
 }
 #endif

 static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume);

 static const struct i2c_device_id adp5520_id[] = {
 	{ "pmic-adp5520", ID_ADP5520 },
 	{ "pmic-adp5501", ID_ADP5501 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, adp5520_id);

 static struct i2c_driver adp5520_driver = {
 	.driver = {
 		.name	= "adp5520",
 		.pm	= &adp5520_pm,
 	},
 	.probe		= adp5520_probe,
 	.remove		= adp5520_remove,
 	.id_table	= adp5520_id,
 };

 module_i2c_driver(adp5520_driver);

 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver");
 MODULE_LICENSE("GPL");
	/*
	* Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
	* LCD Backlight: drivers/video/backlight/adp5520_bl
	* LEDs : drivers/led/leds-adp5520
	* GPIO : drivers/gpio/adp5520-gpio (ADP5520 only)
	* Keys : drivers/input/keyboard/adp5520-keys (ADP5520 only)
	*
	* Copyright 2009 Analog Devices Inc.
	*
	* Derived from da903x:
	* Copyright (C) 2008 Compulab, Ltd.
	* Mike Rapoport <mike@compulab.co.il>
	*
	* Copyright (C) 2006-2008 Marvell International Ltd.
	* Eric Miao <eric.miao@marvell.com>
	*
	* Licensed under the GPL-2 or later.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/err.h>
	#include <linux/i2c.h>

	#include <linux/mfd/adp5520.h>

	struct adp5520_chip {
	struct i2c_client *client;
	struct device *dev;
	struct mutex lock;
	struct blocking_notifier_head notifier_list;
	int irq;
	unsigned long id;
	uint8_t mode;
	};

	static int __adp5520_read(struct i2c_client *client,
	int reg, uint8_t *val)
	{
	int ret;

	ret = i2c_smbus_read_byte_data(client, reg);
	if (ret < 0) {
	dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
	return ret;
	}

	*val = (uint8_t)ret;
	return 0;
	}

	static int __adp5520_write(struct i2c_client *client,
	int reg, uint8_t val)
	{
	int ret;

	ret = i2c_smbus_write_byte_data(client, reg, val);
	if (ret < 0) {
	dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
	val, reg);
	return ret;
	}
	return 0;
	}

	static int __adp5520_ack_bits(struct i2c_client *client, int reg,
	uint8_t bit_mask)
	{
	struct adp5520_chip *chip = i2c_get_clientdata(client);
	uint8_t reg_val;
	int ret;

	mutex_lock(&chip->lock);

	ret = __adp5520_read(client, reg, &reg_val);

	if (!ret) {
	reg_val \|= bit_mask;
	ret = __adp5520_write(client, reg, reg_val);
	}

	mutex_unlock(&chip->lock);
	return ret;
	}

	int adp5520_write(struct device *dev, int reg, uint8_t val)
	{
	return __adp5520_write(to_i2c_client(dev), reg, val);
	}
	EXPORT_SYMBOL_GPL(adp5520_write);

	int adp5520_read(struct device dev, int reg, uint8_t val)
	{
	return __adp5520_read(to_i2c_client(dev), reg, val);
	}
	EXPORT_SYMBOL_GPL(adp5520_read);

	int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
	{
	struct adp5520_chip *chip = dev_get_drvdata(dev);
	uint8_t reg_val;
	int ret;

	mutex_lock(&chip->lock);

	ret = __adp5520_read(chip->client, reg, &reg_val);

	if (!ret && ((reg_val & bit_mask) != bit_mask)) {
	reg_val \|= bit_mask;
	ret = __adp5520_write(chip->client, reg, reg_val);
	}

	mutex_unlock(&chip->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(adp5520_set_bits);

	int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
	{
	struct adp5520_chip *chip = dev_get_drvdata(dev);
	uint8_t reg_val;
	int ret;

	mutex_lock(&chip->lock);

	ret = __adp5520_read(chip->client, reg, &reg_val);

	if (!ret && (reg_val & bit_mask)) {
	reg_val &= ~bit_mask;
	ret = __adp5520_write(chip->client, reg, reg_val);
	}

	mutex_unlock(&chip->lock);
	return ret;
	}
	EXPORT_SYMBOL_GPL(adp5520_clr_bits);

	int adp5520_register_notifier(struct device dev, struct notifier_block nb,
	unsigned int events)
	{
	struct adp5520_chip *chip = dev_get_drvdata(dev);

	if (chip->irq) {
	adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
	events & (ADP5520_KP_IEN \| ADP5520_KR_IEN \|
	ADP5520_OVP_IEN \| ADP5520_CMPR_IEN));

	return blocking_notifier_chain_register(&chip->notifier_list,
	nb);
	}

	return -ENODEV;
	}
	EXPORT_SYMBOL_GPL(adp5520_register_notifier);

	int adp5520_unregister_notifier(struct device dev, struct notifier_block nb,
	unsigned int events)
	{
	struct adp5520_chip *chip = dev_get_drvdata(dev);

	adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
	events & (ADP5520_KP_IEN \| ADP5520_KR_IEN \|
	ADP5520_OVP_IEN \| ADP5520_CMPR_IEN));

	return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
	}
	EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);

	static irqreturn_t adp5520_irq_thread(int irq, void *data)
	{
	struct adp5520_chip *chip = data;
	unsigned int events;
	uint8_t reg_val;
	int ret;

	ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, &reg_val);
	if (ret)
	goto out;

	events = reg_val & (ADP5520_OVP_INT \| ADP5520_CMPR_INT \|
	ADP5520_GPI_INT \| ADP5520_KR_INT \| ADP5520_KP_INT);

	blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
	/* ACK, Sticky bits are W1C */
	__adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);

	out:
	return IRQ_HANDLED;
	}

	static int __remove_subdev(struct device dev, void unused)
	{
	platform_device_unregister(to_platform_device(dev));
	return 0;
	}

	static int adp5520_remove_subdevs(struct adp5520_chip *chip)
	{
	return device_for_each_child(chip->dev, NULL, __remove_subdev);
	}

	static int adp5520_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct adp5520_platform_data *pdata = dev_get_platdata(&client->dev);
	struct platform_device *pdev;
	struct adp5520_chip *chip;
	int ret;

	if (!i2c_check_functionality(client->adapter,
	I2C_FUNC_SMBUS_BYTE_DATA)) {
	dev_err(&client->dev, "SMBUS Word Data not Supported\n");
	return -EIO;
	}

	if (pdata == NULL) {
	dev_err(&client->dev, "missing platform data\n");
	return -ENODEV;
	}

	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
	return -ENOMEM;

	i2c_set_clientdata(client, chip);
	chip->client = client;

	chip->dev = &client->dev;
	chip->irq = client->irq;
	chip->id = id->driver_data;
	mutex_init(&chip->lock);

	if (chip->irq) {
	BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);

	ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
	IRQF_TRIGGER_LOW \| IRQF_ONESHOT,
	"adp5520", chip);
	if (ret) {
	dev_err(&client->dev, "failed to request irq %d\n",
	chip->irq);
	return ret;
	}
	}

	ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
	if (ret) {
	dev_err(&client->dev, "failed to write\n");
	goto out_free_irq;
	}

	if (pdata->keys) {
	pdev = platform_device_register_data(chip->dev, "adp5520-keys",
	chip->id, pdata->keys, sizeof(*pdata->keys));
	if (IS_ERR(pdev)) {
	ret = PTR_ERR(pdev);
	goto out_remove_subdevs;
	}
	}

	if (pdata->gpio) {
	pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
	chip->id, pdata->gpio, sizeof(*pdata->gpio));
	if (IS_ERR(pdev)) {
	ret = PTR_ERR(pdev);
	goto out_remove_subdevs;
	}
	}

	if (pdata->leds) {
	pdev = platform_device_register_data(chip->dev, "adp5520-led",
	chip->id, pdata->leds, sizeof(*pdata->leds));
	if (IS_ERR(pdev)) {
	ret = PTR_ERR(pdev);
	goto out_remove_subdevs;
	}
	}

	if (pdata->backlight) {
	pdev = platform_device_register_data(chip->dev,
	"adp5520-backlight",
	chip->id,
	pdata->backlight,
	sizeof(*pdata->backlight));
	if (IS_ERR(pdev)) {
	ret = PTR_ERR(pdev);
	goto out_remove_subdevs;
	}
	}

	return 0;

	out_remove_subdevs:
	adp5520_remove_subdevs(chip);

	out_free_irq:
	if (chip->irq)
	free_irq(chip->irq, chip);

	return ret;
	}

	static int adp5520_remove(struct i2c_client *client)
	{
	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);

	if (chip->irq)
	free_irq(chip->irq, chip);

	adp5520_remove_subdevs(chip);
	adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int adp5520_suspend(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);

	adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
	/* All other bits are W1C */
	chip->mode &= ADP5520_BL_EN \| ADP5520_DIM_EN \| ADP5520_nSTNBY;
	adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
	return 0;
	}

	static int adp5520_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct adp5520_chip *chip = dev_get_drvdata(&client->dev);

	adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
	return 0;
	}
	#endif

	static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume);

	static const struct i2c_device_id adp5520_id[] = {
	{ "pmic-adp5520", ID_ADP5520 },
	{ "pmic-adp5501", ID_ADP5501 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, adp5520_id);

	static struct i2c_driver adp5520_driver = {
	.driver = {
	.name = "adp5520",
	.pm = &adp5520_pm,
	},
	.probe = adp5520_probe,
	.remove = adp5520_remove,
	.id_table = adp5520_id,
	};

	module_i2c_driver(adp5520_driver);

	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
	MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver");
	MODULE_LICENSE("GPL");