forked from luck/tmp_suning_uos_patched
e6b5be2be4
Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlSOD20ACgkQMUfUDdst+ylLPACg2QrW1oHhdTMT9WI8jihlHVRM 53kAoLeteByQ3iVwWurwwseRPiWa8+MI =OVRS -----END PGP SIGNATURE----- Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core update from Greg KH: "Here's the set of driver core patches for 3.19-rc1. They are dominated by the removal of the .owner field in platform drivers. They touch a lot of files, but they are "simple" changes, just removing a line in a structure. Other than that, a few minor driver core and debugfs changes. There are some ath9k patches coming in through this tree that have been acked by the wireless maintainers as they relied on the debugfs changes. Everything has been in linux-next for a while" * tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits) Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries" fs: debugfs: add forward declaration for struct device type firmware class: Deletion of an unnecessary check before the function call "vunmap" firmware loader: fix hung task warning dump devcoredump: provide a one-way disable function device: Add dev_<level>_once variants ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries ath: use seq_file api for ath9k debugfs files debugfs: add helper function to create device related seq_file drivers/base: cacheinfo: remove noisy error boot message Revert "core: platform: add warning if driver has no owner" drivers: base: support cpu cache information interface to userspace via sysfs drivers: base: add cpu_device_create to support per-cpu devices topology: replace custom attribute macros with standard DEVICE_ATTR* cpumask: factor out show_cpumap into separate helper function driver core: Fix unbalanced device reference in drivers_probe driver core: fix race with userland in device_add() sysfs/kernfs: make read requests on pre-alloc files use the buffer. sysfs/kernfs: allow attributes to request write buffer be pre-allocated. fs: sysfs: return EGBIG on write if offset is larger than file size ...
461 lines
11 KiB
C
461 lines
11 KiB
C
/*
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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 char *tahvo_cable[] = {
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"USB-HOST",
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"USB",
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NULL,
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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, "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, "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, "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);
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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.name = DRIVER_NAME;
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tu->extcon.supported_cable = tahvo_cable;
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tu->extcon.dev.parent = &pdev->dev;
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ret = extcon_dev_register(&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_cable_state(&tu->extcon, "USB-HOST",
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tu->tahvo_mode == TAHVO_MODE_HOST);
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extcon_set_cable_state(&tu->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_extcon_unreg;
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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, 0,
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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_extcon_unreg:
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extcon_dev_unregister(&tu->extcon);
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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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extcon_dev_unregister(&tu->extcon);
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if (!IS_ERR(tu->ick))
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clk_disable(tu->ick);
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|
|
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>");
|