mirror of
https://github.com/torvalds/linux.git
synced 2026-06-11 08:03:05 +02:00
usb: otg: Add CPCAP USB OTG driver
This driver receives notifications from cpcap-whisper and emulates the same behavior as when the VBUS and ID USB pins are connected to the app processor. Change-Id: I671e64c58559a2a3036273ef1fe8acb6af516fac Signed-off-by: Benoit Goby <benoit@android.com>
This commit is contained in:
Benoit Goby
Colin Cross
parent
4457175d55
commit
6878c410f2
|
|
@ -67,6 +67,7 @@ config NOP_USB_XCEIV
|
|||
built-in with usb ip or which are autonomous and doesn't require any
|
||||
phy programming such as ISP1x04 etc.
|
||||
|
||||
|
||||
config USB_TEGRA_OTG
|
||||
boolean "Tegra OTG Driver"
|
||||
depends on USB && ARCH_TEGRA
|
||||
|
|
@ -75,4 +76,14 @@ config USB_TEGRA_OTG
|
|||
Enable this driver on boards which use the internal VBUS and ID
|
||||
sensing of the Tegra USB PHY.
|
||||
|
||||
config USB_CPCAP_OTG
|
||||
boolean "Motorola CPCAP OTG Driver"
|
||||
depends on USB && ARCH_TEGRA && MFD_CPCAP
|
||||
select USB_OTG_UTILS
|
||||
help
|
||||
Enable this driver on boards that use the CPCAP sensors for
|
||||
ID and VBUS sensing. The driver receives notifications from
|
||||
cpcap-whisper and emulates the same behavior as when the VBUS
|
||||
and ID pins are connected to the app processor.
|
||||
|
||||
endif # USB || OTG
|
||||
|
|
|
|||
|
|
@ -6,6 +6,7 @@
|
|||
obj-$(CONFIG_USB_OTG_UTILS) += otg.o
|
||||
|
||||
# transceiver drivers
|
||||
obj-$(CONFIG_USB_CPCAP_OTG) += cpcap-otg.o
|
||||
obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o
|
||||
obj-$(CONFIG_USB_TEGRA_OTG) += tegra-otg.o
|
||||
obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
|
||||
|
|
|
|||
286
drivers/usb/otg/cpcap-otg.c
Normal file
286
drivers/usb/otg/cpcap-otg.c
Normal file
|
|
@ -0,0 +1,286 @@
|
|||
/*
|
||||
* Copyright (C) 2010 Google, Inc.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
||||
*/
|
||||
|
||||
#include <linux/usb.h>
|
||||
#include <linux/usb/otg.h>
|
||||
#include <linux/usb/gadget.h>
|
||||
#include <linux/usb/hcd.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/err.h>
|
||||
#include <mach/usb_phy.h>
|
||||
#include <mach/legacy_irq.h>
|
||||
|
||||
#define TEGRA_USB_PHY_WAKEUP_REG_OFFSET 0x408
|
||||
#define TEGRA_VBUS_WAKEUP_SW_VALUE (1 << 12)
|
||||
#define TEGRA_VBUS_WAKEUP_SW_ENABLE (1 << 11)
|
||||
#define TEGRA_ID_SW_VALUE (1 << 4)
|
||||
#define TEGRA_ID_SW_ENABLE (1 << 3)
|
||||
|
||||
struct cpcap_otg_data {
|
||||
struct otg_transceiver otg;
|
||||
struct notifier_block nb;
|
||||
void __iomem *regs;
|
||||
struct clk *clk;
|
||||
int irq;
|
||||
};
|
||||
|
||||
static const char *cpcap_state_name(enum usb_otg_state state)
|
||||
{
|
||||
if (state == OTG_STATE_A_HOST)
|
||||
return "HOST";
|
||||
if (state == OTG_STATE_B_PERIPHERAL)
|
||||
return "PERIPHERAL";
|
||||
if (state == OTG_STATE_A_SUSPEND)
|
||||
return "SUSPEND";
|
||||
return "INVALID";
|
||||
}
|
||||
|
||||
static irqreturn_t cpcap_otg_irq(int irq, void *data)
|
||||
{
|
||||
if (tegra_legacy_force_irq_status(irq))
|
||||
tegra_legacy_force_irq_clr(irq);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int cpcap_otg_notify(struct notifier_block *nb, unsigned long event,
|
||||
void *ignore)
|
||||
{
|
||||
struct cpcap_otg_data *cpcap;
|
||||
struct otg_transceiver *otg;
|
||||
enum usb_otg_state from;
|
||||
enum usb_otg_state to;
|
||||
unsigned long val;
|
||||
struct usb_hcd *hcd;
|
||||
|
||||
cpcap = container_of(nb, struct cpcap_otg_data, nb);
|
||||
otg = &cpcap->otg;
|
||||
|
||||
from = otg->state;
|
||||
if (event == USB_EVENT_VBUS)
|
||||
to = OTG_STATE_B_PERIPHERAL;
|
||||
else if (event == USB_EVENT_ID)
|
||||
to = OTG_STATE_A_HOST;
|
||||
else
|
||||
to = OTG_STATE_A_SUSPEND;
|
||||
|
||||
if (from == to)
|
||||
return 0;
|
||||
otg->state = to;
|
||||
|
||||
dev_info(cpcap->otg.dev, "%s --> %s", cpcap_state_name(from),
|
||||
cpcap_state_name(to));
|
||||
|
||||
if ((to == OTG_STATE_A_HOST) && (from == OTG_STATE_A_SUSPEND)
|
||||
&& otg->host) {
|
||||
hcd = (struct usb_hcd *)otg->host;
|
||||
|
||||
clk_enable(cpcap->clk);
|
||||
|
||||
val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
val &= ~TEGRA_ID_SW_VALUE;
|
||||
writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
|
||||
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
|
||||
|
||||
} else if ((to == OTG_STATE_A_SUSPEND) && (from == OTG_STATE_A_HOST)
|
||||
&& otg->host) {
|
||||
val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
val |= TEGRA_ID_SW_VALUE;
|
||||
writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
|
||||
clk_disable(cpcap->clk);
|
||||
|
||||
} else if ((to == OTG_STATE_B_PERIPHERAL)
|
||||
&& (from == OTG_STATE_A_SUSPEND)
|
||||
&& otg->gadget) {
|
||||
clk_enable(cpcap->clk);
|
||||
|
||||
val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
val |= TEGRA_VBUS_WAKEUP_SW_VALUE;
|
||||
writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
|
||||
} else if ((to == OTG_STATE_A_SUSPEND)
|
||||
&& (from == OTG_STATE_B_PERIPHERAL)
|
||||
&& otg->gadget) {
|
||||
val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
val &= ~TEGRA_VBUS_WAKEUP_SW_VALUE;
|
||||
writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
|
||||
clk_disable(cpcap->clk);
|
||||
} else
|
||||
return 0;
|
||||
|
||||
tegra_legacy_force_irq_set(cpcap->irq);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cpcap_otg_set_peripheral(struct otg_transceiver *otg,
|
||||
struct usb_gadget *gadget)
|
||||
{
|
||||
otg->gadget = gadget;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cpcap_otg_set_host(struct otg_transceiver *otg,
|
||||
struct usb_bus *host)
|
||||
{
|
||||
otg->host = host;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cpcap_otg_set_power(struct otg_transceiver *otg, unsigned mA)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int cpcap_otg_set_suspend(struct otg_transceiver *otg, int suspend)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init cpcap_otg_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct cpcap_otg_data *cpcap;
|
||||
struct resource *res;
|
||||
unsigned long val;
|
||||
int err;
|
||||
|
||||
cpcap = kzalloc(sizeof(struct cpcap_otg_data), GFP_KERNEL);
|
||||
if (!cpcap)
|
||||
return -ENOMEM;
|
||||
|
||||
cpcap->otg.dev = &pdev->dev;
|
||||
cpcap->otg.label = "cpcap-otg";
|
||||
cpcap->otg.state = OTG_STATE_UNDEFINED;
|
||||
cpcap->otg.set_host = cpcap_otg_set_host;
|
||||
cpcap->otg.set_peripheral = cpcap_otg_set_peripheral;
|
||||
cpcap->otg.set_suspend = cpcap_otg_set_suspend;
|
||||
cpcap->otg.set_power = cpcap_otg_set_power;
|
||||
|
||||
platform_set_drvdata(pdev, cpcap);
|
||||
|
||||
cpcap->clk = clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR(cpcap->clk)) {
|
||||
dev_err(&pdev->dev, "Can't get otg clock\n");
|
||||
err = PTR_ERR(cpcap->clk);
|
||||
goto err_clk;
|
||||
}
|
||||
|
||||
err = clk_enable(cpcap->clk);
|
||||
if (err)
|
||||
goto err_clken;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!res) {
|
||||
dev_err(&pdev->dev, "Failed to get I/O memory\n");
|
||||
err = -ENXIO;
|
||||
goto err_io;
|
||||
}
|
||||
cpcap->regs = ioremap(res->start, resource_size(res));
|
||||
if (!cpcap->regs) {
|
||||
err = -ENOMEM;
|
||||
goto err_io;
|
||||
}
|
||||
|
||||
cpcap->irq = platform_get_irq(pdev, 0);
|
||||
if (cpcap->irq < 0) {
|
||||
dev_err(&pdev->dev, "Failed to get IRQ\n");
|
||||
err = -ENXIO;
|
||||
goto err_irq;
|
||||
}
|
||||
|
||||
err = request_irq(cpcap->irq, cpcap_otg_irq, IRQF_SHARED,
|
||||
"cpcap-otg", cpcap);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "cannot request irq %d err %d\n",
|
||||
cpcap->irq, err);
|
||||
goto err_irq;
|
||||
}
|
||||
|
||||
val = readl(cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
val |= TEGRA_VBUS_WAKEUP_SW_ENABLE | TEGRA_ID_SW_ENABLE;
|
||||
val |= TEGRA_ID_SW_VALUE;
|
||||
val &= ~(TEGRA_VBUS_WAKEUP_SW_VALUE);
|
||||
writel(val, cpcap->regs + TEGRA_USB_PHY_WAKEUP_REG_OFFSET);
|
||||
|
||||
clk_disable(cpcap->clk);
|
||||
cpcap->otg.state = OTG_STATE_A_SUSPEND;
|
||||
|
||||
BLOCKING_INIT_NOTIFIER_HEAD(&cpcap->otg.notifier);
|
||||
cpcap->nb.notifier_call = cpcap_otg_notify;
|
||||
otg_register_notifier(&cpcap->otg, &cpcap->nb);
|
||||
|
||||
err = otg_set_transceiver(&cpcap->otg);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "can't register transceiver (%d)\n", err);
|
||||
goto err_otg;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_otg:
|
||||
free_irq(cpcap->irq, cpcap);
|
||||
err_irq:
|
||||
iounmap(cpcap->regs);
|
||||
err_io:
|
||||
clk_disable(cpcap->clk);
|
||||
err_clken:
|
||||
clk_put(cpcap->clk);
|
||||
err_clk:
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
kfree(cpcap);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __exit cpcap_otg_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct cpcap_otg_data *cpcap = platform_get_drvdata(pdev);
|
||||
|
||||
otg_set_transceiver(NULL);
|
||||
free_irq(cpcap->irq, cpcap);
|
||||
iounmap(cpcap->regs);
|
||||
clk_disable(cpcap->clk);
|
||||
clk_put(cpcap->clk);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
kfree(cpcap);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver cpcap_otg_driver = {
|
||||
.driver = {
|
||||
.name = "cpcap-otg",
|
||||
},
|
||||
.remove = __exit_p(cpcap_otg_remove),
|
||||
.probe = cpcap_otg_probe,
|
||||
};
|
||||
|
||||
static int __init cpcap_otg_init(void)
|
||||
{
|
||||
return platform_driver_register(&cpcap_otg_driver);
|
||||
}
|
||||
module_init(cpcap_otg_init);
|
||||
|
||||
static void __exit cpcap_otg_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&cpcap_otg_driver);
|
||||
}
|
||||
module_exit(cpcap_otg_exit);
|
||||
Loading…
Reference in New Issue
Block a user