1 files changed, 297 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/tegra_usb_modem_power.c b/arch/arm/mach-tegra/tegra_usb_modem_power.c
new file mode 100644
index 00000000000..db062ffac34
--- /dev/null
+++ b/arch/arm/mach-tegra/tegra_usb_modem_power.c
@@ -0,0 +1,297 @@
+/*
+ * arch/arm/mach-tegra/tegra_usb_modem_power.c
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/gpio.h>
+#include <linux/usb.h>
+#include <linux/err.h>
+#include <linux/wakelock.h>
+#include <mach/tegra_usb_modem_power.h>
+
+struct tegra_usb_modem {
+        unsigned int wake_gpio; /* remote wakeup gpio */
+        unsigned int wake_cnt;  /* remote wakeup counter */
+        int irq;                /* remote wakeup irq */
+        struct mutex lock;
+        struct wake_lock wake_lock;     /* modem wake lock */
+        unsigned int vid;       /* modem vendor id */
+        unsigned int pid;       /* modem product id */
+        struct usb_device *udev;        /* modem usb device */
+        struct usb_interface *intf;     /* first modem usb interface */
+        struct workqueue_struct *wq;    /* modem workqueue */
+        struct delayed_work recovery_work;      /* modem recovery work */
+        const struct tegra_modem_operations *ops;       /* modem operations */
+        unsigned int capability;        /* modem capability */
+};
+
+static struct tegra_usb_modem tegra_mdm;
+
+/* supported modems */
+static const struct usb_device_id modem_list[] = {
+        {USB_DEVICE(0x1983, 0x0310),    /* Icera 450 rev1 */
+         .driver_info = TEGRA_MODEM_AUTOSUSPEND,
+         },
+        {USB_DEVICE(0x1983, 0x0321),    /* Icera 450 rev2 */
+         .driver_info = TEGRA_MODEM_AUTOSUSPEND,
+         },
+        {}
+};
+
+static irqreturn_t tegra_usb_modem_wake_thread(int irq, void *data)
+{
+        struct tegra_usb_modem *modem = (struct tegra_usb_modem *)data;
+
+        wake_lock_timeout(&modem->wake_lock, HZ);
+        mutex_lock(&modem->lock);
+        if (modem->udev) {
+                usb_lock_device(modem->udev);
+                pr_info("modem wake (%u)\n", ++(modem->wake_cnt));
+                if (usb_autopm_get_interface(modem->intf) == 0)
+                        usb_autopm_put_interface_async(modem->intf);
+                usb_unlock_device(modem->udev);
+        }
+        mutex_unlock(&modem->lock);
+
+        return IRQ_HANDLED;
+}
+
+static void tegra_usb_modem_recovery(struct work_struct *ws)
+{
+        struct tegra_usb_modem *modem = container_of(ws, struct tegra_usb_modem,
+                                                     recovery_work.work);
+
+        mutex_lock(&modem->lock);
+        if (!modem->udev) {     /* assume modem crashed */
+                if (modem->ops && modem->ops->reset)
+                        modem->ops->reset();
+        }
+        mutex_unlock(&modem->lock);
+}
+
+static void device_add_handler(struct usb_device *udev)
+{
+        const struct usb_device_descriptor *desc = &udev->descriptor;
+        struct usb_interface *intf = usb_ifnum_to_if(udev, 0);
+        const struct usb_device_id *id = usb_match_id(intf, modem_list);
+
+        if (id) {
+                /* hold wakelock to ensure ril has enough time to restart */
+                wake_lock_timeout(&tegra_mdm.wake_lock, HZ*10);
+
+                pr_info("Add device %d <%s %s>\n", udev->devnum,
+                        udev->manufacturer, udev->product);
+
+                mutex_lock(&tegra_mdm.lock);
+                tegra_mdm.udev = udev;
+                tegra_mdm.intf = intf;
+                tegra_mdm.vid = desc->idVendor;
+                tegra_mdm.pid = desc->idProduct;
+                tegra_mdm.wake_cnt = 0;
+                tegra_mdm.capability = id->driver_info;
+                mutex_unlock(&tegra_mdm.lock);
+
+                pr_info("persist_enabled: %u\n", udev->persist_enabled);
+
+                if (tegra_mdm.capability & TEGRA_MODEM_AUTOSUSPEND) {
+                        usb_enable_autosuspend(udev);
+                        pr_info("enable autosuspend for %s %s\n",
+                                udev->manufacturer, udev->product);
+                }
+        }
+}
+
+static void device_remove_handler(struct usb_device *udev)
+{
+        const struct usb_device_descriptor *desc = &udev->descriptor;
+
+        if (desc->idVendor == tegra_mdm.vid &&
+            desc->idProduct == tegra_mdm.pid) {
+                pr_info("Remove device %d <%s %s>\n", udev->devnum,
+                        udev->manufacturer, udev->product);
+
+                mutex_lock(&tegra_mdm.lock);
+                tegra_mdm.udev = NULL;
+                tegra_mdm.intf = NULL;
+                tegra_mdm.vid = 0;
+                mutex_unlock(&tegra_mdm.lock);
+
+                if (tegra_mdm.capability & TEGRA_MODEM_RECOVERY)
+                        queue_delayed_work(tegra_mdm.wq,
+                                           &tegra_mdm.recovery_work, HZ * 10);
+        }
+}
+
+static int usb_notify(struct notifier_block *self, unsigned long action,
+                      void *blob)
+{
+        switch (action) {
+        case USB_DEVICE_ADD:
+                device_add_handler(blob);
+                break;
+        case USB_DEVICE_REMOVE:
+                device_remove_handler(blob);
+                break;
+        }
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block usb_nb = {
+        .notifier_call = usb_notify,
+};
+
+static int tegra_usb_modem_probe(struct platform_device *pdev)
+{
+        struct tegra_usb_modem_power_platform_data *pdata =
+            pdev->dev.platform_data;
+        int ret;
+
+        if (!pdata) {
+                dev_dbg(&pdev->dev, "platform_data not available\n");
+                return -EINVAL;
+        }
+
+        /* get modem operations from platform data */
+        tegra_mdm.ops = (const struct tegra_modem_operations *)pdata->ops;
+
+        if (tegra_mdm.ops) {
+                /* modem init */
+                if (tegra_mdm.ops->init) {
+                        ret = tegra_mdm.ops->init();
+                        if (ret)
+                                return ret;
+                }
+
+                /* start modem */
+                if (tegra_mdm.ops->start)
+                        tegra_mdm.ops->start();
+        }
+
+        mutex_init(&(tegra_mdm.lock));
+        wake_lock_init(&(tegra_mdm.wake_lock), WAKE_LOCK_SUSPEND,
+                       "tegra_usb_mdm_lock");
+
+        /* create work queue */
+        tegra_mdm.wq = create_workqueue("tegra_usb_mdm_queue");
+        INIT_DELAYED_WORK(&(tegra_mdm.recovery_work), tegra_usb_modem_recovery);
+
+        /* create threaded irq for remote wakeup */
+        if (gpio_is_valid(pdata->wake_gpio)) {
+                /* get remote wakeup gpio from platform data */
+                tegra_mdm.wake_gpio = pdata->wake_gpio;
+
+                ret = gpio_request(tegra_mdm.wake_gpio, "usb_mdm_wake");
+                if (ret)
+                        return ret;
+
+                tegra_gpio_enable(tegra_mdm.wake_gpio);
+
+                /* enable IRQ for remote wakeup */
+                tegra_mdm.irq = gpio_to_irq(tegra_mdm.wake_gpio);
+
+                ret =
+                    request_threaded_irq(tegra_mdm.irq, NULL,
+                                         tegra_usb_modem_wake_thread,
+                                         pdata->flags, "tegra_usb_mdm_wake",
+                                         &tegra_mdm);
+                if (ret < 0) {
+                        dev_err(&pdev->dev, "%s: request_threaded_irq error\n",
+                                __func__);
+                        return ret;
+                }
+
+                ret = enable_irq_wake(tegra_mdm.irq);
+                if (ret) {
+                        dev_err(&pdev->dev, "%s: enable_irq_wake error\n",
+                                __func__);
+                        free_irq(tegra_mdm.irq, &tegra_mdm);
+                        return ret;
+                }
+        }
+
+        usb_register_notify(&usb_nb);
+        dev_info(&pdev->dev, "Initialized tegra_usb_modem_power\n");
+
+        return 0;
+}
+
+static int __exit tegra_usb_modem_remove(struct platform_device *pdev)
+{
+        usb_unregister_notify(&usb_nb);
+
+        if (tegra_mdm.irq) {
+                disable_irq_wake(tegra_mdm.irq);
+                free_irq(tegra_mdm.irq, &tegra_mdm);
+        }
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int tegra_usb_modem_suspend(struct platform_device *pdev,
+                                   pm_message_t state)
+{
+        /* send L3 hint to modem */
+        if (tegra_mdm.ops && tegra_mdm.ops->suspend)
+                tegra_mdm.ops->suspend();
+        return 0;
+}
+
+static int tegra_usb_modem_resume(struct platform_device *pdev)
+{
+        /* send L3->L0 hint to modem */
+        if (tegra_mdm.ops && tegra_mdm.ops->resume)
+                tegra_mdm.ops->resume();
+        return 0;
+}
+#endif
+
+static struct platform_driver tegra_usb_modem_power_driver = {
+        .driver = {
+                   .name = "tegra_usb_modem_power",
+                   .owner = THIS_MODULE,
+                   },
+        .probe = tegra_usb_modem_probe,
+        .remove = __exit_p(tegra_usb_modem_remove),
+#ifdef CONFIG_PM
+        .suspend = tegra_usb_modem_suspend,
+        .resume = tegra_usb_modem_resume,
+#endif
+};
+
+static int __init tegra_usb_modem_power_init(void)
+{
+        return platform_driver_register(&tegra_usb_modem_power_driver);
+}
+
+subsys_initcall(tegra_usb_modem_power_init);
+
+static void __exit tegra_usb_modem_power_exit(void)
+{
+        platform_driver_unregister(&tegra_usb_modem_power_driver);
+}
+
+module_exit(tegra_usb_modem_power_exit);
+
+MODULE_DESCRIPTION("Tegra usb modem power management driver");
+MODULE_LICENSE("GPL");