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>

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