| /* |
| * 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]; |
| u8 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_write(struct bq27xxx_device_info *di, u8 reg, |
| int value, bool single) |
| { |
| struct i2c_client *client = to_i2c_client(di->dev); |
| struct i2c_msg msg; |
| u8 data[4]; |
| int ret; |
| |
| if (!client->adapter) |
| return -ENODEV; |
| |
| data[0] = reg; |
| if (single) { |
| data[1] = (u8) value; |
| msg.len = 2; |
| } else { |
| put_unaligned_le16(value, &data[1]); |
| msg.len = 3; |
| } |
| |
| msg.buf = data; |
| msg.addr = client->addr; |
| msg.flags = 0; |
| |
| ret = i2c_transfer(client->adapter, &msg, 1); |
| if (ret < 0) |
| return ret; |
| if (ret != 1) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg, |
| u8 *data, int len) |
| { |
| struct i2c_client *client = to_i2c_client(di->dev); |
| int ret; |
| |
| if (!client->adapter) |
| return -ENODEV; |
| |
| ret = i2c_smbus_read_i2c_block_data(client, reg, len, data); |
| if (ret < 0) |
| return ret; |
| if (ret != len) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di, |
| u8 reg, u8 *data, int len) |
| { |
| struct i2c_client *client = to_i2c_client(di->dev); |
| struct i2c_msg msg; |
| u8 buf[33]; |
| int ret; |
| |
| if (!client->adapter) |
| return -ENODEV; |
| |
| buf[0] = reg; |
| memcpy(&buf[1], data, len); |
| |
| msg.buf = buf; |
| msg.addr = client->addr; |
| msg.flags = 0; |
| msg.len = len + 1; |
| |
| ret = i2c_transfer(client->adapter, &msg, 1); |
| if (ret < 0) |
| return ret; |
| if (ret != 1) |
| return -EINVAL; |
| return 0; |
| } |
| |
| 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; |
| di->bus.write = bq27xxx_battery_i2c_write; |
| di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read; |
| di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write; |
| |
| 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", BQ2750X }, |
| { "bq27510", BQ2751X }, |
| { "bq27520", BQ2752X }, |
| { "bq27500-1", BQ27500 }, |
| { "bq27510g1", BQ27510G1 }, |
| { "bq27510g2", BQ27510G2 }, |
| { "bq27510g3", BQ27510G3 }, |
| { "bq27520g1", BQ27520G1 }, |
| { "bq27520g2", BQ27520G2 }, |
| { "bq27520g3", BQ27520G3 }, |
| { "bq27520g4", BQ27520G4 }, |
| { "bq27521", BQ27521 }, |
| { "bq27530", BQ27530 }, |
| { "bq27531", BQ27531 }, |
| { "bq27541", BQ27541 }, |
| { "bq27542", BQ27542 }, |
| { "bq27546", BQ27546 }, |
| { "bq27742", BQ27742 }, |
| { "bq27545", BQ27545 }, |
| { "bq27421", BQ27421 }, |
| { "bq27425", BQ27425 }, |
| { "bq27426", BQ27426 }, |
| { "bq27441", BQ27441 }, |
| { "bq27621", BQ27621 }, |
| {}, |
| }; |
| 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,bq27500-1" }, |
| { .compatible = "ti,bq27510g1" }, |
| { .compatible = "ti,bq27510g2" }, |
| { .compatible = "ti,bq27510g3" }, |
| { .compatible = "ti,bq27520g1" }, |
| { .compatible = "ti,bq27520g2" }, |
| { .compatible = "ti,bq27520g3" }, |
| { .compatible = "ti,bq27520g4" }, |
| { .compatible = "ti,bq27521" }, |
| { .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,bq27426" }, |
| { .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"); |
