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 }; 34 35 /* Broxton */ 36 static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { 37 .clk_rate = 19200000, 38 .npwm = 4, 39 .base_unit_bits = 22, 40 }; 41 42 static int pwm_lpss_probe_platform(struct platform_device *pdev) 43 { 44 const struct pwm_lpss_boardinfo *info; 45 const struct acpi_device_id *id; 46 struct pwm_lpss_chip *lpwm; 47 struct resource *r; 48 49 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); 50 if (!id) 51 return -ENODEV; 52 53 info = (const struct pwm_lpss_boardinfo *)id->driver_data; 54 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 55 56 lpwm = pwm_lpss_probe(&pdev->dev, r, info); 57 if (IS_ERR(lpwm)) 58 return PTR_ERR(lpwm); 59 60 platform_set_drvdata(pdev, lpwm); 61 62 pm_runtime_set_active(&pdev->dev); 63 pm_runtime_enable(&pdev->dev); 64 65 return 0; 66 } 67 68 static int pwm_lpss_remove_platform(struct platform_device *pdev) 69 { 70 struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev); 71 72 pm_runtime_disable(&pdev->dev); 73 return pwm_lpss_remove(lpwm); 74 } 75 76 static const struct acpi_device_id pwm_lpss_acpi_match[] = { 77 { "80860F09", (unsigned long)&pwm_lpss_byt_info }, 78 { "80862288", (unsigned long)&pwm_lpss_bsw_info }, 79 { "80865AC8", (unsigned long)&pwm_lpss_bxt_info }, 80 { }, 81 }; 82 MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match); 83 84 static struct platform_driver pwm_lpss_driver_platform = { 85 .driver = { 86 .name = "pwm-lpss", 87 .acpi_match_table = pwm_lpss_acpi_match, 88 }, 89 .probe = pwm_lpss_probe_platform, 90 .remove = pwm_lpss_remove_platform, 91 }; 92 module_platform_driver(pwm_lpss_driver_platform); 93 94 MODULE_DESCRIPTION("PWM platform driver for Intel LPSS"); 95 MODULE_LICENSE("GPL v2"); 96 MODULE_ALIAS("platform:pwm-lpss"); 97