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Message-Id: <20110219150644.681D59D401D@zog.reactivated.net>
Date: Sat, 19 Feb 2011 15:06:44 +0000 (GMT)
From: Daniel Drake <dsd@...top.org>
To: dwmw2@...radead.org
Cc: dmitry.torokhov@...il.com
Subject: [PATCH] olpc_battery: bind to device tree
Move from being statically probed by platform presence to binding to
the battery node of the device tree.
This is cleaner and allows suspend/resume (wakeup) support to be added
in a later patch.
Signed-off-by: Daniel Drake <dsd@...top.org>
---
arch/x86/platform/olpc/olpc_dt.c | 13 +++++++
drivers/power/Kconfig | 2 +-
drivers/power/olpc_battery.c | 66 +++++++++++++++++++++++++------------
3 files changed, 58 insertions(+), 23 deletions(-)
Replaces patch "olpc_battery: convert to platform device"
The problem mentioned in another mail regarding devicetree binding is now
fixed via separate patches from Andres.
diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
index dab8746..97211c1 100644
--- a/arch/x86/platform/olpc/olpc_dt.c
+++ b/arch/x86/platform/olpc/olpc_dt.c
@@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <linux/bootmem.h>
#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/of_pdt.h>
#include <asm/olpc_ofw.h>
@@ -181,3 +182,15 @@ void __init olpc_dt_build_devicetree(void)
pr_info("PROM DT: Built device tree with %u bytes of memory.\n",
prom_early_allocated);
}
+
+/* A list of DT node/bus matches that we want to expose as platform devices */
+static struct of_device_id __initdata of_ids[] = {
+ { .name = "battery" },
+ {},
+};
+
+static int __init declare_of_platform_devices(void)
+{
+ return of_platform_bus_probe(NULL, of_ids, NULL);
+}
+device_initcall(declare_of_platform_devices);
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 61bf5d7..3a9151d 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -84,7 +84,7 @@ config BATTERY_PMU
config BATTERY_OLPC
tristate "One Laptop Per Child battery"
- depends on X86_32 && OLPC
+ depends on X86_32 && OLPC && OF
help
Say Y to enable support for the battery on the OLPC laptop.
diff --git a/drivers/power/olpc_battery.c b/drivers/power/olpc_battery.c
index 0b0ff3a..99fc8e0 100644
--- a/drivers/power/olpc_battery.c
+++ b/drivers/power/olpc_battery.c
@@ -17,6 +17,7 @@
#include <linux/power_supply.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
+#include <linux/of_platform.h>
#include <asm/olpc.h>
@@ -519,9 +520,8 @@ static struct device_attribute olpc_bat_error = {
* Initialisation
*********************************************************************/
-static struct platform_device *bat_pdev;
-
static struct power_supply olpc_bat = {
+ .name = "olpc-battery",
.get_property = olpc_bat_get_property,
.use_for_apm = 1,
};
@@ -534,13 +534,18 @@ void olpc_battery_trigger_uevent(unsigned long cause)
kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE);
}
-static int __init olpc_bat_init(void)
+static int __devinit olpc_battery_probe(struct platform_device *pdev,
+ const struct of_device_id *match)
{
- int ret = 0;
+ int ret;
uint8_t status;
+ struct device_node *root;
+ const char *arch;
+ int propsize;
- if (!olpc_platform_info.ecver)
- return -ENXIO;
+ /* Check that we're running on an XO laptop */
+ if (!machine_is_olpc())
+ return -ENODEV;
/*
* We've seen a number of EC protocol changes; this driver requires
@@ -552,21 +557,15 @@ static int __init olpc_bat_init(void)
return -ENXIO;
}
+ /* Ignore the status. It doesn't actually matter */
ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
if (ret)
return ret;
- /* Ignore the status. It doesn't actually matter */
-
- bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0);
- if (IS_ERR(bat_pdev))
- return PTR_ERR(bat_pdev);
-
- ret = power_supply_register(&bat_pdev->dev, &olpc_ac);
+ ret = power_supply_register(&pdev->dev, &olpc_ac);
if (ret)
- goto ac_failed;
+ return ret;
- olpc_bat.name = bat_pdev->name;
if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */
olpc_bat.properties = olpc_xo15_bat_props;
olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props);
@@ -575,7 +574,7 @@ static int __init olpc_bat_init(void)
olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props);
}
- ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
+ ret = power_supply_register(&pdev->dev, &olpc_bat);
if (ret)
goto battery_failed;
@@ -587,7 +586,7 @@ static int __init olpc_bat_init(void)
if (ret)
goto error_failed;
- goto success;
+ return 0;
error_failed:
device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
@@ -595,19 +594,42 @@ eeprom_failed:
power_supply_unregister(&olpc_bat);
battery_failed:
power_supply_unregister(&olpc_ac);
-ac_failed:
- platform_device_unregister(bat_pdev);
-success:
return ret;
}
-static void __exit olpc_bat_exit(void)
+static int __devexit olpc_battery_remove(struct platform_device *pdev)
{
device_remove_file(olpc_bat.dev, &olpc_bat_error);
device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
power_supply_unregister(&olpc_bat);
power_supply_unregister(&olpc_ac);
- platform_device_unregister(bat_pdev);
+ return 0;
+}
+
+static const struct of_device_id olpc_battery_ids[] __devinitconst = {
+ { .name = "battery" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, olpc_battery_ids);
+
+static struct of_platform_driver olpc_battery_drv = {
+ .driver = {
+ .name = "olpc-battery",
+ .owner = THIS_MODULE,
+ .of_match_table = olpc_battery_ids,
+ },
+ .probe = olpc_battery_probe,
+ .remove = __devexit_p(olpc_battery_remove),
+};
+
+static int __init olpc_bat_init(void)
+{
+ return of_register_platform_driver(&olpc_battery_drv);
+}
+
+static void __exit olpc_bat_exit(void)
+{
+ of_unregister_platform_driver(&olpc_battery_drv);
}
module_init(olpc_bat_init);
--
1.7.4
--
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