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Date: Thu, 10 Jul 2008 21:04:43 +0200
From: Philipp Zabel <philipp.zabel@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Liam Girdwood <lg@...nsource.wolfsonmicro.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 1/2] regulator: TI bq24022 Li-Ion Charger driver
This adds a regulator driver for the TI bq24022 Single-Chip
Li-Ion Charger with its nCE and ISET2 pins connected to GPIOs.
Signed-off-by: Philipp Zabel <philipp.zabel@...il.com>
---
drivers/regulator/Kconfig | 10 ++
drivers/regulator/Makefile | 2 +
drivers/regulator/bq24022.c | 167 +++++++++++++++++++++++++++++++++++++
include/linux/regulator/bq24022.h | 23 +++++
4 files changed, 202 insertions(+), 0 deletions(-)
create mode 100644 drivers/regulator/bq24022.c
create mode 100644 include/linux/regulator/bq24022.h
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 84f89ec..a656128 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -46,4 +46,14 @@ config REGULATOR_VIRTUAL_CONSUMER
If unsure, say no.
+config REGULATOR_BQ24022
+ tristate "TI bq24022 Dual Input 1-Cell Li-Ion Charger IC"
+ default n
+ select REGULATOR
+ help
+ This driver controls a TI bq24022 Charger attached via
+ GPIOs. The provided current regulator can enable/disable
+ charging select between 100 mA and 500 mA charging current
+ limit.
+
endmenu
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 29528b7..ac2c64e 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -7,4 +7,6 @@ obj-$(CONFIG_REGULATOR) += core.o
obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
+obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
+
ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/bq24022.c b/drivers/regulator/bq24022.c
new file mode 100644
index 0000000..bdae7f7
--- /dev/null
+++ b/drivers/regulator/bq24022.c
@@ -0,0 +1,167 @@
+/*
+ * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)
+ * 1-Cell Li-Ion Charger connected via GPIOs.
+ *
+ * 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/gpio.h>
+#include <linux/regulator/bq24022.h>
+#include <linux/regulator/driver.h>
+
+static int bq24022_set_current_limit(struct regulator_dev *rdev,
+ int min_uA, int max_uA)
+{
+ struct platform_device *pdev = rdev_get_drvdata(rdev);
+ struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+
+ dev_dbg(&pdev->dev, "setting current limit to %s mA\n",
+ max_uA >= 500000 ? "500" : "100");
+
+ /* REVISIT: maybe return error if min_uA != 0 ? */
+ gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);
+ return 0;
+}
+
+static int bq24022_get_current_limit(struct regulator_dev *rdev)
+{
+ struct platform_device *pdev = rdev_get_drvdata(rdev);
+ struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+
+ return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
+}
+
+static int bq24022_enable(struct regulator_dev *rdev)
+{
+ struct platform_device *pdev = rdev_get_drvdata(rdev);
+ struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+
+ dev_dbg(&pdev->dev, "enabling charger\n");
+
+ gpio_set_value(pdata->gpio_nce, 0);
+ return 0;
+}
+
+static int bq24022_disable(struct regulator_dev *rdev)
+{
+ struct platform_device *pdev = rdev_get_drvdata(rdev);
+ struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+
+ dev_dbg(&pdev->dev, "disabling charger\n");
+
+ gpio_set_value(pdata->gpio_nce, 1);
+ return 0;
+}
+
+static int bq24022_is_enabled(struct regulator_dev *rdev)
+{
+ struct platform_device *pdev = rdev_get_drvdata(rdev);
+ struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+
+ return !gpio_get_value(pdata->gpio_nce);
+}
+
+static struct regulator_ops bq24022_ops = {
+ .set_current_limit = bq24022_set_current_limit,
+ .get_current_limit = bq24022_get_current_limit,
+ .enable = bq24022_enable,
+ .disable = bq24022_disable,
+ .is_enabled = bq24022_is_enabled,
+};
+
+static struct regulator_desc bq24022_desc = {
+ .name = "bq24022",
+ .ops = &bq24022_ops,
+ .type = REGULATOR_CURRENT,
+};
+
+static int __init bq24022_probe(struct platform_device *pdev)
+{
+ struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+ struct regulator_dev *bq24022;
+ int ret;
+
+ if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2)
+ return -EINVAL;
+
+ 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_iset2, "charge_mode");
+ if (ret) {
+ dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",
+ pdata->gpio_iset2);
+ goto err_iset2;
+ }
+ ret = gpio_direction_output(pdata->gpio_iset2, 0);
+ ret = gpio_direction_output(pdata->gpio_nce, 1);
+
+ bq24022 = regulator_register(&bq24022_desc, pdev);
+ if (IS_ERR(bq24022)) {
+ dev_dbg(&pdev->dev, "couldn't register regulator\n");
+ ret = PTR_ERR(bq24022);
+ goto err_reg;
+ }
+ platform_set_drvdata(pdev, bq24022);
+ dev_dbg(&pdev->dev, "registered regulator\n");
+
+ return 0;
+err_reg:
+ gpio_free(pdata->gpio_iset2);
+err_iset2:
+ gpio_free(pdata->gpio_nce);
+err_ce:
+ return ret;
+}
+
+static int __devexit bq24022_remove(struct platform_device *pdev)
+{
+ struct bq24022_mach_info *pdata = pdev->dev.platform_data;
+ struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
+
+ regulator_unregister(bq24022);
+ gpio_free(pdata->gpio_iset2);
+ gpio_free(pdata->gpio_nce);
+
+ return 0;
+}
+
+static struct platform_driver bq24022_driver = {
+ .driver = {
+ .name = "bq24022",
+ },
+ .remove = __devexit_p(bq24022_remove),
+};
+
+static int __init bq24022_init()
+{
+ platform_driver_probe(&bq24022_driver, bq24022_probe);
+}
+
+static void __exit bq24022_exit()
+{
+ platform_driver_unregister(&bq24022_driver);
+}
+
+/*
+ * make sure this is probed before gpio_vbus and pda_power,
+ * but after asic3 or other GPIO expander drivers.
+ */
+subsys_initcall(bq24022_init);
+module_exit(bq24022_exit);
+
+MODULE_AUTHOR("Philipp Zabel");
+MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/bq24022.h b/include/linux/regulator/bq24022.h
new file mode 100644
index 0000000..6824a81
--- /dev/null
+++ b/include/linux/regulator/bq24022.h
@@ -0,0 +1,23 @@
+/*
+ * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)
+ * 1-Cell Li-Ion Charger connected via GPIOs.
+ *
+ * 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.
+ *
+ */
+
+/**
+ *bq24022_mach_info - platform data for bq24022
+ *@...o_nce: GPIO line connected to the nCE pin,
+ * used to enable / disable charging.
+ *@...o_iset2: GPIO line connected to the ISET2 pin,
+ * used to limit charging current to 100 mA / 500 mA.
+ */
+struct bq24022_mach_info {
+ int gpio_nce;
+ int gpio_iset2;
+};
--
1.5.6.2
--
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