--- /dev/null
+/*
+ * Battery charger driver for TI's tps65090
+ *
+ * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
+
+ * 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/>.
+ */
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/tps65090.h>
+
+#define TPS65090_REG_INTR_STS 0x00
+#define TPS65090_REG_CG_CTRL0 0x04
+#define TPS65090_REG_CG_CTRL1 0x05
+#define TPS65090_REG_CG_CTRL2 0x06
+#define TPS65090_REG_CG_CTRL3 0x07
+#define TPS65090_REG_CG_CTRL4 0x08
+#define TPS65090_REG_CG_CTRL5 0x09
+#define TPS65090_REG_CG_STATUS1 0x0a
+#define TPS65090_REG_CG_STATUS2 0x0b
+
+#define TPS65090_CHARGER_ENABLE BIT(0)
+#define TPS65090_VACG BIT(1)
+#define TPS65090_NOITERM BIT(5)
+
+struct tps65090_charger {
+ struct device *dev;
+ int ac_online;
+ int prev_ac_online;
+ int irq;
+ struct power_supply ac;
+ struct tps65090_platform_data *pdata;
+};
+
+static enum power_supply_property tps65090_ac_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int tps65090_low_chrg_current(struct tps65090_charger *charger)
+{
+ int ret;
+
+ ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
+ TPS65090_NOITERM);
+ if (ret < 0) {
+ dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
+ __func__, TPS65090_REG_CG_CTRL5);
+ return ret;
+ }
+ return 0;
+}
+
+static int tps65090_enable_charging(struct tps65090_charger *charger,
+ uint8_t enable)
+{
+ int ret;
+ uint8_t ctrl0 = 0;
+
+ ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
+ &ctrl0);
+ if (ret < 0) {
+ dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
+ __func__, TPS65090_REG_CG_CTRL0);
+ return ret;
+ }
+
+ ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
+ (ctrl0 | TPS65090_CHARGER_ENABLE));
+ if (ret < 0) {
+ dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
+ __func__, TPS65090_REG_CG_CTRL0);
+ return ret;
+ }
+ return 0;
+}
+
+static int tps65090_config_charger(struct tps65090_charger *charger)
+{
+ int ret;
+
+ if (charger->pdata->enable_low_current_chrg) {
+ ret = tps65090_low_chrg_current(charger);
+ if (ret < 0) {
+ dev_err(charger->dev,
+ "error configuring low charge current\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int tps65090_ac_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct tps65090_charger *charger = container_of(psy,
+ struct tps65090_charger, ac);
+
+ if (psp == POWER_SUPPLY_PROP_ONLINE) {
+ val->intval = charger->ac_online;
+ charger->prev_ac_online = charger->ac_online;
+ return 0;
+ }
+ return -EINVAL;
+}
+
+static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
+{
+ struct tps65090_charger *charger = dev_id;
+ int ret;
+ uint8_t status1 = 0;
+ uint8_t intrsts = 0;
+
+ ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
+ &status1);
+ if (ret < 0) {
+ dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
+ __func__, TPS65090_REG_CG_STATUS1);
+ return IRQ_HANDLED;
+ }
+ msleep(75);
+ ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
+ &intrsts);
+ if (ret < 0) {
+ dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
+ __func__, TPS65090_REG_INTR_STS);
+ return IRQ_HANDLED;
+ }
+
+ if (intrsts & TPS65090_VACG) {
+ ret = tps65090_enable_charging(charger, 1);
+ if (ret < 0)
+ return IRQ_HANDLED;
+ charger->ac_online = 1;
+ } else {
+ charger->ac_online = 0;
+ }
+
+ if (charger->prev_ac_online != charger->ac_online)
+ power_supply_changed(&charger->ac);
+
+ return IRQ_HANDLED;
+}
+
+#if defined(CONFIG_OF)
+
+#include <linux/of_device.h>
+
+static struct tps65090_platform_data *
+ tps65090_parse_dt_charger_data(struct platform_device *pdev)
+{
+ struct tps65090_platform_data *pdata;
+ struct device_node *np = pdev->dev.parent->of_node;
+ unsigned int prop;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
+ return NULL;
+ }
+
+ prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
+ pdata->enable_low_current_chrg = prop;
+
+ pdata->irq_base = -1;
+
+ return pdata;
+
+}
+#else
+static struct tps65090_platform_data *
+ tps65090_parse_dt_charger_data(struct platform_device *pdev)
+{
+ return NULL;
+}
+#endif
+
+static int tps65090_charger_probe(struct platform_device *pdev)
+{
+ struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
+ struct tps65090_charger *cdata;
+ struct tps65090_platform_data *pdata;
+ uint8_t status1 = 0;
+ int ret;
+ int irq;
+
+ pdata = dev_get_platdata(pdev->dev.parent);
+
+ if (!pdata && tps65090_mfd->dev->of_node)
+ pdata = tps65090_parse_dt_charger_data(pdev);
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "%s():no platform data available\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
+ if (!cdata) {
+ dev_err(&pdev->dev, "failed to allocate memory status\n");
+ return -ENOMEM;
+ }
+
+ dev_set_drvdata(&pdev->dev, cdata);
+
+ cdata->dev = &pdev->dev;
+ cdata->pdata = pdata;
+
+ cdata->ac.name = "tps65090-ac";
+ cdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
+ cdata->ac.get_property = tps65090_ac_get_property;
+ cdata->ac.properties = tps65090_ac_props;
+ cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);
+ cdata->ac.supplied_to = pdata->supplied_to;
+ cdata->ac.num_supplicants = pdata->num_supplicants;
+
+ ret = power_supply_register(&pdev->dev, &cdata->ac);
+ if (ret) {
+ dev_err(&pdev->dev, "failed: power supply register\n");
+ return ret;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0) {
+ dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
+ ret = irq;
+ goto fail_unregister_supply;
+ }
+
+ cdata->irq = irq;
+
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ tps65090_charger_isr, 0, "tps65090-charger", cdata);
+ if (ret) {
+ dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
+ ret);
+ goto fail_free_irq;
+ }
+
+ ret = tps65090_config_charger(cdata);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
+ goto fail_free_irq;
+ }
+
+ /* Check for charger presence */
+ ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
+ &status1);
+ if (ret < 0) {
+ dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
+ TPS65090_REG_CG_STATUS1);
+ goto fail_free_irq;
+ }
+
+ if (status1 != 0) {
+ ret = tps65090_enable_charging(cdata, 1);
+ if (ret < 0) {
+ dev_err(cdata->dev, "error enabling charger\n");
+ goto fail_free_irq;
+ }
+ cdata->ac_online = 1;
+ power_supply_changed(&cdata->ac);
+ }
+
+ return 0;
+
+fail_free_irq:
+ devm_free_irq(cdata->dev, irq, cdata);
+fail_unregister_supply:
+ power_supply_unregister(&cdata->ac);
+
+ return ret;
+}
+
+static int tps65090_charger_remove(struct platform_device *pdev)
+{
+ struct tps65090_charger *cdata = dev_get_drvdata(&pdev->dev);
+
+ devm_free_irq(cdata->dev, cdata->irq, cdata);
+ power_supply_unregister(&cdata->ac);
+
+ return 0;
+}
+
+static struct platform_driver tps65090_charger_driver = {
+ .driver = {
+ .name = "tps65090-charger",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps65090_charger_probe,
+ .remove = tps65090_charger_remove,
+};
+module_platform_driver(tps65090_charger_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
+MODULE_DESCRIPTION("tps65090 battery charger driver");
projects / mirror_ubuntu-artful-kernel.git / commitdiff