imx6 android gadget,imx6Q USB OTG Host/Device纯软件切换

╰+哭是因爲堅強的太久メ 2022-10-05 00:53 168阅读 0赞

From 87f295ccaf081b4ef06218fc8028d3c3d075ede7 Mon Sep 17 00:00:00 2001

From: hongjiujin

Date: Tue, 2 Jan 2018 10:39:04 +0800

Subject: \[PATCH\] imx6: chipidea

The hardware didn't use OTG\_ID pin in design and use USB A for OTG.

Chipidea will initialize otg to HOST once boot completed, which read OTGSC\_IDIE.

So we implement otg role switch in SW only(/sys/kernel/debug/ci\_hdrc.0/otgswitch).

\---

debug.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 110 insertions(+)

diff --git a/debug.c b/debug.c

index a4f7db2..b215674 100644

\--- a/debug.c

\+++ b/debug.c

@@ -16,6 +16,7 @@

\#include "udc.h"

\#include "bits.h"

\#include "otg.h"

\+\#include "host.h"

/\*\*

\* ci\_device\_show: prints information about device capabilities and status

@@ -343,6 +344,110 @@ static const struct file\_operations ci\_role\_fops = \{

.release    = single\_release,

\};

\+\#define CI\_VBUS\_STABLE\_TIMEOUT\_MS 100

\+void handle\_otg\_switch(struct ci\_hdrc \*ci, enum ci\_role role)

\+\{

\+    int ret = 0;

\+    if (role != ci->role) \{

\+        dev\_dbg(ci->dev, "switching from %s to %s\\n",

\+            ci\_role(ci)->name, ci->roles\[role\]->name);

\+        while (ci\_hdrc\_host\_has\_device(ci)) \{

\+            enable\_irq(ci->irq);

\+            usleep\_range(10000, 15000);

\+            disable\_irq\_nosync(ci->irq);

\+        \}

\+        ci\_role\_stop(ci);

\+        if (role == CI\_ROLE\_GADGET) \{

\+            /\* wait vbus lower than OTGSC\_BSV \*/

\+            ret = hw\_wait\_reg(ci, OP\_OTGSC, OTGSC\_BSV, 0,

\+                    CI\_VBUS\_STABLE\_TIMEOUT\_MS);

\+        \}

\+        else if (ci->vbus\_active)

\+            /\*

\+             \* If the role switch happens(e.g. during

\+             \* system sleep), and we lose vbus drop

\+             \* event, disconnect gadget for it before

\+             \* start host.

\+             \*/

\+               usb\_gadget\_vbus\_disconnect(&ci->gadget);

\+        ci\_role\_start(ci, role);

\+        /\*

\+         \* If the role switch happens(e.g. during system

\+         \* sleep) and vbus keeps on afterwards, we connect

\+         \* gadget as vbus connect event lost.

\+         \*/

\+        if (ret == -ETIMEDOUT)

\+            usb\_gadget\_vbus\_connect(&ci->gadget);

\+    \}

\+\}

\+static int ci\_otgswitch\_show(struct seq\_file \*s, void \*data)

\+\{

\+    struct ci\_hdrc \*ci = s->private;

\+    seq\_printf(s, "%s\\n", ci\_role(ci)->name);

\+    return 0;

\+\}

\+static ssize\_t ci\_otgswitch\_write(struct file \*file, const char \_\_user \*ubuf,

\+                 size\_t count, loff\_t \*ppos)

\+\{

\+    struct seq\_file \*s = file->private\_data;

\+    struct ci\_hdrc \*ci = s->private;

\+    enum ci\_role role;

\+    char buf\[8\];

\+    int ret;

\+    if (copy\_from\_user(buf, ubuf, min\_t(size\_t, sizeof(buf) - 1, count)))

\+    return -EFAULT;

\+    for (role = CI\_ROLE\_HOST; role < CI\_ROLE\_END; role++)

\+     if (ci->roles\[role\] &&

\+        !strncmp(buf, ci->roles\[role\]->name,

\+        strlen(ci->roles\[role\]->name)))

\+        break;

\+     if (role == CI\_ROLE\_END || role == ci->role)

\+        return -EINVAL;

\+    pm\_runtime\_get\_sync(ci->dev);

\+    disable\_irq(ci->irq);

\+    if (role == CI\_ROLE\_HOST) \{

\+        ci->fsm.id = 0;

\+    \} else if (role == CI\_ROLE\_GADGET) \{

\+        ci->fsm.id = 1;

\+    \}

\+    handle\_otg\_switch(ci, role);

\+    enable\_irq(ci->irq);

\+    pm\_runtime\_put\_sync(ci->dev);

\+    return ret ? ret : count;

\+\}

\+static int ci\_otgswitch\_open(struct inode \*inode, struct file \*file)

\+\{

\+    return single\_open(file, ci\_otgswitch\_show, inode->i\_private);

\+\}

\+static const struct file\_operations ci\_otgswitch\_fops = \{

\+    .open        = ci\_otgswitch\_open,

\+    .write        = ci\_otgswitch\_write,

\+    .read        = seq\_read,

\+    .llseek        = seq\_lseek,

\+    .release    = single\_release,

\+\};

static int ci\_registers\_show(struct seq\_file \*s, void \*unused)

struct ci\_hdrc \*ci = s->private;

@@ -433,6 +538,11 @@ int dbg\_create\_files(struct ci\_hdrc \*ci)

if (!dent)

goto err;

\+    dent = debugfs\_create\_file("otgswitch", S\_IRUGO | S\_IWUSR, ci->debugfs, ci,

\+                   &ci\_otgswitch\_fops);

\+    if (!dent)

\+        goto err;

dent = debugfs\_create\_file("registers", S\_IRUGO, ci->debugfs, ci,

&ci\_registers\_fops);

\--

2.7.4

imx6 android gadget,imx6Q USB OTG Host/Device纯软件切换

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