Merge "usb: gadget: gsi: Add a debugfs entry to simulate remote wakeup" (3d70cde6) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/usb/gadget/function/f_gsi.c

+204 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@
		#include <linux/usb/composite.h>
		#include <linux/debugfs.h>
		#include <linux/ipa_usb.h>
		#include <linux/timer.h>
		#include "f_gsi.h"
		#include "rndis.h"
		#include "debug.h"
		@@ -341,6 +342,202 @@ static const struct file_operations fops_usb_gsi = {
		.llseek = default_llseek,
		};

		static void debugfs_rw_timer_func(unsigned long arg)
		{
		struct f_gsi *gsi;

		gsi = (struct f_gsi *)arg;

		if (gsi && atomic_read(&gsi->connected)) {
		log_event_dbg("%s: calling gsi_wakeup_host\n", __func__);
		gsi_wakeup_host(gsi);
		} else {
		log_event_dbg("%s: gsi not connected..del timer\n", __func__);
		gsi->debugfs_rw_enable = 0;
		del_timer(&gsi->debugfs_rw_timer);
		return;
		}

		if (gsi->debugfs_rw_enable) {
		log_event_dbg("%s: re-arm the timer\n", __func__);
		mod_timer(&gsi->debugfs_rw_timer,
		jiffies + msecs_to_jiffies(gsi->debugfs_rw_interval));
		}
		}

		static struct f_gsi *get_connected_gsi(void)
		{
		struct f_gsi *connected_gsi;
		bool gsi_connected = false;
		unsigned i;

		for (i = 0; i < IPA_USB_MAX_TETH_PROT_SIZE; i++) {
		connected_gsi = gsi_prot_ctx[i];
		if (connected_gsi && atomic_read(&connected_gsi->connected)) {
		gsi_connected = true;
		break;
		}
		}

		if (!gsi_connected)
		connected_gsi = NULL;

		return connected_gsi;
		}

		#define DEFAULT_RW_TIMER_INTERVAL 500 /* in ms */
		static ssize_t usb_gsi_rw_write(struct file *file,
		const char __user ubuf, size_t count, loff_t ppos)
		{
		struct f_gsi *gsi;
		u8 input;
		int ret;

		gsi = get_connected_gsi();
		if (!gsi) {
		log_event_dbg("%s: gsi not connected\n", __func__);
		goto err;
		}

		if (ubuf == NULL) {
		log_event_dbg("%s: buffer is Null.\n", __func__);
		goto err;
		}

		ret = kstrtou8_from_user(ubuf, count, 0, &input);
		if (ret) {
		log_event_err("%s: Invalid value. err:%d\n", __func__, ret);
		goto err;
		}

		if (gsi->debugfs_rw_enable == !!input) {
		if (!!input)
		log_event_dbg("%s: RW already enabled\n", __func__);
		else
		log_event_dbg("%s: RW already disabled\n", __func__);
		goto err;
		}

		gsi->debugfs_rw_enable = !!input;
		if (gsi->debugfs_rw_enable) {
		init_timer(&gsi->debugfs_rw_timer);
		gsi->debugfs_rw_timer.data = (unsigned long) gsi;
		gsi->debugfs_rw_timer.function = debugfs_rw_timer_func;

		/* Use default remote wakeup timer interval if it is not set */
		if (!gsi->debugfs_rw_interval)
		gsi->debugfs_rw_interval = DEFAULT_RW_TIMER_INTERVAL;
		gsi->debugfs_rw_timer.expires = jiffies +
		msecs_to_jiffies(gsi->debugfs_rw_interval);
		add_timer(&gsi->debugfs_rw_timer);
		log_event_dbg("%s: timer initialized\n", __func__);
		} else {
		del_timer_sync(&gsi->debugfs_rw_timer);
		log_event_dbg("%s: timer deleted\n", __func__);
		}

		err:
		return count;
		}

		static int usb_gsi_rw_show(struct seq_file s, void unused)
		{

		struct f_gsi *gsi;

		gsi = get_connected_gsi();
		if (!gsi) {
		log_event_dbg("%s: gsi not connected\n", __func__);
		return 0;
		}

		seq_printf(s, "%d\n", gsi->debugfs_rw_enable);

		return 0;
		}

		static int usb_gsi_rw_open(struct inode inode, struct file f)
		{
		return single_open(f, usb_gsi_rw_show, inode->i_private);
		}

		static const struct file_operations fops_usb_gsi_rw = {
		.open = usb_gsi_rw_open,
		.read = seq_read,
		.write = usb_gsi_rw_write,
		.owner = THIS_MODULE,
		.llseek = seq_lseek,
		.release = seq_release,
		};

		static ssize_t usb_gsi_rw_timer_write(struct file *file,
		const char __user ubuf, size_t count, loff_t ppos)
		{
		struct f_gsi *gsi;
		u16 timer_val;
		int ret;

		gsi = get_connected_gsi();
		if (!gsi) {
		log_event_dbg("%s: gsi not connected\n", __func__);
		goto err;
		}

		if (ubuf == NULL) {
		log_event_dbg("%s: buffer is NULL.\n", __func__);
		goto err;
		}

		ret = kstrtou16_from_user(ubuf, count, 0, &timer_val);
		if (ret) {
		log_event_err("%s: Invalid value. err:%d\n", __func__, ret);
		goto err;
		}

		if (timer_val <= 0 \|\| timer_val > 10000) {
		log_event_err("%s: value must be > 0 and < 10000.\n", __func__);
		goto err;
		}

		gsi->debugfs_rw_interval = timer_val;
		err:
		return count;
		}

		static int usb_gsi_rw_timer_show(struct seq_file s, void unused)
		{
		struct f_gsi *gsi;
		unsigned timer_interval;

		gsi = get_connected_gsi();
		if (!gsi) {
		log_event_dbg("%s: gsi not connected\n", __func__);
		return 0;
		}

		timer_interval = DEFAULT_RW_TIMER_INTERVAL;
		if (gsi->debugfs_rw_interval)
		timer_interval = gsi->debugfs_rw_interval;

		seq_printf(s, "%ums\n", timer_interval);

		return 0;
		}

		static int usb_gsi_rw_timer_open(struct inode inode, struct file f)
		{
		return single_open(f, usb_gsi_rw_timer_show, inode->i_private);
		}

		static const struct file_operations fops_usb_gsi_rw_timer = {
		.open = usb_gsi_rw_timer_open,
		.read = seq_read,
		.write = usb_gsi_rw_timer_write,
		.owner = THIS_MODULE,
		.llseek = seq_lseek,
		.release = seq_release,
		};

		static int usb_gsi_debugfs_init(void)
		{
		debugfs.debugfs_root = debugfs_create_dir("usb_gsi", 0);
		@@ -349,6 +546,13 @@ static int usb_gsi_debugfs_init(void)

		debugfs_create_file("info", S_IRUSR, debugfs.debugfs_root,
		gsi_prot_ctx, &fops_usb_gsi);
		debugfs_create_file("remote_wakeup_enable", S_IRUSR \| S_IWUSR,
		debugfs.debugfs_root,
		gsi_prot_ctx, &fops_usb_gsi_rw);
		debugfs_create_file("remote_wakeup_interval", S_IRUSR \| S_IWUSR,
		debugfs.debugfs_root,
		gsi_prot_ctx,
		&fops_usb_gsi_rw_timer);
		return 0;
		}

drivers/usb/gadget/function/f_gsi.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -227,6 +227,10 @@ struct f_gsi {

		struct gsi_data_port d_port;
		struct gsi_ctrl_port c_port;
		/* To test remote wakeup using debugfs */
		struct timer_list debugfs_rw_timer;
		u8 debugfs_rw_enable;
		u16 debugfs_rw_interval;
		};

		static struct f_gsi *gsi_prot_ctx[IPA_USB_MAX_TETH_PROT_SIZE];