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authorHans de Goede <hdegoede@redhat.com>2017-04-14 21:32:49 +0300
committerSebastian Reichel <sre@kernel.org>2017-05-01 13:37:25 +0300
commit917362135b8a5c0680acf08807e9fc6179eb6c79 (patch)
treebb20f3213be8e5e6aad36ab8ab333b7c1f1d85b8
parent2814913c3136b41084a896c90062bd9b87672dff (diff)
downloadlinux-917362135b8a5c0680acf08807e9fc6179eb6c79.tar.xz
power: supply: max17042_battery: Add default platform_data fallback data
Some x86 machines use a max17047 fuel-gauge and x86 might be missing platform_data if not provided by SFI. This commit adds default platform_data as fallback option so that the driver can work on boards where no platform_data is provided. Since not all boards have a thermistor hooked up, set temp_min to 0 and change the health checks from temp <= temp_min to temp < temp_min to not trigger on such boards (where temp reads 0). Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
-rw-r--r--drivers/power/supply/max17042_battery.c60
-rw-r--r--include/linux/power/max17042_battery.h6
2 files changed, 58 insertions, 8 deletions
diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
index a51b2965cd5c..f0ff6e880ff2 100644
--- a/drivers/power/supply/max17042_battery.c
+++ b/drivers/power/supply/max17042_battery.c
@@ -150,12 +150,12 @@ static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
if (ret < 0)
goto health_error;
- if (temp <= chip->pdata->temp_min) {
+ if (temp < chip->pdata->temp_min) {
*health = POWER_SUPPLY_HEALTH_COLD;
goto out;
}
- if (temp >= chip->pdata->temp_max) {
+ if (temp > chip->pdata->temp_max) {
*health = POWER_SUPPLY_HEALTH_OVERHEAT;
goto out;
}
@@ -772,8 +772,9 @@ static void max17042_init_worker(struct work_struct *work)
#ifdef CONFIG_OF
static struct max17042_platform_data *
-max17042_get_pdata(struct device *dev)
+max17042_get_pdata(struct max17042_chip *chip)
{
+ struct device *dev = &chip->client->dev;
struct device_node *np = dev->of_node;
u32 prop;
struct max17042_platform_data *pdata;
@@ -806,10 +807,55 @@ max17042_get_pdata(struct device *dev)
return pdata;
}
#else
+static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
+ /*
+ * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
+ * when the voltage FG reports 95%, as recommended in the datasheet.
+ */
+ { MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
+};
+
static struct max17042_platform_data *
-max17042_get_pdata(struct device *dev)
+max17042_get_pdata(struct max17042_chip *chip)
{
- return dev->platform_data;
+ struct device *dev = &chip->client->dev;
+ struct max17042_platform_data *pdata;
+ int ret, misc_cfg;
+
+ if (dev->platform_data)
+ return dev->platform_data;
+
+ /*
+ * The MAX17047 gets used on x86 where we might not have pdata, assume
+ * the firmware will already have initialized the fuel-gauge and provide
+ * default values for the non init bits to make things work.
+ */
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return pdata;
+
+ if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
+ pdata->init_data = max17047_default_pdata_init_regs;
+ pdata->num_init_data =
+ ARRAY_SIZE(max17047_default_pdata_init_regs);
+ }
+
+ ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
+ if (ret < 0)
+ return NULL;
+
+ /* If bits 0-1 are set to 3 then only Voltage readings are used */
+ if ((misc_cfg & 0x3) == 0x3)
+ pdata->enable_current_sense = false;
+ else
+ pdata->enable_current_sense = true;
+
+ pdata->vmin = MAX17042_DEFAULT_VMIN;
+ pdata->vmax = MAX17042_DEFAULT_VMAX;
+ pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
+ pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;
+
+ return pdata;
}
#endif
@@ -858,20 +904,20 @@ static int max17042_probe(struct i2c_client *client,
return -ENOMEM;
chip->client = client;
+ chip->chip_type = id->driver_data;
chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
if (IS_ERR(chip->regmap)) {
dev_err(&client->dev, "Failed to initialize regmap\n");
return -EINVAL;
}
- chip->pdata = max17042_get_pdata(&client->dev);
+ chip->pdata = max17042_get_pdata(chip);
if (!chip->pdata) {
dev_err(&client->dev, "no platform data provided\n");
return -EINVAL;
}
i2c_set_clientdata(client, chip);
- chip->chip_type = id->driver_data;
psy_cfg.drv_data = chip;
/* When current is not measured,
diff --git a/include/linux/power/max17042_battery.h b/include/linux/power/max17042_battery.h
index 522757ac9cd4..3489fb0f9099 100644
--- a/include/linux/power/max17042_battery.h
+++ b/include/linux/power/max17042_battery.h
@@ -24,8 +24,12 @@
#define __MAX17042_BATTERY_H_
#define MAX17042_STATUS_BattAbsent (1 << 3)
-#define MAX17042_BATTERY_FULL (100)
+#define MAX17042_BATTERY_FULL (95) /* Recommend. FullSOCThr value */
#define MAX17042_DEFAULT_SNS_RESISTOR (10000)
+#define MAX17042_DEFAULT_VMIN (3000)
+#define MAX17042_DEFAULT_VMAX (4500) /* LiHV cell max */
+#define MAX17042_DEFAULT_TEMP_MIN (0) /* For sys without temp sensor */
+#define MAX17042_DEFAULT_TEMP_MAX (700) /* 70 degrees Celcius */
#define MAX17042_CHARACTERIZATION_DATA_SIZE 48