samsung update 1

1 files changed, 270 insertions, 0 deletions

diff --git a/drivers/misc/mpu3050/slaveirq.c b/drivers/misc/mpu3050/slaveirq.c
new file mode 100755
index 00000000000..2ee53851e12
--- /dev/null
+++ b/drivers/misc/mpu3050/slaveirq.c
@@ -0,0 +1,270 @@
+/*
+ $License:
+    Copyright (C) 2010 InvenSense Corporation, 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.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  $
+ */
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/irq.h>
+#include <linux/signal.h>
+#include <linux/miscdevice.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <linux/poll.h>
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/wait.h>
+#include <linux/slab.h>
+
+#include "mpu.h"
+#include "slaveirq.h"
+#include "mldl_cfg.h"
+#include "mpu-i2c.h"
+
+/* function which gets slave data and sends it to SLAVE */
+
+struct slaveirq_dev_data {
+	struct miscdevice dev;
+	struct i2c_client *slave_client;
+	struct mpuirq_data data;
+	wait_queue_head_t slaveirq_wait;
+	int irq;
+	int pid;
+	int data_ready;
+	int timeout;
+};
+
+/* The following depends on patch fa1f68db6ca7ebb6fc4487ac215bffba06c01c28
+ * drivers: misc: pass miscdevice pointer via file private data
+ */
+static int slaveirq_open(struct inode *inode, struct file *file)
+{
+	/* Device node is availabe in the file->private_data, this is
+	 * exactly what we want so we leave it there */
+	struct slaveirq_dev_data *data =
+		container_of(file->private_data, struct slaveirq_dev_data, dev);
+
+	dev_dbg(data->dev.this_device,
+		"%s current->pid %d\n", __func__, current->pid);
+	data->pid = current->pid;
+	return 0;
+}
+
+static int slaveirq_release(struct inode *inode, struct file *file)
+{
+	struct slaveirq_dev_data *data =
+		container_of(file->private_data, struct slaveirq_dev_data, dev);
+	dev_dbg(data->dev.this_device, "slaveirq_release\n");
+	return 0;
+}
+
+/* read function called when from /dev/slaveirq is read */
+static ssize_t slaveirq_read(struct file *file,
+			   char *buf, size_t count, loff_t *ppos)
+{
+	int len, err;
+	struct slaveirq_dev_data *data =
+		container_of(file->private_data, struct slaveirq_dev_data, dev);
+
+	if (!data->data_ready) {
+		wait_event_interruptible_timeout(data->slaveirq_wait,
+						 data->data_ready,
+						 data->timeout);
+	}
+
+	if (data->data_ready && NULL != buf
+	    && count >= sizeof(data->data)) {
+		err = copy_to_user(buf, &data->data, sizeof(data->data));
+		data->data.data_type = 0;
+	} else {
+		return 0;
+	}
+	if (err != 0) {
+		dev_err(data->dev.this_device,
+			"Copy to user returned %d\n", err);
+		return -EFAULT;
+	}
+	data->data_ready = 0;
+	len = sizeof(data->data);
+	return len;
+}
+
+unsigned int slaveirq_poll(struct file *file, struct poll_table_struct *poll)
+{
+	int mask = 0;
+	struct slaveirq_dev_data *data =
+		container_of(file->private_data, struct slaveirq_dev_data, dev);
+
+	poll_wait(file, &data->slaveirq_wait, poll);
+	if (data->data_ready)
+		mask |= POLLIN | POLLRDNORM;
+	return mask;
+}
+
+/* ioctl - I/O control */
+static long slaveirq_ioctl(struct file *file,
+			   unsigned int cmd, unsigned long arg)
+{
+	int retval = 0;
+	int tmp;
+	struct slaveirq_dev_data *data =
+		container_of(file->private_data, struct slaveirq_dev_data, dev);
+
+	switch (cmd) {
+	case SLAVEIRQ_SET_TIMEOUT:
+		data->timeout = arg;
+		break;
+
+	case SLAVEIRQ_GET_INTERRUPT_CNT:
+		tmp = data->data.interruptcount - 1;
+		if (data->data.interruptcount > 1)
+			data->data.interruptcount = 1;
+
+		if (copy_to_user((int *) arg, &tmp, sizeof(int)))
+			return -EFAULT;
+		break;
+	case SLAVEIRQ_GET_IRQ_TIME:
+		if (copy_to_user((int *) arg, &data->data.irqtime,
+				 sizeof(data->data.irqtime)))
+			return -EFAULT;
+		data->data.irqtime = 0;
+		break;
+	default:
+		retval = -EINVAL;
+	}
+	return retval;
+}
+
+static irqreturn_t slaveirq_handler(int irq, void *dev_id)
+{
+	struct slaveirq_dev_data *data = (struct slaveirq_dev_data *)dev_id;
+	static int mycount;
+	struct timeval irqtime;
+	mycount++;
+
+	data->data.interruptcount++;
+
+	/* wake up (unblock) for reading data from userspace */
+	/* and ignore first interrupt generated in module init */
+	data->data_ready = 1;
+
+	do_gettimeofday(&irqtime);
+	data->data.irqtime = (((long long) irqtime.tv_sec) << 32);
+	data->data.irqtime += irqtime.tv_usec;
+	data->data.data_type |= 1;
+
+	wake_up_interruptible(&data->slaveirq_wait);
+
+	return IRQ_HANDLED;
+
+}
+
+/* define which file operations are supported */
+static const struct file_operations slaveirq_fops = {
+	.owner = THIS_MODULE,
+	.read = slaveirq_read,
+	.poll = slaveirq_poll,
+
+#if HAVE_COMPAT_IOCTL
+	.compat_ioctl = slaveirq_ioctl,
+#endif
+#if HAVE_UNLOCKED_IOCTL
+	.unlocked_ioctl = slaveirq_ioctl,
+#endif
+	.open = slaveirq_open,
+	.release = slaveirq_release,
+};
+
+int slaveirq_init(struct i2c_adapter *slave_adapter,
+		  struct ext_slave_platform_data *pdata,
+		  char *name)
+{
+
+	int res;
+	struct slaveirq_dev_data *data;
+
+	if (!pdata->irq)
+		return -EINVAL;
+
+	pdata->irq_data = kzalloc(sizeof(*data),
+				GFP_KERNEL);
+	data = (struct slaveirq_dev_data *) pdata->irq_data;
+	if (!data)
+		return -ENOMEM;
+
+	data->dev.minor = MISC_DYNAMIC_MINOR;
+	data->dev.name = name;
+	data->dev.fops = &slaveirq_fops;
+	data->irq = pdata->irq;
+	data->pid = 0;
+	data->data_ready = 0;
+	data->timeout = 0;
+
+	res = request_irq(data->irq, slaveirq_handler, IRQF_TRIGGER_RISING,
+			  data->dev.name, data);
+
+	if (res) {
+		dev_err(&slave_adapter->dev,
+			"myirqtest: cannot register IRQ %d\n",
+			data->irq);
+		goto out_request_irq;
+	}
+
+	res = misc_register(&data->dev);
+	if (res < 0) {
+		dev_err(&slave_adapter->dev,
+			"misc_register returned %d\n",
+			res);
+		goto out_misc_register;
+	}
+
+	init_waitqueue_head(&data->slaveirq_wait);
+	return res;
+
+out_misc_register:
+	free_irq(data->irq, data);
+out_request_irq:
+	kfree(pdata->irq_data);
+	pdata->irq_data = NULL;
+
+	return res;
+}
+
+void slaveirq_exit(struct ext_slave_platform_data *pdata)
+{
+	struct slaveirq_dev_data *data = pdata->irq_data;
+
+	if (!pdata->irq_data || data->irq <= 0)
+		return;
+
+	dev_info(data->dev.this_device, "Unregistering %s\n",
+		 data->dev.name);
+
+	free_irq(data->irq, data);
+	misc_deregister(&data->dev);
+	kfree(pdata->irq_data);
+	pdata->irq_data = NULL;
+}