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authorAnton Vorontsov <cbou@mail.ru>2007-05-04 00:32:17 +0400
committerDavid Woodhouse <dwmw2@infradead.org>2007-07-10 11:25:59 +0100
commitb2998049cfae4f4a81c4bb048814d34912017bb9 (patch)
treece56af8b6600a31bd78de03787848e1cecc044c8 /drivers
parent4a11b59d8283662193a9c6a9c14c58d1b9bf0617 (diff)
[BATTERY] pda_power platform driver
Common power driver for PDAs and phones with one or two external power supplies (AC/USB) connected to main and backup batteries, and optional builtin charger. It's used to stop logic duplication through different embedded devices. So, power supply *logic* is here. pda_power register power supplies, and will take care about notifying batteries about power changes through external power interface. Currently, power consumption legal limits (including USB power consumption) should be handled by platform code, inside set_charge function. Signed-off-by: Anton Vorontsov <cbou@mail.ru> Signed-off-by: Roman Moravcik <roman.moravcik@gmail.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/power/Kconfig7
-rw-r--r--drivers/power/Makefile2
-rw-r--r--drivers/power/pda_power.c261
3 files changed, 270 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 7811fa62741..cc70644db94 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -14,4 +14,11 @@ config POWER_SUPPLY_DEBUG
Say Y here to enable debugging messages for power supply class
and drivers.
+config PDA_POWER
+ tristate "Generic PDA/phone power driver"
+ help
+ Say Y here to enable generic power driver for PDAs and phones with
+ one or two external power supplies (AC/USB) connected to main and
+ backup batteries, and optional builtin charger.
+
endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 3c88148983a..1ff4b680638 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -13,3 +13,5 @@ EXTRA_CFLAGS += -DDEBUG
endif
obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
+
+obj-$(CONFIG_PDA_POWER) += pda_power.o
diff --git a/drivers/power/pda_power.c b/drivers/power/pda_power.c
new file mode 100644
index 00000000000..4e1eb040e14
--- /dev/null
+++ b/drivers/power/pda_power.c
@@ -0,0 +1,261 @@
+/*
+ * Common power driver for PDAs and phones with one or two external
+ * power supplies (AC/USB) connected to main and backup batteries,
+ * and optional builtin charger.
+ *
+ * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
+ *
+ * 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/interrupt.h>
+#include <linux/power_supply.h>
+#include <linux/pda_power.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+
+static inline unsigned int get_irq_flags(struct resource *res)
+{
+ unsigned int flags = IRQF_DISABLED | IRQF_SHARED;
+
+ flags |= res->flags & IRQF_TRIGGER_MASK;
+
+ return flags;
+}
+
+static struct device *dev;
+static struct pda_power_pdata *pdata;
+static struct resource *ac_irq, *usb_irq;
+static struct timer_list charger_timer;
+static struct timer_list supply_timer;
+
+static int pda_power_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ if (psy->type == POWER_SUPPLY_TYPE_MAINS)
+ val->intval = pdata->is_ac_online ?
+ pdata->is_ac_online() : 0;
+ else
+ val->intval = pdata->is_usb_online ?
+ pdata->is_usb_online() : 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static enum power_supply_property pda_power_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static char *pda_power_supplied_to[] = {
+ "main-battery",
+ "backup-battery",
+};
+
+static struct power_supply pda_power_supplies[] = {
+ {
+ .name = "ac",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .supplied_to = pda_power_supplied_to,
+ .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
+ .properties = pda_power_props,
+ .num_properties = ARRAY_SIZE(pda_power_props),
+ .get_property = pda_power_get_property,
+ },
+ {
+ .name = "usb",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .supplied_to = pda_power_supplied_to,
+ .num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
+ .properties = pda_power_props,
+ .num_properties = ARRAY_SIZE(pda_power_props),
+ .get_property = pda_power_get_property,
+ },
+};
+
+static void update_charger(void)
+{
+ if (!pdata->set_charge)
+ return;
+
+ if (pdata->is_ac_online && pdata->is_ac_online()) {
+ dev_dbg(dev, "charger on (AC)\n");
+ pdata->set_charge(PDA_POWER_CHARGE_AC);
+ } else if (pdata->is_usb_online && pdata->is_usb_online()) {
+ dev_dbg(dev, "charger on (USB)\n");
+ pdata->set_charge(PDA_POWER_CHARGE_USB);
+ } else {
+ dev_dbg(dev, "charger off\n");
+ pdata->set_charge(0);
+ }
+
+ return;
+}
+
+static void supply_timer_func(unsigned long irq)
+{
+ if (ac_irq && irq == ac_irq->start)
+ power_supply_changed(&pda_power_supplies[0]);
+ else if (usb_irq && irq == usb_irq->start)
+ power_supply_changed(&pda_power_supplies[1]);
+ return;
+}
+
+static void charger_timer_func(unsigned long irq)
+{
+ update_charger();
+
+ /* Okay, charger set. Now wait a bit before notifying supplicants,
+ * charge power should stabilize. */
+ supply_timer.data = irq;
+ mod_timer(&supply_timer,
+ jiffies + msecs_to_jiffies(pdata->wait_for_charger));
+ return;
+}
+
+static irqreturn_t power_changed_isr(int irq, void *unused)
+{
+ /* Wait a bit before reading ac/usb line status and setting charger,
+ * because ac/usb status readings may lag from irq. */
+ charger_timer.data = irq;
+ mod_timer(&charger_timer,
+ jiffies + msecs_to_jiffies(pdata->wait_for_status));
+ return IRQ_HANDLED;
+}
+
+static int pda_power_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+
+ dev = &pdev->dev;
+
+ if (pdev->id != -1) {
+ dev_err(dev, "it's meaningless to register several "
+ "pda_powers; use id = -1\n");
+ ret = -EINVAL;
+ goto wrongid;
+ }
+
+ pdata = pdev->dev.platform_data;
+
+ update_charger();
+
+ if (!pdata->wait_for_status)
+ pdata->wait_for_status = 500;
+
+ if (!pdata->wait_for_charger)
+ pdata->wait_for_charger = 500;
+
+ setup_timer(&charger_timer, charger_timer_func, 0);
+ setup_timer(&supply_timer, supply_timer_func, 0);
+
+ ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
+ usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
+ if (!ac_irq && !usb_irq) {
+ dev_err(dev, "no ac/usb irq specified\n");
+ ret = -ENODEV;
+ goto noirqs;
+ }
+
+ if (pdata->supplied_to) {
+ pda_power_supplies[0].supplied_to = pdata->supplied_to;
+ pda_power_supplies[1].supplied_to = pdata->supplied_to;
+ pda_power_supplies[0].num_supplicants = pdata->num_supplicants;
+ pda_power_supplies[1].num_supplicants = pdata->num_supplicants;
+ }
+
+ ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]);
+ if (ret) {
+ dev_err(dev, "failed to register %s power supply\n",
+ pda_power_supplies[0].name);
+ goto supply0_failed;
+ }
+
+ ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]);
+ if (ret) {
+ dev_err(dev, "failed to register %s power supply\n",
+ pda_power_supplies[1].name);
+ goto supply1_failed;
+ }
+
+ if (ac_irq) {
+ ret = request_irq(ac_irq->start, power_changed_isr,
+ get_irq_flags(ac_irq), ac_irq->name,
+ &pda_power_supplies[0]);
+ if (ret) {
+ dev_err(dev, "request ac irq failed\n");
+ goto ac_irq_failed;
+ }
+ }
+
+ if (usb_irq) {
+ ret = request_irq(usb_irq->start, power_changed_isr,
+ get_irq_flags(usb_irq), usb_irq->name,
+ &pda_power_supplies[1]);
+ if (ret) {
+ dev_err(dev, "request usb irq failed\n");
+ goto usb_irq_failed;
+ }
+ }
+
+ goto success;
+
+usb_irq_failed:
+ if (ac_irq)
+ free_irq(ac_irq->start, &pda_power_supplies[0]);
+ac_irq_failed:
+ power_supply_unregister(&pda_power_supplies[1]);
+supply1_failed:
+ power_supply_unregister(&pda_power_supplies[0]);
+supply0_failed:
+noirqs:
+wrongid:
+success:
+ return ret;
+}
+
+static int pda_power_remove(struct platform_device *pdev)
+{
+ if (usb_irq)
+ free_irq(usb_irq->start, &pda_power_supplies[1]);
+ if (ac_irq)
+ free_irq(ac_irq->start, &pda_power_supplies[0]);
+ del_timer_sync(&charger_timer);
+ del_timer_sync(&supply_timer);
+ power_supply_unregister(&pda_power_supplies[1]);
+ power_supply_unregister(&pda_power_supplies[0]);
+ return 0;
+}
+
+static struct platform_driver pda_power_pdrv = {
+ .driver = {
+ .name = "pda-power",
+ },
+ .probe = pda_power_probe,
+ .remove = pda_power_remove,
+};
+
+static int __init pda_power_init(void)
+{
+ return platform_driver_register(&pda_power_pdrv);
+}
+
+static void __exit pda_power_exit(void)
+{
+ platform_driver_unregister(&pda_power_pdrv);
+ return;
+}
+
+module_init(pda_power_init);
+module_exit(pda_power_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");