projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 703df6c0 AD |
1 | /* |
| 2 | * SCI Reset driver for Keystone based devices | |
| 3 | * | |
| 4 | * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ | |
| 5 | * Andrew F. Davis <afd@ti.com> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | * | |
| 11 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
| 12 | * kind, whether express or implied; without even the implied warranty | |
| 13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | * GNU General Public License for more details. | |
| 15 | */ | |
| 16 | ||
| 17 | #include <linux/i2c.h> | |
| 18 | #include <linux/interrupt.h> | |
| 19 | #include <linux/module.h> | |
| 20 | #include <asm/unaligned.h> | |
| 21 | ||
| 22 | #include <linux/power/bq27xxx_battery.h> | |
| 23 | ||
| 24 | static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data) | |
| 25 | { | |
| 26 | struct bq27xxx_device_info *di = data; | |
| 27 | ||
| 28 | bq27xxx_battery_update(di); | |
| 29 | ||
| 30 | return IRQ_HANDLED; | |
| 31 | } | |
| 32 | ||
| 33 | static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg, | |
| 34 | bool single) | |
| 35 | { | |
| 36 | struct i2c_client *client = to_i2c_client(di->dev); | |
| 37 | struct i2c_msg msg[2]; | |
| 38 | unsigned char data[2]; | |
| 39 | int ret; | |
| 40 | ||
| 41 | if (!client->adapter) | |
| 42 | return -ENODEV; | |
| 43 | ||
| 44 | msg[0].addr = client->addr; | |
| 45 | msg[0].flags = 0; | |
| 46 | msg[0].buf = ® | |
| 47 | msg[0].len = sizeof(reg); | |
| 48 | msg[1].addr = client->addr; | |
| 49 | msg[1].flags = I2C_M_RD; | |
| 50 | msg[1].buf = data; | |
| 51 | if (single) | |
| 52 | msg[1].len = 1; | |
| 53 | else | |
| 54 | msg[1].len = 2; | |
| 55 | ||
| 56 | ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); | |
| 57 | if (ret < 0) | |
| 58 | return ret; | |
| 59 | ||
| 60 | if (!single) | |
| 61 | ret = get_unaligned_le16(data); | |
| 62 | else | |
| 63 | ret = data[0]; | |
| 64 | ||
| 65 | return ret; | |
| 66 | } | |
| 67 | ||
| 68 | static int bq27xxx_battery_i2c_probe(struct i2c_client *client, | |
| 69 | const struct i2c_device_id *id) | |
| 70 | { | |
| 71 | struct bq27xxx_device_info *di; | |
| 72 | int ret; | |
| 73 | ||
| 74 | di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL); | |
| 75 | if (!di) | |
| 76 | return -ENOMEM; | |
| 77 | ||
| 78 | di->dev = &client->dev; | |
| 79 | di->chip = id->driver_data; | |
| 80 | di->name = id->name; | |
| 81 | di->bus.read = bq27xxx_battery_i2c_read; | |
| 82 | ||
| 83 | ret = bq27xxx_battery_setup(di); | |
| 84 | if (ret) | |
| 85 | return ret; | |
| 86 | ||
| 87 | /* Schedule a polling after about 1 min */ | |
| 88 | schedule_delayed_work(&di->work, 60 * HZ); | |
| 89 | ||
| 90 | i2c_set_clientdata(client, di); | |
| 91 | ||
| 92 | if (client->irq) { | |
| 93 | ret = devm_request_threaded_irq(&client->dev, client->irq, | |
| 94 | NULL, bq27xxx_battery_irq_handler_thread, | |
| 95 | IRQF_ONESHOT, | |
| 96 | di->name, di); | |
| 97 | if (ret) { | |
| 98 | dev_err(&client->dev, | |
| 99 | "Unable to register IRQ %d error %d\n", | |
| 100 | client->irq, ret); | |
| 101 | return ret; | |
| 102 | } | |
| 103 | } | |
| 104 | ||
| 105 | return 0; | |
| 106 | } | |
| 107 | ||
| 108 | static int bq27xxx_battery_i2c_remove(struct i2c_client *client) | |
| 109 | { | |
| 110 | struct bq27xxx_device_info *di = i2c_get_clientdata(client); | |
| 111 | ||
| 112 | bq27xxx_battery_teardown(di); | |
| 113 | ||
| 114 | return 0; | |
| 115 | } | |
| 116 | ||
| 117 | static const struct i2c_device_id bq27xxx_i2c_id_table[] = { | |
| 118 | { "bq27200", BQ27000 }, | |
| 119 | { "bq27210", BQ27010 }, | |
| 120 | { "bq27500", BQ27500 }, | |
| 121 | { "bq27510", BQ27500 }, | |
| 122 | { "bq27520", BQ27500 }, | |
| 123 | { "bq27530", BQ27530 }, | |
| 124 | { "bq27531", BQ27530 }, | |
| 125 | { "bq27541", BQ27541 }, | |
| 126 | { "bq27542", BQ27541 }, | |
| 127 | { "bq27546", BQ27541 }, | |
| 128 | { "bq27742", BQ27541 }, | |
| 129 | { "bq27545", BQ27545 }, | |
| 130 | { "bq27421", BQ27421 }, | |
| 131 | { "bq27425", BQ27421 }, | |
| 132 | { "bq27441", BQ27421 }, | |
| 133 | { "bq27621", BQ27421 }, | |
| 134 | {}, | |
| 135 | }; | |
| 136 | MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table); | |
| 137 | ||
| 138 | static struct i2c_driver bq27xxx_battery_i2c_driver = { | |
| 139 | .driver = { | |
| 140 | .name = "bq27xxx-battery", | |
| 141 | }, | |
| 142 | .probe = bq27xxx_battery_i2c_probe, | |
| 143 | .remove = bq27xxx_battery_i2c_remove, | |
| 144 | .id_table = bq27xxx_i2c_id_table, | |
| 145 | }; | |
| 146 | module_i2c_driver(bq27xxx_battery_i2c_driver); | |
| 147 | ||
| 148 | MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); | |
| 149 | MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver"); | |
| 150 | MODULE_LICENSE("GPL"); |