drivers/mfd/pcf50633-core.c - kernel/skids - Git at Google

 /* NXP PCF50633 Power Management Unit (PMU) driver
  *
  * (C) 2006-2008 by Openmoko, Inc.
  * Author: Harald Welte <laforge@openmoko.org>
  * 	   Balaji Rao <balajirrao@openmoko.org>
  * All rights reserved.
  *
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
  *  option) any later version.
  *
  */

 #include <linux/kernel.h>
 #include <linux/device.h>
 #include <linux/sysfs.h>
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
 #include <linux/platform_device.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>

 #include <linux/mfd/pcf50633/core.h>

 int pcf50633_irq_init(struct pcf50633 *pcf, int irq);
 void pcf50633_irq_free(struct pcf50633 *pcf);
 #ifdef CONFIG_PM
 int pcf50633_irq_suspend(struct pcf50633 *pcf);
 int pcf50633_irq_resume(struct pcf50633 *pcf);
 #endif

 static int __pcf50633_read(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
 {
 	int ret;

 	ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg,
 				num, data);
 	if (ret < 0)
 		dev_err(pcf->dev, "Error reading %d regs at %d\n", num, reg);

 	return ret;
 }

 static int __pcf50633_write(struct pcf50633 *pcf, u8 reg, int num, u8 *data)
 {
 	int ret;

 	ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg,
 				num, data);
 	if (ret < 0)
 		dev_err(pcf->dev, "Error writing %d regs at %d\n", num, reg);

 	return ret;

 }

 /* Read a block of upto 32 regs  */
 int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
 					int nr_regs, u8 *data)
 {
 	int ret;

 	mutex_lock(&pcf->lock);
 	ret = __pcf50633_read(pcf, reg, nr_regs, data);
 	mutex_unlock(&pcf->lock);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(pcf50633_read_block);

 /* Write a block of upto 32 regs  */
 int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
 					int nr_regs, u8 *data)
 {
 	int ret;

 	mutex_lock(&pcf->lock);
 	ret = __pcf50633_write(pcf, reg, nr_regs, data);
 	mutex_unlock(&pcf->lock);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(pcf50633_write_block);

 u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
 {
 	u8 val;

 	mutex_lock(&pcf->lock);
 	__pcf50633_read(pcf, reg, 1, &val);
 	mutex_unlock(&pcf->lock);

 	return val;
 }
 EXPORT_SYMBOL_GPL(pcf50633_reg_read);

 int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
 {
 	int ret;

 	mutex_lock(&pcf->lock);
 	ret = __pcf50633_write(pcf, reg, 1, &val);
 	mutex_unlock(&pcf->lock);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(pcf50633_reg_write);

 int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
 {
 	int ret;
 	u8 tmp;

 	val &= mask;

 	mutex_lock(&pcf->lock);
 	ret = __pcf50633_read(pcf, reg, 1, &tmp);
 	if (ret < 0)
 		goto out;

 	tmp &= ~mask;
 	tmp |= val;
 	ret = __pcf50633_write(pcf, reg, 1, &tmp);

 out:
 	mutex_unlock(&pcf->lock);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);

 int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
 {
 	int ret;
 	u8 tmp;

 	mutex_lock(&pcf->lock);
 	ret = __pcf50633_read(pcf, reg, 1, &tmp);
 	if (ret < 0)
 		goto out;

 	tmp &= ~val;
 	ret = __pcf50633_write(pcf, reg, 1, &tmp);

 out:
 	mutex_unlock(&pcf->lock);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);

 /* sysfs attributes */
 static ssize_t show_dump_regs(struct device *dev, struct device_attribute *attr,
 			    char *buf)
 {
 	struct pcf50633 *pcf = dev_get_drvdata(dev);
 	u8 dump[16];
 	int n, n1, idx = 0;
 	char *buf1 = buf;
 	static u8 address_no_read[] = { /* must be ascending */
 		PCF50633_REG_INT1,
 		PCF50633_REG_INT2,
 		PCF50633_REG_INT3,
 		PCF50633_REG_INT4,
 		PCF50633_REG_INT5,
 		0 /* terminator */
 	};

 	for (n = 0; n < 256; n += sizeof(dump)) {
 		for (n1 = 0; n1 < sizeof(dump); n1++)
 			if (n == address_no_read[idx]) {
 				idx++;
 				dump[n1] = 0x00;
 			} else
 				dump[n1] = pcf50633_reg_read(pcf, n + n1);

 		hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
 		buf1 += strlen(buf1);
 		*buf1++ = '\n';
 		*buf1 = '\0';
 	}

 	return buf1 - buf;
 }
 static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);

 static ssize_t show_resume_reason(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct pcf50633 *pcf = dev_get_drvdata(dev);
 	int n;

 	n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
 				pcf->resume_reason[0],
 				pcf->resume_reason[1],
 				pcf->resume_reason[2],
 				pcf->resume_reason[3],
 				pcf->resume_reason[4]);

 	return n;
 }
 static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);

 static struct attribute *pcf_sysfs_entries[] = {
 	&dev_attr_dump_regs.attr,
 	&dev_attr_resume_reason.attr,
 	NULL,
 };

 static struct attribute_group pcf_attr_group = {
 	.name	= NULL,			/* put in device directory */
 	.attrs	= pcf_sysfs_entries,
 };

 static void
 pcf50633_client_dev_register(struct pcf50633 *pcf, const char *name,
 						struct platform_device **pdev)
 {
 	int ret;

 	*pdev = platform_device_alloc(name, -1);
 	if (!*pdev) {
 		dev_err(pcf->dev, "Falied to allocate %s\n", name);
 		return;
 	}

 	(*pdev)->dev.parent = pcf->dev;

 	ret = platform_device_add(*pdev);
 	if (ret) {
 		dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
 		platform_device_put(*pdev);
 		*pdev = NULL;
 	}
 }

 #ifdef CONFIG_PM
 static int pcf50633_suspend(struct i2c_client *client, pm_message_t state)
 {
 	struct pcf50633 *pcf;
 	pcf = i2c_get_clientdata(client);

 	return pcf50633_irq_suspend(pcf);
 }

 static int pcf50633_resume(struct i2c_client *client)
 {
 	struct pcf50633 *pcf;
 	pcf = i2c_get_clientdata(client);

 	return pcf50633_irq_resume(pcf);
 }
 #else
 #define pcf50633_suspend NULL
 #define pcf50633_resume NULL
 #endif

 static int __devinit pcf50633_probe(struct i2c_client *client,
 				const struct i2c_device_id *ids)
 {
 	struct pcf50633 *pcf;
 	struct pcf50633_platform_data *pdata = client->dev.platform_data;
 	int i, ret;
 	int version, variant;

 	if (!client->irq) {
 		dev_err(&client->dev, "Missing IRQ\n");
 		return -ENOENT;
 	}

 	pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
 	if (!pcf)
 		return -ENOMEM;

 	pcf->pdata = pdata;

 	mutex_init(&pcf->lock);

 	i2c_set_clientdata(client, pcf);
 	pcf->dev = &client->dev;
 	pcf->i2c_client = client;

 	version = pcf50633_reg_read(pcf, 0);
 	variant = pcf50633_reg_read(pcf, 1);
 	if (version < 0 || variant < 0) {
 		dev_err(pcf->dev, "Unable to probe pcf50633\n");
 		ret = -ENODEV;
 		goto err_free;
 	}

 	dev_info(pcf->dev, "Probed device version %d variant %d\n",
 							version, variant);

 	pcf50633_irq_init(pcf, client->irq);

 	/* Create sub devices */
 	pcf50633_client_dev_register(pcf, "pcf50633-input",
 						&pcf->input_pdev);
 	pcf50633_client_dev_register(pcf, "pcf50633-rtc",
 						&pcf->rtc_pdev);
 	pcf50633_client_dev_register(pcf, "pcf50633-mbc",
 						&pcf->mbc_pdev);
 	pcf50633_client_dev_register(pcf, "pcf50633-adc",
 						&pcf->adc_pdev);
 	pcf50633_client_dev_register(pcf, "pcf50633-backlight",
 						&pcf->bl_pdev);


 	for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
 		struct platform_device *pdev;

 		pdev = platform_device_alloc("pcf50633-regltr", i);
 		if (!pdev) {
 			dev_err(pcf->dev, "Cannot create regulator %d\n", i);
 			continue;
 		}

 		pdev->dev.parent = pcf->dev;
 		platform_device_add_data(pdev, &pdata->reg_init_data[i],
 					sizeof(pdata->reg_init_data[i]));
 		pcf->regulator_pdev[i] = pdev;

 		platform_device_add(pdev);
 	}

 	ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
 	if (ret)
 		dev_err(pcf->dev, "error creating sysfs entries\n");

 	if (pdata->probe_done)
 		pdata->probe_done(pcf);

 	return 0;

 err_free:
 	kfree(pcf);

 	return ret;
 }

 static int __devexit pcf50633_remove(struct i2c_client *client)
 {
 	struct pcf50633 *pcf = i2c_get_clientdata(client);
 	int i;

 	pcf50633_irq_free(pcf);

 	platform_device_unregister(pcf->input_pdev);
 	platform_device_unregister(pcf->rtc_pdev);
 	platform_device_unregister(pcf->mbc_pdev);
 	platform_device_unregister(pcf->adc_pdev);

 	for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
 		platform_device_unregister(pcf->regulator_pdev[i]);

 	kfree(pcf);

 	return 0;
 }

 static struct i2c_device_id pcf50633_id_table[] = {
 	{"pcf50633", 0x73},
 	{/* end of list */}
 };

 static struct i2c_driver pcf50633_driver = {
 	.driver = {
 		.name	= "pcf50633",
 	},
 	.id_table = pcf50633_id_table,
 	.probe = pcf50633_probe,
 	.remove = __devexit_p(pcf50633_remove),
 	.suspend = pcf50633_suspend,
 	.resume	= pcf50633_resume,
 };

 static int __init pcf50633_init(void)
 {
 	return i2c_add_driver(&pcf50633_driver);
 }

 static void __exit pcf50633_exit(void)
 {
 	i2c_del_driver(&pcf50633_driver);
 }

 MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
 MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
 MODULE_LICENSE("GPL");

 subsys_initcall(pcf50633_init);
 module_exit(pcf50633_exit);
	/* NXP PCF50633 Power Management Unit (PMU) driver
	*
	* (C) 2006-2008 by Openmoko, Inc.
	* Author: Harald Welte <laforge@openmoko.org>
	* Balaji Rao <balajirrao@openmoko.org>
	* All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or (at your
	* option) any later version.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/device.h>
	#include <linux/sysfs.h>
	#include <linux/module.h>
	#include <linux/types.h>
	#include <linux/interrupt.h>
	#include <linux/workqueue.h>
	#include <linux/platform_device.h>
	#include <linux/i2c.h>
	#include <linux/slab.h>

	#include <linux/mfd/pcf50633/core.h>

	int pcf50633_irq_init(struct pcf50633 *pcf, int irq);
	void pcf50633_irq_free(struct pcf50633 *pcf);
	#ifdef CONFIG_PM
	int pcf50633_irq_suspend(struct pcf50633 *pcf);
	int pcf50633_irq_resume(struct pcf50633 *pcf);
	#endif

	static int __pcf50633_read(struct pcf50633 pcf, u8 reg, int num, u8 data)
	{
	int ret;

	ret = i2c_smbus_read_i2c_block_data(pcf->i2c_client, reg,
	num, data);
	if (ret < 0)
	dev_err(pcf->dev, "Error reading %d regs at %d\n", num, reg);

	return ret;
	}

	static int __pcf50633_write(struct pcf50633 pcf, u8 reg, int num, u8 data)
	{
	int ret;

	ret = i2c_smbus_write_i2c_block_data(pcf->i2c_client, reg,
	num, data);
	if (ret < 0)
	dev_err(pcf->dev, "Error writing %d regs at %d\n", num, reg);

	return ret;

	}

	/* Read a block of upto 32 regs */
	int pcf50633_read_block(struct pcf50633 *pcf, u8 reg,
	int nr_regs, u8 *data)
	{
	int ret;

	mutex_lock(&pcf->lock);
	ret = __pcf50633_read(pcf, reg, nr_regs, data);
	mutex_unlock(&pcf->lock);

	return ret;
	}
	EXPORT_SYMBOL_GPL(pcf50633_read_block);

	/* Write a block of upto 32 regs */
	int pcf50633_write_block(struct pcf50633 *pcf , u8 reg,
	int nr_regs, u8 *data)
	{
	int ret;

	mutex_lock(&pcf->lock);
	ret = __pcf50633_write(pcf, reg, nr_regs, data);
	mutex_unlock(&pcf->lock);

	return ret;
	}
	EXPORT_SYMBOL_GPL(pcf50633_write_block);

	u8 pcf50633_reg_read(struct pcf50633 *pcf, u8 reg)
	{
	u8 val;

	mutex_lock(&pcf->lock);
	__pcf50633_read(pcf, reg, 1, &val);
	mutex_unlock(&pcf->lock);

	return val;
	}
	EXPORT_SYMBOL_GPL(pcf50633_reg_read);

	int pcf50633_reg_write(struct pcf50633 *pcf, u8 reg, u8 val)
	{
	int ret;

	mutex_lock(&pcf->lock);
	ret = __pcf50633_write(pcf, reg, 1, &val);
	mutex_unlock(&pcf->lock);

	return ret;
	}
	EXPORT_SYMBOL_GPL(pcf50633_reg_write);

	int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
	{
	int ret;
	u8 tmp;

	val &= mask;

	mutex_lock(&pcf->lock);
	ret = __pcf50633_read(pcf, reg, 1, &tmp);
	if (ret < 0)
	goto out;

	tmp &= ~mask;
	tmp \|= val;
	ret = __pcf50633_write(pcf, reg, 1, &tmp);

	out:
	mutex_unlock(&pcf->lock);

	return ret;
	}
	EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);

	int pcf50633_reg_clear_bits(struct pcf50633 *pcf, u8 reg, u8 val)
	{
	int ret;
	u8 tmp;

	mutex_lock(&pcf->lock);
	ret = __pcf50633_read(pcf, reg, 1, &tmp);
	if (ret < 0)
	goto out;

	tmp &= ~val;
	ret = __pcf50633_write(pcf, reg, 1, &tmp);

	out:
	mutex_unlock(&pcf->lock);

	return ret;
	}
	EXPORT_SYMBOL_GPL(pcf50633_reg_clear_bits);

	/* sysfs attributes */
	static ssize_t show_dump_regs(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct pcf50633 *pcf = dev_get_drvdata(dev);
	u8 dump[16];
	int n, n1, idx = 0;
	char *buf1 = buf;
	static u8 address_no_read[] = { /* must be ascending */
	PCF50633_REG_INT1,
	PCF50633_REG_INT2,
	PCF50633_REG_INT3,
	PCF50633_REG_INT4,
	PCF50633_REG_INT5,
	0 /* terminator */
	};

	for (n = 0; n < 256; n += sizeof(dump)) {
	for (n1 = 0; n1 < sizeof(dump); n1++)
	if (n == address_no_read[idx]) {
	idx++;
	dump[n1] = 0x00;
	} else
	dump[n1] = pcf50633_reg_read(pcf, n + n1);

	hex_dump_to_buffer(dump, sizeof(dump), 16, 1, buf1, 128, 0);
	buf1 += strlen(buf1);
	*buf1++ = '\n';
	*buf1 = '\0';
	}

	return buf1 - buf;
	}
	static DEVICE_ATTR(dump_regs, 0400, show_dump_regs, NULL);

	static ssize_t show_resume_reason(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct pcf50633 *pcf = dev_get_drvdata(dev);
	int n;

	n = sprintf(buf, "%02x%02x%02x%02x%02x\n",
	pcf->resume_reason[0],
	pcf->resume_reason[1],
	pcf->resume_reason[2],
	pcf->resume_reason[3],
	pcf->resume_reason[4]);

	return n;
	}
	static DEVICE_ATTR(resume_reason, 0400, show_resume_reason, NULL);

	static struct attribute *pcf_sysfs_entries[] = {
	&dev_attr_dump_regs.attr,
	&dev_attr_resume_reason.attr,
	NULL,
	};

	static struct attribute_group pcf_attr_group = {
	.name = NULL, /* put in device directory */
	.attrs = pcf_sysfs_entries,
	};

	static void
	pcf50633_client_dev_register(struct pcf50633 pcf, const char name,
	struct platform_device **pdev)
	{
	int ret;

	*pdev = platform_device_alloc(name, -1);
	if (!*pdev) {
	dev_err(pcf->dev, "Falied to allocate %s\n", name);
	return;
	}

	(*pdev)->dev.parent = pcf->dev;

	ret = platform_device_add(*pdev);
	if (ret) {
	dev_err(pcf->dev, "Failed to register %s: %d\n", name, ret);
	platform_device_put(*pdev);
	*pdev = NULL;
	}
	}

	#ifdef CONFIG_PM
	static int pcf50633_suspend(struct i2c_client *client, pm_message_t state)
	{
	struct pcf50633 *pcf;
	pcf = i2c_get_clientdata(client);

	return pcf50633_irq_suspend(pcf);
	}

	static int pcf50633_resume(struct i2c_client *client)
	{
	struct pcf50633 *pcf;
	pcf = i2c_get_clientdata(client);

	return pcf50633_irq_resume(pcf);
	}
	#else
	#define pcf50633_suspend NULL
	#define pcf50633_resume NULL
	#endif

	static int __devinit pcf50633_probe(struct i2c_client *client,
	const struct i2c_device_id *ids)
	{
	struct pcf50633 *pcf;
	struct pcf50633_platform_data *pdata = client->dev.platform_data;
	int i, ret;
	int version, variant;

	if (!client->irq) {
	dev_err(&client->dev, "Missing IRQ\n");
	return -ENOENT;
	}

	pcf = kzalloc(sizeof(*pcf), GFP_KERNEL);
	if (!pcf)
	return -ENOMEM;

	pcf->pdata = pdata;

	mutex_init(&pcf->lock);

	i2c_set_clientdata(client, pcf);
	pcf->dev = &client->dev;
	pcf->i2c_client = client;

	version = pcf50633_reg_read(pcf, 0);
	variant = pcf50633_reg_read(pcf, 1);
	if (version < 0 \|\| variant < 0) {
	dev_err(pcf->dev, "Unable to probe pcf50633\n");
	ret = -ENODEV;
	goto err_free;
	}

	dev_info(pcf->dev, "Probed device version %d variant %d\n",
	version, variant);

	pcf50633_irq_init(pcf, client->irq);

	/* Create sub devices */
	pcf50633_client_dev_register(pcf, "pcf50633-input",
	&pcf->input_pdev);
	pcf50633_client_dev_register(pcf, "pcf50633-rtc",
	&pcf->rtc_pdev);
	pcf50633_client_dev_register(pcf, "pcf50633-mbc",
	&pcf->mbc_pdev);
	pcf50633_client_dev_register(pcf, "pcf50633-adc",
	&pcf->adc_pdev);
	pcf50633_client_dev_register(pcf, "pcf50633-backlight",
	&pcf->bl_pdev);


	for (i = 0; i < PCF50633_NUM_REGULATORS; i++) {
	struct platform_device *pdev;

	pdev = platform_device_alloc("pcf50633-regltr", i);
	if (!pdev) {
	dev_err(pcf->dev, "Cannot create regulator %d\n", i);
	continue;
	}

	pdev->dev.parent = pcf->dev;
	platform_device_add_data(pdev, &pdata->reg_init_data[i],
	sizeof(pdata->reg_init_data[i]));
	pcf->regulator_pdev[i] = pdev;

	platform_device_add(pdev);
	}

	ret = sysfs_create_group(&client->dev.kobj, &pcf_attr_group);
	if (ret)
	dev_err(pcf->dev, "error creating sysfs entries\n");

	if (pdata->probe_done)
	pdata->probe_done(pcf);

	return 0;

	err_free:
	kfree(pcf);

	return ret;
	}

	static int __devexit pcf50633_remove(struct i2c_client *client)
	{
	struct pcf50633 *pcf = i2c_get_clientdata(client);
	int i;

	pcf50633_irq_free(pcf);

	platform_device_unregister(pcf->input_pdev);
	platform_device_unregister(pcf->rtc_pdev);
	platform_device_unregister(pcf->mbc_pdev);
	platform_device_unregister(pcf->adc_pdev);

	for (i = 0; i < PCF50633_NUM_REGULATORS; i++)
	platform_device_unregister(pcf->regulator_pdev[i]);

	kfree(pcf);

	return 0;
	}

	static struct i2c_device_id pcf50633_id_table[] = {
	{"pcf50633", 0x73},
	{/* end of list */}
	};

	static struct i2c_driver pcf50633_driver = {
	.driver = {
	.name = "pcf50633",
	},
	.id_table = pcf50633_id_table,
	.probe = pcf50633_probe,
	.remove = __devexit_p(pcf50633_remove),
	.suspend = pcf50633_suspend,
	.resume = pcf50633_resume,
	};

	static int __init pcf50633_init(void)
	{
	return i2c_add_driver(&pcf50633_driver);
	}

	static void __exit pcf50633_exit(void)
	{
	i2c_del_driver(&pcf50633_driver);
	}

	MODULE_DESCRIPTION("I2C chip driver for NXP PCF50633 PMU");
	MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
	MODULE_LICENSE("GPL");

	subsys_initcall(pcf50633_init);
	module_exit(pcf50633_exit);