--- /dev/null
+/*
+ * Microchip / Atmel ECC (I2C) driver.
+ *
+ * Copyright (c) 2017, Microchip Technology Inc.
+ * Author: Tudor Ambarus <tudor.ambarus@microchip.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/bitrev.h>
+#include <linux/crc16.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <crypto/internal/kpp.h>
+#include <crypto/ecdh.h>
+#include <crypto/kpp.h>
+#include "atmel-ecc.h"
+
+/* Used for binding tfm objects to i2c clients. */
+struct atmel_ecc_driver_data {
+ struct list_head i2c_client_list;
+ spinlock_t i2c_list_lock;
+} ____cacheline_aligned;
+
+static struct atmel_ecc_driver_data driver_data;
+
+/**
+ * atmel_ecc_i2c_client_priv - i2c_client private data
+ * @client : pointer to i2c client device
+ * @i2c_client_list_node: part of i2c_client_list
+ * @lock : lock for sending i2c commands
+ * @wake_token : wake token array of zeros
+ * @wake_token_sz : size in bytes of the wake_token
+ * @tfm_count : number of active crypto transformations on i2c client
+ *
+ * Reads and writes from/to the i2c client are sequential. The first byte
+ * transmitted to the device is treated as the byte size. Any attempt to send
+ * more than this number of bytes will cause the device to not ACK those bytes.
+ * After the host writes a single command byte to the input buffer, reads are
+ * prohibited until after the device completes command execution. Use a mutex
+ * when sending i2c commands.
+ */
+struct atmel_ecc_i2c_client_priv {
+ struct i2c_client *client;
+ struct list_head i2c_client_list_node;
+ struct mutex lock;
+ u8 wake_token[WAKE_TOKEN_MAX_SIZE];
+ size_t wake_token_sz;
+ atomic_t tfm_count ____cacheline_aligned;
+};
+
+/**
+ * atmel_ecdh_ctx - transformation context
+ * @client : pointer to i2c client device
+ * @fallback : used for unsupported curves or when user wants to use its own
+ * private key.
+ * @public_key : generated when calling set_secret(). It's the responsibility
+ * of the user to not call set_secret() while
+ * generate_public_key() or compute_shared_secret() are in flight.
+ * @curve_id : elliptic curve id
+ * @n_sz : size in bytes of the n prime
+ * @do_fallback: true when the device doesn't support the curve or when the user
+ * wants to use its own private key.
+ */
+struct atmel_ecdh_ctx {
+ struct i2c_client *client;
+ struct crypto_kpp *fallback;
+ const u8 *public_key;
+ unsigned int curve_id;
+ size_t n_sz;
+ bool do_fallback;
+};
+
+/**
+ * atmel_ecc_work_data - data structure representing the work
+ * @ctx : transformation context.
+ * @cbk : pointer to a callback function to be invoked upon completion of this
+ * request. This has the form:
+ * callback(struct atmel_ecc_work_data *work_data, void *areq, u8 status)
+ * where:
+ * @work_data: data structure representing the work
+ * @areq : optional pointer to an argument passed with the original
+ * request.
+ * @status : status returned from the device.
+ * @areq: optional pointer to a user argument for use at callback time.
+ * @work: describes the task to be executed.
+ * @cmd : structure used for communicating with the device.
+ */
+struct atmel_ecc_work_data {
+ struct atmel_ecdh_ctx *ctx;
+ void (*cbk)(struct atmel_ecc_work_data *work_data, void *areq,
+ u8 status);
+ void *areq;
+ struct work_struct work;
+ struct atmel_ecc_cmd cmd;
+};
+
+static u16 atmel_ecc_crc16(u16 crc, const u8 *buffer, size_t len)
+{
+ return cpu_to_le16(bitrev16(crc16(crc, buffer, len)));
+}
+
+/**
+ * atmel_ecc_checksum() - Generate 16-bit CRC as required by ATMEL ECC.
+ * CRC16 verification of the count, opcode, param1, param2 and data bytes.
+ * The checksum is saved in little-endian format in the least significant
+ * two bytes of the command. CRC polynomial is 0x8005 and the initial register
+ * value should be zero.
+ *
+ * @cmd : structure used for communicating with the device.
+ */
+static void atmel_ecc_checksum(struct atmel_ecc_cmd *cmd)
+{
+ u8 *data = &cmd->count;
+ size_t len = cmd->count - CRC_SIZE;
+ u16 *crc16 = (u16 *)(data + len);
+
+ *crc16 = atmel_ecc_crc16(0, data, len);
+}
+
+static void atmel_ecc_init_read_cmd(struct atmel_ecc_cmd *cmd)
+{
+ cmd->word_addr = COMMAND;
+ cmd->opcode = OPCODE_READ;
+ /*
+ * Read the word from Configuration zone that contains the lock bytes
+ * (UserExtra, Selector, LockValue, LockConfig).
+ */
+ cmd->param1 = CONFIG_ZONE;
+ cmd->param2 = DEVICE_LOCK_ADDR;
+ cmd->count = READ_COUNT;
+
+ atmel_ecc_checksum(cmd);
+
+ cmd->msecs = MAX_EXEC_TIME_READ;
+ cmd->rxsize = READ_RSP_SIZE;
+}
+
+static void atmel_ecc_init_genkey_cmd(struct atmel_ecc_cmd *cmd, u16 keyid)
+{
+ cmd->word_addr = COMMAND;
+ cmd->count = GENKEY_COUNT;
+ cmd->opcode = OPCODE_GENKEY;
+ cmd->param1 = GENKEY_MODE_PRIVATE;
+ /* a random private key will be generated and stored in slot keyID */
+ cmd->param2 = cpu_to_le16(keyid);
+
+ atmel_ecc_checksum(cmd);
+
+ cmd->msecs = MAX_EXEC_TIME_GENKEY;
+ cmd->rxsize = GENKEY_RSP_SIZE;
+}
+
+static int atmel_ecc_init_ecdh_cmd(struct atmel_ecc_cmd *cmd,
+ struct scatterlist *pubkey)
+{
+ size_t copied;
+
+ cmd->word_addr = COMMAND;
+ cmd->count = ECDH_COUNT;
+ cmd->opcode = OPCODE_ECDH;
+ cmd->param1 = ECDH_PREFIX_MODE;
+ /* private key slot */
+ cmd->param2 = cpu_to_le16(DATA_SLOT_2);
+
+ /*
+ * The device only supports NIST P256 ECC keys. The public key size will
+ * always be the same. Use a macro for the key size to avoid unnecessary
+ * computations.
+ */
+ copied = sg_copy_to_buffer(pubkey, 1, cmd->data, ATMEL_ECC_PUBKEY_SIZE);
+ if (copied != ATMEL_ECC_PUBKEY_SIZE)
+ return -EINVAL;
+
+ atmel_ecc_checksum(cmd);
+
+ cmd->msecs = MAX_EXEC_TIME_ECDH;
+ cmd->rxsize = ECDH_RSP_SIZE;
+
+ return 0;
+}
+
+/*
+ * After wake and after execution of a command, there will be error, status, or
+ * result bytes in the device's output register that can be retrieved by the
+ * system. When the length of that group is four bytes, the codes returned are
+ * detailed in error_list.
+ */
+static int atmel_ecc_status(struct device *dev, u8 *status)
+{
+ size_t err_list_len = ARRAY_SIZE(error_list);
+ int i;
+ u8 err_id = status[1];
+
+ if (*status != STATUS_SIZE)
+ return 0;
+
+ if (err_id == STATUS_WAKE_SUCCESSFUL || err_id == STATUS_NOERR)
+ return 0;
+
+ for (i = 0; i < err_list_len; i++)
+ if (error_list[i].value == err_id)
+ break;
+
+ /* if err_id is not in the error_list then ignore it */
+ if (i != err_list_len) {
+ dev_err(dev, "%02x: %s:\n", err_id, error_list[i].error_text);
+ return err_id;
+ }
+
+ return 0;
+}
+
+static int atmel_ecc_wakeup(struct i2c_client *client)
+{
+ struct atmel_ecc_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
+ u8 status[STATUS_RSP_SIZE];
+ int ret;
+
+ /*
+ * The device ignores any levels or transitions on the SCL pin when the
+ * device is idle, asleep or during waking up. Don't check for error
+ * when waking up the device.
+ */
+ i2c_master_send(client, i2c_priv->wake_token, i2c_priv->wake_token_sz);
+
+ /*
+ * Wait to wake the device. Typical execution times for ecdh and genkey
+ * are around tens of milliseconds. Delta is chosen to 50 microseconds.
+ */
+ usleep_range(TWHI_MIN, TWHI_MAX);
+
+ ret = i2c_master_recv(client, status, STATUS_SIZE);
+ if (ret < 0)
+ return ret;
+
+ return atmel_ecc_status(&client->dev, status);
+}
+
+static int atmel_ecc_sleep(struct i2c_client *client)
+{
+ u8 sleep = SLEEP_TOKEN;
+
+ return i2c_master_send(client, &sleep, 1);
+}
+
+static void atmel_ecdh_done(struct atmel_ecc_work_data *work_data, void *areq,
+ u8 status)
+{
+ struct kpp_request *req = areq;
+ struct atmel_ecdh_ctx *ctx = work_data->ctx;
+ struct atmel_ecc_cmd *cmd = &work_data->cmd;
+ size_t copied;
+ size_t n_sz = ctx->n_sz;
+
+ if (status)
+ goto free_work_data;
+
+ /* copy the shared secret */
+ copied = sg_copy_from_buffer(req->dst, 1, &cmd->data[RSP_DATA_IDX],
+ n_sz);
+ if (copied != n_sz)
+ status = -EINVAL;
+
+ /* fall through */
+free_work_data:
+ kzfree(work_data);
+ kpp_request_complete(req, status);
+}
+
+/*
+ * atmel_ecc_send_receive() - send a command to the device and receive its
+ * response.
+ * @client: i2c client device
+ * @cmd : structure used to communicate with the device
+ *
+ * After the device receives a Wake token, a watchdog counter starts within the
+ * device. After the watchdog timer expires, the device enters sleep mode
+ * regardless of whether some I/O transmission or command execution is in
+ * progress. If a command is attempted when insufficient time remains prior to
+ * watchdog timer execution, the device will return the watchdog timeout error
+ * code without attempting to execute the command. There is no way to reset the
+ * counter other than to put the device into sleep or idle mode and then
+ * wake it up again.
+ */
+static int atmel_ecc_send_receive(struct i2c_client *client,
+ struct atmel_ecc_cmd *cmd)
+{
+ struct atmel_ecc_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
+ int ret;
+
+ mutex_lock(&i2c_priv->lock);
+
+ ret = atmel_ecc_wakeup(client);
+ if (ret)
+ goto err;
+
+ /* send the command */
+ ret = i2c_master_send(client, (u8 *)cmd, cmd->count + WORD_ADDR_SIZE);
+ if (ret < 0)
+ goto err;
+
+ /* delay the appropriate amount of time for command to execute */
+ msleep(cmd->msecs);
+
+ /* receive the response */
+ ret = i2c_master_recv(client, cmd->data, cmd->rxsize);
+ if (ret < 0)
+ goto err;
+
+ /* put the device into low-power mode */
+ ret = atmel_ecc_sleep(client);
+ if (ret < 0)
+ goto err;
+
+ mutex_unlock(&i2c_priv->lock);
+ return atmel_ecc_status(&client->dev, cmd->data);
+err:
+ mutex_unlock(&i2c_priv->lock);
+ return ret;
+}
+
+static void atmel_ecc_work_handler(struct work_struct *work)
+{
+ struct atmel_ecc_work_data *work_data =
+ container_of(work, struct atmel_ecc_work_data, work);
+ struct atmel_ecc_cmd *cmd = &work_data->cmd;
+ struct i2c_client *client = work_data->ctx->client;
+ u8 status;
+
+ status = atmel_ecc_send_receive(client, cmd);
+ work_data->cbk(work_data, work_data->areq, status);
+}
+
+static void atmel_ecc_enqueue(struct atmel_ecc_work_data *work_data,
+ void (*cbk)(struct atmel_ecc_work_data *work_data,
+ void *areq, u8 status),
+ void *areq)
+{
+ work_data->cbk = (void *)cbk;
+ work_data->areq = areq;
+
+ INIT_WORK(&work_data->work, atmel_ecc_work_handler);
+ schedule_work(&work_data->work);
+}
+
+static unsigned int atmel_ecdh_supported_curve(unsigned int curve_id)
+{
+ if (curve_id == ECC_CURVE_NIST_P256)
+ return ATMEL_ECC_NIST_P256_N_SIZE;
+
+ return 0;
+}
+
+/*
+ * A random private key is generated and stored in the device. The device
+ * returns the pair public key.
+ */
+static int atmel_ecdh_set_secret(struct crypto_kpp *tfm, const void *buf,
+ unsigned int len)
+{
+ struct atmel_ecdh_ctx *ctx = kpp_tfm_ctx(tfm);
+ struct atmel_ecc_cmd *cmd;
+ void *public_key;
+ struct ecdh params;
+ int ret = -ENOMEM;
+
+ /* free the old public key, if any */
+ kfree(ctx->public_key);
+ /* make sure you don't free the old public key twice */
+ ctx->public_key = NULL;
+
+ if (crypto_ecdh_decode_key(buf, len, ¶ms) < 0) {
+ dev_err(&ctx->client->dev, "crypto_ecdh_decode_key failed\n");
+ return -EINVAL;
+ }
+
+ ctx->n_sz = atmel_ecdh_supported_curve(params.curve_id);
+ if (!ctx->n_sz || params.key_size) {
+ /* fallback to ecdh software implementation */
+ ctx->do_fallback = true;
+ return crypto_kpp_set_secret(ctx->fallback, buf, len);
+ }
+
+ cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
+ if (!cmd)
+ return -ENOMEM;
+
+ /*
+ * The device only supports NIST P256 ECC keys. The public key size will
+ * always be the same. Use a macro for the key size to avoid unnecessary
+ * computations.
+ */
+ public_key = kmalloc(ATMEL_ECC_PUBKEY_SIZE, GFP_KERNEL);
+ if (!public_key)
+ goto free_cmd;
+
+ ctx->do_fallback = false;
+ ctx->curve_id = params.curve_id;
+
+ atmel_ecc_init_genkey_cmd(cmd, DATA_SLOT_2);
+
+ ret = atmel_ecc_send_receive(ctx->client, cmd);
+ if (ret)
+ goto free_public_key;
+
+ /* save the public key */
+ memcpy(public_key, &cmd->data[RSP_DATA_IDX], ATMEL_ECC_PUBKEY_SIZE);
+ ctx->public_key = public_key;
+
+ kfree(cmd);
+ return 0;
+
+free_public_key:
+ kfree(public_key);
+free_cmd:
+ kfree(cmd);
+ return ret;
+}
+
+static int atmel_ecdh_generate_public_key(struct kpp_request *req)
+{
+ struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
+ struct atmel_ecdh_ctx *ctx = kpp_tfm_ctx(tfm);
+ size_t copied;
+ int ret = 0;
+
+ if (ctx->do_fallback) {
+ kpp_request_set_tfm(req, ctx->fallback);
+ return crypto_kpp_generate_public_key(req);
+ }
+
+ /* public key was saved at private key generation */
+ copied = sg_copy_from_buffer(req->dst, 1, ctx->public_key,
+ ATMEL_ECC_PUBKEY_SIZE);
+ if (copied != ATMEL_ECC_PUBKEY_SIZE)
+ ret = -EINVAL;
+
+ return ret;
+}
+
+static int atmel_ecdh_compute_shared_secret(struct kpp_request *req)
+{
+ struct crypto_kpp *tfm = crypto_kpp_reqtfm(req);
+ struct atmel_ecdh_ctx *ctx = kpp_tfm_ctx(tfm);
+ struct atmel_ecc_work_data *work_data;
+ gfp_t gfp;
+ int ret;
+
+ if (ctx->do_fallback) {
+ kpp_request_set_tfm(req, ctx->fallback);
+ return crypto_kpp_compute_shared_secret(req);
+ }
+
+ gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? GFP_KERNEL :
+ GFP_ATOMIC;
+
+ work_data = kmalloc(sizeof(*work_data), gfp);
+ if (!work_data)
+ return -ENOMEM;
+
+ work_data->ctx = ctx;
+
+ ret = atmel_ecc_init_ecdh_cmd(&work_data->cmd, req->src);
+ if (ret)
+ goto free_work_data;
+
+ atmel_ecc_enqueue(work_data, atmel_ecdh_done, req);
+
+ return -EINPROGRESS;
+
+free_work_data:
+ kfree(work_data);
+ return ret;
+}
+
+struct i2c_client *atmel_ecc_i2c_client_alloc(void)
+{
+ struct atmel_ecc_i2c_client_priv *i2c_priv, *min_i2c_priv = NULL;
+ struct i2c_client *client = ERR_PTR(-ENODEV);
+ int min_tfm_cnt = INT_MAX;
+ int tfm_cnt;
+
+ spin_lock(&driver_data.i2c_list_lock);
+
+ if (list_empty(&driver_data.i2c_client_list)) {
+ spin_unlock(&driver_data.i2c_list_lock);
+ return ERR_PTR(-ENODEV);
+ }
+
+ list_for_each_entry(i2c_priv, &driver_data.i2c_client_list,
+ i2c_client_list_node) {
+ tfm_cnt = atomic_read(&i2c_priv->tfm_count);
+ if (tfm_cnt < min_tfm_cnt) {
+ min_tfm_cnt = tfm_cnt;
+ min_i2c_priv = i2c_priv;
+ }
+ if (!min_tfm_cnt)
+ break;
+ }
+
+ if (min_i2c_priv) {
+ atomic_inc(&min_i2c_priv->tfm_count);
+ client = min_i2c_priv->client;
+ }
+
+ spin_unlock(&driver_data.i2c_list_lock);
+
+ return client;
+}
+
+void atmel_ecc_i2c_client_free(struct i2c_client *client)
+{
+ struct atmel_ecc_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
+
+ atomic_dec(&i2c_priv->tfm_count);
+}
+
+static int atmel_ecdh_init_tfm(struct crypto_kpp *tfm)
+{
+ const char *alg = kpp_alg_name(tfm);
+ struct crypto_kpp *fallback;
+ struct atmel_ecdh_ctx *ctx = kpp_tfm_ctx(tfm);
+
+ ctx->client = atmel_ecc_i2c_client_alloc();
+ if (IS_ERR(ctx->client)) {
+ pr_err("tfm - i2c_client binding failed\n");
+ return PTR_ERR(ctx->client);
+ }
+
+ fallback = crypto_alloc_kpp(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(fallback)) {
+ dev_err(&ctx->client->dev, "Failed to allocate transformation for '%s': %ld\n",
+ alg, PTR_ERR(fallback));
+ return PTR_ERR(fallback);
+ }
+
+ crypto_kpp_set_flags(fallback, crypto_kpp_get_flags(tfm));
+
+ dev_info(&ctx->client->dev, "Using '%s' as fallback implementation.\n",
+ crypto_tfm_alg_driver_name(crypto_kpp_tfm(fallback)));
+
+ ctx->fallback = fallback;
+
+ return 0;
+}
+
+static void atmel_ecdh_exit_tfm(struct crypto_kpp *tfm)
+{
+ struct atmel_ecdh_ctx *ctx = kpp_tfm_ctx(tfm);
+
+ kfree(ctx->public_key);
+ crypto_free_kpp(ctx->fallback);
+ atmel_ecc_i2c_client_free(ctx->client);
+}
+
+static unsigned int atmel_ecdh_max_size(struct crypto_kpp *tfm)
+{
+ struct atmel_ecdh_ctx *ctx = kpp_tfm_ctx(tfm);
+
+ if (ctx->fallback)
+ return crypto_kpp_maxsize(ctx->fallback);
+
+ /*
+ * The device only supports NIST P256 ECC keys. The public key size will
+ * always be the same. Use a macro for the key size to avoid unnecessary
+ * computations.
+ */
+ return ATMEL_ECC_PUBKEY_SIZE;
+}
+
+static struct kpp_alg atmel_ecdh = {
+ .set_secret = atmel_ecdh_set_secret,
+ .generate_public_key = atmel_ecdh_generate_public_key,
+ .compute_shared_secret = atmel_ecdh_compute_shared_secret,
+ .init = atmel_ecdh_init_tfm,
+ .exit = atmel_ecdh_exit_tfm,
+ .max_size = atmel_ecdh_max_size,
+ .base = {
+ .cra_flags = CRYPTO_ALG_NEED_FALLBACK,
+ .cra_name = "ecdh",
+ .cra_driver_name = "atmel-ecdh",
+ .cra_priority = ATMEL_ECC_PRIORITY,
+ .cra_module = THIS_MODULE,
+ .cra_ctxsize = sizeof(struct atmel_ecdh_ctx),
+ },
+};
+
+static inline size_t atmel_ecc_wake_token_sz(u32 bus_clk_rate)
+{
+ u32 no_of_bits = DIV_ROUND_UP(TWLO_USEC * bus_clk_rate, USEC_PER_SEC);
+
+ /* return the size of the wake_token in bytes */
+ return DIV_ROUND_UP(no_of_bits, 8);
+}
+
+static int device_sanity_check(struct i2c_client *client)
+{
+ struct atmel_ecc_cmd *cmd;
+ int ret;
+
+ cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
+ if (!cmd)
+ return -ENOMEM;
+
+ atmel_ecc_init_read_cmd(cmd);
+
+ ret = atmel_ecc_send_receive(client, cmd);
+ if (ret)
+ goto free_cmd;
+
+ /*
+ * It is vital that the Configuration, Data and OTP zones be locked
+ * prior to release into the field of the system containing the device.
+ * Failure to lock these zones may permit modification of any secret
+ * keys and may lead to other security problems.
+ */
+ if (cmd->data[LOCK_CONFIG_IDX] || cmd->data[LOCK_VALUE_IDX]) {
+ dev_err(&client->dev, "Configuration or Data and OTP zones are unlocked!\n");
+ ret = -ENOTSUPP;
+ }
+
+ /* fall through */
+free_cmd:
+ kfree(cmd);
+ return ret;
+}
+
+static int atmel_ecc_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct atmel_ecc_i2c_client_priv *i2c_priv;
+ struct device *dev = &client->dev;
+ int ret;
+ u32 bus_clk_rate;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(dev, "I2C_FUNC_I2C not supported\n");
+ return -ENODEV;
+ }
+
+ ret = of_property_read_u32(client->adapter->dev.of_node,
+ "clock-frequency", &bus_clk_rate);
+ if (ret) {
+ dev_err(dev, "of: failed to read clock-frequency property\n");
+ return ret;
+ }
+
+ if (bus_clk_rate > 1000000L) {
+ dev_err(dev, "%d exceeds maximum supported clock frequency (1MHz)\n",
+ bus_clk_rate);
+ return -EINVAL;
+ }
+
+ i2c_priv = devm_kmalloc(dev, sizeof(*i2c_priv), GFP_KERNEL);
+ if (!i2c_priv)
+ return -ENOMEM;
+
+ i2c_priv->client = client;
+ mutex_init(&i2c_priv->lock);
+
+ /*
+ * WAKE_TOKEN_MAX_SIZE was calculated for the maximum bus_clk_rate -
+ * 1MHz. The previous bus_clk_rate check ensures us that wake_token_sz
+ * will always be smaller than or equal to WAKE_TOKEN_MAX_SIZE.
+ */
+ i2c_priv->wake_token_sz = atmel_ecc_wake_token_sz(bus_clk_rate);
+
+ memset(i2c_priv->wake_token, 0, sizeof(i2c_priv->wake_token));
+
+ atomic_set(&i2c_priv->tfm_count, 0);
+
+ i2c_set_clientdata(client, i2c_priv);
+
+ ret = device_sanity_check(client);
+ if (ret)
+ return ret;
+
+ spin_lock(&driver_data.i2c_list_lock);
+ list_add_tail(&i2c_priv->i2c_client_list_node,
+ &driver_data.i2c_client_list);
+ spin_unlock(&driver_data.i2c_list_lock);
+
+ ret = crypto_register_kpp(&atmel_ecdh);
+ if (ret) {
+ spin_lock(&driver_data.i2c_list_lock);
+ list_del(&i2c_priv->i2c_client_list_node);
+ spin_unlock(&driver_data.i2c_list_lock);
+
+ dev_err(dev, "%s alg registration failed\n",
+ atmel_ecdh.base.cra_driver_name);
+ } else {
+ dev_info(dev, "atmel ecc algorithms registered in /proc/crypto\n");
+ }
+
+ return ret;
+}
+
+static int atmel_ecc_remove(struct i2c_client *client)
+{
+ struct atmel_ecc_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
+
+ /* Return EBUSY if i2c client already allocated. */
+ if (atomic_read(&i2c_priv->tfm_count)) {
+ dev_err(&client->dev, "Device is busy\n");
+ return -EBUSY;
+ }
+
+ crypto_unregister_kpp(&atmel_ecdh);
+
+ spin_lock(&driver_data.i2c_list_lock);
+ list_del(&i2c_priv->i2c_client_list_node);
+ spin_unlock(&driver_data.i2c_list_lock);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id atmel_ecc_dt_ids[] = {
+ {
+ .compatible = "atmel,atecc508a",
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, atmel_ecc_dt_ids);
+#endif
+
+static const struct i2c_device_id atmel_ecc_id[] = {
+ { "atecc508a", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, atmel_ecc_id);
+
+static struct i2c_driver atmel_ecc_driver = {
+ .driver = {
+ .name = "atmel-ecc",
+ .of_match_table = of_match_ptr(atmel_ecc_dt_ids),
+ },
+ .probe = atmel_ecc_probe,
+ .remove = atmel_ecc_remove,
+ .id_table = atmel_ecc_id,
+};
+
+static int __init atmel_ecc_init(void)
+{
+ spin_lock_init(&driver_data.i2c_list_lock);
+ INIT_LIST_HEAD(&driver_data.i2c_client_list);
+ return i2c_add_driver(&atmel_ecc_driver);
+}
+
+static void __exit atmel_ecc_exit(void)
+{
+ flush_scheduled_work();
+ i2c_del_driver(&atmel_ecc_driver);
+}
+
+module_init(atmel_ecc_init);
+module_exit(atmel_ecc_exit);
+
+MODULE_AUTHOR("Tudor Ambarus <tudor.ambarus@microchip.com>");
+MODULE_DESCRIPTION("Microchip / Atmel ECC (I2C) driver");
+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / blogic.git / commitdiff