power: supply: act8945a_charger: Add status change update support
authorWenyou Yang <wenyou.yang@atmel.com>
Thu, 25 Aug 2016 07:19:53 +0000 (15:19 +0800)
committerSebastian Reichel <sre@kernel.org>
Wed, 31 Aug 2016 14:46:57 +0000 (16:46 +0200)
Add the charger status change interrupt support, it will report
the power supply changed event.

This interrupt is generated by one of the conditions as below:
 - the state machine jumps out of or into the EOC state
 - the CHGIN input voltage goes out of or into the valid range.
 - the battery temperature goes out of or into the valid range.
 - the PRECHARGE time-out occurs.
 - the total charge time-out occurs.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
drivers/power/supply/act8945a_charger.c

index a6bbaff5483ed891e2e1c6da465b87bb243fa6e5..e129255c1e0d283e636c15157f740e1dd4e84662 100644 (file)
  * published by the Free Software Foundation.
  *
  */
+#include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
+#include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/power_supply.h>
 #include <linux/regmap.h>
@@ -75,7 +77,11 @@ static const char *act8945a_charger_manufacturer = "Active-semi";
 #define APCH_STATE_CSTATE_PRE          0x03
 
 struct act8945a_charger {
+       struct power_supply *psy;
        struct regmap *regmap;
+       struct work_struct work;
+
+       bool init_done;
 };
 
 static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@@ -252,6 +258,47 @@ static const struct power_supply_desc act8945a_charger_desc = {
        .num_properties = ARRAY_SIZE(act8945a_charger_props),
 };
 
+static int act8945a_enable_interrupt(struct act8945a_charger *charger)
+{
+       struct regmap *regmap = charger->regmap;
+       unsigned char ctrl;
+       int ret;
+
+       ctrl = APCH_CTRL_CHGEOCOUT | APCH_CTRL_CHGEOCIN |
+              APCH_CTRL_INDIS | APCH_CTRL_INCON |
+              APCH_CTRL_TEMPOUT | APCH_CTRL_TEMPIN |
+              APCH_CTRL_TIMRPRE | APCH_CTRL_TIMRTOT;
+       ret = regmap_write(regmap, ACT8945A_APCH_CTRL, ctrl);
+       if (ret)
+               return ret;
+
+       ctrl = APCH_STATUS_CHGSTAT | APCH_STATUS_INSTAT |
+              APCH_STATUS_TEMPSTAT | APCH_STATUS_TIMRSTAT;
+       ret = regmap_write(regmap, ACT8945A_APCH_STATUS, ctrl);
+       if (ret)
+               return ret;
+
+       return 0;
+}
+
+static void act8945a_work(struct work_struct *work)
+{
+       struct act8945a_charger *charger =
+                       container_of(work, struct act8945a_charger, work);
+
+       power_supply_changed(charger->psy);
+}
+
+static irqreturn_t act8945a_status_changed(int irq, void *dev_id)
+{
+       struct act8945a_charger *charger = dev_id;
+
+       if (charger->init_done)
+               schedule_work(&charger->work);
+
+       return IRQ_HANDLED;
+}
+
 #define DEFAULT_TOTAL_TIME_OUT         3
 #define DEFAULT_PRE_TIME_OUT           40
 #define DEFAULT_INPUT_OVP_THRESHOLD    6600
@@ -362,9 +409,8 @@ static int act8945a_charger_config(struct device *dev,
 static int act8945a_charger_probe(struct platform_device *pdev)
 {
        struct act8945a_charger *charger;
-       struct power_supply *psy;
        struct power_supply_config psy_cfg = {};
-       int ret;
+       int irq, ret;
 
        charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
        if (!charger)
@@ -380,17 +426,51 @@ static int act8945a_charger_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
+       irq = of_irq_get(pdev->dev.of_node, 0);
+       if (irq == -EPROBE_DEFER) {
+               dev_err(&pdev->dev, "failed to find IRQ number\n");
+               return -EPROBE_DEFER;
+       }
+
+       ret = devm_request_irq(&pdev->dev, irq, act8945a_status_changed,
+                              IRQF_TRIGGER_FALLING, "act8945a_interrupt",
+                              charger);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to request nIRQ pin IRQ\n");
+               return ret;
+       }
+
        psy_cfg.of_node = pdev->dev.of_node;
        psy_cfg.drv_data = charger;
 
-       psy = devm_power_supply_register(&pdev->dev,
-                                        &act8945a_charger_desc,
-                                        &psy_cfg);
-       if (IS_ERR(psy)) {
+       charger->psy = devm_power_supply_register(&pdev->dev,
+                                                 &act8945a_charger_desc,
+                                                 &psy_cfg);
+       if (IS_ERR(charger->psy)) {
                dev_err(&pdev->dev, "failed to register power supply\n");
-               return PTR_ERR(psy);
+               return PTR_ERR(charger->psy);
        }
 
+       platform_set_drvdata(pdev, charger);
+
+       INIT_WORK(&charger->work, act8945a_work);
+
+       ret = act8945a_enable_interrupt(charger);
+       if (ret)
+               return -EIO;
+
+       charger->init_done = true;
+
+       return 0;
+}
+
+static int act8945a_charger_remove(struct platform_device *pdev)
+{
+       struct act8945a_charger *charger = platform_get_drvdata(pdev);
+
+       charger->init_done = false;
+       cancel_work_sync(&charger->work);
+
        return 0;
 }
 
@@ -399,6 +479,7 @@ static struct platform_driver act8945a_charger_driver = {
                .name = "act8945a-charger",
        },
        .probe  = act8945a_charger_probe,
+       .remove = act8945a_charger_remove,
 };
 module_platform_driver(act8945a_charger_driver);