This driver controls a TI bq2407x charger attached via GPIOs.
The provided current regulator can enable/disable charging and
select between 100 mA, 500 mA and a machine specific current limit.
Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
---
Changes since v1:
- add private struct to keep track of gpio states
- get max_uA from regulator_init_data
(no need to define it twice)
- disallow setting current limix below 100mA
drivers/regulator/Kconfig | 8 +
drivers/regulator/Makefile | 1 +
drivers/regulator/bq2407x.c | 264 +++++++++++++++++++++++++++++++++++++
include/linux/regulator/bq2407x.h | 35 +++++
4 files changed, 308 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index c7fd2c0..921e271 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -72,6 +72,14 @@ config REGULATOR_BQ24022
charging select between 100 mA and 500 mA charging current
limit.
+config REGULATOR_BQ2407x
+ tristate "TI bq2407x Li-Ion Charger IC"
+ help
+ This driver controls a TI bq2407x Charger attached via
+ GPIOs. The provided current regulator can enable/disable
+ charging select between 100 mA, 500 mA and a machine specific
+ charging current limit.
+
config REGULATOR_MAX1586
tristate "Maxim 1586/1587 voltage regulator"
depends on I2C
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 040d5aa..ce65493 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
+obj-$(CONFIG_REGULATOR_BQ2407x) += bq2407x.o
obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
diff --git a/drivers/regulator/bq2407x.c b/drivers/regulator/bq2407x.c
new file mode 100644
index 0000000..a8221d5
--- /dev/null
+++ b/drivers/regulator/bq2407x.c
@@ -0,0 +1,264 @@
+/*
+ * Support for TI bq2407x USB-friendly
+ * Li-Ion Charger connected via GPIOs.
+ *
+ * Copyright (c) 2011 Heiko Stuebner
+ *
+ * based on the bq24022 driver
+ * Copyright (c) 2008 Philipp Zabel
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/regulator/bq2407x.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+
+struct bq2407x {
+ struct regulator_dev *rdev;
+
+ int gpio_nce;
+ int gpio_en2;
+ int gpio_en1;
+
+ int state_nce;
+ int state_en2;
+ int state_en1;
+
+ int max_uA;
+};
+
+
+static int bq2407x_set_current_limit(struct regulator_dev *rdev,
+ int min_uA, int max_uA)
+{
+ struct bq2407x *bq = rdev_get_drvdata(rdev);
+
+ if (bq->max_uA && bq->max_uA > 500000
+ && max_uA >= bq->max_uA) {
+ dev_dbg(rdev_get_dev(rdev),
+ "setting current limit to %d mA\n",
+ bq->max_uA / 1000);
+ gpio_set_value(bq->gpio_en2, 1);
+ bq->state_en2 = 1;
+ gpio_set_value(bq->gpio_en1, 0);
+ bq->state_en1 = 0;
+ } else if (max_uA >= 500000) {
+ dev_dbg(rdev_get_dev(rdev),
+ "setting current limit to 500 mA\n");
+ gpio_set_value(bq->gpio_en2, 0);
+ bq->state_en2 = 0;
+ gpio_set_value(bq->gpio_en1, 1);
+ bq->state_en1 = 1;
+ } else if (max_uA >= 100000) {
+ dev_dbg(rdev_get_dev(rdev),
+ "setting current limit to 100 mA\n");
+ gpio_set_value(bq->gpio_en2, 0);
+ bq->state_en2 = 0;
+ gpio_set_value(bq->gpio_en1, 0);
+ bq->state_en1 = 0;
+ } else {
+ dev_err(rdev_get_dev(rdev), "cannot set current limit below 100 mA\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int bq2407x_get_current_limit(struct regulator_dev *rdev)
+{
+ struct bq2407x *bq = rdev_get_drvdata(rdev);
+
+ if (bq->state_en2 && bq->state_en1)
+ return 0;
+ else if (bq->state_en2 && !bq->state_en1)
+ return bq->max_uA;
+ else if (!bq->state_en2 && bq->state_en1)
+ return 500000;
+ else
+ return 100000;
+}
+
+static int bq2407x_enable(struct regulator_dev *rdev)
+{
+ struct bq2407x *bq = rdev_get_drvdata(rdev);
+
+ dev_dbg(rdev_get_dev(rdev), "enabling charger\n");
+
+ gpio_set_value(bq->gpio_nce, 0);
+ bq->state_nce = 0;
+
+ return 0;
+}
+
+static int bq2407x_disable(struct regulator_dev *rdev)
+{
+ struct bq2407x *bq = rdev_get_drvdata(rdev);
+
+ dev_dbg(rdev_get_dev(rdev), "disabling charger\n");
+
+ gpio_set_value(bq->gpio_nce, 1);
+ bq->state_nce = 1;
+
+ return 0;
+}
+
+static int bq2407x_is_enabled(struct regulator_dev *rdev)
+{
+ struct bq2407x *bq = rdev_get_drvdata(rdev);
+
+ return !bq->state_nce;
+}
+
+static struct regulator_ops bq2407x_ops = {
+ .set_current_limit = bq2407x_set_current_limit,
+ .get_current_limit = bq2407x_get_current_limit,
+ .enable = bq2407x_enable,
+ .disable = bq2407x_disable,
+ .is_enabled = bq2407x_is_enabled,
+};
+
+static struct regulator_desc bq2407x_desc = {
+ .name = "bq2407x",
+ .ops = &bq2407x_ops,
+ .type = REGULATOR_CURRENT,
+ .owner = THIS_MODULE,
+};
+
+static int __init bq2407x_probe(struct platform_device *pdev)
+{
+ struct bq2407x_mach_info *pdata = pdev->dev.platform_data;
+ struct bq2407x *bq;
+ int ret;
+
+ if (!pdata || !pdata->gpio_nce || !pdata->gpio_en1 || !pdata->gpio_en2)
+ return -EINVAL;
+
+ bq = kzalloc(sizeof(struct bq2407x), GFP_KERNEL);
+ if (!bq) {
+ dev_err(&pdev->dev, "cannot allocate memory\n");
+ return -ENOMEM;
+ }
+
+ ret = gpio_request(pdata->gpio_nce, "ncharge_en");
+ if (ret) {
+ dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",
+ pdata->gpio_nce);
+ goto err_ce;
+ }
+ ret = gpio_request(pdata->gpio_en2, "charge_mode_en2");
+ if (ret) {
+ dev_dbg(&pdev->dev, "couldn't request EN2 GPIO: %d\n",
+ pdata->gpio_en2);
+ goto err_en2;
+ }
+ ret = gpio_request(pdata->gpio_en1, "charge_mode_en1");
+ if (ret) {
+ dev_dbg(&pdev->dev, "couldn't request EN1 GPIO: %d\n",
+ pdata->gpio_en1);
+ goto err_en1;
+ }
+
+ /* set initial current to 100mA and disable regulator */
+ ret = gpio_direction_output(pdata->gpio_en2, 0);
+ if (ret) {
+ dev_dbg(&pdev->dev, "couldn't set EN2 GPIO: %d\n",
+ pdata->gpio_en1);
+ goto err_reg;
+ }
+ bq->gpio_en2 = pdata->gpio_en2;
+ bq->state_en2 = 0;
+ ret = gpio_direction_output(pdata->gpio_en1, 0);
+ if (ret) {
+ dev_dbg(&pdev->dev, "couldn't set EN1 GPIO: %d\n",
+ pdata->gpio_en1);
+ goto err_reg;
+ }
+ bq->gpio_en1 = pdata->gpio_en1;
+ bq->state_en1 = 0;
+ ret = gpio_direction_output(pdata->gpio_nce, 1);
+ if (ret) {
+ dev_dbg(&pdev->dev, "couldn't set nCE GPIO: %d\n",
+ pdata->gpio_en1);
+ goto err_reg;
+ }
+ bq->gpio_nce = pdata->gpio_nce;
+ bq->state_nce = 1;
+
+ /* get maximum current from regulator_init_data */
+ if (pdata->init_data) {
+ bq->max_uA = pdata->init_data->constraints.max_uA;
+ dev_dbg(&pdev->dev, "maximum current is %d mA\n",
+ bq->max_uA / 1000);
+ }
+
+ bq->rdev = regulator_register(&bq2407x_desc, &pdev->dev,
+ pdata->init_data, bq);
+ if (IS_ERR(bq->rdev)) {
+ dev_dbg(&pdev->dev, "couldn't register regulator\n");
+ ret = PTR_ERR(bq->rdev);
+ goto err_reg;
+ }
+
+ platform_set_drvdata(pdev, bq);
+ dev_dbg(&pdev->dev, "registered regulator\n");
+
+ return 0;
+err_reg:
+ gpio_free(pdata->gpio_en1);
+err_en1:
+ gpio_free(pdata->gpio_en2);
+err_en2:
+ gpio_free(pdata->gpio_nce);
+err_ce:
+ kfree(bq);
+ return ret;
+}
+
+static int __devexit bq2407x_remove(struct platform_device *pdev)
+{
+ struct bq2407x *bq = platform_get_drvdata(pdev);
+
+ regulator_unregister(bq->rdev);
+ gpio_free(bq->gpio_en1);
+ gpio_free(bq->gpio_en2);
+ gpio_free(bq->gpio_nce);
+
+ kfree(bq);
+
+ return 0;
+}
+
+static struct platform_driver bq2407x_driver = {
+ .driver = {
+ .name = "bq2407x",
+ },
+ .remove = __devexit_p(bq2407x_remove),
+};
+
+static int __init bq2407x_init(void)
+{
+ return platform_driver_probe(&bq2407x_driver, bq2407x_probe);
+}
+
+static void __exit bq2407x_exit(void)
+{
+ platform_driver_unregister(&bq2407x_driver);
+}
+
+module_init(bq2407x_init);
+module_exit(bq2407x_exit);
+
+MODULE_AUTHOR("Heiko Stuebner");
+MODULE_DESCRIPTION("TI bq2407x Li-Ion Charger driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/bq2407x.h b/include/linux/regulator/bq2407x.h
new file mode 100644
index 0000000..14d6d93
--- /dev/null
+++ b/include/linux/regulator/bq2407x.h
@@ -0,0 +1,35 @@
+/*
+ * Support for TI bq2407x 1.5A USB-friendly
+ * Li-Ion Charger connected via GPIOs.
+ *
+ * Copyright (c) 2011 Heiko Stuebner
+ *
+ * based on the bq24022 driver
+ * Copyright (c) 2008 Philipp Zabel
+ *
+ * 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.
+ *
+ */
+
+struct regulator_init_data;
+
+/**
+ * bq2407x_mach_info - platform data for bq2407x
+ * @gpio_nce: GPIO line connected to the nCE pin, used to control charging
+ * @gpio_en2: GPIO line connected to the EN2 pin, used to limit charging
+ * @gpio_en1: GPIO line connected to the EN1 pin, used to limit charging
+ * @max_uA: maximum current defined by resistor on ILIM connector
+ * Modes of operation:
+ * EN2 = 0, EN1 = 0: 100mA
+ * EN2 = 0, EN1 = 1: 500mA
+ * EN2 = 1, EN1 = 0: max_current
+ * EN2 = 1, EN1 = 1: Standby (usb suspend)
+ */
+struct bq2407x_mach_info {
+ int gpio_nce;
+ int gpio_en2;
+ int gpio_en1;
+ struct regulator_init_data *init_data;
+};
--
tg: (93ee7a9..) topic/drivers/bq2407x (depends on: master)
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