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Date: Thu, 18 Oct 2012 22:14:06 +0530
From: Jenny TC <jenny.tc@...el.com>
To: Anton Vorontsov <anton.vorontsov@...aro.org>,
Anton Vorontsov <cbouatmailru@...il.com>,
linux-kernel@...r.kernel.org
Cc: Pallala Ramakrishna <ramakrishna.pallala@...el.com>,
Chanwoo Choi <cw00.choi@...sung.com>, myungjoo.ham@...sung.com,
Jenny TC <jenny.tc@...el.com>
Subject: [PATCH 7/7] power_supply: Introduce PSE compliant algorithm
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@...el.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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