power/supply/ipaq_micro_battery.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *
0004  * h3xxx atmel micro companion support, battery subdevice
0005  * based on previous kernel 2.4 version
0006  * Author : Alessandro Gardich <gremlin@gremlin.it>
0007  * Author : Linus Walleij <linus.walleij@linaro.org>
0008  */
0009
0010 #include <linux/module.h>
0011 #include <linux/init.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/mfd/ipaq-micro.h>
0014 #include <linux/power_supply.h>
0015 #include <linux/workqueue.h>
0016
0017 #define BATT_PERIOD 100000 /* 100 seconds in milliseconds */
0018
0019 #define MICRO_BATT_CHEM_ALKALINE    0x01
0020 #define MICRO_BATT_CHEM_NICD        0x02
0021 #define MICRO_BATT_CHEM_NIMH        0x03
0022 #define MICRO_BATT_CHEM_LION        0x04
0023 #define MICRO_BATT_CHEM_LIPOLY      0x05
0024 #define MICRO_BATT_CHEM_NOT_INSTALLED   0x06
0025 #define MICRO_BATT_CHEM_UNKNOWN     0xff
0026
0027 #define MICRO_BATT_STATUS_HIGH      0x01
0028 #define MICRO_BATT_STATUS_LOW       0x02
0029 #define MICRO_BATT_STATUS_CRITICAL  0x04
0030 #define MICRO_BATT_STATUS_CHARGING  0x08
0031 #define MICRO_BATT_STATUS_CHARGEMAIN    0x10
0032 #define MICRO_BATT_STATUS_DEAD      0x20 /* Battery will not charge */
0033 #define MICRO_BATT_STATUS_NOTINSTALLED  0x20 /* For expansion pack batteries */
0034 #define MICRO_BATT_STATUS_FULL      0x40 /* Battery fully charged */
0035 #define MICRO_BATT_STATUS_NOBATTERY 0x80
0036 #define MICRO_BATT_STATUS_UNKNOWN   0xff
0037
0038 struct micro_battery {
0039     struct ipaq_micro *micro;
0040     struct workqueue_struct *wq;
0041     struct delayed_work update;
0042     u8 ac;
0043     u8 chemistry;
0044     unsigned int voltage;
0045     u16 temperature;
0046     u8 flag;
0047 };
0048
0049 static void micro_battery_work(struct work_struct *work)
0050 {
0051     struct micro_battery *mb = container_of(work,
0052                 struct micro_battery, update.work);
0053     struct ipaq_micro_msg msg_battery = {
0054         .id = MSG_BATTERY,
0055     };
0056     struct ipaq_micro_msg msg_sensor = {
0057         .id = MSG_THERMAL_SENSOR,
0058     };
0059
0060     /* First send battery message */
0061     ipaq_micro_tx_msg_sync(mb->micro, &msg_battery);
0062     if (msg_battery.rx_len < 4)
0063         pr_info("ERROR");
0064
0065     /*
0066      * Returned message format:
0067      * byte 0:   0x00 = Not plugged in
0068      *           0x01 = AC adapter plugged in
0069      * byte 1:   chemistry
0070      * byte 2:   voltage LSB
0071      * byte 3:   voltage MSB
0072      * byte 4:   flags
0073      * byte 5-9: same for battery 2
0074      */
0075     mb->ac = msg_battery.rx_data[0];
0076     mb->chemistry = msg_battery.rx_data[1];
0077     mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) +
0078             msg_battery.rx_data[2]) * 5000L) * 1000 / 1024;
0079     mb->flag = msg_battery.rx_data[4];
0080
0081     if (msg_battery.rx_len == 9)
0082         pr_debug("second battery ignored\n");
0083
0084     /* Then read the sensor */
0085     ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor);
0086     mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0];
0087
0088     queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
0089 }
0090
0091 static int get_capacity(struct power_supply *b)
0092 {
0093     struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
0094
0095     switch (mb->flag & 0x07) {
0096     case MICRO_BATT_STATUS_HIGH:
0097         return 100;
0098         break;
0099     case MICRO_BATT_STATUS_LOW:
0100         return 50;
0101         break;
0102     case MICRO_BATT_STATUS_CRITICAL:
0103         return 5;
0104         break;
0105     default:
0106         break;
0107     }
0108     return 0;
0109 }
0110
0111 static int get_status(struct power_supply *b)
0112 {
0113     struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
0114
0115     if (mb->flag == MICRO_BATT_STATUS_UNKNOWN)
0116         return POWER_SUPPLY_STATUS_UNKNOWN;
0117
0118     if (mb->flag & MICRO_BATT_STATUS_FULL)
0119         return POWER_SUPPLY_STATUS_FULL;
0120
0121     if ((mb->flag & MICRO_BATT_STATUS_CHARGING) ||
0122         (mb->flag & MICRO_BATT_STATUS_CHARGEMAIN))
0123         return POWER_SUPPLY_STATUS_CHARGING;
0124
0125     return POWER_SUPPLY_STATUS_DISCHARGING;
0126 }
0127
0128 static int micro_batt_get_property(struct power_supply *b,
0129                     enum power_supply_property psp,
0130                     union power_supply_propval *val)
0131 {
0132     struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
0133
0134     switch (psp) {
0135     case POWER_SUPPLY_PROP_TECHNOLOGY:
0136         switch (mb->chemistry) {
0137         case MICRO_BATT_CHEM_NICD:
0138             val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;
0139             break;
0140         case MICRO_BATT_CHEM_NIMH:
0141             val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
0142             break;
0143         case MICRO_BATT_CHEM_LION:
0144             val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
0145             break;
0146         case MICRO_BATT_CHEM_LIPOLY:
0147             val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;
0148             break;
0149         default:
0150             val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
0151             break;
0152         }
0153         break;
0154     case POWER_SUPPLY_PROP_STATUS:
0155         val->intval = get_status(b);
0156         break;
0157     case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
0158         val->intval = 4700000;
0159         break;
0160     case POWER_SUPPLY_PROP_CAPACITY:
0161         val->intval = get_capacity(b);
0162         break;
0163     case POWER_SUPPLY_PROP_TEMP:
0164         val->intval = mb->temperature;
0165         break;
0166     case POWER_SUPPLY_PROP_VOLTAGE_NOW:
0167         val->intval = mb->voltage;
0168         break;
0169     default:
0170         return -EINVAL;
0171     }
0172
0173     return 0;
0174 }
0175
0176 static int micro_ac_get_property(struct power_supply *b,
0177                  enum power_supply_property psp,
0178                  union power_supply_propval *val)
0179 {
0180     struct micro_battery *mb = dev_get_drvdata(b->dev.parent);
0181
0182     switch (psp) {
0183     case POWER_SUPPLY_PROP_ONLINE:
0184         val->intval = mb->ac;
0185         break;
0186     default:
0187         return -EINVAL;
0188     }
0189
0190     return 0;
0191 }
0192
0193 static enum power_supply_property micro_batt_power_props[] = {
0194     POWER_SUPPLY_PROP_TECHNOLOGY,
0195     POWER_SUPPLY_PROP_STATUS,
0196     POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
0197     POWER_SUPPLY_PROP_CAPACITY,
0198     POWER_SUPPLY_PROP_TEMP,
0199     POWER_SUPPLY_PROP_VOLTAGE_NOW,
0200 };
0201
0202 static const struct power_supply_desc micro_batt_power_desc = {
0203     .name           = "main-battery",
0204     .type           = POWER_SUPPLY_TYPE_BATTERY,
0205     .properties     = micro_batt_power_props,
0206     .num_properties     = ARRAY_SIZE(micro_batt_power_props),
0207     .get_property       = micro_batt_get_property,
0208     .use_for_apm        = 1,
0209 };
0210
0211 static enum power_supply_property micro_ac_power_props[] = {
0212     POWER_SUPPLY_PROP_ONLINE,
0213 };
0214
0215 static const struct power_supply_desc micro_ac_power_desc = {
0216     .name           = "ac",
0217     .type           = POWER_SUPPLY_TYPE_MAINS,
0218     .properties     = micro_ac_power_props,
0219     .num_properties     = ARRAY_SIZE(micro_ac_power_props),
0220     .get_property       = micro_ac_get_property,
0221 };
0222
0223 static struct power_supply *micro_batt_power, *micro_ac_power;
0224
0225 static int micro_batt_probe(struct platform_device *pdev)
0226 {
0227     struct micro_battery *mb;
0228     int ret;
0229
0230     mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);
0231     if (!mb)
0232         return -ENOMEM;
0233
0234     mb->micro = dev_get_drvdata(pdev->dev.parent);
0235     mb->wq = alloc_workqueue("ipaq-battery-wq", WQ_MEM_RECLAIM, 0);
0236     if (!mb->wq)
0237         return -ENOMEM;
0238
0239     INIT_DELAYED_WORK(&mb->update, micro_battery_work);
0240     platform_set_drvdata(pdev, mb);
0241     queue_delayed_work(mb->wq, &mb->update, 1);
0242
0243     micro_batt_power = power_supply_register(&pdev->dev,
0244                          &micro_batt_power_desc, NULL);
0245     if (IS_ERR(micro_batt_power)) {
0246         ret = PTR_ERR(micro_batt_power);
0247         goto batt_err;
0248     }
0249
0250     micro_ac_power = power_supply_register(&pdev->dev,
0251                            &micro_ac_power_desc, NULL);
0252     if (IS_ERR(micro_ac_power)) {
0253         ret = PTR_ERR(micro_ac_power);
0254         goto ac_err;
0255     }
0256
0257     dev_info(&pdev->dev, "iPAQ micro battery driver\n");
0258     return 0;
0259
0260 ac_err:
0261     power_supply_unregister(micro_batt_power);
0262 batt_err:
0263     cancel_delayed_work_sync(&mb->update);
0264     destroy_workqueue(mb->wq);
0265     return ret;
0266 }
0267
0268 static int micro_batt_remove(struct platform_device *pdev)
0269
0270 {
0271     struct micro_battery *mb = platform_get_drvdata(pdev);
0272
0273     power_supply_unregister(micro_ac_power);
0274     power_supply_unregister(micro_batt_power);
0275     cancel_delayed_work_sync(&mb->update);
0276     destroy_workqueue(mb->wq);
0277
0278     return 0;
0279 }
0280
0281 static int __maybe_unused micro_batt_suspend(struct device *dev)
0282 {
0283     struct micro_battery *mb = dev_get_drvdata(dev);
0284
0285     cancel_delayed_work_sync(&mb->update);
0286     return 0;
0287 }
0288
0289 static int __maybe_unused micro_batt_resume(struct device *dev)
0290 {
0291     struct micro_battery *mb = dev_get_drvdata(dev);
0292
0293     queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));
0294     return 0;
0295 }
0296
0297 static const struct dev_pm_ops micro_batt_dev_pm_ops = {
0298     SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)
0299 };
0300
0301 static struct platform_driver micro_batt_device_driver = {
0302     .driver     = {
0303         .name   = "ipaq-micro-battery",
0304         .pm = &micro_batt_dev_pm_ops,
0305     },
0306     .probe      = micro_batt_probe,
0307     .remove     = micro_batt_remove,
0308 };
0309 module_platform_driver(micro_batt_device_driver);
0310
0311 MODULE_LICENSE("GPL");
0312 MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");
0313 MODULE_ALIAS("platform:ipaq-micro-battery");