i2c: at91: make use of the new infrastructure for quirks

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Tested-By: Ludovic Desroches <ludovic.desroches@atmel.com>

1 files changed, 11 insertions, 21 deletions

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 636fd2efad88..b3a70e8fc653 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -487,30 +487,10 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num)
         if (ret < 0)
                 goto out;
 
-        /*
-         * The hardware can handle at most two messages concatenated by a
-         * repeated start via it's internal address feature.
-         */
-        if (num > 2) {
-                dev_err(dev->dev,
-                        "cannot handle more than two concatenated messages.\n");
-                ret = 0;
-                goto out;
-        } else if (num == 2) {
+        if (num == 2) {
                 int internal_address = 0;
                 int i;
 
-                if (msg->flags & I2C_M_RD) {
-                        dev_err(dev->dev, "first transfer must be write.\n");
-                        ret = -EINVAL;
-                        goto out;
-                }
-                if (msg->len > 3) {
-                        dev_err(dev->dev, "first message size must be <= 3.\n");
-                        ret = -EINVAL;
-                        goto out;
-                }
-
                 /* 1st msg is put into the internal address, start with 2nd */
                 m_start = &msg[1];
                 for (i = 0; i < msg->len; ++i) {
@@ -540,6 +520,15 @@ out:
         return ret;
 }
 
+/*
+ * The hardware can handle at most two messages concatenated by a
+ * repeated start via it's internal address feature.
+ */
+static struct i2c_adapter_quirks at91_twi_quirks = {
+        .flags = I2C_AQ_COMB | I2C_AQ_COMB_WRITE_FIRST | I2C_AQ_COMB_SAME_ADDR,
+        .max_comb_1st_msg_len = 3,
+};
+
 static u32 at91_twi_func(struct i2c_adapter *adapter)
 {
         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL
@@ -777,6 +766,7 @@ static int at91_twi_probe(struct platform_device *pdev)
         dev->adapter.owner = THIS_MODULE;
         dev->adapter.class = I2C_CLASS_DEPRECATED;
         dev->adapter.algo = &at91_twi_algorithm;
+        dev->adapter.quirks = &at91_twi_quirks;
         dev->adapter.dev.parent = dev->dev;
         dev->adapter.nr = pdev->id;
         dev->adapter.timeout = AT91_I2C_TIMEOUT;