Input: atmel_mxt_ts - add variable length __mxt_write_reg

The i2c bus requires 4 bytes to do a 1-byte write
(1 byte i2c address + 2 byte offset + 1 byte data).

By taking a length with writes, the driver can amortize transaction
overhead by performing larger transactions where appropriate.

This patch just sets up the new API.  Later patches refactor writes
to take advantage of the larger transactions.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index a68b2279e8df0c5363d439f851562e6f5cd16ac6..dd2577b796a401f26f819cc6c5c331a2f0b0b11a 100644 (file)
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -431,17 +431,24 @@ static int mxt_read_reg(struct i2c_client *client, u16 reg, u8 *val)
        return __mxt_read_reg(client, reg, 1, val);
 }
 
-static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
+static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
+                          const void *val)
 {
-       u8 buf[3];
+       u8 *buf;
+       size_t count;
        int ret;
 
+       count = len + 2;
+       buf = kmalloc(count, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
        buf[0] = reg & 0xff;
        buf[1] = (reg >> 8) & 0xff;
-       buf[2] = val;
+       memcpy(&buf[2], val, len);
 
-       ret = i2c_master_send(client, buf, 3);
-       if (ret == 3) {
+       ret = i2c_master_send(client, buf, count);
+       if (ret == count) {
                ret = 0;
        } else {
                if (ret >= 0)
@@ -450,9 +457,15 @@ static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
                        __func__, ret);
        }
 
+       kfree(buf);
        return ret;
 }
 
+static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
+{
+       return __mxt_write_reg(client, reg, 1, &val);
+}
+
 static int mxt_read_object_table(struct i2c_client *client,
                                      u16 reg, u8 *object_buf)
 {