Messages in this thread Patch in this message | | | From | Jenny TC <> | Subject | [PATCH 7/7] power_supply: Introduce PSE compliant algorithm | Date | Thu, 18 Oct 2012 22:14:06 +0530 |
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As per PSE standard the battery characteristics and thereby the charging rates can vary on different temperature zones. This patch introduces a PSE compliant charging algorithm with maintenance charging support. The algorithm can be selected by the charging framework based on the type of the battery charging profile.
Signed-off-by: Jenny TC <jenny.tc@intel.com> --- drivers/power/Kconfig | 12 ++++++ drivers/power/Makefile | 1 + drivers/power/charging_algo_pse.c | 79 +++++++++++++++++++++++++++++++++++++ include/linux/power/battery_id.h | 47 ++++++++++++++++++++++ 4 files changed, 139 insertions(+) create mode 100644 drivers/power/charging_algo_pse.c
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 34850e4..e09be69 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -16,6 +16,18 @@ config POWER_SUPPLY_CHARGER drivers to keep the charging logic outside and the charger driver just need to abstract the charger hardware +config POWER_SUPPLY_CHARGING_ALGO_PSE + bool "PSE compliant charging algorithm" + help + Say Y here to select PSE compliant charging algorithm. As per PSE + standard the battery characteristics and thereby the charging rates + can vary on different temperature zones. This config will enable PSE + compliant charging algorithm with maintenance charging support. The + algorithm can be selected by the charging framework based on the type + of the battery charging profile. + + depends on POWER_SUPPLY_CHARGER + config POWER_SUPPLY_BATTID bool "Power Supply Battery Identification Framework" help diff --git a/drivers/power/Makefile b/drivers/power/Makefile index ce8c230..8b250b2 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -8,6 +8,7 @@ power_supply-$(CONFIG_POWER_SUPPLY_BATTID) += battery_id.o obj-$(CONFIG_POWER_SUPPLY) += power_supply.o obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o +obj-$(CONFIG_POWER_SUPPLY_CHARGING_ALGO_PSE) += charging_algo_pse.o obj-$(CONFIG_PDA_POWER) += pda_power.o obj-$(CONFIG_APM_POWER) += apm_power.o diff --git a/drivers/power/charging_algo_pse.c b/drivers/power/charging_algo_pse.c new file mode 100644 index 0000000..66feff8 --- /dev/null +++ b/drivers/power/charging_algo_pse.c @@ -0,0 +1,79 @@ +#define DEBUG +#include <linux/module.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/power_supply.h> +#include <linux/thermal.h> +#include <linux/power/battery_id.h> +#include "power_supply.h" +#include "power_supply_charger.h" + +static int get_tempzone(struct ps_pse_mod_prof *pse_mod_bprof, + int temp) +{ + + int i = 0; + int temp_range_cnt = pse_mod_bprof->temp_mon_ranges; + + if (temp < pse_mod_bprof->temp_low_lim + || temp > + pse_mod_bprof->temp_mon_range[0].temp_up_lim) + return -EINVAL; + + for (i = 0; i < temp_range_cnt; ++i) + if (temp <= pse_mod_bprof->temp_mon_range[i].temp_up_lim) + break; + return i; +} + +static int pse_get_next_cc_cv(struct batt_props bat_prop, + struct ps_batt_chg_prof bprof, unsigned long *cc, unsigned long *cv) +{ + int tzone; + struct ps_pse_mod_prof *pse_mod_bprof; + + + if (bprof.chrg_prof_type != PSE_MOD_CHRG_PROF) + return -EINVAL; + + pse_mod_bprof = (struct ps_pse_mod_prof *) bprof.batt_prof; + + if (!pse_mod_bprof) + return -EINVAL; + + tzone = get_tempzone(pse_mod_bprof, bat_prop.temperature); + + if (tzone < 0) + return -ENODATA; + + /* read cc and cv based on temperature and battery status*/ + + *cc = pse_mod_bprof->temp_mon_range[tzone].full_chrg_cur; + if (bat_prop.status == POWER_SUPPLY_STATUS_FULL) + *cv = pse_mod_bprof->temp_mon_range[tzone].maint_chrg_vol_ul; + else + *cv = pse_mod_bprof->temp_mon_range[tzone].full_chrg_vol; + + /* Software full detection: Set cc and cv to zero if FULL battery + * condition is met + */ + if ((bat_prop.current_now <= pse_mod_bprof->chrg_term_mA) && + (pse_mod_bprof->temp_mon_range[tzone].full_chrg_vol >= cv)) + *cc = *cv = 0; + return 0; +} + +static int __init pse_algo_init(void) +{ + struct charging_algo pse_algo; + pse_algo.chrg_prof_type = PSE_MOD_CHRG_PROF; + pse_algo.name = "pse_algo"; + pse_algo.get_next_cc_cv = pse_get_next_cc_cv; + power_supply_register_charging_algo(&pse_algo); + return 0; +} + +module_init(pse_algo_init); diff --git a/include/linux/power/battery_id.h b/include/linux/power/battery_id.h index 9a4832e..860a8b8 100644 --- a/include/linux/power/battery_id.h +++ b/include/linux/power/battery_id.h @@ -33,12 +33,59 @@ enum { POWER_SUPPLY_BATTERY_INSERTED, }; +enum batt_chrg_prof_type { + PSE_MOD_CHRG_PROF = 0, +}; + /* charging profile structure definition */ struct ps_batt_chg_prof { enum batt_chrg_prof_type chrg_prof_type; void *batt_prof; }; +/* PSE Modified Algo Structure */ +/* Parameters defining the charging range */ +struct ps_temp_chg_table { + /* upper temperature limit for each zone */ + short int temp_up_lim; + /* charge current and voltage */ + short int full_chrg_vol; + short int full_chrg_cur; + /* maintenance thresholds */ + /* maintenance lower threshold. Once battery hits full, charging + * charging will be resumed when battery voltage <= this voltage + */ + short int maint_chrg_vol_ll; + /* Charge current and voltage in maintenance mode */ + short int maint_chrg_vol_ul; + short int maint_chrg_cur; +} __packed; + + +#define BATTID_STR_LEN 8 +#define BATT_TEMP_NR_RNG 6 +/* Charging Profile */ +struct ps_pse_mod_prof { + /* battery id */ + char batt_id[BATTID_STR_LEN]; + /* type of battery */ + u16 battery_type; + u16 capacity; + u16 voltage_max; + /* charge termination current */ + u16 chrg_term_mA; + /* Low battery level voltage */ + u16 low_batt_mV; + /* upper and lower temperature limits on discharging */ + u8 disch_tmp_ul; + u8 disch_tmp_ll; + /* number of temperature monitoring ranges */ + u8 temp_mon_ranges; + struct ps_temp_chg_table temp_mon_range[BATT_TEMP_NR_RNG]; + /* Lowest temperature supported */ + short int temp_low_lim; +} __packed; + /*For notification during battery change event*/ extern struct atomic_notifier_head batt_id_notifier; -- 1.7.9.5
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