--- /dev/null
+/*
+ * Driver for LP8727 Micro/Mini USB IC with integrated charger
+ *
+ * Copyright (C) 2011 Texas Instruments
+ * Copyright (C) 2011 National Semiconductor
+ *
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/power_supply.h>
+#include <linux/platform_data/lp8727.h>
+#include <linux/of.h>
+
+#define LP8788_NUM_INTREGS 2
+#define DEFAULT_DEBOUNCE_MSEC 270
+
+/* Registers */
+#define LP8727_CTRL1 0x1
+#define LP8727_CTRL2 0x2
+#define LP8727_SWCTRL 0x3
+#define LP8727_INT1 0x4
+#define LP8727_INT2 0x5
+#define LP8727_STATUS1 0x6
+#define LP8727_STATUS2 0x7
+#define LP8727_CHGCTRL2 0x9
+
+/* CTRL1 register */
+#define LP8727_CP_EN BIT(0)
+#define LP8727_ADC_EN BIT(1)
+#define LP8727_ID200_EN BIT(4)
+
+/* CTRL2 register */
+#define LP8727_CHGDET_EN BIT(1)
+#define LP8727_INT_EN BIT(6)
+
+/* SWCTRL register */
+#define LP8727_SW_DM1_DM (0x0 << 0)
+#define LP8727_SW_DM1_HiZ (0x7 << 0)
+#define LP8727_SW_DP2_DP (0x0 << 3)
+#define LP8727_SW_DP2_HiZ (0x7 << 3)
+
+/* INT1 register */
+#define LP8727_IDNO (0xF << 0)
+#define LP8727_VBUS BIT(4)
+
+/* STATUS1 register */
+#define LP8727_CHGSTAT (3 << 4)
+#define LP8727_CHPORT BIT(6)
+#define LP8727_DCPORT BIT(7)
+#define LP8727_STAT_EOC 0x30
+
+/* STATUS2 register */
+#define LP8727_TEMP_STAT (3 << 5)
+#define LP8727_TEMP_SHIFT 5
+
+/* CHGCTRL2 register */
+#define LP8727_ICHG_SHIFT 4
+
+enum lp8727_dev_id {
+ LP8727_ID_NONE,
+ LP8727_ID_TA,
+ LP8727_ID_DEDICATED_CHG,
+ LP8727_ID_USB_CHG,
+ LP8727_ID_USB_DS,
+ LP8727_ID_MAX,
+};
+
+enum lp8727_die_temp {
+ LP8788_TEMP_75C,
+ LP8788_TEMP_95C,
+ LP8788_TEMP_115C,
+ LP8788_TEMP_135C,
+};
+
+struct lp8727_psy {
+ struct power_supply *ac;
+ struct power_supply *usb;
+ struct power_supply *batt;
+};
+
+struct lp8727_chg {
+ struct device *dev;
+ struct i2c_client *client;
+ struct mutex xfer_lock;
+ struct lp8727_psy *psy;
+ struct lp8727_platform_data *pdata;
+
+ /* Charger Data */
+ enum lp8727_dev_id devid;
+ struct lp8727_chg_param *chg_param;
+
+ /* Interrupt Handling */
+ int irq;
+ struct delayed_work work;
+ unsigned long debounce_jiffies;
+};
+
+static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
+{
+ s32 ret;
+
+ mutex_lock(&pchg->xfer_lock);
+ ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
+ mutex_unlock(&pchg->xfer_lock);
+
+ return (ret != len) ? -EIO : 0;
+}
+
+static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
+{
+ return lp8727_read_bytes(pchg, reg, data, 1);
+}
+
+static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
+{
+ int ret;
+
+ mutex_lock(&pchg->xfer_lock);
+ ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
+ mutex_unlock(&pchg->xfer_lock);
+
+ return ret;
+}
+
+static bool lp8727_is_charger_attached(const char *name, int id)
+{
+ if (!strcmp(name, "ac"))
+ return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG;
+ else if (!strcmp(name, "usb"))
+ return id == LP8727_ID_USB_CHG;
+
+ return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
+}
+
+static int lp8727_init_device(struct lp8727_chg *pchg)
+{
+ u8 val;
+ int ret;
+ u8 intstat[LP8788_NUM_INTREGS];
+
+ /* clear interrupts */
+ ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
+ if (ret)
+ return ret;
+
+ val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN;
+ ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
+ if (ret)
+ return ret;
+
+ val = LP8727_INT_EN | LP8727_CHGDET_EN;
+ return lp8727_write_byte(pchg, LP8727_CTRL2, val);
+}
+
+static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
+{
+ u8 val;
+
+ lp8727_read_byte(pchg, LP8727_STATUS1, &val);
+ return val & LP8727_DCPORT;
+}
+
+static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
+{
+ u8 val;
+
+ lp8727_read_byte(pchg, LP8727_STATUS1, &val);
+ return val & LP8727_CHPORT;
+}
+
+static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
+{
+ lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
+}
+
+static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
+{
+ struct lp8727_platform_data *pdata = pchg->pdata;
+ u8 devid = LP8727_ID_NONE;
+ u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;
+
+ switch (id) {
+ case 0x5:
+ devid = LP8727_ID_TA;
+ pchg->chg_param = pdata ? pdata->ac : NULL;
+ break;
+ case 0xB:
+ if (lp8727_is_dedicated_charger(pchg)) {
+ pchg->chg_param = pdata ? pdata->ac : NULL;
+ devid = LP8727_ID_DEDICATED_CHG;
+ } else if (lp8727_is_usb_charger(pchg)) {
+ pchg->chg_param = pdata ? pdata->usb : NULL;
+ devid = LP8727_ID_USB_CHG;
+ swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
+ } else if (vbusin) {
+ devid = LP8727_ID_USB_DS;
+ swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
+ }
+ break;
+ default:
+ devid = LP8727_ID_NONE;
+ pchg->chg_param = NULL;
+ break;
+ }
+
+ pchg->devid = devid;
+ lp8727_ctrl_switch(pchg, swctrl);
+}
+
+static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
+{
+ u8 val;
+
+ lp8727_read_byte(pchg, LP8727_CTRL2, &val);
+ val |= LP8727_CHGDET_EN;
+ lp8727_write_byte(pchg, LP8727_CTRL2, val);
+}
+
+static void lp8727_delayed_func(struct work_struct *_work)
+{
+ struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
+ work.work);
+ u8 intstat[LP8788_NUM_INTREGS];
+ u8 idno;
+ u8 vbus;
+
+ if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
+ dev_err(pchg->dev, "can not read INT registers\n");
+ return;
+ }
+
+ idno = intstat[0] & LP8727_IDNO;
+ vbus = intstat[0] & LP8727_VBUS;
+
+ lp8727_id_detection(pchg, idno, vbus);
+ lp8727_enable_chgdet(pchg);
+
+ power_supply_changed(pchg->psy->ac);
+ power_supply_changed(pchg->psy->usb);
+ power_supply_changed(pchg->psy->batt);
+}
+
+static irqreturn_t lp8727_isr_func(int irq, void *ptr)
+{
+ struct lp8727_chg *pchg = ptr;
+
+ schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
+ return IRQ_HANDLED;
+}
+
+static int lp8727_setup_irq(struct lp8727_chg *pchg)
+{
+ int ret;
+ int irq = pchg->client->irq;
+ unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
+ DEFAULT_DEBOUNCE_MSEC;
+
+ INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
+
+ if (irq <= 0) {
+ dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
+ return 0;
+ }
+
+ ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "lp8727_irq", pchg);
+
+ if (ret)
+ return ret;
+
+ pchg->irq = irq;
+ pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
+
+ return 0;
+}
+
+static void lp8727_release_irq(struct lp8727_chg *pchg)
+{
+ cancel_delayed_work_sync(&pchg->work);
+
+ if (pchg->irq)
+ free_irq(pchg->irq, pchg);
+}
+
+static enum power_supply_property lp8727_charger_prop[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static enum power_supply_property lp8727_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_TEMP,
+};
+
+static char *battery_supplied_to[] = {
+ "main_batt",
+};
+
+static int lp8727_charger_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
+
+ if (psp != POWER_SUPPLY_PROP_ONLINE)
+ return -EINVAL;
+
+ val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid);
+
+ return 0;
+}
+
+static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
+{
+ switch (temp) {
+ case LP8788_TEMP_95C:
+ case LP8788_TEMP_115C:
+ case LP8788_TEMP_135C:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static int lp8727_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
+ struct lp8727_platform_data *pdata = pchg->pdata;
+ enum lp8727_die_temp temp;
+ u8 read;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) {
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ return 0;
+ }
+
+ lp8727_read_byte(pchg, LP8727_STATUS1, &read);
+
+ val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
+ POWER_SUPPLY_STATUS_FULL :
+ POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ lp8727_read_byte(pchg, LP8727_STATUS2, &read);
+ temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
+
+ val->intval = lp8727_is_high_temperature(temp) ?
+ POWER_SUPPLY_HEALTH_OVERHEAT :
+ POWER_SUPPLY_HEALTH_GOOD;
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_present)
+ val->intval = pdata->get_batt_present();
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_level)
+ val->intval = pdata->get_batt_level();
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_capacity)
+ val->intval = pdata->get_batt_capacity();
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->get_batt_temp)
+ val->intval = pdata->get_batt_temp();
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static void lp8727_charger_changed(struct power_supply *psy)
+{
+ struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
+ u8 eoc_level;
+ u8 ichg;
+ u8 val;
+
+ /* skip if no charger exists */
+ if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
+ return;
+
+ /* update charging parameters */
+ if (pchg->chg_param) {
+ eoc_level = pchg->chg_param->eoc_level;
+ ichg = pchg->chg_param->ichg;
+ val = (ichg << LP8727_ICHG_SHIFT) | eoc_level;
+ lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
+ }
+}
+
+static const struct power_supply_desc lp8727_ac_desc = {
+ .name = "ac",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .properties = lp8727_charger_prop,
+ .num_properties = ARRAY_SIZE(lp8727_charger_prop),
+ .get_property = lp8727_charger_get_property,
+};
+
+static const struct power_supply_desc lp8727_usb_desc = {
+ .name = "usb",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .properties = lp8727_charger_prop,
+ .num_properties = ARRAY_SIZE(lp8727_charger_prop),
+ .get_property = lp8727_charger_get_property,
+};
+
+static const struct power_supply_desc lp8727_batt_desc = {
+ .name = "main_batt",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = lp8727_battery_prop,
+ .num_properties = ARRAY_SIZE(lp8727_battery_prop),
+ .get_property = lp8727_battery_get_property,
+ .external_power_changed = lp8727_charger_changed,
+};
+
+static int lp8727_register_psy(struct lp8727_chg *pchg)
+{
+ struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
+ struct lp8727_psy *psy;
+
+ psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
+ if (!psy)
+ return -ENOMEM;
+
+ pchg->psy = psy;
+
+ psy_cfg.supplied_to = battery_supplied_to;
+ psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
+
+ psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
+ if (IS_ERR(psy->ac))
+ goto err_psy_ac;
+
+ psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
+ &psy_cfg);
+ if (IS_ERR(psy->usb))
+ goto err_psy_usb;
+
+ psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
+ if (IS_ERR(psy->batt))
+ goto err_psy_batt;
+
+ return 0;
+
+err_psy_batt:
+ power_supply_unregister(psy->usb);
+err_psy_usb:
+ power_supply_unregister(psy->ac);
+err_psy_ac:
+ return -EPERM;
+}
+
+static void lp8727_unregister_psy(struct lp8727_chg *pchg)
+{
+ struct lp8727_psy *psy = pchg->psy;
+
+ if (!psy)
+ return;
+
+ power_supply_unregister(psy->ac);
+ power_supply_unregister(psy->usb);
+ power_supply_unregister(psy->batt);
+}
+
+#ifdef CONFIG_OF
+static struct lp8727_chg_param
+*lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
+{
+ struct lp8727_chg_param *param;
+
+ param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
+ if (!param)
+ goto out;
+
+ of_property_read_u8(np, "eoc-level", (u8 *)¶m->eoc_level);
+ of_property_read_u8(np, "charging-current", (u8 *)¶m->ichg);
+out:
+ return param;
+}
+
+static int lp8727_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *child;
+ struct lp8727_platform_data *pdata;
+ const char *type;
+
+ /* If charging parameter is not defined, just skip parsing the dt */
+ if (of_get_child_count(np) == 0)
+ goto out;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
+
+ for_each_child_of_node(np, child) {
+ of_property_read_string(child, "charger-type", &type);
+
+ if (!strcmp(type, "ac"))
+ pdata->ac = lp8727_parse_charge_pdata(dev, child);
+
+ if (!strcmp(type, "usb"))
+ pdata->usb = lp8727_parse_charge_pdata(dev, child);
+ }
+
+ dev->platform_data = pdata;
+out:
+ return 0;
+}
+#else
+static int lp8727_parse_dt(struct device *dev)
+{
+ return 0;
+}
+#endif
+
+static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
+{
+ struct lp8727_chg *pchg;
+ int ret;
+
+ if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
+ return -EIO;
+
+ if (cl->dev.of_node) {
+ ret = lp8727_parse_dt(&cl->dev);
+ if (ret)
+ return ret;
+ }
+
+ pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
+ if (!pchg)
+ return -ENOMEM;
+
+ pchg->client = cl;
+ pchg->dev = &cl->dev;
+ pchg->pdata = cl->dev.platform_data;
+ i2c_set_clientdata(cl, pchg);
+
+ mutex_init(&pchg->xfer_lock);
+
+ ret = lp8727_init_device(pchg);
+ if (ret) {
+ dev_err(pchg->dev, "i2c communication err: %d", ret);
+ return ret;
+ }
+
+ ret = lp8727_register_psy(pchg);
+ if (ret) {
+ dev_err(pchg->dev, "power supplies register err: %d", ret);
+ return ret;
+ }
+
+ ret = lp8727_setup_irq(pchg);
+ if (ret) {
+ dev_err(pchg->dev, "irq handler err: %d", ret);
+ lp8727_unregister_psy(pchg);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int lp8727_remove(struct i2c_client *cl)
+{
+ struct lp8727_chg *pchg = i2c_get_clientdata(cl);
+
+ lp8727_release_irq(pchg);
+ lp8727_unregister_psy(pchg);
+ return 0;
+}
+
+static const struct of_device_id lp8727_dt_ids[] = {
+ { .compatible = "ti,lp8727", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
+
+static const struct i2c_device_id lp8727_ids[] = {
+ {"lp8727", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lp8727_ids);
+
+static struct i2c_driver lp8727_driver = {
+ .driver = {
+ .name = "lp8727",
+ .of_match_table = of_match_ptr(lp8727_dt_ids),
+ },
+ .probe = lp8727_probe,
+ .remove = lp8727_remove,
+ .id_table = lp8727_ids,
+};
+module_i2c_driver(lp8727_driver);
+
+MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff