c942fddf87
Based on 3 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* pwrseq_sd8787.c - power sequence support for Marvell SD8787 BT + Wifi chip
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*
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* Copyright (C) 2016 Matt Ranostay <matt@ranostay.consulting>
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*
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* Based on the original work pwrseq_simple.c
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* Copyright (C) 2014 Linaro Ltd
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* Author: Ulf Hansson <ulf.hansson@linaro.org>
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mmc/host.h>
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#include "pwrseq.h"
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struct mmc_pwrseq_sd8787 {
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struct mmc_pwrseq pwrseq;
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struct gpio_desc *reset_gpio;
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struct gpio_desc *pwrdn_gpio;
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};
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#define to_pwrseq_sd8787(p) container_of(p, struct mmc_pwrseq_sd8787, pwrseq)
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static void mmc_pwrseq_sd8787_pre_power_on(struct mmc_host *host)
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{
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struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
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gpiod_set_value_cansleep(pwrseq->reset_gpio, 1);
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msleep(300);
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gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 1);
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}
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static void mmc_pwrseq_sd8787_power_off(struct mmc_host *host)
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{
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struct mmc_pwrseq_sd8787 *pwrseq = to_pwrseq_sd8787(host->pwrseq);
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gpiod_set_value_cansleep(pwrseq->pwrdn_gpio, 0);
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gpiod_set_value_cansleep(pwrseq->reset_gpio, 0);
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}
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static const struct mmc_pwrseq_ops mmc_pwrseq_sd8787_ops = {
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.pre_power_on = mmc_pwrseq_sd8787_pre_power_on,
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.power_off = mmc_pwrseq_sd8787_power_off,
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};
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static const struct of_device_id mmc_pwrseq_sd8787_of_match[] = {
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{ .compatible = "mmc-pwrseq-sd8787",},
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{/* sentinel */},
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};
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MODULE_DEVICE_TABLE(of, mmc_pwrseq_sd8787_of_match);
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static int mmc_pwrseq_sd8787_probe(struct platform_device *pdev)
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{
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struct mmc_pwrseq_sd8787 *pwrseq;
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struct device *dev = &pdev->dev;
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pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL);
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if (!pwrseq)
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return -ENOMEM;
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pwrseq->pwrdn_gpio = devm_gpiod_get(dev, "powerdown", GPIOD_OUT_LOW);
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if (IS_ERR(pwrseq->pwrdn_gpio))
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return PTR_ERR(pwrseq->pwrdn_gpio);
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pwrseq->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
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if (IS_ERR(pwrseq->reset_gpio))
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return PTR_ERR(pwrseq->reset_gpio);
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pwrseq->pwrseq.dev = dev;
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pwrseq->pwrseq.ops = &mmc_pwrseq_sd8787_ops;
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pwrseq->pwrseq.owner = THIS_MODULE;
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platform_set_drvdata(pdev, pwrseq);
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return mmc_pwrseq_register(&pwrseq->pwrseq);
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}
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static int mmc_pwrseq_sd8787_remove(struct platform_device *pdev)
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{
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struct mmc_pwrseq_sd8787 *pwrseq = platform_get_drvdata(pdev);
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mmc_pwrseq_unregister(&pwrseq->pwrseq);
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return 0;
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}
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static struct platform_driver mmc_pwrseq_sd8787_driver = {
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.probe = mmc_pwrseq_sd8787_probe,
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.remove = mmc_pwrseq_sd8787_remove,
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.driver = {
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.name = "pwrseq_sd8787",
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.of_match_table = mmc_pwrseq_sd8787_of_match,
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},
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};
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module_platform_driver(mmc_pwrseq_sd8787_driver);
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MODULE_LICENSE("GPL v2");
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