diff options
Diffstat (limited to 'drivers/misc/mei/nfc.c')
| -rw-r--r-- | drivers/misc/mei/nfc.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/misc/mei/nfc.c b/drivers/misc/mei/nfc.c new file mode 100644 index 000000000000..37d4b09bc795 --- /dev/null +++ b/drivers/misc/mei/nfc.c @@ -0,0 +1,311 @@ +/* + * + * Intel Management Engine Interface (Intel MEI) Linux driver + * Copyright (c) 2003-2013, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + * + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/pci.h> +#include <linux/mei_cl_bus.h> + +#include "mei_dev.h" +#include "client.h" + +struct mei_nfc_cmd { + u8 command; + u8 status; + u16 req_id; + u32 reserved; + u16 data_size; + u8 sub_command; + u8 data[]; +} __packed; + +struct mei_nfc_reply { + u8 command; + u8 status; + u16 req_id; + u32 reserved; + u16 data_size; + u8 sub_command; + u8 reply_status; + u8 data[]; +} __packed; + +struct mei_nfc_if_version { + u8 radio_version_sw[3]; + u8 reserved[3]; + u8 radio_version_hw[3]; + u8 i2c_addr; + u8 fw_ivn; + u8 vendor_id; + u8 radio_type; +} __packed; + +struct mei_nfc_connect { + u8 fw_ivn; + u8 vendor_id; +} __packed; + +struct mei_nfc_connect_resp { + u8 fw_ivn; + u8 vendor_id; + u16 me_major; + u16 me_minor; + u16 me_hotfix; + u16 me_build; +} __packed; + +struct mei_nfc_hci_hdr { + u8 cmd; + u8 status; + u16 req_id; + u32 reserved; + u16 data_size; +} __packed; + +#define MEI_NFC_CMD_MAINTENANCE 0x00 +#define MEI_NFC_CMD_HCI_SEND 0x01 +#define MEI_NFC_CMD_HCI_RECV 0x02 + +#define MEI_NFC_SUBCMD_CONNECT 0x00 +#define MEI_NFC_SUBCMD_IF_VERSION 0x01 + +#define MEI_NFC_HEADER_SIZE 10 + +/** mei_nfc_dev - NFC mei device + * + * @cl: NFC host client + * @cl_info: NFC info host client + * @init_work: perform connection to the info client + * @fw_ivn: NFC Intervace Version Number + * @vendor_id: NFC manufacturer ID + * @radio_type: NFC radio type + */ +struct mei_nfc_dev { + struct mei_cl *cl; + struct mei_cl *cl_info; + struct work_struct init_work; + u8 fw_ivn; + u8 vendor_id; + u8 radio_type; +}; + +static struct mei_nfc_dev nfc_dev; + +/* UUIDs for NFC F/W clients */ +const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50, + 0x94, 0xd4, 0x50, 0x26, + 0x67, 0x23, 0x77, 0x5c); + +static const uuid_le mei_nfc_info_guid = UUID_LE(0xd2de1625, 0x382d, 0x417d, + 0x48, 0xa4, 0xef, 0xab, + 0xba, 0x8a, 0x12, 0x06); + +static void mei_nfc_free(struct mei_nfc_dev *ndev) +{ + if (ndev->cl) { + list_del(&ndev->cl->device_link); + mei_cl_unlink(ndev->cl); + kfree(ndev->cl); + } + + if (ndev->cl_info) { + list_del(&ndev->cl_info->device_link); + mei_cl_unlink(ndev->cl_info); + kfree(ndev->cl_info); + } +} + +static int mei_nfc_if_version(struct mei_nfc_dev *ndev) +{ + struct mei_device *dev; + struct mei_cl *cl; + + struct mei_nfc_cmd cmd; + struct mei_nfc_reply *reply = NULL; + struct mei_nfc_if_version *version; + size_t if_version_length; + int bytes_recv, ret; + + cl = ndev->cl_info; + dev = cl->dev; + + memset(&cmd, 0, sizeof(struct mei_nfc_cmd)); + cmd.command = MEI_NFC_CMD_MAINTENANCE; + cmd.data_size = 1; + cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION; + + ret = __mei_cl_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd)); + if (ret < 0) { + dev_err(&dev->pdev->dev, "Could not send IF version cmd\n"); + return ret; + } + + /* to be sure on the stack we alloc memory */ + if_version_length = sizeof(struct mei_nfc_reply) + + sizeof(struct mei_nfc_if_version); + + reply = kzalloc(if_version_length, GFP_KERNEL); + if (!reply) + return -ENOMEM; + + bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length); + if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) { + dev_err(&dev->pdev->dev, "Could not read IF version\n"); + ret = -EIO; + goto err; + } + + version = (struct mei_nfc_if_version *)reply->data; + + ndev->fw_ivn = version->fw_ivn; + ndev->vendor_id = version->vendor_id; + ndev->radio_type = version->radio_type; + +err: + kfree(reply); + return ret; +} + +static void mei_nfc_init(struct work_struct *work) +{ + struct mei_device *dev; + struct mei_nfc_dev *ndev; + struct mei_cl *cl_info; + + ndev = container_of(work, struct mei_nfc_dev, init_work); + + cl_info = ndev->cl_info; + dev = cl_info->dev; + + mutex_lock(&dev->device_lock); + + if (mei_cl_connect(cl_info, NULL) < 0) { + mutex_unlock(&dev->device_lock); + dev_err(&dev->pdev->dev, + "Could not connect to the NFC INFO ME client"); + + goto err; + } + + mutex_unlock(&dev->device_lock); + + if (mei_nfc_if_version(ndev) < 0) { + dev_err(&dev->pdev->dev, "Could not get the NFC interfave version"); + + goto err; + } + + dev_info(&dev->pdev->dev, + "NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n", + ndev->fw_ivn, ndev->vendor_id, ndev->radio_type); + + mutex_lock(&dev->device_lock); + + if (mei_cl_disconnect(cl_info) < 0) { + mutex_unlock(&dev->device_lock); + dev_err(&dev->pdev->dev, + "Could not disconnect the NFC INFO ME client"); + + goto err; + } + + mutex_unlock(&dev->device_lock); + + return; + +err: + mei_nfc_free(ndev); + + return; +} + + +int mei_nfc_host_init(struct mei_device *dev) +{ + struct mei_nfc_dev *ndev = &nfc_dev; + struct mei_cl *cl_info, *cl = NULL; + int i, ret; + + /* already initialzed */ + if (ndev->cl_info) + return 0; + + cl_info = mei_cl_allocate(dev); + cl = mei_cl_allocate(dev); + + if (!cl || !cl_info) { + ret = -ENOMEM; + goto err; + } + + /* check for valid client id */ + i = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid); + if (i < 0) { + dev_info(&dev->pdev->dev, "nfc: failed to find the client\n"); + ret = -ENOENT; + goto err; + } + + cl_info->me_client_id = dev->me_clients[i].client_id; + + ret = mei_cl_link(cl_info, MEI_HOST_CLIENT_ID_ANY); + if (ret) + goto err; + + cl_info->device_uuid = mei_nfc_info_guid; + + list_add_tail(&cl_info->device_link, &dev->device_list); + + /* check for valid client id */ + i = mei_me_cl_by_uuid(dev, &mei_nfc_guid); + if (i < 0) { + dev_info(&dev->pdev->dev, "nfc: failed to find the client\n"); + ret = -ENOENT; + goto err; + } + + cl->me_client_id = dev->me_clients[i].client_id; + + ret = mei_cl_link(cl, MEI_HOST_CLIENT_ID_ANY); + if (ret) + goto err; + + cl->device_uuid = mei_nfc_guid; + + list_add_tail(&cl->device_link, &dev->device_list); + + ndev->cl_info = cl_info; + ndev->cl = cl; + + INIT_WORK(&ndev->init_work, mei_nfc_init); + schedule_work(&ndev->init_work); + + return 0; + +err: + mei_nfc_free(ndev); + + return ret; +} + +void mei_nfc_host_exit(void) +{ + struct mei_nfc_dev *ndev = &nfc_dev; + + mei_nfc_free(ndev); +} |