add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/drivers/misc/eeprom/at24.c
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@@ -6,6 +6,7 @@
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  * Copyright (C) 2008 Wolfram Sang, Pengutronix
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  */
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8
 
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+#define DEBUG
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 #include <linux/kernel.h>
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 #include <linux/init.h>
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 #include <linux/module.h>
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@@ -106,6 +107,8 @@
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 module_param_named(write_timeout, at24_write_timeout, uint, 0);
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 MODULE_PARM_DESC(at24_write_timeout, "Time (in ms) to try writes (default 25)");
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+//Ben
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+struct at24_data *at24_private=NULL;
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 struct at24_chip_data {
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 	/*
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 	 * these fields mirror their equivalents in
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@@ -421,6 +424,146 @@
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 	return 0;
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 }
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426
 
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+//add ben
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+static ssize_t at24_read_private(struct at24_data *at24,
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+		char *buf, loff_t off, size_t count)
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+{
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+	ssize_t retval = 0;
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+
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+	if (unlikely(!count))
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+		return count;
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+
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+	if (off + count > at24->byte_len)
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+		return -EINVAL;
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+	
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+	/*
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+	 * Read data from chip, protecting against concurrent updates
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+	 * from this host, but not from other I2C masters.
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+	 */
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+	mutex_lock(&at24->lock);
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+
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+	while (count) {
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+		ssize_t	status;
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+
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+		//status = at24_eeprom_read_i2c(at24, buf, off, count);
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+		status = at24_regmap_read(at24, buf, off, count);
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+		if (status <= 0) {
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+			if (retval == 0)
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+				retval = status;
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+			break;
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+		}
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+		buf += status;
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+		off += status;
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+		count -= status;
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+		retval += status;
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+	}
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+
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+	mutex_unlock(&at24->lock);
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+
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+	return retval;
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+}
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+
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+#if 0
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+static unsigned char AscToHex(unsigned char aChar)
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+{
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+    if((aChar>=0x30)&&(aChar<=0x39))
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+        aChar -= 0x30;
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+    else if((aChar>=0x41)&&(aChar<=0x46))
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+        aChar -= 0x37;
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+    else if((aChar>=0x61)&&(aChar<=0x66))
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+        aChar -= 0x57;
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+    else aChar = 0xff;
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+
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+    return aChar; 
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+}
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+#endif
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+
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+#if 0
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+ssize_t at24_mac_read(unsigned char* addr)
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+{
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+	char buf[20];
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+	char buf_tmp[12];
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+	int i;
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+	ssize_t ret;	
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+	if (at24_private == NULL)
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+	{
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+		printk("ben %s: at24_private==null error\n", __func__);
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+		return 0;
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+	}
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+	memset(buf, 0x00, 20);
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+	memset(buf_tmp, 0x00, 12);
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+	ret = at24_read(at24_private, 0, buf, 12);
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+	if (ret > 0)
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+	{	
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+		for(i=0; i<12; i++)
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+		{
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+			buf_tmp[i] = AscToHex(buf[i]);
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+		}
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+		addr[0] = (buf_tmp[0] << 4) | buf_tmp[1];
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+		addr[1] = (buf_tmp[2] << 4) | buf_tmp[3];
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+		addr[2] = (buf_tmp[4] << 4) | buf_tmp[5];
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+		addr[3] = (buf_tmp[6] << 4) | buf_tmp[7];
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+		addr[4] = (buf_tmp[8] << 4) | buf_tmp[9];
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+		addr[5] = (buf_tmp[10] << 4) | buf_tmp[11]; 	
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+	}
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+	return ret;
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+}
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+#endif
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+
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+ssize_t at24_mac_read(unsigned char* addr)
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+{
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+	char buf[20];
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+	char buf_tmp[12];
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+	ssize_t ret;	
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+	if (at24_private == NULL)
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+	{
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+		printk("ben: at24_mac_read at24_private==null error");
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+		return 0;
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+	}
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+	memset(buf, 0x00, 20);
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+	memset(buf_tmp, 0x00, 12);
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+	ret = at24_read_private(at24_private, buf, 0, 6);
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+	if (ret > 0)
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+	{	
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+		addr[0] = buf[0];
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+		addr[1] = buf[1];
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+		addr[2] = buf[2];
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+		addr[3] = buf[3];
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+		addr[4] = buf[4];
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+		addr[5] = buf[5];	
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+	}
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+	printk("at24_mac_read ...............\n");
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+	return ret;
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+}
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+EXPORT_SYMBOL(at24_mac_read);
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+
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+ssize_t at24_mac1_read(unsigned char* mac)
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+{
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+	char buf[20];
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+	char buf_tmp[12];
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+	ssize_t ret;
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+	if (at24_private == NULL)
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+	{
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+		printk("zcl: at24_mac_read at24_private==null error");
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+		return 0;
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+	}
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+	memset(buf, 0x00, 20);
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+	memset(buf_tmp, 0x00, 12);
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+	ret = at24_read_private(at24_private, buf, 0x10, 6);
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+	if (ret > 0)
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+	{
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+		*mac = buf[0];
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+		*(mac + 1) = buf[1];
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+		*(mac + 2) = buf[2];
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+		*(mac + 3) = buf[3];
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+		*(mac + 4) = buf[4];
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+		*(mac + 5) = buf[5];
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+	}
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+	printk("at24_mac1_read ...............\n");
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+	return ret;
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+}
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+EXPORT_SYMBOL(at24_mac1_read);
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+
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 static int at24_write(void *priv, unsigned int off, void *val, size_t count)
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 {
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569
 	struct at24_data *at24;
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@@ -630,6 +773,7 @@
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 	u8 test_byte;
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 	int err;
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775
 
776
+	printk("ben %s ...\n", __func__);
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 	i2c_fn_i2c = i2c_check_functionality(client->adapter, I2C_FUNC_I2C);
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 	i2c_fn_block = i2c_check_functionality(client->adapter,
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 					       I2C_FUNC_SMBUS_WRITE_I2C_BLOCK);
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@@ -674,6 +818,7 @@
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 	if (!at24)
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 		return -ENOMEM;
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820
 
821
+	at24_private = at24;
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822
 	mutex_init(&at24->lock);
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823
 	at24->byte_len = pdata.byte_len;
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824
 	at24->page_size = pdata.page_size;
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@@ -792,7 +937,8 @@
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 	at24_io_limit = rounddown_pow_of_two(at24_io_limit);
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 	return i2c_add_driver(&at24_driver);
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 }
795
-module_init(at24_init);
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+//module_init(at24_init);
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+postcore_initcall_sync(at24_init);
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 static void __exit at24_exit(void)
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 {