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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"); |