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| 1 | /* |
| 2 | * max17040_battery.c |
| 3 | * fuel-gauge systems for lithium-ion (Li+) batteries |
| 4 | * |
| 5 | * Copyright (C) 2009 Samsung Electronics |
| 6 | * Minkyu Kang <mk7.kang@samsung.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/mutex.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/i2c.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/power_supply.h> |
| 21 | #include <linux/max17040_battery.h> |
| 22 | #include <linux/slab.h> |
| 23 | |
| 24 | #define MAX17040_VCELL_MSB 0x02 |
| 25 | #define MAX17040_VCELL_LSB 0x03 |
| 26 | #define MAX17040_SOC_MSB 0x04 |
| 27 | #define MAX17040_SOC_LSB 0x05 |
| 28 | #define MAX17040_MODE_MSB 0x06 |
| 29 | #define MAX17040_MODE_LSB 0x07 |
| 30 | #define MAX17040_VER_MSB 0x08 |
| 31 | #define MAX17040_VER_LSB 0x09 |
| 32 | #define MAX17040_RCOMP_MSB 0x0C |
| 33 | #define MAX17040_RCOMP_LSB 0x0D |
| 34 | #define MAX17040_CMD_MSB 0xFE |
| 35 | #define MAX17040_CMD_LSB 0xFF |
| 36 | |
| 37 | #define MAX17040_DELAY 1000 |
| 38 | #define MAX17040_BATTERY_FULL 95 |
| 39 | |
| 40 | struct max17040_chip { |
| 41 | struct i2c_client *client; |
| 42 | struct delayed_work work; |
| 43 | struct power_supply battery; |
| 44 | struct max17040_platform_data *pdata; |
| 45 | |
| 46 | /* State Of Connect */ |
| 47 | int online; |
| 48 | /* battery voltage */ |
| 49 | int vcell; |
| 50 | /* battery capacity */ |
| 51 | int soc; |
| 52 | /* State Of Charge */ |
| 53 | int status; |
| 54 | }; |
| 55 | |
| 56 | static int max17040_get_property(struct power_supply *psy, |
| 57 | enum power_supply_property psp, |
| 58 | union power_supply_propval *val) |
| 59 | { |
| 60 | struct max17040_chip *chip = container_of(psy, |
| 61 | struct max17040_chip, battery); |
| 62 | |
| 63 | switch (psp) { |
| 64 | case POWER_SUPPLY_PROP_STATUS: |
| 65 | val->intval = chip->status; |
| 66 | break; |
| 67 | case POWER_SUPPLY_PROP_ONLINE: |
| 68 | val->intval = chip->online; |
| 69 | break; |
| 70 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| 71 | val->intval = chip->vcell; |
| 72 | break; |
| 73 | case POWER_SUPPLY_PROP_CAPACITY: |
| 74 | val->intval = chip->soc; |
| 75 | break; |
| 76 | default: |
| 77 | return -EINVAL; |
| 78 | } |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | static int max17040_write_reg(struct i2c_client *client, int reg, u8 value) |
| 83 | { |
| 84 | int ret; |
| 85 | |
| 86 | ret = i2c_smbus_write_byte_data(client, reg, value); |
| 87 | |
| 88 | if (ret < 0) |
| 89 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| 90 | |
| 91 | return ret; |
| 92 | } |
| 93 | |
| 94 | static int max17040_read_reg(struct i2c_client *client, int reg) |
| 95 | { |
| 96 | int ret; |
| 97 | |
| 98 | ret = i2c_smbus_read_byte_data(client, reg); |
| 99 | |
| 100 | if (ret < 0) |
| 101 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| 102 | |
| 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | static void max17040_reset(struct i2c_client *client) |
| 107 | { |
| 108 | max17040_write_reg(client, MAX17040_CMD_MSB, 0x54); |
| 109 | max17040_write_reg(client, MAX17040_CMD_LSB, 0x00); |
| 110 | } |
| 111 | |
| 112 | static void max17040_get_vcell(struct i2c_client *client) |
| 113 | { |
| 114 | struct max17040_chip *chip = i2c_get_clientdata(client); |
| 115 | u8 msb; |
| 116 | u8 lsb; |
| 117 | |
| 118 | msb = max17040_read_reg(client, MAX17040_VCELL_MSB); |
| 119 | lsb = max17040_read_reg(client, MAX17040_VCELL_LSB); |
| 120 | |
| 121 | chip->vcell = (msb << 4) + (lsb >> 4); |
| 122 | } |
| 123 | |
| 124 | static void max17040_get_soc(struct i2c_client *client) |
| 125 | { |
| 126 | struct max17040_chip *chip = i2c_get_clientdata(client); |
| 127 | u8 msb; |
| 128 | u8 lsb; |
| 129 | |
| 130 | msb = max17040_read_reg(client, MAX17040_SOC_MSB); |
| 131 | lsb = max17040_read_reg(client, MAX17040_SOC_LSB); |
| 132 | |
| 133 | chip->soc = msb; |
| 134 | } |
| 135 | |
| 136 | static void max17040_get_version(struct i2c_client *client) |
| 137 | { |
| 138 | u8 msb; |
| 139 | u8 lsb; |
| 140 | |
| 141 | msb = max17040_read_reg(client, MAX17040_VER_MSB); |
| 142 | lsb = max17040_read_reg(client, MAX17040_VER_LSB); |
| 143 | |
| 144 | dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver %d%d\n", msb, lsb); |
| 145 | } |
| 146 | |
| 147 | static void max17040_get_online(struct i2c_client *client) |
| 148 | { |
| 149 | struct max17040_chip *chip = i2c_get_clientdata(client); |
| 150 | |
| 151 | if (chip->pdata->battery_online) |
| 152 | chip->online = chip->pdata->battery_online(); |
| 153 | else |
| 154 | chip->online = 1; |
| 155 | } |
| 156 | |
| 157 | static void max17040_get_status(struct i2c_client *client) |
| 158 | { |
| 159 | struct max17040_chip *chip = i2c_get_clientdata(client); |
| 160 | |
| 161 | if (!chip->pdata->charger_online || !chip->pdata->charger_enable) { |
| 162 | chip->status = POWER_SUPPLY_STATUS_UNKNOWN; |
| 163 | return; |
| 164 | } |
| 165 | |
| 166 | if (chip->pdata->charger_online()) { |
| 167 | if (chip->pdata->charger_enable()) |
| 168 | chip->status = POWER_SUPPLY_STATUS_CHARGING; |
| 169 | else |
| 170 | chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 171 | } else { |
| 172 | chip->status = POWER_SUPPLY_STATUS_DISCHARGING; |
| 173 | } |
| 174 | |
| 175 | if (chip->soc > MAX17040_BATTERY_FULL) |
| 176 | chip->status = POWER_SUPPLY_STATUS_FULL; |
| 177 | } |
| 178 | |
| 179 | static void max17040_work(struct work_struct *work) |
| 180 | { |
| 181 | struct max17040_chip *chip; |
| 182 | |
| 183 | chip = container_of(work, struct max17040_chip, work.work); |
| 184 | |
| 185 | max17040_get_vcell(chip->client); |
| 186 | max17040_get_soc(chip->client); |
| 187 | max17040_get_online(chip->client); |
| 188 | max17040_get_status(chip->client); |
| 189 | |
| 190 | schedule_delayed_work(&chip->work, MAX17040_DELAY); |
| 191 | } |
| 192 | |
| 193 | static enum power_supply_property max17040_battery_props[] = { |
| 194 | POWER_SUPPLY_PROP_STATUS, |
| 195 | POWER_SUPPLY_PROP_ONLINE, |
| 196 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 197 | POWER_SUPPLY_PROP_CAPACITY, |
| 198 | }; |
| 199 | |
| 200 | static int __devinit max17040_probe(struct i2c_client *client, |
| 201 | const struct i2c_device_id *id) |
| 202 | { |
| 203 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
| 204 | struct max17040_chip *chip; |
| 205 | int ret; |
| 206 | |
| 207 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) |
| 208 | return -EIO; |
| 209 | |
| 210 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 211 | if (!chip) |
| 212 | return -ENOMEM; |
| 213 | |
| 214 | chip->client = client; |
| 215 | chip->pdata = client->dev.platform_data; |
| 216 | |
| 217 | i2c_set_clientdata(client, chip); |
| 218 | |
| 219 | chip->battery.name = "battery"; |
| 220 | chip->battery.type = POWER_SUPPLY_TYPE_BATTERY; |
| 221 | chip->battery.get_property = max17040_get_property; |
| 222 | chip->battery.properties = max17040_battery_props; |
| 223 | chip->battery.num_properties = ARRAY_SIZE(max17040_battery_props); |
| 224 | |
| 225 | ret = power_supply_register(&client->dev, &chip->battery); |
| 226 | if (ret) { |
| 227 | dev_err(&client->dev, "failed: power supply register\n"); |
| 228 | kfree(chip); |
| 229 | return ret; |
| 230 | } |
| 231 | |
| 232 | max17040_reset(client); |
| 233 | max17040_get_version(client); |
| 234 | |
| 235 | INIT_DELAYED_WORK_DEFERRABLE(&chip->work, max17040_work); |
| 236 | schedule_delayed_work(&chip->work, MAX17040_DELAY); |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | static int __devexit max17040_remove(struct i2c_client *client) |
| 242 | { |
| 243 | struct max17040_chip *chip = i2c_get_clientdata(client); |
| 244 | |
| 245 | power_supply_unregister(&chip->battery); |
| 246 | cancel_delayed_work(&chip->work); |
| 247 | kfree(chip); |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | #ifdef CONFIG_PM |
| 252 | |
| 253 | static int max17040_suspend(struct i2c_client *client, |
| 254 | pm_message_t state) |
| 255 | { |
| 256 | struct max17040_chip *chip = i2c_get_clientdata(client); |
| 257 | |
| 258 | cancel_delayed_work(&chip->work); |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | static int max17040_resume(struct i2c_client *client) |
| 263 | { |
| 264 | struct max17040_chip *chip = i2c_get_clientdata(client); |
| 265 | |
| 266 | schedule_delayed_work(&chip->work, MAX17040_DELAY); |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | #else |
| 271 | |
| 272 | #define max17040_suspend NULL |
| 273 | #define max17040_resume NULL |
| 274 | |
| 275 | #endif /* CONFIG_PM */ |
| 276 | |
| 277 | static const struct i2c_device_id max17040_id[] = { |
| 278 | { "max17040", 0 }, |
| 279 | { } |
| 280 | }; |
| 281 | MODULE_DEVICE_TABLE(i2c, max17040_id); |
| 282 | |
| 283 | static struct i2c_driver max17040_i2c_driver = { |
| 284 | .driver = { |
| 285 | .name = "max17040", |
| 286 | }, |
| 287 | .probe = max17040_probe, |
| 288 | .remove = __devexit_p(max17040_remove), |
| 289 | .suspend = max17040_suspend, |
| 290 | .resume = max17040_resume, |
| 291 | .id_table = max17040_id, |
| 292 | }; |
| 293 | module_i2c_driver(max17040_i2c_driver); |
| 294 | |
| 295 | MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>"); |
| 296 | MODULE_DESCRIPTION("MAX17040 Fuel Gauge"); |
| 297 | MODULE_LICENSE("GPL"); |
| 298 |
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