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A battery controller i2c driver for the n30.
I don't use this driver any more, it was much nicer to use the ARM APM
emulation to expose this data.
Index: linux-2.6.14/drivers/hwmon/Kconfig
===================================================================
--- linux-2.6.14.orig/drivers/hwmon/Kconfig
+++ linux-2.6.14/drivers/hwmon/Kconfig
@@ -290,6 +290,16 @@
This driver can also be built as a module. If so, the module
will be called max1619.
+config SENSORS_N30_BATT
+ tristate "Acer N30 Battery Controller"
+ depends on HWMON && I2C && MACH_N30
+ help
+ If you say yes here you get support for the battery controller
+ found inside the Acer N30 PDA.
+
+ This driver can also be built as a module. If so, the module
+ will be called n30_batt.
+
config SENSORS_PC87360
tristate "National Semiconductor PC87360 family"
depends on HWMON && I2C && EXPERIMENTAL
Index: linux-2.6.14/drivers/hwmon/Makefile
===================================================================
--- linux-2.6.14.orig/drivers/hwmon/Makefile
+++ linux-2.6.14/drivers/hwmon/Makefile
@@ -35,6 +35,7 @@
obj-$(CONFIG_SENSORS_LM90) += lm90.o
obj-$(CONFIG_SENSORS_LM92) += lm92.o
obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
+obj-$(CONFIG_SENSORS_N30_BATT) += n30_batt.o
obj-$(CONFIG_SENSORS_PC87360) += pc87360.o
obj-$(CONFIG_SENSORS_SIS5595) += sis5595.o
obj-$(CONFIG_SENSORS_SMSC47B397)+= smsc47b397.o
Index: linux-2.6.14/drivers/hwmon/n30_batt.c
===================================================================
--- linux-2.6.14.orig/drivers/hwmon/n30_batt.c
+++ linux-2.6.14/drivers/hwmon/n30_batt.c
@@ -0,0 +1,199 @@
+/*
+ * n30_batt.c - Support for the Acer N30 Battery Controller
+ * Copyright (c) 2005 Christer Weinigel <christer@weinigel.se>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <asm/mach-types.h>
+#include <asm/apm.h>
+
+static unsigned short normal_i2c[] = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short probe[] = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short ignore[] = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short force[] = { -1, 0x0b, I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short *forces[] = { force, NULL };
+
+static struct i2c_client_address_data addr_data = {
+ .normal_i2c = normal_i2c,
+ .probe = probe,
+ .ignore = ignore,
+ .forces = forces,
+};
+
+struct n30_batt_data {
+ struct i2c_client client;
+ struct semaphore update_lock;
+ unsigned long last_updated; /* last update in jiffies */
+ u8 charge;
+};
+
+static struct n30_batt_data *n30_batt_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct n30_batt_data *data = i2c_get_clientdata(client);
+
+ down(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + 3 * HZ)) {
+ int value;
+
+ value = i2c_smbus_read_byte(client);
+
+ if (value == -1)
+ printk(KERN_WARNING "n30-batt: unable to read charge\n");
+ else
+ data->charge = value;
+ data->last_updated = jiffies;
+ }
+
+ up(&data->update_lock);
+
+ return data;
+}
+
+static ssize_t show_charge(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct n30_batt_data *data = n30_batt_update_device(dev);
+ return sprintf(buf, "%d\n", data->charge);
+}
+
+static DEVICE_ATTR(charge, S_IRUGO, show_charge, NULL);
+
+static struct i2c_driver n30_batt_driver;
+
+static struct device *n30_batt_dev;
+
+static int n30_batt_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+ struct i2c_client *new_client;
+ struct n30_batt_data *data;
+ int err = 0;
+ int value;
+
+ printk(KERN_INFO "detect n30 Battery controller\n");
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ goto exit;
+
+ printk(KERN_INFO "kmalloc n30 Battery controller\n");
+
+ if (!(data = kmalloc(sizeof(struct n30_batt_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit;
+ }
+ memset(data, 0, sizeof(struct n30_batt_data));
+
+ new_client = &data->client;
+ i2c_set_clientdata(new_client, data);
+ new_client->addr = address;
+ new_client->adapter = adapter;
+ new_client->driver = &n30_batt_driver;
+ new_client->flags = 0;
+ strlcpy(new_client->name, "n30_batt", I2C_NAME_SIZE);
+
+ if ((value = i2c_smbus_read_byte(new_client)) == -1) {
+ printk(KERN_ERR "n30_batt: unable to read charge value\n");
+ err = -ENXIO;
+ goto exit_free;
+ }
+
+ init_MUTEX(&data->update_lock);
+ data->charge = value;
+ data->last_updated = jiffies;
+
+ printk(KERN_DEBUG "n30_batt: battery charge is %d%%\n", data->charge);
+
+ if ((err = i2c_attach_client(new_client)))
+ goto exit_free;
+
+ device_create_file(&new_client->dev, &dev_attr_charge);
+
+ n30_batt_dev = &new_client->dev;
+
+ return 0;
+
+exit_free:
+ kfree(data);
+exit:
+ return err;
+}
+
+static int n30_batt_attach_adapter(struct i2c_adapter *adapter)
+{
+ printk(KERN_INFO "attaching n30 Battery controller\n");
+ return i2c_probe(adapter, &addr_data, n30_batt_detect);
+}
+
+static int n30_batt_detach_client(struct i2c_client *client)
+{
+ n30_batt_dev = NULL;
+ i2c_detach_client(client);
+ kfree(i2c_get_clientdata(client));
+ return 0;
+}
+
+static struct i2c_driver n30_batt_driver = {
+ .owner = THIS_MODULE,
+ .name = "n30_batt",
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = n30_batt_attach_adapter,
+ .detach_client = n30_batt_detach_client,
+};
+
+static void n30_get_power_status(struct apm_power_info *info)
+{
+ if (n30_batt_dev) {
+ struct n30_batt_data *data = n30_batt_update_device(n30_batt_dev);
+
+ info->ac_line_status = 0xff;
+ info->battery_status = 0xff;
+ info->battery_flag = 0xff;
+ info->battery_life = data->charge;
+ info->time = -1;
+ info->units = -1;
+ }
+}
+
+static int __init sensors_n30_batt_init(void)
+{
+ printk(KERN_INFO "n30 Battery controller\n");
+
+ if (!machine_is_n30())
+ return -ENODEV;
+ printk(KERN_INFO "adding n30 Battery controller\n");
+
+ apm_get_power_status = n30_get_power_status;
+
+ return i2c_add_driver(&n30_batt_driver);
+}
+
+static void __exit sensors_n30_batt_exit(void)
+{
+ i2c_del_driver(&n30_batt_driver);
+}
+
+MODULE_AUTHOR("Christer Weinigel <christer@weinigel.se>");
+MODULE_DESCRIPTION("Acer n30 Battery Controller");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_n30_batt_init);
+module_exit(sensors_n30_batt_exit);
|
