max17042: Add POR init procedure from Maxim appnote

Add power on reset (POR) init procedure defined by the maxim
appnote. Using this procedure ensures that the part is
configured/initialized correctly at POR and improves early accuracy of
the fuel gauge and informs the fuel gauge with the battery
characterization parameters.  The battery characterization parameters
come from the maxim characterization procedure.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/include/linux/power/max17042_battery.h b/include/linux/power/max17042_battery.h
index 67eeada71073..e01b167e66f0 100644
--- a/include/linux/power/max17042_battery.h
+++ b/include/linux/power/max17042_battery.h
@@ -27,6 +27,8 @@
 #define MAX17042_BATTERY_FULL   (100)
 #define MAX17042_DEFAULT_SNS_RESISTOR   (10000)
 
+#define MAX17042_CHARACTERIZATION_DATA_SIZE 48
+
 enum max17042_register {
         MAX17042_STATUS         = 0x00,
         MAX17042_VALRT_Th       = 0x01,
@@ -124,10 +126,64 @@ struct max17042_reg_data {
         u16 data;
 };
 
+struct max17042_config_data {
+        /* External current sense resistor value in milli-ohms */
+        u32     cur_sense_val;
+
+        /* A/D measurement */
+        u16     tgain;          /* 0x2C */
+        u16     toff;           /* 0x2D */
+        u16     cgain;          /* 0x2E */
+        u16     coff;           /* 0x2F */
+
+        /* Alert / Status */
+        u16     valrt_thresh;   /* 0x01 */
+        u16     talrt_thresh;   /* 0x02 */
+        u16     soc_alrt_thresh;        /* 0x03 */
+        u16     config;         /* 0x01D */
+        u16     shdntimer;      /* 0x03F */
+
+        /* App data */
+        u16     design_cap;     /* 0x18 */
+        u16     ichgt_term;     /* 0x1E */
+
+        /* MG3 config */
+        u16     at_rate;        /* 0x04 */
+        u16     learn_cfg;      /* 0x28 */
+        u16     filter_cfg;     /* 0x29 */
+        u16     relax_cfg;      /* 0x2A */
+        u16     misc_cfg;       /* 0x2B */
+        u16     masksoc;        /* 0x32 */
+
+        /* MG3 save and restore */
+        u16     fullcap;        /* 0x10 */
+        u16     fullcapnom;     /* 0x23 */
+        u16     socempty;       /* 0x33 */
+        u16     lavg_empty;     /* 0x36 */
+        u16     dqacc;          /* 0x45 */
+        u16     dpacc;          /* 0x46 */
+
+        /* Cell technology from power_supply.h */
+        u16     cell_technology;
+
+        /* Cell Data */
+        u16     vempty;         /* 0x12 */
+        u16     temp_nom;       /* 0x24 */
+        u16     temp_lim;       /* 0x25 */
+        u16     fctc;           /* 0x37 */
+        u16     rcomp0;         /* 0x38 */
+        u16     tcompc0;        /* 0x39 */
+        u16     empty_tempco;   /* 0x3A */
+        u16     kempty0;        /* 0x3B */
+        u16     cell_char_tbl[MAX17042_CHARACTERIZATION_DATA_SIZE];
+} __packed;
+
 struct max17042_platform_data {
         struct max17042_reg_data *init_data;
+        struct max17042_config_data *config_data;
         int num_init_data; /* Number of enties in init_data array */
         bool enable_current_sense;
+        bool enable_por_init; /* Use POR init from Maxim appnote */
 
         /*
          * R_sns in micro-ohms.