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Subject[PATCH 05/20] Input: atmel_mxt_ts - dump mxt_read/write_reg
Date
For verbose on-the-wire debugging.
Prints DUMP_LEN bytes (in hex) per line.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 31 ++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index defd4e1..dd3919a 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -397,6 +397,33 @@ static int mxt_fw_write(struct i2c_client *client,
return 0;
}

+#ifdef DEBUG
+#define DUMP_LEN 16
+static void mxt_dump_xfer(struct device *dev, const char *func, u16 reg,
+ u16 len, const u8 *val)
+{
+ /* Rough guess for string size */
+ char str[DUMP_LEN * 3 + 2];
+ int i;
+ size_t n;
+
+ for (i = 0, n = 0; i < len; i++) {
+ n += snprintf(&str[n], sizeof(str) - n, "%02x ", val[i]);
+ if ((i + 1) % DUMP_LEN == 0 || (i + 1) == len) {
+ dev_dbg(dev,
+ "%s(reg: %d len: %d offset: 0x%02x): %s\n",
+ func, reg, len, (i / DUMP_LEN) * DUMP_LEN,
+ str);
+ n = 0;
+ }
+ }
+}
+#undef DUMP_LEN
+#else
+static void mxt_dump_xfer(struct device *dev, const char *func, u16 reg,
+ u16 len, const u8 *val) { }
+#endif
+
static int mxt_read_reg(struct i2c_client *client, u16 reg, u16 len, void *val)
{
struct i2c_msg xfer[2];
@@ -422,6 +449,8 @@ static int mxt_read_reg(struct i2c_client *client, u16 reg, u16 len, void *val)
return -EIO;
}

+ mxt_dump_xfer(&client->dev, __func__, reg, len, val);
+
return 0;
}

@@ -435,6 +464,8 @@ static int mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
buf[1] = (reg >> 8) & 0xff;
memcpy(&buf[2], val, len);

+ mxt_dump_xfer(&client->dev, __func__, reg, len, val);
+
if (i2c_master_send(client, buf, count) != count) {
dev_err(&client->dev, "%s: i2c write failed\n", __func__);
return -EIO;
--
1.7.7.3


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