1 files changed, 268 insertions, 0 deletions

diff --git a/drivers/misc/inv_mpu/slaveirq.c b/drivers/misc/inv_mpu/slaveirq.c
new file mode 100644
index 00000000000..22cfa4e458e
--- /dev/null
+++ b/drivers/misc/inv_mpu/slaveirq.c
@@ -0,0 +1,268 @@
+/*
+        $License:
+        Copyright (C) 2011 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 <linux/mpu.h>
+#include "slaveirq.h"
+#include "mldl_cfg.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 && data->timeout &&
+            !(file->f_flags & O_NONBLOCK)) {
+                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;
+}
+
+static 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 */
+        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;
+
+        init_waitqueue_head(&data->slaveirq_wait);
+
+        res = request_irq(data->irq, slaveirq_handler,
+                        IRQF_TRIGGER_RISING | IRQF_SHARED,
+                          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;
+        }
+
+        return res;
+
+out_misc_register:
+        free_irq(data->irq, data);
+out_request_irq:
+        kfree(pdata->irq_data);
+        pdata->irq_data = NULL;
+
+        return res;
+}
+EXPORT_SYMBOL(slaveirq_init);
+
+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;
+}
+EXPORT_SYMBOL(slaveirq_exit);