306 lines
6.9 KiB
C
306 lines
6.9 KiB
C
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/*
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* BQ27xxx battery monitor I2C driver
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*
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* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <asm/unaligned.h>
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#include <linux/power/bq27xxx_battery.h>
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static DEFINE_IDR(battery_id);
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static DEFINE_MUTEX(battery_mutex);
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static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
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{
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struct bq27xxx_device_info *di = data;
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bq27xxx_battery_update(di);
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return IRQ_HANDLED;
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}
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static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
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bool single)
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{
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struct i2c_client *client = to_i2c_client(di->dev);
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struct i2c_msg msg[2];
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u8 data[2];
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int ret;
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if (!client->adapter)
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return -ENODEV;
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msg[0].addr = client->addr;
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msg[0].flags = 0;
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msg[0].buf = ®
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msg[0].len = sizeof(reg);
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msg[1].addr = client->addr;
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msg[1].flags = I2C_M_RD;
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msg[1].buf = data;
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if (single)
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msg[1].len = 1;
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else
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msg[1].len = 2;
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ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
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if (ret < 0)
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return ret;
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if (!single)
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ret = get_unaligned_le16(data);
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else
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ret = data[0];
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return ret;
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}
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static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
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int value, bool single)
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{
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struct i2c_client *client = to_i2c_client(di->dev);
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struct i2c_msg msg;
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u8 data[4];
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int ret;
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if (!client->adapter)
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return -ENODEV;
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data[0] = reg;
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if (single) {
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data[1] = (u8) value;
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msg.len = 2;
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} else {
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put_unaligned_le16(value, &data[1]);
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msg.len = 3;
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}
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msg.buf = data;
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msg.addr = client->addr;
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msg.flags = 0;
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ret = i2c_transfer(client->adapter, &msg, 1);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EINVAL;
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return 0;
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}
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static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
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u8 *data, int len)
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{
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struct i2c_client *client = to_i2c_client(di->dev);
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int ret;
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if (!client->adapter)
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return -ENODEV;
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ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
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if (ret < 0)
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return ret;
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if (ret != len)
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return -EINVAL;
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return 0;
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}
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static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
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u8 reg, u8 *data, int len)
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{
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struct i2c_client *client = to_i2c_client(di->dev);
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struct i2c_msg msg;
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u8 buf[33];
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int ret;
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if (!client->adapter)
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return -ENODEV;
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buf[0] = reg;
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memcpy(&buf[1], data, len);
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msg.buf = buf;
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msg.addr = client->addr;
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msg.flags = 0;
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msg.len = len + 1;
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ret = i2c_transfer(client->adapter, &msg, 1);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EINVAL;
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return 0;
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}
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static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct bq27xxx_device_info *di;
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int ret;
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char *name;
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int num;
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/* Get new ID for the new battery device */
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mutex_lock(&battery_mutex);
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num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
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mutex_unlock(&battery_mutex);
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if (num < 0)
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return num;
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name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
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if (!name)
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goto err_mem;
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di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
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if (!di)
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goto err_mem;
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di->id = num;
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di->dev = &client->dev;
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di->chip = id->driver_data;
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di->name = name;
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di->bus.read = bq27xxx_battery_i2c_read;
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di->bus.write = bq27xxx_battery_i2c_write;
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di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
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di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
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ret = bq27xxx_battery_setup(di);
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if (ret)
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goto err_failed;
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/* Schedule a polling after about 1 min */
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schedule_delayed_work(&di->work, 60 * HZ);
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i2c_set_clientdata(client, di);
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if (client->irq) {
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ret = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, bq27xxx_battery_irq_handler_thread,
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IRQF_ONESHOT,
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di->name, di);
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if (ret) {
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dev_err(&client->dev,
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"Unable to register IRQ %d error %d\n",
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client->irq, ret);
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return ret;
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}
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}
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return 0;
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err_mem:
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ret = -ENOMEM;
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err_failed:
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mutex_lock(&battery_mutex);
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idr_remove(&battery_id, num);
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mutex_unlock(&battery_mutex);
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return ret;
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}
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static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
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{
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struct bq27xxx_device_info *di = i2c_get_clientdata(client);
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bq27xxx_battery_teardown(di);
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mutex_lock(&battery_mutex);
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idr_remove(&battery_id, di->id);
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mutex_unlock(&battery_mutex);
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return 0;
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}
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static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
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{ "bq27200", BQ27000 },
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{ "bq27210", BQ27010 },
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{ "bq27500", BQ2750X },
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{ "bq27510", BQ2751X },
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{ "bq27520", BQ2752X },
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{ "bq27500-1", BQ27500 },
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{ "bq27510g1", BQ27510G1 },
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{ "bq27510g2", BQ27510G2 },
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{ "bq27510g3", BQ27510G3 },
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{ "bq27520g1", BQ27520G1 },
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{ "bq27520g2", BQ27520G2 },
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{ "bq27520g3", BQ27520G3 },
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{ "bq27520g4", BQ27520G4 },
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{ "bq27521", BQ27521 },
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{ "bq27530", BQ27530 },
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{ "bq27531", BQ27531 },
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{ "bq27541", BQ27541 },
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{ "bq27542", BQ27542 },
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{ "bq27546", BQ27546 },
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{ "bq27742", BQ27742 },
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{ "bq27545", BQ27545 },
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{ "bq27421", BQ27421 },
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{ "bq27425", BQ27425 },
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{ "bq27426", BQ27426 },
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{ "bq27441", BQ27441 },
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{ "bq27621", BQ27621 },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
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#ifdef CONFIG_OF
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static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
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{ .compatible = "ti,bq27200" },
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{ .compatible = "ti,bq27210" },
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{ .compatible = "ti,bq27500" },
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{ .compatible = "ti,bq27510" },
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{ .compatible = "ti,bq27520" },
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{ .compatible = "ti,bq27500-1" },
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{ .compatible = "ti,bq27510g1" },
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{ .compatible = "ti,bq27510g2" },
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{ .compatible = "ti,bq27510g3" },
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{ .compatible = "ti,bq27520g1" },
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{ .compatible = "ti,bq27520g2" },
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{ .compatible = "ti,bq27520g3" },
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{ .compatible = "ti,bq27520g4" },
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{ .compatible = "ti,bq27521" },
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{ .compatible = "ti,bq27530" },
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{ .compatible = "ti,bq27531" },
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{ .compatible = "ti,bq27541" },
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{ .compatible = "ti,bq27542" },
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{ .compatible = "ti,bq27546" },
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{ .compatible = "ti,bq27742" },
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{ .compatible = "ti,bq27545" },
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{ .compatible = "ti,bq27421" },
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{ .compatible = "ti,bq27425" },
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{ .compatible = "ti,bq27426" },
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{ .compatible = "ti,bq27441" },
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{ .compatible = "ti,bq27621" },
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{},
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};
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MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
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#endif
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static struct i2c_driver bq27xxx_battery_i2c_driver = {
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.driver = {
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.name = "bq27xxx-battery",
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.of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
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},
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.probe = bq27xxx_battery_i2c_probe,
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.remove = bq27xxx_battery_i2c_remove,
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.id_table = bq27xxx_i2c_id_table,
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};
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module_i2c_driver(bq27xxx_battery_i2c_driver);
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MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
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MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
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MODULE_LICENSE("GPL");
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