1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2 as 4 * published by the Free Software Foundation. 5 * 6 * h3xxx atmel micro companion support, battery subdevice 7 * based on previous kernel 2.4 version 8 * Author : Alessandro Gardich <gremlin@gremlin.it> 9 * Author : Linus Walleij <linus.walleij@linaro.org> 10 * 11 */ 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/platform_device.h> 16 #include <linux/mfd/ipaq-micro.h> 17 #include <linux/power_supply.h> 18 #include <linux/workqueue.h> 19 20 #define BATT_PERIOD 100000 /* 100 seconds in milliseconds */ 21 22 #define MICRO_BATT_CHEM_ALKALINE 0x01 23 #define MICRO_BATT_CHEM_NICD 0x02 24 #define MICRO_BATT_CHEM_NIMH 0x03 25 #define MICRO_BATT_CHEM_LION 0x04 26 #define MICRO_BATT_CHEM_LIPOLY 0x05 27 #define MICRO_BATT_CHEM_NOT_INSTALLED 0x06 28 #define MICRO_BATT_CHEM_UNKNOWN 0xff 29 30 #define MICRO_BATT_STATUS_HIGH 0x01 31 #define MICRO_BATT_STATUS_LOW 0x02 32 #define MICRO_BATT_STATUS_CRITICAL 0x04 33 #define MICRO_BATT_STATUS_CHARGING 0x08 34 #define MICRO_BATT_STATUS_CHARGEMAIN 0x10 35 #define MICRO_BATT_STATUS_DEAD 0x20 /* Battery will not charge */ 36 #define MICRO_BATT_STATUS_NOTINSTALLED 0x20 /* For expansion pack batteries */ 37 #define MICRO_BATT_STATUS_FULL 0x40 /* Battery fully charged */ 38 #define MICRO_BATT_STATUS_NOBATTERY 0x80 39 #define MICRO_BATT_STATUS_UNKNOWN 0xff 40 41 struct micro_battery { 42 struct ipaq_micro *micro; 43 struct workqueue_struct *wq; 44 struct delayed_work update; 45 u8 ac; 46 u8 chemistry; 47 unsigned int voltage; 48 u16 temperature; 49 u8 flag; 50 }; 51 52 static void micro_battery_work(struct work_struct *work) 53 { 54 struct micro_battery *mb = container_of(work, 55 struct micro_battery, update.work); 56 struct ipaq_micro_msg msg_battery = { 57 .id = MSG_BATTERY, 58 }; 59 struct ipaq_micro_msg msg_sensor = { 60 .id = MSG_THERMAL_SENSOR, 61 }; 62 63 /* First send battery message */ 64 ipaq_micro_tx_msg_sync(mb->micro, &msg_battery); 65 if (msg_battery.rx_len < 4) 66 pr_info("ERROR"); 67 68 /* 69 * Returned message format: 70 * byte 0: 0x00 = Not plugged in 71 * 0x01 = AC adapter plugged in 72 * byte 1: chemistry 73 * byte 2: voltage LSB 74 * byte 3: voltage MSB 75 * byte 4: flags 76 * byte 5-9: same for battery 2 77 */ 78 mb->ac = msg_battery.rx_data[0]; 79 mb->chemistry = msg_battery.rx_data[1]; 80 mb->voltage = ((((unsigned short)msg_battery.rx_data[3] << 8) + 81 msg_battery.rx_data[2]) * 5000L) * 1000 / 1024; 82 mb->flag = msg_battery.rx_data[4]; 83 84 if (msg_battery.rx_len == 9) 85 pr_debug("second battery ignored\n"); 86 87 /* Then read the sensor */ 88 ipaq_micro_tx_msg_sync(mb->micro, &msg_sensor); 89 mb->temperature = msg_sensor.rx_data[1] << 8 | msg_sensor.rx_data[0]; 90 91 queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD)); 92 } 93 94 static int get_capacity(struct power_supply *b) 95 { 96 struct micro_battery *mb = dev_get_drvdata(b->dev.parent); 97 98 switch (mb->flag & 0x07) { 99 case MICRO_BATT_STATUS_HIGH: 100 return 100; 101 break; 102 case MICRO_BATT_STATUS_LOW: 103 return 50; 104 break; 105 case MICRO_BATT_STATUS_CRITICAL: 106 return 5; 107 break; 108 default: 109 break; 110 } 111 return 0; 112 } 113 114 static int get_status(struct power_supply *b) 115 { 116 struct micro_battery *mb = dev_get_drvdata(b->dev.parent); 117 118 if (mb->flag == MICRO_BATT_STATUS_UNKNOWN) 119 return POWER_SUPPLY_STATUS_UNKNOWN; 120 121 if (mb->flag & MICRO_BATT_STATUS_FULL) 122 return POWER_SUPPLY_STATUS_FULL; 123 124 if ((mb->flag & MICRO_BATT_STATUS_CHARGING) || 125 (mb->flag & MICRO_BATT_STATUS_CHARGEMAIN)) 126 return POWER_SUPPLY_STATUS_CHARGING; 127 128 return POWER_SUPPLY_STATUS_DISCHARGING; 129 } 130 131 static int micro_batt_get_property(struct power_supply *b, 132 enum power_supply_property psp, 133 union power_supply_propval *val) 134 { 135 struct micro_battery *mb = dev_get_drvdata(b->dev.parent); 136 137 switch (psp) { 138 case POWER_SUPPLY_PROP_TECHNOLOGY: 139 switch (mb->chemistry) { 140 case MICRO_BATT_CHEM_NICD: 141 val->intval = POWER_SUPPLY_TECHNOLOGY_NiCd; 142 break; 143 case MICRO_BATT_CHEM_NIMH: 144 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; 145 break; 146 case MICRO_BATT_CHEM_LION: 147 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 148 break; 149 case MICRO_BATT_CHEM_LIPOLY: 150 val->intval = POWER_SUPPLY_TECHNOLOGY_LIPO; 151 break; 152 default: 153 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 154 break; 155 }; 156 break; 157 case POWER_SUPPLY_PROP_STATUS: 158 val->intval = get_status(b); 159 break; 160 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 161 val->intval = 4700000; 162 break; 163 case POWER_SUPPLY_PROP_CAPACITY: 164 val->intval = get_capacity(b); 165 break; 166 case POWER_SUPPLY_PROP_TEMP: 167 val->intval = mb->temperature; 168 break; 169 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 170 val->intval = mb->voltage; 171 break; 172 default: 173 return -EINVAL; 174 }; 175 176 return 0; 177 } 178 179 static int micro_ac_get_property(struct power_supply *b, 180 enum power_supply_property psp, 181 union power_supply_propval *val) 182 { 183 struct micro_battery *mb = dev_get_drvdata(b->dev.parent); 184 185 switch (psp) { 186 case POWER_SUPPLY_PROP_ONLINE: 187 val->intval = mb->ac; 188 break; 189 default: 190 return -EINVAL; 191 }; 192 193 return 0; 194 } 195 196 static enum power_supply_property micro_batt_power_props[] = { 197 POWER_SUPPLY_PROP_TECHNOLOGY, 198 POWER_SUPPLY_PROP_STATUS, 199 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 200 POWER_SUPPLY_PROP_CAPACITY, 201 POWER_SUPPLY_PROP_TEMP, 202 POWER_SUPPLY_PROP_VOLTAGE_NOW, 203 }; 204 205 static const struct power_supply_desc micro_batt_power_desc = { 206 .name = "main-battery", 207 .type = POWER_SUPPLY_TYPE_BATTERY, 208 .properties = micro_batt_power_props, 209 .num_properties = ARRAY_SIZE(micro_batt_power_props), 210 .get_property = micro_batt_get_property, 211 .use_for_apm = 1, 212 }; 213 214 static enum power_supply_property micro_ac_power_props[] = { 215 POWER_SUPPLY_PROP_ONLINE, 216 }; 217 218 static const struct power_supply_desc micro_ac_power_desc = { 219 .name = "ac", 220 .type = POWER_SUPPLY_TYPE_MAINS, 221 .properties = micro_ac_power_props, 222 .num_properties = ARRAY_SIZE(micro_ac_power_props), 223 .get_property = micro_ac_get_property, 224 }; 225 226 static struct power_supply *micro_batt_power, *micro_ac_power; 227 228 static int micro_batt_probe(struct platform_device *pdev) 229 { 230 struct micro_battery *mb; 231 int ret; 232 233 mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL); 234 if (!mb) 235 return -ENOMEM; 236 237 mb->micro = dev_get_drvdata(pdev->dev.parent); 238 mb->wq = alloc_workqueue("ipaq-battery-wq", WQ_MEM_RECLAIM, 0); 239 if (!mb->wq) 240 return -ENOMEM; 241 242 INIT_DELAYED_WORK(&mb->update, micro_battery_work); 243 platform_set_drvdata(pdev, mb); 244 queue_delayed_work(mb->wq, &mb->update, 1); 245 246 micro_batt_power = power_supply_register(&pdev->dev, 247 µ_batt_power_desc, NULL); 248 if (IS_ERR(micro_batt_power)) { 249 ret = PTR_ERR(micro_batt_power); 250 goto batt_err; 251 } 252 253 micro_ac_power = power_supply_register(&pdev->dev, 254 µ_ac_power_desc, NULL); 255 if (IS_ERR(micro_ac_power)) { 256 ret = PTR_ERR(micro_ac_power); 257 goto ac_err; 258 } 259 260 dev_info(&pdev->dev, "iPAQ micro battery driver\n"); 261 return 0; 262 263 ac_err: 264 power_supply_unregister(micro_batt_power); 265 batt_err: 266 cancel_delayed_work_sync(&mb->update); 267 destroy_workqueue(mb->wq); 268 return ret; 269 } 270 271 static int micro_batt_remove(struct platform_device *pdev) 272 273 { 274 struct micro_battery *mb = platform_get_drvdata(pdev); 275 276 power_supply_unregister(micro_ac_power); 277 power_supply_unregister(micro_batt_power); 278 cancel_delayed_work_sync(&mb->update); 279 destroy_workqueue(mb->wq); 280 281 return 0; 282 } 283 284 static int __maybe_unused micro_batt_suspend(struct device *dev) 285 { 286 struct micro_battery *mb = dev_get_drvdata(dev); 287 288 cancel_delayed_work_sync(&mb->update); 289 return 0; 290 } 291 292 static int __maybe_unused micro_batt_resume(struct device *dev) 293 { 294 struct micro_battery *mb = dev_get_drvdata(dev); 295 296 queue_delayed_work(mb->wq, &mb->update, msecs_to_jiffies(BATT_PERIOD)); 297 return 0; 298 } 299 300 static const struct dev_pm_ops micro_batt_dev_pm_ops = { 301 SET_SYSTEM_SLEEP_PM_OPS(micro_batt_suspend, micro_batt_resume) 302 }; 303 304 static struct platform_driver micro_batt_device_driver = { 305 .driver = { 306 .name = "ipaq-micro-battery", 307 .pm = µ_batt_dev_pm_ops, 308 }, 309 .probe = micro_batt_probe, 310 .remove = micro_batt_remove, 311 }; 312 module_platform_driver(micro_batt_device_driver); 313 314 MODULE_LICENSE("GPL"); 315 MODULE_DESCRIPTION("driver for iPAQ Atmel micro battery"); 316 MODULE_ALIAS("platform:ipaq-micro-battery"); 317