abx500-chargalg: Add abx500 charging algorithm

This is a charging algorithm driver for abx500 variants. It is the central
entity for battery driver and is responsible for charging and monitoring
the battery driver. It is a hardware independant driver and also monitors
other abx500 power supply devices.

Signed-off-by: Arun Murthy <arun.murthy@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

2 files changed, 311 insertions, 0 deletions

diff --git a/include/linux/mfd/abx500.h b/include/linux/mfd/abx500.h
index 9970337ff04..8344196b000 100644
--- a/include/linux/mfd/abx500.h
+++ b/include/linux/mfd/abx500.h
@@ -152,6 +152,279 @@ struct abx500_init_settings {
         u8 setting;
 };
 
+/* Battery driver related data */
+/*
+ * ADC for the battery thermistor.
+ * When using the ABx500_ADC_THERM_BATCTRL the battery ID resistor is combined
+ * with a NTC resistor to both identify the battery and to measure its
+ * temperature. Different phone manufactures uses different techniques to both
+ * identify the battery and to read its temperature.
+ */
+enum abx500_adc_therm {
+        ABx500_ADC_THERM_BATCTRL,
+        ABx500_ADC_THERM_BATTEMP,
+};
+
+/**
+ * struct abx500_res_to_temp - defines one point in a temp to res curve. To
+ * be used in battery packs that combines the identification resistor with a
+ * NTC resistor.
+ * @temp:                       battery pack temperature in Celcius
+ * @resist:                     NTC resistor net total resistance
+ */
+struct abx500_res_to_temp {
+        int temp;
+        int resist;
+};
+
+/**
+ * struct abx500_v_to_cap - Table for translating voltage to capacity
+ * @voltage:            Voltage in mV
+ * @capacity:           Capacity in percent
+ */
+struct abx500_v_to_cap {
+        int voltage;
+        int capacity;
+};
+
+/* Forward declaration */
+struct abx500_fg;
+
+/**
+ * struct abx500_fg_parameters - Fuel gauge algorithm parameters, in seconds
+ * if not specified
+ * @recovery_sleep_timer:       Time between measurements while recovering
+ * @recovery_total_time:        Total recovery time
+ * @init_timer:                 Measurement interval during startup
+ * @init_discard_time:          Time we discard voltage measurement at startup
+ * @init_total_time:            Total init time during startup
+ * @high_curr_time:             Time current has to be high to go to recovery
+ * @accu_charging:              FG accumulation time while charging
+ * @accu_high_curr:             FG accumulation time in high current mode
+ * @high_curr_threshold:        High current threshold, in mA
+ * @lowbat_threshold:           Low battery threshold, in mV
+ * @overbat_threshold:          Over battery threshold, in mV
+ * @battok_falling_th_sel0      Threshold in mV for battOk signal sel0
+ *                              Resolution in 50 mV step.
+ * @battok_raising_th_sel1      Threshold in mV for battOk signal sel1
+ *                              Resolution in 50 mV step.
+ * @user_cap_limit              Capacity reported from user must be within this
+ *                              limit to be considered as sane, in percentage
+ *                              points.
+ * @maint_thres                 This is the threshold where we stop reporting
+ *                              battery full while in maintenance, in per cent
+ */
+struct abx500_fg_parameters {
+        int recovery_sleep_timer;
+        int recovery_total_time;
+        int init_timer;
+        int init_discard_time;
+        int init_total_time;
+        int high_curr_time;
+        int accu_charging;
+        int accu_high_curr;
+        int high_curr_threshold;
+        int lowbat_threshold;
+        int overbat_threshold;
+        int battok_falling_th_sel0;
+        int battok_raising_th_sel1;
+        int user_cap_limit;
+        int maint_thres;
+};
+
+/**
+ * struct abx500_charger_maximization - struct used by the board config.
+ * @use_maxi:           Enable maximization for this battery type
+ * @maxi_chg_curr:      Maximum charger current allowed
+ * @maxi_wait_cycles:   cycles to wait before setting charger current
+ * @charger_curr_step   delta between two charger current settings (mA)
+ */
+struct abx500_maxim_parameters {
+        bool ena_maxi;
+        int chg_curr;
+        int wait_cycles;
+        int charger_curr_step;
+};
+
+/**
+ * struct abx500_battery_type - different batteries supported
+ * @name:                       battery technology
+ * @resis_high:                 battery upper resistance limit
+ * @resis_low:                  battery lower resistance limit
+ * @charge_full_design:         Maximum battery capacity in mAh
+ * @nominal_voltage:            Nominal voltage of the battery in mV
+ * @termination_vol:            max voltage upto which battery can be charged
+ * @termination_curr            battery charging termination current in mA
+ * @recharge_vol                battery voltage limit that will trigger a new
+ *                              full charging cycle in the case where maintenan-
+ *                              -ce charging has been disabled
+ * @normal_cur_lvl:             charger current in normal state in mA
+ * @normal_vol_lvl:             charger voltage in normal state in mV
+ * @maint_a_cur_lvl:            charger current in maintenance A state in mA
+ * @maint_a_vol_lvl:            charger voltage in maintenance A state in mV
+ * @maint_a_chg_timer_h:        charge time in maintenance A state
+ * @maint_b_cur_lvl:            charger current in maintenance B state in mA
+ * @maint_b_vol_lvl:            charger voltage in maintenance B state in mV
+ * @maint_b_chg_timer_h:        charge time in maintenance B state
+ * @low_high_cur_lvl:           charger current in temp low/high state in mA
+ * @low_high_vol_lvl:           charger voltage in temp low/high state in mV'
+ * @battery_resistance:         battery inner resistance in mOhm.
+ * @n_r_t_tbl_elements:         number of elements in r_to_t_tbl
+ * @r_to_t_tbl:                 table containing resistance to temp points
+ * @n_v_cap_tbl_elements:       number of elements in v_to_cap_tbl
+ * @v_to_cap_tbl:               Voltage to capacity (in %) table
+ * @n_batres_tbl_elements       number of elements in the batres_tbl
+ * @batres_tbl                  battery internal resistance vs temperature table
+ */
+struct abx500_battery_type {
+        int name;
+        int resis_high;
+        int resis_low;
+        int charge_full_design;
+        int nominal_voltage;
+        int termination_vol;
+        int termination_curr;
+        int recharge_vol;
+        int normal_cur_lvl;
+        int normal_vol_lvl;
+        int maint_a_cur_lvl;
+        int maint_a_vol_lvl;
+        int maint_a_chg_timer_h;
+        int maint_b_cur_lvl;
+        int maint_b_vol_lvl;
+        int maint_b_chg_timer_h;
+        int low_high_cur_lvl;
+        int low_high_vol_lvl;
+        int battery_resistance;
+        int n_temp_tbl_elements;
+        struct abx500_res_to_temp *r_to_t_tbl;
+        int n_v_cap_tbl_elements;
+        struct abx500_v_to_cap *v_to_cap_tbl;
+        int n_batres_tbl_elements;
+        struct batres_vs_temp *batres_tbl;
+};
+
+/**
+ * struct abx500_bm_capacity_levels - abx500 capacity level data
+ * @critical:           critical capacity level in percent
+ * @low:                low capacity level in percent
+ * @normal:             normal capacity level in percent
+ * @high:               high capacity level in percent
+ * @full:               full capacity level in percent
+ */
+struct abx500_bm_capacity_levels {
+        int critical;
+        int low;
+        int normal;
+        int high;
+        int full;
+};
+
+/**
+ * struct abx500_bm_charger_parameters - Charger specific parameters
+ * @usb_volt_max:       maximum allowed USB charger voltage in mV
+ * @usb_curr_max:       maximum allowed USB charger current in mA
+ * @ac_volt_max:        maximum allowed AC charger voltage in mV
+ * @ac_curr_max:        maximum allowed AC charger current in mA
+ */
+struct abx500_bm_charger_parameters {
+        int usb_volt_max;
+        int usb_curr_max;
+        int ac_volt_max;
+        int ac_curr_max;
+};
+
+/**
+ * struct abx500_bm_data - abx500 battery management data
+ * @temp_under          under this temp, charging is stopped
+ * @temp_low            between this temp and temp_under charging is reduced
+ * @temp_high           between this temp and temp_over charging is reduced
+ * @temp_over           over this temp, charging is stopped
+ * @temp_now            present battery temperature
+ * @temp_interval_chg   temperature measurement interval in s when charging
+ * @temp_interval_nochg temperature measurement interval in s when not charging
+ * @main_safety_tmr_h   safety timer for main charger
+ * @usb_safety_tmr_h    safety timer for usb charger
+ * @bkup_bat_v          voltage which we charge the backup battery with
+ * @bkup_bat_i          current which we charge the backup battery with
+ * @no_maintenance      indicates that maintenance charging is disabled
+ * @abx500_adc_therm    placement of thermistor, batctrl or battemp adc
+ * @chg_unknown_bat     flag to enable charging of unknown batteries
+ * @enable_overshoot    flag to enable VBAT overshoot control
+ * @auto_trig           flag to enable auto adc trigger
+ * @fg_res              resistance of FG resistor in 0.1mOhm
+ * @n_btypes            number of elements in array bat_type
+ * @batt_id             index of the identified battery in array bat_type
+ * @interval_charging   charge alg cycle period time when charging (sec)
+ * @interval_not_charging charge alg cycle period time when not charging (sec)
+ * @temp_hysteresis     temperature hysteresis
+ * @gnd_lift_resistance Battery ground to phone ground resistance (mOhm)
+ * @maxi:               maximization parameters
+ * @cap_levels          capacity in percent for the different capacity levels
+ * @bat_type            table of supported battery types
+ * @chg_params          charger parameters
+ * @fg_params           fuel gauge parameters
+ */
+struct abx500_bm_data {
+        int temp_under;
+        int temp_low;
+        int temp_high;
+        int temp_over;
+        int temp_now;
+        int temp_interval_chg;
+        int temp_interval_nochg;
+        int main_safety_tmr_h;
+        int usb_safety_tmr_h;
+        int bkup_bat_v;
+        int bkup_bat_i;
+        bool no_maintenance;
+        bool chg_unknown_bat;
+        bool enable_overshoot;
+        bool auto_trig;
+        enum abx500_adc_therm adc_therm;
+        int fg_res;
+        int n_btypes;
+        int batt_id;
+        int interval_charging;
+        int interval_not_charging;
+        int temp_hysteresis;
+        int gnd_lift_resistance;
+        const struct abx500_maxim_parameters *maxi;
+        const struct abx500_bm_capacity_levels *cap_levels;
+        const struct abx500_battery_type *bat_type;
+        const struct abx500_bm_charger_parameters *chg_params;
+        const struct abx500_fg_parameters *fg_params;
+};
+
+struct abx500_chargalg_platform_data {
+        char **supplied_to;
+        size_t num_supplicants;
+};
+
+struct abx500_charger_platform_data {
+        char **supplied_to;
+        size_t num_supplicants;
+        bool autopower_cfg;
+};
+
+struct abx500_btemp_platform_data {
+        char **supplied_to;
+        size_t num_supplicants;
+};
+
+struct abx500_fg_platform_data {
+        char **supplied_to;
+        size_t num_supplicants;
+};
+
+struct abx500_bm_plat_data {
+        struct abx500_bm_data *battery;
+        struct abx500_charger_platform_data *charger;
+        struct abx500_btemp_platform_data *btemp;
+        struct abx500_fg_platform_data *fg;
+        struct abx500_chargalg_platform_data *chargalg;
+};
+
 int abx500_set_register_interruptible(struct device *dev, u8 bank, u8 reg,
         u8 value);
 int abx500_get_register_interruptible(struct device *dev, u8 bank, u8 reg,
diff --git a/include/linux/mfd/abx500/ux500_chargalg.h b/include/linux/mfd/abx500/ux500_chargalg.h
new file mode 100644
index 00000000000..9b07725750c
--- /dev/null
+++ b/include/linux/mfd/abx500/ux500_chargalg.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2012
+ * Author: Johan Gardsmark <johan.gardsmark@stericsson.com> for ST-Ericsson.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#ifndef _UX500_CHARGALG_H
+#define _UX500_CHARGALG_H
+
+#include <linux/power_supply.h>
+
+#define psy_to_ux500_charger(x) container_of((x), \
+                struct ux500_charger, psy)
+
+/* Forward declaration */
+struct ux500_charger;
+
+struct ux500_charger_ops {
+        int (*enable) (struct ux500_charger *, int, int, int);
+        int (*kick_wd) (struct ux500_charger *);
+        int (*update_curr) (struct ux500_charger *, int);
+};
+
+/**
+ * struct ux500_charger - power supply ux500 charger sub class
+ * @psy                 power supply base class
+ * @ops                 ux500 charger operations
+ * @max_out_volt        maximum output charger voltage in mV
+ * @max_out_curr        maximum output charger current in mA
+ */
+struct ux500_charger {
+        struct power_supply psy;
+        struct ux500_charger_ops ops;
+        int max_out_volt;
+        int max_out_curr;
+};
+
+#endif