[PATCH v3 5/9] input: elants: refactor elants_i2c_execute_command()

From: MichaÅ MirosÅaw
Date: Mon Apr 13 2020 - 09:32:45 EST

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Apply some DRY-ing to elants_i2c_execute_command() callers. This pulls
polling and error printk()s into a single function.

Signed-off-by: MichaÅ MirosÅaw <mirq-linux@xxxxxxxxxxxx>
---
drivers/input/touchscreen/elants_i2c.c | 189 +++++++++++++------------
1 file changed, 96 insertions(+), 93 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 87d686ce08f2..b0f083f7f2a9 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -205,7 +205,8 @@ static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)

static int elants_i2c_execute_command(struct i2c_client *client,
const u8 *cmd, size_t cmd_size,
- u8 *resp, size_t resp_size)
+ u8 *resp, size_t resp_size,
+ int retries, const char *cmd_name)
{
struct i2c_msg msgs[2];
int ret;
@@ -225,30 +226,55 @@ static int elants_i2c_execute_command(struct i2c_client *client,
break;

default:
- dev_err(&client->dev, "%s: invalid command %*ph\n",
- __func__, (int)cmd_size, cmd);
+ dev_err(&client->dev, "(%s): invalid command: %*ph\n",
+ cmd_name, (int)cmd_size, cmd);
return -EINVAL;
}

- msgs[0].addr = client->addr;
- msgs[0].flags = client->flags & I2C_M_TEN;
- msgs[0].len = cmd_size;
- msgs[0].buf = (u8 *)cmd;
+ for (;;) {
+ msgs[0].addr = client->addr;
+ msgs[0].flags = client->flags & I2C_M_TEN;
+ msgs[0].len = cmd_size;
+ msgs[0].buf = (u8 *)cmd;

- msgs[1].addr = client->addr;
- msgs[1].flags = client->flags & I2C_M_TEN;
- msgs[1].flags |= I2C_M_RD;
- msgs[1].len = resp_size;
- msgs[1].buf = resp;
+ msgs[1].addr = client->addr;
+ msgs[1].flags = client->flags & I2C_M_TEN;
+ msgs[1].flags |= I2C_M_RD;
+ msgs[1].len = resp_size;
+ msgs[1].buf = resp;

- ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
- if (ret < 0)
- return ret;
+ ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+ if (ret < 0) {
+ if (--retries > 0) {
+ dev_dbg(&client->dev,
+ "(%s) I2C transfer failed: %d (retrying)\n",
+ cmd_name, ret);
+ continue;
+ }

- if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
- return -EIO;
+ dev_err(&client->dev,
+ "(%s) I2C transfer failed: %d\n",
+ cmd_name, ret);
+ return ret;
+ }

- return 0;
+ if (ret != ARRAY_SIZE(msgs) ||
+ resp[FW_HDR_TYPE] != expected_response) {
+ if (--retries > 0) {
+ dev_dbg(&client->dev,
+ "(%s) unexpected response: %*ph (retrying)\n",
+ cmd_name, ret, resp);
+ continue;
+ }
+
+ dev_err(&client->dev,
+ "(%s) unexpected response: %*ph\n",
+ cmd_name, ret, resp);
+ return -EIO;
+ }
+
+ return --retries;
+ }
}

static int elants_i2c_calibrate(struct elants_data *ts)
@@ -321,27 +347,20 @@ static u16 elants_i2c_parse_version(u8 *buf)
static int elants_i2c_query_hw_version(struct elants_data *ts)
{
struct i2c_client *client = ts->client;
- int error, retry_cnt;
+ int retry_cnt = MAX_RETRIES;
const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
u8 resp[HEADER_SIZE];

- for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
- error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
- resp, sizeof(resp));
- if (!error) {
- ts->hw_version = elants_i2c_parse_version(resp);
- if (ts->hw_version != 0xffff)
- return 0;
- }
+ while (retry_cnt) {
+ retry_cnt = elants_i2c_execute_command(client, cmd, sizeof(cmd),
+ resp, sizeof(resp),
+ retry_cnt, "read fw id");
+ if (retry_cnt < 0)
+ return retry_cnt;

- dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
- error, (int)sizeof(resp), resp);
- }
-
- if (error) {
- dev_err(&client->dev,
- "Failed to read fw id: %d\n", error);
- return error;
+ ts->hw_version = elants_i2c_parse_version(resp);
+ if (ts->hw_version != 0xffff)
+ return 0;
}

dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
@@ -352,26 +371,28 @@ static int elants_i2c_query_hw_version(struct elants_data *ts)
static int elants_i2c_query_fw_version(struct elants_data *ts)
{
struct i2c_client *client = ts->client;
- int error, retry_cnt;
+ int retry_cnt = MAX_RETRIES;
const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
u8 resp[HEADER_SIZE];

- for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
- error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
- resp, sizeof(resp));
- if (!error) {
- ts->fw_version = elants_i2c_parse_version(resp);
- if (ts->fw_version != 0x0000 &&
- ts->fw_version != 0xffff)
- return 0;
- }
+ while (retry_cnt) {
+ retry_cnt = elants_i2c_execute_command(client, cmd,
+ sizeof(cmd),
+ resp, sizeof(resp),
+ retry_cnt,
+ "read fw version");
+ if (retry_cnt < 0)
+ return retry_cnt;

- dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
- error, (int)sizeof(resp), resp);
+ ts->fw_version = elants_i2c_parse_version(resp);
+ if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff)
+ return 0;
+
+ dev_dbg(&client->dev, "(read fw version) resp %*phC\n",
+ (int)sizeof(resp), resp);
}

- dev_err(&client->dev,
- "Failed to read fw version or fw version is invalid\n");
+ dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version);

return -EINVAL;
}
@@ -379,25 +400,20 @@ static int elants_i2c_query_fw_version(struct elants_data *ts)
static int elants_i2c_query_test_version(struct elants_data *ts)
{
struct i2c_client *client = ts->client;
- int error, retry_cnt;
+ int error;
u16 version;
const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
u8 resp[HEADER_SIZE];

- for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
- error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
- resp, sizeof(resp));
- if (!error) {
- version = elants_i2c_parse_version(resp);
- ts->test_version = version >> 8;
- ts->solution_version = version & 0xff;
+ error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
+ resp, sizeof(resp), MAX_RETRIES,
+ "read test version");
+ if (error >= 0) {
+ version = elants_i2c_parse_version(resp);
+ ts->test_version = version >> 8;
+ ts->solution_version = version & 0xff;

- return 0;
- }
-
- dev_dbg(&client->dev,
- "read test version error rc=%d, buf=%*phC\n",
- error, (int)sizeof(resp), resp);
+ return 0;
}

dev_err(&client->dev, "Failed to read test version\n");
@@ -414,13 +430,10 @@ static int elants_i2c_query_bc_version(struct elants_data *ts)
int error;

error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
- resp, sizeof(resp));
- if (error) {
- dev_err(&client->dev,
- "read BC version error=%d, buf=%*phC\n",
- error, (int)sizeof(resp), resp);
+ resp, sizeof(resp), 1,
+ "read BC version");
+ if (error)
return error;
- }

version = elants_i2c_parse_version(resp);
ts->bc_version = version >> 8;
@@ -452,12 +465,10 @@ static int elants_i2c_query_ts_info(struct elants_data *ts)
error = elants_i2c_execute_command(client,
get_resolution_cmd,
sizeof(get_resolution_cmd),
- resp, sizeof(resp));
- if (error) {
- dev_err(&client->dev, "get resolution command failed: %d\n",
- error);
+ resp, sizeof(resp), 1,
+ "get resolution");
+ if (error)
return error;
- }

rows = resp[2] + resp[6] + resp[10];
cols = resp[3] + resp[7] + resp[11];
@@ -465,36 +476,29 @@ static int elants_i2c_query_ts_info(struct elants_data *ts)
/* Process mm_to_pixel information */
error = elants_i2c_execute_command(client,
get_osr_cmd, sizeof(get_osr_cmd),
- resp, sizeof(resp));
- if (error) {
- dev_err(&client->dev, "get osr command failed: %d\n",
- error);
+ resp, sizeof(resp), 1, "get osr");
+ if (error)
return error;
- }

osr = resp[3];

error = elants_i2c_execute_command(client,
get_physical_scan_cmd,
sizeof(get_physical_scan_cmd),
- resp, sizeof(resp));
- if (error) {
- dev_err(&client->dev, "get physical scan command failed: %d\n",
- error);
+ resp, sizeof(resp), 1,
+ "get physical scan");
+ if (error)
return error;
- }

phy_x = get_unaligned_be16(&resp[2]);

error = elants_i2c_execute_command(client,
get_physical_drive_cmd,
sizeof(get_physical_drive_cmd),
- resp, sizeof(resp));
- if (error) {
- dev_err(&client->dev, "get physical drive command failed: %d\n",
- error);
+ resp, sizeof(resp), 1,
+ "get physical drive");
+ if (error)
return error;
- }

phy_y = get_unaligned_be16(&resp[2]);

@@ -649,11 +653,10 @@ static int elants_i2c_validate_remark_id(struct elants_data *ts,

/* Compare TS Remark ID and FW Remark ID */
error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
- resp, sizeof(resp));
- if (error) {
- dev_err(&client->dev, "failed to query Remark ID: %d\n", error);
+ resp, sizeof(resp),
+ 1, "read Remark ID");
+ if (error < 0)
return error;
- }

ts_remark_id = get_unaligned_be16(&resp[3]);

--
2.20.1

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