GNU Linux-libre 4.9.328-gnu1
[releases.git] / 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, 0x11a5), (unsigned long)&pwm_lpss_bxt_info},
80         { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info},
81         { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info},
82         { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info},
83         { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info},
84         { },
85 };
86 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
87
88 static struct pci_driver pwm_lpss_driver_pci = {
89         .name = "pwm-lpss",
90         .id_table = pwm_lpss_pci_ids,
91         .probe = pwm_lpss_probe_pci,
92         .remove = pwm_lpss_remove_pci,
93         .driver = {
94                 .pm = &pwm_lpss_pci_pm,
95         },
96 };
97 module_pci_driver(pwm_lpss_driver_pci);
98
99 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
100 MODULE_LICENSE("GPL v2");