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_IDA(battery_id);
  17
  18 static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
  19 {
  20         struct bq27xxx_device_info *di = data;
  21
  22         bq27xxx_battery_update(di);
  23
  24         return IRQ_HANDLED;
  25 }
  26
  27 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
  28                                     bool single)
  29 {
  30         struct i2c_client *client = to_i2c_client(di->dev);
  31         struct i2c_msg msg[2];
  32         u8 data[2];
  33         int ret;
  34
  35         if (!client->adapter)
  36                 return -ENODEV;
  37
  38         msg[0].addr = client->addr;
  39         msg[0].flags = 0;
  40         msg[0].buf = &reg;
  41         msg[0].len = sizeof(reg);
  42         msg[1].addr = client->addr;
  43         msg[1].flags = I2C_M_RD;
  44         msg[1].buf = data;
  45         if (single)
  46                 msg[1].len = 1;
  47         else
  48                 msg[1].len = 2;
  49
  50         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
  51         if (ret < 0)
  52                 return ret;
  53
  54         if (!single)
  55                 ret = get_unaligned_le16(data);
  56         else
  57                 ret = data[0];
  58
  59         return ret;
  60 }
  61
  62 static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
  63                                      int value, bool single)
  64 {
  65         struct i2c_client *client = to_i2c_client(di->dev);
  66         struct i2c_msg msg;
  67         u8 data[4];
  68         int ret;
  69
  70         if (!client->adapter)
  71                 return -ENODEV;
  72
  73         data[0] = reg;
  74         if (single) {
  75                 data[1] = (u8) value;
  76                 msg.len = 2;
  77         } else {
  78                 put_unaligned_le16(value, &data[1]);
  79                 msg.len = 3;
  80         }
  81
  82         msg.buf = data;
  83         msg.addr = client->addr;
  84         msg.flags = 0;
  85
  86         ret = i2c_transfer(client->adapter, &msg, 1);
  87         if (ret < 0)
  88                 return ret;
  89         if (ret != 1)
  90                 return -EINVAL;
  91         return 0;
  92 }
  93
  94 static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
  95                                          u8 *data, int len)
  96 {
  97         struct i2c_client *client = to_i2c_client(di->dev);
  98         int ret;
  99
 100         if (!client->adapter)
 101                 return -ENODEV;
 102
 103         ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
 104         if (ret < 0)
 105                 return ret;
 106         if (ret != len)
 107                 return -EINVAL;
 108         return 0;
 109 }
 110
 111 static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
 112                                           u8 reg, u8 *data, int len)
 113 {
 114         struct i2c_client *client = to_i2c_client(di->dev);
 115         struct i2c_msg msg;
 116         u8 buf[33];
 117         int ret;
 118
 119         if (!client->adapter)
 120                 return -ENODEV;
 121
 122         buf[0] = reg;
 123         memcpy(&buf[1], data, len);
 124
 125         msg.buf = buf;
 126         msg.addr = client->addr;
 127         msg.flags = 0;
 128         msg.len = len + 1;
 129
 130         ret = i2c_transfer(client->adapter, &msg, 1);
 131         if (ret < 0)
 132                 return ret;
 133         if (ret != 1)
 134                 return -EINVAL;
 135         return 0;
 136 }
 137
 138 static void bq27xxx_battery_i2c_devm_ida_free(void *data)
 139 {
 140         int num = (long)data;
 141
 142         ida_free(&battery_id, num);
 143 }
 144
 145 static int bq27xxx_battery_i2c_probe(struct i2c_client *client)
 146 {
 147         const struct i2c_device_id *id = i2c_client_get_device_id(client);
 148         struct bq27xxx_device_info *di;
 149         int ret;
 150         char *name;
 151         long num;
 152
 153         /* Get new ID for the new battery device */
 154         num = ida_alloc(&battery_id, GFP_KERNEL);
 155         if (num < 0)
 156                 return num;
 157         ret = devm_add_action_or_reset(&client->dev,
 158                                        bq27xxx_battery_i2c_devm_ida_free,
 159                                        (void *)num);
 160         if (ret)
 161                 return ret;
 162
 163         name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%ld", id->name, num);
 164         if (!name)
 165                 return -ENOMEM;
 166
 167         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
 168         if (!di)
 169                 return -ENOMEM;
 170
 171         di->dev = &client->dev;
 172         di->chip = id->driver_data;
 173         di->name = name;
 174
 175         di->bus.read = bq27xxx_battery_i2c_read;
 176         di->bus.write = bq27xxx_battery_i2c_write;
 177         di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
 178         di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
 179
 180         ret = bq27xxx_battery_setup(di);
 181         if (ret)
 182                 return ret;
 183
 184         /* Schedule a polling after about 1 min */
 185         schedule_delayed_work(&di->work, 60 * HZ);
 186
 187         i2c_set_clientdata(client, di);
 188
 189         if (client->irq) {
 190                 ret = request_threaded_irq(client->irq,
 191                                 NULL, bq27xxx_battery_irq_handler_thread,
 192                                 IRQF_ONESHOT,
 193                                 di->name, di);
 194                 if (ret) {
 195                         dev_err(&client->dev,
 196                                 "Unable to register IRQ %d error %d\n",
 197                                 client->irq, ret);
 198                         bq27xxx_battery_teardown(di);
 199                         return ret;
 200                 }
 201         }
 202
 203         return 0;
 204 }
 205
 206 static void bq27xxx_battery_i2c_remove(struct i2c_client *client)
 207 {
 208         struct bq27xxx_device_info *di = i2c_get_clientdata(client);
 209
 210         if (client->irq)
 211                 free_irq(client->irq, di);
 212
 213         bq27xxx_battery_teardown(di);
 214 }
 215
 216 static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
 217         { "bq27200", BQ27000 },
 218         { "bq27210", BQ27010 },
 219         { "bq27500", BQ2750X },
 220         { "bq27510", BQ2751X },
 221         { "bq27520", BQ2752X },
 222         { "bq27500-1", BQ27500 },
 223         { "bq27510g1", BQ27510G1 },
 224         { "bq27510g2", BQ27510G2 },
 225         { "bq27510g3", BQ27510G3 },
 226         { "bq27520g1", BQ27520G1 },
 227         { "bq27520g2", BQ27520G2 },
 228         { "bq27520g3", BQ27520G3 },
 229         { "bq27520g4", BQ27520G4 },
 230         { "bq27521", BQ27521 },
 231         { "bq27530", BQ27530 },
 232         { "bq27531", BQ27531 },
 233         { "bq27541", BQ27541 },
 234         { "bq27542", BQ27542 },
 235         { "bq27546", BQ27546 },
 236         { "bq27742", BQ27742 },
 237         { "bq27545", BQ27545 },
 238         { "bq27411", BQ27411 },
 239         { "bq27421", BQ27421 },
 240         { "bq27425", BQ27425 },
 241         { "bq27426", BQ27426 },
 242         { "bq27441", BQ27441 },
 243         { "bq27621", BQ27621 },
 244         { "bq27z561", BQ27Z561 },
 245         { "bq28z610", BQ28Z610 },
 246         { "bq34z100", BQ34Z100 },
 247         { "bq78z100", BQ78Z100 },
 248         {},
 249 };
 250 MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
 251
 252 #ifdef CONFIG_OF
 253 static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
 254         { .compatible = "ti,bq27200" },
 255         { .compatible = "ti,bq27210" },
 256         { .compatible = "ti,bq27500" },
 257         { .compatible = "ti,bq27510" },
 258         { .compatible = "ti,bq27520" },
 259         { .compatible = "ti,bq27500-1" },
 260         { .compatible = "ti,bq27510g1" },
 261         { .compatible = "ti,bq27510g2" },
 262         { .compatible = "ti,bq27510g3" },
 263         { .compatible = "ti,bq27520g1" },
 264         { .compatible = "ti,bq27520g2" },
 265         { .compatible = "ti,bq27520g3" },
 266         { .compatible = "ti,bq27520g4" },
 267         { .compatible = "ti,bq27521" },
 268         { .compatible = "ti,bq27530" },
 269         { .compatible = "ti,bq27531" },
 270         { .compatible = "ti,bq27541" },
 271         { .compatible = "ti,bq27542" },
 272         { .compatible = "ti,bq27546" },
 273         { .compatible = "ti,bq27742" },
 274         { .compatible = "ti,bq27545" },
 275         { .compatible = "ti,bq27411" },
 276         { .compatible = "ti,bq27421" },
 277         { .compatible = "ti,bq27425" },
 278         { .compatible = "ti,bq27426" },
 279         { .compatible = "ti,bq27441" },
 280         { .compatible = "ti,bq27621" },
 281         { .compatible = "ti,bq27z561" },
 282         { .compatible = "ti,bq28z610" },
 283         { .compatible = "ti,bq34z100" },
 284         { .compatible = "ti,bq78z100" },
 285         {},
 286 };
 287 MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
 288 #endif
 289
 290 static struct i2c_driver bq27xxx_battery_i2c_driver = {
 291         .driver = {
 292                 .name = "bq27xxx-battery",
 293                 .of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
 294                 .pm = &bq27xxx_battery_battery_pm_ops,
 295         },
 296         .probe = bq27xxx_battery_i2c_probe,
 297         .remove = bq27xxx_battery_i2c_remove,
 298         .id_table = bq27xxx_i2c_id_table,
 299 };
 300 module_i2c_driver(bq27xxx_battery_i2c_driver);
 301
 302 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 303 MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
 304 MODULE_LICENSE("GPL");