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linux/drivers/crypto/s5p-sss.c
Sachin Kamat a465348ff5 crypto: s5p-sss - Fix compilation error 
struct s3c2410_dma_client gets defined multiple times as it is defined
in more than one header file. Changing it at the header file level causes
many more build breakages as they are interdependent in a complex way.
Hence fixing this problem by using the mach version of the header file.

Without this patch, following build error is observed:
arch/arm/plat-samsung/include/plat/dma-pl330.h:106:27: error:
redefinition of struct s3c2410_dma_client

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-11-09 17:32:33 +08:00

692 lines
18 KiB
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/*
* Cryptographic API.
*
* Support for Samsung S5PV210 HW acceleration.
*
* Copyright (C) 2011 NetUP Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/crypto.h>
#include <linux/interrupt.h>
#include <crypto/algapi.h>
#include <crypto/aes.h>
#include <crypto/ctr.h>
#include <plat/cpu.h>
#include <mach/dma.h>
#define _SBF(s, v) ((v) << (s))
#define _BIT(b) _SBF(b, 1)
/* Feed control registers */
#define SSS_REG_FCINTSTAT 0x0000
#define SSS_FCINTSTAT_BRDMAINT _BIT(3)
#define SSS_FCINTSTAT_BTDMAINT _BIT(2)
#define SSS_FCINTSTAT_HRDMAINT _BIT(1)
#define SSS_FCINTSTAT_PKDMAINT _BIT(0)
#define SSS_REG_FCINTENSET 0x0004
#define SSS_FCINTENSET_BRDMAINTENSET _BIT(3)
#define SSS_FCINTENSET_BTDMAINTENSET _BIT(2)
#define SSS_FCINTENSET_HRDMAINTENSET _BIT(1)
#define SSS_FCINTENSET_PKDMAINTENSET _BIT(0)
#define SSS_REG_FCINTENCLR 0x0008
#define SSS_FCINTENCLR_BRDMAINTENCLR _BIT(3)
#define SSS_FCINTENCLR_BTDMAINTENCLR _BIT(2)
#define SSS_FCINTENCLR_HRDMAINTENCLR _BIT(1)
#define SSS_FCINTENCLR_PKDMAINTENCLR _BIT(0)
#define SSS_REG_FCINTPEND 0x000C
#define SSS_FCINTPEND_BRDMAINTP _BIT(3)
#define SSS_FCINTPEND_BTDMAINTP _BIT(2)
#define SSS_FCINTPEND_HRDMAINTP _BIT(1)
#define SSS_FCINTPEND_PKDMAINTP _BIT(0)
#define SSS_REG_FCFIFOSTAT 0x0010
#define SSS_FCFIFOSTAT_BRFIFOFUL _BIT(7)
#define SSS_FCFIFOSTAT_BRFIFOEMP _BIT(6)
#define SSS_FCFIFOSTAT_BTFIFOFUL _BIT(5)
#define SSS_FCFIFOSTAT_BTFIFOEMP _BIT(4)
#define SSS_FCFIFOSTAT_HRFIFOFUL _BIT(3)
#define SSS_FCFIFOSTAT_HRFIFOEMP _BIT(2)
#define SSS_FCFIFOSTAT_PKFIFOFUL _BIT(1)
#define SSS_FCFIFOSTAT_PKFIFOEMP _BIT(0)
#define SSS_REG_FCFIFOCTRL 0x0014
#define SSS_FCFIFOCTRL_DESSEL _BIT(2)
#define SSS_HASHIN_INDEPENDENT _SBF(0, 0x00)
#define SSS_HASHIN_CIPHER_INPUT _SBF(0, 0x01)
#define SSS_HASHIN_CIPHER_OUTPUT _SBF(0, 0x02)
#define SSS_REG_FCBRDMAS 0x0020
#define SSS_REG_FCBRDMAL 0x0024
#define SSS_REG_FCBRDMAC 0x0028
#define SSS_FCBRDMAC_BYTESWAP _BIT(1)
#define SSS_FCBRDMAC_FLUSH _BIT(0)
#define SSS_REG_FCBTDMAS 0x0030
#define SSS_REG_FCBTDMAL 0x0034
#define SSS_REG_FCBTDMAC 0x0038
#define SSS_FCBTDMAC_BYTESWAP _BIT(1)
#define SSS_FCBTDMAC_FLUSH _BIT(0)
#define SSS_REG_FCHRDMAS 0x0040
#define SSS_REG_FCHRDMAL 0x0044
#define SSS_REG_FCHRDMAC 0x0048
#define SSS_FCHRDMAC_BYTESWAP _BIT(1)
#define SSS_FCHRDMAC_FLUSH _BIT(0)
#define SSS_REG_FCPKDMAS 0x0050
#define SSS_REG_FCPKDMAL 0x0054
#define SSS_REG_FCPKDMAC 0x0058
#define SSS_FCPKDMAC_BYTESWAP _BIT(3)
#define SSS_FCPKDMAC_DESCEND _BIT(2)
#define SSS_FCPKDMAC_TRANSMIT _BIT(1)
#define SSS_FCPKDMAC_FLUSH _BIT(0)
#define SSS_REG_FCPKDMAO 0x005C
/* AES registers */
#define SSS_REG_AES_CONTROL 0x4000
#define SSS_AES_BYTESWAP_DI _BIT(11)
#define SSS_AES_BYTESWAP_DO _BIT(10)
#define SSS_AES_BYTESWAP_IV _BIT(9)
#define SSS_AES_BYTESWAP_CNT _BIT(8)
#define SSS_AES_BYTESWAP_KEY _BIT(7)
#define SSS_AES_KEY_CHANGE_MODE _BIT(6)
#define SSS_AES_KEY_SIZE_128 _SBF(4, 0x00)
#define SSS_AES_KEY_SIZE_192 _SBF(4, 0x01)
#define SSS_AES_KEY_SIZE_256 _SBF(4, 0x02)
#define SSS_AES_FIFO_MODE _BIT(3)
#define SSS_AES_CHAIN_MODE_ECB _SBF(1, 0x00)
#define SSS_AES_CHAIN_MODE_CBC _SBF(1, 0x01)
#define SSS_AES_CHAIN_MODE_CTR _SBF(1, 0x02)
#define SSS_AES_MODE_DECRYPT _BIT(0)
#define SSS_REG_AES_STATUS 0x4004
#define SSS_AES_BUSY _BIT(2)
#define SSS_AES_INPUT_READY _BIT(1)
#define SSS_AES_OUTPUT_READY _BIT(0)
#define SSS_REG_AES_IN_DATA(s) (0x4010 + (s << 2))
#define SSS_REG_AES_OUT_DATA(s) (0x4020 + (s << 2))
#define SSS_REG_AES_IV_DATA(s) (0x4030 + (s << 2))
#define SSS_REG_AES_CNT_DATA(s) (0x4040 + (s << 2))
#define SSS_REG_AES_KEY_DATA(s) (0x4080 + (s << 2))
#define SSS_REG(dev, reg) ((dev)->ioaddr + (SSS_REG_##reg))
#define SSS_READ(dev, reg) __raw_readl(SSS_REG(dev, reg))
#define SSS_WRITE(dev, reg, val) __raw_writel((val), SSS_REG(dev, reg))
/* HW engine modes */
#define FLAGS_AES_DECRYPT _BIT(0)
#define FLAGS_AES_MODE_MASK _SBF(1, 0x03)
#define FLAGS_AES_CBC _SBF(1, 0x01)
#define FLAGS_AES_CTR _SBF(1, 0x02)
#define AES_KEY_LEN 16
#define CRYPTO_QUEUE_LEN 1
struct s5p_aes_reqctx {
unsigned long mode;
};
struct s5p_aes_ctx {
struct s5p_aes_dev *dev;
uint8_t aes_key[AES_MAX_KEY_SIZE];
uint8_t nonce[CTR_RFC3686_NONCE_SIZE];
int keylen;
};
struct s5p_aes_dev {
struct device *dev;
struct clk *clk;
void __iomem *ioaddr;
int irq_hash;
int irq_fc;
struct ablkcipher_request *req;
struct s5p_aes_ctx *ctx;
struct scatterlist *sg_src;
struct scatterlist *sg_dst;
struct tasklet_struct tasklet;
struct crypto_queue queue;
bool busy;
spinlock_t lock;
};
static struct s5p_aes_dev *s5p_dev;
static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
{
SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
SSS_WRITE(dev, FCBRDMAL, sg_dma_len(sg));
}
static void s5p_set_dma_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
{
SSS_WRITE(dev, FCBTDMAS, sg_dma_address(sg));
SSS_WRITE(dev, FCBTDMAL, sg_dma_len(sg));
}
static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
{
/* holding a lock outside */
dev->req->base.complete(&dev->req->base, err);
dev->busy = false;
}
static void s5p_unset_outdata(struct s5p_aes_dev *dev)
{
dma_unmap_sg(dev->dev, dev->sg_dst, 1, DMA_FROM_DEVICE);
}
static void s5p_unset_indata(struct s5p_aes_dev *dev)
{
dma_unmap_sg(dev->dev, dev->sg_src, 1, DMA_TO_DEVICE);
}
static int s5p_set_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
{
int err;
if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
err = -EINVAL;
goto exit;
}
if (!sg_dma_len(sg)) {
err = -EINVAL;
goto exit;
}
err = dma_map_sg(dev->dev, sg, 1, DMA_FROM_DEVICE);
if (!err) {
err = -ENOMEM;
goto exit;
}
dev->sg_dst = sg;
err = 0;
exit:
return err;
}
static int s5p_set_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
{
int err;
if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
err = -EINVAL;
goto exit;
}
if (!sg_dma_len(sg)) {
err = -EINVAL;
goto exit;
}
err = dma_map_sg(dev->dev, sg, 1, DMA_TO_DEVICE);
if (!err) {
err = -ENOMEM;
goto exit;
}
dev->sg_src = sg;
err = 0;
exit:
return err;
}
static void s5p_aes_tx(struct s5p_aes_dev *dev)
{
int err = 0;
s5p_unset_outdata(dev);
if (!sg_is_last(dev->sg_dst)) {
err = s5p_set_outdata(dev, sg_next(dev->sg_dst));
if (err) {
s5p_aes_complete(dev, err);
return;
}
s5p_set_dma_outdata(dev, dev->sg_dst);
} else
s5p_aes_complete(dev, err);
}
static void s5p_aes_rx(struct s5p_aes_dev *dev)
{
int err;
s5p_unset_indata(dev);
if (!sg_is_last(dev->sg_src)) {
err = s5p_set_indata(dev, sg_next(dev->sg_src));
if (err) {
s5p_aes_complete(dev, err);
return;
}
s5p_set_dma_indata(dev, dev->sg_src);
}
}
static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
uint32_t status;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
if (irq == dev->irq_fc) {
status = SSS_READ(dev, FCINTSTAT);
if (status & SSS_FCINTSTAT_BRDMAINT)
s5p_aes_rx(dev);
if (status & SSS_FCINTSTAT_BTDMAINT)
s5p_aes_tx(dev);
SSS_WRITE(dev, FCINTPEND, status);
}
spin_unlock_irqrestore(&dev->lock, flags);
return IRQ_HANDLED;
}
static void s5p_set_aes(struct s5p_aes_dev *dev,
uint8_t *key, uint8_t *iv, unsigned int keylen)
{
void __iomem *keystart;
memcpy(dev->ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
if (keylen == AES_KEYSIZE_256)
keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(0);
else if (keylen == AES_KEYSIZE_192)
keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(2);
else
keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(4);
memcpy(keystart, key, keylen);
}
static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
{
struct ablkcipher_request *req = dev->req;
uint32_t aes_control;
int err;
unsigned long flags;
aes_control = SSS_AES_KEY_CHANGE_MODE;
if (mode & FLAGS_AES_DECRYPT)
aes_control |= SSS_AES_MODE_DECRYPT;
if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
aes_control |= SSS_AES_CHAIN_MODE_CBC;
else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
aes_control |= SSS_AES_CHAIN_MODE_CTR;
if (dev->ctx->keylen == AES_KEYSIZE_192)
aes_control |= SSS_AES_KEY_SIZE_192;
else if (dev->ctx->keylen == AES_KEYSIZE_256)
aes_control |= SSS_AES_KEY_SIZE_256;
aes_control |= SSS_AES_FIFO_MODE;
/* as a variant it is possible to use byte swapping on DMA side */
aes_control |= SSS_AES_BYTESWAP_DI
| SSS_AES_BYTESWAP_DO
| SSS_AES_BYTESWAP_IV
| SSS_AES_BYTESWAP_KEY
| SSS_AES_BYTESWAP_CNT;
spin_lock_irqsave(&dev->lock, flags);
SSS_WRITE(dev, FCINTENCLR,
SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
SSS_WRITE(dev, FCFIFOCTRL, 0x00);
err = s5p_set_indata(dev, req->src);
if (err)
goto indata_error;
err = s5p_set_outdata(dev, req->dst);
if (err)
goto outdata_error;
SSS_WRITE(dev, AES_CONTROL, aes_control);
s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
s5p_set_dma_indata(dev, req->src);
s5p_set_dma_outdata(dev, req->dst);
SSS_WRITE(dev, FCINTENSET,
SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
spin_unlock_irqrestore(&dev->lock, flags);
return;
outdata_error:
s5p_unset_indata(dev);
indata_error:
s5p_aes_complete(dev, err);
spin_unlock_irqrestore(&dev->lock, flags);
}
static void s5p_tasklet_cb(unsigned long data)
{
struct s5p_aes_dev *dev = (struct s5p_aes_dev *)data;
struct crypto_async_request *async_req, *backlog;
struct s5p_aes_reqctx *reqctx;
unsigned long flags;
spin_lock_irqsave(&dev->lock, flags);
backlog = crypto_get_backlog(&dev->queue);
async_req = crypto_dequeue_request(&dev->queue);
spin_unlock_irqrestore(&dev->lock, flags);
if (!async_req)
return;
if (backlog)
backlog->complete(backlog, -EINPROGRESS);
dev->req = ablkcipher_request_cast(async_req);
dev->ctx = crypto_tfm_ctx(dev->req->base.tfm);
reqctx = ablkcipher_request_ctx(dev->req);
s5p_aes_crypt_start(dev, reqctx->mode);
}
static int s5p_aes_handle_req(struct s5p_aes_dev *dev,
struct ablkcipher_request *req)
{
unsigned long flags;
int err;
spin_lock_irqsave(&dev->lock, flags);
if (dev->busy) {
err = -EAGAIN;
spin_unlock_irqrestore(&dev->lock, flags);
goto exit;
}
dev->busy = true;
err = ablkcipher_enqueue_request(&dev->queue, req);
spin_unlock_irqrestore(&dev->lock, flags);
tasklet_schedule(&dev->tasklet);
exit:
return err;
}
static int s5p_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
{
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
struct s5p_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
struct s5p_aes_reqctx *reqctx = ablkcipher_request_ctx(req);
struct s5p_aes_dev *dev = ctx->dev;
if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
pr_err("request size is not exact amount of AES blocks\n");
return -EINVAL;
}
reqctx->mode = mode;
return s5p_aes_handle_req(dev, req);
}
static int s5p_aes_setkey(struct crypto_ablkcipher *cipher,
const uint8_t *key, unsigned int keylen)
{
struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
if (keylen != AES_KEYSIZE_128 &&
keylen != AES_KEYSIZE_192 &&
keylen != AES_KEYSIZE_256)
return -EINVAL;
memcpy(ctx->aes_key, key, keylen);
ctx->keylen = keylen;
return 0;
}
static int s5p_aes_ecb_encrypt(struct ablkcipher_request *req)
{
return s5p_aes_crypt(req, 0);
}
static int s5p_aes_ecb_decrypt(struct ablkcipher_request *req)
{
return s5p_aes_crypt(req, FLAGS_AES_DECRYPT);
}
static int s5p_aes_cbc_encrypt(struct ablkcipher_request *req)
{
return s5p_aes_crypt(req, FLAGS_AES_CBC);
}
static int s5p_aes_cbc_decrypt(struct ablkcipher_request *req)
{
return s5p_aes_crypt(req, FLAGS_AES_DECRYPT | FLAGS_AES_CBC);
}
static int s5p_aes_cra_init(struct crypto_tfm *tfm)
{
struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->dev = s5p_dev;
tfm->crt_ablkcipher.reqsize = sizeof(struct s5p_aes_reqctx);
return 0;
}
static struct crypto_alg algs[] = {
{
.cra_name = "ecb(aes)",
.cra_driver_name = "ecb-aes-s5p",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s5p_aes_ctx),
.cra_alignmask = 0x0f,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = s5p_aes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = s5p_aes_setkey,
.encrypt = s5p_aes_ecb_encrypt,
.decrypt = s5p_aes_ecb_decrypt,
}
},
{
.cra_name = "cbc(aes)",
.cra_driver_name = "cbc-aes-s5p",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
CRYPTO_ALG_ASYNC |
CRYPTO_ALG_KERN_DRIVER_ONLY,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct s5p_aes_ctx),
.cra_alignmask = 0x0f,
.cra_type = &crypto_ablkcipher_type,
.cra_module = THIS_MODULE,
.cra_init = s5p_aes_cra_init,
.cra_u.ablkcipher = {
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.ivsize = AES_BLOCK_SIZE,
.setkey = s5p_aes_setkey,
.encrypt = s5p_aes_cbc_encrypt,
.decrypt = s5p_aes_cbc_decrypt,
}
},
};
static int s5p_aes_probe(struct platform_device *pdev)
{
int i, j, err = -ENODEV;
struct s5p_aes_dev *pdata;
struct device *dev = &pdev->dev;
struct resource *res;
if (s5p_dev)
return -EEXIST;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
if (!devm_request_mem_region(dev, res->start,
resource_size(res), pdev->name))
return -EBUSY;
pdata->clk = clk_get(dev, "secss");
if (IS_ERR(pdata->clk)) {
dev_err(dev, "failed to find secss clock source\n");
return -ENOENT;
}
clk_enable(pdata->clk);
spin_lock_init(&pdata->lock);
pdata->ioaddr = devm_ioremap(dev, res->start,
resource_size(res));
pdata->irq_hash = platform_get_irq_byname(pdev, "hash");
if (pdata->irq_hash < 0) {
err = pdata->irq_hash;
dev_warn(dev, "hash interrupt is not available.\n");
goto err_irq;
}
err = devm_request_irq(dev, pdata->irq_hash, s5p_aes_interrupt,
IRQF_SHARED, pdev->name, pdev);
if (err < 0) {
dev_warn(dev, "hash interrupt is not available.\n");
goto err_irq;
}
pdata->irq_fc = platform_get_irq_byname(pdev, "feed control");
if (pdata->irq_fc < 0) {
err = pdata->irq_fc;
dev_warn(dev, "feed control interrupt is not available.\n");
goto err_irq;
}
err = devm_request_irq(dev, pdata->irq_fc, s5p_aes_interrupt,
IRQF_SHARED, pdev->name, pdev);
if (err < 0) {
dev_warn(dev, "feed control interrupt is not available.\n");
goto err_irq;
}
pdata->dev = dev;
platform_set_drvdata(pdev, pdata);
s5p_dev = pdata;
tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
crypto_init_queue(&pdata->queue, CRYPTO_QUEUE_LEN);
for (i = 0; i < ARRAY_SIZE(algs); i++) {
err = crypto_register_alg(&algs[i]);
if (err)
goto err_algs;
}
pr_info("s5p-sss driver registered\n");
return 0;
err_algs:
dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
for (j = 0; j < i; j++)
crypto_unregister_alg(&algs[j]);
tasklet_kill(&pdata->tasklet);
err_irq:
clk_disable(pdata->clk);
clk_put(pdata->clk);
s5p_dev = NULL;
platform_set_drvdata(pdev, NULL);
return err;
}
static int s5p_aes_remove(struct platform_device *pdev)
{
struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
int i;
if (!pdata)
return -ENODEV;
for (i = 0; i < ARRAY_SIZE(algs); i++)
crypto_unregister_alg(&algs[i]);
tasklet_kill(&pdata->tasklet);
clk_disable(pdata->clk);
clk_put(pdata->clk);
s5p_dev = NULL;
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver s5p_aes_crypto = {
.probe = s5p_aes_probe,
.remove = s5p_aes_remove,
.driver = {
.owner = THIS_MODULE,
.name = "s5p-secss",
},
};
module_platform_driver(s5p_aes_crypto);
MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@gmail.com>");
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