Merge branch 'x86/vt-d' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu...

[cascardo/linux.git] / drivers / misc / eeprom / eeprom_93cx6.c

diff --git a/drivers/misc/eeprom/eeprom_93cx6.c b/drivers/misc/eeprom/eeprom_93cx6.c
index 0ff4b02..0cf2c9d 100644 (file)
--- a/drivers/misc/eeprom/eeprom_93cx6.c
+++ b/drivers/misc/eeprom/eeprom_93cx6.c
@@ -170,7 +170,7 @@ static void eeprom_93cx6_read_bits(struct eeprom_93cx6 *eeprom,
 }
 
 /**
- * eeprom_93cx6_read - Read multiple words from eeprom
+ * eeprom_93cx6_read - Read a word from eeprom
  * @eeprom: Pointer to eeprom structure
  * @word: Word index from where we should start reading
  * @data: target pointer where the information will have to be stored
@@ -234,6 +234,66 @@ void eeprom_93cx6_multiread(struct eeprom_93cx6 *eeprom, const u8 word,
 }
 EXPORT_SYMBOL_GPL(eeprom_93cx6_multiread);
 
+/**
+ * eeprom_93cx6_readb - Read a byte from eeprom
+ * @eeprom: Pointer to eeprom structure
+ * @word: Byte index from where we should start reading
+ * @data: target pointer where the information will have to be stored
+ *
+ * This function will read a byte of the eeprom data
+ * into the given data pointer.
+ */
+void eeprom_93cx6_readb(struct eeprom_93cx6 *eeprom, const u8 byte,
+       u8 *data)
+{
+       u16 command;
+       u16 tmp;
+
+       /*
+        * Initialize the eeprom register
+        */
+       eeprom_93cx6_startup(eeprom);
+
+       /*
+        * Select the read opcode and the byte to be read.
+        */
+       command = (PCI_EEPROM_READ_OPCODE << (eeprom->width + 1)) | byte;
+       eeprom_93cx6_write_bits(eeprom, command,
+               PCI_EEPROM_WIDTH_OPCODE + eeprom->width + 1);
+
+       /*
+        * Read the requested 8 bits.
+        */
+       eeprom_93cx6_read_bits(eeprom, &tmp, 8);
+       *data = tmp & 0xff;
+
+       /*
+        * Cleanup eeprom register.
+        */
+       eeprom_93cx6_cleanup(eeprom);
+}
+EXPORT_SYMBOL_GPL(eeprom_93cx6_readb);
+
+/**
+ * eeprom_93cx6_multireadb - Read multiple bytes from eeprom
+ * @eeprom: Pointer to eeprom structure
+ * @byte: Index from where we should start reading
+ * @data: target pointer where the information will have to be stored
+ * @words: Number of bytes that should be read.
+ *
+ * This function will read all requested bytes from the eeprom,
+ * this is done by calling eeprom_93cx6_readb() multiple times.
+ */
+void eeprom_93cx6_multireadb(struct eeprom_93cx6 *eeprom, const u8 byte,
+       u8 *data, const u16 bytes)
+{
+       unsigned int i;
+
+       for (i = 0; i < bytes; i++)
+               eeprom_93cx6_readb(eeprom, byte + i, &data[i]);
+}
+EXPORT_SYMBOL_GPL(eeprom_93cx6_multireadb);
+
 /**
  * eeprom_93cx6_wren - set the write enable state
  * @eeprom: Pointer to eeprom structure