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path: root/drivers/hid/intel-ish-hid/ipc/pci-ish.c
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Diffstat (limited to 'drivers/hid/intel-ish-hid/ipc/pci-ish.c')
-rw-r--r--drivers/hid/intel-ish-hid/ipc/pci-ish.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ipc/pci-ish.c b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
new file mode 100644
index 000000000000..42f0beeb09fd
--- /dev/null
+++ b/drivers/hid/intel-ish-hid/ipc/pci-ish.c
@@ -0,0 +1,322 @@
+/*
+ * PCI glue for ISHTP provider device (ISH) driver
+ *
+ * Copyright (c) 2014-2016, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/miscdevice.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/intel_ish.h>
+#include "ishtp-dev.h"
+#include "hw-ish.h"
+
+static const struct pci_device_id ish_pci_tbl[] = {
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, CHV_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, BXT_Bx_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, APL_Ax_DEVICE_ID)},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, SPT_Ax_DEVICE_ID)},
+ {0, }
+};
+MODULE_DEVICE_TABLE(pci, ish_pci_tbl);
+
+/**
+ * ish_event_tracer() - Callback function to dump trace messages
+ * @dev: ishtp device
+ * @format: printf style format
+ *
+ * Callback to direct log messages to Linux trace buffers
+ */
+static void ish_event_tracer(struct ishtp_device *dev, char *format, ...)
+{
+ if (trace_ishtp_dump_enabled()) {
+ va_list args;
+ char tmp_buf[100];
+
+ va_start(args, format);
+ vsnprintf(tmp_buf, sizeof(tmp_buf), format, args);
+ va_end(args);
+
+ trace_ishtp_dump(tmp_buf);
+ }
+}
+
+/**
+ * ish_init() - Init function
+ * @dev: ishtp device
+ *
+ * This function initialize wait queues for suspend/resume and call
+ * calls hadware initialization function. This will initiate
+ * startup sequence
+ *
+ * Return: 0 for success or error code for failure
+ */
+static int ish_init(struct ishtp_device *dev)
+{
+ int ret;
+
+ /* Set the state of ISH HW to start */
+ ret = ish_hw_start(dev);
+ if (ret) {
+ dev_err(dev->devc, "ISH: hw start failed.\n");
+ return ret;
+ }
+
+ /* Start the inter process communication to ISH processor */
+ ret = ishtp_start(dev);
+ if (ret) {
+ dev_err(dev->devc, "ISHTP: Protocol init failed.\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * ish_probe() - PCI driver probe callback
+ * @pdev: pci device
+ * @ent: pci device id
+ *
+ * Initialize PCI function, setup interrupt and call for ISH initialization
+ *
+ * Return: 0 for success or error code for failure
+ */
+static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ struct ishtp_device *dev;
+ struct ish_hw *hw;
+ int ret;
+
+ /* enable pci dev */
+ ret = pci_enable_device(pdev);
+ if (ret) {
+ dev_err(&pdev->dev, "ISH: Failed to enable PCI device\n");
+ return ret;
+ }
+
+ /* set PCI host mastering */
+ pci_set_master(pdev);
+
+ /* pci request regions for ISH driver */
+ ret = pci_request_regions(pdev, KBUILD_MODNAME);
+ if (ret) {
+ dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
+ goto disable_device;
+ }
+
+ /* allocates and initializes the ISH dev structure */
+ dev = ish_dev_init(pdev);
+ if (!dev) {
+ ret = -ENOMEM;
+ goto release_regions;
+ }
+ hw = to_ish_hw(dev);
+ dev->print_log = ish_event_tracer;
+
+ /* mapping IO device memory */
+ hw->mem_addr = pci_iomap(pdev, 0, 0);
+ if (!hw->mem_addr) {
+ dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
+ ret = -ENOMEM;
+ goto free_device;
+ }
+
+ dev->pdev = pdev;
+
+ pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
+
+ /* request and enable interrupt */
+ ret = request_irq(pdev->irq, ish_irq_handler, IRQF_NO_SUSPEND,
+ KBUILD_MODNAME, dev);
+ if (ret) {
+ dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
+ pdev->irq);
+ goto free_device;
+ }
+
+ dev_set_drvdata(dev->devc, dev);
+
+ init_waitqueue_head(&dev->suspend_wait);
+ init_waitqueue_head(&dev->resume_wait);
+
+ ret = ish_init(dev);
+ if (ret)
+ goto free_irq;
+
+ return 0;
+
+free_irq:
+ free_irq(pdev->irq, dev);
+free_device:
+ pci_iounmap(pdev, hw->mem_addr);
+ kfree(dev);
+release_regions:
+ pci_release_regions(pdev);
+disable_device:
+ pci_clear_master(pdev);
+ pci_disable_device(pdev);
+ dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");
+
+ return ret;
+}
+
+/**
+ * ish_remove() - PCI driver remove callback
+ * @pdev: pci device
+ *
+ * This function does cleanup of ISH on pci remove callback
+ */
+static void ish_remove(struct pci_dev *pdev)
+{
+ struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
+ struct ish_hw *hw = to_ish_hw(ishtp_dev);
+
+ ishtp_bus_remove_all_clients(ishtp_dev, false);
+ ish_device_disable(ishtp_dev);
+
+ free_irq(pdev->irq, ishtp_dev);
+ pci_iounmap(pdev, hw->mem_addr);
+ pci_release_regions(pdev);
+ pci_clear_master(pdev);
+ pci_disable_device(pdev);
+ kfree(ishtp_dev);
+}
+
+static struct device *ish_resume_device;
+
+/**
+ * ish_resume_handler() - Work function to complete resume
+ * @work: work struct
+ *
+ * The resume work function to complete resume function asynchronously.
+ * There are two types of platforms, one where ISH is not powered off,
+ * in that case a simple resume message is enough, others we need
+ * a reset sequence.
+ */
+static void ish_resume_handler(struct work_struct *work)
+{
+ struct pci_dev *pdev = to_pci_dev(ish_resume_device);
+ struct ishtp_device *dev = pci_get_drvdata(pdev);
+ int ret;
+
+ ishtp_send_resume(dev);
+
+ /* 50 ms to get resume response */
+ if (dev->resume_flag)
+ ret = wait_event_interruptible_timeout(dev->resume_wait,
+ !dev->resume_flag,
+ msecs_to_jiffies(50));
+
+ /*
+ * If no resume response. This platform is not S0ix compatible
+ * So on resume full reboot of ISH processor will happen, so
+ * need to go through init sequence again
+ */
+ if (dev->resume_flag)
+ ish_init(dev);
+}
+
+/**
+ * ish_suspend() - ISH suspend callback
+ * @device: device pointer
+ *
+ * ISH suspend callback
+ *
+ * Return: 0 to the pm core
+ */
+static int ish_suspend(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct ishtp_device *dev = pci_get_drvdata(pdev);
+
+ enable_irq_wake(pdev->irq);
+ /*
+ * If previous suspend hasn't been asnwered then ISH is likely dead,
+ * don't attempt nested notification
+ */
+ if (dev->suspend_flag)
+ return 0;
+
+ dev->resume_flag = 0;
+ dev->suspend_flag = 1;
+ ishtp_send_suspend(dev);
+
+ /* 25 ms should be enough for live ISH to flush all IPC buf */
+ if (dev->suspend_flag)
+ wait_event_interruptible_timeout(dev->suspend_wait,
+ !dev->suspend_flag,
+ msecs_to_jiffies(25));
+
+ return 0;
+}
+
+static DECLARE_WORK(resume_work, ish_resume_handler);
+/**
+ * ish_resume() - ISH resume callback
+ * @device: device pointer
+ *
+ * ISH resume callback
+ *
+ * Return: 0 to the pm core
+ */
+static int ish_resume(struct device *device)
+{
+ struct pci_dev *pdev = to_pci_dev(device);
+ struct ishtp_device *dev = pci_get_drvdata(pdev);
+
+ ish_resume_device = device;
+ dev->resume_flag = 1;
+
+ disable_irq_wake(pdev->irq);
+ schedule_work(&resume_work);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static const struct dev_pm_ops ish_pm_ops = {
+ .suspend = ish_suspend,
+ .resume = ish_resume,
+};
+#define ISHTP_ISH_PM_OPS (&ish_pm_ops)
+#else
+#define ISHTP_ISH_PM_OPS NULL
+#endif
+
+static struct pci_driver ish_driver = {
+ .name = KBUILD_MODNAME,
+ .id_table = ish_pci_tbl,
+ .probe = ish_probe,
+ .remove = ish_remove,
+ .driver.pm = ISHTP_ISH_PM_OPS,
+};
+
+module_pci_driver(ish_driver);
+
+/* Original author */
+MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
+/* Adoption to upstream Linux kernel */
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
+
+MODULE_DESCRIPTION("Intel(R) Integrated Sensor Hub PCI Device Driver");
+MODULE_LICENSE("GPL");