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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/*
* Dumb driver for LiIon batteries using TWL4030 madc.
*
* Copyright 2013 Golden Delicious Computers
* Lukas Märdian <lukas@goldelico.com>
*
* Based on dumb driver for gta01 battery
* Copyright 2009 Openmoko, Inc
* Balaji Rao <balajirrao@openmoko.org>
*/
#include <linux/module.h>
#include <linux/param.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/sort.h>
#include <linux/i2c/twl4030-madc.h>
#include <linux/power/twl4030_madc_battery.h>
struct twl4030_madc_battery {
struct power_supply psy;
struct twl4030_madc_bat_platform_data *pdata;
};
static enum power_supply_property twl4030_madc_bat_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
};
static int madc_read(int index)
{
struct twl4030_madc_request req;
int val;
req.channels = index;
req.method = TWL4030_MADC_SW2;
req.type = TWL4030_MADC_WAIT;
req.do_avg = 0;
req.raw = false;
req.func_cb = NULL;
val = twl4030_madc_conversion(&req);
if (val < 0)
return val;
return req.rbuf[ffs(index) - 1];
}
static int twl4030_madc_bat_get_charging_status(void)
{
return (madc_read(TWL4030_MADC_ICHG) > 0) ? 1 : 0;
}
static int twl4030_madc_bat_get_voltage(void)
{
return madc_read(TWL4030_MADC_VBAT);
}
static int twl4030_madc_bat_get_current(void)
{
return madc_read(TWL4030_MADC_ICHG) * 1000;
}
static int twl4030_madc_bat_get_temp(void)
{
return madc_read(TWL4030_MADC_BTEMP) * 10;
}
static int twl4030_madc_bat_voltscale(struct twl4030_madc_battery *bat,
int volt)
{
struct twl4030_madc_bat_calibration *calibration;
int i, res = 0;
/* choose charging curve */
if (twl4030_madc_bat_get_charging_status())
calibration = bat->pdata->charging;
else
calibration = bat->pdata->discharging;
if (volt > calibration[0].voltage) {
res = calibration[0].level;
} else {
for (i = 0; calibration[i+1].voltage >= 0; i++) {
if (volt <= calibration[i].voltage &&
volt >= calibration[i+1].voltage) {
/* interval found - interpolate within range */
res = calibration[i].level -
((calibration[i].voltage - volt) *
(calibration[i].level -
calibration[i+1].level)) /
(calibration[i].voltage -
calibration[i+1].voltage);
break;
}
}
}
return res;
}
static int twl4030_madc_bat_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct twl4030_madc_battery *bat = container_of(psy,
struct twl4030_madc_battery, psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (twl4030_madc_bat_voltscale(bat,
twl4030_madc_bat_get_voltage()) > 95)
val->intval = POWER_SUPPLY_STATUS_FULL;
else {
if (twl4030_madc_bat_get_charging_status())
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
}
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = twl4030_madc_bat_get_voltage() * 1000;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
val->intval = twl4030_madc_bat_get_current();
break;
case POWER_SUPPLY_PROP_PRESENT:
/* assume battery is always present */
val->intval = 1;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW: {
int percent = twl4030_madc_bat_voltscale(bat,
twl4030_madc_bat_get_voltage());
val->intval = (percent * bat->pdata->capacity) / 100;
break;
}
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = twl4030_madc_bat_voltscale(bat,
twl4030_madc_bat_get_voltage());
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
val->intval = bat->pdata->capacity;
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = twl4030_madc_bat_get_temp();
break;
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {
int percent = twl4030_madc_bat_voltscale(bat,
twl4030_madc_bat_get_voltage());
/* in mAh */
int chg = (percent * (bat->pdata->capacity/1000))/100;
/* assume discharge with 400 mA (ca. 1.5W) */
val->intval = (3600l * chg) / 400;
break;
}
default:
return -EINVAL;
}
return 0;
}
static void twl4030_madc_bat_ext_changed(struct power_supply *psy)
{
struct twl4030_madc_battery *bat = container_of(psy,
struct twl4030_madc_battery, psy);
power_supply_changed(&bat->psy);
}
static int twl4030_cmp(const void *a, const void *b)
{
return ((struct twl4030_madc_bat_calibration *)b)->voltage -
((struct twl4030_madc_bat_calibration *)a)->voltage;
}
static int twl4030_madc_battery_probe(struct platform_device *pdev)
{
struct twl4030_madc_battery *twl4030_madc_bat;
struct twl4030_madc_bat_platform_data *pdata = pdev->dev.platform_data;
int ret = 0;
twl4030_madc_bat = kzalloc(sizeof(*twl4030_madc_bat), GFP_KERNEL);
if (!twl4030_madc_bat)
return -ENOMEM;
twl4030_madc_bat->psy.name = "twl4030_battery";
twl4030_madc_bat->psy.type = POWER_SUPPLY_TYPE_BATTERY;
twl4030_madc_bat->psy.properties = twl4030_madc_bat_props;
twl4030_madc_bat->psy.num_properties =
ARRAY_SIZE(twl4030_madc_bat_props);
twl4030_madc_bat->psy.get_property = twl4030_madc_bat_get_property;
twl4030_madc_bat->psy.external_power_changed =
twl4030_madc_bat_ext_changed;
/* sort charging and discharging calibration data */
sort(pdata->charging, pdata->charging_size,
sizeof(struct twl4030_madc_bat_calibration),
twl4030_cmp, NULL);
sort(pdata->discharging, pdata->discharging_size,
sizeof(struct twl4030_madc_bat_calibration),
twl4030_cmp, NULL);
twl4030_madc_bat->pdata = pdata;
platform_set_drvdata(pdev, twl4030_madc_bat);
ret = power_supply_register(&pdev->dev, &twl4030_madc_bat->psy, NULL);
if (ret < 0)
kfree(twl4030_madc_bat);
return ret;
}
static int twl4030_madc_battery_remove(struct platform_device *pdev)
{
struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);
power_supply_unregister(&bat->psy);
kfree(bat);
return 0;
}
static struct platform_driver twl4030_madc_battery_driver = {
.driver = {
.name = "twl4030_madc_battery",
},
.probe = twl4030_madc_battery_probe,
.remove = twl4030_madc_battery_remove,
};
module_platform_driver(twl4030_madc_battery_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Lukas Märdian <lukas@goldelico.com>");
MODULE_DESCRIPTION("twl4030_madc battery driver");
|
