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_chip *chip; 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 chip = devm_pwm_lpss_probe(&pdev->dev, pcim_iomap_table(pdev)[0], info); 34 if (IS_ERR(chip)) 35 return PTR_ERR(chip); 36 37 pm_runtime_put(&pdev->dev); 38 pm_runtime_allow(&pdev->dev); 39 40 return 0; 41 } 42 43 static void pwm_lpss_remove_pci(struct pci_dev *pdev) 44 { 45 pm_runtime_forbid(&pdev->dev); 46 pm_runtime_get_sync(&pdev->dev); 47 } 48 49 static int pwm_lpss_runtime_suspend_pci(struct device *dev) 50 { 51 /* 52 * The PCI core will handle transition to D3 automatically. We only 53 * need to provide runtime PM hooks for that to happen. 54 */ 55 return 0; 56 } 57 58 static int pwm_lpss_runtime_resume_pci(struct device *dev) 59 { 60 return 0; 61 } 62 63 static DEFINE_RUNTIME_DEV_PM_OPS(pwm_lpss_pci_pm, 64 pwm_lpss_runtime_suspend_pci, 65 pwm_lpss_runtime_resume_pci, 66 NULL); 67 68 static const struct pci_device_id pwm_lpss_pci_ids[] = { 69 { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info}, 70 { PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info}, 71 { PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info}, 72 { PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_tng_info}, 73 { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info}, 74 { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info}, 75 { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info}, 76 { PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info}, 77 { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info}, 78 { }, 79 }; 80 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids); 81 82 static struct pci_driver pwm_lpss_driver_pci = { 83 .name = "pwm-lpss", 84 .id_table = pwm_lpss_pci_ids, 85 .probe = pwm_lpss_probe_pci, 86 .remove = pwm_lpss_remove_pci, 87 .driver = { 88 .pm = pm_ptr(&pwm_lpss_pci_pm), 89 }, 90 }; 91 module_pci_driver(pwm_lpss_driver_pci); 92 93 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS"); 94 MODULE_LICENSE("GPL v2"); 95 MODULE_IMPORT_NS(PWM_LPSS); 96