463 lines
11 KiB
C
463 lines
11 KiB
C
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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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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of this
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* archive for more details.
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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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#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.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_cable_state_(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_cable_state_(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_cable_state_(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 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);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set initial state, so that we generate kevents only on state changes.
|
||
|
|
*/
|
||
|
|
tu->vbus_state = retu_read(rdev, TAHVO_REG_IDSR) & TAHVO_STAT_VBUS;
|
||
|
|
|
||
|
|
tu->extcon = devm_extcon_dev_allocate(&pdev->dev, tahvo_cable);
|
||
|
|
if (IS_ERR(tu->extcon)) {
|
||
|
|
dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
|
||
|
|
ret = PTR_ERR(tu->extcon);
|
||
|
|
goto err_disable_clk;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = devm_extcon_dev_register(&pdev->dev, tu->extcon);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&pdev->dev, "could not register extcon device: %d\n",
|
||
|
|
ret);
|
||
|
|
goto err_disable_clk;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Set the initial cable state. */
|
||
|
|
extcon_set_cable_state_(tu->extcon, EXTCON_USB_HOST,
|
||
|
|
tu->tahvo_mode == TAHVO_MODE_HOST);
|
||
|
|
extcon_set_cable_state_(tu->extcon, EXTCON_USB, tu->vbus_state);
|
||
|
|
|
||
|
|
/* Create OTG interface */
|
||
|
|
tahvo_usb_power_off(tu);
|
||
|
|
tu->phy.dev = &pdev->dev;
|
||
|
|
tu->phy.otg->state = OTG_STATE_UNDEFINED;
|
||
|
|
tu->phy.label = DRIVER_NAME;
|
||
|
|
tu->phy.set_suspend = tahvo_usb_set_suspend;
|
||
|
|
|
||
|
|
tu->phy.otg->usb_phy = &tu->phy;
|
||
|
|
tu->phy.otg->set_host = tahvo_usb_set_host;
|
||
|
|
tu->phy.otg->set_peripheral = tahvo_usb_set_peripheral;
|
||
|
|
|
||
|
|
ret = usb_add_phy(&tu->phy, USB_PHY_TYPE_USB2);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(&pdev->dev, "cannot register USB transceiver: %d\n",
|
||
|
|
ret);
|
||
|
|
goto err_disable_clk;
|
||
|
|
}
|
||
|
|
|
||
|
|
dev_set_drvdata(&pdev->dev, tu);
|
||
|
|
|
||
|
|
tu->irq = platform_get_irq(pdev, 0);
|
||
|
|
ret = request_threaded_irq(tu->irq, NULL, tahvo_usb_vbus_interrupt,
|
||
|
|
IRQF_ONESHOT,
|
||
|
|
"tahvo-vbus", tu);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&pdev->dev, "could not register tahvo-vbus irq: %d\n",
|
||
|
|
ret);
|
||
|
|
goto err_remove_phy;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Attributes */
|
||
|
|
ret = sysfs_create_group(&pdev->dev.kobj, &tahvo_attr_group);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(&pdev->dev, "cannot create sysfs group: %d\n", ret);
|
||
|
|
goto err_free_irq;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_free_irq:
|
||
|
|
free_irq(tu->irq, tu);
|
||
|
|
err_remove_phy:
|
||
|
|
usb_remove_phy(&tu->phy);
|
||
|
|
err_disable_clk:
|
||
|
|
if (!IS_ERR(tu->ick))
|
||
|
|
clk_disable(tu->ick);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int tahvo_usb_remove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct tahvo_usb *tu = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
sysfs_remove_group(&pdev->dev.kobj, &tahvo_attr_group);
|
||
|
|
free_irq(tu->irq, tu);
|
||
|
|
usb_remove_phy(&tu->phy);
|
||
|
|
if (!IS_ERR(tu->ick))
|
||
|
|
clk_disable(tu->ick);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct platform_driver tahvo_usb_driver = {
|
||
|
|
.probe = tahvo_usb_probe,
|
||
|
|
.remove = tahvo_usb_remove,
|
||
|
|
.driver = {
|
||
|
|
.name = "tahvo-usb",
|
||
|
|
},
|
||
|
|
};
|
||
|
|
module_platform_driver(tahvo_usb_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Tahvo USB transceiver driver");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs");
|
||
|
|
MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
|