drivers/pwm/pwm-lpss-platform.c

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