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| author | Daniel Kurtz <djkurtz@chromium.org> | 2012-06-28 21:08:08 +0800 |
|---|---|---|
| committer | Henrik Rydberg <rydberg@euromail.se> | 2012-06-29 15:58:03 +0200 |
| commit | 43a91d51d3750dd9d5a6e5d14e9250a51f01f3c1 (patch) | |
| tree | 2f7cc6669eb4ff43f8b2f3dc5488ba1f5f4da6cd | |
| parent | 9c67b789e051449d3914d683ba3604c5babc4dd9 (diff) | |
| download | linux-next-43a91d51d3750dd9d5a6e5d14e9250a51f01f3c1.tar.gz | |
Input: atmel_mxt_ts - optimize reading objects in object sysfs entry
Read each object in a single i2c transaction instead of byte-by-byte
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
| -rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 35 |
1 files changed, 15 insertions, 20 deletions
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 55855b8c2efd..94dd1d156a98 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -479,20 +479,6 @@ static int mxt_read_message(struct mxt_data *data, sizeof(struct mxt_message), 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) { @@ -900,7 +886,14 @@ static ssize_t mxt_object_show(struct device *dev, int i, j; int error; u8 val; + u8 *obuf; + + /* Pre-allocate buffer large enough to hold max sized object. */ + obuf = kmalloc(256, GFP_KERNEL); + if (!obuf) + return -ENOMEM; + error = 0; for (i = 0; i < data->info.object_num; i++) { object = data->object_table + i; @@ -914,20 +907,22 @@ static ssize_t mxt_object_show(struct device *dev, continue; } + error = __mxt_read_reg(data->client, object->start_address, + object->size + 1, obuf); + if (error) + break; + for (j = 0; j < object->size + 1; j++) { - error = mxt_read_object(data, - object->type, j, &val); - if (error) - return error; + val = obuf[j]; count += scnprintf(buf + count, PAGE_SIZE - count, "\t[%2d]: %02x (%d)\n", j, val, val); } - count += scnprintf(buf + count, PAGE_SIZE - count, "\n"); } - return count; + kfree(obuf); + return error ?: count; } static int mxt_load_fw(struct device *dev, const char *fn) |