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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | // SPDX-License-Identifier: GPL-2.0-only /* * Intel Low Power Subsystem PWM controller driver * * Copyright (C) 2014, Intel Corporation * * Derived from the original pwm-lpss.c */ #include <linux/acpi.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include "pwm-lpss.h" /* BayTrail */ static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = { .clk_rate = 25000000, .npwm = 1, .base_unit_bits = 16, }; /* Braswell */ static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = { .clk_rate = 19200000, .npwm = 1, .base_unit_bits = 16, .other_devices_aml_touches_pwm_regs = true, }; /* Broxton */ static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { .clk_rate = 19200000, .npwm = 4, .base_unit_bits = 22, .bypass = true, }; static int pwm_lpss_probe_platform(struct platform_device *pdev) { const struct pwm_lpss_boardinfo *info; const struct acpi_device_id *id; struct pwm_lpss_chip *lpwm; struct resource *r; id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); if (!id) return -ENODEV; info = (const struct pwm_lpss_boardinfo *)id->driver_data; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); lpwm = pwm_lpss_probe(&pdev->dev, r, info); if (IS_ERR(lpwm)) return PTR_ERR(lpwm); platform_set_drvdata(pdev, lpwm); dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE); pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); return 0; } static int pwm_lpss_remove_platform(struct platform_device *pdev) { struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev); pm_runtime_disable(&pdev->dev); return pwm_lpss_remove(lpwm); } static int pwm_lpss_prepare(struct device *dev) { struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev); /* * If other device's AML code touches the PWM regs on suspend/resume * force runtime-resume the PWM controller to allow this. */ if (lpwm->info->other_devices_aml_touches_pwm_regs) return 0; /* Force runtime-resume */ return 1; /* If runtime-suspended leave as is */ } static const struct dev_pm_ops pwm_lpss_platform_pm_ops = { .prepare = pwm_lpss_prepare, SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume) }; static const struct acpi_device_id pwm_lpss_acpi_match[] = { { "80860F09", (unsigned long)&pwm_lpss_byt_info }, { "80862288", (unsigned long)&pwm_lpss_bsw_info }, { "80862289", (unsigned long)&pwm_lpss_bsw_info }, { "80865AC8", (unsigned long)&pwm_lpss_bxt_info }, { }, }; MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match); static struct platform_driver pwm_lpss_driver_platform = { .driver = { .name = "pwm-lpss", .acpi_match_table = pwm_lpss_acpi_match, .pm = &pwm_lpss_platform_pm_ops, }, .probe = pwm_lpss_probe_platform, .remove = pwm_lpss_remove_platform, }; module_platform_driver(pwm_lpss_driver_platform); MODULE_DESCRIPTION("PWM platform driver for Intel LPSS"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:pwm-lpss"); |