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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | /* * BQ27xxx battery monitor I2C driver * * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ * Andrew F. Davis <afd@ti.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/module.h> #include <asm/unaligned.h> #include <linux/power/bq27xxx_battery.h> static DEFINE_IDR(battery_id); static DEFINE_MUTEX(battery_mutex); static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data) { struct bq27xxx_device_info *di = data; bq27xxx_battery_update(di); return IRQ_HANDLED; } static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg, bool single) { struct i2c_client *client = to_i2c_client(di->dev); struct i2c_msg msg[2]; unsigned char data[2]; int ret; if (!client->adapter) return -ENODEV; msg[0].addr = client->addr; msg[0].flags = 0; msg[0].buf = ® msg[0].len = sizeof(reg); msg[1].addr = client->addr; msg[1].flags = I2C_M_RD; msg[1].buf = data; if (single) msg[1].len = 1; else msg[1].len = 2; ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); if (ret < 0) return ret; if (!single) ret = get_unaligned_le16(data); else ret = data[0]; return ret; } static int bq27xxx_battery_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct bq27xxx_device_info *di; int ret; char *name; int num; /* Get new ID for the new battery device */ mutex_lock(&battery_mutex); num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL); mutex_unlock(&battery_mutex); if (num < 0) return num; name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num); if (!name) goto err_mem; di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL); if (!di) goto err_mem; di->id = num; di->dev = &client->dev; di->chip = id->driver_data; di->name = name; di->bus.read = bq27xxx_battery_i2c_read; ret = bq27xxx_battery_setup(di); if (ret) goto err_failed; /* Schedule a polling after about 1 min */ schedule_delayed_work(&di->work, 60 * HZ); i2c_set_clientdata(client, di); if (client->irq) { ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, bq27xxx_battery_irq_handler_thread, IRQF_ONESHOT, di->name, di); if (ret) { dev_err(&client->dev, "Unable to register IRQ %d error %d\n", client->irq, ret); return ret; } } return 0; err_mem: ret = -ENOMEM; err_failed: mutex_lock(&battery_mutex); idr_remove(&battery_id, num); mutex_unlock(&battery_mutex); return ret; } static int bq27xxx_battery_i2c_remove(struct i2c_client *client) { struct bq27xxx_device_info *di = i2c_get_clientdata(client); bq27xxx_battery_teardown(di); mutex_lock(&battery_mutex); idr_remove(&battery_id, di->id); mutex_unlock(&battery_mutex); return 0; } static const struct i2c_device_id bq27xxx_i2c_id_table[] = { { "bq27200", BQ27000 }, { "bq27210", BQ27010 }, { "bq27500", BQ27500 }, { "bq27510", BQ27510 }, { "bq27520", BQ27510 }, { "bq27530", BQ27530 }, { "bq27531", BQ27530 }, { "bq27541", BQ27541 }, { "bq27542", BQ27541 }, { "bq27546", BQ27541 }, { "bq27742", BQ27541 }, { "bq27545", BQ27545 }, { "bq27421", BQ27421 }, { "bq27425", BQ27421 }, { "bq27441", BQ27421 }, { "bq27621", BQ27421 }, {}, }; MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table); #ifdef CONFIG_OF static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = { { .compatible = "ti,bq27200" }, { .compatible = "ti,bq27210" }, { .compatible = "ti,bq27500" }, { .compatible = "ti,bq27510" }, { .compatible = "ti,bq27520" }, { .compatible = "ti,bq27530" }, { .compatible = "ti,bq27531" }, { .compatible = "ti,bq27541" }, { .compatible = "ti,bq27542" }, { .compatible = "ti,bq27546" }, { .compatible = "ti,bq27742" }, { .compatible = "ti,bq27545" }, { .compatible = "ti,bq27421" }, { .compatible = "ti,bq27425" }, { .compatible = "ti,bq27441" }, { .compatible = "ti,bq27621" }, {}, }; MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table); #endif static struct i2c_driver bq27xxx_battery_i2c_driver = { .driver = { .name = "bq27xxx-battery", .of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table), }, .probe = bq27xxx_battery_i2c_probe, .remove = bq27xxx_battery_i2c_remove, .id_table = bq27xxx_i2c_id_table, }; module_i2c_driver(bq27xxx_battery_i2c_driver); MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver"); MODULE_LICENSE("GPL"); |