HID: Intel-thc-hid: Intel-quicki2c: Use size_t for all length variables

Convert all length-related variables in the QuickI2C protocol layer to use
size_t type to follow kernel coding conventions.

This includes:
- All buffer length parameters and variables
- Return values of quicki2c_encode_cmd() function which represents
  encoded command buffer size.
- Return values of quicki2c_init_write_buf() function which represents
  process result: either prepared output buffer size or error code.

This change improves type consistency and aligns with standard kernel
practices for memory size representation, reducing potential issues
with size calculations and comparisons.

Signed-off-by: Even Xu <even.xu@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

Author: Evenxf

drivers/hid/intel-thc-hid/intel-quicki2c/quicki2c-dev.h

@@ -213,7 +213,7 @@ struct quicki2c_device {
 	u8 *report_descriptor;
 	u8 *input_buf;
 	u8 *report_buf;
-	u32 report_len;
+	size_t report_len;
 
 	wait_queue_head_t reset_ack_wq;
 	bool reset_ack;

drivers/hid/intel-thc-hid/intel-quicki2c/quicki2c-protocol.c

@@ -13,11 +13,11 @@
 #include "quicki2c-hid.h"
 #include "quicki2c-protocol.h"
 
-static int quicki2c_init_write_buf(struct quicki2c_device *qcdev, u32 cmd, int cmd_len,
-				   bool append_data_reg, u8 *data, int data_len,
-				   u8 *write_buf, int write_buf_len)
+static ssize_t quicki2c_init_write_buf(struct quicki2c_device *qcdev, u32 cmd, size_t cmd_len,
+				       bool append_data_reg, u8 *data, size_t data_len,
+				       u8 *write_buf, size_t write_buf_len)
 {
-	int buf_len, offset = 0;
+	size_t buf_len, offset = 0;
 
 	buf_len = HIDI2C_REG_LEN + cmd_len;
 
@@ -51,10 +51,10 @@ static int quicki2c_init_write_buf(struct quicki2c_device *qcdev, u32 cmd, int c
 	return buf_len;
 }
 
-static int quicki2c_encode_cmd(struct quicki2c_device *qcdev, u32 *cmd_buf,
-			       u8 opcode, u8 report_type, u8 report_id)
+static size_t quicki2c_encode_cmd(struct quicki2c_device *qcdev, u32 *cmd_buf,
+				  u8 opcode, u8 report_type, u8 report_id)
 {
-	int cmd_len;
+	size_t cmd_len;
 
 	*cmd_buf = FIELD_PREP(HIDI2C_CMD_OPCODE, opcode) |
 		   FIELD_PREP(HIDI2C_CMD_REPORT_TYPE, report_type);
@@ -72,22 +72,20 @@ static int quicki2c_encode_cmd(struct quicki2c_device *qcdev, u32 *cmd_buf,
 }
 
 static int write_cmd_to_txdma(struct quicki2c_device *qcdev, int opcode,
-			      int report_type, int report_id, u8 *buf, int buf_len)
+			      int report_type, int report_id, u8 *buf, size_t buf_len)
 {
-	size_t write_buf_len;
-	int cmd_len, ret;
+	size_t cmd_len;
+	ssize_t len;
 	u32 cmd;
 
 	cmd_len = quicki2c_encode_cmd(qcdev, &cmd, opcode, report_type, report_id);
 
-	ret = quicki2c_init_write_buf(qcdev, cmd, cmd_len, buf ? true : false, buf,
+	len = quicki2c_init_write_buf(qcdev, cmd, cmd_len, buf ? true : false, buf,
 				      buf_len, qcdev->report_buf, qcdev->report_len);
-	if (ret < 0)
-		return ret;
-
-	write_buf_len = ret;
+	if (len < 0)
+		return len;
 
-	return thc_dma_write(qcdev->thc_hw, qcdev->report_buf, write_buf_len);
+	return thc_dma_write(qcdev->thc_hw, qcdev->report_buf, len);
 }
 
 int quicki2c_set_power(struct quicki2c_device *qcdev, enum hidi2c_power_state power_state)
@@ -126,13 +124,13 @@ int quicki2c_get_report_descriptor(struct quicki2c_device *qcdev)
 }
 
 int quicki2c_get_report(struct quicki2c_device *qcdev, u8 report_type,
-			unsigned int reportnum, void *buf, u32 buf_len)
+			unsigned int reportnum, void *buf, size_t buf_len)
 {
 	struct hidi2c_report_packet *rpt;
-	size_t write_buf_len, read_len = 0;
-	int cmd_len, rep_type;
+	size_t cmd_len, read_len = 0;
+	int rep_type, ret;
+	ssize_t len;
 	u32 cmd;
-	int ret;
 
 	if (report_type == HID_INPUT_REPORT) {
 		rep_type = HIDI2C_INPUT;
@@ -145,25 +143,22 @@ int quicki2c_get_report(struct quicki2c_device *qcdev, u8 report_type,
 
 	cmd_len = quicki2c_encode_cmd(qcdev, &cmd, HIDI2C_GET_REPORT, rep_type, reportnum);
 
-	ret = quicki2c_init_write_buf(qcdev, cmd, cmd_len, true, NULL, 0,
+	len = quicki2c_init_write_buf(qcdev, cmd, cmd_len, true, NULL, 0,
 				      qcdev->report_buf, qcdev->report_len);
-	if (ret < 0)
-		return ret;
-
-	write_buf_len = ret;
+	if (len < 0)
+		return len;
 
 	rpt = (struct hidi2c_report_packet *)qcdev->input_buf;
 
-	ret = thc_swdma_read(qcdev->thc_hw, qcdev->report_buf, write_buf_len,
-			     NULL, rpt, &read_len);
+	ret = thc_swdma_read(qcdev->thc_hw, qcdev->report_buf, len, NULL, rpt, &read_len);
 	if (ret) {
-		dev_err_once(qcdev->dev, "Get report failed, ret %d, read len (%zu vs %d)\n",
+		dev_err_once(qcdev->dev, "Get report failed, ret %d, read len (%zu vs %zu)\n",
 			     ret, read_len, buf_len);
 		return ret;
 	}
 
 	if (HIDI2C_DATA_LEN(le16_to_cpu(rpt->len)) != buf_len || rpt->data[0] != reportnum) {
-		dev_err_once(qcdev->dev, "Invalid packet, len (%d vs %d) report id (%d vs %d)\n",
+		dev_err_once(qcdev->dev, "Invalid packet, len (%d vs %zu) report id (%d vs %d)\n",
 			     le16_to_cpu(rpt->len), buf_len, rpt->data[0], reportnum);
 		return -EINVAL;
 	}
@@ -174,7 +169,7 @@ int quicki2c_get_report(struct quicki2c_device *qcdev, u8 report_type,
 }
 
 int quicki2c_set_report(struct quicki2c_device *qcdev, u8 report_type,
-			unsigned int reportnum, void *buf, u32 buf_len)
+			unsigned int reportnum, void *buf, size_t buf_len)
 {
 	int rep_type;
 	int ret;

drivers/hid/intel-thc-hid/intel-quicki2c/quicki2c-protocol.h

@@ -10,9 +10,9 @@ struct quicki2c_device;
 
 int quicki2c_set_power(struct quicki2c_device *qcdev, enum hidi2c_power_state power_state);
 int quicki2c_get_report(struct quicki2c_device *qcdev, u8 report_type,
-			unsigned int reportnum, void *buf, u32 buf_len);
+			unsigned int reportnum, void *buf, size_t buf_len);
 int quicki2c_set_report(struct quicki2c_device *qcdev, u8 report_type,
-			unsigned int reportnum, void *buf, u32 buf_len);
+			unsigned int reportnum, void *buf, size_t buf_len);
 int quicki2c_get_device_descriptor(struct quicki2c_device *qcdev);
 int quicki2c_get_report_descriptor(struct quicki2c_device *qcdev);
 int quicki2c_reset(struct quicki2c_device *qcdev);