forked from Minki/linux
fb3967b95c
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Jonathan Hunter <jonathanh@nvidia.com> Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* OMAP OTG controller driver
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*
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* Based on code from tahvo-usb.c and isp1301_omap.c drivers.
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*
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* Copyright (C) 2005-2006 Nokia Corporation
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* Copyright (C) 2004 Texas Instruments
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* Copyright (C) 2004 David Brownell
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*/
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/extcon.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/usb-omap1.h>
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struct otg_device {
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void __iomem *base;
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bool id;
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bool vbus;
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struct extcon_dev *extcon;
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struct notifier_block vbus_nb;
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struct notifier_block id_nb;
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};
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#define OMAP_OTG_CTRL 0x0c
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#define OMAP_OTG_ASESSVLD (1 << 20)
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#define OMAP_OTG_BSESSEND (1 << 19)
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#define OMAP_OTG_BSESSVLD (1 << 18)
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#define OMAP_OTG_VBUSVLD (1 << 17)
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#define OMAP_OTG_ID (1 << 16)
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#define OMAP_OTG_XCEIV_OUTPUTS \
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(OMAP_OTG_ASESSVLD | OMAP_OTG_BSESSEND | OMAP_OTG_BSESSVLD | \
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OMAP_OTG_VBUSVLD | OMAP_OTG_ID)
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static void omap_otg_ctrl(struct otg_device *otg_dev, u32 outputs)
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{
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u32 l;
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l = readl(otg_dev->base + OMAP_OTG_CTRL);
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l &= ~OMAP_OTG_XCEIV_OUTPUTS;
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l |= outputs;
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writel(l, otg_dev->base + OMAP_OTG_CTRL);
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}
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static void omap_otg_set_mode(struct otg_device *otg_dev)
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{
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if (!otg_dev->id && otg_dev->vbus)
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/* Set B-session valid. */
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omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSVLD);
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else if (otg_dev->vbus)
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/* Set A-session valid. */
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omap_otg_ctrl(otg_dev, OMAP_OTG_ASESSVLD);
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else if (!otg_dev->id)
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/* Set B-session end to indicate no VBUS. */
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omap_otg_ctrl(otg_dev, OMAP_OTG_ID | OMAP_OTG_BSESSEND);
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}
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static int omap_otg_id_notifier(struct notifier_block *nb,
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unsigned long event, void *ptr)
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{
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struct otg_device *otg_dev = container_of(nb, struct otg_device, id_nb);
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otg_dev->id = event;
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omap_otg_set_mode(otg_dev);
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return NOTIFY_DONE;
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}
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static int omap_otg_vbus_notifier(struct notifier_block *nb,
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unsigned long event, void *ptr)
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{
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struct otg_device *otg_dev = container_of(nb, struct otg_device,
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vbus_nb);
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otg_dev->vbus = event;
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omap_otg_set_mode(otg_dev);
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return NOTIFY_DONE;
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}
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static int omap_otg_probe(struct platform_device *pdev)
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{
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const struct omap_usb_config *config = pdev->dev.platform_data;
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struct otg_device *otg_dev;
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struct extcon_dev *extcon;
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int ret;
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u32 rev;
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if (!config || !config->extcon)
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return -ENODEV;
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extcon = extcon_get_extcon_dev(config->extcon);
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if (!extcon)
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return -EPROBE_DEFER;
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otg_dev = devm_kzalloc(&pdev->dev, sizeof(*otg_dev), GFP_KERNEL);
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if (!otg_dev)
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return -ENOMEM;
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otg_dev->base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
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if (IS_ERR(otg_dev->base))
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return PTR_ERR(otg_dev->base);
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otg_dev->extcon = extcon;
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otg_dev->id_nb.notifier_call = omap_otg_id_notifier;
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otg_dev->vbus_nb.notifier_call = omap_otg_vbus_notifier;
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ret = devm_extcon_register_notifier(&pdev->dev, extcon,
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EXTCON_USB_HOST, &otg_dev->id_nb);
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if (ret)
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return ret;
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ret = devm_extcon_register_notifier(&pdev->dev, extcon,
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EXTCON_USB, &otg_dev->vbus_nb);
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if (ret) {
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return ret;
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}
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otg_dev->id = extcon_get_state(extcon, EXTCON_USB_HOST);
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otg_dev->vbus = extcon_get_state(extcon, EXTCON_USB);
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omap_otg_set_mode(otg_dev);
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rev = readl(otg_dev->base);
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dev_info(&pdev->dev,
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"OMAP USB OTG controller rev %d.%d (%s, id=%d, vbus=%d)\n",
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(rev >> 4) & 0xf, rev & 0xf, config->extcon, otg_dev->id,
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otg_dev->vbus);
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platform_set_drvdata(pdev, otg_dev);
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return 0;
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}
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static struct platform_driver omap_otg_driver = {
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.probe = omap_otg_probe,
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.driver = {
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.name = "omap_otg",
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},
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};
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module_platform_driver(omap_otg_driver);
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MODULE_DESCRIPTION("OMAP USB OTG controller driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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