mfd: TPS65090: Add PMIC support

This PMIC MFD driver provides-
	PMIC register read/write access
	support for interrupt handling.

bug 909648

Change-Id: I7f1a22e055b08b9cd31e987c94589c2a8c857d73
Signed-off-by: venu byravarasu <vbyravarasu@nvidia.com>
Reviewed-on: http://git-master/r/73135
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/74894
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

3 files changed, 518 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 55fd5157b438..2cf0a06a9860 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -801,6 +801,25 @@ config MFD_TPS6591X
 	  additional drivers must be enabled in order to use the
 	  functionality of the device.
 
+config MFD_TPS65090
+	bool "TPS65090 Power Management chips"
+	depends on I2C && GENERIC_HARDIRQS
+	select MFD_CORE
+	select REGMAP_I2C
+	help
+	  If you say yes here you get support for the TPS65090 series of
+	  Power Management chips.
+	  This driver provides common support for accessing the device,
+	  additional drivers must be enabled in order to use the
+	  functionality of the device.
+
+config MFD_AAT2870_CORE
+	bool "Support for the AnalogicTech AAT2870"
+	select MFD_CORE
+	depends on I2C=y && GPIOLIB
+	help
+	  If you say yes here you get support for the AAT2870.
+
 config MFD_TPS80031
 	bool "TI TPS80031 Power Management chips"
 	depends on I2C && GPIOLIB && GENERIC_HARDIRQS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f9f9d400b0ee..6abb3f3ca41a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -103,6 +103,7 @@ obj-$(CONFIG_MFD_PM8XXX_IRQ) 	+= pm8xxx-irq.o
 obj-$(CONFIG_TPS65911_COMPARATOR)	+= tps65911-comparator.o
 obj-$(CONFIG_MFD_AAT2870_CORE)	+= aat2870-core.o
 obj-$(CONFIG_MFD_TPS6591X)	+= tps6591x.o
+obj-$(CONFIG_MFD_TPS65090)	+= tps65090.o
 obj-$(CONFIG_MFD_TPS80031)	+= tps80031.o
 obj-$(CONFIG_GPADC_TPS80031)	+= tps8003x-gpadc.o
 obj-$(CONFIG_MFD_MAX8907C)	+= max8907c.o
diff --git a/drivers/mfd/tps65090.c b/drivers/mfd/tps65090.c
new file mode 100644
index 000000000000..080f97aa264b
--- /dev/null
+++ b/drivers/mfd/tps65090.c
@@ -0,0 +1,498 @@
+/*
+ * driver/mfd/tps65090.c
+ *
+ * Core driver for TI TPS65090 PMIC family
+ *
+ * Copyright (C) 2012 NVIDIA Corporation
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65090.h>
+#include <linux/regmap.h>
+
+/* interrupt status registers */
+#define TPS65090_INT_STS	0x0
+#define TPS65090_INT_STS2	0x1
+
+/* interrupt mask registers */
+#define TPS65090_INT_MSK	0x2
+#define TPS65090_INT_MSK2	0x3
+
+
+enum irq_type {
+	EVENT,
+};
+
+struct tps65090_irq_data {
+	u8		mask_reg;
+	u8		mask_pos;
+	enum irq_type	type;
+};
+
+#define TPS65090_IRQ(_reg, _mask_pos, _type)	\
+	{					\
+		.mask_reg	= (_reg),	\
+		.mask_pos	= (_mask_pos),	\
+		.type		= (_type),	\
+	}
+
+static const struct tps65090_irq_data tps65090_irqs[] = {
+	[0]		= TPS65090_IRQ(0, 0, EVENT),
+	[1]		= TPS65090_IRQ(0, 1, EVENT),
+	[2]		= TPS65090_IRQ(0, 2, EVENT),
+	[3]		= TPS65090_IRQ(0, 3, EVENT),
+	[4]		= TPS65090_IRQ(0, 4, EVENT),
+	[5]		= TPS65090_IRQ(0, 5, EVENT),
+	[6]		= TPS65090_IRQ(0, 6, EVENT),
+	[7]		= TPS65090_IRQ(0, 7, EVENT),
+	[8]		= TPS65090_IRQ(1, 0, EVENT),
+	[9]		= TPS65090_IRQ(1, 1, EVENT),
+	[10]		= TPS65090_IRQ(1, 2, EVENT),
+	[11]		= TPS65090_IRQ(1, 3, EVENT),
+	[12]		= TPS65090_IRQ(1, 4, EVENT),
+	[13]		= TPS65090_IRQ(1, 5, EVENT),
+	[14]		= TPS65090_IRQ(1, 6, EVENT),
+	[15]		= TPS65090_IRQ(1, 7, EVENT),
+};
+
+struct tps65090 {
+	struct mutex		lock;
+	struct device		*dev;
+	struct i2c_client	*client;
+	struct regmap		*rmap;
+	struct irq_chip		irq_chip;
+	struct mutex		irq_lock;
+	int			irq_base;
+	u32			irq_en;
+	u8			mask_cache[2];
+	u8			mask_reg[2];
+};
+int tps65090_write(struct device *dev, int reg, uint8_t val)
+{
+	struct tps65090 *tps = dev_get_drvdata(dev);
+	return regmap_write(tps->rmap, reg, val);
+}
+int tps65090_read(struct device *dev, int reg, uint8_t *val)
+{
+	int rval, ret = 0;
+	struct tps65090 *tps = dev_get_drvdata(dev);
+	ret = regmap_read(tps->rmap, reg, &rval);
+	*val = rval;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(tps65090_read);
+
+int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num)
+{
+	struct tps65090 *tps = dev_get_drvdata(dev);
+	return regmap_update_bits_lazy(tps->rmap, reg, BIT(bit_num), ~0u);
+
+}
+EXPORT_SYMBOL_GPL(tps65090_set_bits);
+
+int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num)
+{
+	struct tps65090 *tps = dev_get_drvdata(dev);
+	return regmap_update_bits_lazy(tps->rmap, reg, BIT(bit_num), 0u);
+}
+EXPORT_SYMBOL_GPL(tps65090_clr_bits);
+
+static int __remove_subdev(struct device *dev, void *unused)
+{
+	platform_device_unregister(to_platform_device(dev));
+	return 0;
+}
+
+static int tps65090_remove_subdevs(struct tps65090 *tps65090)
+{
+	return device_for_each_child(tps65090->dev, NULL, __remove_subdev);
+}
+
+static void tps65090_irq_lock(struct irq_data *data)
+{
+	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&tps65090->irq_lock);
+}
+
+static void tps65090_irq_mask(struct irq_data *irq_data)
+{
+	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
+	unsigned int __irq = irq_data->irq - tps65090->irq_base;
+	const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
+
+	if (data->type == EVENT)
+		tps65090->mask_reg[data->mask_reg] |= (1 << data->mask_pos);
+	else
+		tps65090->mask_reg[data->mask_reg] |= (3 << data->mask_pos);
+
+	tps65090->irq_en &= ~(1 << __irq);
+}
+
+static void tps65090_irq_unmask(struct irq_data *irq_data)
+{
+	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
+
+	unsigned int __irq = irq_data->irq - tps65090->irq_base;
+	const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
+
+	if (data->type == EVENT) {
+		tps65090->mask_reg[data->mask_reg] &= ~(1 << data->mask_pos);
+		tps65090->irq_en |= (1 << __irq);
+	}
+}
+
+static void tps65090_irq_sync_unlock(struct irq_data *data)
+{
+	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(tps65090->mask_reg); i++) {
+		if (tps65090->mask_reg[i] != tps65090->mask_cache[i]) {
+			if (!WARN_ON(tps65090_write(tps65090->dev,
+						TPS65090_INT_MSK + 2*i,
+						tps65090->mask_reg[i])))
+				tps65090->mask_cache[i] = tps65090->mask_reg[i];
+		}
+	}
+
+	mutex_unlock(&tps65090->irq_lock);
+}
+
+static int tps65090_irq_set_type(struct irq_data *irq_data, unsigned int type)
+{
+	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
+
+	unsigned int __irq = irq_data->irq - tps65090->irq_base;
+	const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
+
+	if (data->type != EVENT) /* add support for GPIO, if needed */
+		return -EINVAL;
+
+	return 0;
+}
+
+static irqreturn_t tps65090_irq(int irq, void *data)
+{
+	struct tps65090 *tps65090 = data;
+	int ret = 0;
+	u8 tmp[3];
+	u8 int_ack;
+	u32 acks, mask = 0;
+	int i;
+
+	for (i = 0; i < 3; i++) {
+		ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + 2*i,
+				&tmp[i]);
+		if (ret < 0) {
+			dev_err(tps65090->dev,
+				"failed to read interrupt status\n");
+			return IRQ_NONE;
+		}
+		if (tmp[i]) {
+			/* Ack only those interrupts which are enabled */
+			int_ack = tmp[i] & (~(tps65090->mask_cache[i]));
+			ret = tps65090_write(tps65090->dev,
+					TPS65090_INT_STS + 2*i,	int_ack);
+			if (ret < 0) {
+				dev_err(tps65090->dev,
+					"failed to write interrupt status\n");
+				return IRQ_NONE;
+			}
+		}
+	}
+
+	acks = (tmp[2] << 16) | (tmp[1] << 8) | tmp[0];
+
+	for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) {
+		if (tps65090_irqs[i].type == EVENT)
+			mask = (1 << (tps65090_irqs[i].mask_pos
+					+ tps65090_irqs[i].mask_reg*8));
+		else
+			return -EINVAL;
+		if ((acks & mask) && (tps65090->irq_en & (1 << i)))
+			handle_nested_irq(tps65090->irq_base + i);
+	}
+	return IRQ_HANDLED;
+}
+
+static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq,
+				int irq_base)
+{
+	int i, ret;
+
+	if (!irq_base) {
+		dev_warn(tps65090->dev, "No interrupt support on IRQ base\n");
+		return -EINVAL;
+	}
+
+	mutex_init(&tps65090->irq_lock);
+
+	tps65090->mask_reg[0] = 0xFF;
+	tps65090->mask_reg[1] = 0xFF;
+	for (i = 0; i < 2; i++) {
+		tps65090->mask_cache[i] = tps65090->mask_reg[i];
+		tps65090_write(tps65090->dev, TPS65090_INT_MSK + i,
+				 tps65090->mask_cache[i]);
+	}
+
+	for (i = 0; i < 2; i++)
+		tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff);
+
+	tps65090->irq_base = irq_base;
+
+	tps65090->irq_chip.name = "tps65090";
+	tps65090->irq_chip.irq_mask = tps65090_irq_mask;
+	tps65090->irq_chip.irq_unmask = tps65090_irq_unmask;
+	tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock;
+	tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock;
+	tps65090->irq_chip.irq_set_type = tps65090_irq_set_type;
+
+	for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) {
+		int __irq = i + tps65090->irq_base;
+		irq_set_chip_data(__irq, tps65090);
+		irq_set_chip_and_handler(__irq, &tps65090->irq_chip,
+					 handle_simple_irq);
+		irq_set_nested_thread(__irq, 1);
+#ifdef CONFIG_ARM
+		set_irq_flags(__irq, IRQF_VALID);
+#endif
+	}
+
+	ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT,
+				"tps65090", tps65090);
+	if (!ret) {
+		device_init_wakeup(tps65090->dev, 1);
+		enable_irq_wake(irq);
+	}
+
+	return ret;
+}
+
+static int __devinit tps65090_add_subdevs(struct tps65090 *tps65090,
+					  struct tps65090_platform_data *pdata)
+{
+	struct tps65090_subdev_info *subdev;
+	struct platform_device *pdev;
+	int i, ret = 0;
+
+	for (i = 0; i < pdata->num_subdevs; i++) {
+		subdev = &pdata->subdevs[i];
+
+		pdev = platform_device_alloc(subdev->name, subdev->id);
+
+		pdev->dev.parent = tps65090->dev;
+		pdev->dev.platform_data = subdev->platform_data;
+
+		ret = platform_device_add(pdev);
+		if (ret)
+			goto failed;
+	}
+	return 0;
+
+failed:
+	tps65090_remove_subdevs(tps65090);
+	return ret;
+}
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+static void print_regs(const char *header, struct seq_file *s,
+		struct i2c_client *client, int start_offset,
+		int end_offset)
+{
+	int reg_val;
+	int i;
+	int ret;
+	struct tps65090 *tps = s->private;
+	seq_printf(s, "%s\n", header);
+	for (i = start_offset; i <= end_offset; ++i) {
+		ret = regmap_read(tps->rmap, i, &reg_val);
+		if (ret >= 0)
+			seq_printf(s, "Reg 0x%02x Value 0x%02x\n", i, reg_val);
+	}
+	seq_printf(s, "------------------\n");
+}
+
+static int dbg_tps_show(struct seq_file *s, void *unused)
+{
+	struct tps65090 *tps = s->private;
+	struct i2c_client *client = tps->client;
+
+	seq_printf(s, "TPS65090 Registers\n");
+	seq_printf(s, "------------------\n");
+
+	print_regs("All Regs",    s, client, 0x0, 24);
+	return 0;
+}
+
+static int dbg_tps_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, dbg_tps_show, inode->i_private);
+}
+
+static const struct file_operations debug_fops = {
+	.open		= dbg_tps_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+static void __init tps65090_debuginit(struct tps65090 *tps)
+{
+	(void)debugfs_create_file("tps65090", S_IRUGO, NULL,
+			tps, &debug_fops);
+}
+#else
+static void __init tps65090_debuginit(struct tps65090 *tpsi)
+{
+	return;
+}
+#endif
+
+static const struct regmap_config tps65090_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static int __devinit tps65090_i2c_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	struct tps65090_platform_data *pdata = client->dev.platform_data;
+	struct tps65090 *tps65090;
+	int ret;
+
+	if (!pdata) {
+		dev_err(&client->dev, "tps65090 requires platform data\n");
+		return -ENOTSUPP;
+	}
+
+	tps65090 = kzalloc(sizeof(struct tps65090), GFP_KERNEL);
+	if (tps65090 == NULL)
+		return -ENOMEM;
+
+	tps65090->client = client;
+	tps65090->dev = &client->dev;
+	i2c_set_clientdata(client, tps65090);
+
+	mutex_init(&tps65090->lock);
+
+	if (client->irq) {
+		ret = tps65090_irq_init(tps65090, client->irq,
+					pdata->irq_base);
+		if (ret) {
+			dev_err(&client->dev, "IRQ init failed: %d\n", ret);
+			goto err_irq_init;
+		}
+	}
+
+	ret = tps65090_add_subdevs(tps65090, pdata);
+	if (ret) {
+		dev_err(&client->dev, "add devices failed: %d\n", ret);
+		goto err_add_devs;
+	}
+
+	tps65090->rmap = regmap_init_i2c(tps65090->client,
+		&tps65090_regmap_config);
+	if (IS_ERR(tps65090->rmap)) {
+		dev_err(&client->dev, "regmap_init failed: %ld\n",
+			PTR_ERR(tps65090->rmap));
+		goto err_add_devs;
+	};
+	tps65090_debuginit(tps65090);
+
+	return 0;
+
+err_add_devs:
+	if (client->irq)
+		free_irq(client->irq, tps65090);
+err_irq_init:
+	kfree(tps65090);
+	return ret;
+}
+
+static int __devexit tps65090_i2c_remove(struct i2c_client *client)
+{
+	struct tps65090 *tps65090 = i2c_get_clientdata(client);
+
+	if (client->irq)
+		free_irq(client->irq, tps65090);
+
+	regmap_exit(tps65090->rmap);
+	kfree(tps65090);
+	return 0;
+}
+#ifdef CONFIG_PM
+static int tps65090_i2c_suspend(struct i2c_client *client, pm_message_t state)
+{
+	if (client->irq)
+		disable_irq(client->irq);
+	return 0;
+}
+
+static int tps65090_i2c_resume(struct i2c_client *client)
+{
+	if (client->irq)
+		enable_irq(client->irq);
+	return 0;
+}
+#endif
+
+
+static const struct i2c_device_id tps65090_id_table[] = {
+	{ "tps65090", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
+
+static struct i2c_driver tps65090_driver = {
+	.driver	= {
+		.name	= "tps65090",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= tps65090_i2c_probe,
+	.remove		= __devexit_p(tps65090_i2c_remove),
+#ifdef CONFIG_PM
+	.suspend	= tps65090_i2c_suspend,
+	.resume		= tps65090_i2c_resume,
+#endif
+	.id_table	= tps65090_id_table,
+};
+
+static int __init tps65090_init(void)
+{
+	return i2c_add_driver(&tps65090_driver);
+}
+subsys_initcall(tps65090_init);
+
+static void __exit tps65090_exit(void)
+{
+	i2c_del_driver(&tps65090_driver);
+}
+module_exit(tps65090_exit);
+
+MODULE_DESCRIPTION("TPS65090 core driver");
+MODULE_LICENSE("GPL");