drivers/soc/qcom/cmd-db.c - kernel/msm-4.9 - Gitiles

 /* Copyright (c) 2016-2017, The Linux Foundation. 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 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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/module.h>
 #include <linux/types.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
 #include <linux/kernel.h>
 #include <linux/debugfs.h>
 #include <linux/fs.h>
 #include <linux/seq_file.h>
 #include <soc/qcom/cmd-db.h>

 #define RESOURCE_ID_LEN 8
 #define NUM_PRIORITY  2
 #define MAX_SLV_ID 8
 #define CMD_DB_MAGIC 0x0C0330DBUL
 #define SLAVE_ID_MASK 0x7
 #define SLAVE_ID_SHIFT 16
 #define CMD_DB_STANDALONE_MASK BIT(0)

 struct entry_header {
 	uint64_t res_id;
 	u32 priority[NUM_PRIORITY];
 	u32 addr;
 	u16 len;
 	u16 offset;
 };

 struct rsc_hdr {
 	u16  slv_id;
 	u16  header_offset;	/* Entry header offset from data  */
 	u16  data_offset;	/* Entry offset for data location */
 	u16  cnt;	/* Number of entries for HW type */
 	u16  version;	/* MSB is Major and LSB is Minor version
 			 * identifies the HW type of Aux Data
 			 */
 	u16 reserved[3];
 };

 struct cmd_db_header {
 	u32 version;
 	u32 magic_num;
 	struct rsc_hdr header[MAX_SLV_ID];
 	u32 check_sum;
 	u32 reserved;
 	u8 data[];
 };

 struct cmd_db_entry {
 	const char resource_id[RESOURCE_ID_LEN + 1]; /* Unique id per entry */
 	const u32 addr; /* TCS Addr Slave ID + Offset address */
 	const u32 priority[NUM_PRIORITY]; /* Bitmask for DRV IDs */
 	u32       len;                                 /* Aux data len */
 	u16       version;
 	u8        data[];
 };

 /* CMD DB QUERY TYPES */
 enum cmd_db_query_type {
 	CMD_DB_QUERY_RES_ID = 0,
 	CMD_DB_QUERY_ADDRESS,
 	CMD_DB_QUERY_INVALID,
 	CMD_DB_QUERY_MAX = 0x7ffffff,
 };

 static void __iomem *start_addr;
 static struct cmd_db_header *cmd_db_header;
 static int cmd_db_status = -EPROBE_DEFER;

 static u64 cmd_db_get_u64_id(const char *id)
 {
 	uint64_t rsc_id = 0;
 	uint8_t *ch  = (uint8_t *)&rsc_id;
 	int i;

 	for (i = 0; ((i < sizeof(rsc_id)) && id[i]); i++)
 		ch[i] = id[i];

 	return rsc_id;
 }

 static int cmd_db_get_header(u64 query, struct entry_header *eh,
 		struct rsc_hdr *rh, bool use_addr)
 {
 	struct rsc_hdr *rsc_hdr;
 	int i, j;

 	if (!cmd_db_header)
 		return -EPROBE_DEFER;

 	if (!eh || !rh)
 		return -EINVAL;

 	rsc_hdr = &cmd_db_header->header[0];

 	for (i = 0; i < MAX_SLV_ID ; i++, rsc_hdr++) {
 		struct entry_header *ent;

 		if (!rsc_hdr->slv_id)
 			break;

 		ent = (struct entry_header *)(start_addr
 				+ sizeof(*cmd_db_header)
 				+ rsc_hdr->header_offset);

 		for (j = 0; j < rsc_hdr->cnt; j++, ent++) {
 			if (use_addr) {
 				if (ent->addr == (u32)(query))
 					break;
 			} else if (ent->res_id == query)
 				break;
 		}

 		if (j < rsc_hdr->cnt) {
 			memcpy(eh, ent, sizeof(*ent));
 			memcpy(rh, &cmd_db_header->header[i], sizeof(*rh));
 			return 0;
 		}
 	}
 	return -ENODEV;
 }

 static int cmd_db_get_header_by_addr(u32 addr,
 		struct entry_header *ent_hdr,
 		struct rsc_hdr *rsc_hdr)
 {
 	return cmd_db_get_header((u64)addr, ent_hdr, rsc_hdr, true);
 }

 static int cmd_db_get_header_by_rsc_id(const char *resource_id,
 		struct entry_header *ent_hdr,
 		struct rsc_hdr *rsc_hdr)
 {
 	u64 rsc_id = cmd_db_get_u64_id(resource_id);

 	return cmd_db_get_header(rsc_id, ent_hdr, rsc_hdr, false);
 }

 u32 cmd_db_get_addr(const char *resource_id)
 {
 	int ret;
 	struct entry_header ent;
 	struct rsc_hdr rsc_hdr;

 	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);

 	return ret < 0 ? 0 : ent.addr;
 }

 bool cmd_db_get_priority(u32 addr, u8 drv_id)
 {
 	int ret;
 	struct entry_header ent;
 	struct rsc_hdr rsc_hdr;

 	ret = cmd_db_get_header_by_addr(addr, &ent, &rsc_hdr);

 	return ret < 0 ? false : (bool)(ent.priority[0] & (1 << drv_id));

 }
 int cmd_db_get_aux_data(const char *resource_id, u8 *data, int len)
 {
 	int ret;
 	struct entry_header ent;
 	struct rsc_hdr rsc_hdr;

 	if (!data)
 		return -EINVAL;

 	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);

 	if (ret)
 		return ret;

 	if (ent.len < len)
 		return -EINVAL;

 	len = (ent.len < len) ? ent.len : len;

 	memcpy_fromio(data,
 			start_addr + sizeof(*cmd_db_header)
 			+ rsc_hdr.data_offset + ent.offset,
 			len);
 	return len;
 }

 int cmd_db_get_aux_data_len(const char *resource_id)
 {
 	int ret;
 	struct entry_header ent;
 	struct rsc_hdr rsc_hdr;

 	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);

 	return ret < 0 ? 0 : ent.len;
 }

 u16 cmd_db_get_version(const char *resource_id)
 {
 	int ret;
 	struct entry_header ent;
 	struct rsc_hdr rsc_hdr;

 	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
 	return ret < 0 ? 0 : rsc_hdr.version;
 }

 int cmd_db_ready(void)
 {
 	return cmd_db_status;
 }

 int cmd_db_is_standalone(void)
 {
 	if (cmd_db_status < 0)
 		return cmd_db_status;

 	return !!(cmd_db_header->reserved & CMD_DB_STANDALONE_MASK);
 }

 int cmd_db_get_slave_id(const char *resource_id)
 {
 	int ret;
 	struct entry_header ent;
 	struct rsc_hdr rsc_hdr;

 	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
 	return ret < 0 ? 0 : (ent.addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
 }

 static void *cmd_db_start(struct seq_file *m, loff_t *pos)
 {
 	struct cmd_db_header *hdr = m->private;
 	int slv_idx, ent_idx;
 	struct entry_header *ent;
 	int total = 0;

 	for (slv_idx = 0; slv_idx < MAX_SLV_ID; slv_idx++) {

 		if (!hdr->header[slv_idx].cnt)
 			continue;
 		ent_idx = *pos - total;
 		if (ent_idx < hdr->header[slv_idx].cnt)
 			break;

 		total += hdr->header[slv_idx].cnt;
 	}

 	if (slv_idx == MAX_SLV_ID)
 		return NULL;

 	ent = start_addr + hdr->header[slv_idx].header_offset + sizeof(*hdr);
 	return &ent[ent_idx];

 }

 static void cmd_db_stop(struct seq_file *m, void *v)
 {
 }

 static void *cmd_db_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	(*pos)++;
 	return cmd_db_start(m, pos);
 }

 static int cmd_db_seq_show(struct seq_file *m, void *v)
 {
 	struct entry_header *eh = v;
 	struct cmd_db_header *hdr = m->private;
 	char buf[9]  = {0};

 	if (!eh)
 		return 0;

 	memcpy(buf, &eh->res_id, min(sizeof(eh->res_id), sizeof(buf)));

 	seq_printf(m, "Address: 0x%05x, id: %s", eh->addr, buf);

 	if (eh->len) {
 		int slv_id = (eh->addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
 		u8 aux[32] = {0};
 		int len;
 		int k;

 		len = min_t(u32, eh->len, sizeof(aux));

 		for (k = 0; k < MAX_SLV_ID; k++) {
 			if (hdr->header[k].slv_id == slv_id)
 				break;
 		}

 		if (k == MAX_SLV_ID)
 			return -EINVAL;

 		memcpy_fromio(aux, start_addr + hdr->header[k].data_offset
 			+ eh->offset + sizeof(*cmd_db_header), len);

 		seq_puts(m, ", aux data: ");

 		for (k = 0; k < len; k++)
 			seq_printf(m, "%02x ", aux[k]);

 	}
 	seq_puts(m, "\n");
 	return 0;
 }

 static const struct seq_operations cmd_db_seq_ops = {
 	.start = cmd_db_start,
 	.stop = cmd_db_stop,
 	.next = cmd_db_next,
 	.show = cmd_db_seq_show,
 };

 static int cmd_db_file_open(struct inode *inode, struct file *file)
 {
 	int ret = seq_open(file, &cmd_db_seq_ops);
 	struct seq_file *s = (struct seq_file *)(file->private_data);

 	s->private = inode->i_private;
 	return ret;
 }

 static const struct file_operations cmd_db_fops = {
 	.owner = THIS_MODULE,
 	.open = cmd_db_file_open,
 	.read = seq_read,
 	.release = seq_release,
 	.llseek = no_llseek,
 };

 static int cmd_db_dev_probe(struct platform_device *pdev)
 {
 	struct resource res;
 	void __iomem *dict;

 	dict = of_iomap(pdev->dev.of_node, 0);
 	if (!dict) {
 		cmd_db_status = -ENOMEM;
 		goto failed;
 	}

 	/*
 	 * Read start address and size of the command DB address from
 	 * shared dictionary location
 	 */
 	res.start = readl_relaxed(dict);
 	res.end = res.start + readl_relaxed(dict + 0x4);
 	res.flags = IORESOURCE_MEM;
 	iounmap(dict);

 	start_addr = devm_ioremap_resource(&pdev->dev, &res);

 	cmd_db_header = devm_kzalloc(&pdev->dev,
 			sizeof(*cmd_db_header), GFP_KERNEL);

 	if (!cmd_db_header) {
 		cmd_db_status = -ENOMEM;
 		goto failed;
 	}

 	memcpy(cmd_db_header, start_addr, sizeof(*cmd_db_header));

 	if (cmd_db_header->magic_num != CMD_DB_MAGIC) {
 		pr_err("%s(): Invalid Magic\n", __func__);
 		cmd_db_status = -EINVAL;
 		goto failed;
 	}
 	cmd_db_status = 0;
 	of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

 	if (!debugfs_create_file("cmd_db", 0444, NULL,
 				cmd_db_header, &cmd_db_fops))
 		pr_err("Couldn't create debugfs\n");

 	if (cmd_db_is_standalone() == 1)
 		pr_info("Command DB is initialized in standalone mode.\n");

 failed:
 	return cmd_db_status;
 }

 static const struct of_device_id cmd_db_match_table[] = {
 	{.compatible = "qcom,cmd-db"},
 	{},
 };

 static struct platform_driver cmd_db_dev_driver = {
 	.probe = cmd_db_dev_probe,
 	.driver = {
 		.name = "cmd-db",
 		.owner = THIS_MODULE,
 		.of_match_table = cmd_db_match_table,
 	},
 };

 int __init cmd_db_device_init(void)
 {
 	return platform_driver_register(&cmd_db_dev_driver);
 }
 arch_initcall(cmd_db_device_init);
	/* Copyright (c) 2016-2017, The Linux Foundation. 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 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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/module.h>
	#include <linux/types.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_platform.h>
	#include <linux/kernel.h>
	#include <linux/debugfs.h>
	#include <linux/fs.h>
	#include <linux/seq_file.h>
	#include <soc/qcom/cmd-db.h>

	#define RESOURCE_ID_LEN 8
	#define NUM_PRIORITY 2
	#define MAX_SLV_ID 8
	#define CMD_DB_MAGIC 0x0C0330DBUL
	#define SLAVE_ID_MASK 0x7
	#define SLAVE_ID_SHIFT 16
	#define CMD_DB_STANDALONE_MASK BIT(0)

	struct entry_header {
	uint64_t res_id;
	u32 priority[NUM_PRIORITY];
	u32 addr;
	u16 len;
	u16 offset;
	};

	struct rsc_hdr {
	u16 slv_id;
	u16 header_offset; /* Entry header offset from data */
	u16 data_offset; /* Entry offset for data location */
	u16 cnt; /* Number of entries for HW type */
	u16 version; /* MSB is Major and LSB is Minor version
	* identifies the HW type of Aux Data
	*/
	u16 reserved[3];
	};

	struct cmd_db_header {
	u32 version;
	u32 magic_num;
	struct rsc_hdr header[MAX_SLV_ID];
	u32 check_sum;
	u32 reserved;
	u8 data[];
	};

	struct cmd_db_entry {
	const char resource_id[RESOURCE_ID_LEN + 1]; /* Unique id per entry */
	const u32 addr; /* TCS Addr Slave ID + Offset address */
	const u32 priority[NUM_PRIORITY]; /* Bitmask for DRV IDs */
	u32 len; /* Aux data len */
	u16 version;
	u8 data[];
	};

	/* CMD DB QUERY TYPES */
	enum cmd_db_query_type {
	CMD_DB_QUERY_RES_ID = 0,
	CMD_DB_QUERY_ADDRESS,
	CMD_DB_QUERY_INVALID,
	CMD_DB_QUERY_MAX = 0x7ffffff,
	};

	static void __iomem *start_addr;
	static struct cmd_db_header *cmd_db_header;
	static int cmd_db_status = -EPROBE_DEFER;

	static u64 cmd_db_get_u64_id(const char *id)
	{
	uint64_t rsc_id = 0;
	uint8_t ch = (uint8_t )&rsc_id;
	int i;

	for (i = 0; ((i < sizeof(rsc_id)) && id[i]); i++)
	ch[i] = id[i];

	return rsc_id;
	}

	static int cmd_db_get_header(u64 query, struct entry_header *eh,
	struct rsc_hdr *rh, bool use_addr)
	{
	struct rsc_hdr *rsc_hdr;
	int i, j;

	if (!cmd_db_header)
	return -EPROBE_DEFER;

	if (!eh \|\| !rh)
	return -EINVAL;

	rsc_hdr = &cmd_db_header->header[0];

	for (i = 0; i < MAX_SLV_ID ; i++, rsc_hdr++) {
	struct entry_header *ent;

	if (!rsc_hdr->slv_id)
	break;

	ent = (struct entry_header *)(start_addr
	+ sizeof(*cmd_db_header)
	+ rsc_hdr->header_offset);

	for (j = 0; j < rsc_hdr->cnt; j++, ent++) {
	if (use_addr) {
	if (ent->addr == (u32)(query))
	break;
	} else if (ent->res_id == query)
	break;
	}

	if (j < rsc_hdr->cnt) {
	memcpy(eh, ent, sizeof(*ent));
	memcpy(rh, &cmd_db_header->header[i], sizeof(*rh));
	return 0;
	}
	}
	return -ENODEV;
	}

	static int cmd_db_get_header_by_addr(u32 addr,
	struct entry_header *ent_hdr,
	struct rsc_hdr *rsc_hdr)
	{
	return cmd_db_get_header((u64)addr, ent_hdr, rsc_hdr, true);
	}

	static int cmd_db_get_header_by_rsc_id(const char *resource_id,
	struct entry_header *ent_hdr,
	struct rsc_hdr *rsc_hdr)
	{
	u64 rsc_id = cmd_db_get_u64_id(resource_id);

	return cmd_db_get_header(rsc_id, ent_hdr, rsc_hdr, false);
	}

	u32 cmd_db_get_addr(const char *resource_id)
	{
	int ret;
	struct entry_header ent;
	struct rsc_hdr rsc_hdr;

	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);

	return ret < 0 ? 0 : ent.addr;
	}

	bool cmd_db_get_priority(u32 addr, u8 drv_id)
	{
	int ret;
	struct entry_header ent;
	struct rsc_hdr rsc_hdr;

	ret = cmd_db_get_header_by_addr(addr, &ent, &rsc_hdr);

	return ret < 0 ? false : (bool)(ent.priority[0] & (1 << drv_id));

	}
	int cmd_db_get_aux_data(const char resource_id, u8 data, int len)
	{
	int ret;
	struct entry_header ent;
	struct rsc_hdr rsc_hdr;

	if (!data)
	return -EINVAL;

	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);

	if (ret)
	return ret;

	if (ent.len < len)
	return -EINVAL;

	len = (ent.len < len) ? ent.len : len;

	memcpy_fromio(data,
	start_addr + sizeof(*cmd_db_header)
	+ rsc_hdr.data_offset + ent.offset,
	len);
	return len;
	}

	int cmd_db_get_aux_data_len(const char *resource_id)
	{
	int ret;
	struct entry_header ent;
	struct rsc_hdr rsc_hdr;

	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);

	return ret < 0 ? 0 : ent.len;
	}

	u16 cmd_db_get_version(const char *resource_id)
	{
	int ret;
	struct entry_header ent;
	struct rsc_hdr rsc_hdr;

	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
	return ret < 0 ? 0 : rsc_hdr.version;
	}

	int cmd_db_ready(void)
	{
	return cmd_db_status;
	}

	int cmd_db_is_standalone(void)
	{
	if (cmd_db_status < 0)
	return cmd_db_status;

	return !!(cmd_db_header->reserved & CMD_DB_STANDALONE_MASK);
	}

	int cmd_db_get_slave_id(const char *resource_id)
	{
	int ret;
	struct entry_header ent;
	struct rsc_hdr rsc_hdr;

	ret = cmd_db_get_header_by_rsc_id(resource_id, &ent, &rsc_hdr);
	return ret < 0 ? 0 : (ent.addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
	}

	static void cmd_db_start(struct seq_file m, loff_t *pos)
	{
	struct cmd_db_header *hdr = m->private;
	int slv_idx, ent_idx;
	struct entry_header *ent;
	int total = 0;

	for (slv_idx = 0; slv_idx < MAX_SLV_ID; slv_idx++) {

	if (!hdr->header[slv_idx].cnt)
	continue;
	ent_idx = *pos - total;
	if (ent_idx < hdr->header[slv_idx].cnt)
	break;

	total += hdr->header[slv_idx].cnt;
	}

	if (slv_idx == MAX_SLV_ID)
	return NULL;

	ent = start_addr + hdr->header[slv_idx].header_offset + sizeof(*hdr);
	return &ent[ent_idx];

	}

	static void cmd_db_stop(struct seq_file m, void v)
	{
	}

	static void cmd_db_next(struct seq_file m, void v, loff_t pos)
	{
	(*pos)++;
	return cmd_db_start(m, pos);
	}

	static int cmd_db_seq_show(struct seq_file m, void v)
	{
	struct entry_header *eh = v;
	struct cmd_db_header *hdr = m->private;
	char buf[9] = {0};

	if (!eh)
	return 0;

	memcpy(buf, &eh->res_id, min(sizeof(eh->res_id), sizeof(buf)));

	seq_printf(m, "Address: 0x%05x, id: %s", eh->addr, buf);

	if (eh->len) {
	int slv_id = (eh->addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
	u8 aux[32] = {0};
	int len;
	int k;

	len = min_t(u32, eh->len, sizeof(aux));

	for (k = 0; k < MAX_SLV_ID; k++) {
	if (hdr->header[k].slv_id == slv_id)
	break;
	}

	if (k == MAX_SLV_ID)
	return -EINVAL;

	memcpy_fromio(aux, start_addr + hdr->header[k].data_offset
	+ eh->offset + sizeof(*cmd_db_header), len);

	seq_puts(m, ", aux data: ");

	for (k = 0; k < len; k++)
	seq_printf(m, "%02x ", aux[k]);

	}
	seq_puts(m, "\n");
	return 0;
	}

	static const struct seq_operations cmd_db_seq_ops = {
	.start = cmd_db_start,
	.stop = cmd_db_stop,
	.next = cmd_db_next,
	.show = cmd_db_seq_show,
	};

	static int cmd_db_file_open(struct inode inode, struct file file)
	{
	int ret = seq_open(file, &cmd_db_seq_ops);
	struct seq_file s = (struct seq_file )(file->private_data);

	s->private = inode->i_private;
	return ret;
	}

	static const struct file_operations cmd_db_fops = {
	.owner = THIS_MODULE,
	.open = cmd_db_file_open,
	.read = seq_read,
	.release = seq_release,
	.llseek = no_llseek,
	};

	static int cmd_db_dev_probe(struct platform_device *pdev)
	{
	struct resource res;
	void __iomem *dict;

	dict = of_iomap(pdev->dev.of_node, 0);
	if (!dict) {
	cmd_db_status = -ENOMEM;
	goto failed;
	}

	/*
	* Read start address and size of the command DB address from
	* shared dictionary location
	*/
	res.start = readl_relaxed(dict);
	res.end = res.start + readl_relaxed(dict + 0x4);
	res.flags = IORESOURCE_MEM;
	iounmap(dict);

	start_addr = devm_ioremap_resource(&pdev->dev, &res);

	cmd_db_header = devm_kzalloc(&pdev->dev,
	sizeof(*cmd_db_header), GFP_KERNEL);

	if (!cmd_db_header) {
	cmd_db_status = -ENOMEM;
	goto failed;
	}

	memcpy(cmd_db_header, start_addr, sizeof(*cmd_db_header));

	if (cmd_db_header->magic_num != CMD_DB_MAGIC) {
	pr_err("%s(): Invalid Magic\n", __func__);
	cmd_db_status = -EINVAL;
	goto failed;
	}
	cmd_db_status = 0;
	of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);

	if (!debugfs_create_file("cmd_db", 0444, NULL,
	cmd_db_header, &cmd_db_fops))
	pr_err("Couldn't create debugfs\n");

	if (cmd_db_is_standalone() == 1)
	pr_info("Command DB is initialized in standalone mode.\n");

	failed:
	return cmd_db_status;
	}

	static const struct of_device_id cmd_db_match_table[] = {
	{.compatible = "qcom,cmd-db"},
	{},
	};

	static struct platform_driver cmd_db_dev_driver = {
	.probe = cmd_db_dev_probe,
	.driver = {
	.name = "cmd-db",
	.owner = THIS_MODULE,
	.of_match_table = cmd_db_match_table,
	},
	};

	int __init cmd_db_device_init(void)
	{
	return platform_driver_register(&cmd_db_dev_driver);
	}
	arch_initcall(cmd_db_device_init);