diff options
Diffstat (limited to 'drivers/hid/i2c-hid')
| -rw-r--r-- | drivers/hid/i2c-hid/i2c-hid.c | 87 |
1 files changed, 81 insertions, 6 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index e766b5614ef5..ec7930217a6d 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -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, @@ -821,6 +824,70 @@ static int 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 i2c_hid_probe(struct i2c_client *client, const struct i2c_device_id *dev_id) { @@ -832,11 +899,6 @@ static int 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"); @@ -847,11 +909,22 @@ static int 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); @@ -884,6 +957,7 @@ static int 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); @@ -975,6 +1049,7 @@ 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, |