--- /dev/null
+/*
+ * Copyright (C) 2010 Motorola, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ * Based on w1_ds2784.c which is:
+ * Copyright (C) 2009 HTC Corporation
+ */
+
+#include <linux/device.h>
+#include <linux/idr.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include "../w1.h"
+#include "../w1_family.h"
+#include "../w1_int.h"
+#include "w1_ds2781.h"
+
+static int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count,
+ int io)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+ if (!dev)
+ return 0;
+
+ mutex_lock(&sl->master->mutex);
+
+ if (addr > DS2781_DATA_SIZE || addr < 0) {
+ count = 0;
+ goto out;
+ }
+ if (addr + count > DS2781_DATA_SIZE)
+ count = DS2781_DATA_SIZE - addr;
+
+ if (!w1_reset_select_slave(sl)) {
+ if (!io) {
+ w1_write_8(sl->master, W1_DS2781_READ_DATA);
+ w1_write_8(sl->master, addr);
+ count = w1_read_block(sl->master, buf, count);
+ } else {
+ w1_write_8(sl->master, W1_DS2781_WRITE_DATA);
+ w1_write_8(sl->master, addr);
+ w1_write_block(sl->master, buf, count);
+ /* XXX w1_write_block returns void, not n_written */
+ }
+ }
+
+out:
+ mutex_unlock(&sl->master->mutex);
+
+ return count;
+}
+
+int w1_ds2781_read(struct device *dev, char *buf, int addr, size_t count)
+{
+ return w1_ds2781_io(dev, buf, addr, count, 0);
+}
+EXPORT_SYMBOL(w1_ds2781_read);
+int w1_ds2781_write(struct device *dev, char *buf, int addr, size_t count)
+{
+ return w1_ds2781_io(dev, buf, addr, count, 1);
+}
+EXPORT_SYMBOL(w1_ds2781_write);
+static ssize_t w1_ds2781_read_bin(struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ return w1_ds2781_read(dev, buf, off, count);
+}
+
+static struct bin_attribute w1_ds2781_bin_attr = {
+ .attr = {
+ .name = "w1_slave",
+ .mode = S_IRUGO,
+ },
+ .size = DS2781_DATA_SIZE,
+ .read = w1_ds2781_read_bin,
+};
+
+static DEFINE_IDR(bat_idr);
+static DEFINE_MUTEX(bat_idr_lock);
+
+static int new_bat_id(void)
+{
+ int ret;
+
+ while (1) {
+ int id;
+
+ ret = idr_pre_get(&bat_idr, GFP_KERNEL);
+ if (ret == 0)
+ return -ENOMEM;
+
+ mutex_lock(&bat_idr_lock);
+ ret = idr_get_new(&bat_idr, NULL, &id);
+ mutex_unlock(&bat_idr_lock);
+
+ if (ret == 0) {
+ ret = id & MAX_ID_MASK;
+ break;
+ } else if (ret == -EAGAIN) {
+ continue;
+ } else {
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void release_bat_id(int id)
+{
+ mutex_lock(&bat_idr_lock);
+ idr_remove(&bat_idr, id);
+ mutex_unlock(&bat_idr_lock);
+}
+
+static int w1_ds2781_add_slave(struct w1_slave *sl)
+{
+ int ret;
+ int id;
+ struct platform_device *pdev;
+
+ id = new_bat_id();
+ if (id < 0) {
+ ret = id;
+ goto noid;
+ }
+
+ pdev = platform_device_alloc("ds2781-battery", id);
+ if (!pdev) {
+ ret = -ENOMEM;
+ goto pdev_alloc_failed;
+ }
+ pdev->dev.parent = &sl->dev;
+
+ ret = platform_device_add(pdev);
+ if (ret)
+ goto pdev_add_failed;
+
+ ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
+ if (ret)
+ goto bin_attr_failed;
+
+ dev_set_drvdata(&sl->dev, pdev);
+
+ return 0;
+
+bin_attr_failed:
+ platform_device_del(pdev);
+pdev_add_failed:
+ platform_device_put(pdev);
+pdev_alloc_failed:
+ release_bat_id(id);
+noid:
+ return ret;
+}
+
+static void w1_ds2781_remove_slave(struct w1_slave *sl)
+{
+ struct platform_device *pdev = dev_get_drvdata(&sl->dev);
+ int id = pdev->id;
+
+ platform_device_unregister(pdev);
+ release_bat_id(id);
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
+}
+
+static struct w1_family_ops w1_ds2781_fops = {
+ .add_slave = w1_ds2781_add_slave,
+ .remove_slave = w1_ds2781_remove_slave,
+};
+
+static struct w1_family w1_ds2781_family = {
+ .fid = W1_FAMILY_DS2781,
+ .fops = &w1_ds2781_fops,
+};
+
+static int __init w1_ds2781_init(void)
+{
+ idr_init(&bat_idr);
+ return w1_register_family(&w1_ds2781_family);
+}
+
+static void __exit w1_ds2781_exit(void)
+{
+ w1_unregister_family(&w1_ds2781_family);
+ idr_destroy(&bat_idr);
+}
+
+module_init(w1_ds2781_init);
+module_exit(w1_ds2781_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Motorola");
+MODULE_DESCRIPTION("1-wire Driver Dallas 2781 battery monitor chip");
--- /dev/null
+/*
+ * Copyright (C) 2010 Motorola, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ * Based on w1_ds2784.h which is:
+ * Copyright (C) 2009 HTC Corporation
+ */
+
+#ifndef __W1_DS2781_H__
+#define __W1_DS2781_H__
+
+#ifdef __KERNEL__
+
+/* Known commands to the DS2781 chip */
+#define W1_DS2781_READ_DATA 0x69
+#define W1_DS2781_WRITE_DATA 0x6C
+#define W1_DS2781_COPY_DATA 0x48
+#define W1_DS2781_RECALL_DATA 0xB8
+#define W1_DS2781_LOCK 0x6A
+
+/* Number of valid register addresses */
+#define DS2781_DATA_SIZE 0x80
+
+/* DS2781 1-wire slave memory map definitions */
+/* Reserved: 0x00 */
+#define DS2781_REG_STATUS 0x01
+#define DS2781_REG_RAAC_MSB 0x02
+#define DS2781_REG_RAAC_LSB 0x03
+#define DS2781_REG_RSAC_MSB 0x04
+#define DS2781_REG_RSAC_LSB 0x05
+#define DS2781_REG_RARC 0x06
+#define DS2781_REG_RSRC 0x07
+#define DS2781_REG_AVG_CURR_MSB 0x08
+#define DS2781_REG_AVG_CURR_LSB 0x09
+#define DS2781_REG_TEMP_MSB 0x0A
+#define DS2781_REG_TEMP_LSB 0x0B
+#define DS2781_REG_VOLT_MSB 0x0C
+#define DS2781_REG_VOLT_LSB 0x0D
+#define DS2781_REG_CURR_MSB 0x0E
+#define DS2781_REG_CURR_LSB 0x0F
+#define DS2781_REG_ACCUMULATE_CURR_MSB 0x10
+#define DS2781_REG_ACCUMULATE_CURR_LSB 0x11
+#define DS2781_REG_ACCUMULATE_CURR_LSB1 0x12
+#define DS2781_REG_ACCUMULATE_CURR_LSB2 0x13
+#define DS2781_REG_AGE_SCALAR 0x14
+#define DS2781_REG_SPECIAL_FEATURE 0x15
+#define DS2781_REG_FULL_MSB 0x16
+#define DS2781_REG_FULL_LSB 0x17
+#define DS2781_REG_ACTIVE_EMPTY_MSB 0x18
+#define DS2781_REG_ACTIVE_EMPTY_LSB 0x19
+#define DS2781_REG_STBY_EMPTY_MSB 0x1A
+#define DS2781_REG_STBY_EMPTY_LSB 0x1B
+/* Reserved: 0x1C - 0x1E */
+#define DS2781_REG_EEPROM 0x1F
+#define DS2781_REG_USER_EEPROM 0x20
+/* Reserved: 0x30 - 0x5F */
+#define DS2781_REG_CTRL 0x60
+#define DS2781_REG_ACCUMULATION_BIAS 0x61
+#define DS2781_REG_AGE_CAPACITY_MSB 0x62
+#define DS2781_REG_AGE_CAPACITY_LSB 0x63
+#define DS2781_REG_CHARGE_VOLT 0x64
+#define DS2781_REG_MIN_CHARGE_CURR 0x65
+#define DS2781_REG_ACTIVE_EMPTY_VOLT 0x66
+#define DS2781_REG_ACTIVE_EMPTY_CURR 0x67
+#define DS2781_REG_ACTIVE_EMPTY_40 0x68
+#define DS2781_REG_RSNSP 0x69
+#define DS2781_REG_FULL_40_MSB 0x6A
+#define DS2781_REG_FULL_40_LSB 0x6B
+#define DS2781_REG_FULL_SEG_4_SLOPE 0x6C
+#define DS2781_REG_FULL_SEG_3_SLOPE 0x6D
+#define DS2781_REG_FULL_SEG_2_SLOPE 0x6E
+#define DS2781_REG_FULL_SEG_1_SLOPE 0x6F
+#define DS2781_REG_AE_SEG_4_SLOPE 0x70
+#define DS2781_REG_AE_SEG_3_SLOPE 0x71
+#define DS2781_REG_AE_SEG_2_SLOPE 0x72
+#define DS2781_REG_AE_SEG_1_SLOPE 0x73
+#define DS2781_REG_SE_SEG_4_SLOPE 0x74
+#define DS2781_REG_SE_SEG_3_SLOPE 0x75
+#define DS2781_REG_SE_SEG_2_SLOPE 0x76
+#define DS2781_REG_SE_SEG_1_SLOPE 0x77
+#define DS2781_REG_RSGAIN_MSB 0x78
+#define DS2781_REG_RSGAIN_LSB 0x79
+#define DS2781_REG_RSTC 0x7A
+#define DS2781_REG_CURR_OFFSET_BIAS 0x7B
+#define DS2781_REG_TBP34 0x7C
+#define DS2781_REG_TBP23 0x7D
+#define DS2781_REG_TBP12 0x7E
+/* Reserved: 0x7F */
+
+extern int w1_ds2781_read(struct device *dev, char *buf, int addr,
+ size_t count);
+extern int w1_ds2781_write(struct device *dev, char *buf, int addr,
+ size_t count);
+
+#endif /* __KERNEL__ */
+
+#endif /* __W1_DS2781_H__ */
projects / firefly-linux-kernel-4.4.55.git / commitdiff