drivers/power/supply/bq27xxx_battery_i2c.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * BQ27xxx battery monitor I2C driver
   4  *
   5  * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
   6  *      Andrew F. Davis <afd@ti.com>
   7  */
   8
   9 #include <linux/i2c.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <asm/unaligned.h>
  13
  14 #include <linux/power/bq27xxx_battery.h>
  15
  16 static DEFINE_IDR(battery_id);
  17 static DEFINE_MUTEX(battery_mutex);
  18
  19 static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
  20 {
  21         struct bq27xxx_device_info *di = data;
  22
  23         bq27xxx_battery_update(di);
  24
  25         return IRQ_HANDLED;
  26 }
  27
  28 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
  29                                     bool single)
  30 {
  31         struct i2c_client *client = to_i2c_client(di->dev);
  32         struct i2c_msg msg[2];
  33         u8 data[2];
  34         int ret;
  35
  36         if (!client->adapter)
  37                 return -ENODEV;
  38
  39         msg[0].addr = client->addr;
  40         msg[0].flags = 0;
  41         msg[0].buf = &reg;
  42         msg[0].len = sizeof(reg);
  43         msg[1].addr = client->addr;
  44         msg[1].flags = I2C_M_RD;
  45         msg[1].buf = data;
  46         if (single)
  47                 msg[1].len = 1;
  48         else
  49                 msg[1].len = 2;
  50
  51         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
  52         if (ret < 0)
  53                 return ret;
  54
  55         if (!single)
  56                 ret = get_unaligned_le16(data);
  57         else
  58                 ret = data[0];
  59
  60         return ret;
  61 }
  62
  63 static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
  64                                      int value, bool single)
  65 {
  66         struct i2c_client *client = to_i2c_client(di->dev);
  67         struct i2c_msg msg;
  68         u8 data[4];
  69         int ret;
  70
  71         if (!client->adapter)
  72                 return -ENODEV;
  73
  74         data[0] = reg;
  75         if (single) {
  76                 data[1] = (u8) value;
  77                 msg.len = 2;
  78         } else {
  79                 put_unaligned_le16(value, &data[1]);
  80                 msg.len = 3;
  81         }
  82
  83         msg.buf = data;
  84         msg.addr = client->addr;
  85         msg.flags = 0;
  86
  87         ret = i2c_transfer(client->adapter, &msg, 1);
  88         if (ret < 0)
  89                 return ret;
  90         if (ret != 1)
  91                 return -EINVAL;
  92         return 0;
  93 }
  94
  95 static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
  96                                          u8 *data, int len)
  97 {
  98         struct i2c_client *client = to_i2c_client(di->dev);
  99         int ret;
 100
 101         if (!client->adapter)
 102                 return -ENODEV;
 103
 104         ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
 105         if (ret < 0)
 106                 return ret;
 107         if (ret != len)
 108                 return -EINVAL;
 109         return 0;
 110 }
 111
 112 static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
 113                                           u8 reg, u8 *data, int len)
 114 {
 115         struct i2c_client *client = to_i2c_client(di->dev);
 116         struct i2c_msg msg;
 117         u8 buf[33];
 118         int ret;
 119
 120         if (!client->adapter)
 121                 return -ENODEV;
 122
 123         buf[0] = reg;
 124         memcpy(&buf[1], data, len);
 125
 126         msg.buf = buf;
 127         msg.addr = client->addr;
 128         msg.flags = 0;
 129         msg.len = len + 1;
 130
 131         ret = i2c_transfer(client->adapter, &msg, 1);
 132         if (ret < 0)
 133                 return ret;
 134         if (ret != 1)
 135                 return -EINVAL;
 136         return 0;
 137 }
 138
 139 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
 140                                      const struct i2c_device_id *id)
 141 {
 142         struct bq27xxx_device_info *di;
 143         int ret;
 144         char *name;
 145         int num;
 146
 147         /* Get new ID for the new battery device */
 148         mutex_lock(&battery_mutex);
 149         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 150         mutex_unlock(&battery_mutex);
 151         if (num < 0)
 152                 return num;
 153
 154         name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
 155         if (!name)
 156                 goto err_mem;
 157
 158         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
 159         if (!di)
 160                 goto err_mem;
 161
 162         di->id = num;
 163         di->dev = &client->dev;
 164         di->chip = id->driver_data;
 165         di->name = name;
 166
 167         di->bus.read = bq27xxx_battery_i2c_read;
 168         di->bus.write = bq27xxx_battery_i2c_write;
 169         di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
 170         di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
 171
 172         ret = bq27xxx_battery_setup(di);
 173         if (ret)
 174                 goto err_failed;
 175
 176         /* Schedule a polling after about 1 min */
 177         schedule_delayed_work(&di->work, 60 * HZ);
 178
 179         i2c_set_clientdata(client, di);
 180
 181         if (client->irq) {
 182                 ret = devm_request_threaded_irq(&client->dev, client->irq,
 183                                 NULL, bq27xxx_battery_irq_handler_thread,
 184                                 IRQF_ONESHOT,
 185                                 di->name, di);
 186                 if (ret) {
 187                         dev_err(&client->dev,
 188                                 "Unable to register IRQ %d error %d\n",
 189                                 client->irq, ret);
 190                         return ret;
 191                 }
 192         }
 193
 194         return 0;
 195
 196 err_mem:
 197         ret = -ENOMEM;
 198
 199 err_failed:
 200         mutex_lock(&battery_mutex);
 201         idr_remove(&battery_id, num);
 202         mutex_unlock(&battery_mutex);
 203
 204         return ret;
 205 }
 206
 207 static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
 208 {
 209         struct bq27xxx_device_info *di = i2c_get_clientdata(client);
 210
 211         bq27xxx_battery_teardown(di);
 212
 213         mutex_lock(&battery_mutex);
 214         idr_remove(&battery_id, di->id);
 215         mutex_unlock(&battery_mutex);
 216
 217         return 0;
 218 }
 219
 220 static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
 221         { "bq27200", BQ27000 },
 222         { "bq27210", BQ27010 },
 223         { "bq27500", BQ2750X },
 224         { "bq27510", BQ2751X },
 225         { "bq27520", BQ2752X },
 226         { "bq27500-1", BQ27500 },
 227         { "bq27510g1", BQ27510G1 },
 228         { "bq27510g2", BQ27510G2 },
 229         { "bq27510g3", BQ27510G3 },
 230         { "bq27520g1", BQ27520G1 },
 231         { "bq27520g2", BQ27520G2 },
 232         { "bq27520g3", BQ27520G3 },
 233         { "bq27520g4", BQ27520G4 },
 234         { "bq27521", BQ27521 },
 235         { "bq27530", BQ27530 },
 236         { "bq27531", BQ27531 },
 237         { "bq27541", BQ27541 },
 238         { "bq27542", BQ27542 },
 239         { "bq27546", BQ27546 },
 240         { "bq27742", BQ27742 },
 241         { "bq27545", BQ27545 },
 242         { "bq27411", BQ27411 },
 243         { "bq27421", BQ27421 },
 244         { "bq27425", BQ27425 },
 245         { "bq27426", BQ27426 },
 246         { "bq27441", BQ27441 },
 247         { "bq27621", BQ27621 },
 248         { "bq27z561", BQ27Z561 },
 249         { "bq28z610", BQ28Z610 },
 250         { "bq34z100", BQ34Z100 },
 251         {},
 252 };
 253 MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
 254
 255 #ifdef CONFIG_OF
 256 static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
 257         { .compatible = "ti,bq27200" },
 258         { .compatible = "ti,bq27210" },
 259         { .compatible = "ti,bq27500" },
 260         { .compatible = "ti,bq27510" },
 261         { .compatible = "ti,bq27520" },
 262         { .compatible = "ti,bq27500-1" },
 263         { .compatible = "ti,bq27510g1" },
 264         { .compatible = "ti,bq27510g2" },
 265         { .compatible = "ti,bq27510g3" },
 266         { .compatible = "ti,bq27520g1" },
 267         { .compatible = "ti,bq27520g2" },
 268         { .compatible = "ti,bq27520g3" },
 269         { .compatible = "ti,bq27520g4" },
 270         { .compatible = "ti,bq27521" },
 271         { .compatible = "ti,bq27530" },
 272         { .compatible = "ti,bq27531" },
 273         { .compatible = "ti,bq27541" },
 274         { .compatible = "ti,bq27542" },
 275         { .compatible = "ti,bq27546" },
 276         { .compatible = "ti,bq27742" },
 277         { .compatible = "ti,bq27545" },
 278         { .compatible = "ti,bq27411" },
 279         { .compatible = "ti,bq27421" },
 280         { .compatible = "ti,bq27425" },
 281         { .compatible = "ti,bq27426" },
 282         { .compatible = "ti,bq27441" },
 283         { .compatible = "ti,bq27621" },
 284         { .compatible = "ti,bq27z561" },
 285         { .compatible = "ti,bq28z610" },
 286         { .compatible = "ti,bq34z100" },
 287         {},
 288 };
 289 MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
 290 #endif
 291
 292 static struct i2c_driver bq27xxx_battery_i2c_driver = {
 293         .driver = {
 294                 .name = "bq27xxx-battery",
 295                 .of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
 296         },
 297         .probe = bq27xxx_battery_i2c_probe,
 298         .remove = bq27xxx_battery_i2c_remove,
 299         .id_table = bq27xxx_i2c_id_table,
 300 };
 301 module_i2c_driver(bq27xxx_battery_i2c_driver);
 302
 303 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 304 MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
 305 MODULE_LICENSE("GPL");