s3c-hsudc: Add regulator handling
From: Heiko Stuebner <heiko@...> Date: Fri, 16 Dec 2011 17:28:23 +0100
Commit-Message
The udc has three supplies: vdda (3.3V), vddi (1.2V) and vddosc (1.8-3.3V). Turn these on and off on start and stop calls. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
drivers/usb/gadget/s3c-hsudc.c | 41 ++++++++++++++++++++++++++++++++++++--- 1 files changed, 37 insertions(+), 4 deletions(-)
Statistics
- 37 lines added
- 4 lines removed
Changes
------------------------ drivers/usb/gadget/s3c-hsudc.c ------------------------
index d17cbcf..c8ac13a 100644
@@ -29,6 +29,7 @@
#include <linux/usb/otg.h>
#include <linux/prefetch.h>
#include <linux/platform_data/s3c-hsudc.h>
+#include <linux/regulator/consumer.h>
#include <mach/regs-s3c2443-clock.h>
@@ -87,6 +88,12 @@
#define DATA_STATE_XMIT (1)
#define DATA_STATE_RECV (2)
+static const char * const s3c_hsudc_supply_names[] = {
+ "vdda", /* analog phy supply, 3.3V */
+ "vddi", /* digital phy supply, 1.2V */
+ "vddosc", /* oscillator supply, 1.8V - 3.3V */
+};
+
/**
* struct s3c_hsudc_ep - Endpoint representation used by driver.
* @ep: USB gadget layer representation of device endpoint.
@@ -139,6 +146,7 @@ struct s3c_hsudc {
struct device *dev;
struct s3c24xx_hsudc_platdata *pd;
struct otg_transceiver *transceiver;
+ struct regulator_bulk_data supplies[ARRAY_SIZE(s3c_hsudc_supply_names)];
spinlock_t lock;
void __iomem *regs;
struct resource *mem_rsrc;
@@ -1150,15 +1158,20 @@ static int s3c_hsudc_start(struct usb_gadget *gadget,
hsudc->driver = driver;
hsudc->gadget.dev.driver = &driver->driver;
+ ret = regulator_bulk_enable(ARRAY_SIZE(hsudc->supplies),
+ hsudc->supplies);
+ if (ret != 0) {
+ dev_err(hsudc->dev, "failed to enable supplies: %d\n", ret);
+ goto err_supplies;
+ }
+
/* connect to bus through transceiver */
if (hsudc->transceiver) {
ret = otg_set_peripheral(hsudc->transceiver, &hsudc->gadget);
if (ret) {
dev_err(hsudc->dev, "%s: can't bind to transceiver\n",
hsudc->gadget.name);
+ goto err_otg;
}
}
@@ -1171,6 +1184,12 @@ static int s3c_hsudc_start(struct usb_gadget *gadget,
hsudc->pd->gpio_init();
return 0;
+err_otg:
+ regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
+err_supplies:
+ hsudc->driver = NULL;
+ hsudc->gadget.dev.driver = NULL;
+ return ret;
}
static int s3c_hsudc_stop(struct usb_gadget *gadget,
@@ -1200,6 +1219,8 @@ static int s3c_hsudc_stop(struct usb_gadget *gadget,
disable_irq(hsudc->irq);
+ regulator_bulk_disable(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
+
dev_info(hsudc->dev, "unregistered gadget driver '%s'\n",
driver->driver.name);
return 0;
@@ -1241,7 +1262,7 @@ static int __devinit s3c_hsudc_probe(struct platform_device *pdev)
struct resource *res;
struct s3c_hsudc *hsudc;
struct s3c24xx_hsudc_platdata *pd = pdev->dev.platform_data;
+ int ret, i;
hsudc = kzalloc(sizeof(struct s3c_hsudc) +
sizeof(struct s3c_hsudc_ep) * pd->epnum,
@@ -1258,6 +1279,16 @@ static int __devinit s3c_hsudc_probe(struct platform_device *pdev)
hsudc->transceiver = otg_get_transceiver();
+ for (i = 0; i < ARRAY_SIZE(hsudc->supplies); i++)
+ hsudc->supplies[i].supply = s3c_hsudc_supply_names[i];
+
+ ret = regulator_bulk_get(dev, ARRAY_SIZE(hsudc->supplies),
+ hsudc->supplies);
+ if (ret != 0) {
+ dev_err(dev, "failed to request supplies: %d\n", ret);
+ goto err_supplies;
+ }
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "unable to obtain driver resource data\n");
@@ -1352,6 +1383,8 @@ err_res:
if (hsudc->transceiver)
otg_put_transceiver(hsudc->transceiver);
+ regulator_bulk_free(ARRAY_SIZE(hsudc->supplies), hsudc->supplies);
+err_supplies:
kfree(hsudc);
return ret;
}