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path: root/drivers/i2c/busses/i2c-stub.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-stub.c')
-rw-r--r--drivers/i2c/busses/i2c-stub.c34
1 files changed, 31 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-stub.c b/drivers/i2c/busses/i2c-stub.c
index 1b7b2af94036..0c770eabe85e 100644
--- a/drivers/i2c/busses/i2c-stub.c
+++ b/drivers/i2c/busses/i2c-stub.c
@@ -35,6 +35,10 @@ module_param_array(chip_addr, ushort, NULL, S_IRUGO);
MODULE_PARM_DESC(chip_addr,
"Chip addresses (up to 10, between 0x03 and 0x77)");
+static unsigned long functionality = ~0UL;
+module_param(functionality, ulong, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(functionality, "Override functionality bitfield");
+
struct stub_chip {
u8 pointer;
u16 words[256]; /* Byte operations use the LSB as per SMBus
@@ -48,7 +52,7 @@ static s32 stub_xfer(struct i2c_adapter * adap, u16 addr, unsigned short flags,
char read_write, u8 command, int size, union i2c_smbus_data * data)
{
s32 ret;
- int i;
+ int i, len;
struct stub_chip *chip = NULL;
/* Search for the right chip */
@@ -118,6 +122,29 @@ static s32 stub_xfer(struct i2c_adapter * adap, u16 addr, unsigned short flags,
ret = 0;
break;
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ len = data->block[0];
+ if (read_write == I2C_SMBUS_WRITE) {
+ for (i = 0; i < len; i++) {
+ chip->words[command + i] &= 0xff00;
+ chip->words[command + i] |= data->block[1 + i];
+ }
+ dev_dbg(&adap->dev, "i2c block data - addr 0x%02x, "
+ "wrote %d bytes at 0x%02x.\n",
+ addr, len, command);
+ } else {
+ for (i = 0; i < len; i++) {
+ data->block[1 + i] =
+ chip->words[command + i] & 0xff;
+ }
+ dev_dbg(&adap->dev, "i2c block data - addr 0x%02x, "
+ "read %d bytes at 0x%02x.\n",
+ addr, len, command);
+ }
+
+ ret = 0;
+ break;
+
default:
dev_dbg(&adap->dev, "Unsupported I2C/SMBus command\n");
ret = -EOPNOTSUPP;
@@ -129,8 +156,9 @@ static s32 stub_xfer(struct i2c_adapter * adap, u16 addr, unsigned short flags,
static u32 stub_func(struct i2c_adapter *adapter)
{
- return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
- I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA;
+ return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_I2C_BLOCK) & functionality;
}
static const struct i2c_algorithm smbus_algorithm = {