tjh.dev
Linux kernel mirror (for testing)
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kernel
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linux
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
17static 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 = devm_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
45static 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
51static 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
60static int pwm_lpss_runtime_resume_pci(struct device *dev)
61{
62 return 0;
63}
64
65static DEFINE_RUNTIME_DEV_PM_OPS(pwm_lpss_pci_pm,
66 pwm_lpss_runtime_suspend_pci,
67 pwm_lpss_runtime_resume_pci,
68 NULL);
69
70static 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};
82MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
83
84static 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};
93module_pci_driver(pwm_lpss_driver_pci);
94
95MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
96MODULE_LICENSE("GPL v2");
97MODULE_IMPORT_NS(PWM_LPSS);