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Input: mms114 - fix handling of mms345l 

[ Upstream commit 3f8f770575 ]

MMS345L is another first generation touch screen from Melfas,
which uses the same registers as MMS152.

However, using I2C_M_NOSTART for it causes errors when reading:

	i2c i2c-0: sendbytes: NAK bailout.
	mms114 0-0048: __mms114_read_reg: i2c transfer failed (-5)

The driver works fine as soon as I2C_M_NOSTART is removed.

Reviewed-by: Andi Shyti <andi@etezian.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200405170904.61512-1-stephan@gerhold.net
[dtor: removed separate mms345l handling, made everyone use standard
transfer mode, propagated the 10bit addressing flag to the read part of the
transfer as well.]
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Stephan Gerhold 2020-04-09 13:49:03 -07:00 committed by Greg Kroah-Hartman
parent b4aa6da261
commit bafaf4708a
1 changed files with 5 additions and 7 deletions
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12
drivers/input/touchscreen/mms114.c
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@ -91,15 +91,15 @@ static int __mms114_read_reg(struct mms114_data *data, unsigned int reg,
if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL)
BUG();
/* Write register: use repeated start */
/* Write register */
xfer[0].addr = client->addr;
xfer[0].flags = I2C_M_TEN | I2C_M_NOSTART;
xfer[0].flags = client->flags & I2C_M_TEN;
xfer[0].len = 1;
xfer[0].buf = &buf;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD;
xfer[1].len = len;
xfer[1].buf = val;
@ -428,10 +428,8 @@ static int mms114_probe(struct i2c_client *client,
const void *match_data;
int error;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_PROTOCOL_MANGLING)) {
dev_err(&client->dev,
"Need i2c bus that supports protocol mangling\n");
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "Not supported I2C adapter\n");
return -ENODEV;
}