Initialize the host and gagdet subsystems of the musb driver only when
the appropriate mode is selected from platform data, or device-tree
information, respectively.
Refuse to start the gadget part if the port is in host-only mode.
Signed-off-by: Daniel Mack <zon...@gmail.com>
---
drivers/usb/musb/musb_core.c | 25 +++++++++++++++++--------
drivers/usb/musb/musb_core.h | 7 +++++++
drivers/usb/musb/musb_gadget.c | 5 +++++
3 files changed, 29 insertions(+), 8 deletions(-)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index cb1631e..c021058 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -943,10 +943,12 @@ void musb_start(struct musb *musb)
* (b) vbus present/connect IRQ, peripheral mode;
* (c) peripheral initiates, using SRP
*/
- if ((devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS)
+ if (musb->port_mode != MUSB_PORT_MODE_HOST &&
+ (devctl & MUSB_DEVCTL_VBUS) == MUSB_DEVCTL_VBUS) {
musb->is_active = 1;
- else
+ } else {
devctl |= MUSB_DEVCTL_SESSION;
+ }
musb_platform_enable(musb);
musb_writeb(regs, MUSB_DEVCTL, devctl);
@@ -1868,6 +1870,7 @@ musb_init_controller(struct device *dev, int nIrq, void
__iomem *ctrl)
musb->board_set_power = plat->set_power;
musb->min_power = plat->min_power;
musb->ops = plat->platform_ops;
+ musb->port_mode = plat->mode;
/* The musb_platform_init() call:
* - adjusts musb->mregs
@@ -1958,13 +1961,19 @@ musb_init_controller(struct device *dev, int nIrq, void
__iomem *ctrl)
musb->xceiv->state = OTG_STATE_B_IDLE;
}
- status = musb_host_setup(musb, plat->power);
- if (status < 0)
- goto fail3;
+ if (musb->port_mode == MUSB_PORT_MODE_HOST ||
+ musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE) {
+ status = musb_host_setup(musb, plat->power);
+ if (status < 0)
+ goto fail3;
+ }
- status = musb_gadget_setup(musb);
- if (status < 0)
- goto fail3;
+ if (musb->port_mode == MUSB_PORT_MODE_GADGET ||
+ musb->port_mode == MUSB_PORT_MODE_DUAL_ROLE) {
+ status = musb_gadget_setup(musb);
+ if (status < 0)
+ goto fail3;
+ }
status = musb_init_debugfs(musb);
if (status < 0)
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index ef5b4e6..ed1644f 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -77,6 +77,12 @@ struct musb_ep;
#define is_peripheral_active(m) (!(m)->is_host)
#define is_host_active(m) ((m)->is_host)
+enum {
+ MUSB_PORT_MODE_HOST = 1,
+ MUSB_PORT_MODE_GADGET = 2,
+ MUSB_PORT_MODE_DUAL_ROLE = 3,
+};
+
#ifdef CONFIG_PROC_FS
#include <linux/fs.h>
#define MUSB_CONFIG_PROC_FS
@@ -356,6 +362,7 @@ struct musb {
u8 min_power; /* vbus for periph, in mA/2 */
+ int port_mode; /* MUSB_PORT_MODE_* */
bool is_host;
int a_wait_bcon; /* VBUS timeout in msecs */
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 0414bc1..c606088 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1823,6 +1823,11 @@ static int musb_gadget_start(struct usb_gadget *g,
unsigned long flags;
int retval = 0;
+ if (musb->port_mode == MUSB_PORT_MODE_HOST) {
+ retval = -EINVAL;
+ goto err;
+ }
+
if (driver->max_speed < USB_SPEED_HIGH) {
retval = -EINVAL;
goto err;
--
1.8.1.4
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