--- /dev/null
+/*
+ * TI LP8788 MFD - battery charger driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/iio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+/* register address */
+#define LP8788_CHG_STATUS 0x07
+#define LP8788_CHG_IDCIN 0x13
+#define LP8788_CHG_IBATT 0x14
+#define LP8788_CHG_VTERM 0x15
+#define LP8788_CHG_EOC 0x16
+
+/* mask/shift bits */
+#define LP8788_CHG_INPUT_STATE_M 0x03 /* Addr 07h */
+#define LP8788_CHG_STATE_M 0x3C
+#define LP8788_CHG_STATE_S 2
+#define LP8788_NO_BATT_M BIT(6)
+#define LP8788_BAD_BATT_M BIT(7)
+#define LP8788_CHG_IBATT_M 0x1F /* Addr 14h */
+#define LP8788_CHG_VTERM_M 0x0F /* Addr 15h */
+#define LP8788_CHG_EOC_LEVEL_M 0x30 /* Addr 16h */
+#define LP8788_CHG_EOC_LEVEL_S 4
+#define LP8788_CHG_EOC_TIME_M 0x0E
+#define LP8788_CHG_EOC_TIME_S 1
+#define LP8788_CHG_EOC_MODE_M BIT(0)
+
+#define LP8788_CHARGER_NAME "charger"
+#define LP8788_BATTERY_NAME "main_batt"
+
+#define LP8788_CHG_START 0x11
+#define LP8788_CHG_END 0x1C
+
+#define LP8788_BUF_SIZE 40
+#define LP8788_ISEL_MAX 23
+#define LP8788_ISEL_STEP 50
+#define LP8788_VTERM_MIN 4100
+#define LP8788_VTERM_STEP 25
+#define LP8788_MAX_BATT_CAPACITY 100
+#define LP8788_MAX_CHG_IRQS 11
+
+enum lp8788_charging_state {
+ LP8788_OFF,
+ LP8788_WARM_UP,
+ LP8788_LOW_INPUT = 0x3,
+ LP8788_PRECHARGE,
+ LP8788_CC,
+ LP8788_CV,
+ LP8788_MAINTENANCE,
+ LP8788_BATTERY_FAULT,
+ LP8788_SYSTEM_SUPPORT = 0xC,
+ LP8788_HIGH_CURRENT = 0xF,
+ LP8788_MAX_CHG_STATE,
+};
+
+enum lp8788_charger_adc_sel {
+ LP8788_VBATT,
+ LP8788_BATT_TEMP,
+ LP8788_NUM_CHG_ADC,
+};
+
+enum lp8788_charger_input_state {
+ LP8788_SYSTEM_SUPPLY = 1,
+ LP8788_FULL_FUNCTION,
+};
+
+/*
+ * struct lp8788_chg_irq
+ * @which : lp8788 interrupt id
+ * @virq : Linux IRQ number from irq_domain
+ */
+struct lp8788_chg_irq {
+ enum lp8788_int_id which;
+ int virq;
+};
+
+/*
+ * struct lp8788_charger
+ * @lp : used for accessing the registers of mfd lp8788 device
+ * @charger : power supply driver for the battery charger
+ * @battery : power supply driver for the battery
+ * @charger_work : work queue for charger input interrupts
+ * @chan : iio channels for getting adc values
+ * eg) battery voltage, capacity and temperature
+ * @irqs : charger dedicated interrupts
+ * @num_irqs : total numbers of charger interrupts
+ * @pdata : charger platform specific data
+ */
+struct lp8788_charger {
+ struct lp8788 *lp;
+ struct power_supply charger;
+ struct power_supply battery;
+ struct work_struct charger_work;
+ struct iio_channel *chan[LP8788_NUM_CHG_ADC];
+ struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
+ int num_irqs;
+ struct lp8788_charger_platform_data *pdata;
+};
+
+static char *battery_supplied_to[] = {
+ LP8788_BATTERY_NAME,
+};
+
+static enum power_supply_property lp8788_charger_prop[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
+};
+
+static enum power_supply_property lp8788_battery_prop[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_TEMP,
+};
+
+static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
+{
+ u8 data;
+
+ lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+ data &= LP8788_CHG_INPUT_STATE_M;
+
+ return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
+}
+
+static int lp8788_charger_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
+ u8 read;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = lp8788_is_charger_detected(pchg);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
+ val->intval = LP8788_ISEL_STEP *
+ (min_t(int, read, LP8788_ISEL_MAX) + 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int lp8788_get_battery_status(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ enum lp8788_charging_state state;
+ u8 data;
+ int ret;
+
+ ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+ if (ret)
+ return ret;
+
+ state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
+ switch (state) {
+ case LP8788_OFF:
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case LP8788_PRECHARGE:
+ case LP8788_CC:
+ case LP8788_CV:
+ case LP8788_HIGH_CURRENT:
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case LP8788_MAINTENANCE:
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ break;
+ default:
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+
+ return 0;
+}
+
+static int lp8788_get_battery_health(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ u8 data;
+ int ret;
+
+ ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+ if (ret)
+ return ret;
+
+ if (data & LP8788_NO_BATT_M)
+ val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ else if (data & LP8788_BAD_BATT_M)
+ val->intval = POWER_SUPPLY_HEALTH_DEAD;
+ else
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+
+ return 0;
+}
+
+static int lp8788_get_battery_present(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ u8 data;
+ int ret;
+
+ ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+ if (ret)
+ return ret;
+
+ val->intval = !(data & LP8788_NO_BATT_M);
+ return 0;
+}
+
+static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg,
+ unsigned int *result)
+{
+ struct iio_channel *channel = pchg->chan[LP8788_VBATT];
+ int scaleint;
+ int scalepart;
+ int ret;
+
+ if (!channel)
+ return -EINVAL;
+
+ ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
+ if (ret != IIO_VAL_INT_PLUS_MICRO)
+ return -EINVAL;
+
+ /* unit: mV */
+ *result = (scaleint + scalepart * 1000000) / 1000;
+
+ return 0;
+}
+
+static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ return lp8788_get_vbatt_adc(pchg, &val->intval);
+}
+
+static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ struct lp8788 *lp = pchg->lp;
+ struct lp8788_charger_platform_data *pdata = pchg->pdata;
+ unsigned int max_vbatt;
+ unsigned int vbatt;
+ enum lp8788_charging_state state;
+ u8 data;
+ int ret;
+
+ if (!pdata)
+ return -EINVAL;
+
+ max_vbatt = pdata->max_vbatt_mv;
+ if (max_vbatt == 0)
+ return -EINVAL;
+
+ ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
+ if (ret)
+ return ret;
+
+ state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
+
+ if (state == LP8788_MAINTENANCE) {
+ val->intval = LP8788_MAX_BATT_CAPACITY;
+ } else {
+ ret = lp8788_get_vbatt_adc(pchg, &vbatt);
+ if (ret)
+ return ret;
+
+ val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
+ val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
+ }
+
+ return 0;
+}
+
+static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
+ int scaleint;
+ int scalepart;
+ int ret;
+
+ if (!channel)
+ return -EINVAL;
+
+ ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
+ if (ret != IIO_VAL_INT_PLUS_MICRO)
+ return -EINVAL;
+
+ /* unit: 0.1 'C */
+ val->intval = (scaleint + scalepart * 1000000) / 100;
+
+ return 0;
+}
+
+static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ u8 read;
+
+ lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
+ read &= LP8788_CHG_IBATT_M;
+ val->intval = LP8788_ISEL_STEP *
+ (min_t(int, read, LP8788_ISEL_MAX) + 1);
+
+ return 0;
+}
+
+static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
+ union power_supply_propval *val)
+{
+ u8 read;
+
+ lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
+ read &= LP8788_CHG_VTERM_M;
+ val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
+
+ return 0;
+}
+
+static int lp8788_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ return lp8788_get_battery_status(pchg, val);
+ case POWER_SUPPLY_PROP_HEALTH:
+ return lp8788_get_battery_health(pchg, val);
+ case POWER_SUPPLY_PROP_PRESENT:
+ return lp8788_get_battery_present(pchg, val);
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ return lp8788_get_battery_voltage(pchg, val);
+ case POWER_SUPPLY_PROP_CAPACITY:
+ return lp8788_get_battery_capacity(pchg, val);
+ case POWER_SUPPLY_PROP_TEMP:
+ return lp8788_get_battery_temperature(pchg, val);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ return lp8788_get_battery_charging_current(pchg, val);
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ return lp8788_get_charging_termination_voltage(pchg, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static inline bool lp8788_is_valid_charger_register(u8 addr)
+{
+ return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
+}
+
+static int lp8788_update_charger_params(struct lp8788_charger *pchg)
+{
+ struct lp8788 *lp = pchg->lp;
+ struct lp8788_charger_platform_data *pdata = pchg->pdata;
+ struct lp8788_chg_param *param;
+ int i;
+ int ret;
+
+ if (!pdata || !pdata->chg_params) {
+ dev_info(lp->dev, "skip updating charger parameters\n");
+ return 0;
+ }
+
+ /* settting charging parameters */
+ for (i = 0; i < pdata->num_chg_params; i++) {
+ param = pdata->chg_params + i;
+
+ if (!param)
+ continue;
+
+ if (lp8788_is_valid_charger_register(param->addr)) {
+ ret = lp8788_write_byte(lp, param->addr, param->val);
+ if (ret)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int lp8788_psy_register(struct platform_device *pdev,
+ struct lp8788_charger *pchg)
+{
+ pchg->charger.name = LP8788_CHARGER_NAME;
+ pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
+ pchg->charger.properties = lp8788_charger_prop;
+ pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
+ pchg->charger.get_property = lp8788_charger_get_property;
+ pchg->charger.supplied_to = battery_supplied_to;
+ pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
+
+ if (power_supply_register(&pdev->dev, &pchg->charger))
+ return -EPERM;
+
+ pchg->battery.name = LP8788_BATTERY_NAME;
+ pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+ pchg->battery.properties = lp8788_battery_prop;
+ pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
+ pchg->battery.get_property = lp8788_battery_get_property;
+
+ if (power_supply_register(&pdev->dev, &pchg->battery))
+ return -EPERM;
+
+ return 0;
+}
+
+static void lp8788_psy_unregister(struct lp8788_charger *pchg)
+{
+ power_supply_unregister(&pchg->battery);
+ power_supply_unregister(&pchg->charger);
+}
+
+static void lp8788_charger_event(struct work_struct *work)
+{
+ struct lp8788_charger *pchg =
+ container_of(work, struct lp8788_charger, charger_work);
+ struct lp8788_charger_platform_data *pdata = pchg->pdata;
+ enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
+
+ pdata->charger_event(pchg->lp, event);
+}
+
+static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
+{
+ bool found;
+ int i;
+
+ for (i = 0; i < pchg->num_irqs; i++) {
+ if (pchg->irqs[i].virq == virq) {
+ *id = pchg->irqs[i].which;
+ found = true;
+ break;
+ }
+ }
+
+ return found;
+}
+
+static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
+{
+ struct lp8788_charger *pchg = ptr;
+ struct lp8788_charger_platform_data *pdata = pchg->pdata;
+ int id = -1;
+
+ if (!lp8788_find_irq_id(pchg, virq, &id))
+ return IRQ_NONE;
+
+ switch (id) {
+ case LP8788_INT_CHG_INPUT_STATE:
+ case LP8788_INT_CHG_STATE:
+ case LP8788_INT_EOC:
+ case LP8788_INT_BATT_LOW:
+ case LP8788_INT_NO_BATT:
+ power_supply_changed(&pchg->charger);
+ power_supply_changed(&pchg->battery);
+ break;
+ default:
+ break;
+ }
+
+ /* report charger dectection event if used */
+ if (!pdata)
+ goto irq_handled;
+
+ if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
+ schedule_work(&pchg->charger_work);
+
+irq_handled:
+ return IRQ_HANDLED;
+}
+
+static int lp8788_set_irqs(struct platform_device *pdev,
+ struct lp8788_charger *pchg, const char *name)
+{
+ struct resource *r;
+ struct irq_domain *irqdm = pchg->lp->irqdm;
+ int irq_start;
+ int irq_end;
+ int virq;
+ int nr_irq;
+ int i;
+ int ret;
+
+ /* no error even if no irq resource */
+ r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
+ if (!r)
+ return 0;
+
+ irq_start = r->start;
+ irq_end = r->end;
+
+ for (i = irq_start; i <= irq_end; i++) {
+ nr_irq = pchg->num_irqs;
+
+ virq = irq_create_mapping(irqdm, i);
+ pchg->irqs[nr_irq].virq = virq;
+ pchg->irqs[nr_irq].which = i;
+ pchg->num_irqs++;
+
+ ret = request_threaded_irq(virq, NULL,
+ lp8788_charger_irq_thread,
+ 0, name, pchg);
+ if (ret)
+ break;
+ }
+
+ if (i <= irq_end)
+ goto err_free_irq;
+
+ return 0;
+
+err_free_irq:
+ for (i = 0; i < pchg->num_irqs; i++)
+ free_irq(pchg->irqs[i].virq, pchg);
+ return ret;
+}
+
+static int lp8788_irq_register(struct platform_device *pdev,
+ struct lp8788_charger *pchg)
+{
+ struct lp8788 *lp = pchg->lp;
+ const char *name[] = {
+ LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
+ };
+ int i;
+ int ret;
+
+ INIT_WORK(&pchg->charger_work, lp8788_charger_event);
+ pchg->num_irqs = 0;
+
+ for (i = 0; i < ARRAY_SIZE(name); i++) {
+ ret = lp8788_set_irqs(pdev, pchg, name[i]);
+ if (ret) {
+ dev_warn(lp->dev, "irq setup failed: %s\n", name[i]);
+ return ret;
+ }
+ }
+
+ if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
+ dev_err(lp->dev, "invalid total number of irqs: %d\n",
+ pchg->num_irqs);
+ return -EINVAL;
+ }
+
+
+ return 0;
+}
+
+static void lp8788_irq_unregister(struct platform_device *pdev,
+ struct lp8788_charger *pchg)
+{
+ int i;
+ int irq;
+
+ for (i = 0; i < pchg->num_irqs; i++) {
+ irq = pchg->irqs[i].virq;
+ if (!irq)
+ continue;
+
+ free_irq(irq, pchg);
+ }
+}
+
+static void lp8788_setup_adc_channel(struct lp8788_charger *pchg)
+{
+ struct lp8788_charger_platform_data *pdata = pchg->pdata;
+ struct device *dev = pchg->lp->dev;
+ struct iio_channel *chan;
+ enum lp8788_adc_id id;
+ const char *chan_name[LPADC_MAX] = {
+ [LPADC_VBATT_5P5] = "vbatt-5p5",
+ [LPADC_VBATT_6P0] = "vbatt-6p0",
+ [LPADC_VBATT_5P0] = "vbatt-5p0",
+ [LPADC_ADC1] = "adc1",
+ [LPADC_ADC2] = "adc2",
+ [LPADC_ADC3] = "adc3",
+ [LPADC_ADC4] = "adc4",
+ };
+
+ if (!pdata)
+ return;
+
+ id = pdata->vbatt_adc;
+ switch (id) {
+ case LPADC_VBATT_5P5:
+ case LPADC_VBATT_6P0:
+ case LPADC_VBATT_5P0:
+ chan = iio_channel_get(NULL, chan_name[id]);
+ pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
+ break;
+ default:
+ dev_err(dev, "invalid ADC id for VBATT: %d\n", id);
+ pchg->chan[LP8788_VBATT] = NULL;
+ break;
+ }
+
+ id = pdata->batt_temp_adc;
+ switch (id) {
+ case LPADC_ADC1:
+ case LPADC_ADC2:
+ case LPADC_ADC3:
+ case LPADC_ADC4:
+ chan = iio_channel_get(NULL, chan_name[id]);
+ pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
+ break;
+ default:
+ dev_err(dev, "invalid ADC id for BATT_TEMP : %d\n", id);
+ pchg->chan[LP8788_BATT_TEMP] = NULL;
+ break;
+ }
+}
+
+static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
+{
+ int i;
+
+ for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
+ if (!pchg->chan[i])
+ continue;
+
+ iio_channel_release(pchg->chan[i]);
+ pchg->chan[i] = NULL;
+ }
+}
+
+static ssize_t lp8788_show_charger_status(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct lp8788_charger *pchg = dev_get_drvdata(dev);
+ enum lp8788_charging_state state;
+ char *desc[LP8788_MAX_CHG_STATE] = {
+ [LP8788_OFF] = "CHARGER OFF",
+ [LP8788_WARM_UP] = "WARM UP",
+ [LP8788_LOW_INPUT] = "LOW INPUT STATE",
+ [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
+ [LP8788_CC] = "CHARGING - CC",
+ [LP8788_CV] = "CHARGING - CV",
+ [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
+ [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
+ [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
+ [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
+ };
+ u8 data;
+
+ lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+ state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
+
+ return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
+}
+
+static ssize_t lp8788_show_eoc_time(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct lp8788_charger *pchg = dev_get_drvdata(dev);
+ char *stime[] = { "400ms", "5min", "10min", "15min",
+ "20min", "25min", "30min" "No timeout" };
+ u8 val;
+
+ lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
+ val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
+
+ return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
+ stime[val]);
+}
+
+static ssize_t lp8788_show_eoc_level(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct lp8788_charger *pchg = dev_get_drvdata(dev);
+ char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
+ char *relative_level[] = { "5%", "10%", "15%", "20%" };
+ char *level;
+ u8 val;
+ u8 mode;
+
+ lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
+
+ mode = val & LP8788_CHG_EOC_MODE_M;
+ val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
+ level = mode ? abs_level[val] : relative_level[val];
+
+ return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
+ level);
+}
+
+static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
+static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
+static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
+
+static struct attribute *lp8788_charger_attr[] = {
+ &dev_attr_charger_status.attr,
+ &dev_attr_eoc_time.attr,
+ &dev_attr_eoc_level.attr,
+ NULL,
+};
+
+static const struct attribute_group lp8788_attr_group = {
+ .attrs = lp8788_charger_attr,
+};
+
+static __devinit int lp8788_charger_probe(struct platform_device *pdev)
+{
+ struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
+ struct lp8788_charger *pchg;
+ int ret;
+
+ pchg = devm_kzalloc(lp->dev, sizeof(struct lp8788_charger), GFP_KERNEL);
+ if (!pchg)
+ return -ENOMEM;
+
+ pchg->lp = lp;
+ pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
+ platform_set_drvdata(pdev, pchg);
+
+ ret = lp8788_update_charger_params(pchg);
+ if (ret)
+ return ret;
+
+ lp8788_setup_adc_channel(pchg);
+
+ ret = lp8788_psy_register(pdev, pchg);
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
+ if (ret) {
+ lp8788_psy_unregister(pchg);
+ return ret;
+ }
+
+ ret = lp8788_irq_register(pdev, pchg);
+ if (ret)
+ dev_warn(lp->dev, "failed to register charger irq: %d\n", ret);
+
+ return 0;
+}
+
+static int __devexit lp8788_charger_remove(struct platform_device *pdev)
+{
+ struct lp8788_charger *pchg = platform_get_drvdata(pdev);
+
+ flush_work(&pchg->charger_work);
+ lp8788_irq_unregister(pdev, pchg);
+ sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
+ lp8788_psy_unregister(pchg);
+ lp8788_release_adc_channel(pchg);
+
+ return 0;
+}
+
+static struct platform_driver lp8788_charger_driver = {
+ .probe = lp8788_charger_probe,
+ .remove = __devexit_p(lp8788_charger_remove),
+ .driver = {
+ .name = LP8788_DEV_CHARGER,
+ .owner = THIS_MODULE,
+ },
+};
+module_platform_driver(lp8788_charger_driver);
+
+MODULE_DESCRIPTION("TI LP8788 Charger Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lp8788-charger");
projects / mirror_ubuntu-bionic-kernel.git / commitdiff