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HID: i2c-hid: Reorganize so ACPI and OF are separate modules

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This patch rejiggers the i2c-hid code so that the OF (Open Firmware
aka Device Tree) and ACPI support is separated out a bit.  The OF and
ACPI drivers are now separate modules that wrap the core module.

Essentially, what we're doing here:
* Make "power up" and "power down" a function that can be (optionally)
  implemented by a given user of the i2c-hid core.
* The OF and ACPI modules are drivers on their own, so they implement
  probe / remove / suspend / resume / shutdown.  The core code
  provides implementations that OF and ACPI can call into.

We'll organize this so that we now have 3 modules: the old i2c-hid
module becomes the "core" module and two new modules will depend on
it, handling probing the specific device.

As part of this work, we'll remove the i2c-hid "platform data"
concept since it's not needed.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
This commit is contained in:
Douglas Anderson 2021-01-15 09:06:37 -08:00 committed by Benjamin Tissoires
parent 2bbe17ae87
commit b33752c300
8 changed files with 380 additions and 262 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/hid/Makefile
View File

@ -138,7 +138,7 @@ obj-$(CONFIG_USB_HID) += usbhid/
obj-$(CONFIG_USB_MOUSE) += usbhid/
obj-$(CONFIG_USB_KBD) += usbhid/
obj-$(CONFIG_I2C_HID) += i2c-hid/
obj-$(CONFIG_I2C_HID_CORE) += i2c-hid/
obj-$(CONFIG_INTEL_ISH_HID) += intel-ish-hid/
obj-$(INTEL_ISH_FIRMWARE_DOWNLOADER) += intel-ish-hid/

32
drivers/hid/i2c-hid/Kconfig
View File

@ -2,18 +2,40 @@
menu "I2C HID support"
depends on I2C
config I2C_HID
tristate "HID over I2C transport layer"
config I2C_HID_ACPI
tristate "HID over I2C transport layer ACPI driver"
default n
depends on I2C && INPUT
select HID
depends on I2C && INPUT && ACPI
help
Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
other HID based devices which is connected to your computer via I2C.
This driver supports ACPI-based systems.
If unsure, say N.
This support is also available as a module. If so, the module
will be called i2c-hid.
will be called i2c-hid-acpi. It will also build/depend on the
module i2c-hid.
config I2C_HID_OF
tristate "HID over I2C transport layer Open Firmware driver"
default n
depends on I2C && INPUT && OF
help
Say Y here if you use a keyboard, a touchpad, a touchscreen, or any
other HID based devices which is connected to your computer via I2C.
This driver supports Open Firmware (Device Tree)-based systems.
If unsure, say N.
This support is also available as a module. If so, the module
will be called i2c-hid-of. It will also build/depend on the
module i2c-hid.
endmenu
config I2C_HID_CORE
tristate
default y if I2C_HID_ACPI=y || I2C_HID_OF=y
default m if I2C_HID_ACPI=m || I2C_HID_OF=m
select HID

5
drivers/hid/i2c-hid/Makefile
View File

@ -3,7 +3,10 @@
# Makefile for the I2C input drivers
#
obj-$(CONFIG_I2C_HID) += i2c-hid.o
obj-$(CONFIG_I2C_HID_CORE) += i2c-hid.o
i2c-hid-objs = i2c-hid-core.o
i2c-hid-$(CONFIG_DMI) += i2c-hid-dmi-quirks.o
obj-$(CONFIG_I2C_HID_ACPI) += i2c-hid-acpi.o
obj-$(CONFIG_I2C_HID_OF) += i2c-hid-of.o

143
drivers/hid/i2c-hid/i2c-hid-acpi.c Normal file
View File

@ -0,0 +1,143 @@
/*
* HID over I2C ACPI Subclass
*
* Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
* Copyright (c) 2012 Red Hat, Inc
*
* This code was forked out of the core code, which was partly based on
* "USB HID support for Linux":
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
* Copyright (c) 2007-2008 Oliver Neukum
* Copyright (c) 2006-2010 Jiri Kosina
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm.h>
#include "i2c-hid.h"
struct i2c_hid_acpi {
struct i2chid_ops ops;
struct i2c_client *client;
};
static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
/*
* The CHPN0001 ACPI device, which is used to describe the Chipone
* ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
*/
{"CHPN0001", 0 },
{ },
};
static int i2c_hid_acpi_get_descriptor(struct i2c_client *client)
{
static guid_t i2c_hid_guid =
GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
union acpi_object *obj;
struct acpi_device *adev;
acpi_handle handle;
u16 hid_descriptor_address;
handle = ACPI_HANDLE(&client->dev);
if (!handle || acpi_bus_get_device(handle, &adev)) {
dev_err(&client->dev, "Error could not get ACPI device\n");
return -ENODEV;
}
if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
return -ENODEV;
obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
ACPI_TYPE_INTEGER);
if (!obj) {
dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
return -ENODEV;
}
hid_descriptor_address = obj->integer.value;
ACPI_FREE(obj);
return hid_descriptor_address;
}
static void i2c_hid_acpi_shutdown_tail(struct i2chid_ops *ops)
{
struct i2c_hid_acpi *ihid_acpi =
container_of(ops, struct i2c_hid_acpi, ops);
struct device *dev = &ihid_acpi->client->dev;
acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D3_COLD);
}
static int i2c_hid_acpi_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
struct device *dev = &client->dev;
struct i2c_hid_acpi *ihid_acpi;
struct acpi_device *adev;
u16 hid_descriptor_address;
int ret;
ihid_acpi = devm_kzalloc(&client->dev, sizeof(*ihid_acpi), GFP_KERNEL);
if (!ihid_acpi)
return -ENOMEM;
ihid_acpi->client = client;
ihid_acpi->ops.shutdown_tail = i2c_hid_acpi_shutdown_tail;
ret = i2c_hid_acpi_get_descriptor(client);
if (ret < 0)
return ret;
hid_descriptor_address = ret;
adev = ACPI_COMPANION(dev);
if (adev)
acpi_device_fix_up_power(adev);
if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
device_set_wakeup_capable(dev, true);
device_set_wakeup_enable(dev, false);
}
return i2c_hid_core_probe(client, &ihid_acpi->ops,
hid_descriptor_address);
}
static const struct acpi_device_id i2c_hid_acpi_match[] = {
{"ACPI0C50", 0 },
{"PNP0C50", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
static struct i2c_driver i2c_hid_acpi_driver = {
.driver = {
.name = "i2c_hid_acpi",
.pm = &i2c_hid_core_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
},
.probe = i2c_hid_acpi_probe,
.remove = i2c_hid_core_remove,
.shutdown = i2c_hid_core_shutdown,
};
module_i2c_driver(i2c_hid_acpi_driver);
MODULE_DESCRIPTION("HID over I2C ACPI driver");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_LICENSE("GPL");

254
drivers/hid/i2c-hid/i2c-hid-core.c
View File

@ -35,11 +35,6 @@
#include <linux/kernel.h>
#include <linux/hid.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/platform_data/i2c-hid.h>
#include "../hid-ids.h"
#include "i2c-hid.h"
@ -156,10 +151,10 @@ struct i2c_hid {
wait_queue_head_t wait; /* For waiting the interrupt */
struct i2c_hid_platform_data pdata;
bool irq_wake_enabled;
struct mutex reset_lock;
struct i2chid_ops *ops;
};
static const struct i2c_hid_quirks {
@ -884,144 +879,36 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
return 0;
}
#ifdef CONFIG_ACPI
static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
/*
* The CHPN0001 ACPI device, which is used to describe the Chipone
* ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
*/
{"CHPN0001", 0 },
{ },
};
static int i2c_hid_acpi_pdata(struct i2c_client *client,
struct i2c_hid_platform_data *pdata)
static int i2c_hid_core_power_up(struct i2c_hid *ihid)
{
static guid_t i2c_hid_guid =
GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
union acpi_object *obj;
struct acpi_device *adev;
acpi_handle handle;
if (!ihid->ops->power_up)
return 0;
handle = ACPI_HANDLE(&client->dev);
if (!handle || acpi_bus_get_device(handle, &adev)) {
dev_err(&client->dev, "Error could not get ACPI device\n");
return -ENODEV;
}
if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
return -ENODEV;
obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
ACPI_TYPE_INTEGER);
if (!obj) {
dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
return -ENODEV;
}
pdata->hid_descriptor_address = obj->integer.value;
ACPI_FREE(obj);
return 0;
return ihid->ops->power_up(ihid->ops);
}
static void i2c_hid_acpi_fix_up_power(struct device *dev)
static void i2c_hid_core_power_down(struct i2c_hid *ihid)
{
struct acpi_device *adev;
if (!ihid->ops->power_down)
return;
adev = ACPI_COMPANION(dev);
if (adev)
acpi_device_fix_up_power(adev);
ihid->ops->power_down(ihid->ops);
}
static void i2c_hid_acpi_enable_wakeup(struct device *dev)
static void i2c_hid_core_shutdown_tail(struct i2c_hid *ihid)
{
if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
device_set_wakeup_capable(dev, true);
device_set_wakeup_enable(dev, false);
}
if (!ihid->ops->shutdown_tail)
return;
ihid->ops->shutdown_tail(ihid->ops);
}
static void i2c_hid_acpi_shutdown(struct device *dev)
{
acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D3_COLD);
}
static const struct acpi_device_id i2c_hid_acpi_match[] = {
{"ACPI0C50", 0 },
{"PNP0C50", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
#else
static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
struct i2c_hid_platform_data *pdata)
{
return -ENODEV;
}
static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
static inline void i2c_hid_acpi_enable_wakeup(struct device *dev) {}
static inline void i2c_hid_acpi_shutdown(struct device *dev) {}
#endif
#ifdef CONFIG_OF
static int i2c_hid_of_probe(struct i2c_client *client,
struct i2c_hid_platform_data *pdata)
{
struct device *dev = &client->dev;
u32 val;
int ret;
ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
if (ret) {
dev_err(&client->dev, "HID register address not provided\n");
return -ENODEV;
}
if (val >> 16) {
dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
val);
return -EINVAL;
}
pdata->hid_descriptor_address = val;
return 0;
}
static const struct of_device_id i2c_hid_of_match[] = {
{ .compatible = "hid-over-i2c" },
{},
};
MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
#else
static inline int i2c_hid_of_probe(struct i2c_client *client,
struct i2c_hid_platform_data *pdata)
{
return -ENODEV;
}
#endif
static void i2c_hid_fwnode_probe(struct i2c_client *client,
struct i2c_hid_platform_data *pdata)
{
u32 val;
if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
&val))
pdata->post_power_delay_ms = val;
}
static int i2c_hid_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
u16 hid_descriptor_address)
{
int ret;
struct i2c_hid *ihid;
struct hid_device *hid;
__u16 hidRegister;
struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
@ -1042,44 +929,17 @@ static int i2c_hid_probe(struct i2c_client *client,
if (!ihid)
return -ENOMEM;
if (client->dev.of_node) {
ret = i2c_hid_of_probe(client, &ihid->pdata);
if (ret)
return ret;
} else if (!platform_data) {
ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
if (ret)
return ret;
} else {
ihid->pdata = *platform_data;
}
ihid->ops = ops;
/* Parse platform agnostic common properties from ACPI / device tree */
i2c_hid_fwnode_probe(client, &ihid->pdata);
ihid->pdata.supplies[0].supply = "vdd";
ihid->pdata.supplies[1].supply = "vddl";
ret = devm_regulator_bulk_get(&client->dev,
ARRAY_SIZE(ihid->pdata.supplies),
ihid->pdata.supplies);
ret = i2c_hid_core_power_up(ihid);
if (ret)
return ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
ihid->pdata.supplies);
if (ret < 0)
return ret;
if (ihid->pdata.post_power_delay_ms)
msleep(ihid->pdata.post_power_delay_ms);
i2c_set_clientdata(client, ihid);
ihid->client = client;
hidRegister = ihid->pdata.hid_descriptor_address;
ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
ihid->wHIDDescRegister = cpu_to_le16(hid_descriptor_address);
init_waitqueue_head(&ihid->wait);
mutex_init(&ihid->reset_lock);
@ -1089,11 +949,7 @@ static int i2c_hid_probe(struct i2c_client *client,
* real computation later. */
ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
if (ret < 0)
goto err_regulator;
i2c_hid_acpi_fix_up_power(&client->dev);
i2c_hid_acpi_enable_wakeup(&client->dev);
goto err_powered;
device_enable_async_suspend(&client->dev);
@ -1102,19 +958,19 @@ static int i2c_hid_probe(struct i2c_client *client,
if (ret < 0) {
dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
ret = -ENXIO;
goto err_regulator;
goto err_powered;
}
ret = i2c_hid_fetch_hid_descriptor(ihid);
if (ret < 0) {
dev_err(&client->dev,
"Failed to fetch the HID Descriptor\n");
goto err_regulator;
goto err_powered;
}
ret = i2c_hid_init_irq(client);
if (ret < 0)
goto err_regulator;
goto err_powered;
hid = hid_allocate_device();
if (IS_ERR(hid)) {
@ -1153,14 +1009,14 @@ err_mem_free:
err_irq:
free_irq(client->irq, ihid);
err_regulator:
regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
ihid->pdata.supplies);
err_powered:
i2c_hid_core_power_down(ihid);
i2c_hid_free_buffers(ihid);
return ret;
}
EXPORT_SYMBOL_GPL(i2c_hid_core_probe);
static int i2c_hid_remove(struct i2c_client *client)
int i2c_hid_core_remove(struct i2c_client *client)
{
struct i2c_hid *ihid = i2c_get_clientdata(client);
struct hid_device *hid;
@ -1173,24 +1029,25 @@ static int i2c_hid_remove(struct i2c_client *client)
if (ihid->bufsize)
i2c_hid_free_buffers(ihid);
regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
ihid->pdata.supplies);
i2c_hid_core_power_down(ihid);
return 0;
}
EXPORT_SYMBOL_GPL(i2c_hid_core_remove);
static void i2c_hid_shutdown(struct i2c_client *client)
void i2c_hid_core_shutdown(struct i2c_client *client)
{
struct i2c_hid *ihid = i2c_get_clientdata(client);
i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
free_irq(client->irq, ihid);
i2c_hid_acpi_shutdown(&client->dev);
i2c_hid_core_shutdown_tail(ihid);
}
EXPORT_SYMBOL_GPL(i2c_hid_core_shutdown);
#ifdef CONFIG_PM_SLEEP
static int i2c_hid_suspend(struct device *dev)
static int i2c_hid_core_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct i2c_hid *ihid = i2c_get_clientdata(client);
@ -1217,14 +1074,13 @@ static int i2c_hid_suspend(struct device *dev)
hid_warn(hid, "Failed to enable irq wake: %d\n",
wake_status);
} else {
regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
ihid->pdata.supplies);
i2c_hid_core_power_down(ihid);
}
return 0;
}
static int i2c_hid_resume(struct device *dev)
static int i2c_hid_core_resume(struct device *dev)
{
int ret;
struct i2c_client *client = to_i2c_client(dev);
@ -1233,13 +1089,7 @@ static int i2c_hid_resume(struct device *dev)
int wake_status;
if (!device_may_wakeup(&client->dev)) {
ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
ihid->pdata.supplies);
if (ret)
hid_warn(hid, "Failed to enable supplies: %d\n", ret);
if (ihid->pdata.post_power_delay_ms)
msleep(ihid->pdata.post_power_delay_ms);
i2c_hid_core_power_up(ihid);
} else if (ihid->irq_wake_enabled) {
wake_status = disable_irq_wake(client->irq);
if (!wake_status)
@ -1276,34 +1126,10 @@ static int i2c_hid_resume(struct device *dev)
}
#endif
static const struct dev_pm_ops i2c_hid_pm = {
SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
const struct dev_pm_ops i2c_hid_core_pm = {
SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_core_suspend, i2c_hid_core_resume)
};
static const struct i2c_device_id i2c_hid_id_table[] = {
{ "hid", 0 },
{ "hid-over-i2c", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
static struct i2c_driver i2c_hid_driver = {
.driver = {
.name = "i2c_hid",
.pm = &i2c_hid_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
.of_match_table = of_match_ptr(i2c_hid_of_match),
},
.probe = i2c_hid_probe,
.remove = i2c_hid_remove,
.shutdown = i2c_hid_shutdown,
.id_table = i2c_hid_id_table,
};
module_i2c_driver(i2c_hid_driver);
EXPORT_SYMBOL_GPL(i2c_hid_core_pm);
MODULE_DESCRIPTION("HID over I2C core driver");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");

143
drivers/hid/i2c-hid/i2c-hid-of.c Normal file
View File

@ -0,0 +1,143 @@
/*
* HID over I2C Open Firmware Subclass
*
* Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
* Copyright (c) 2012 Red Hat, Inc
*
* This code was forked out of the core code, which was partly based on
* "USB HID support for Linux":
*
* Copyright (c) 1999 Andreas Gal
* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
* Copyright (c) 2007-2008 Oliver Neukum
* Copyright (c) 2006-2010 Jiri Kosina
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#include "i2c-hid.h"
struct i2c_hid_of {
struct i2chid_ops ops;
struct i2c_client *client;
struct regulator_bulk_data supplies[2];
int post_power_delay_ms;
};
static int i2c_hid_of_power_up(struct i2chid_ops *ops)
{
struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
struct device *dev = &ihid_of->client->dev;
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
if (ret) {
dev_warn(dev, "Failed to enable supplies: %d\n", ret);
return ret;
}
if (ihid_of->post_power_delay_ms)
msleep(ihid_of->post_power_delay_ms);
return 0;
}
static void i2c_hid_of_power_down(struct i2chid_ops *ops)
{
struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
}
static int i2c_hid_of_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
struct device *dev = &client->dev;
struct i2c_hid_of *ihid_of;
u16 hid_descriptor_address;
int ret;
u32 val;
ihid_of = devm_kzalloc(&client->dev, sizeof(*ihid_of), GFP_KERNEL);
if (!ihid_of)
return -ENOMEM;
ihid_of->ops.power_up = i2c_hid_of_power_up;
ihid_of->ops.power_down = i2c_hid_of_power_down;
ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
if (ret) {
dev_err(&client->dev, "HID register address not provided\n");
return -ENODEV;
}
if (val >> 16) {
dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
val);
return -EINVAL;
}
hid_descriptor_address = val;
if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
&val))
ihid_of->post_power_delay_ms = val;
ihid_of->supplies[0].supply = "vdd";
ihid_of->supplies[1].supply = "vddl";
ret = devm_regulator_bulk_get(&client->dev,
ARRAY_SIZE(ihid_of->supplies),
ihid_of->supplies);
if (ret)
return ret;
return i2c_hid_core_probe(client, &ihid_of->ops,
hid_descriptor_address);
}
static const struct of_device_id i2c_hid_of_match[] = {
{ .compatible = "hid-over-i2c" },
{},
};
MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
static const struct i2c_device_id i2c_hid_of_id_table[] = {
{ "hid", 0 },
{ "hid-over-i2c", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, i2c_hid_of_id_table);
static struct i2c_driver i2c_hid_of_driver = {
.driver = {
.name = "i2c_hid_of",
.pm = &i2c_hid_core_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = of_match_ptr(i2c_hid_of_match),
},
.probe = i2c_hid_of_probe,
.remove = i2c_hid_core_remove,
.shutdown = i2c_hid_core_shutdown,
.id_table = i2c_hid_of_id_table,
};
module_i2c_driver(i2c_hid_of_driver);
MODULE_DESCRIPTION("HID over I2C OF driver");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_LICENSE("GPL");

22
drivers/hid/i2c-hid/i2c-hid.h
View File

@ -3,6 +3,7 @@
#ifndef I2C_HID_H
#define I2C_HID_H
#include <linux/i2c.h>
#ifdef CONFIG_DMI
struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name);
@ -17,4 +18,25 @@ static inline char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
{ return NULL; }
#endif
/**
* struct i2chid_ops - Ops provided to the core.
*
* @power_up: do sequencing to power up the device.
* @power_down: do sequencing to power down the device.
* @shutdown_tail: called at the end of shutdown.
*/
struct i2chid_ops {
int (*power_up)(struct i2chid_ops *ops);
void (*power_down)(struct i2chid_ops *ops);
void (*shutdown_tail)(struct i2chid_ops *ops);
};
int i2c_hid_core_probe(struct i2c_client *client, struct i2chid_ops *ops,
u16 hid_descriptor_address);
int i2c_hid_core_remove(struct i2c_client *client);
void i2c_hid_core_shutdown(struct i2c_client *client);
extern const struct dev_pm_ops i2c_hid_core_pm;
#endif

41
include/linux/platform_data/i2c-hid.h
View File

@ -1,41 +0,0 @@
/*
* HID over I2C protocol implementation
*
* Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#ifndef __LINUX_I2C_HID_H
#define __LINUX_I2C_HID_H
#include <linux/regulator/consumer.h>
#include <linux/types.h>
/**
* struct i2chid_platform_data - used by hid over i2c implementation.
* @hid_descriptor_address: i2c register where the HID descriptor is stored.
* @supplies: regulators for powering on the device.
* @post_power_delay_ms: delay after powering on before device is usable.
*
* Note that it is the responsibility of the platform driver (or the acpi 5.0
* driver, or the flattened device tree) to setup the irq related to the gpio in
* the struct i2c_board_info.
* The platform driver should also setup the gpio according to the device:
*
* A typical example is the following:
* irq = gpio_to_irq(intr_gpio);
* hkdk4412_i2c_devs5[0].irq = irq; // store the irq in i2c_board_info
* gpio_request(intr_gpio, "elan-irq");
* s3c_gpio_setpull(intr_gpio, S3C_GPIO_PULL_UP);
*/
struct i2c_hid_platform_data {
u16 hid_descriptor_address;
struct regulator_bulk_data supplies[2];
int post_power_delay_ms;
};
#endif /* __LINUX_I2C_HID_H */