133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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* Intel Baytrail PWM ACPI driver.
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*
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* Copyright (C) 2013 Intel corporation.
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*
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* ----------------------------------------------------------------------------
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* ----------------------------------------------------------------------------
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/pm_runtime.h>
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#include <linux/pwm.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include "pwm_byt_core.h"
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id pwm_byt_acpi_ids[] = {
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{ "80860F09", 0 },
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{ "80862288", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, pwm_byt_acpi_ids);
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#endif
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static int pwm_byt_plat_probe(struct platform_device *pdev)
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{
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static int pwm_num;
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struct resource *mem, *ioarea;
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void __iomem *base;
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int r;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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dev_err(&pdev->dev, "no mem resource?\n");
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return -EINVAL;
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}
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ioarea = request_mem_region(mem->start, resource_size(mem),
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pdev->name);
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if (!ioarea) {
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dev_err(&pdev->dev, "pwm region already claimed\n");
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return -EBUSY;
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}
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base = ioremap_nocache(mem->start, resource_size(mem));
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if (!base) {
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dev_err(&pdev->dev, "I/O memory remapping failed\n");
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r = -ENOMEM;
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goto err_release_region;
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}
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r = pwm_byt_init(&pdev->dev, base, pwm_num, PWM_BYT_CLK_KHZ);
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if (r)
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goto err_iounmap;
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pm_runtime_set_autosuspend_delay(&pdev->dev, 5);
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pm_runtime_use_autosuspend(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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pm_runtime_allow(&pdev->dev);
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++pwm_num;
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return 0;
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err_iounmap:
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iounmap(base);
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err_release_region:
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release_mem_region(mem->start, resource_size(mem));
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dev_info(&pdev->dev, "PWM device probe failed!\n");
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return r;
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}
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static void pwm_byt_plat_remove(struct platform_device *pdev)
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{
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struct resource *mem;
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pm_runtime_forbid(&pdev->dev);
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pwm_byt_remove(&pdev->dev);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (mem) {
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release_mem_region(mem->start, resource_size(mem));
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}
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}
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static struct platform_driver pwm_byt_plat_driver = {
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.remove = pwm_byt_plat_remove,
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.driver = {
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.name = "pwm-byt-plat",
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.owner = THIS_MODULE,
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.pm = &pwm_byt_pm,
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#ifdef CONFIG_ACPI
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.acpi_match_table = ACPI_PTR(pwm_byt_acpi_ids),
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#endif
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},
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};
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static int __init pwm_byt_init_driver(void)
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{
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return platform_driver_probe(&pwm_byt_plat_driver, pwm_byt_plat_probe);
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}
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module_init(pwm_byt_init_driver);
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static void __exit pwm_byt_exit_driver(void)
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{
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platform_driver_unregister(&pwm_byt_plat_driver);
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}
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module_exit(pwm_byt_exit_driver);
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MODULE_ALIAS("pwm-byt-plat");
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MODULE_AUTHOR("Wang, Zhifeng<zhifeng.wang@intel.com>");
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MODULE_DESCRIPTION("Intel Baytrail PWM driver");
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MODULE_LICENSE("GPL");
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