LXR linux/drivers/pwm/pwm-lpss-pci.c

   1/*
   2 * Intel Low Power Subsystem PWM controller PCI driver
   3 *
   4 * Copyright (C) 2014, Intel Corporation
   5 *
   6 * Derived from the original pwm-lpss.c
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/kernel.h>
  14#include <linux/module.h>
  15#include <linux/pci.h>
  16#include <linux/pm_runtime.h>
  17
  18#include "pwm-lpss.h"
  19
  20static int pwm_lpss_probe_pci(struct pci_dev *pdev,
  21                              const struct pci_device_id *id)
  22{
  23        const struct pwm_lpss_boardinfo *info;
  24        struct pwm_lpss_chip *lpwm;
  25        int err;
  26
  27        err = pcim_enable_device(pdev);
  28        if (err < 0)
  29                return err;
  30
  31        info = (struct pwm_lpss_boardinfo *)id->driver_data;
  32        lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info);
  33        if (IS_ERR(lpwm))
  34                return PTR_ERR(lpwm);
  35
  36        pci_set_drvdata(pdev, lpwm);
  37
  38        pm_runtime_put(&pdev->dev);
  39        pm_runtime_allow(&pdev->dev);
  40
  41        return 0;
  42}
  43
  44static void pwm_lpss_remove_pci(struct pci_dev *pdev)
  45{
  46        struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev);
  47
  48        pm_runtime_forbid(&pdev->dev);
  49        pm_runtime_get_sync(&pdev->dev);
  50
  51        pwm_lpss_remove(lpwm);
  52}
  53
  54#ifdef CONFIG_PM
  55static int pwm_lpss_runtime_suspend_pci(struct device *dev)
  56{
  57        /*
  58         * The PCI core will handle transition to D3 automatically. We only
  59         * need to provide runtime PM hooks for that to happen.
  60         */
  61        return 0;
  62}
  63
  64static int pwm_lpss_runtime_resume_pci(struct device *dev)
  65{
  66        return 0;
  67}
  68#endif
  69
  70static const struct dev_pm_ops pwm_lpss_pci_pm = {
  71        SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci,
  72                           pwm_lpss_runtime_resume_pci, NULL)
  73};
  74
  75static const struct pci_device_id pwm_lpss_pci_ids[] = {
  76        { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info},
  77        { PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info},
  78        { PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info},
  79        { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info},
  80        { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info},
  81        { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info},
  82        { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info},
  83        { },
  84};
  85MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
  86
  87static struct pci_driver pwm_lpss_driver_pci = {
  88        .name = "pwm-lpss",
  89        .id_table = pwm_lpss_pci_ids,
  90        .probe = pwm_lpss_probe_pci,
  91        .remove = pwm_lpss_remove_pci,
  92        .driver = {
  93                .pm = &pwm_lpss_pci_pm,
  94        },
  95};
  96module_pci_driver(pwm_lpss_driver_pci);
  97
  98MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
  99MODULE_LICENSE("GPL v2");
 100