tegra: add CONSOLE_MUX support to tegra-kbc

Add support for CONSOLE_MUX to tegra-kbc driver.  This requires
adding a flag to struct keyb to know the driver has already been
initialized so if we try to initialize it again we can just return
success.  Also call into iomux_doenv() from drv_keyboard_init to
re-evaluate the stdin string.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

diff --git a/drivers/input/tegra-kbc.c b/drivers/input/tegra-kbc.c
index ab7a9e33ee0bf86e1539bc8e90a2b250d13c8f36..88471d3edf253e432458a44fb0c8d5ed29317d47 100644 (file)
--- a/drivers/input/tegra-kbc.c
+++ b/drivers/input/tegra-kbc.c
@@ -63,6 +63,7 @@ static struct keyb {
        struct kbc_tegra *kbc;          /* tegra keyboard controller */
        unsigned char inited;           /* 1 if keyboard has been inited */
        unsigned char first_scan;       /* 1 if this is our first key scan */
+       unsigned char created;          /* 1 if driver has been created */
 
        /*
         * After init we must wait a short time before polling the keyboard.
@@ -306,6 +307,10 @@ static void tegra_kbc_open(void)
  */
 static int init_tegra_keyboard(void)
 {
+       /* check if already created */
+       if (config.created)
+               return 0;
+
 #ifdef CONFIG_OF_CONTROL
        int     node;
 
@@ -349,6 +354,7 @@ static int init_tegra_keyboard(void)
        config_kbc_gpio(config.kbc);
 
        tegra_kbc_open();
+       config.created = 1;
        debug("%s: Tegra keyboard ready\n", __func__);
 
        return 0;
@@ -357,6 +363,8 @@ static int init_tegra_keyboard(void)
 int drv_keyboard_init(void)
 {
        struct stdio_dev dev;
+       char *stdinname = getenv("stdin");
+       int error;
 
        if (input_init(&config.input, 0)) {
                debug("%s: Cannot set up input\n", __func__);
@@ -372,5 +380,13 @@ int drv_keyboard_init(void)
        dev.start = init_tegra_keyboard;
 
        /* Register the device. init_tegra_keyboard() will be called soon */
-       return input_stdio_register(&dev);
+       error = input_stdio_register(&dev);
+       if (error)
+               return error;
+#ifdef CONFIG_CONSOLE_MUX
+       error = iomux_doenv(stdin, stdinname);
+       if (error)
+               return error;
+#endif
+       return 0;
 }