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Input: atmel_mxt_ts - add variable length __mxt_write_reg

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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>
This commit is contained in:
Daniel Kurtz 2012-06-28 21:08:12 +08:00 committed by Henrik Rydberg
parent 771733e348
commit 9638ab7c9c
1 changed files with 18 additions and 5 deletions
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23
drivers/input/touchscreen/atmel_mxt_ts.c
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@ -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)
{