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authorArun Murthy <arun.murthy@stericsson.com>2011-05-26 16:50:32 +0530
committersaid m bagheri <ebgheri@steludxu2848.(none)>2011-06-29 10:30:31 +0200
commitaa185309939364372bfd446019eb58cab72dc2bb (patch)
tree883e96fd3a53fe2e631c2143cd487b9a11930158
parentc287d61c2353559cc2313b1a462c163b5b0c0465 (diff)
downloadlinux-2.6.38-lt-ux500-aa185309939364372bfd446019eb58cab72dc2bb.tar.gz
power: ab5500-btemp: temperature monitoring driver
Temperature monitoring driver for ab5500. Since temperature is the most important aspect of a battery, this driver monitors the battery temperature and takes precautionary measurements even in case of hardware failure. ST-Ericsson Linux next: Not Tested ST-Ericsson ID: WP332221 ST-Ericsson FOSS-OUT ID: Trivial Change-Id: Idd0a4a7f220ffa9693516757aba395ab7f75cfc2 Signed-off-by: Arun Murthy <arun.murthy@stericsson.com> Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/23152 Reviewed-by: QATEST Reviewed-by: Johan PALSSON <johan.palsson@stericsson.com> Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
-rw-r--r--drivers/power/ab5500_btemp.c870
1 files changed, 870 insertions, 0 deletions
diff --git a/drivers/power/ab5500_btemp.c b/drivers/power/ab5500_btemp.c
new file mode 100644
index 00000000000..57241c96f60
--- /dev/null
+++ b/drivers/power/ab5500_btemp.c
@@ -0,0 +1,870 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * Battery temperature driver for ab5500
+ *
+ * License Terms: GNU General Public License v2
+ * Authors:
+ * Johan Palsson <johan.palsson@stericsson.com>
+ * Karl Komierowski <karl.komierowski@stericsson.com>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/completion.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab5500.h>
+#include <linux/mfd/abx500/ab5500-bm.h>
+#include <linux/mfd/abx500/ab5500-gpadc.h>
+
+#define BTEMP_THERMAL_LOW_LIMIT -10
+#define BTEMP_THERMAL_MED_LIMIT 0
+#define BTEMP_THERMAL_HIGH_LIMIT_62 62
+
+#define BTEMP_BATCTRL_CURR_SRC_7UA 7
+#define BTEMP_BATCTRL_CURR_SRC_15UA 15
+#define BTEMP_BATCTRL_CURR_SRC_20UA 20
+
+#define UART_MODE 0x0F
+#define BAT_CUR_SRC 0x1F
+#define RESIS_ID_MODE 0x03
+#define RESET 0x00
+#define ADOUT_10K_PULL_UP 0x07
+
+#define to_ab5500_btemp_device_info(x) container_of((x), \
+ struct ab5500_btemp, btemp_psy);
+
+/**
+ * struct ab5500_btemp_interrupts - ab5500 interrupts
+ * @name: name of the interrupt
+ * @isr function pointer to the isr
+ */
+struct ab5500_btemp_interrupts {
+ char *name;
+ irqreturn_t (*isr)(int irq, void *data);
+};
+
+struct ab5500_btemp_events {
+ bool batt_rem;
+ bool usb_conn;
+};
+
+/**
+ * struct ab5500_btemp - ab5500 BTEMP device information
+ * @dev: Pointer to the structure device
+ * @chip_id: Chip-Id of the AB5500
+ * @curr_source: What current source we use, in uA
+ * @bat_temp: Battery temperature in degree Celcius
+ * @prev_bat_temp Last dispatched battery temperature
+ * @node: struct of type list_head
+ * @parent: Pointer to the struct ab5500
+ * @gpadc: Pointer to the struct gpadc
+ * @gpadc-auto: Pointer to the struct adc_auto_input
+ * @pdata: Pointer to the ab5500_btemp platform data
+ * @bat: Pointer to the ab5500_bm platform data
+ * @btemp_psy: Structure for BTEMP specific battery properties
+ * @events: Structure for information about events triggered
+ * @btemp_wq: Work queue for measuring the temperature periodically
+ * @btemp_periodic_work: Work for measuring the temperature periodically
+ */
+struct ab5500_btemp {
+ struct device *dev;
+ u8 chip_id;
+ int curr_source;
+ int bat_temp;
+ int prev_bat_temp;
+ struct list_head node;
+ struct ab5500 *parent;
+ struct ab5500_gpadc *gpadc;
+ struct adc_auto_input *gpadc_auto;
+ struct abx500_btemp_platform_data *pdata;
+ struct abx500_bm_data *bat;
+ struct power_supply btemp_psy;
+ struct ab5500_btemp_events events;
+ struct workqueue_struct *btemp_wq;
+ struct delayed_work btemp_periodic_work;
+};
+
+/* BTEMP power supply properties */
+static enum power_supply_property ab5500_btemp_props[] = {
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_TEMP,
+};
+
+static LIST_HEAD(ab5500_btemp_list);
+
+struct ab5500_btemp *ab5500_btemp_get(void)
+{
+ struct ab5500_btemp *di;
+ di = list_first_entry(&ab5500_btemp_list, struct ab5500_btemp, node);
+
+ return di;
+}
+
+/**
+ * ab5500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
+ * @di: pointer to the ab5500_btemp structure
+ * @v_batctrl: measured batctrl voltage
+ *
+ * This function returns the battery resistance that is
+ * derived from the BATCTRL voltage.
+ * Returns value in Ohms.
+ */
+static int ab5500_btemp_batctrl_volt_to_res(struct ab5500_btemp *di,
+ int v_batctrl)
+{
+ int rbs;
+
+ if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL) {
+ /*
+ * If the battery has internal NTC, we use the current
+ * source to calculate the resistance, 7uA or 20uA
+ */
+ rbs = v_batctrl * 1000 / di->curr_source;
+ } else {
+ /*
+ * BAT_CTRL is internally
+ * connected to 1.8V through a 10k resistor
+ */
+ rbs = (10000 * (v_batctrl)) / (1800 - v_batctrl);
+ }
+ return rbs;
+}
+
+/**
+ * ab5500_btemp_read_batctrl_voltage() - measure batctrl voltage
+ * @di: pointer to the ab5500_btemp structure
+ *
+ * This function returns the voltage on BATCTRL. Returns value in mV.
+ */
+static int ab5500_btemp_read_batctrl_voltage(struct ab5500_btemp *di)
+{
+ int vbtemp;
+ static int prev;
+
+ vbtemp = ab5500_gpadc_convert(di->gpadc, BAT_CTRL);
+ if (vbtemp < 0) {
+ dev_err(di->dev,
+ "%s gpadc conversion failed, using previous value",
+ __func__);
+ return prev;
+ }
+ prev = vbtemp;
+ return vbtemp;
+}
+
+/**
+ * ab5500_btemp_curr_source_enable() - enable/disable batctrl current source
+ * @di: pointer to the ab5500_btemp structure
+ * @enable: enable or disable the current source
+ *
+ * Enable or disable the current sources for the BatCtrl AD channel
+ */
+static int ab5500_btemp_curr_source_enable(struct ab5500_btemp *di,
+ bool enable)
+{
+ int ret = 0;
+
+ /* Only do this for batteries with internal NTC */
+ if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
+
+ dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
+
+ ret = abx500_mask_and_set_register_interruptible(di->dev,
+ AB5500_BANK_FG_BATTCOM_ACC, AB5500_UART,
+ UART_MODE, RESIS_ID_MODE);
+ if (ret) {
+ dev_err(di->dev,
+ "%s failed setting resistance identification mode\n",
+ __func__);
+ return ret;
+ }
+
+ ret = abx500_mask_and_set_register_interruptible(di->dev,
+ AB5500_BANK_FG_BATTCOM_ACC, AB5500_URI,
+ BAT_CUR_SRC, BAT_CTRL_15U_ENA);
+ if (ret) {
+ dev_err(di->dev, "%s failed enabling current source\n",
+ __func__);
+ goto disable_curr_source;
+ }
+ } else if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
+ dev_dbg(di->dev, "Disable BATCTRL curr source\n");
+
+ /* Write 0 to the curr bits */
+ ret = abx500_mask_and_set_register_interruptible(di->dev,
+ AB5500_BANK_FG_BATTCOM_ACC, AB5500_URI,
+ BAT_CUR_SRC, RESET);
+ if (ret) {
+ dev_err(di->dev, "%s failed disabling current source\n",
+ __func__);
+ goto disable_curr_source;
+ }
+
+ ret = abx500_mask_and_set_register_interruptible(di->dev,
+ AB5500_BANK_FG_BATTCOM_ACC, AB5500_UART,
+ UART_MODE, RESET);
+ if (ret) {
+ dev_err(di->dev, "%s failed disabling force comp\n",
+ __func__);
+ }
+ }
+ return ret;
+disable_curr_source:
+ /* Write 0 to the curr bits */
+ ret = abx500_mask_and_set_register_interruptible(di->dev,
+ AB5500_BANK_FG_BATTCOM_ACC, AB5500_URI,
+ BAT_CUR_SRC, RESET);
+ if (ret) {
+ dev_err(di->dev, "%s failed disabling current source\n",
+ __func__);
+ }
+ return ret;
+}
+
+/**
+ * ab5500_btemp_get_batctrl_res() - get battery resistance
+ * @di: pointer to the ab5500_btemp structure
+ *
+ * This function returns the battery pack identification resistance.
+ * Returns value in Ohms.
+ */
+static int ab5500_btemp_get_batctrl_res(struct ab5500_btemp *di)
+{
+ int ret;
+ int batctrl;
+ int res;
+
+ ret = ab5500_btemp_curr_source_enable(di, true);
+ /* TODO: This delay has to be optimised */
+ mdelay(1000);
+ if (ret) {
+ dev_err(di->dev, "%s curr source enable failed\n", __func__);
+ return ret;
+ }
+
+ batctrl = ab5500_btemp_read_batctrl_voltage(di);
+ res = ab5500_btemp_batctrl_volt_to_res(di, batctrl);
+
+ ret = ab5500_btemp_curr_source_enable(di, false);
+ if (ret) {
+ dev_err(di->dev, "%s curr source disable failed\n", __func__);
+ return ret;
+ }
+
+ dev_dbg(di->dev, "%s batctrl: %d res: %d ",
+ __func__, batctrl, res);
+
+ return res;
+}
+
+/**
+ * ab5500_btemp_res_to_temp() - resistance to temperature
+ * @di: pointer to the ab5500_btemp structure
+ * @tbl: pointer to the resiatance to temperature table
+ * @tbl_size: size of the resistance to temperature table
+ * @res: resistance to calculate the temperature from
+ *
+ * This function returns the battery temperature in degrees Celcius
+ * based on the NTC resistance.
+ */
+static int ab5500_btemp_res_to_temp(struct ab5500_btemp *di,
+ const struct abx500_res_to_temp *tbl, int tbl_size, int res)
+{
+ int i, temp;
+ /*
+ * Calculate the formula for the straight line
+ * Simple interpolation if we are within
+ * the resistance table limits, extrapolate
+ * if resistance is outside the limits.
+ */
+ if (res > tbl[0].resist)
+ i = 0;
+ else if (res <= tbl[tbl_size - 1].resist)
+ i = tbl_size - 2;
+ else {
+ i = 0;
+ while (!(res <= tbl[i].resist &&
+ res > tbl[i + 1].resist))
+ i++;
+ }
+
+ temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
+ (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
+ return temp;
+}
+
+/**
+ * ab5500_btemp_measure_temp() - measure battery temperature
+ * @di: pointer to the ab5500_btemp structure
+ *
+ * Returns battery temperature (on success) else the previous temperature
+ */
+static int ab5500_btemp_measure_temp(struct ab5500_btemp *di)
+{
+ int temp, ret;
+ static int prev;
+ int rbat, vntc;
+ int rntc = 0;
+ u8 id;
+
+ id = di->bat->batt_id;
+ if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
+ id != BATTERY_UNKNOWN) {
+ rbat = ab5500_btemp_get_batctrl_res(di);
+ if (rbat < 0) {
+ dev_err(di->dev, "%s get batctrl res failed\n",
+ __func__);
+ /*
+ * Return out-of-range temperature so that
+ * charging is stopped
+ */
+ return BTEMP_THERMAL_LOW_LIMIT;
+ }
+
+ temp = ab5500_btemp_res_to_temp(di,
+ di->bat->bat_type[id].r_to_t_tbl,
+ di->bat->bat_type[id].n_temp_tbl_elements, rbat);
+ } else {
+ ret = abx500_mask_and_set_register_interruptible(di->dev,
+ AB5500_BANK_FG_BATTCOM_ACC, AB5500_UART,
+ UART_MODE, ADOUT_10K_PULL_UP);
+ if (ret) {
+ dev_err(di->dev,
+ "failed to enable 10k pull up to Vadout\n");
+ }
+ vntc = ab5500_gpadc_convert(di->gpadc, BTEMP_BALL);
+ if (vntc < 0) {
+ dev_err(di->dev,
+ "%s gpadc conversion failed,"
+ " using previous value\n", __func__);
+ return prev;
+ }
+ /*
+ * The PCB NTC is sourced from 2.75v via a 10kOhm
+ * resistor.
+ */
+ rntc = 10000 * vntc / (27500 - vntc);
+
+ temp = ab5500_btemp_res_to_temp(di,
+ di->bat->bat_type[id].r_to_t_tbl,
+ di->bat->bat_type[id].n_temp_tbl_elements, rntc);
+ prev = temp;
+ }
+ dev_dbg(di->dev, "Battery temperature is %d\n", temp);
+ return temp;
+}
+
+/**
+ * ab5500_btemp_id() - Identify the connected battery
+ * @di: pointer to the ab5500_btemp structure
+ *
+ * This function will try to identify the battery by reading the ID
+ * resistor. Some brands use a combined ID resistor with a NTC resistor to
+ * both be able to identify and to read the temperature of it.
+ */
+static int ab5500_btemp_id(struct ab5500_btemp *di)
+{
+ int res;
+ u8 i;
+
+ di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
+ di->bat->batt_id = BATTERY_UNKNOWN;
+
+ res = ab5500_btemp_get_batctrl_res(di);
+ if (res < 0) {
+ dev_err(di->dev, "%s get batctrl res failed\n", __func__);
+ return -ENXIO;
+ }
+
+ /* BATTERY_UNKNOWN is defined on position 0, skip it! */
+ for (i = BATTERY_UNKNOWN + 1; i < di->bat->n_btypes; i++) {
+ if ((res <= di->bat->bat_type[i].resis_high) &&
+ (res >= di->bat->bat_type[i].resis_low)) {
+ dev_dbg(di->dev, "Battery detected on %s"
+ " low %d < res %d < high: %d"
+ " index: %d\n",
+ di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL ?
+ "BATCTRL" : "BATTEMP",
+ di->bat->bat_type[i].resis_low, res,
+ di->bat->bat_type[i].resis_high, i);
+
+ di->bat->batt_id = i;
+ break;
+ }
+ }
+
+ if (di->bat->batt_id == BATTERY_UNKNOWN) {
+ dev_warn(di->dev, "Battery identified as unknown"
+ ", resistance %d Ohm\n", res);
+ return -ENXIO;
+ }
+
+ /*
+ * We only have to change current source if the
+ * detected type is Type 1, else we use the 7uA source
+ */
+ if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
+ di->bat->batt_id == 1) {
+ dev_dbg(di->dev, "Set BATCTRL current source to 15uA\n");
+ di->curr_source = BTEMP_BATCTRL_CURR_SRC_15UA;
+ }
+
+ return di->bat->batt_id;
+}
+
+/**
+ * ab5500_btemp_periodic_work() - Measuring the temperature periodically
+ * @work: pointer to the work_struct structure
+ *
+ * Work function for measuring the temperature periodically
+ */
+static void ab5500_btemp_periodic_work(struct work_struct *work)
+{
+ struct ab5500_btemp *di = container_of(work,
+ struct ab5500_btemp, btemp_periodic_work.work);
+
+ di->bat_temp = ab5500_btemp_measure_temp(di);
+
+ if (di->bat_temp != di->prev_bat_temp) {
+ di->prev_bat_temp = di->bat_temp;
+ power_supply_changed(&di->btemp_psy);
+ }
+ di->bat->temp_now = di->bat_temp;
+
+ /* Schedule a new measurement */
+ queue_delayed_work(di->btemp_wq,
+ &di->btemp_periodic_work,
+ round_jiffies(20 * HZ));
+}
+
+/**
+ * ab5500_btemp_batt_removal_handler() - battery removal detected
+ * @irq: interrupt number
+ * @_di: void pointer that has to address of ab5500_btemp
+ *
+ * Returns IRQ status(IRQ_HANDLED)
+ */
+static irqreturn_t ab5500_btemp_batt_removal_handler(int irq, void *_di)
+{
+ struct ab5500_btemp *di = _di;
+ dev_err(di->dev, "Battery removal detected!\n");
+
+ di->events.batt_rem = true;
+ power_supply_changed(&di->btemp_psy);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * ab5500_btemp_batt_attach_handler() - battery insertion detected
+ * @irq: interrupt number
+ * @_di: void pointer that has to address of ab5500_btemp
+ *
+ * Returns IRQ status(IRQ_HANDLED)
+ */
+static irqreturn_t ab5500_btemp_batt_attach_handler(int irq, void *_di)
+{
+ struct ab5500_btemp *di = _di;
+ dev_err(di->dev, "Battery attached!\n");
+
+ di->events.batt_rem = false;
+ power_supply_changed(&di->btemp_psy);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * ab5500_btemp_periodic() - Periodic temperature measurements
+ * @di: pointer to the ab5500_btemp structure
+ * @enable: enable or disable periodic temperature measurements
+ *
+ * Starts of stops periodic temperature measurements. Periodic measurements
+ * should only be done when a charger is connected.
+ */
+static void ab5500_btemp_periodic(struct ab5500_btemp *di,
+ bool enable)
+{
+ dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
+ enable);
+
+ if (enable)
+ queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
+ else
+ cancel_delayed_work_sync(&di->btemp_periodic_work);
+}
+
+/**
+ * ab5500_btemp_get_property() - get the btemp properties
+ * @psy: pointer to the power_supply structure
+ * @psp: pointer to the power_supply_property structure
+ * @val: pointer to the power_supply_propval union
+ *
+ * This function gets called when an application tries to get the btemp
+ * properties by reading the sysfs files.
+ * online: presence of the battery
+ * present: presence of the battery
+ * technology: battery technology
+ * temp: battery temperature
+ * Returns error code in case of failure else 0(on success)
+ */
+static int ab5500_btemp_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct ab5500_btemp *di;
+
+ di = to_ab5500_btemp_device_info(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ case POWER_SUPPLY_PROP_ONLINE:
+ if (di->events.batt_rem)
+ val->intval = 0;
+ else
+ val->intval = 1;
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = di->bat->bat_type[di->bat->batt_id].name;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = di->bat_temp * 10;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int ab5500_btemp_get_ext_psy_data(struct device *dev, void *data)
+{
+ struct power_supply *psy;
+ struct power_supply *ext;
+ struct ab5500_btemp *di;
+ union power_supply_propval ret;
+ int i, j;
+ bool psy_found = false;
+
+ psy = (struct power_supply *)data;
+ ext = dev_get_drvdata(dev);
+ di = to_ab5500_btemp_device_info(psy);
+
+ /*
+ * For all psy where the name of your driver
+ * appears in any supplied_to
+ */
+ for (i = 0; i < ext->num_supplicants; i++) {
+ if (!strcmp(ext->supplied_to[i], psy->name))
+ psy_found = true;
+ }
+
+ if (!psy_found)
+ return 0;
+
+ /* Go through all properties for the psy */
+ for (j = 0; j < ext->num_properties; j++) {
+ enum power_supply_property prop;
+ prop = ext->properties[j];
+
+ if (ext->get_property(ext, prop, &ret))
+ continue;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ switch (ext->type) {
+ case POWER_SUPPLY_TYPE_USB:
+ /* USB disconnected */
+ if (!ret.intval && di->events.usb_conn) {
+ di->events.usb_conn = false;
+ ab5500_btemp_periodic(di,
+ false);
+ }
+ /* USB connected */
+ else if (ret.intval && !di->events.usb_conn) {
+ di->events.usb_conn = true;
+ ab5500_btemp_periodic(di, true);
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ return 0;
+}
+
+/**
+ * ab5500_btemp_external_power_changed() - callback for power supply changes
+ * @psy: pointer to the structure power_supply
+ *
+ * This function is pointing to the function pointer external_power_changed
+ * of the structure power_supply.
+ * This function gets executed when there is a change in the external power
+ * supply to the btemp.
+ */
+static void ab5500_btemp_external_power_changed(struct power_supply *psy)
+{
+ struct ab5500_btemp *di = to_ab5500_btemp_device_info(psy);
+
+ class_for_each_device(power_supply_class, NULL,
+ &di->btemp_psy, ab5500_btemp_get_ext_psy_data);
+}
+
+/* ab5500 btemp driver interrupts and their respective isr */
+static struct ab5500_btemp_interrupts ab5500_btemp_irq[] = {
+ {"BATT_REMOVAL", ab5500_btemp_batt_removal_handler},
+ {"BATT_ATTACH", ab5500_btemp_batt_attach_handler},
+};
+static int ab5500_btemp_bat_temp_trig(int mux)
+{
+ struct ab5500_btemp *di = ab5500_btemp_get();
+
+ if (di->bat_temp < BTEMP_THERMAL_LOW_LIMIT) {
+ dev_err(di->dev,
+ "battery temp less than lower threshold (-10 deg cel)\n");
+ power_supply_changed(&di->btemp_psy);
+ } else if (di->bat_temp > BTEMP_THERMAL_HIGH_LIMIT_62) {
+ dev_err(di->dev, "battery temp greater them max threshold\n");
+ power_supply_changed(&di->btemp_psy);
+ }
+ return 0;;
+}
+
+static int ab5500_btemp_auto_temp(struct ab5500_btemp *di)
+{
+ struct adc_auto_input *auto_ip;
+ int ret = 0;
+
+ auto_ip = kzalloc(sizeof(struct adc_auto_input), GFP_KERNEL);
+ if (!auto_ip) {
+ dev_err(di->dev, "failed to allocate memory\n");
+ return -ENOMEM;
+ }
+
+ auto_ip->mux = BTEMP_BALL;
+ auto_ip->freq = MS500;
+ auto_ip->min = BTEMP_THERMAL_LOW_LIMIT;
+ auto_ip->max = BTEMP_THERMAL_HIGH_LIMIT_62;
+ auto_ip->auto_adc_callback = ab5500_btemp_bat_temp_trig;
+ di->gpadc_auto = auto_ip;
+ ret = ab5500_gpadc_convert_auto(di->gpadc, di->gpadc_auto);
+ if (ret)
+ dev_err(di->dev,
+ "failed to set auto trigger for battery temp\n");
+ return ret;
+}
+
+#if defined(CONFIG_PM)
+static int ab5500_btemp_resume(struct platform_device *pdev)
+{
+ struct ab5500_btemp *di = platform_get_drvdata(pdev);
+
+ if (di->events.usb_conn)
+ ab5500_btemp_periodic(di, true);
+
+ return 0;
+}
+
+static int ab5500_btemp_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct ab5500_btemp *di = platform_get_drvdata(pdev);
+
+ if (di->events.usb_conn)
+ ab5500_btemp_periodic(di, false);
+
+ return 0;
+}
+#else
+#define ab5500_btemp_suspend NULL
+#define ab5500_btemp_resume NULL
+#endif
+
+static int __devexit ab5500_btemp_remove(struct platform_device *pdev)
+{
+ struct ab5500_btemp *di = platform_get_drvdata(pdev);
+ int i, irq;
+
+ /* Disable interrupts */
+ for (i = 0; i < ARRAY_SIZE(ab5500_btemp_irq); i++) {
+ irq = platform_get_irq_byname(pdev, ab5500_btemp_irq[i].name);
+ free_irq(irq, di);
+ }
+
+ /* Delete the work queue */
+ destroy_workqueue(di->btemp_wq);
+
+ flush_scheduled_work();
+ power_supply_unregister(&di->btemp_psy);
+ platform_set_drvdata(pdev, NULL);
+ kfree(di->gpadc_auto);
+ kfree(di);
+
+ return 0;
+}
+
+static int __devinit ab5500_btemp_probe(struct platform_device *pdev)
+{
+ int irq, i, ret = 0;
+ struct abx500_bm_plat_data *plat_data;
+
+ struct ab5500_btemp *di =
+ kzalloc(sizeof(struct ab5500_btemp), GFP_KERNEL);
+ if (!di)
+ return -ENOMEM;
+
+ /* get parent data */
+ di->dev = &pdev->dev;
+ di->parent = dev_get_drvdata(pdev->dev.parent);
+ di->gpadc = ab5500_gpadc_get("ab5500-adc.0");
+
+ plat_data = pdev->dev.platform_data;
+ di->pdata = plat_data->btemp;
+ di->bat = plat_data->battery;
+
+ /* get btemp specific platform data */
+ if (!di->pdata) {
+ dev_err(di->dev, "no btemp platform data supplied\n");
+ ret = -EINVAL;
+ goto free_device_info;
+ }
+
+ /* get battery specific platform data */
+ if (!di->bat) {
+ dev_err(di->dev, "no battery platform data supplied\n");
+ ret = -EINVAL;
+ goto free_device_info;
+ }
+
+ /* BTEMP supply */
+ di->btemp_psy.name = "ab5500_btemp";
+ di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
+ di->btemp_psy.properties = ab5500_btemp_props;
+ di->btemp_psy.num_properties = ARRAY_SIZE(ab5500_btemp_props);
+ di->btemp_psy.get_property = ab5500_btemp_get_property;
+ di->btemp_psy.supplied_to = di->pdata->supplied_to;
+ di->btemp_psy.num_supplicants = di->pdata->num_supplicants;
+ di->btemp_psy.external_power_changed =
+ ab5500_btemp_external_power_changed;
+
+
+ /* Create a work queue for the btemp */
+ di->btemp_wq =
+ create_singlethread_workqueue("ab5500_btemp_wq");
+ if (di->btemp_wq == NULL) {
+ dev_err(di->dev, "failed to create work queue\n");
+ goto free_device_info;
+ }
+
+ /* Init work for measuring temperature periodically */
+ INIT_DELAYED_WORK_DEFERRABLE(&di->btemp_periodic_work,
+ ab5500_btemp_periodic_work);
+
+ /* Get Chip ID of the ABB ASIC */
+ ret = abx500_get_chip_id(di->dev);
+ if (ret < 0) {
+ dev_err(di->dev, "failed to get chip ID\n");
+ goto free_btemp_wq;
+ }
+ di->chip_id = ret;
+ dev_dbg(di->dev, "ab5500 CID is: 0x%02x\n",
+ di->chip_id);
+
+ /* Identify the battery */
+ if (ab5500_btemp_id(di) < 0)
+ dev_warn(di->dev, "failed to identify the battery\n");
+
+ /* Measure temperature once initially */
+ di->bat_temp = ab5500_btemp_measure_temp(di);
+ di->bat->temp_now = di->bat_temp;
+
+ /* Register BTEMP power supply class */
+ ret = power_supply_register(di->dev, &di->btemp_psy);
+ if (ret) {
+ dev_err(di->dev, "failed to register BTEMP psy\n");
+ goto free_btemp_wq;
+ }
+
+ /* Register interrupts */
+ for (i = 0; i < ARRAY_SIZE(ab5500_btemp_irq); i++) {
+ irq = platform_get_irq_byname(pdev, ab5500_btemp_irq[i].name);
+ ret = request_threaded_irq(irq, NULL, ab5500_btemp_irq[i].isr,
+ IRQF_SHARED | IRQF_NO_SUSPEND,
+ ab5500_btemp_irq[i].name, di);
+
+ if (ret) {
+ dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
+ , ab5500_btemp_irq[i].name, irq, ret);
+ goto free_irq;
+ }
+ dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
+ ab5500_btemp_irq[i].name, irq, ret);
+ }
+ ret = ab5500_btemp_auto_temp(di);
+ if (ret) {
+ dev_err(di->dev,
+ "failed to register auto trigger for battery temp\n");
+ goto free_irq;
+ }
+
+ platform_set_drvdata(pdev, di);
+
+ dev_info(di->dev, "probe success\n");
+ return ret;
+
+free_irq:
+ power_supply_unregister(&di->btemp_psy);
+
+ /* We also have to free all successfully registered irqs */
+ for (i = i - 1; i >= 0; i--) {
+ irq = platform_get_irq_byname(pdev, ab5500_btemp_irq[i].name);
+ free_irq(irq, di);
+ }
+free_btemp_wq:
+ destroy_workqueue(di->btemp_wq);
+free_device_info:
+ kfree(di);
+
+ return ret;
+}
+
+static struct platform_driver ab5500_btemp_driver = {
+ .probe = ab5500_btemp_probe,
+ .remove = __devexit_p(ab5500_btemp_remove),
+ .suspend = ab5500_btemp_suspend,
+ .resume = ab5500_btemp_resume,
+ .driver = {
+ .name = "ab5500-btemp",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init ab5500_btemp_init(void)
+{
+ return platform_driver_register(&ab5500_btemp_driver);
+}
+
+static void __exit ab5500_btemp_exit(void)
+{
+ platform_driver_unregister(&ab5500_btemp_driver);
+}
+
+subsys_initcall_sync(ab5500_btemp_init);
+module_exit(ab5500_btemp_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
+MODULE_ALIAS("platform:ab5500-btemp");
+MODULE_DESCRIPTION("AB5500 battery temperature driver");