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Subject[RFC PATCH 2/2] Add Dialog DA9030 battery charger driver
Driver for battery charger integrated into Dialog Semiconductor DA9030 PMIC



Signed-off-by: Mike Rapoport <mike@compulab.co.il>

drivers/power/Kconfig | 7 +
drivers/power/Makefile | 1 +
drivers/power/da9030_battery.c | 592 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 600 insertions(+), 0 deletions(-)
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 8e0c2b4..db8145c 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -68,4 +68,11 @@ config BATTERY_BQ27x00
help
Say Y here to enable support for batteries with BQ27200(I2C) chip.

+config BATTERY_DA903X
+ tristate "DA903x battery driver"
+ depends on PMIC_DA903X
+ help
+ Say Y here to enable support for batteries charger integrated into
+ DA9030/DA9030 PMICs.
+
endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index e8f1ece..58d1b46 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -23,3 +23,4 @@ obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o
obj-$(CONFIG_BATTERY_TOSA) += tosa_battery.o
obj-$(CONFIG_BATTERY_WM97XX) += wm97xx_battery.o
obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
+obj-$(CONFIG_BATTERY_DA903X) += da903x_battery.o
diff --git a/drivers/power/da9030_battery.c b/drivers/power/da9030_battery.c
new file mode 100644
index 0000000..2dd9fef
--- /dev/null
+++ b/drivers/power/da9030_battery.c
@@ -0,0 +1,592 @@
+/*
+ * Battery charger driver for Dialog Semiconductor DA9030
+ *
+ * Copyright (C) 2008 Compulab, Ltd.
+ * Mike Rapoport <mike@compulab.co.il>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/da903x.h>
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#endif
+
+#define DA9030_STATUS_CHDET (1 << 3)
+
+#define DA9030_FAULT_LOG 0x0a
+#define DA9030_FAULT_LOG_OVER_TEMP (1 << 7)
+#define DA9030_FAULT_LOG_VBAT_OVER (1 << 4)
+
+#define DA9030_CHARGE_CONTROL 0x28
+#define DA9030_CHRG_CHARGER_ENABLE (1 << 7)
+
+#define DA9030_ADC_MAN_CONTROL 0x30
+#define DA9030_ADC_TBATREF_ENABLE (1 << 5)
+#define DA9030_ADC_LDO_INT_ENABLE (1 << 4)
+
+#define DA9030_ADC_AUTO_CONTROL 0x31
+#define DA9030_ADC_TBAT_ENABLE (1 << 5)
+#define DA9030_ADC_VBAT_IN_TXON (1 << 4)
+#define DA9030_ADC_VCH_ENABLE (1 << 3)
+#define DA9030_ADC_ICH_ENABLE (1 << 2)
+#define DA9030_ADC_VBAT_ENABLE (1 << 1)
+#define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0)
+
+#define DA9030_VBATMON 0x32
+#define DA9030_VBATMONTXON 0x33
+#define DA9030_TBATHIGHP 0x34
+#define DA9030_TBATHIGHN 0x35
+#define DA9030_TBATLOW 0x36
+
+#define DA9030_VBAT_RES 0x41
+#define DA9030_VBATMIN_RES 0x42
+#define DA9030_VBATMINTXON_RES 0x43
+#define DA9030_ICHMAX_RES 0x44
+#define DA9030_ICHMIN_RES 0x45
+#define DA9030_ICHAVERAGE_RES 0x46
+#define DA9030_VCHMAX_RES 0x47
+#define DA9030_VCHMIN_RES 0x48
+#define DA9030_TBAT_RES 0x49
+
+struct da9030_adc_res {
+ uint8_t vbat_res;
+ uint8_t vbatmin_res;
+ uint8_t vbatmintxon;
+ uint8_t ichmax_res;
+ uint8_t ichmin_res;
+ uint8_t ichaverage_res;
+ uint8_t vchmax_res;
+ uint8_t vchmin_res;
+ uint8_t tbat_res;
+ uint8_t adc_in4_res;
+ uint8_t adc_in5_res;
+};
+
+struct da9030_battery_thresholds {
+ int tbat_low;
+ int tbat_high;
+ int tbat_restart;
+
+ int vbat_low;
+ int vbat_crit;
+ int vbat_charge_start;
+ int vbat_charge_stop;
+ int vbat_charge_restart;
+
+ int vcharge_min;
+ int vcharge_max;
+};
+
+struct da9030_charger {
+ struct power_supply psy;
+
+ struct device *master;
+
+ struct da9030_adc_res adc;
+ struct delayed_work work;
+ unsigned int interval;
+
+ struct power_supply_info *battery_info;
+
+ struct da9030_battery_thresholds thresholds;
+
+ unsigned int charge_milliamp;
+ unsigned int charge_millivolt;
+
+ /* charger status */
+ int chdet:1;
+ uint8_t fault;
+ int mA;
+ int mV;
+ int is_on;
+
+ struct notifier_block nb;
+
+ /* platform callbacks for battery low and critical events */
+ void (*battery_low)(void);
+ void (*battery_critical)(void);
+
+#ifdef CONFIG_DEBUG_FS
+ struct dentry *debug_file;
+#endif
+};
+
+#ifdef CONFIG_DEBUG_FS
+
+static inline int da9030_reg_to_mV(int reg)
+{
+ return ((reg * 2650) >> 8) + 2650;
+}
+
+static inline int da9030_millivolt_to_reg(int mV)
+{
+ return ((mV - 2650) << 8) / 2650;
+}
+
+static inline int da9030_reg_to_mA(int reg)
+{
+ return ((reg * 24000) >> 8) / 15;
+}
+
+static int bat_debug_show(struct seq_file *s, void *data)
+{
+ struct da9030_charger *charger = s->private;
+
+ seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off");
+ if (charger->chdet) {
+ seq_printf(s, "iset = %dmA, vset = %dmV\n",
+ charger->mA, charger->mV);
+ }
+
+ seq_printf(s, "vbat_res = %d (%dmV)\n",
+ charger->adc.vbat_res,
+ da9030_reg_to_mV(charger->adc.vbat_res));
+ seq_printf(s, "vbatmin_res = %d (%dmV)\n",
+ charger->adc.vbatmin_res,
+ da9030_reg_to_mV(charger->adc.vbatmin_res));
+ seq_printf(s, "vbatmintxon = %d (%dmV)\n",
+ charger->adc.vbatmintxon,
+ da9030_reg_to_mV(charger->adc.vbatmintxon));
+ seq_printf(s, "ichmax_res = %d (%dmA)\n",
+ charger->adc.ichmax_res,
+ da9030_reg_to_mV(charger->adc.ichmax_res));
+ seq_printf(s, "ichmin_res = %d (%dmA)\n",
+ charger->adc.ichmin_res,
+ da9030_reg_to_mA(charger->adc.ichmin_res));
+ seq_printf(s, "ichaverage_res = %d (%dmA)\n",
+ charger->adc.ichaverage_res,
+ da9030_reg_to_mA(charger->adc.ichaverage_res));
+ seq_printf(s, "vchmax_res = %d (%dmV)\n",
+ charger->adc.vchmax_res,
+ da9030_reg_to_mA(charger->adc.vchmax_res));
+ seq_printf(s, "vchmin_res = %d (%dmV)\n",
+ charger->adc.vchmin_res,
+ da9030_reg_to_mV(charger->adc.vchmin_res));
+
+ return 0;
+}
+
+static int debug_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, bat_debug_show, inode->i_private);
+}
+
+static const struct file_operations bat_debug_fops = {
+ .open = debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
+{
+ charger->debug_file = debugfs_create_file("charger", 0666, 0, charger,
+ &bat_debug_fops);
+ return charger->debug_file;
+}
+
+static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
+{
+ debugfs_remove(charger->debug_file);
+}
+#else
+#define da9030_bat_create_debugfs(x) NULL
+#define da9030_bat_remove_debugfs(x) do {} while (0)
+#endif
+
+static inline void da9030_read_adc(struct da9030_charger *charger,
+ struct da9030_adc_res *adc)
+{
+ da903x_reads(charger->master, DA9030_VBAT_RES,
+ sizeof(*adc), (uint8_t *)adc);
+}
+
+static void da9030_charger_update_state(struct da9030_charger *charger)
+{
+ uint8_t val;
+
+ da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val);
+ charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0;
+ charger->mA = ((val >> 3) & 0xf) * 100;
+ charger->mV = (val & 0x7) * 50 + 4000;
+
+ da9030_read_adc(charger, &charger->adc);
+ da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault);
+ charger->chdet = da903x_query_status(charger->master,
+ DA9030_STATUS_CHDET);
+}
+
+static void da9030_set_charge(struct da9030_charger *charger, int on)
+{
+ uint8_t val = 0;
+
+ if (on) {
+ val = DA9030_CHRG_CHARGER_ENABLE;
+ val |= (charger->charge_milliamp / 100) << 3;
+ val |= (charger->charge_millivolt - 4000) / 50;
+ charger->is_on = 1;
+ } else {
+ val = 0;
+ charger->is_on = 0;
+ }
+
+ da903x_write(charger->master, DA9030_CHARGE_CONTROL, val);
+}
+
+static void da9030_charger_check_state(struct da9030_charger *charger)
+{
+ da9030_charger_update_state(charger);
+
+ /* we wake or boot with external power on */
+ if (!charger->is_on) {
+ if ((charger->chdet) &&
+ (charger->adc.vbat_res <
+ charger->thresholds.vbat_charge_start)) {
+ da9030_set_charge(charger, 1);
+ }
+ } else {
+ if (charger->adc.vbat_res >=
+ charger->thresholds.vbat_charge_stop) {
+ da9030_set_charge(charger, 0);
+ da903x_write(charger->master, DA9030_VBATMON,
+ charger->thresholds.vbat_charge_restart);
+ } else if (charger->adc.vbat_res >
+ charger->thresholds.vbat_low) {
+ /* we are charging and passed LOW_THRESH,
+ so upate DA9030 VBAT threshold
+ */
+ da903x_write(charger->master, DA9030_VBATMON,
+ charger->thresholds.vbat_low);
+ }
+ if (charger->adc.vchmax_res > charger->thresholds.vcharge_max ||
+ charger->adc.vchmin_res < charger->thresholds.vcharge_min ||
+ /* Tempreture readings are negative */
+ charger->adc.tbat_res < charger->thresholds.tbat_high ||
+ charger->adc.tbat_res > charger->thresholds.tbat_low) {
+ /* disable charger */
+ da9030_set_charge(charger, 0);
+ }
+ }
+}
+
+static void da9030_charging_monitor(struct work_struct *work)
+{
+ struct da9030_charger *charger;
+
+ charger = container_of(work, struct da9030_charger, work.work);
+
+ da9030_charger_check_state(charger);
+
+ /* reschedule for the next time */
+ schedule_delayed_work(&charger->work, charger->interval);
+}
+
+static enum power_supply_property da9030_battery_props[] = {
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+};
+
+static void da9030_battery_check_status(struct da9030_charger *charger,
+ union power_supply_propval *val)
+{
+ if (charger->chdet) {
+ if (charger->is_on)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ } else {
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ }
+}
+
+static void da9030_battery_check_health(struct da9030_charger *charger,
+ union power_supply_propval *val)
+{
+ if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP)
+ val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER)
+ val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+}
+
+static int da9030_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct da9030_charger *charger;
+ charger = container_of(psy, struct da9030_charger, psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ da9030_battery_check_status(charger, val);
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ da9030_battery_check_health(charger, val);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = charger->battery_info->technology;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = charger->battery_info->voltage_max_design;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = charger->battery_info->voltage_min_design;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ val->intval =
+ da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000;
+ break;
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = charger->battery_info->name;
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static void da9030_battery_vbat_event(struct da9030_charger *charger)
+{
+ da9030_read_adc(charger, &charger->adc);
+
+ if (!charger->is_on) {
+ if (charger->adc.vbat_res < charger->thresholds.vbat_low) {
+ /* set VBAT threshold for critical */
+ da903x_write(charger->master, DA9030_VBATMON,
+ charger->thresholds.vbat_crit);
+ if (charger->battery_low)
+ charger->battery_low();
+ } else if (charger->adc.vbat_res <
+ charger->thresholds.vbat_crit) {
+ /* notify the system of battery critical */
+ if (charger->battery_critical)
+ charger->battery_critical();
+ }
+ }
+}
+
+static int da9030_battery_event(struct notifier_block *nb, unsigned long event,
+ void *data)
+{
+ struct da9030_charger *charger =
+ container_of(nb, struct da9030_charger, nb);
+ int status;
+
+ switch (event) {
+ case DA9030_EVENT_CHDET:
+ status = da903x_query_status(charger->master,
+ DA9030_STATUS_CHDET);
+ da9030_set_charge(charger, status);
+ break;
+ case DA9030_EVENT_VBATMON:
+ da9030_battery_vbat_event(charger);
+ break;
+ case DA9030_EVENT_CHIOVER:
+ case DA9030_EVENT_TBAT:
+ da9030_set_charge(charger, 0);
+ break;
+ }
+
+ return 0;
+}
+
+static void da9030_battery_convert_thresholds(struct da9030_charger *charger,
+ struct da9030_battery_info *pdata)
+{
+ charger->thresholds.tbat_low = pdata->tbat_low;
+ charger->thresholds.tbat_high = pdata->tbat_high;
+ charger->thresholds.tbat_restart = pdata->tbat_restart;
+
+ charger->thresholds.vbat_low =
+ da9030_millivolt_to_reg(pdata->vbat_low);
+ charger->thresholds.vbat_crit =
+ da9030_millivolt_to_reg(pdata->vbat_crit);
+ charger->thresholds.vbat_charge_start =
+ da9030_millivolt_to_reg(pdata->vbat_charge_start);
+ charger->thresholds.vbat_charge_stop =
+ da9030_millivolt_to_reg(pdata->vbat_charge_stop);
+ charger->thresholds.vbat_charge_restart =
+ da9030_millivolt_to_reg(pdata->vbat_charge_restart);
+
+ charger->thresholds.vcharge_min =
+ da9030_millivolt_to_reg(pdata->vcharge_min);
+ charger->thresholds.vcharge_max =
+ da9030_millivolt_to_reg(pdata->vcharge_max);
+}
+
+static void da9030_battery_setup_psy(struct da9030_charger *charger)
+{
+ struct power_supply *psy = &charger->psy;
+ struct power_supply_info *info = charger->battery_info;
+
+ psy->name = info->name;
+ psy->use_for_apm = info->use_for_apm;
+ psy->type = POWER_SUPPLY_TYPE_BATTERY;
+ psy->get_property = da9030_battery_get_property;
+
+ psy->properties = da9030_battery_props;
+ psy->num_properties = ARRAY_SIZE(da9030_battery_props);;
+};
+
+static int da9030_battery_charger_init(struct da9030_charger *charger)
+{
+ char v[5];
+ int ret;
+
+ v[0] = v[1] = charger->thresholds.vbat_low;
+ v[2] = charger->thresholds.tbat_high;
+ v[3] = charger->thresholds.tbat_restart;
+ v[4] = charger->thresholds.tbat_low;
+
+ ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v);
+ if (ret)
+ return ret;
+
+ /* enable reference voltage supply for ADC from the LDO_INTERNAL
+ regulator. Must be set before ADC measurements can be made. */
+ ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL,
+ DA9030_ADC_LDO_INT_ENABLE |
+ DA9030_ADC_TBATREF_ENABLE);
+ if (ret)
+ return ret;
+
+ /* enable auto ADC measuremnts */
+ return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL,
+ DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON |
+ DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE |
+ DA9030_ADC_VBAT_ENABLE |
+ DA9030_ADC_AUTO_SLEEP_ENABLE);
+}
+
+static int da9030_battery_probe(struct platform_device *pdev)
+{
+ struct da9030_charger *charger;
+ struct da9030_battery_info *pdata = pdev->dev.platform_data;
+ int ret;
+
+ if (pdata == NULL)
+ return -EINVAL;
+
+ if (pdata->charge_milliamp >= 1500 ||
+ pdata->charge_millivolt < 4000 ||
+ pdata->charge_millivolt > 4350)
+ return -EINVAL;
+
+ charger = kzalloc(sizeof(*charger), GFP_KERNEL);
+ if (charger == NULL)
+ return -ENOMEM;
+
+ charger->master = pdev->dev.parent;
+
+ /* 10 seconds between monotor runs unless platfrom defines other
+ interval */
+ charger->interval = msecs_to_jiffies(
+ (pdata->batmon_interval ? : 10) * 1000);
+
+ charger->charge_milliamp = pdata->charge_milliamp;
+ charger->charge_millivolt = pdata->charge_millivolt;
+ charger->battery_info = pdata->battery_info;
+ charger->battery_low = pdata->battery_low;
+ charger->battery_critical = pdata->battery_critical;
+
+ da9030_battery_convert_thresholds(charger, pdata);
+
+ ret = da9030_battery_charger_init(charger);
+ if (ret)
+ goto err_charger_init;
+
+ INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor);
+ schedule_delayed_work(&charger->work, charger->interval);
+
+ charger->nb.notifier_call = da9030_battery_event;
+ ret = da903x_register_notifier(charger->master, &charger->nb,
+ DA9030_EVENT_CHDET |
+ DA9030_EVENT_VBATMON |
+ DA9030_EVENT_CHIOVER |
+ DA9030_EVENT_TBAT);
+ if (ret)
+ goto err_notifier;
+
+ da9030_battery_setup_psy(charger);
+ ret = power_supply_register(&pdev->dev, &charger->psy);
+ if (ret)
+ goto err_ps_register;
+
+ charger->debug_file = da9030_bat_create_debugfs(charger);
+ platform_set_drvdata(pdev, charger);
+ return 0;
+
+err_ps_register:
+ da903x_unregister_notifier(charger->master, &charger->nb,
+ DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
+ DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
+err_notifier:
+ cancel_delayed_work(&charger->work);
+
+err_charger_init:
+ kfree(charger);
+
+ return ret;
+}
+
+static int da9030_battery_remove(struct platform_device *dev)
+{
+ struct da9030_charger *charger = platform_get_drvdata(dev);
+
+ da9030_bat_remove_debugfs(charger);
+
+ da903x_unregister_notifier(charger->master, &charger->nb,
+ DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON |
+ DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT);
+ cancel_delayed_work(&charger->work);
+ power_supply_unregister(&charger->psy);
+
+ kfree(charger);
+
+ return 0;
+}
+
+static struct platform_driver da903x_battery_driver = {
+ .driver = {
+ .name = "da903x-battery",
+ .owner = THIS_MODULE,
+ },
+ .probe = da9030_battery_probe,
+ .remove = da9030_battery_remove,
+};
+
+static int da903x_battery_init(void)
+{
+ return platform_driver_register(&da903x_battery_driver);
+}
+
+static void da903x_battery_exit(void)
+{
+ platform_driver_unregister(&da903x_battery_driver);
+}
+
+module_init(da903x_battery_init);
+module_exit(da903x_battery_exit);
+
+MODULE_DESCRIPTION("DA9030 battery charger driver");
+MODULE_AUTHOR("Mike Rapoport, CompuLab");
+MODULE_LICENSE("GPL");
--
Sincerely yours,
Mike.



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