Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * 1-Wire implementation for the ds2780 chip |
| 3 | * |
| 4 | * Copyright (C) 2010 Indesign, LLC |
| 5 | * |
| 6 | * Author: Clifton Barnes <cabarnes@indesign-llc.com> |
| 7 | * |
| 8 | * Based on w1-ds2760 driver |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | #include <linux/mutex.h> |
| 22 | #include <linux/idr.h> |
| 23 | |
| 24 | #include "../w1.h" |
| 25 | #include "../w1_int.h" |
| 26 | #include "../w1_family.h" |
| 27 | #include "w1_ds2780.h" |
| 28 | |
Clifton Barnes | 9fe678f | 2011-11-02 13:39:52 -0700 | [diff] [blame] | 29 | static int w1_ds2780_do_io(struct device *dev, char *buf, int addr, |
| 30 | size_t count, int io) |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 31 | { |
| 32 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); |
| 33 | |
Clifton Barnes | 9fe678f | 2011-11-02 13:39:52 -0700 | [diff] [blame] | 34 | if (addr > DS2780_DATA_SIZE || addr < 0) |
| 35 | return 0; |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 36 | |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 37 | count = min_t(int, count, DS2780_DATA_SIZE - addr); |
| 38 | |
| 39 | if (w1_reset_select_slave(sl) == 0) { |
| 40 | if (io) { |
| 41 | w1_write_8(sl->master, W1_DS2780_WRITE_DATA); |
| 42 | w1_write_8(sl->master, addr); |
| 43 | w1_write_block(sl->master, buf, count); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 44 | } else { |
| 45 | w1_write_8(sl->master, W1_DS2780_READ_DATA); |
| 46 | w1_write_8(sl->master, addr); |
| 47 | count = w1_read_block(sl->master, buf, count); |
| 48 | } |
| 49 | } |
| 50 | |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 51 | return count; |
| 52 | } |
Clifton Barnes | 9fe678f | 2011-11-02 13:39:52 -0700 | [diff] [blame] | 53 | |
| 54 | int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, |
| 55 | int io) |
| 56 | { |
| 57 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); |
| 58 | int ret; |
| 59 | |
| 60 | if (!dev) |
| 61 | return -ENODEV; |
| 62 | |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 63 | mutex_lock(&sl->master->bus_mutex); |
Clifton Barnes | 9fe678f | 2011-11-02 13:39:52 -0700 | [diff] [blame] | 64 | |
| 65 | ret = w1_ds2780_do_io(dev, buf, addr, count, io); |
| 66 | |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 67 | mutex_unlock(&sl->master->bus_mutex); |
Clifton Barnes | 9fe678f | 2011-11-02 13:39:52 -0700 | [diff] [blame] | 68 | |
| 69 | return ret; |
| 70 | } |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 71 | EXPORT_SYMBOL(w1_ds2780_io); |
| 72 | |
| 73 | int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd) |
| 74 | { |
| 75 | struct w1_slave *sl = container_of(dev, struct w1_slave, dev); |
| 76 | |
| 77 | if (!dev) |
| 78 | return -EINVAL; |
| 79 | |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 80 | mutex_lock(&sl->master->bus_mutex); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 81 | |
| 82 | if (w1_reset_select_slave(sl) == 0) { |
| 83 | w1_write_8(sl->master, cmd); |
| 84 | w1_write_8(sl->master, addr); |
| 85 | } |
| 86 | |
NeilBrown | b02f8be | 2012-05-18 15:59:52 +1000 | [diff] [blame] | 87 | mutex_unlock(&sl->master->bus_mutex); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 88 | return 0; |
| 89 | } |
| 90 | EXPORT_SYMBOL(w1_ds2780_eeprom_cmd); |
| 91 | |
| 92 | static ssize_t w1_ds2780_read_bin(struct file *filp, |
| 93 | struct kobject *kobj, |
| 94 | struct bin_attribute *bin_attr, |
| 95 | char *buf, loff_t off, size_t count) |
| 96 | { |
| 97 | struct device *dev = container_of(kobj, struct device, kobj); |
| 98 | return w1_ds2780_io(dev, buf, off, count, 0); |
| 99 | } |
| 100 | |
| 101 | static struct bin_attribute w1_ds2780_bin_attr = { |
| 102 | .attr = { |
| 103 | .name = "w1_slave", |
| 104 | .mode = S_IRUGO, |
| 105 | }, |
| 106 | .size = DS2780_DATA_SIZE, |
| 107 | .read = w1_ds2780_read_bin, |
| 108 | }; |
| 109 | |
Jonathan Cameron | 3e54281 | 2011-11-02 13:39:43 -0700 | [diff] [blame] | 110 | static DEFINE_IDA(bat_ida); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 111 | |
| 112 | static int w1_ds2780_add_slave(struct w1_slave *sl) |
| 113 | { |
| 114 | int ret; |
| 115 | int id; |
| 116 | struct platform_device *pdev; |
| 117 | |
Jonathan Cameron | 3e54281 | 2011-11-02 13:39:43 -0700 | [diff] [blame] | 118 | id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 119 | if (id < 0) { |
| 120 | ret = id; |
| 121 | goto noid; |
| 122 | } |
| 123 | |
| 124 | pdev = platform_device_alloc("ds2780-battery", id); |
| 125 | if (!pdev) { |
| 126 | ret = -ENOMEM; |
| 127 | goto pdev_alloc_failed; |
| 128 | } |
| 129 | pdev->dev.parent = &sl->dev; |
| 130 | |
| 131 | ret = platform_device_add(pdev); |
| 132 | if (ret) |
| 133 | goto pdev_add_failed; |
| 134 | |
| 135 | ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2780_bin_attr); |
| 136 | if (ret) |
| 137 | goto bin_attr_failed; |
| 138 | |
| 139 | dev_set_drvdata(&sl->dev, pdev); |
| 140 | |
| 141 | return 0; |
| 142 | |
| 143 | bin_attr_failed: |
Wei Yongjun | c5cfedf | 2013-04-30 15:28:36 -0700 | [diff] [blame] | 144 | platform_device_del(pdev); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 145 | pdev_add_failed: |
Wei Yongjun | c5cfedf | 2013-04-30 15:28:36 -0700 | [diff] [blame] | 146 | platform_device_put(pdev); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 147 | pdev_alloc_failed: |
Jonathan Cameron | 3e54281 | 2011-11-02 13:39:43 -0700 | [diff] [blame] | 148 | ida_simple_remove(&bat_ida, id); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 149 | noid: |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | static void w1_ds2780_remove_slave(struct w1_slave *sl) |
| 154 | { |
| 155 | struct platform_device *pdev = dev_get_drvdata(&sl->dev); |
| 156 | int id = pdev->id; |
| 157 | |
| 158 | platform_device_unregister(pdev); |
Jonathan Cameron | 3e54281 | 2011-11-02 13:39:43 -0700 | [diff] [blame] | 159 | ida_simple_remove(&bat_ida, id); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 160 | sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2780_bin_attr); |
| 161 | } |
| 162 | |
| 163 | static struct w1_family_ops w1_ds2780_fops = { |
| 164 | .add_slave = w1_ds2780_add_slave, |
| 165 | .remove_slave = w1_ds2780_remove_slave, |
| 166 | }; |
| 167 | |
| 168 | static struct w1_family w1_ds2780_family = { |
| 169 | .fid = W1_FAMILY_DS2780, |
| 170 | .fops = &w1_ds2780_fops, |
| 171 | }; |
| 172 | |
| 173 | static int __init w1_ds2780_init(void) |
| 174 | { |
Jonathan Cameron | 3e54281 | 2011-11-02 13:39:43 -0700 | [diff] [blame] | 175 | ida_init(&bat_ida); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 176 | return w1_register_family(&w1_ds2780_family); |
| 177 | } |
| 178 | |
| 179 | static void __exit w1_ds2780_exit(void) |
| 180 | { |
| 181 | w1_unregister_family(&w1_ds2780_family); |
Jonathan Cameron | 3e54281 | 2011-11-02 13:39:43 -0700 | [diff] [blame] | 182 | ida_destroy(&bat_ida); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | module_init(w1_ds2780_init); |
| 186 | module_exit(w1_ds2780_exit); |
| 187 | |
| 188 | MODULE_LICENSE("GPL"); |
| 189 | MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); |
| 190 | MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC"); |
Alexander Stein | 8d7bda5 | 2013-05-26 20:06:50 +0200 | [diff] [blame] | 191 | MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780)); |