usb:hsotg:samsung: Use of regulator_bulk_* functions for USB regulators

This commit adds support for supply voltage management for s3c-hsotg IP
block. For that purpose a convenient regulator_bulk_* functions have been
used.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Liam Girdwood <lrg@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 39 insertions, 2 deletions

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 3484a09d1ddb..e1a54d21ecaf 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -27,6 +27,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
@@ -38,6 +39,11 @@
 
 #define DMA_ADDR_INVALID (~((dma_addr_t)0))
 
+static const char * const s3c_hsotg_supply_names[] = {
+        "vusb_d",               /* digital USB supply, 1.2V */
+        "vusb_a",               /* analog USB supply, 1.1V */
+};
+
 /* EP0_MPS_LIMIT
  *
  * Unfortunately there seems to be a limit of the amount of data that can
@@ -132,6 +138,7 @@ struct s3c_hsotg_ep {
  * @regs: The memory area mapped for accessing registers.
  * @regs_res: The resource that was allocated when claiming register space.
  * @irq: The IRQ number we are using
+ * @supplies: Definition of USB power supplies
  * @dedicated_fifos: Set if the hardware has dedicated IN-EP fifos.
  * @debug_root: root directrory for debugfs.
  * @debug_file: main status file for debugfs.
@@ -152,6 +159,8 @@ struct s3c_hsotg {
         int                     irq;
         struct clk              *clk;
 
+        struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsotg_supply_names)];
+
         unsigned int            dedicated_fifos:1;
 
         struct dentry           *debug_root;
@@ -3256,6 +3265,7 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
         struct resource *res;
         int epnum;
         int ret;
+        int i;
 
         plat = pdev->dev.platform_data;
         if (!plat) {
@@ -3350,6 +3360,26 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
 
         clk_enable(hsotg->clk);
 
+        /* regulators */
+
+        for (i = 0; i < ARRAY_SIZE(hsotg->supplies); i++)
+                hsotg->supplies[i].supply = s3c_hsotg_supply_names[i];
+
+        ret = regulator_bulk_get(dev, ARRAY_SIZE(hsotg->supplies),
+                                 hsotg->supplies);
+        if (ret) {
+                dev_err(dev, "failed to request supplies: %d\n", ret);
+                goto err_supplies;
+        }
+
+        ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),
+                                    hsotg->supplies);
+
+        if (ret) {
+                dev_err(hsotg->dev, "failed to enable supplies: %d\n", ret);
+                goto err_supplies;
+        }
+
         /* usb phy enable */
         s3c_hsotg_phy_enable(hsotg);
 
@@ -3362,7 +3392,7 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
 
         ret = usb_add_gadget_udc(&pdev->dev, &hsotg->gadget);
         if (ret)
-                goto err_add_udc;
+                goto err_supplies;
 
         s3c_hsotg_create_debug(hsotg);
 
@@ -3371,9 +3401,12 @@ static int __devinit s3c_hsotg_probe(struct platform_device *pdev)
         our_hsotg = hsotg;
         return 0;
 
-err_add_udc:
+err_supplies:
         s3c_hsotg_phy_disable(hsotg);
 
+        regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
+        regulator_bulk_free(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
+
         clk_disable(hsotg->clk);
         clk_put(hsotg->clk);
 
@@ -3408,6 +3441,10 @@ static int __devexit s3c_hsotg_remove(struct platform_device *pdev)
 
         s3c_hsotg_phy_disable(hsotg);
 
+
+        regulator_bulk_disable(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
+        regulator_bulk_free(ARRAY_SIZE(hsotg->supplies), hsotg->supplies);
+
         clk_disable(hsotg->clk);
         clk_put(hsotg->clk);