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12#include <linux/module.h>
13#include <linux/param.h>
14#include <linux/delay.h>
15#include <linux/workqueue.h>
16#include <linux/platform_device.h>
17#include <linux/power_supply.h>
18#include <linux/slab.h>
19#include <linux/sort.h>
20#include <linux/i2c/twl4030-madc.h>
21#include <linux/power/twl4030_madc_battery.h>
22#include <linux/iio/consumer.h>
23
24struct twl4030_madc_battery {
25 struct power_supply *psy;
26 struct twl4030_madc_bat_platform_data *pdata;
27 struct iio_channel *channel_temp;
28 struct iio_channel *channel_ichg;
29 struct iio_channel *channel_vbat;
30};
31
32static enum power_supply_property twl4030_madc_bat_props[] = {
33 POWER_SUPPLY_PROP_PRESENT,
34 POWER_SUPPLY_PROP_STATUS,
35 POWER_SUPPLY_PROP_TECHNOLOGY,
36 POWER_SUPPLY_PROP_VOLTAGE_NOW,
37 POWER_SUPPLY_PROP_CURRENT_NOW,
38 POWER_SUPPLY_PROP_CAPACITY,
39 POWER_SUPPLY_PROP_CHARGE_FULL,
40 POWER_SUPPLY_PROP_CHARGE_NOW,
41 POWER_SUPPLY_PROP_TEMP,
42 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
43};
44
45static int madc_read(struct iio_channel *channel)
46{
47 int val, err;
48 err = iio_read_channel_processed(channel, &val);
49 if (err < 0)
50 return err;
51
52 return val;
53}
54
55static int twl4030_madc_bat_get_charging_status(struct twl4030_madc_battery *bt)
56{
57 return (madc_read(bt->channel_ichg) > 0) ? 1 : 0;
58}
59
60static int twl4030_madc_bat_get_voltage(struct twl4030_madc_battery *bt)
61{
62 return madc_read(bt->channel_vbat);
63}
64
65static int twl4030_madc_bat_get_current(struct twl4030_madc_battery *bt)
66{
67 return madc_read(bt->channel_ichg) * 1000;
68}
69
70static int twl4030_madc_bat_get_temp(struct twl4030_madc_battery *bt)
71{
72 return madc_read(bt->channel_temp) * 10;
73}
74
75static int twl4030_madc_bat_voltscale(struct twl4030_madc_battery *bat,
76 int volt)
77{
78 struct twl4030_madc_bat_calibration *calibration;
79 int i, res = 0;
80
81
82 if (twl4030_madc_bat_get_charging_status(bat))
83 calibration = bat->pdata->charging;
84 else
85 calibration = bat->pdata->discharging;
86
87 if (volt > calibration[0].voltage) {
88 res = calibration[0].level;
89 } else {
90 for (i = 0; calibration[i+1].voltage >= 0; i++) {
91 if (volt <= calibration[i].voltage &&
92 volt >= calibration[i+1].voltage) {
93
94 res = calibration[i].level -
95 ((calibration[i].voltage - volt) *
96 (calibration[i].level -
97 calibration[i+1].level)) /
98 (calibration[i].voltage -
99 calibration[i+1].voltage);
100 break;
101 }
102 }
103 }
104 return res;
105}
106
107static int twl4030_madc_bat_get_property(struct power_supply *psy,
108 enum power_supply_property psp,
109 union power_supply_propval *val)
110{
111 struct twl4030_madc_battery *bat = power_supply_get_drvdata(psy);
112
113 switch (psp) {
114 case POWER_SUPPLY_PROP_STATUS:
115 if (twl4030_madc_bat_voltscale(bat,
116 twl4030_madc_bat_get_voltage(bat)) > 95)
117 val->intval = POWER_SUPPLY_STATUS_FULL;
118 else {
119 if (twl4030_madc_bat_get_charging_status(bat))
120 val->intval = POWER_SUPPLY_STATUS_CHARGING;
121 else
122 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
123 }
124 break;
125 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
126 val->intval = twl4030_madc_bat_get_voltage(bat) * 1000;
127 break;
128 case POWER_SUPPLY_PROP_TECHNOLOGY:
129 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
130 break;
131 case POWER_SUPPLY_PROP_CURRENT_NOW:
132 val->intval = twl4030_madc_bat_get_current(bat);
133 break;
134 case POWER_SUPPLY_PROP_PRESENT:
135
136 val->intval = 1;
137 break;
138 case POWER_SUPPLY_PROP_CHARGE_NOW: {
139 int percent = twl4030_madc_bat_voltscale(bat,
140 twl4030_madc_bat_get_voltage(bat));
141 val->intval = (percent * bat->pdata->capacity) / 100;
142 break;
143 }
144 case POWER_SUPPLY_PROP_CAPACITY:
145 val->intval = twl4030_madc_bat_voltscale(bat,
146 twl4030_madc_bat_get_voltage(bat));
147 break;
148 case POWER_SUPPLY_PROP_CHARGE_FULL:
149 val->intval = bat->pdata->capacity;
150 break;
151 case POWER_SUPPLY_PROP_TEMP:
152 val->intval = twl4030_madc_bat_get_temp(bat);
153 break;
154 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {
155 int percent = twl4030_madc_bat_voltscale(bat,
156 twl4030_madc_bat_get_voltage(bat));
157
158 int chg = (percent * (bat->pdata->capacity/1000))/100;
159
160
161 val->intval = (3600l * chg) / 400;
162 break;
163 }
164 default:
165 return -EINVAL;
166 }
167
168 return 0;
169}
170
171static void twl4030_madc_bat_ext_changed(struct power_supply *psy)
172{
173 power_supply_changed(psy);
174}
175
176static const struct power_supply_desc twl4030_madc_bat_desc = {
177 .name = "twl4030_battery",
178 .type = POWER_SUPPLY_TYPE_BATTERY,
179 .properties = twl4030_madc_bat_props,
180 .num_properties = ARRAY_SIZE(twl4030_madc_bat_props),
181 .get_property = twl4030_madc_bat_get_property,
182 .external_power_changed = twl4030_madc_bat_ext_changed,
183
184};
185
186static int twl4030_cmp(const void *a, const void *b)
187{
188 return ((struct twl4030_madc_bat_calibration *)b)->voltage -
189 ((struct twl4030_madc_bat_calibration *)a)->voltage;
190}
191
192static int twl4030_madc_battery_probe(struct platform_device *pdev)
193{
194 struct twl4030_madc_battery *twl4030_madc_bat;
195 struct twl4030_madc_bat_platform_data *pdata = pdev->dev.platform_data;
196 struct power_supply_config psy_cfg = {};
197 int ret = 0;
198
199 twl4030_madc_bat = devm_kzalloc(&pdev->dev, sizeof(*twl4030_madc_bat),
200 GFP_KERNEL);
201 if (!twl4030_madc_bat)
202 return -ENOMEM;
203
204 twl4030_madc_bat->channel_temp = iio_channel_get(&pdev->dev, "temp");
205 if (IS_ERR(twl4030_madc_bat->channel_temp)) {
206 ret = PTR_ERR(twl4030_madc_bat->channel_temp);
207 goto err;
208 }
209
210 twl4030_madc_bat->channel_ichg = iio_channel_get(&pdev->dev, "ichg");
211 if (IS_ERR(twl4030_madc_bat->channel_ichg)) {
212 ret = PTR_ERR(twl4030_madc_bat->channel_ichg);
213 goto err_temp;
214 }
215
216 twl4030_madc_bat->channel_vbat = iio_channel_get(&pdev->dev, "vbat");
217 if (IS_ERR(twl4030_madc_bat->channel_vbat)) {
218 ret = PTR_ERR(twl4030_madc_bat->channel_vbat);
219 goto err_ichg;
220 }
221
222
223 sort(pdata->charging, pdata->charging_size,
224 sizeof(struct twl4030_madc_bat_calibration),
225 twl4030_cmp, NULL);
226 sort(pdata->discharging, pdata->discharging_size,
227 sizeof(struct twl4030_madc_bat_calibration),
228 twl4030_cmp, NULL);
229
230 twl4030_madc_bat->pdata = pdata;
231 platform_set_drvdata(pdev, twl4030_madc_bat);
232 psy_cfg.drv_data = twl4030_madc_bat;
233 twl4030_madc_bat->psy = power_supply_register(&pdev->dev,
234 &twl4030_madc_bat_desc,
235 &psy_cfg);
236 if (IS_ERR(twl4030_madc_bat->psy)) {
237 ret = PTR_ERR(twl4030_madc_bat->psy);
238 goto err_vbat;
239 }
240
241 return 0;
242
243err_vbat:
244 iio_channel_release(twl4030_madc_bat->channel_vbat);
245err_ichg:
246 iio_channel_release(twl4030_madc_bat->channel_ichg);
247err_temp:
248 iio_channel_release(twl4030_madc_bat->channel_temp);
249err:
250 return ret;
251}
252
253static int twl4030_madc_battery_remove(struct platform_device *pdev)
254{
255 struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);
256
257 power_supply_unregister(bat->psy);
258
259 iio_channel_release(bat->channel_vbat);
260 iio_channel_release(bat->channel_ichg);
261 iio_channel_release(bat->channel_temp);
262
263 return 0;
264}
265
266static struct platform_driver twl4030_madc_battery_driver = {
267 .driver = {
268 .name = "twl4030_madc_battery",
269 },
270 .probe = twl4030_madc_battery_probe,
271 .remove = twl4030_madc_battery_remove,
272};
273module_platform_driver(twl4030_madc_battery_driver);
274
275MODULE_LICENSE("GPL");
276MODULE_AUTHOR("Lukas Märdian <lukas@goldelico.com>");
277MODULE_DESCRIPTION("twl4030_madc battery driver");
278MODULE_ALIAS("platform:twl4030_madc_battery");
279
