1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * h3xxx atmel micro companion support, battery subdevice 5 * based on previous kernel 2.4 version 6 * 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 0x01 20 #define MICRO_BATT_CHEM_NICD 0x02 21 #define MICRO_BATT_CHEM_NIMH 0x03 22 #define MICRO_BATT_CHEM_LION 0x04 23 #define MICRO_BATT_CHEM_LIPOLY 0x05 24 #define MICRO_BATT_CHEM_NOT_INSTALLED 0x06 25 #define MICRO_BATT_CHEM_UNKNOWN 0xff 26 27 #define MICRO_BATT_STATUS_HIGH 0x01 28 #define MICRO_BATT_STATUS_LOW 0x02 29 #define MICRO_BATT_STATUS_CRITICAL 0x04 30 #define MICRO_BATT_STATUS_CHARGING 0x08 31 #define MICRO_BATT_STATUS_CHARGEMAIN 0x10 32 #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 0x80 36 #define MICRO_BATT_STATUS_UNKNOWN 0xff 37 38 struct 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 49 static 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 in 68 * 0x01 = AC adapter plugged in 69 * byte 1: chemistry 70 * byte 2: voltage LSB 71 * byte 3: voltage MSB 72 * byte 4: flags 73 * byte 5-9: same for battery 2 74 */ 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 91 static 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 } 110 111 static 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 } 127 128 static 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 } 175 176 static 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 } 192 193 static 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 }; 201 202 static 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 }; 210 211 static enum power_supply_property micro_ac_power_props[] = { 212 POWER_SUPPLY_PROP_ONLINE, 213 }; 214 215 static 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 }; 222 223 static struct power_supply *micro_batt_power, *micro_ac_power; 224 225 static 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; 259 260 ac_err: 261 power_supply_unregister(micro_batt_power); 262 batt_err: 263 cancel_delayed_work_sync(&mb->update); 264 destroy_workqueue(mb->wq); 265 return ret; 266 } 267 268 static int 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 return 0; 279 } 280 281 static int __maybe_unused micro_batt_suspend(struct device *dev) 282 { 283 struct micro_battery *mb = dev_get_drvdata(dev); 284 285 cancel_delayed_work_sync(&mb->update); 286 return 0; 287 } 288 289 static int __maybe_unused micro_batt_resume(struct device *dev) 290 { 291 struct micro_battery *mb = dev_get_drvdata(dev); 292 293 queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD)); 294 return 0; 295 } 296 297 static const struct dev_pm_ops micro_batt_dev_pm_ops = { 298 SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume) 299 }; 300 301 static struct platform_driver micro_batt_device_driver = { 302 .driver = { 303 .name = "ipaq-micro-battery", 304 .pm = µ_batt_dev_pm_ops, 305 }, 306 .probe = micro_batt_probe, 307 .remove = micro_batt_remove, 308 }; 309 module_platform_driver(micro_batt_device_driver); 310 311 MODULE_LICENSE("GPL"); 312 MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery"); 313 MODULE_ALIAS("platform:ipaq-micro-battery"); 314