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"); 101