![Greg Kroah-Hartman](/assets/img/avatar_default.png)
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>
455 lines
11 KiB
C
455 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Tahvo USB transceiver driver
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*
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* Copyright (C) 2005-2006 Nokia Corporation
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*
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* Parts copied from isp1301_omap.c.
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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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* Original driver written by Juha Yrjölä, Tony Lindgren and Timo Teräs.
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* Modified for Retu/Tahvo MFD by Aaro Koskinen.
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*/
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/usb.h>
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#include <linux/extcon-provider.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/usb/otg.h>
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#include <linux/mfd/retu.h>
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#include <linux/usb/gadget.h>
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#include <linux/platform_device.h>
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#define DRIVER_NAME "tahvo-usb"
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#define TAHVO_REG_IDSR 0x02
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#define TAHVO_REG_USBR 0x06
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#define USBR_SLAVE_CONTROL (1 << 8)
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#define USBR_VPPVIO_SW (1 << 7)
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#define USBR_SPEED (1 << 6)
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#define USBR_REGOUT (1 << 5)
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#define USBR_MASTER_SW2 (1 << 4)
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#define USBR_MASTER_SW1 (1 << 3)
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#define USBR_SLAVE_SW (1 << 2)
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#define USBR_NSUSPEND (1 << 1)
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#define USBR_SEMODE (1 << 0)
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#define TAHVO_MODE_HOST 0
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#define TAHVO_MODE_PERIPHERAL 1
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struct tahvo_usb {
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struct platform_device *pt_dev;
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struct usb_phy phy;
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int vbus_state;
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struct mutex serialize;
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struct clk *ick;
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int irq;
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int tahvo_mode;
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struct extcon_dev *extcon;
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};
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static const unsigned int tahvo_cable[] = {
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EXTCON_USB,
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EXTCON_USB_HOST,
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EXTCON_NONE,
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};
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static ssize_t vbus_state_show(struct device *device,
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struct device_attribute *attr, char *buf)
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{
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struct tahvo_usb *tu = dev_get_drvdata(device);
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return sprintf(buf, "%s\n", tu->vbus_state ? "on" : "off");
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}
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static DEVICE_ATTR(vbus, 0444, vbus_state_show, NULL);
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static void check_vbus_state(struct tahvo_usb *tu)
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{
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struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
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int reg, prev_state;
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reg = retu_read(rdev, TAHVO_REG_IDSR);
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if (reg & TAHVO_STAT_VBUS) {
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switch (tu->phy.otg->state) {
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case OTG_STATE_B_IDLE:
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/* Enable the gadget driver */
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if (tu->phy.otg->gadget)
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usb_gadget_vbus_connect(tu->phy.otg->gadget);
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tu->phy.otg->state = OTG_STATE_B_PERIPHERAL;
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usb_phy_set_event(&tu->phy, USB_EVENT_ENUMERATED);
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break;
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case OTG_STATE_A_IDLE:
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/*
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* Session is now valid assuming the USB hub is driving
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* Vbus.
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*/
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tu->phy.otg->state = OTG_STATE_A_HOST;
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break;
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default:
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break;
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}
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dev_info(&tu->pt_dev->dev, "USB cable connected\n");
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} else {
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switch (tu->phy.otg->state) {
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case OTG_STATE_B_PERIPHERAL:
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if (tu->phy.otg->gadget)
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usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
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tu->phy.otg->state = OTG_STATE_B_IDLE;
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usb_phy_set_event(&tu->phy, USB_EVENT_NONE);
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break;
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case OTG_STATE_A_HOST:
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tu->phy.otg->state = OTG_STATE_A_IDLE;
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break;
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default:
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break;
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}
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dev_info(&tu->pt_dev->dev, "USB cable disconnected\n");
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}
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prev_state = tu->vbus_state;
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tu->vbus_state = reg & TAHVO_STAT_VBUS;
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if (prev_state != tu->vbus_state) {
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extcon_set_state_sync(tu->extcon, EXTCON_USB, tu->vbus_state);
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sysfs_notify(&tu->pt_dev->dev.kobj, NULL, "vbus_state");
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}
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}
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static void tahvo_usb_become_host(struct tahvo_usb *tu)
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{
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struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
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extcon_set_state_sync(tu->extcon, EXTCON_USB_HOST, true);
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/* Power up the transceiver in USB host mode */
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retu_write(rdev, TAHVO_REG_USBR, USBR_REGOUT | USBR_NSUSPEND |
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USBR_MASTER_SW2 | USBR_MASTER_SW1);
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tu->phy.otg->state = OTG_STATE_A_IDLE;
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check_vbus_state(tu);
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}
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static void tahvo_usb_stop_host(struct tahvo_usb *tu)
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{
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tu->phy.otg->state = OTG_STATE_A_IDLE;
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}
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static void tahvo_usb_become_peripheral(struct tahvo_usb *tu)
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{
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struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
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extcon_set_state_sync(tu->extcon, EXTCON_USB_HOST, false);
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/* Power up transceiver and set it in USB peripheral mode */
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retu_write(rdev, TAHVO_REG_USBR, USBR_SLAVE_CONTROL | USBR_REGOUT |
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USBR_NSUSPEND | USBR_SLAVE_SW);
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tu->phy.otg->state = OTG_STATE_B_IDLE;
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check_vbus_state(tu);
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}
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static void tahvo_usb_stop_peripheral(struct tahvo_usb *tu)
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{
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if (tu->phy.otg->gadget)
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usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
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tu->phy.otg->state = OTG_STATE_B_IDLE;
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}
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static void tahvo_usb_power_off(struct tahvo_usb *tu)
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{
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struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
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/* Disable gadget controller if any */
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if (tu->phy.otg->gadget)
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usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
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/* Power off transceiver */
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retu_write(rdev, TAHVO_REG_USBR, 0);
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tu->phy.otg->state = OTG_STATE_UNDEFINED;
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}
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static int tahvo_usb_set_suspend(struct usb_phy *dev, int suspend)
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{
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struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, phy);
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struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
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u16 w;
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dev_dbg(&tu->pt_dev->dev, "%s\n", __func__);
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w = retu_read(rdev, TAHVO_REG_USBR);
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if (suspend)
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w &= ~USBR_NSUSPEND;
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else
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w |= USBR_NSUSPEND;
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retu_write(rdev, TAHVO_REG_USBR, w);
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return 0;
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}
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static int tahvo_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
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{
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struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb,
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phy);
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dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, host);
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mutex_lock(&tu->serialize);
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if (host == NULL) {
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if (tu->tahvo_mode == TAHVO_MODE_HOST)
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tahvo_usb_power_off(tu);
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otg->host = NULL;
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mutex_unlock(&tu->serialize);
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return 0;
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}
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if (tu->tahvo_mode == TAHVO_MODE_HOST) {
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otg->host = NULL;
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tahvo_usb_become_host(tu);
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}
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otg->host = host;
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mutex_unlock(&tu->serialize);
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return 0;
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}
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static int tahvo_usb_set_peripheral(struct usb_otg *otg,
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struct usb_gadget *gadget)
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{
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struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb,
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phy);
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dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, gadget);
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mutex_lock(&tu->serialize);
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if (!gadget) {
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if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
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tahvo_usb_power_off(tu);
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tu->phy.otg->gadget = NULL;
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mutex_unlock(&tu->serialize);
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return 0;
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}
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tu->phy.otg->gadget = gadget;
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if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
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tahvo_usb_become_peripheral(tu);
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mutex_unlock(&tu->serialize);
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return 0;
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}
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static irqreturn_t tahvo_usb_vbus_interrupt(int irq, void *_tu)
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{
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struct tahvo_usb *tu = _tu;
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mutex_lock(&tu->serialize);
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check_vbus_state(tu);
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mutex_unlock(&tu->serialize);
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return IRQ_HANDLED;
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}
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static ssize_t otg_mode_show(struct device *device,
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struct device_attribute *attr, char *buf)
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{
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struct tahvo_usb *tu = dev_get_drvdata(device);
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switch (tu->tahvo_mode) {
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case TAHVO_MODE_HOST:
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return sprintf(buf, "host\n");
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case TAHVO_MODE_PERIPHERAL:
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return sprintf(buf, "peripheral\n");
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}
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return -EINVAL;
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}
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static ssize_t otg_mode_store(struct device *device,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct tahvo_usb *tu = dev_get_drvdata(device);
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int r;
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mutex_lock(&tu->serialize);
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if (count >= 4 && strncmp(buf, "host", 4) == 0) {
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if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
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tahvo_usb_stop_peripheral(tu);
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tu->tahvo_mode = TAHVO_MODE_HOST;
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if (tu->phy.otg->host) {
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dev_info(device, "HOST mode: host controller present\n");
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tahvo_usb_become_host(tu);
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} else {
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dev_info(device, "HOST mode: no host controller, powering off\n");
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tahvo_usb_power_off(tu);
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}
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r = strlen(buf);
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} else if (count >= 10 && strncmp(buf, "peripheral", 10) == 0) {
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if (tu->tahvo_mode == TAHVO_MODE_HOST)
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tahvo_usb_stop_host(tu);
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tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
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if (tu->phy.otg->gadget) {
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dev_info(device, "PERIPHERAL mode: gadget driver present\n");
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tahvo_usb_become_peripheral(tu);
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} else {
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dev_info(device, "PERIPHERAL mode: no gadget driver, powering off\n");
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tahvo_usb_power_off(tu);
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}
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r = strlen(buf);
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} else {
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r = -EINVAL;
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}
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mutex_unlock(&tu->serialize);
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return r;
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}
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static DEVICE_ATTR(otg_mode, 0644, otg_mode_show, otg_mode_store);
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static struct attribute *tahvo_attributes[] = {
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&dev_attr_vbus.attr,
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&dev_attr_otg_mode.attr,
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NULL
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};
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static const struct attribute_group tahvo_attr_group = {
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.attrs = tahvo_attributes,
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};
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static int tahvo_usb_probe(struct platform_device *pdev)
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{
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struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
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struct tahvo_usb *tu;
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int ret;
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tu = devm_kzalloc(&pdev->dev, sizeof(*tu), GFP_KERNEL);
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if (!tu)
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return -ENOMEM;
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tu->phy.otg = devm_kzalloc(&pdev->dev, sizeof(*tu->phy.otg),
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GFP_KERNEL);
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if (!tu->phy.otg)
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return -ENOMEM;
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tu->pt_dev = pdev;
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/* Default mode */
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#ifdef CONFIG_TAHVO_USB_HOST_BY_DEFAULT
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tu->tahvo_mode = TAHVO_MODE_HOST;
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#else
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tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
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#endif
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mutex_init(&tu->serialize);
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tu->ick = devm_clk_get(&pdev->dev, "usb_l4_ick");
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if (!IS_ERR(tu->ick))
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clk_enable(tu->ick);
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/*
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* Set initial state, so that we generate kevents only on state changes.
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*/
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tu->vbus_state = retu_read(rdev, TAHVO_REG_IDSR) & TAHVO_STAT_VBUS;
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tu->extcon = devm_extcon_dev_allocate(&pdev->dev, tahvo_cable);
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if (IS_ERR(tu->extcon)) {
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dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
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ret = PTR_ERR(tu->extcon);
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goto err_disable_clk;
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}
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ret = devm_extcon_dev_register(&pdev->dev, tu->extcon);
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if (ret) {
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dev_err(&pdev->dev, "could not register extcon device: %d\n",
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ret);
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goto err_disable_clk;
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}
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/* Set the initial cable state. */
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extcon_set_state_sync(tu->extcon, EXTCON_USB_HOST,
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tu->tahvo_mode == TAHVO_MODE_HOST);
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extcon_set_state_sync(tu->extcon, EXTCON_USB, tu->vbus_state);
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/* Create OTG interface */
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tahvo_usb_power_off(tu);
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tu->phy.dev = &pdev->dev;
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tu->phy.otg->state = OTG_STATE_UNDEFINED;
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tu->phy.label = DRIVER_NAME;
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tu->phy.set_suspend = tahvo_usb_set_suspend;
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tu->phy.otg->usb_phy = &tu->phy;
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tu->phy.otg->set_host = tahvo_usb_set_host;
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tu->phy.otg->set_peripheral = tahvo_usb_set_peripheral;
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ret = usb_add_phy(&tu->phy, USB_PHY_TYPE_USB2);
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if (ret < 0) {
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dev_err(&pdev->dev, "cannot register USB transceiver: %d\n",
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ret);
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goto err_disable_clk;
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}
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dev_set_drvdata(&pdev->dev, tu);
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tu->irq = platform_get_irq(pdev, 0);
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ret = request_threaded_irq(tu->irq, NULL, tahvo_usb_vbus_interrupt,
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IRQF_ONESHOT,
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"tahvo-vbus", tu);
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if (ret) {
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dev_err(&pdev->dev, "could not register tahvo-vbus irq: %d\n",
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ret);
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goto err_remove_phy;
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}
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/* Attributes */
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ret = sysfs_create_group(&pdev->dev.kobj, &tahvo_attr_group);
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if (ret) {
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dev_err(&pdev->dev, "cannot create sysfs group: %d\n", ret);
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goto err_free_irq;
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}
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return 0;
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err_free_irq:
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free_irq(tu->irq, tu);
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err_remove_phy:
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usb_remove_phy(&tu->phy);
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err_disable_clk:
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if (!IS_ERR(tu->ick))
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clk_disable(tu->ick);
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return ret;
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}
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static int tahvo_usb_remove(struct platform_device *pdev)
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{
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struct tahvo_usb *tu = platform_get_drvdata(pdev);
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sysfs_remove_group(&pdev->dev.kobj, &tahvo_attr_group);
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free_irq(tu->irq, tu);
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usb_remove_phy(&tu->phy);
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if (!IS_ERR(tu->ick))
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clk_disable(tu->ick);
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return 0;
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}
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static struct platform_driver tahvo_usb_driver = {
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.probe = tahvo_usb_probe,
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.remove = tahvo_usb_remove,
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.driver = {
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.name = "tahvo-usb",
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},
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};
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module_platform_driver(tahvo_usb_driver);
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MODULE_DESCRIPTION("Tahvo USB transceiver driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs");
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MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
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