drivers/pwm/pwm-lpss-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel Low Power Subsystem PWM controller PCI driver
   4  *
   5  * Copyright (C) 2014, Intel Corporation
   6  *
   7  * Derived from the original pwm-lpss.c
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/pm_runtime.h>
  14
  15 #include "pwm-lpss.h"
  16
  17 static int pwm_lpss_probe_pci(struct pci_dev *pdev,
  18                               const struct pci_device_id *id)
  19 {
  20         const struct pwm_lpss_boardinfo *info;
  21         struct pwm_lpss_chip *lpwm;
  22         int err;
  23
  24         err = pcim_enable_device(pdev);
  25         if (err < 0)
  26                 return err;
  27
  28         err = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev));
  29         if (err)
  30                 return err;
  31
  32         info = (struct pwm_lpss_boardinfo *)id->driver_data;
  33         lpwm = pwm_lpss_probe(&pdev->dev, pcim_iomap_table(pdev)[0], info);
  34         if (IS_ERR(lpwm))
  35                 return PTR_ERR(lpwm);
  36
  37         pci_set_drvdata(pdev, lpwm);
  38
  39         pm_runtime_put(&pdev->dev);
  40         pm_runtime_allow(&pdev->dev);
  41
  42         return 0;
  43 }
  44
  45 static void pwm_lpss_remove_pci(struct pci_dev *pdev)
  46 {
  47         pm_runtime_forbid(&pdev->dev);
  48         pm_runtime_get_sync(&pdev->dev);
  49 }
  50
  51 static int pwm_lpss_runtime_suspend_pci(struct device *dev)
  52 {
  53         /*
  54          * The PCI core will handle transition to D3 automatically. We only
  55          * need to provide runtime PM hooks for that to happen.
  56          */
  57         return 0;
  58 }
  59
  60 static int pwm_lpss_runtime_resume_pci(struct device *dev)
  61 {
  62         return 0;
  63 }
  64
  65 static DEFINE_RUNTIME_DEV_PM_OPS(pwm_lpss_pci_pm,
  66                                  pwm_lpss_runtime_suspend_pci,
  67                                  pwm_lpss_runtime_resume_pci,
  68                                  NULL);
  69
  70 static const struct pci_device_id pwm_lpss_pci_ids[] = {
  71         { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info},
  72         { PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info},
  73         { PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info},
  74         { PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_tng_info},
  75         { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info},
  76         { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info},
  77         { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info},
  78         { PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info},
  79         { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info},
  80         { },
  81 };
  82 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
  83
  84 static struct pci_driver pwm_lpss_driver_pci = {
  85         .name = "pwm-lpss",
  86         .id_table = pwm_lpss_pci_ids,
  87         .probe = pwm_lpss_probe_pci,
  88         .remove = pwm_lpss_remove_pci,
  89         .driver = {
  90                 .pm = pm_ptr(&pwm_lpss_pci_pm),
  91         },
  92 };
  93 module_pci_driver(pwm_lpss_driver_pci);
  94
  95 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
  96 MODULE_LICENSE("GPL v2");
  97 MODULE_IMPORT_NS(PWM_LPSS);