drivers/mfd/pcf50633-core.c - pub/scm/linux/kernel/git/linusw/linux-gpio - 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/irq.h>
 #include <linux/slab.h>

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

 /* Two MBCS registers used during cold start */
 #define PCF50633_REG_MBCS1		0x4b
 #define PCF50633_REG_MBCS2		0x4c
 #define PCF50633_MBCS1_USBPRES 		0x01
 #define PCF50633_MBCS1_ADAPTPRES	0x01

 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,
 };

 int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
 			void (*handler) (int, void *), void *data)
 {
 	if (irq < 0 || irq > PCF50633_NUM_IRQ || !handler)
 		return -EINVAL;

 	if (WARN_ON(pcf->irq_handler[irq].handler))
 		return -EBUSY;

 	mutex_lock(&pcf->lock);
 	pcf->irq_handler[irq].handler = handler;
 	pcf->irq_handler[irq].data = data;
 	mutex_unlock(&pcf->lock);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(pcf50633_register_irq);

 int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
 {
 	if (irq < 0 || irq > PCF50633_NUM_IRQ)
 		return -EINVAL;

 	mutex_lock(&pcf->lock);
 	pcf->irq_handler[irq].handler = NULL;
 	mutex_unlock(&pcf->lock);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(pcf50633_free_irq);

 static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
 {
 	u8 reg, bits, tmp;
 	int ret = 0, idx;

 	idx = irq >> 3;
 	reg =  PCF50633_REG_INT1M + idx;
 	bits = 1 << (irq & 0x07);

 	mutex_lock(&pcf->lock);

 	if (mask) {
 		ret = __pcf50633_read(pcf, reg, 1, &tmp);
 		if (ret < 0)
 			goto out;

 		tmp |= bits;

 		ret = __pcf50633_write(pcf, reg, 1, &tmp);
 		if (ret < 0)
 			goto out;

 		pcf->mask_regs[idx] &= ~bits;
 		pcf->mask_regs[idx] |= bits;
 	} else {
 		ret = __pcf50633_read(pcf, reg, 1, &tmp);
 		if (ret < 0)
 			goto out;

 		tmp &= ~bits;

 		ret = __pcf50633_write(pcf, reg, 1, &tmp);
 		if (ret < 0)
 			goto out;

 		pcf->mask_regs[idx] &= ~bits;
 	}
 out:
 	mutex_unlock(&pcf->lock);

 	return ret;
 }

 int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
 {
 	dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);

 	return __pcf50633_irq_mask_set(pcf, irq, 1);
 }
 EXPORT_SYMBOL_GPL(pcf50633_irq_mask);

 int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
 {
 	dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);

 	return __pcf50633_irq_mask_set(pcf, irq, 0);
 }
 EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);

 int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
 {
 	u8 reg, bits;

 	reg =  irq >> 3;
 	bits = 1 << (irq & 0x07);

 	return pcf->mask_regs[reg] & bits;
 }
 EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);

 static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
 {
 	if (pcf->irq_handler[irq].handler)
 		pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
 }

 /* Maximum amount of time ONKEY is held before emergency action is taken */
 #define PCF50633_ONKEY1S_TIMEOUT 8

 static void pcf50633_irq_worker(struct work_struct *work)
 {
 	struct pcf50633 *pcf;
 	int ret, i, j;
 	u8 pcf_int[5], chgstat;

 	pcf = container_of(work, struct pcf50633, irq_work);

 	/* Read the 5 INT regs in one transaction */
 	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
 						ARRAY_SIZE(pcf_int), pcf_int);
 	if (ret != ARRAY_SIZE(pcf_int)) {
 		dev_err(pcf->dev, "Error reading INT registers\n");

 		/*
 		 * If this doesn't ACK the interrupt to the chip, we'll be
 		 * called once again as we're level triggered.
 		 */
 		goto out;
 	}

 	/* defeat 8s death from lowsys on A5 */
 	pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN,  0x04);

 	/* We immediately read the usb and adapter status. We thus make sure
 	 * only of USBINS/USBREM IRQ handlers are called */
 	if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
 		chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
 		if (chgstat & (0x3 << 4))
 			pcf_int[0] &= ~(1 << PCF50633_INT1_USBREM);
 		else
 			pcf_int[0] &= ~(1 << PCF50633_INT1_USBINS);
 	}

 	/* Make sure only one of ADPINS or ADPREM is set */
 	if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
 		chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
 		if (chgstat & (0x3 << 4))
 			pcf_int[0] &= ~(1 << PCF50633_INT1_ADPREM);
 		else
 			pcf_int[0] &= ~(1 << PCF50633_INT1_ADPINS);
 	}

 	dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
 			"INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
 			pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);

 	/* Some revisions of the chip don't have a 8s standby mode on
 	 * ONKEY1S press. We try to manually do it in such cases. */
 	if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
 		dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
 							pcf->onkey1s_held);
 		if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
 			if (pcf->pdata->force_shutdown)
 				pcf->pdata->force_shutdown(pcf);
 	}

 	if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
 		dev_info(pcf->dev, "ONKEY1S held\n");
 		pcf->onkey1s_held = 1 ;

 		/* Unmask IRQ_SECOND */
 		pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
 						PCF50633_INT1_SECOND);

 		/* Unmask IRQ_ONKEYR */
 		pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
 						PCF50633_INT2_ONKEYR);
 	}

 	if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
 		pcf->onkey1s_held = 0;

 		/* Mask SECOND and ONKEYR interrupts */
 		if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
 			pcf50633_reg_set_bit_mask(pcf,
 					PCF50633_REG_INT1M,
 					PCF50633_INT1_SECOND,
 					PCF50633_INT1_SECOND);

 		if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
 			pcf50633_reg_set_bit_mask(pcf,
 					PCF50633_REG_INT2M,
 					PCF50633_INT2_ONKEYR,
 					PCF50633_INT2_ONKEYR);
 	}

 	/* Have we just resumed ? */
 	if (pcf->is_suspended) {
 		pcf->is_suspended = 0;

 		/* Set the resume reason filtering out non resumers */
 		for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
 			pcf->resume_reason[i] = pcf_int[i] &
 						pcf->pdata->resumers[i];

 		/* Make sure we don't pass on any ONKEY events to
 		 * userspace now */
 		pcf_int[1] &= ~(PCF50633_INT2_ONKEYR | PCF50633_INT2_ONKEYF);
 	}

 	for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
 		/* Unset masked interrupts */
 		pcf_int[i] &= ~pcf->mask_regs[i];

 		for (j = 0; j < 8 ; j++)
 			if (pcf_int[i] & (1 << j))
 				pcf50633_irq_call_handler(pcf, (i * 8) + j);
 	}

 out:
 	put_device(pcf->dev);
 	enable_irq(pcf->irq);
 }

 static irqreturn_t pcf50633_irq(int irq, void *data)
 {
 	struct pcf50633 *pcf = data;

 	dev_dbg(pcf->dev, "pcf50633_irq\n");

 	get_device(pcf->dev);
 	disable_irq_nosync(pcf->irq);
 	queue_work(pcf->work_queue, &pcf->irq_work);

 	return IRQ_HANDLED;
 }

 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;
 	int ret = 0, i;
 	u8 res[5];

 	pcf = i2c_get_clientdata(client);

 	/* Make sure our interrupt handlers are not called
 	 * henceforth */
 	disable_irq(pcf->irq);

 	/* Make sure that any running IRQ worker has quit */
 	cancel_work_sync(&pcf->irq_work);

 	/* Save the masks */
 	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
 				ARRAY_SIZE(pcf->suspend_irq_masks),
 					pcf->suspend_irq_masks);
 	if (ret < 0) {
 		dev_err(pcf->dev, "error saving irq masks\n");
 		goto out;
 	}

 	/* Write wakeup irq masks */
 	for (i = 0; i < ARRAY_SIZE(res); i++)
 		res[i] = ~pcf->pdata->resumers[i];

 	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
 					ARRAY_SIZE(res), &res[0]);
 	if (ret < 0) {
 		dev_err(pcf->dev, "error writing wakeup irq masks\n");
 		goto out;
 	}

 	pcf->is_suspended = 1;

 out:
 	return ret;
 }

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

 	pcf = i2c_get_clientdata(client);

 	/* Write the saved mask registers */
 	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
 				ARRAY_SIZE(pcf->suspend_irq_masks),
 					pcf->suspend_irq_masks);
 	if (ret < 0)
 		dev_err(pcf->dev, "Error restoring saved suspend masks\n");

 	/* Restore regulators' state */


 	get_device(pcf->dev);

 	/*
 	 * Clear any pending interrupts and set resume reason if any.
 	 * This will leave with enable_irq()
 	 */
 	pcf50633_irq_worker(&pcf->irq_work);

 	return 0;
 }
 #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;
 	pcf->irq = client->irq;
 	pcf->work_queue = create_singlethread_workqueue("pcf50633");

 	if (!pcf->work_queue) {
 		dev_err(&client->dev, "Failed to alloc workqueue\n");
 		ret = -ENOMEM;
 		goto err_free;
 	}

 	INIT_WORK(&pcf->irq_work, pcf50633_irq_worker);

 	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_destroy_workqueue;
 	}

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

 	/* Enable all interrupts except RTC SECOND */
 	pcf->mask_regs[0] = 0x80;
 	pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
 	pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);

 	ret = request_irq(client->irq, pcf50633_irq,
 					IRQF_TRIGGER_LOW, "pcf50633", pcf);

 	if (ret) {
 		dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
 		goto err_destroy_workqueue;
 	}

 	/* 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);

 	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);
 	}

 	if (enable_irq_wake(client->irq) < 0)
 		dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
 			"in this hardware revision", client->irq);

 	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_destroy_workqueue:
 	destroy_workqueue(pcf->work_queue);
 err_free:
 	i2c_set_clientdata(client, NULL);
 	kfree(pcf);

 	return ret;
 }

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

 	free_irq(pcf->irq, pcf);
 	destroy_workqueue(pcf->work_queue);

 	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/irq.h>
	#include <linux/slab.h>

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

	/* Two MBCS registers used during cold start */
	#define PCF50633_REG_MBCS1 0x4b
	#define PCF50633_REG_MBCS2 0x4c
	#define PCF50633_MBCS1_USBPRES 0x01
	#define PCF50633_MBCS1_ADAPTPRES 0x01

	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,
	};

	int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
	void (handler) (int, void ), void *data)
	{
	if (irq < 0 \|\| irq > PCF50633_NUM_IRQ \|\| !handler)
	return -EINVAL;

	if (WARN_ON(pcf->irq_handler[irq].handler))
	return -EBUSY;

	mutex_lock(&pcf->lock);
	pcf->irq_handler[irq].handler = handler;
	pcf->irq_handler[irq].data = data;
	mutex_unlock(&pcf->lock);

	return 0;
	}
	EXPORT_SYMBOL_GPL(pcf50633_register_irq);

	int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
	{
	if (irq < 0 \|\| irq > PCF50633_NUM_IRQ)
	return -EINVAL;

	mutex_lock(&pcf->lock);
	pcf->irq_handler[irq].handler = NULL;
	mutex_unlock(&pcf->lock);

	return 0;
	}
	EXPORT_SYMBOL_GPL(pcf50633_free_irq);

	static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
	{
	u8 reg, bits, tmp;
	int ret = 0, idx;

	idx = irq >> 3;
	reg = PCF50633_REG_INT1M + idx;
	bits = 1 << (irq & 0x07);

	mutex_lock(&pcf->lock);

	if (mask) {
	ret = __pcf50633_read(pcf, reg, 1, &tmp);
	if (ret < 0)
	goto out;

	tmp \|= bits;

	ret = __pcf50633_write(pcf, reg, 1, &tmp);
	if (ret < 0)
	goto out;

	pcf->mask_regs[idx] &= ~bits;
	pcf->mask_regs[idx] \|= bits;
	} else {
	ret = __pcf50633_read(pcf, reg, 1, &tmp);
	if (ret < 0)
	goto out;

	tmp &= ~bits;

	ret = __pcf50633_write(pcf, reg, 1, &tmp);
	if (ret < 0)
	goto out;

	pcf->mask_regs[idx] &= ~bits;
	}
	out:
	mutex_unlock(&pcf->lock);

	return ret;
	}

	int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
	{
	dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);

	return __pcf50633_irq_mask_set(pcf, irq, 1);
	}
	EXPORT_SYMBOL_GPL(pcf50633_irq_mask);

	int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
	{
	dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);

	return __pcf50633_irq_mask_set(pcf, irq, 0);
	}
	EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);

	int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
	{
	u8 reg, bits;

	reg = irq >> 3;
	bits = 1 << (irq & 0x07);

	return pcf->mask_regs[reg] & bits;
	}
	EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);

	static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
	{
	if (pcf->irq_handler[irq].handler)
	pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
	}

	/* Maximum amount of time ONKEY is held before emergency action is taken */
	#define PCF50633_ONKEY1S_TIMEOUT 8

	static void pcf50633_irq_worker(struct work_struct *work)
	{
	struct pcf50633 *pcf;
	int ret, i, j;
	u8 pcf_int[5], chgstat;

	pcf = container_of(work, struct pcf50633, irq_work);

	/* Read the 5 INT regs in one transaction */
	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
	ARRAY_SIZE(pcf_int), pcf_int);
	if (ret != ARRAY_SIZE(pcf_int)) {
	dev_err(pcf->dev, "Error reading INT registers\n");

	/*
	* If this doesn't ACK the interrupt to the chip, we'll be
	* called once again as we're level triggered.
	*/
	goto out;
	}

	/* defeat 8s death from lowsys on A5 */
	pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN, 0x04);

	/* We immediately read the usb and adapter status. We thus make sure
	* only of USBINS/USBREM IRQ handlers are called */
	if (pcf_int[0] & (PCF50633_INT1_USBINS \| PCF50633_INT1_USBREM)) {
	chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
	if (chgstat & (0x3 << 4))
	pcf_int[0] &= ~(1 << PCF50633_INT1_USBREM);
	else
	pcf_int[0] &= ~(1 << PCF50633_INT1_USBINS);
	}

	/* Make sure only one of ADPINS or ADPREM is set */
	if (pcf_int[0] & (PCF50633_INT1_ADPINS \| PCF50633_INT1_ADPREM)) {
	chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
	if (chgstat & (0x3 << 4))
	pcf_int[0] &= ~(1 << PCF50633_INT1_ADPREM);
	else
	pcf_int[0] &= ~(1 << PCF50633_INT1_ADPINS);
	}

	dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
	"INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
	pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);

	/* Some revisions of the chip don't have a 8s standby mode on
	* ONKEY1S press. We try to manually do it in such cases. */
	if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
	dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
	pcf->onkey1s_held);
	if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
	if (pcf->pdata->force_shutdown)
	pcf->pdata->force_shutdown(pcf);
	}

	if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
	dev_info(pcf->dev, "ONKEY1S held\n");
	pcf->onkey1s_held = 1 ;

	/* Unmask IRQ_SECOND */
	pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
	PCF50633_INT1_SECOND);

	/* Unmask IRQ_ONKEYR */
	pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
	PCF50633_INT2_ONKEYR);
	}

	if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
	pcf->onkey1s_held = 0;

	/* Mask SECOND and ONKEYR interrupts */
	if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
	pcf50633_reg_set_bit_mask(pcf,
	PCF50633_REG_INT1M,
	PCF50633_INT1_SECOND,
	PCF50633_INT1_SECOND);

	if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
	pcf50633_reg_set_bit_mask(pcf,
	PCF50633_REG_INT2M,
	PCF50633_INT2_ONKEYR,
	PCF50633_INT2_ONKEYR);
	}

	/* Have we just resumed ? */
	if (pcf->is_suspended) {
	pcf->is_suspended = 0;

	/* Set the resume reason filtering out non resumers */
	for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
	pcf->resume_reason[i] = pcf_int[i] &
	pcf->pdata->resumers[i];

	/* Make sure we don't pass on any ONKEY events to
	* userspace now */
	pcf_int[1] &= ~(PCF50633_INT2_ONKEYR \| PCF50633_INT2_ONKEYF);
	}

	for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
	/* Unset masked interrupts */
	pcf_int[i] &= ~pcf->mask_regs[i];

	for (j = 0; j < 8 ; j++)
	if (pcf_int[i] & (1 << j))
	pcf50633_irq_call_handler(pcf, (i * 8) + j);
	}

	out:
	put_device(pcf->dev);
	enable_irq(pcf->irq);
	}

	static irqreturn_t pcf50633_irq(int irq, void *data)
	{
	struct pcf50633 *pcf = data;

	dev_dbg(pcf->dev, "pcf50633_irq\n");

	get_device(pcf->dev);
	disable_irq_nosync(pcf->irq);
	queue_work(pcf->work_queue, &pcf->irq_work);

	return IRQ_HANDLED;
	}

	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;
	int ret = 0, i;
	u8 res[5];

	pcf = i2c_get_clientdata(client);

	/* Make sure our interrupt handlers are not called
	* henceforth */
	disable_irq(pcf->irq);

	/* Make sure that any running IRQ worker has quit */
	cancel_work_sync(&pcf->irq_work);

	/* Save the masks */
	ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
	ARRAY_SIZE(pcf->suspend_irq_masks),
	pcf->suspend_irq_masks);
	if (ret < 0) {
	dev_err(pcf->dev, "error saving irq masks\n");
	goto out;
	}

	/* Write wakeup irq masks */
	for (i = 0; i < ARRAY_SIZE(res); i++)
	res[i] = ~pcf->pdata->resumers[i];

	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
	ARRAY_SIZE(res), &res[0]);
	if (ret < 0) {
	dev_err(pcf->dev, "error writing wakeup irq masks\n");
	goto out;
	}

	pcf->is_suspended = 1;

	out:
	return ret;
	}

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

	pcf = i2c_get_clientdata(client);

	/* Write the saved mask registers */
	ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
	ARRAY_SIZE(pcf->suspend_irq_masks),
	pcf->suspend_irq_masks);
	if (ret < 0)
	dev_err(pcf->dev, "Error restoring saved suspend masks\n");

	/* Restore regulators' state */


	get_device(pcf->dev);

	/*
	* Clear any pending interrupts and set resume reason if any.
	* This will leave with enable_irq()
	*/
	pcf50633_irq_worker(&pcf->irq_work);

	return 0;
	}
	#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;
	pcf->irq = client->irq;
	pcf->work_queue = create_singlethread_workqueue("pcf50633");

	if (!pcf->work_queue) {
	dev_err(&client->dev, "Failed to alloc workqueue\n");
	ret = -ENOMEM;
	goto err_free;
	}

	INIT_WORK(&pcf->irq_work, pcf50633_irq_worker);

	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_destroy_workqueue;
	}

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

	/* Enable all interrupts except RTC SECOND */
	pcf->mask_regs[0] = 0x80;
	pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
	pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
	pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
	pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
	pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);

	ret = request_irq(client->irq, pcf50633_irq,
	IRQF_TRIGGER_LOW, "pcf50633", pcf);

	if (ret) {
	dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
	goto err_destroy_workqueue;
	}

	/* 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);

	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);
	}

	if (enable_irq_wake(client->irq) < 0)
	dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
	"in this hardware revision", client->irq);

	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_destroy_workqueue:
	destroy_workqueue(pcf->work_queue);
	err_free:
	i2c_set_clientdata(client, NULL);
	kfree(pcf);

	return ret;
	}

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

	free_irq(pcf->irq, pcf);
	destroy_workqueue(pcf->work_queue);

	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);