arm64: dts: qcom: sm8550: add TRNG node
[linux-modified.git] / drivers / power / supply / generic-adc-battery.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Generic battery driver using IIO
4  * Copyright (C) 2012, Anish Kumar <anish198519851985@gmail.com>
5  * Copyright (c) 2023, Sebastian Reichel <sre@kernel.org>
6  */
7 #include <linux/interrupt.h>
8 #include <linux/platform_device.h>
9 #include <linux/power_supply.h>
10 #include <linux/gpio/consumer.h>
11 #include <linux/err.h>
12 #include <linux/timer.h>
13 #include <linux/jiffies.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/iio/consumer.h>
19 #include <linux/iio/types.h>
20 #include <linux/of.h>
21 #include <linux/devm-helpers.h>
22
23 #define JITTER_DEFAULT 10 /* hope 10ms is enough */
24
25 enum gab_chan_type {
26         GAB_VOLTAGE = 0,
27         GAB_CURRENT,
28         GAB_POWER,
29         GAB_TEMP,
30         GAB_MAX_CHAN_TYPE
31 };
32
33 /*
34  * gab_chan_name suggests the standard channel names for commonly used
35  * channel types.
36  */
37 static const char *const gab_chan_name[] = {
38         [GAB_VOLTAGE]   = "voltage",
39         [GAB_CURRENT]   = "current",
40         [GAB_POWER]     = "power",
41         [GAB_TEMP]      = "temperature",
42 };
43
44 struct gab {
45         struct power_supply *psy;
46         struct power_supply_desc psy_desc;
47         struct iio_channel *channel[GAB_MAX_CHAN_TYPE];
48         struct delayed_work bat_work;
49         int status;
50         struct gpio_desc *charge_finished;
51 };
52
53 static struct gab *to_generic_bat(struct power_supply *psy)
54 {
55         return power_supply_get_drvdata(psy);
56 }
57
58 static void gab_ext_power_changed(struct power_supply *psy)
59 {
60         struct gab *adc_bat = to_generic_bat(psy);
61
62         schedule_delayed_work(&adc_bat->bat_work, msecs_to_jiffies(0));
63 }
64
65 static const enum power_supply_property gab_props[] = {
66         POWER_SUPPLY_PROP_STATUS,
67 };
68
69 /*
70  * This properties are set based on the received platform data and this
71  * should correspond one-to-one with enum chan_type.
72  */
73 static const enum power_supply_property gab_dyn_props[] = {
74         POWER_SUPPLY_PROP_VOLTAGE_NOW,
75         POWER_SUPPLY_PROP_CURRENT_NOW,
76         POWER_SUPPLY_PROP_POWER_NOW,
77         POWER_SUPPLY_PROP_TEMP,
78 };
79
80 static bool gab_charge_finished(struct gab *adc_bat)
81 {
82         if (!adc_bat->charge_finished)
83                 return false;
84         return gpiod_get_value(adc_bat->charge_finished);
85 }
86
87 static int gab_read_channel(struct gab *adc_bat, enum gab_chan_type channel,
88                 int *result)
89 {
90         int ret;
91
92         ret = iio_read_channel_processed(adc_bat->channel[channel], result);
93         if (ret < 0)
94                 dev_err(&adc_bat->psy->dev, "read channel error: %d\n", ret);
95         else
96                 *result *= 1000;
97
98         return ret;
99 }
100
101 static int gab_get_property(struct power_supply *psy,
102                 enum power_supply_property psp, union power_supply_propval *val)
103 {
104         struct gab *adc_bat = to_generic_bat(psy);
105
106         switch (psp) {
107         case POWER_SUPPLY_PROP_STATUS:
108                 val->intval = adc_bat->status;
109                 return 0;
110         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
111                 return gab_read_channel(adc_bat, GAB_VOLTAGE, &val->intval);
112         case POWER_SUPPLY_PROP_CURRENT_NOW:
113                 return gab_read_channel(adc_bat, GAB_CURRENT, &val->intval);
114         case POWER_SUPPLY_PROP_POWER_NOW:
115                 return gab_read_channel(adc_bat, GAB_POWER, &val->intval);
116         case POWER_SUPPLY_PROP_TEMP:
117                 return gab_read_channel(adc_bat, GAB_TEMP, &val->intval);
118         default:
119                 return -EINVAL;
120         }
121 }
122
123 static void gab_work(struct work_struct *work)
124 {
125         struct gab *adc_bat;
126         struct delayed_work *delayed_work;
127         int status;
128
129         delayed_work = to_delayed_work(work);
130         adc_bat = container_of(delayed_work, struct gab, bat_work);
131         status = adc_bat->status;
132
133         if (!power_supply_am_i_supplied(adc_bat->psy))
134                 adc_bat->status =  POWER_SUPPLY_STATUS_DISCHARGING;
135         else if (gab_charge_finished(adc_bat))
136                 adc_bat->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
137         else
138                 adc_bat->status = POWER_SUPPLY_STATUS_CHARGING;
139
140         if (status != adc_bat->status)
141                 power_supply_changed(adc_bat->psy);
142 }
143
144 static irqreturn_t gab_charged(int irq, void *dev_id)
145 {
146         struct gab *adc_bat = dev_id;
147
148         schedule_delayed_work(&adc_bat->bat_work,
149                               msecs_to_jiffies(JITTER_DEFAULT));
150
151         return IRQ_HANDLED;
152 }
153
154 static int gab_probe(struct platform_device *pdev)
155 {
156         struct gab *adc_bat;
157         struct power_supply_desc *psy_desc;
158         struct power_supply_config psy_cfg = {};
159         enum power_supply_property *properties;
160         int ret = 0;
161         int chan;
162         int index = ARRAY_SIZE(gab_props);
163         bool any = false;
164
165         adc_bat = devm_kzalloc(&pdev->dev, sizeof(*adc_bat), GFP_KERNEL);
166         if (!adc_bat)
167                 return -ENOMEM;
168
169         psy_cfg.of_node = pdev->dev.of_node;
170         psy_cfg.drv_data = adc_bat;
171         psy_desc = &adc_bat->psy_desc;
172         psy_desc->name = dev_name(&pdev->dev);
173
174         /* bootup default values for the battery */
175         adc_bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
176         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
177         psy_desc->get_property = gab_get_property;
178         psy_desc->external_power_changed = gab_ext_power_changed;
179
180         /*
181          * copying the static properties and allocating extra memory for holding
182          * the extra configurable properties received from platform data.
183          */
184         properties = devm_kcalloc(&pdev->dev,
185                                   ARRAY_SIZE(gab_props) +
186                                   ARRAY_SIZE(gab_chan_name),
187                                   sizeof(*properties),
188                                   GFP_KERNEL);
189         if (!properties)
190                 return -ENOMEM;
191
192         memcpy(properties, gab_props, sizeof(gab_props));
193
194         /*
195          * getting channel from iio and copying the battery properties
196          * based on the channel supported by consumer device.
197          */
198         for (chan = 0; chan < ARRAY_SIZE(gab_chan_name); chan++) {
199                 adc_bat->channel[chan] = devm_iio_channel_get(&pdev->dev, gab_chan_name[chan]);
200                 if (IS_ERR(adc_bat->channel[chan])) {
201                         ret = PTR_ERR(adc_bat->channel[chan]);
202                         if (ret != -ENODEV)
203                                 return dev_err_probe(&pdev->dev, ret, "Failed to get ADC channel %s\n", gab_chan_name[chan]);
204                         adc_bat->channel[chan] = NULL;
205                 } else if (adc_bat->channel[chan]) {
206                         /* copying properties for supported channels only */
207                         int index2;
208
209                         for (index2 = 0; index2 < index; index2++) {
210                                 if (properties[index2] == gab_dyn_props[chan])
211                                         break;  /* already known */
212                         }
213                         if (index2 == index)    /* really new */
214                                 properties[index++] = gab_dyn_props[chan];
215                         any = true;
216                 }
217         }
218
219         /* none of the channels are supported so let's bail out */
220         if (!any)
221                 return dev_err_probe(&pdev->dev, -ENODEV, "Failed to get any ADC channel\n");
222
223         /*
224          * Total number of properties is equal to static properties
225          * plus the dynamic properties.Some properties may not be set
226          * as come channels may be not be supported by the device.So
227          * we need to take care of that.
228          */
229         psy_desc->properties = properties;
230         psy_desc->num_properties = index;
231
232         adc_bat->psy = devm_power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
233         if (IS_ERR(adc_bat->psy))
234                 return dev_err_probe(&pdev->dev, PTR_ERR(adc_bat->psy), "Failed to register power-supply device\n");
235
236         ret = devm_delayed_work_autocancel(&pdev->dev, &adc_bat->bat_work, gab_work);
237         if (ret)
238                 return dev_err_probe(&pdev->dev, ret, "Failed to register delayed work\n");
239
240         adc_bat->charge_finished = devm_gpiod_get_optional(&pdev->dev, "charged", GPIOD_IN);
241         if (adc_bat->charge_finished) {
242                 int irq;
243
244                 irq = gpiod_to_irq(adc_bat->charge_finished);
245                 ret = devm_request_any_context_irq(&pdev->dev, irq, gab_charged,
246                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
247                                 "battery charged", adc_bat);
248                 if (ret < 0)
249                         return dev_err_probe(&pdev->dev, ret, "Failed to register irq\n");
250         }
251
252         platform_set_drvdata(pdev, adc_bat);
253
254         /* Schedule timer to check current status */
255         schedule_delayed_work(&adc_bat->bat_work,
256                         msecs_to_jiffies(0));
257         return 0;
258 }
259
260 static int __maybe_unused gab_suspend(struct device *dev)
261 {
262         struct gab *adc_bat = dev_get_drvdata(dev);
263
264         cancel_delayed_work_sync(&adc_bat->bat_work);
265         adc_bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
266         return 0;
267 }
268
269 static int __maybe_unused gab_resume(struct device *dev)
270 {
271         struct gab *adc_bat = dev_get_drvdata(dev);
272
273         /* Schedule timer to check current status */
274         schedule_delayed_work(&adc_bat->bat_work,
275                               msecs_to_jiffies(JITTER_DEFAULT));
276
277         return 0;
278 }
279
280 static SIMPLE_DEV_PM_OPS(gab_pm_ops, gab_suspend, gab_resume);
281
282 static const struct of_device_id gab_match[] = {
283         { .compatible = "adc-battery" },
284         { }
285 };
286 MODULE_DEVICE_TABLE(of, gab_match);
287
288 static struct platform_driver gab_driver = {
289         .driver         = {
290                 .name   = "generic-adc-battery",
291                 .pm     = &gab_pm_ops,
292                 .of_match_table = gab_match,
293         },
294         .probe          = gab_probe,
295 };
296 module_platform_driver(gab_driver);
297
298 MODULE_AUTHOR("anish kumar <anish198519851985@gmail.com>");
299 MODULE_DESCRIPTION("generic battery driver using IIO");
300 MODULE_LICENSE("GPL");