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HID: i2c-hid: add ACPI support 

The HID over I2C protocol specification states that when the device is
enumerated from ACPI the HID descriptor address can be obtained by
executing "_DSM" for the device with function 1. Enable this.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
hifive-unleashed-5.1
Mika Westerberg 2013-01-09 16:43:08 +02:00 committed by Jiri Kosina
parent fd62c54503
commit 92241e67c0
1 changed files with 81 additions and 6 deletions
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87
drivers/hid/i2c-hid/i2c-hid.c
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@ -34,6 +34,7 @@
#include <linux/kernel.h>
#include <linux/hid.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/i2c/i2c-hid.h>
@ -139,6 +140,8 @@ struct i2c_hid {
unsigned long flags; /* device flags */
wait_queue_head_t wait; /* For waiting the interrupt */
struct i2c_hid_platform_data pdata;
};
static int __i2c_hid_command(struct i2c_client *client,
@ -810,6 +813,70 @@ static int __devinit i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
return 0;
}
#ifdef CONFIG_ACPI
static int i2c_hid_acpi_pdata(struct i2c_client *client,
struct i2c_hid_platform_data *pdata)
{
static u8 i2c_hid_guid[] = {
0xF7, 0xF6, 0xDF, 0x3C, 0x67, 0x42, 0x55, 0x45,
0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE,
};
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object params[4], *obj;
struct acpi_object_list input;
struct acpi_device *adev;
acpi_handle handle;
handle = ACPI_HANDLE(&client->dev);
if (!handle || acpi_bus_get_device(handle, &adev))
return -ENODEV;
input.count = ARRAY_SIZE(params);
input.pointer = params;
params[0].type = ACPI_TYPE_BUFFER;
params[0].buffer.length = sizeof(i2c_hid_guid);
params[0].buffer.pointer = i2c_hid_guid;
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = 1;
params[2].type = ACPI_TYPE_INTEGER;
params[2].integer.value = 1; /* HID function */
params[3].type = ACPI_TYPE_INTEGER;
params[3].integer.value = 0;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf))) {
dev_err(&client->dev, "device _DSM execution failed\n");
return -ENODEV;
}
obj = (union acpi_object *)buf.pointer;
if (obj->type != ACPI_TYPE_INTEGER) {
dev_err(&client->dev, "device _DSM returned invalid type: %d\n",
obj->type);
kfree(buf.pointer);
return -EINVAL;
}
pdata->hid_descriptor_address = obj->integer.value;
kfree(buf.pointer);
return 0;
}
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;
}
#endif
static int __devinit i2c_hid_probe(struct i2c_client *client,
const struct i2c_device_id *dev_id)
{
@ -821,11 +888,6 @@ static int __devinit i2c_hid_probe(struct i2c_client *client,
dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
if (!platform_data) {
dev_err(&client->dev, "HID register address not provided\n");
return -EINVAL;
}
if (!client->irq) {
dev_err(&client->dev,
"HID over i2c has not been provided an Int IRQ\n");
@ -836,11 +898,22 @@ static int __devinit i2c_hid_probe(struct i2c_client *client,
if (!ihid)
return -ENOMEM;
if (!platform_data) {
ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
if (ret) {
dev_err(&client->dev,
"HID register address not provided\n");
goto err;
}
} else {
ihid->pdata = *platform_data;
}
i2c_set_clientdata(client, ihid);
ihid->client = client;
hidRegister = platform_data->hid_descriptor_address;
hidRegister = ihid->pdata.hid_descriptor_address;
ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
init_waitqueue_head(&ihid->wait);
@ -873,6 +946,7 @@ static int __devinit i2c_hid_probe(struct i2c_client *client,
hid->hid_get_raw_report = i2c_hid_get_raw_report;
hid->hid_output_raw_report = i2c_hid_output_raw_report;
hid->dev.parent = &client->dev;
ACPI_HANDLE_SET(&hid->dev, ACPI_HANDLE(&client->dev));
hid->bus = BUS_I2C;
hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
@ -964,6 +1038,7 @@ static struct i2c_driver i2c_hid_driver = {
.name = "i2c_hid",
.owner = THIS_MODULE,
.pm = &i2c_hid_pm,
.acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
},
.probe = i2c_hid_probe,