usb: gadget: dummy_hcd: add setup / cleanup of multiple HW intances

This patch creates & adds multiple instances of the HCD and UDC. We have
a new module option "num" which says how many emulated UDCs + HCDs we
want. The default value is one and currently the maximum is one as well.
This will change soon.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 72 insertions, 25 deletions

diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index dffcf34d18d1..70f70ea133dd 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -63,16 +63,20 @@ MODULE_LICENSE("GPL");
 struct dummy_hcd_module_parameters {
         bool is_super_speed;
         bool is_high_speed;
+        unsigned int num;
 };
 
 static struct dummy_hcd_module_parameters mod_data = {
         .is_super_speed = false,
         .is_high_speed = true,
+        .num = 1,
 };
 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
+module_param_named(num, mod_data.num, uint, S_IRUGO);
+MODULE_PARM_DESC(num, "number of emulated controllers");
 /*-------------------------------------------------------------------------*/
 
 /* gadget side driver data structres */
@@ -2634,6 +2638,7 @@ static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
 static int __init init(void)
 {
         int     retval = -ENOMEM;
+        int     i;
 
         if (usb_disabled())
                 return -ENODEV;
@@ -2641,12 +2646,29 @@ static int __init init(void)
         if (!mod_data.is_high_speed && mod_data.is_super_speed)
                 return -EINVAL;
 
-        the_hcd_pdev[0] = platform_device_alloc(driver_name, 0);
-        if (!the_hcd_pdev[0])
-                return retval;
-        the_udc_pdev[0] = platform_device_alloc(gadget_name, 0);
-        if (!the_udc_pdev[0])
-                goto err_alloc_udc;
+        if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
+                pr_err("Number of emulated UDC must be in range of 1…%d\n",
+                                MAX_NUM_UDC);
+                return -EINVAL;
+        }
+        for (i = 0; i < mod_data.num; i++) {
+                the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
+                if (!the_hcd_pdev[i]) {
+                        i--;
+                        while (i >= 0)
+                                platform_device_put(the_hcd_pdev[i--]);
+                        return retval;
+                }
+        }
+        for (i = 0; i < mod_data.num; i++) {
+                the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
+                if (!the_udc_pdev[i]) {
+                        i--;
+                        while (i >= 0)
+                                platform_device_put(the_udc_pdev[i--]);
+                        goto err_alloc_udc;
+                }
+        }
 
         retval = platform_driver_register(&dummy_hcd_driver);
         if (retval < 0)
@@ -2655,9 +2677,15 @@ static int __init init(void)
         if (retval < 0)
                 goto err_register_udc_driver;
 
-        retval = platform_device_add(the_hcd_pdev[0]);
-        if (retval < 0)
-                goto err_add_hcd;
+        for (i = 0; i < mod_data.num; i++) {
+                retval = platform_device_add(the_hcd_pdev[i]);
+                if (retval < 0) {
+                        i--;
+                        while (i >= 0)
+                                platform_device_del(the_hcd_pdev[i--]);
+                        goto err_add_hcd;
+                }
+        }
         if (!the_controller.hs_hcd ||
             (!the_controller.ss_hcd && mod_data.is_super_speed)) {
                 /*
@@ -2667,39 +2695,58 @@ static int __init init(void)
                 retval = -EINVAL;
                 goto err_add_udc;
         }
-        retval = platform_device_add(the_udc_pdev[0]);
-        if (retval < 0)
-                goto err_add_udc;
-        if (!platform_get_drvdata(the_udc_pdev[0])) {
-                /*
-                 * The udc was added successfully but its probe function failed
-                 * for some reason.
-                 */
-                retval = -EINVAL;
-                goto err_probe_udc;
+
+
+        for (i = 0; i < mod_data.num; i++) {
+                retval = platform_device_add(the_udc_pdev[i]);
+                if (retval < 0) {
+                        i--;
+                        while (i >= 0)
+                                platform_device_del(the_udc_pdev[i]);
+                        goto err_add_udc;
+                }
+        }
+
+        for (i = 0; i < mod_data.num; i++) {
+                if (!platform_get_drvdata(the_udc_pdev[i])) {
+                        /*
+                         * The udc was added successfully but its probe
+                         * function failed for some reason.
+                         */
+                        retval = -EINVAL;
+                        goto err_probe_udc;
+                }
         }
         return retval;
 
 err_probe_udc:
-        platform_device_del(the_udc_pdev[0]);
+        for (i = 0; i < mod_data.num; i++)
+                platform_device_del(the_udc_pdev[i]);
 err_add_udc:
-        platform_device_del(the_hcd_pdev[0]);
+        for (i = 0; i < mod_data.num; i++)
+                platform_device_del(the_hcd_pdev[i]);
 err_add_hcd:
         platform_driver_unregister(&dummy_udc_driver);
 err_register_udc_driver:
         platform_driver_unregister(&dummy_hcd_driver);
 err_register_hcd_driver:
-        platform_device_put(the_udc_pdev[0]);
+        for (i = 0; i < mod_data.num; i++)
+                platform_device_put(the_udc_pdev[i]);
 err_alloc_udc:
-        platform_device_put(the_hcd_pdev[0]);
+        for (i = 0; i < mod_data.num; i++)
+                platform_device_put(the_hcd_pdev[i]);
         return retval;
 }
 module_init(init);
 
 static void __exit cleanup(void)
 {
-        platform_device_unregister(the_udc_pdev[0]);
-        platform_device_unregister(the_hcd_pdev[0]);
+        int i;
+
+        for (i = 0; i < mod_data.num; i++) {
+                platform_device_unregister(the_udc_pdev[i]);
+                platform_device_unregister(the_hcd_pdev[i]);
+        }
         platform_driver_unregister(&dummy_udc_driver);
         platform_driver_unregister(&dummy_hcd_driver);
 }