power_supply: Add Dialog DA9030 battery charger driver
Mike Rapoport [Tue, 30 Dec 2008 21:44:53 +0000 (22:44 +0100)]
Driver for battery charger integrated into Dialog Semiconductor DA9030 PMIC

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

drivers/power/Kconfig
drivers/power/Makefile
drivers/power/da9030_battery.c [new file with mode: 0644]

index 52f8676..6684724 100644 (file)
@@ -75,4 +75,11 @@ config BATTERY_BQ27x00
        help
          Say Y here to enable support for batteries with BQ27200(I2C) chip.
 
+config BATTERY_DA9030
+       tristate "DA9030 battery driver"
+       depends on PMIC_DA903X
+       help
+         Say Y here to enable support for batteries charger integrated into
+         DA9030 PMIC.
+
 endif # POWER_SUPPLY
index e6f6865..eebb155 100644 (file)
@@ -24,3 +24,4 @@ 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_DA9030)   += da9030_battery.o
diff --git a/drivers/power/da9030_battery.c b/drivers/power/da9030_battery.c
new file mode 100644 (file)
index 0000000..1662bb0
--- /dev/null
@@ -0,0 +1,600 @@
+/*
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/da903x.h>
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#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 */
+       bool chdet;
+       uint8_t fault;
+       int mA;
+       int mV;
+       bool is_on;
+
+       struct notifier_block nb;
+
+       /* platform callbacks for battery low and critical events */
+       void (*battery_low)(void);
+       void (*battery_critical)(void);
+
+       struct dentry *debug_file;
+};
+
+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;
+}
+
+#ifdef CONFIG_DEBUG_FS
+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
+static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
+{
+       return NULL;
+}
+static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger)
+{
+}
+#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;
+
+       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)
+               return;
+
+       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");