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1// SPDX-License-Identifier: GPL-2.0-only2/*3 *4 * h3xxx atmel micro companion support, battery subdevice5 * based on previous kernel 2.4 version6 * Author : Alessandro Gardich <gremlin@gremlin.it>7 * Author : Linus Walleij <linus.walleij@linaro.org>8 */9 10#include <linux/module.h>11#include <linux/init.h>12#include <linux/platform_device.h>13#include <linux/mfd/ipaq-micro.h>14#include <linux/power_supply.h>15#include <linux/workqueue.h>16 17#define BATT_PERIOD 100000 /* 100 seconds in milliseconds */18 19#define MICRO_BATT_CHEM_ALKALINE 0x0120#define MICRO_BATT_CHEM_NICD 0x0221#define MICRO_BATT_CHEM_NIMH 0x0322#define MICRO_BATT_CHEM_LION 0x0423#define MICRO_BATT_CHEM_LIPOLY 0x0524#define MICRO_BATT_CHEM_NOT_INSTALLED 0x0625#define MICRO_BATT_CHEM_UNKNOWN 0xff26 27#define MICRO_BATT_STATUS_HIGH 0x0128#define MICRO_BATT_STATUS_LOW 0x0229#define MICRO_BATT_STATUS_CRITICAL 0x0430#define MICRO_BATT_STATUS_CHARGING 0x0831#define MICRO_BATT_STATUS_CHARGEMAIN 0x1032#define MICRO_BATT_STATUS_DEAD 0x20 /* Battery will not charge */33#define MICRO_BATT_STATUS_NOTINSTALLED 0x20 /* For expansion pack batteries */34#define MICRO_BATT_STATUS_FULL 0x40 /* Battery fully charged */35#define MICRO_BATT_STATUS_NOBATTERY 0x8036#define MICRO_BATT_STATUS_UNKNOWN 0xff37 38struct micro_battery {39 struct ipaq_micro *micro;40 struct workqueue_struct *wq;41 struct delayed_work update;42 u8 ac;43 u8 chemistry;44 unsigned int voltage;45 u16 temperature;46 u8 flag;47};48 49static void micro_battery_work(struct work_struct *work)50{51 struct micro_battery *mb = container_of(work,52 struct micro_battery, update.work);53 struct ipaq_micro_msg msg_battery = {54 .id = MSG_BATTERY,55 };56 struct ipaq_micro_msg msg_sensor = {57 .id = MSG_THERMAL_SENSOR,58 };59 60 /* First send battery message */61 ipaq_micro_tx_msg_sync(mb->micro, &msg_battery);62 if (msg_battery.rx_len < 4)63 pr_info("ERROR");64 65 /*66 * Returned message format:67 * byte 0: 0x00 = Not plugged in68 * 0x01 = AC adapter plugged in69 * byte 1: chemistry70 * byte 2: voltage LSB71 * byte 3: voltage MSB72 * byte 4: flags73 * byte 5-9: same for battery 274 */75 mb->ac = msg_battery.rx_data[0];76 mb->chemistry = msg_battery.rx_data[1];77 mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) +78 msg_battery.rx_data[2]) * 5000L) * 1000 / 1024;79 mb->flag = msg_battery.rx_data[4];80 81 if (msg_battery.rx_len == 9)82 pr_debug("second battery ignored\n");83 84 /* Then read the sensor */85 ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor);86 mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0];87 88 queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));89}90 91static int get_capacity(struct power_supply *b)92{93 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);94 95 switch (mb->flag & 0x07) {96 case MICRO_BATT_STATUS_HIGH:97 return 100;98 break;99 case MICRO_BATT_STATUS_LOW:100 return 50;101 break;102 case MICRO_BATT_STATUS_CRITICAL:103 return 5;104 break;105 default:106 break;107 }108 return 0;109}110 111static int get_status(struct power_supply *b)112{113 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);114 115 if (mb->flag == MICRO_BATT_STATUS_UNKNOWN)116 return POWER_SUPPLY_STATUS_UNKNOWN;117 118 if (mb->flag & MICRO_BATT_STATUS_FULL)119 return POWER_SUPPLY_STATUS_FULL;120 121 if ((mb->flag & MICRO_BATT_STATUS_CHARGING) ||122 (mb->flag & MICRO_BATT_STATUS_CHARGEMAIN))123 return POWER_SUPPLY_STATUS_CHARGING;124 125 return POWER_SUPPLY_STATUS_DISCHARGING;126}127 128static int micro_batt_get_property(struct power_supply *b,129 enum power_supply_property psp,130 union power_supply_propval *val)131{132 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);133 134 switch (psp) {135 case POWER_SUPPLY_PROP_TECHNOLOGY:136 switch (mb->chemistry) {137 case MICRO_BATT_CHEM_NICD:138 val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd;139 break;140 case MICRO_BATT_CHEM_NIMH:141 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;142 break;143 case MICRO_BATT_CHEM_LION:144 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;145 break;146 case MICRO_BATT_CHEM_LIPOLY:147 val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO;148 break;149 default:150 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;151 break;152 }153 break;154 case POWER_SUPPLY_PROP_STATUS:155 val->intval = get_status(b);156 break;157 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:158 val->intval = 4700000;159 break;160 case POWER_SUPPLY_PROP_CAPACITY:161 val->intval = get_capacity(b);162 break;163 case POWER_SUPPLY_PROP_TEMP:164 val->intval = mb->temperature;165 break;166 case POWER_SUPPLY_PROP_VOLTAGE_NOW:167 val->intval = mb->voltage;168 break;169 default:170 return -EINVAL;171 }172 173 return 0;174}175 176static int micro_ac_get_property(struct power_supply *b,177 enum power_supply_property psp,178 union power_supply_propval *val)179{180 struct micro_battery *mb = dev_get_drvdata(b->dev.parent);181 182 switch (psp) {183 case POWER_SUPPLY_PROP_ONLINE:184 val->intval = mb->ac;185 break;186 default:187 return -EINVAL;188 }189 190 return 0;191}192 193static enum power_supply_property micro_batt_power_props[] = {194 POWER_SUPPLY_PROP_TECHNOLOGY,195 POWER_SUPPLY_PROP_STATUS,196 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,197 POWER_SUPPLY_PROP_CAPACITY,198 POWER_SUPPLY_PROP_TEMP,199 POWER_SUPPLY_PROP_VOLTAGE_NOW,200};201 202static const struct power_supply_desc micro_batt_power_desc = {203 .name = "main-battery",204 .type = POWER_SUPPLY_TYPE_BATTERY,205 .properties = micro_batt_power_props,206 .num_properties = ARRAY_SIZE(micro_batt_power_props),207 .get_property = micro_batt_get_property,208 .use_for_apm = 1,209};210 211static enum power_supply_property micro_ac_power_props[] = {212 POWER_SUPPLY_PROP_ONLINE,213};214 215static const struct power_supply_desc micro_ac_power_desc = {216 .name = "ac",217 .type = POWER_SUPPLY_TYPE_MAINS,218 .properties = micro_ac_power_props,219 .num_properties = ARRAY_SIZE(micro_ac_power_props),220 .get_property = micro_ac_get_property,221};222 223static struct power_supply *micro_batt_power, *micro_ac_power;224 225static int micro_batt_probe(struct platform_device *pdev)226{227 struct micro_battery *mb;228 int ret;229 230 mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL);231 if (!mb)232 return -ENOMEM;233 234 mb->micro = dev_get_drvdata(pdev->dev.parent);235 mb->wq = alloc_workqueue("ipaq-battery-wq", WQ_MEM_RECLAIM, 0);236 if (!mb->wq)237 return -ENOMEM;238 239 INIT_DELAYED_WORK(&mb->update, micro_battery_work);240 platform_set_drvdata(pdev, mb);241 queue_delayed_work(mb->wq, &mb->update, 1);242 243 micro_batt_power = power_supply_register(&pdev->dev,244 µ_batt_power_desc, NULL);245 if (IS_ERR(micro_batt_power)) {246 ret = PTR_ERR(micro_batt_power);247 goto batt_err;248 }249 250 micro_ac_power = power_supply_register(&pdev->dev,251 µ_ac_power_desc, NULL);252 if (IS_ERR(micro_ac_power)) {253 ret = PTR_ERR(micro_ac_power);254 goto ac_err;255 }256 257 dev_info(&pdev->dev, "iPAQ micro battery driver\n");258 return 0;259 260ac_err:261 power_supply_unregister(micro_batt_power);262batt_err:263 cancel_delayed_work_sync(&mb->update);264 destroy_workqueue(mb->wq);265 return ret;266}267 268static void micro_batt_remove(struct platform_device *pdev)269 270{271 struct micro_battery *mb = platform_get_drvdata(pdev);272 273 power_supply_unregister(micro_ac_power);274 power_supply_unregister(micro_batt_power);275 cancel_delayed_work_sync(&mb->update);276 destroy_workqueue(mb->wq);277}278 279static int __maybe_unused micro_batt_suspend(struct device *dev)280{281 struct micro_battery *mb = dev_get_drvdata(dev);282 283 cancel_delayed_work_sync(&mb->update);284 return 0;285}286 287static int __maybe_unused micro_batt_resume(struct device *dev)288{289 struct micro_battery *mb = dev_get_drvdata(dev);290 291 queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD));292 return 0;293}294 295static const struct dev_pm_ops micro_batt_dev_pm_ops = {296 SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume)297};298 299static struct platform_driver micro_batt_device_driver = {300 .driver = {301 .name = "ipaq-micro-battery",302 .pm = µ_batt_dev_pm_ops,303 },304 .probe = micro_batt_probe,305 .remove_new = micro_batt_remove,306};307module_platform_driver(micro_batt_device_driver);308 309MODULE_LICENSE("GPL");310MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery");311MODULE_ALIAS("platform:ipaq-micro-battery");312