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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) ST-Ericsson SA 2012
0004  *
0005  * Battery temperature driver for AB8500
0006  *
0007  * Author:
0008  *  Johan Palsson <johan.palsson@stericsson.com>
0009  *  Karl Komierowski <karl.komierowski@stericsson.com>
0010  *  Arun R Murthy <arun.murthy@stericsson.com>
0011  */
0012 
0013 #include <linux/init.h>
0014 #include <linux/module.h>
0015 #include <linux/device.h>
0016 #include <linux/component.h>
0017 #include <linux/interrupt.h>
0018 #include <linux/delay.h>
0019 #include <linux/slab.h>
0020 #include <linux/platform_device.h>
0021 #include <linux/power_supply.h>
0022 #include <linux/completion.h>
0023 #include <linux/workqueue.h>
0024 #include <linux/jiffies.h>
0025 #include <linux/of.h>
0026 #include <linux/mfd/core.h>
0027 #include <linux/mfd/abx500.h>
0028 #include <linux/mfd/abx500/ab8500.h>
0029 #include <linux/thermal.h>
0030 #include <linux/iio/consumer.h>
0031 #include <linux/fixp-arith.h>
0032 
0033 #include "ab8500-bm.h"
0034 
0035 #define BTEMP_THERMAL_LOW_LIMIT     -10
0036 #define BTEMP_THERMAL_MED_LIMIT     0
0037 #define BTEMP_THERMAL_HIGH_LIMIT_52 52
0038 #define BTEMP_THERMAL_HIGH_LIMIT_57 57
0039 #define BTEMP_THERMAL_HIGH_LIMIT_62 62
0040 
0041 #define BTEMP_BATCTRL_CURR_SRC_7UA  7
0042 #define BTEMP_BATCTRL_CURR_SRC_20UA 20
0043 
0044 #define BTEMP_BATCTRL_CURR_SRC_16UA 16
0045 #define BTEMP_BATCTRL_CURR_SRC_18UA 18
0046 
0047 #define BTEMP_BATCTRL_CURR_SRC_60UA 60
0048 #define BTEMP_BATCTRL_CURR_SRC_120UA    120
0049 
0050 /**
0051  * struct ab8500_btemp_interrupts - ab8500 interrupts
0052  * @name:   name of the interrupt
0053  * @isr     function pointer to the isr
0054  */
0055 struct ab8500_btemp_interrupts {
0056     char *name;
0057     irqreturn_t (*isr)(int irq, void *data);
0058 };
0059 
0060 struct ab8500_btemp_events {
0061     bool batt_rem;
0062     bool btemp_high;
0063     bool btemp_medhigh;
0064     bool btemp_lowmed;
0065     bool btemp_low;
0066     bool ac_conn;
0067     bool usb_conn;
0068 };
0069 
0070 struct ab8500_btemp_ranges {
0071     int btemp_high_limit;
0072     int btemp_med_limit;
0073     int btemp_low_limit;
0074 };
0075 
0076 /**
0077  * struct ab8500_btemp - ab8500 BTEMP device information
0078  * @dev:        Pointer to the structure device
0079  * @node:       List of AB8500 BTEMPs, hence prepared for reentrance
0080  * @curr_source:    What current source we use, in uA
0081  * @bat_temp:       Dispatched battery temperature in degree Celsius
0082  * @prev_bat_temp   Last measured battery temperature in degree Celsius
0083  * @parent:     Pointer to the struct ab8500
0084  * @tz:         Thermal zone for the battery
0085  * @adc_bat_ctrl:   ADC channel for the battery control
0086  * @fg:         Pointer to the struct fg
0087  * @bm:             Platform specific battery management information
0088  * @btemp_psy:      Structure for BTEMP specific battery properties
0089  * @events:     Structure for information about events triggered
0090  * @btemp_ranges:   Battery temperature range structure
0091  * @btemp_wq:       Work queue for measuring the temperature periodically
0092  * @btemp_periodic_work:    Work for measuring the temperature periodically
0093  * @initialized:    True if battery id read.
0094  */
0095 struct ab8500_btemp {
0096     struct device *dev;
0097     struct list_head node;
0098     int curr_source;
0099     int bat_temp;
0100     int prev_bat_temp;
0101     struct ab8500 *parent;
0102     struct thermal_zone_device *tz;
0103     struct iio_channel *bat_ctrl;
0104     struct ab8500_fg *fg;
0105     struct ab8500_bm_data *bm;
0106     struct power_supply *btemp_psy;
0107     struct ab8500_btemp_events events;
0108     struct ab8500_btemp_ranges btemp_ranges;
0109     struct workqueue_struct *btemp_wq;
0110     struct delayed_work btemp_periodic_work;
0111     bool initialized;
0112 };
0113 
0114 /* BTEMP power supply properties */
0115 static enum power_supply_property ab8500_btemp_props[] = {
0116     POWER_SUPPLY_PROP_PRESENT,
0117     POWER_SUPPLY_PROP_ONLINE,
0118     POWER_SUPPLY_PROP_TECHNOLOGY,
0119     POWER_SUPPLY_PROP_TEMP,
0120 };
0121 
0122 static LIST_HEAD(ab8500_btemp_list);
0123 
0124 /**
0125  * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
0126  * @di:     pointer to the ab8500_btemp structure
0127  * @v_batctrl:  measured batctrl voltage
0128  * @inst_curr:  measured instant current
0129  *
0130  * This function returns the battery resistance that is
0131  * derived from the BATCTRL voltage.
0132  * Returns value in Ohms.
0133  */
0134 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
0135     int v_batctrl, int inst_curr)
0136 {
0137     if (is_ab8500_1p1_or_earlier(di->parent)) {
0138         /*
0139          * For ABB cut1.0 and 1.1 BAT_CTRL is internally
0140          * connected to 1.8V through a 450k resistor
0141          */
0142         return (450000 * (v_batctrl)) / (1800 - v_batctrl);
0143     }
0144 
0145     /*
0146      * BAT_CTRL is internally
0147      * connected to 1.8V through a 80k resistor
0148      */
0149     return (80000 * (v_batctrl)) / (1800 - v_batctrl);
0150 }
0151 
0152 /**
0153  * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
0154  * @di:     pointer to the ab8500_btemp structure
0155  *
0156  * This function returns the voltage on BATCTRL. Returns value in mV.
0157  */
0158 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
0159 {
0160     int vbtemp, ret;
0161     static int prev;
0162 
0163     ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
0164     if (ret < 0) {
0165         dev_err(di->dev,
0166             "%s ADC conversion failed, using previous value",
0167             __func__);
0168         return prev;
0169     }
0170     prev = vbtemp;
0171     return vbtemp;
0172 }
0173 
0174 /**
0175  * ab8500_btemp_get_batctrl_res() - get battery resistance
0176  * @di:     pointer to the ab8500_btemp structure
0177  *
0178  * This function returns the battery pack identification resistance.
0179  * Returns value in Ohms.
0180  */
0181 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
0182 {
0183     int ret;
0184     int batctrl = 0;
0185     int res;
0186     int inst_curr;
0187     int i;
0188 
0189     if (!di->fg)
0190         di->fg = ab8500_fg_get();
0191     if (!di->fg) {
0192         dev_err(di->dev, "No fg found\n");
0193         return -EINVAL;
0194     }
0195 
0196     ret = ab8500_fg_inst_curr_start(di->fg);
0197 
0198     if (ret) {
0199         dev_err(di->dev, "Failed to start current measurement\n");
0200         return ret;
0201     }
0202 
0203     do {
0204         msleep(20);
0205     } while (!ab8500_fg_inst_curr_started(di->fg));
0206 
0207     i = 0;
0208 
0209     do {
0210         batctrl += ab8500_btemp_read_batctrl_voltage(di);
0211         i++;
0212         msleep(20);
0213     } while (!ab8500_fg_inst_curr_done(di->fg));
0214     batctrl /= i;
0215 
0216     ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
0217     if (ret) {
0218         dev_err(di->dev, "Failed to finalize current measurement\n");
0219         return ret;
0220     }
0221 
0222     res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
0223 
0224     dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
0225         __func__, batctrl, res, inst_curr, i);
0226 
0227     return res;
0228 }
0229 
0230 /**
0231  * ab8500_btemp_id() - Identify the connected battery
0232  * @di:     pointer to the ab8500_btemp structure
0233  *
0234  * This function will try to identify the battery by reading the ID
0235  * resistor. Some brands use a combined ID resistor with a NTC resistor to
0236  * both be able to identify and to read the temperature of it.
0237  */
0238 static int ab8500_btemp_id(struct ab8500_btemp *di)
0239 {
0240     struct power_supply_battery_info *bi = di->bm->bi;
0241     int res;
0242 
0243     di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
0244 
0245     res =  ab8500_btemp_get_batctrl_res(di);
0246     if (res < 0) {
0247         dev_err(di->dev, "%s get batctrl res failed\n", __func__);
0248         return -ENXIO;
0249     }
0250 
0251     if (power_supply_battery_bti_in_range(bi, res)) {
0252         dev_info(di->dev, "Battery detected on BATCTRL (pin C3)"
0253              " resistance %d Ohm = %d Ohm +/- %d%%\n",
0254              res, bi->bti_resistance_ohm,
0255              bi->bti_resistance_tolerance);
0256     } else {
0257         dev_warn(di->dev, "Battery identified as unknown"
0258              ", resistance %d Ohm\n", res);
0259         return -ENXIO;
0260     }
0261 
0262     return 0;
0263 }
0264 
0265 /**
0266  * ab8500_btemp_periodic_work() - Measuring the temperature periodically
0267  * @work:   pointer to the work_struct structure
0268  *
0269  * Work function for measuring the temperature periodically
0270  */
0271 static void ab8500_btemp_periodic_work(struct work_struct *work)
0272 {
0273     int interval;
0274     int bat_temp;
0275     struct ab8500_btemp *di = container_of(work,
0276         struct ab8500_btemp, btemp_periodic_work.work);
0277     /* Assume 25 degrees celsius as start temperature */
0278     static int prev = 25;
0279     int ret;
0280 
0281     if (!di->initialized) {
0282         /* Identify the battery */
0283         if (ab8500_btemp_id(di) < 0)
0284             dev_warn(di->dev, "failed to identify the battery\n");
0285     }
0286 
0287     /* Failover if a reading is erroneous, use last meausurement */
0288     ret = thermal_zone_get_temp(di->tz, &bat_temp);
0289     if (ret) {
0290         dev_err(di->dev, "error reading temperature\n");
0291         bat_temp = prev;
0292     } else {
0293         /* Convert from millicentigrades to centigrades */
0294         bat_temp /= 1000;
0295         prev = bat_temp;
0296     }
0297 
0298     /*
0299      * Filter battery temperature.
0300      * Allow direct updates on temperature only if two samples result in
0301      * same temperature. Else only allow 1 degree change from previous
0302      * reported value in the direction of the new measurement.
0303      */
0304     if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
0305         if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
0306             di->initialized = true;
0307             di->bat_temp = bat_temp;
0308             power_supply_changed(di->btemp_psy);
0309         }
0310     } else if (bat_temp < di->prev_bat_temp) {
0311         di->bat_temp--;
0312         power_supply_changed(di->btemp_psy);
0313     } else if (bat_temp > di->prev_bat_temp) {
0314         di->bat_temp++;
0315         power_supply_changed(di->btemp_psy);
0316     }
0317     di->prev_bat_temp = bat_temp;
0318 
0319     if (di->events.ac_conn || di->events.usb_conn)
0320         interval = di->bm->temp_interval_chg;
0321     else
0322         interval = di->bm->temp_interval_nochg;
0323 
0324     /* Schedule a new measurement */
0325     queue_delayed_work(di->btemp_wq,
0326         &di->btemp_periodic_work,
0327         round_jiffies(interval * HZ));
0328 }
0329 
0330 /**
0331  * ab8500_btemp_batctrlindb_handler() - battery removal detected
0332  * @irq:       interrupt number
0333  * @_di:       void pointer that has to address of ab8500_btemp
0334  *
0335  * Returns IRQ status(IRQ_HANDLED)
0336  */
0337 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
0338 {
0339     struct ab8500_btemp *di = _di;
0340     dev_err(di->dev, "Battery removal detected!\n");
0341 
0342     di->events.batt_rem = true;
0343     power_supply_changed(di->btemp_psy);
0344 
0345     return IRQ_HANDLED;
0346 }
0347 
0348 /**
0349  * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
0350  * @irq:       interrupt number
0351  * @_di:       void pointer that has to address of ab8500_btemp
0352  *
0353  * Returns IRQ status(IRQ_HANDLED)
0354  */
0355 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
0356 {
0357     struct ab8500_btemp *di = _di;
0358 
0359     if (is_ab8500_3p3_or_earlier(di->parent)) {
0360         dev_dbg(di->dev, "Ignore false btemp low irq"
0361             " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
0362     } else {
0363         dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
0364 
0365         di->events.btemp_low = true;
0366         di->events.btemp_high = false;
0367         di->events.btemp_medhigh = false;
0368         di->events.btemp_lowmed = false;
0369         power_supply_changed(di->btemp_psy);
0370     }
0371 
0372     return IRQ_HANDLED;
0373 }
0374 
0375 /**
0376  * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
0377  * @irq:       interrupt number
0378  * @_di:       void pointer that has to address of ab8500_btemp
0379  *
0380  * Returns IRQ status(IRQ_HANDLED)
0381  */
0382 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
0383 {
0384     struct ab8500_btemp *di = _di;
0385 
0386     dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
0387 
0388     di->events.btemp_high = true;
0389     di->events.btemp_medhigh = false;
0390     di->events.btemp_lowmed = false;
0391     di->events.btemp_low = false;
0392     power_supply_changed(di->btemp_psy);
0393 
0394     return IRQ_HANDLED;
0395 }
0396 
0397 /**
0398  * ab8500_btemp_lowmed_handler() - battery temp between low and medium
0399  * @irq:       interrupt number
0400  * @_di:       void pointer that has to address of ab8500_btemp
0401  *
0402  * Returns IRQ status(IRQ_HANDLED)
0403  */
0404 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
0405 {
0406     struct ab8500_btemp *di = _di;
0407 
0408     dev_dbg(di->dev, "Battery temperature is between low and medium\n");
0409 
0410     di->events.btemp_lowmed = true;
0411     di->events.btemp_medhigh = false;
0412     di->events.btemp_high = false;
0413     di->events.btemp_low = false;
0414     power_supply_changed(di->btemp_psy);
0415 
0416     return IRQ_HANDLED;
0417 }
0418 
0419 /**
0420  * ab8500_btemp_medhigh_handler() - battery temp between medium and high
0421  * @irq:       interrupt number
0422  * @_di:       void pointer that has to address of ab8500_btemp
0423  *
0424  * Returns IRQ status(IRQ_HANDLED)
0425  */
0426 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
0427 {
0428     struct ab8500_btemp *di = _di;
0429 
0430     dev_dbg(di->dev, "Battery temperature is between medium and high\n");
0431 
0432     di->events.btemp_medhigh = true;
0433     di->events.btemp_lowmed = false;
0434     di->events.btemp_high = false;
0435     di->events.btemp_low = false;
0436     power_supply_changed(di->btemp_psy);
0437 
0438     return IRQ_HANDLED;
0439 }
0440 
0441 /**
0442  * ab8500_btemp_periodic() - Periodic temperature measurements
0443  * @di:     pointer to the ab8500_btemp structure
0444  * @enable: enable or disable periodic temperature measurements
0445  *
0446  * Starts of stops periodic temperature measurements. Periodic measurements
0447  * should only be done when a charger is connected.
0448  */
0449 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
0450     bool enable)
0451 {
0452     dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
0453         enable);
0454     /*
0455      * Make sure a new measurement is done directly by cancelling
0456      * any pending work
0457      */
0458     cancel_delayed_work_sync(&di->btemp_periodic_work);
0459 
0460     if (enable)
0461         queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
0462 }
0463 
0464 /**
0465  * ab8500_btemp_get_temp() - get battery temperature
0466  * @di:     pointer to the ab8500_btemp structure
0467  *
0468  * Returns battery temperature
0469  */
0470 static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
0471 {
0472     int temp = 0;
0473 
0474     /*
0475      * The BTEMP events are not reliabe on AB8500 cut3.3
0476      * and prior versions
0477      */
0478     if (is_ab8500_3p3_or_earlier(di->parent)) {
0479         temp = di->bat_temp * 10;
0480     } else {
0481         if (di->events.btemp_low) {
0482             if (temp > di->btemp_ranges.btemp_low_limit)
0483                 temp = di->btemp_ranges.btemp_low_limit * 10;
0484             else
0485                 temp = di->bat_temp * 10;
0486         } else if (di->events.btemp_high) {
0487             if (temp < di->btemp_ranges.btemp_high_limit)
0488                 temp = di->btemp_ranges.btemp_high_limit * 10;
0489             else
0490                 temp = di->bat_temp * 10;
0491         } else if (di->events.btemp_lowmed) {
0492             if (temp > di->btemp_ranges.btemp_med_limit)
0493                 temp = di->btemp_ranges.btemp_med_limit * 10;
0494             else
0495                 temp = di->bat_temp * 10;
0496         } else if (di->events.btemp_medhigh) {
0497             if (temp < di->btemp_ranges.btemp_med_limit)
0498                 temp = di->btemp_ranges.btemp_med_limit * 10;
0499             else
0500                 temp = di->bat_temp * 10;
0501         } else
0502             temp = di->bat_temp * 10;
0503     }
0504     return temp;
0505 }
0506 
0507 /**
0508  * ab8500_btemp_get_property() - get the btemp properties
0509  * @psy:        pointer to the power_supply structure
0510  * @psp:        pointer to the power_supply_property structure
0511  * @val:        pointer to the power_supply_propval union
0512  *
0513  * This function gets called when an application tries to get the btemp
0514  * properties by reading the sysfs files.
0515  * online:  presence of the battery
0516  * present: presence of the battery
0517  * technology:  battery technology
0518  * temp:    battery temperature
0519  * Returns error code in case of failure else 0(on success)
0520  */
0521 static int ab8500_btemp_get_property(struct power_supply *psy,
0522     enum power_supply_property psp,
0523     union power_supply_propval *val)
0524 {
0525     struct ab8500_btemp *di = power_supply_get_drvdata(psy);
0526 
0527     switch (psp) {
0528     case POWER_SUPPLY_PROP_PRESENT:
0529     case POWER_SUPPLY_PROP_ONLINE:
0530         if (di->events.batt_rem)
0531             val->intval = 0;
0532         else
0533             val->intval = 1;
0534         break;
0535     case POWER_SUPPLY_PROP_TECHNOLOGY:
0536         if (di->bm->bi)
0537             val->intval = di->bm->bi->technology;
0538         else
0539             val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
0540         break;
0541     case POWER_SUPPLY_PROP_TEMP:
0542         val->intval = ab8500_btemp_get_temp(di);
0543         break;
0544     default:
0545         return -EINVAL;
0546     }
0547     return 0;
0548 }
0549 
0550 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
0551 {
0552     struct power_supply *psy;
0553     struct power_supply *ext = dev_get_drvdata(dev);
0554     const char **supplicants = (const char **)ext->supplied_to;
0555     struct ab8500_btemp *di;
0556     union power_supply_propval ret;
0557     int j;
0558 
0559     psy = (struct power_supply *)data;
0560     di = power_supply_get_drvdata(psy);
0561 
0562     /*
0563      * For all psy where the name of your driver
0564      * appears in any supplied_to
0565      */
0566     j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
0567     if (j < 0)
0568         return 0;
0569 
0570     /* Go through all properties for the psy */
0571     for (j = 0; j < ext->desc->num_properties; j++) {
0572         enum power_supply_property prop;
0573         prop = ext->desc->properties[j];
0574 
0575         if (power_supply_get_property(ext, prop, &ret))
0576             continue;
0577 
0578         switch (prop) {
0579         case POWER_SUPPLY_PROP_PRESENT:
0580             switch (ext->desc->type) {
0581             case POWER_SUPPLY_TYPE_MAINS:
0582                 /* AC disconnected */
0583                 if (!ret.intval && di->events.ac_conn) {
0584                     di->events.ac_conn = false;
0585                 }
0586                 /* AC connected */
0587                 else if (ret.intval && !di->events.ac_conn) {
0588                     di->events.ac_conn = true;
0589                     if (!di->events.usb_conn)
0590                         ab8500_btemp_periodic(di, true);
0591                 }
0592                 break;
0593             case POWER_SUPPLY_TYPE_USB:
0594                 /* USB disconnected */
0595                 if (!ret.intval && di->events.usb_conn) {
0596                     di->events.usb_conn = false;
0597                 }
0598                 /* USB connected */
0599                 else if (ret.intval && !di->events.usb_conn) {
0600                     di->events.usb_conn = true;
0601                     if (!di->events.ac_conn)
0602                         ab8500_btemp_periodic(di, true);
0603                 }
0604                 break;
0605             default:
0606                 break;
0607             }
0608             break;
0609         default:
0610             break;
0611         }
0612     }
0613     return 0;
0614 }
0615 
0616 /**
0617  * ab8500_btemp_external_power_changed() - callback for power supply changes
0618  * @psy:       pointer to the structure power_supply
0619  *
0620  * This function is pointing to the function pointer external_power_changed
0621  * of the structure power_supply.
0622  * This function gets executed when there is a change in the external power
0623  * supply to the btemp.
0624  */
0625 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
0626 {
0627     struct ab8500_btemp *di = power_supply_get_drvdata(psy);
0628 
0629     class_for_each_device(power_supply_class, NULL,
0630         di->btemp_psy, ab8500_btemp_get_ext_psy_data);
0631 }
0632 
0633 /* ab8500 btemp driver interrupts and their respective isr */
0634 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
0635     {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
0636     {"BTEMP_LOW", ab8500_btemp_templow_handler},
0637     {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
0638     {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
0639     {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
0640 };
0641 
0642 static int __maybe_unused ab8500_btemp_resume(struct device *dev)
0643 {
0644     struct ab8500_btemp *di = dev_get_drvdata(dev);
0645 
0646     ab8500_btemp_periodic(di, true);
0647 
0648     return 0;
0649 }
0650 
0651 static int __maybe_unused ab8500_btemp_suspend(struct device *dev)
0652 {
0653     struct ab8500_btemp *di = dev_get_drvdata(dev);
0654 
0655     ab8500_btemp_periodic(di, false);
0656 
0657     return 0;
0658 }
0659 
0660 static char *supply_interface[] = {
0661     "ab8500_chargalg",
0662     "ab8500_fg",
0663 };
0664 
0665 static const struct power_supply_desc ab8500_btemp_desc = {
0666     .name           = "ab8500_btemp",
0667     .type           = POWER_SUPPLY_TYPE_BATTERY,
0668     .properties     = ab8500_btemp_props,
0669     .num_properties     = ARRAY_SIZE(ab8500_btemp_props),
0670     .get_property       = ab8500_btemp_get_property,
0671     .external_power_changed = ab8500_btemp_external_power_changed,
0672 };
0673 
0674 static int ab8500_btemp_bind(struct device *dev, struct device *master,
0675                  void *data)
0676 {
0677     struct ab8500_btemp *di = dev_get_drvdata(dev);
0678 
0679     /* Create a work queue for the btemp */
0680     di->btemp_wq =
0681         alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
0682     if (di->btemp_wq == NULL) {
0683         dev_err(dev, "failed to create work queue\n");
0684         return -ENOMEM;
0685     }
0686 
0687     /* Kick off periodic temperature measurements */
0688     ab8500_btemp_periodic(di, true);
0689 
0690     return 0;
0691 }
0692 
0693 static void ab8500_btemp_unbind(struct device *dev, struct device *master,
0694                 void *data)
0695 {
0696     struct ab8500_btemp *di = dev_get_drvdata(dev);
0697 
0698     /* Delete the work queue */
0699     destroy_workqueue(di->btemp_wq);
0700 }
0701 
0702 static const struct component_ops ab8500_btemp_component_ops = {
0703     .bind = ab8500_btemp_bind,
0704     .unbind = ab8500_btemp_unbind,
0705 };
0706 
0707 static int ab8500_btemp_probe(struct platform_device *pdev)
0708 {
0709     struct power_supply_config psy_cfg = {};
0710     struct device *dev = &pdev->dev;
0711     struct ab8500_btemp *di;
0712     int irq, i, ret = 0;
0713     u8 val;
0714 
0715     di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
0716     if (!di)
0717         return -ENOMEM;
0718 
0719     di->bm = &ab8500_bm_data;
0720 
0721     /* get parent data */
0722     di->dev = dev;
0723     di->parent = dev_get_drvdata(pdev->dev.parent);
0724 
0725     /* Get thermal zone and ADC */
0726     di->tz = thermal_zone_get_zone_by_name("battery-thermal");
0727     if (IS_ERR(di->tz)) {
0728         return dev_err_probe(dev, PTR_ERR(di->tz),
0729                      "failed to get battery thermal zone\n");
0730     }
0731     di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl");
0732     if (IS_ERR(di->bat_ctrl)) {
0733         ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl),
0734                     "failed to get BAT CTRL ADC channel\n");
0735         return ret;
0736     }
0737 
0738     di->initialized = false;
0739 
0740     psy_cfg.supplied_to = supply_interface;
0741     psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
0742     psy_cfg.drv_data = di;
0743 
0744     /* Init work for measuring temperature periodically */
0745     INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
0746         ab8500_btemp_periodic_work);
0747 
0748     /* Set BTEMP thermal limits. Low and Med are fixed */
0749     di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
0750     di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
0751 
0752     ret = abx500_get_register_interruptible(dev, AB8500_CHARGER,
0753         AB8500_BTEMP_HIGH_TH, &val);
0754     if (ret < 0) {
0755         dev_err(dev, "%s ab8500 read failed\n", __func__);
0756         return ret;
0757     }
0758     switch (val) {
0759     case BTEMP_HIGH_TH_57_0:
0760     case BTEMP_HIGH_TH_57_1:
0761         di->btemp_ranges.btemp_high_limit =
0762             BTEMP_THERMAL_HIGH_LIMIT_57;
0763         break;
0764     case BTEMP_HIGH_TH_52:
0765         di->btemp_ranges.btemp_high_limit =
0766             BTEMP_THERMAL_HIGH_LIMIT_52;
0767         break;
0768     case BTEMP_HIGH_TH_62:
0769         di->btemp_ranges.btemp_high_limit =
0770             BTEMP_THERMAL_HIGH_LIMIT_62;
0771         break;
0772     }
0773 
0774     /* Register BTEMP power supply class */
0775     di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
0776                            &psy_cfg);
0777     if (IS_ERR(di->btemp_psy)) {
0778         dev_err(dev, "failed to register BTEMP psy\n");
0779         return PTR_ERR(di->btemp_psy);
0780     }
0781 
0782     /* Register interrupts */
0783     for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
0784         irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
0785         if (irq < 0)
0786             return irq;
0787 
0788         ret = devm_request_threaded_irq(dev, irq, NULL,
0789             ab8500_btemp_irq[i].isr,
0790             IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT,
0791             ab8500_btemp_irq[i].name, di);
0792 
0793         if (ret) {
0794             dev_err(dev, "failed to request %s IRQ %d: %d\n"
0795                 , ab8500_btemp_irq[i].name, irq, ret);
0796             return ret;
0797         }
0798         dev_dbg(dev, "Requested %s IRQ %d: %d\n",
0799             ab8500_btemp_irq[i].name, irq, ret);
0800     }
0801 
0802     platform_set_drvdata(pdev, di);
0803 
0804     list_add_tail(&di->node, &ab8500_btemp_list);
0805 
0806     return component_add(dev, &ab8500_btemp_component_ops);
0807 }
0808 
0809 static int ab8500_btemp_remove(struct platform_device *pdev)
0810 {
0811     component_del(&pdev->dev, &ab8500_btemp_component_ops);
0812 
0813     return 0;
0814 }
0815 
0816 static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume);
0817 
0818 static const struct of_device_id ab8500_btemp_match[] = {
0819     { .compatible = "stericsson,ab8500-btemp", },
0820     { },
0821 };
0822 MODULE_DEVICE_TABLE(of, ab8500_btemp_match);
0823 
0824 struct platform_driver ab8500_btemp_driver = {
0825     .probe = ab8500_btemp_probe,
0826     .remove = ab8500_btemp_remove,
0827     .driver = {
0828         .name = "ab8500-btemp",
0829         .of_match_table = ab8500_btemp_match,
0830         .pm = &ab8500_btemp_pm_ops,
0831     },
0832 };
0833 MODULE_LICENSE("GPL v2");
0834 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
0835 MODULE_ALIAS("platform:ab8500-btemp");
0836 MODULE_DESCRIPTION("AB8500 battery temperature driver");
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