projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| c558e39e AS |
2 | /* |
| 3 | * Intel Low Power Subsystem PWM controller driver | |
| 4 | * | |
| 5 | * Copyright (C) 2014, Intel Corporation | |
| 6 | * | |
| 7 | * Derived from the original pwm-lpss.c | |
| c558e39e AS |
8 | */ |
| 9 | ||
| c558e39e | 10 | #include <linux/kernel.h> |
| 7f8dd161 | 11 | #include <linux/mod_devicetable.h> |
| c558e39e AS |
12 | #include <linux/module.h> |
| 13 | #include <linux/platform_device.h> | |
| f080be27 | 14 | #include <linux/pm_runtime.h> |
| 7f8dd161 | 15 | #include <linux/property.h> |
| c558e39e AS |
16 | |
| 17 | #include "pwm-lpss.h" | |
| 18 | ||
| 9900073c | 19 | |
| c558e39e AS |
20 | static int pwm_lpss_probe_platform(struct platform_device *pdev) |
| 21 | { | |
| 22 | const struct pwm_lpss_boardinfo *info; | |
| c558e39e | 23 | struct pwm_lpss_chip *lpwm; |
| 68af6fb0 | 24 | void __iomem *base; |
| c558e39e | 25 | |
| 7f8dd161 AS |
26 | info = device_get_match_data(&pdev->dev); |
| 27 | if (!info) | |
| c558e39e AS |
28 | return -ENODEV; |
| 29 | ||
| 68af6fb0 AS |
30 | base = devm_platform_ioremap_resource(pdev, 0); |
| 31 | if (IS_ERR(base)) | |
| 32 | return PTR_ERR(base); | |
| 33 | ||
| f0f31de3 | 34 | lpwm = devm_pwm_lpss_probe(&pdev->dev, base, info); |
| c558e39e AS |
35 | if (IS_ERR(lpwm)) |
| 36 | return PTR_ERR(lpwm); | |
| 37 | ||
| 38 | platform_set_drvdata(pdev, lpwm); | |
| f080be27 | 39 | |
| b9c90f15 HG |
40 | /* |
| 41 | * On Cherry Trail devices the GFX0._PS0 AML checks if the controller | |
| 42 | * is on and if it is not on it turns it on and restores what it | |
| 43 | * believes is the correct state to the PWM controller. | |
| 44 | * Because of this we must disallow direct-complete, which keeps the | |
| 45 | * controller (runtime)suspended on resume, to avoid 2 issues: | |
| 46 | * 1. The controller getting turned on without the linux-pm code | |
| 47 | * knowing about this. On devices where the controller is unused | |
| 48 | * this causes it to stay on during the next suspend causing high | |
| 49 | * battery drain (because S0i3 is not reached) | |
| 50 | * 2. The state restoring code unexpectedly messing with the controller | |
| e3aa45f2 HG |
51 | * |
| 52 | * Leaving the controller runtime-suspended (skipping runtime-resume + | |
| 53 | * normal-suspend) during suspend is fine. | |
| b9c90f15 HG |
54 | */ |
| 55 | if (info->other_devices_aml_touches_pwm_regs) | |
| e3aa45f2 HG |
56 | dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE| |
| 57 | DPM_FLAG_SMART_SUSPEND); | |
| b9c90f15 | 58 | |
| f080be27 QZ |
59 | pm_runtime_set_active(&pdev->dev); |
| 60 | pm_runtime_enable(&pdev->dev); | |
| 61 | ||
| c558e39e AS |
62 | return 0; |
| 63 | } | |
| 64 | ||
| 65 | static int pwm_lpss_remove_platform(struct platform_device *pdev) | |
| 66 | { | |
| f080be27 | 67 | pm_runtime_disable(&pdev->dev); |
| d1e487b7 | 68 | return 0; |
| c558e39e AS |
69 | } |
| 70 | ||
| 71 | static const struct acpi_device_id pwm_lpss_acpi_match[] = { | |
| 72 | { "80860F09", (unsigned long)&pwm_lpss_byt_info }, | |
| 73 | { "80862288", (unsigned long)&pwm_lpss_bsw_info }, | |
| 1688c871 | 74 | { "80862289", (unsigned long)&pwm_lpss_bsw_info }, |
| 03f00e53 | 75 | { "80865AC8", (unsigned long)&pwm_lpss_bxt_info }, |
| c558e39e AS |
76 | { }, |
| 77 | }; | |
| 78 | MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match); | |
| 79 | ||
| 80 | static struct platform_driver pwm_lpss_driver_platform = { | |
| 81 | .driver = { | |
| 82 | .name = "pwm-lpss", | |
| 83 | .acpi_match_table = pwm_lpss_acpi_match, | |
| 84 | }, | |
| 85 | .probe = pwm_lpss_probe_platform, | |
| 86 | .remove = pwm_lpss_remove_platform, | |
| 87 | }; | |
| 88 | module_platform_driver(pwm_lpss_driver_platform); | |
| 89 | ||
| 90 | MODULE_DESCRIPTION("PWM platform driver for Intel LPSS"); | |
| 91 | MODULE_LICENSE("GPL v2"); | |
| a3682d2f | 92 | MODULE_IMPORT_NS(PWM_LPSS); |
| c558e39e | 93 | MODULE_ALIAS("platform:pwm-lpss"); |