1 /* 2 * Intel Low Power Subsystem PWM controller 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/acpi.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/pm_runtime.h> 18 19 #include "pwm-lpss.h" 20 21 /* BayTrail */ 22 static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = { 23 .clk_rate = 25000000, 24 .npwm = 1, 25 .base_unit_bits = 16, 26 }; 27 28 /* Braswell */ 29 static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = { 30 .clk_rate = 19200000, 31 .npwm = 1, 32 .base_unit_bits = 16, 33 .check_power_on_resume = true, 34 }; 35 36 /* Broxton */ 37 static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { 38 .clk_rate = 19200000, 39 .npwm = 4, 40 .base_unit_bits = 22, 41 .bypass = true, 42 }; 43 44 static int pwm_lpss_probe_platform(struct platform_device *pdev) 45 { 46 const struct pwm_lpss_boardinfo *info; 47 const struct acpi_device_id *id; 48 struct pwm_lpss_chip *lpwm; 49 struct resource *r; 50 51 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); 52 if (!id) 53 return -ENODEV; 54 55 info = (const struct pwm_lpss_boardinfo *)id->driver_data; 56 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 57 58 lpwm = pwm_lpss_probe(&pdev->dev, r, info); 59 if (IS_ERR(lpwm)) 60 return PTR_ERR(lpwm); 61 62 platform_set_drvdata(pdev, lpwm); 63 64 pm_runtime_set_active(&pdev->dev); 65 pm_runtime_enable(&pdev->dev); 66 67 return 0; 68 } 69 70 static int pwm_lpss_remove_platform(struct platform_device *pdev) 71 { 72 struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev); 73 74 pm_runtime_disable(&pdev->dev); 75 return pwm_lpss_remove(lpwm); 76 } 77 78 static void pwm_lpss_complete(struct device *dev) 79 { 80 struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev); 81 int ret, state; 82 83 /* The PWM may be turned on by AML code, update our state to match */ 84 if (pm_runtime_suspended(dev) && lpwm->info->check_power_on_resume) { 85 pm_runtime_disable(dev); 86 87 ret = acpi_device_get_power(ACPI_COMPANION(dev), &state); 88 if (ret == 0 && state == ACPI_STATE_D0) 89 pm_runtime_set_active(dev); 90 91 pm_runtime_enable(dev); 92 } 93 } 94 95 static const struct dev_pm_ops pwm_lpss_platform_pm_ops = { 96 .complete = pwm_lpss_complete, 97 SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume) 98 }; 99 100 static const struct acpi_device_id pwm_lpss_acpi_match[] = { 101 { "80860F09", (unsigned long)&pwm_lpss_byt_info }, 102 { "80862288", (unsigned long)&pwm_lpss_bsw_info }, 103 { "80862289", (unsigned long)&pwm_lpss_bsw_info }, 104 { "80865AC8", (unsigned long)&pwm_lpss_bxt_info }, 105 { }, 106 }; 107 MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match); 108 109 static struct platform_driver pwm_lpss_driver_platform = { 110 .driver = { 111 .name = "pwm-lpss", 112 .acpi_match_table = pwm_lpss_acpi_match, 113 .pm = &pwm_lpss_platform_pm_ops, 114 }, 115 .probe = pwm_lpss_probe_platform, 116 .remove = pwm_lpss_remove_platform, 117 }; 118 module_platform_driver(pwm_lpss_driver_platform); 119 120 MODULE_DESCRIPTION("PWM platform driver for Intel LPSS"); 121 MODULE_LICENSE("GPL v2"); 122 MODULE_ALIAS("platform:pwm-lpss"); 123