On Fri, Mar 30, 2012 at 12:49:18AM +0800, Daniel Kurtz wrote:
> Read each object with a single i2c transaction instead of byte-by-byte.
>
> Also, don't read T5, which is the message processor object. Reading
> it is counter-productive since it either holds garbage (there is no
> pending message), or, it holds a real message which should be handled
> by the messages handling code (the isr).
>
> Signed-off-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
> ---
> drivers/input/touchscreen/atmel_mxt_ts.c | 43 ++++++++++++------------------
> 1 files changed, 17 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> index b6e7109..a865967 100644
> --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> @@ -262,7 +262,6 @@ struct mxt_data {
> static bool mxt_object_readable(unsigned int type)
> {
> switch (type) {
> - case MXT_GEN_MESSAGE_T5:
> case MXT_GEN_COMMAND_T6:
> case MXT_GEN_POWER_T7:
> case MXT_GEN_ACQUIRE_T8:
> @@ -459,6 +458,13 @@ mxt_get_object(struct mxt_data *data, u8 type)
> return NULL;
> }
>
> +static int mxt_read_object(struct mxt_data *data, struct mxt_object *object,
> + void *val)
> +{
> + return mxt_read_reg(data->client, object->start_address, object->size,
> + val);
> +}
> +
> static int mxt_read_message(struct mxt_data *data,
> struct mxt_message *message)
> {
> @@ -474,20 +480,6 @@ static int mxt_read_message(struct mxt_data *data,
> message);
> }
>
> -static int mxt_read_object(struct mxt_data *data,
> - u8 type, u8 offset, u8 *val)
> -{
> - struct mxt_object *object;
> - u16 reg;
> -
> - object = mxt_get_object(data, type);
> - if (!object)
> - return -EINVAL;
> -
> - reg = object->start_address;
> - return mxt_read_reg(data->client, reg + offset, 1, val);
> -}
> -
> static int mxt_write_object(struct mxt_data *data,
> u8 type, u8 offset, u8 val)
> {
> @@ -885,17 +877,16 @@ static void mxt_calc_resolution(struct mxt_data *data)
> }
>
> static ssize_t mxt_object_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> + struct device_attribute *attr, char *buf)
> {
> struct mxt_data *data = dev_get_drvdata(dev);
> - struct mxt_object *object;
> int count = 0;
> int i, j;
> int error;
> - u8 val;
> + u8 obuf[256];
How large buffer do you need?
>
> for (i = 0; i < data->info.object_num; i++) {
> - object = data->object_table + i;
> + struct mxt_object *object = &data->object_table[i];
>
> count += snprintf(buf + count, PAGE_SIZE - count,
> "Object[%d] (Type %d)\n",
> @@ -905,20 +896,20 @@ static ssize_t mxt_object_show(struct device *dev,
>
> if (!mxt_object_readable(object->type)) {
> count += snprintf(buf + count, PAGE_SIZE - count,
> - "\n");
> + "\n");
> if (count >= PAGE_SIZE)
> return PAGE_SIZE - 1;
Odd return value - why not use scnprintf()?
> continue;
> }
>
> - for (j = 0; j < object->size; j++) {
> - error = mxt_read_object(data,
> - object->type, j, &val);
> - if (error)
> - return error;
> + error = mxt_read_object(data, object, obuf);
> + if (error)
> + return error;
>
> + for (j = 0; j < object->size; j++) {
> count += snprintf(buf + count, PAGE_SIZE - count,
> - "\t[%2d]: %02x (%d)\n", j, val, val);
> + "\t[%2d]: %02x (%d)\n", j, obuf[j],
> + obuf[j]);
> if (count >= PAGE_SIZE)
> return PAGE_SIZE - 1;
Ditto.
> }
> --
> 1.7.7.3
>
Thanks,
Henrik
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