kernel/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
  20 static 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
  44 static 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
  55 static 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
  64 static int pwm_lpss_runtime_resume_pci(struct device *dev)
  65 {
  66         return 0;
  67 }
  68 #endif
  69
  70 static 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
  75 static 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 };
  85 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
  86
  87 static 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 };
  96 module_pci_driver(pwm_lpss_driver_pci);
  97
  98 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
  99 MODULE_LICENSE("GPL v2");