diff mbox series

[v3] power: supply: sbs-battery: cache constant string properties

Message ID 20210526132509.v3.1.I446881dabe094fff375847593be87ec2624f587f@changeid
State Accepted
Commit b49a81d0fd021a1f0c8660fa40ad9984d9d1f5b7
Headers show
Series [v3] power: supply: sbs-battery: cache constant string properties | expand

Commit Message

Ikjoon Jang May 26, 2021, 5:25 a.m. UTC 
Currently sbs-battery supports three string properties -
manufacturer, model_name, and chemistry. Buffers for those
properties are currently defined as global variables.

This patch moves those global variables into struct sbs_info
and cache/reuse them as they are all constant values.

Signed-off-by: Ikjoon Jang <ikjn@chromium.org>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>

---

Changes in v3:
- Invalidate cached properties upon update_presence(!present)
- Fix a bug in reading chemistry

Changes in v2:
- change function name of sbs_get_battery_string_property()
  to sbs_get_constant_string()
- use cached string properties
- use cached technology value in sbs_get_chemistry()

 drivers/power/supply/sbs-battery.c | 153 ++++++++++++++++++-----------
 1 file changed, 95 insertions(+), 58 deletions(-)

Comments

kernel test robot May 26, 2021, 8:37 a.m. UTC | #1 
Hi Ikjoon,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on power-supply/for-next]
[also build test WARNING on v5.13-rc3 next-20210525]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Ikjoon-Jang/power-supply-sbs-battery-cache-constant-string-properties/20210526-132701
base:   https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next
config: i386-randconfig-a015-20210526 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/584859e4c0fe02c3c7b9b4e8c4a2c99d5212fe21
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Ikjoon-Jang/power-supply-sbs-battery-cache-constant-string-properties/20210526-132701
        git checkout 584859e4c0fe02c3c7b9b4e8c4a2c99d5212fe21
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/power/supply/sbs-battery.c: In function 'sbs_invalidate_cached_props':
   drivers/power/supply/sbs-battery.c:1288: error: unterminated argument list invoking macro "if"
    1288 |    "Attempt to load the driver even if no battery is connected");
         | 
   drivers/power/supply/sbs-battery.c:1288: error: expected '(' at end of input
    1288 |    "Attempt to load the driver even if no battery is connected");
         | 
         |(
>> drivers/power/supply/sbs-battery.c:236:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     236 |   if (chip->strings[i][0] = 0;
         |   ^~
   drivers/power/supply/sbs-battery.c:1288: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    1288 |    "Attempt to load the driver even if no battery is connected");
         | 
   drivers/power/supply/sbs-battery.c:1288: note: '-Wmisleading-indentation' is disabled from this point onwards, since column-tracking was disabled due to the size of the code/headers
   drivers/power/supply/sbs-battery.c:236:3: error: expected declaration or statement at end of input
     236 |   if (chip->strings[i][0] = 0;
         |   ^~
   At top level:
   drivers/power/supply/sbs-battery.c:229:13: warning: 'sbs_invalidate_cached_props' defined but not used [-Wunused-function]
     229 | static void sbs_invalidate_cached_props(struct sbs_info *chip)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/power/supply/sbs-battery.c:217:14: warning: 'sbs_get_string_buf' defined but not used [-Wunused-function]
     217 | static char *sbs_get_string_buf(struct sbs_info *chip,
         |              ^~~~~~~~~~~~~~~~~~
   drivers/power/supply/sbs-battery.c:155:41: warning: 'sbs_properties' defined but not used [-Wunused-const-variable=]
     155 | static const enum power_supply_property sbs_properties[] = {
         |                                         ^~~~~~~~~~~~~~
   drivers/power/supply/sbs-battery.c:97:3: warning: 'sbs_data' defined but not used [-Wunused-const-variable=]
      97 | } sbs_data[] = {
         |   ^~~~~~~~


vim +/if +236 drivers/power/supply/sbs-battery.c

   228	
   229	static void sbs_invalidate_cached_props(struct sbs_info *chip)
   230	{
   231		int i = 0;
   232	
   233		chip->technology = -1;
   234	
   235		for (i = 0; i < NR_STRING_BUFFERS; i++)
 > 236			if (chip->strings[i][0] = 0;
   237	}
   238	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/power/supply/sbs-battery.c b/drivers/power/supply/sbs-battery.c
index b6a538ebb378..56eaef8c32fc 100644
--- a/drivers/power/supply/sbs-battery.c
+++ b/drivers/power/supply/sbs-battery.c
@@ -188,6 +188,14 @@  static const enum power_supply_property sbs_properties[] = {
 /* Supports special manufacturer commands from TI BQ20Z65 and BQ20Z75 IC. */
 #define SBS_FLAGS_TI_BQ20ZX5		BIT(0)
 
+static const enum power_supply_property string_properties[] = {
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+};
+
+#define NR_STRING_BUFFERS	ARRAY_SIZE(string_properties)
+
 struct sbs_info {
 	struct i2c_client		*client;
 	struct power_supply		*power_supply;
@@ -201,11 +209,32 @@  struct sbs_info {
 	struct delayed_work		work;
 	struct mutex			mode_lock;
 	u32				flags;
+	int				technology;
+	char				strings[NR_STRING_BUFFERS][I2C_SMBUS_BLOCK_MAX + 1];
 };
 
-static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
-static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
-static char chemistry[I2C_SMBUS_BLOCK_MAX + 1];
+static char *sbs_get_string_buf(struct sbs_info *chip,
+				enum power_supply_property psp)
+{
+	int i = 0;
+
+	for (i = 0; i < NR_STRING_BUFFERS; i++)
+		if (string_properties[i] == psp)
+			return chip->strings[i];
+
+	return ERR_PTR(-EINVAL);
+}
+
+static void sbs_invalidate_cached_props(struct sbs_info *chip)
+{
+	int i = 0;
+
+	chip->technology = -1;
+
+	for (i = 0; i < NR_STRING_BUFFERS; i++)
+		if (chip->strings[i][0] = 0;
+}
+
 static bool force_load;
 
 static int sbs_read_word_data(struct i2c_client *client, u8 address);
@@ -243,6 +272,7 @@  static int sbs_update_presence(struct sbs_info *chip, bool is_present)
 		chip->is_present = false;
 		/* Disable PEC when no device is present */
 		client->flags &= ~I2C_CLIENT_PEC;
+		sbs_invalidate_cached_props(chip);
 		return 0;
 	}
 
@@ -639,17 +669,45 @@  static int sbs_get_battery_property(struct i2c_client *client,
 	return 0;
 }
 
-static int sbs_get_battery_string_property(struct i2c_client *client,
-	int reg_offset, enum power_supply_property psp, char *val)
+static int sbs_get_property_index(struct i2c_client *client,
+	enum power_supply_property psp)
 {
-	s32 ret;
+	int count;
 
-	ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
+	for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
+		if (psp == sbs_data[count].psp)
+			return count;
 
-	if (ret < 0)
-		return ret;
+	dev_warn(&client->dev,
+		"%s: Invalid Property - %d\n", __func__, psp);
 
-	return 0;
+	return -EINVAL;
+}
+
+static const char *sbs_get_constant_string(struct sbs_info *chip,
+			enum power_supply_property psp)
+{
+	int ret;
+	char *buf;
+	u8 addr;
+
+	buf = sbs_get_string_buf(chip, psp);
+	if (IS_ERR(buf))
+		return buf;
+
+	if (!buf[0]) {
+		ret = sbs_get_property_index(chip->client, psp);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
+		addr = sbs_data[ret].addr;
+
+		ret = sbs_read_string_data(chip->client, addr, buf);
+		if (ret < 0)
+			return ERR_PTR(ret);
+	}
+
+	return buf;
 }
 
 static void  sbs_unit_adjustment(struct i2c_client *client,
@@ -772,48 +830,36 @@  static int sbs_get_battery_serial_number(struct i2c_client *client,
 	return 0;
 }
 
-static int sbs_get_property_index(struct i2c_client *client,
-	enum power_supply_property psp)
-{
-	int count;
-	for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
-		if (psp == sbs_data[count].psp)
-			return count;
-
-	dev_warn(&client->dev,
-		"%s: Invalid Property - %d\n", __func__, psp);
-
-	return -EINVAL;
-}
-
-static int sbs_get_chemistry(struct i2c_client *client,
+static int sbs_get_chemistry(struct sbs_info *chip,
 		union power_supply_propval *val)
 {
-	enum power_supply_property psp = POWER_SUPPLY_PROP_TECHNOLOGY;
-	int ret;
+	const char *chemistry;
 
-	ret = sbs_get_property_index(client, psp);
-	if (ret < 0)
-		return ret;
+	if (chip->technology != -1) {
+		val->intval = chip->technology;
+		return 0;
+	}
 
-	ret = sbs_get_battery_string_property(client, ret, psp,
-					      chemistry);
-	if (ret < 0)
-		return ret;
+	chemistry = sbs_get_constant_string(chip, POWER_SUPPLY_PROP_TECHNOLOGY);
+
+	if (IS_ERR(chemistry))
+		return PTR_ERR(chemistry);
 
 	if (!strncasecmp(chemistry, "LION", 4))
-		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+		chip->technology = POWER_SUPPLY_TECHNOLOGY_LION;
 	else if (!strncasecmp(chemistry, "LiP", 3))
-		val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
+		chip->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
 	else if (!strncasecmp(chemistry, "NiCd", 4))
-		val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
+		chip->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
 	else if (!strncasecmp(chemistry, "NiMH", 4))
-		val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
+		chip->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
 	else
-		val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+		chip->technology = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+
+	if (chip->technology == POWER_SUPPLY_TECHNOLOGY_UNKNOWN)
+		dev_warn(&chip->client->dev, "Unknown chemistry: %s\n", chemistry);
 
-	if (val->intval == POWER_SUPPLY_TECHNOLOGY_UNKNOWN)
-		dev_warn(&client->dev, "Unknown chemistry: %s\n", chemistry);
+	val->intval = chip->technology;
 
 	return 0;
 }
@@ -857,6 +903,7 @@  static int sbs_get_property(struct power_supply *psy,
 	int ret = 0;
 	struct sbs_info *chip = power_supply_get_drvdata(psy);
 	struct i2c_client *client = chip->client;
+	const char *str;
 
 	if (chip->gpio_detect) {
 		ret = gpiod_get_value_cansleep(chip->gpio_detect);
@@ -882,7 +929,7 @@  static int sbs_get_property(struct power_supply *psy,
 		break;
 
 	case POWER_SUPPLY_PROP_TECHNOLOGY:
-		ret = sbs_get_chemistry(client, val);
+		ret = sbs_get_chemistry(chip, val);
 		if (ret < 0)
 			break;
 
@@ -934,23 +981,12 @@  static int sbs_get_property(struct power_supply *psy,
 		break;
 
 	case POWER_SUPPLY_PROP_MODEL_NAME:
-		ret = sbs_get_property_index(client, psp);
-		if (ret < 0)
-			break;
-
-		ret = sbs_get_battery_string_property(client, ret, psp,
-						      model_name);
-		val->strval = model_name;
-		break;
-
 	case POWER_SUPPLY_PROP_MANUFACTURER:
-		ret = sbs_get_property_index(client, psp);
-		if (ret < 0)
-			break;
-
-		ret = sbs_get_battery_string_property(client, ret, psp,
-						      manufacturer);
-		val->strval = manufacturer;
+		str = sbs_get_constant_string(chip, psp);
+		if (IS_ERR(str))
+			ret = PTR_ERR(str);
+		else
+			val->strval = str;
 		break;
 
 	case POWER_SUPPLY_PROP_MANUFACTURE_YEAR:
@@ -1097,6 +1133,7 @@  static int sbs_probe(struct i2c_client *client)
 	psy_cfg.of_node = client->dev.of_node;
 	psy_cfg.drv_data = chip;
 	chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
+	sbs_invalidate_cached_props(chip);
 	mutex_init(&chip->mode_lock);
 
 	/* use pdata if available, fall back to DT properties,