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include:spf-0014ca01.pphosted.com include:spf.protection.outlook.com include:auth.msgapp.com include:spf.mandrillapp.com ~all X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-18_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_check_notspam policy=outbound_check score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=840 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811180097 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Patch adds feature that allow to change role from user space. Signed-off-by: Pawel Laszczak --- drivers/usb/cdns3/Makefile | 2 +- drivers/usb/cdns3/core.c | 2 + drivers/usb/cdns3/debugfs.c | 93 +++++++++++++++++++++++++++++++++++++ drivers/usb/cdns3/drd.h | 3 ++ 4 files changed, 99 insertions(+), 1 deletion(-) create mode 100644 drivers/usb/cdns3/debugfs.c diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile index 34e60d03c4ec..08e6cdbebd46 100644 --- a/drivers/usb/cdns3/Makefile +++ b/drivers/usb/cdns3/Makefile @@ -1,7 +1,7 @@ obj-$(CONFIG_USB_CDNS3) += cdns3.o obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci.o -cdns3-y := core.o drd.o +cdns3-y := core.o drd.o debugfs.o cdns3-$(CONFIG_USB_CDNS3_GADGET) += gadget.o ep0.o debug.o cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o cdns3-pci-y := cdns3-pci-wrap.o diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c index 1fa233415901..304323b643f2 100644 --- a/drivers/usb/cdns3/core.c +++ b/drivers/usb/cdns3/core.c @@ -323,6 +323,7 @@ static int cdns3_probe(struct platform_device *pdev) goto err2; } + cdns3_debugfs_init(cdns); device_set_wakeup_capable(dev, true); pm_runtime_set_active(dev); pm_runtime_enable(dev); @@ -358,6 +359,7 @@ static int cdns3_remove(struct platform_device *pdev) pm_runtime_get_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); + cdns3_debugfs_exit(cdns); cdns3_remove_roles(cdns); return 0; diff --git a/drivers/usb/cdns3/debugfs.c b/drivers/usb/cdns3/debugfs.c new file mode 100644 index 000000000000..189b12d96cbf --- /dev/null +++ b/drivers/usb/cdns3/debugfs.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Cadence USBSS DRD Controller DebugFS filer. + * + * Copyright (C) 2018 Cadence. + * + * Author: Pawel Laszczak + */ + +#include +#include +#include +#include + +#include "core.h" +#include "gadget.h" + +static int cdns3_mode_show(struct seq_file *s, void *unused) +{ + struct cdns3 *cdns = s->private; + + switch (cdns->current_dr_mode) { + case USB_DR_MODE_HOST: + seq_puts(s, "host\n"); + break; + case USB_DR_MODE_PERIPHERAL: + seq_puts(s, "device\n"); + break; + case USB_DR_MODE_OTG: + seq_puts(s, "otg\n"); + break; + default: + seq_puts(s, "UNKNOWN mode\n"); + } + + return 0; +} + +static int cdns3_mode_open(struct inode *inode, struct file *file) +{ + return single_open(file, cdns3_mode_show, inode->i_private); +} + +static ssize_t cdns3_mode_write(struct file *file, + const char __user *ubuf, + size_t count, loff_t *ppos) +{ + struct seq_file *s = file->private_data; + struct cdns3 *cdns = s->private; + u32 mode = 0; + char buf[32]; + + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) + return -EFAULT; + + if (!strncmp(buf, "host", 4)) + mode = USB_DR_MODE_HOST; + + if (!strncmp(buf, "device", 6)) + mode = USB_DR_MODE_PERIPHERAL; + + if (!strncmp(buf, "otg", 3)) + mode = USB_DR_MODE_OTG; + + cdns->desired_dr_mode = mode; + queue_work(system_freezable_wq, &cdns->role_switch_wq); + return count; +} + +static const struct file_operations cdns3_mode_fops = { + .open = cdns3_mode_open, + .write = cdns3_mode_write, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +void cdns3_debugfs_init(struct cdns3 *cdns) +{ + struct dentry *root; + + root = debugfs_create_dir(dev_name(cdns->dev), NULL); + cdns->root = root; + if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET) && + IS_ENABLED(CONFIG_USB_CDNS3_HOST)) + debugfs_create_file("mode", 0644, root, cdns, + &cdns3_mode_fops); +} + +void cdns3_debugfs_exit(struct cdns3 *cdns) +{ + debugfs_remove_recursive(cdns->root); +} diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h index 0faa7520ecac..8367032e12a3 100644 --- a/drivers/usb/cdns3/drd.h +++ b/drivers/usb/cdns3/drd.h @@ -119,4 +119,7 @@ int cdns3_drd_init(struct cdns3 *cdns); int cdns3_drd_update_mode(struct cdns3 *cdns); irqreturn_t cdns3_drd_irq(struct cdns3 *cdns); +void cdns3_debugfs_init(struct cdns3 *cdns); +void cdns3_debugfs_exit(struct cdns3 *cdns); + #endif /* __LINUX_CDNS3_DRD */ -- 2.17.1