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path: root/drivers/power/supply/bq24735-charger.c
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Diffstat (limited to 'drivers/power/supply/bq24735-charger.c')
-rw-r--r--drivers/power/supply/bq24735-charger.c516
1 files changed, 516 insertions, 0 deletions
diff --git a/drivers/power/supply/bq24735-charger.c b/drivers/power/supply/bq24735-charger.c
new file mode 100644
index 0000000000..8efceeae86
--- /dev/null
+++ b/drivers/power/supply/bq24735-charger.c
@@ -0,0 +1,516 @@
+/*
+ * Battery charger driver for TI BQ24735
+ *
+ * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/devm-helpers.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/gpio/consumer.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+
+#include <linux/power/bq24735-charger.h>
+
+/* BQ24735 available commands and their respective masks */
+#define BQ24735_CHARGE_OPT 0x12
+#define BQ24735_CHARGE_CURRENT 0x14
+#define BQ24735_CHARGE_CURRENT_MASK 0x1fc0
+#define BQ24735_CHARGE_VOLTAGE 0x15
+#define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff0
+#define BQ24735_INPUT_CURRENT 0x3f
+#define BQ24735_INPUT_CURRENT_MASK 0x1f80
+#define BQ24735_MANUFACTURER_ID 0xfe
+#define BQ24735_DEVICE_ID 0xff
+
+/* ChargeOptions bits of interest */
+#define BQ24735_CHARGE_OPT_CHG_DISABLE (1 << 0)
+#define BQ24735_CHARGE_OPT_AC_PRESENT (1 << 4)
+
+struct bq24735 {
+ struct power_supply *charger;
+ struct power_supply_desc charger_desc;
+ struct i2c_client *client;
+ struct bq24735_platform *pdata;
+ struct mutex lock;
+ struct gpio_desc *status_gpio;
+ struct delayed_work poll;
+ u32 poll_interval;
+ bool charging;
+};
+
+static inline struct bq24735 *to_bq24735(struct power_supply *psy)
+{
+ return power_supply_get_drvdata(psy);
+}
+
+static enum power_supply_property bq24735_charger_properties[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int bq24735_charger_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ return 1;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
+ u16 value)
+{
+ return i2c_smbus_write_word_data(client, reg, value);
+}
+
+static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
+{
+ return i2c_smbus_read_word_data(client, reg);
+}
+
+static int bq24735_update_word(struct i2c_client *client, u8 reg,
+ u16 mask, u16 value)
+{
+ unsigned int tmp;
+ int ret;
+
+ ret = bq24735_read_word(client, reg);
+ if (ret < 0)
+ return ret;
+
+ tmp = ret & ~mask;
+ tmp |= value & mask;
+
+ return bq24735_write_word(client, reg, tmp);
+}
+
+static int bq24735_config_charger(struct bq24735 *charger)
+{
+ struct bq24735_platform *pdata = charger->pdata;
+ int ret;
+ u16 value;
+
+ if (pdata->ext_control)
+ return 0;
+
+ if (pdata->charge_current) {
+ value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
+
+ ret = bq24735_write_word(charger->client,
+ BQ24735_CHARGE_CURRENT, value);
+ if (ret < 0) {
+ dev_err(&charger->client->dev,
+ "Failed to write charger current : %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ if (pdata->charge_voltage) {
+ value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
+
+ ret = bq24735_write_word(charger->client,
+ BQ24735_CHARGE_VOLTAGE, value);
+ if (ret < 0) {
+ dev_err(&charger->client->dev,
+ "Failed to write charger voltage : %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ if (pdata->input_current) {
+ value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
+
+ ret = bq24735_write_word(charger->client,
+ BQ24735_INPUT_CURRENT, value);
+ if (ret < 0) {
+ dev_err(&charger->client->dev,
+ "Failed to write input current : %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static inline int bq24735_enable_charging(struct bq24735 *charger)
+{
+ int ret;
+
+ if (charger->pdata->ext_control)
+ return 0;
+
+ ret = bq24735_config_charger(charger);
+ if (ret)
+ return ret;
+
+ return bq24735_update_word(charger->client, BQ24735_CHARGE_OPT,
+ BQ24735_CHARGE_OPT_CHG_DISABLE, 0);
+}
+
+static inline int bq24735_disable_charging(struct bq24735 *charger)
+{
+ if (charger->pdata->ext_control)
+ return 0;
+
+ return bq24735_update_word(charger->client, BQ24735_CHARGE_OPT,
+ BQ24735_CHARGE_OPT_CHG_DISABLE,
+ BQ24735_CHARGE_OPT_CHG_DISABLE);
+}
+
+static bool bq24735_charger_is_present(struct bq24735 *charger)
+{
+ if (charger->status_gpio) {
+ return !gpiod_get_value_cansleep(charger->status_gpio);
+ } else {
+ int ac = 0;
+
+ ac = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT);
+ if (ac < 0) {
+ dev_dbg(&charger->client->dev,
+ "Failed to read charger options : %d\n",
+ ac);
+ return false;
+ }
+ return (ac & BQ24735_CHARGE_OPT_AC_PRESENT) ? true : false;
+ }
+
+ return false;
+}
+
+static int bq24735_charger_is_charging(struct bq24735 *charger)
+{
+ int ret;
+
+ if (!bq24735_charger_is_present(charger))
+ return 0;
+
+ ret = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT);
+ if (ret < 0)
+ return ret;
+
+ return !(ret & BQ24735_CHARGE_OPT_CHG_DISABLE);
+}
+
+static void bq24735_update(struct bq24735 *charger)
+{
+ mutex_lock(&charger->lock);
+
+ if (charger->charging && bq24735_charger_is_present(charger))
+ bq24735_enable_charging(charger);
+ else
+ bq24735_disable_charging(charger);
+
+ mutex_unlock(&charger->lock);
+
+ power_supply_changed(charger->charger);
+}
+
+static irqreturn_t bq24735_charger_isr(int irq, void *devid)
+{
+ struct power_supply *psy = devid;
+ struct bq24735 *charger = to_bq24735(psy);
+
+ bq24735_update(charger);
+
+ return IRQ_HANDLED;
+}
+
+static void bq24735_poll(struct work_struct *work)
+{
+ struct bq24735 *charger = container_of(work, struct bq24735, poll.work);
+
+ bq24735_update(charger);
+
+ schedule_delayed_work(&charger->poll,
+ msecs_to_jiffies(charger->poll_interval));
+}
+
+static int bq24735_charger_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct bq24735 *charger = to_bq24735(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ switch (bq24735_charger_is_charging(charger)) {
+ case 1:
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case 0:
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ default:
+ val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+ break;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int bq24735_charger_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct bq24735 *charger = to_bq24735(psy);
+ int ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ switch (val->intval) {
+ case POWER_SUPPLY_STATUS_CHARGING:
+ mutex_lock(&charger->lock);
+ charger->charging = true;
+ ret = bq24735_enable_charging(charger);
+ mutex_unlock(&charger->lock);
+ if (ret)
+ return ret;
+ break;
+ case POWER_SUPPLY_STATUS_DISCHARGING:
+ case POWER_SUPPLY_STATUS_NOT_CHARGING:
+ mutex_lock(&charger->lock);
+ charger->charging = false;
+ ret = bq24735_disable_charging(charger);
+ mutex_unlock(&charger->lock);
+ if (ret)
+ return ret;
+ break;
+ default:
+ return -EINVAL;
+ }
+ power_supply_changed(psy);
+ break;
+ default:
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
+{
+ struct bq24735_platform *pdata;
+ struct device_node *np = client->dev.of_node;
+ u32 val;
+ int ret;
+
+ pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(&client->dev,
+ "Memory alloc for bq24735 pdata failed\n");
+ return NULL;
+ }
+
+ ret = of_property_read_u32(np, "ti,charge-current", &val);
+ if (!ret)
+ pdata->charge_current = val;
+
+ ret = of_property_read_u32(np, "ti,charge-voltage", &val);
+ if (!ret)
+ pdata->charge_voltage = val;
+
+ ret = of_property_read_u32(np, "ti,input-current", &val);
+ if (!ret)
+ pdata->input_current = val;
+
+ pdata->ext_control = of_property_read_bool(np, "ti,external-control");
+
+ return pdata;
+}
+
+static int bq24735_charger_probe(struct i2c_client *client)
+{
+ int ret;
+ struct bq24735 *charger;
+ struct power_supply_desc *supply_desc;
+ struct power_supply_config psy_cfg = {};
+ char *name;
+
+ charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ mutex_init(&charger->lock);
+ charger->charging = true;
+ charger->pdata = client->dev.platform_data;
+
+ if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
+ charger->pdata = bq24735_parse_dt_data(client);
+
+ if (!charger->pdata) {
+ dev_err(&client->dev, "no platform data provided\n");
+ return -EINVAL;
+ }
+
+ name = (char *)charger->pdata->name;
+ if (!name) {
+ name = devm_kasprintf(&client->dev, GFP_KERNEL,
+ "bq24735@%s",
+ dev_name(&client->dev));
+ if (!name) {
+ dev_err(&client->dev, "Failed to alloc device name\n");
+ return -ENOMEM;
+ }
+ }
+
+ charger->client = client;
+
+ supply_desc = &charger->charger_desc;
+
+ supply_desc->name = name;
+ supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
+ supply_desc->properties = bq24735_charger_properties;
+ supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
+ supply_desc->get_property = bq24735_charger_get_property;
+ supply_desc->set_property = bq24735_charger_set_property;
+ supply_desc->property_is_writeable =
+ bq24735_charger_property_is_writeable;
+
+ psy_cfg.supplied_to = charger->pdata->supplied_to;
+ psy_cfg.num_supplicants = charger->pdata->num_supplicants;
+ psy_cfg.of_node = client->dev.of_node;
+ psy_cfg.drv_data = charger;
+
+ i2c_set_clientdata(client, charger);
+
+ charger->status_gpio = devm_gpiod_get_optional(&client->dev,
+ "ti,ac-detect",
+ GPIOD_IN);
+ if (IS_ERR(charger->status_gpio)) {
+ ret = PTR_ERR(charger->status_gpio);
+ dev_err(&client->dev, "Getting gpio failed: %d\n", ret);
+ return ret;
+ }
+
+ if (bq24735_charger_is_present(charger)) {
+ ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
+ ret);
+ return ret;
+ } else if (ret != 0x0040) {
+ dev_err(&client->dev,
+ "manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
+ return -ENODEV;
+ }
+
+ ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read device id : %d\n", ret);
+ return ret;
+ } else if (ret != 0x000B) {
+ dev_err(&client->dev,
+ "device id mismatch. 0x000b != 0x%04x\n", ret);
+ return -ENODEV;
+ }
+
+ ret = bq24735_enable_charging(charger);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to enable charging\n");
+ return ret;
+ }
+ }
+
+ charger->charger = devm_power_supply_register(&client->dev, supply_desc,
+ &psy_cfg);
+ if (IS_ERR(charger->charger)) {
+ ret = PTR_ERR(charger->charger);
+ dev_err(&client->dev, "Failed to register power supply: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (client->irq) {
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, bq24735_charger_isr,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ supply_desc->name,
+ charger->charger);
+ if (ret) {
+ dev_err(&client->dev,
+ "Unable to register IRQ %d err %d\n",
+ client->irq, ret);
+ return ret;
+ }
+ } else {
+ ret = device_property_read_u32(&client->dev, "poll-interval",
+ &charger->poll_interval);
+ if (ret)
+ return 0;
+ if (!charger->poll_interval)
+ return 0;
+
+ ret = devm_delayed_work_autocancel(&client->dev, &charger->poll,
+ bq24735_poll);
+ if (ret)
+ return ret;
+
+ schedule_delayed_work(&charger->poll,
+ msecs_to_jiffies(charger->poll_interval));
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id bq24735_charger_id[] = {
+ { "bq24735-charger", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
+
+static const struct of_device_id bq24735_match_ids[] = {
+ { .compatible = "ti,bq24735", },
+ { /* end */ }
+};
+MODULE_DEVICE_TABLE(of, bq24735_match_ids);
+
+static struct i2c_driver bq24735_charger_driver = {
+ .driver = {
+ .name = "bq24735-charger",
+ .of_match_table = bq24735_match_ids,
+ },
+ .probe = bq24735_charger_probe,
+ .id_table = bq24735_charger_id,
+};
+
+module_i2c_driver(bq24735_charger_driver);
+
+MODULE_DESCRIPTION("bq24735 battery charging driver");
+MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-28 23:42:28 +0000