--- /dev/null
+/*
+ * Battery charger driver for TI's tps65217
+ *
+ * Copyright (c) 2015, Collabora Ltd.
+
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Battery charger driver for TI's tps65217
+ */
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/power_supply.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65217.h>
+
+#define POLL_INTERVAL (HZ * 2)
+
+struct tps65217_charger {
+ struct tps65217 *tps;
+ struct device *dev;
+ struct power_supply *ac;
+
+ int ac_online;
+ int prev_ac_online;
+
+ struct task_struct *poll_task;
+};
+
+static enum power_supply_property tps65217_ac_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int tps65217_config_charger(struct tps65217_charger *charger)
+{
+ int ret;
+
+ dev_dbg(charger->dev, "%s\n", __func__);
+
+ /*
+ * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
+ *
+ * The device can be configured to support a 100k NTC (B = 3960) by
+ * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
+ * is not recommended to do so. In sleep mode, the charger continues
+ * charging the battery, but all register values are reset to default
+ * values. Therefore, the charger would get the wrong temperature
+ * information. If 100k NTC setting is required, please contact the
+ * factory.
+ *
+ * ATTENTION, conflicting information, from p. 46
+ *
+ * NTC TYPE (for battery temperature measurement)
+ * 0 – 100k (curve 1, B = 3960)
+ * 1 – 10k (curve 2, B = 3480) (default on reset)
+ *
+ */
+ ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
+ TPS65217_CHGCONFIG1_NTC_TYPE,
+ TPS65217_PROTECT_NONE);
+ if (ret) {
+ dev_err(charger->dev,
+ "failed to set 100k NTC setting: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tps65217_enable_charging(struct tps65217_charger *charger)
+{
+ int ret;
+
+ /* charger already enabled */
+ if (charger->ac_online)
+ return 0;
+
+ dev_dbg(charger->dev, "%s: enable charging\n", __func__);
+ ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
+ TPS65217_CHGCONFIG1_CHG_EN,
+ TPS65217_CHGCONFIG1_CHG_EN,
+ TPS65217_PROTECT_NONE);
+ if (ret) {
+ dev_err(charger->dev,
+ "%s: Error in writing CHG_EN in reg 0x%x: %d\n",
+ __func__, TPS65217_REG_CHGCONFIG1, ret);
+ return ret;
+ }
+
+ charger->ac_online = 1;
+
+ return 0;
+}
+
+static int tps65217_ac_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct tps65217_charger *charger = power_supply_get_drvdata(psy);
+
+ if (psp == POWER_SUPPLY_PROP_ONLINE) {
+ val->intval = charger->ac_online;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static irqreturn_t tps65217_charger_irq(int irq, void *dev)
+{
+ int ret, val;
+ struct tps65217_charger *charger = dev;
+
+ charger->prev_ac_online = charger->ac_online;
+
+ ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
+ if (ret < 0) {
+ dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
+ __func__, TPS65217_REG_STATUS);
+ return IRQ_HANDLED;
+ }
+
+ dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);
+
+ /* check for AC status bit */
+ if (val & TPS65217_STATUS_ACPWR) {
+ ret = tps65217_enable_charging(charger);
+ if (ret) {
+ dev_err(charger->dev,
+ "failed to enable charger: %d\n", ret);
+ return IRQ_HANDLED;
+ }
+ } else {
+ charger->ac_online = 0;
+ }
+
+ if (charger->prev_ac_online != charger->ac_online)
+ power_supply_changed(charger->ac);
+
+ ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
+ if (ret < 0) {
+ dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
+ __func__, TPS65217_REG_CHGCONFIG0);
+ return IRQ_HANDLED;
+ }
+
+ if (val & TPS65217_CHGCONFIG0_ACTIVE)
+ dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
+ else
+ dev_dbg(charger->dev,
+ "%s: charger is NOT charging\n", __func__);
+
+ return IRQ_HANDLED;
+}
+
+static int tps65217_charger_poll_task(void *data)
+{
+ set_freezable();
+
+ while (!kthread_should_stop()) {
+ schedule_timeout_interruptible(POLL_INTERVAL);
+ try_to_freeze();
+ tps65217_charger_irq(-1, data);
+ }
+ return 0;
+}
+
+static const struct power_supply_desc tps65217_charger_desc = {
+ .name = "tps65217-ac",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .get_property = tps65217_ac_get_property,
+ .properties = tps65217_ac_props,
+ .num_properties = ARRAY_SIZE(tps65217_ac_props),
+};
+
+static int tps65217_charger_probe(struct platform_device *pdev)
+{
+ struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
+ struct tps65217_charger *charger;
+ int ret;
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ charger->tps = tps;
+ charger->dev = &pdev->dev;
+
+ charger->ac = devm_power_supply_register(&pdev->dev,
+ &tps65217_charger_desc,
+ NULL);
+ if (IS_ERR(charger->ac)) {
+ dev_err(&pdev->dev, "failed: power supply register\n");
+ return PTR_ERR(charger->ac);
+ }
+
+ ret = tps65217_config_charger(charger);
+ if (ret < 0) {
+ dev_err(charger->dev, "charger config failed, err %d\n", ret);
+ return ret;
+ }
+
+ charger->poll_task = kthread_run(tps65217_charger_poll_task,
+ charger, "ktps65217charger");
+ if (IS_ERR(charger->poll_task)) {
+ ret = PTR_ERR(charger->poll_task);
+ dev_err(charger->dev, "Unable to run kthread err %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tps65217_charger_remove(struct platform_device *pdev)
+{
+ struct tps65217_charger *charger = platform_get_drvdata(pdev);
+
+ kthread_stop(charger->poll_task);
+
+ return 0;
+}
+
+static const struct of_device_id tps65217_charger_match_table[] = {
+ { .compatible = "ti,tps65217-charger", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);
+
+static struct platform_driver tps65217_charger_driver = {
+ .probe = tps65217_charger_probe,
+ .remove = tps65217_charger_remove,
+ .driver = {
+ .name = "tps65217-charger",
+ .of_match_table = of_match_ptr(tps65217_charger_match_table),
+ },
+
+};
+module_platform_driver(tps65217_charger_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
+MODULE_DESCRIPTION("TPS65217 battery charger driver");
projects / karo-tx-linux.git / commitdiff