1 files changed, 333 insertions, 0 deletions
diff --git a/drivers/mfd/tps65090.c b/drivers/mfd/tps65090.c
new file mode 100644
index 000000000000..25f463de1513
--- /dev/null
+++ b/drivers/mfd/tps65090.c
@@ -0,0 +1,333 @@
+/*
+ * Core driver for TI TPS65090 PMIC family
+ *
+ * Copyright (c) 2012, 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/interrupt.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/err.h>
+
+#define NUM_INT_REG 2
+#define TOTAL_NUM_REG 0x18
+
+/* 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
+
+struct tps65090_irq_data {
+	u8		mask_reg;
+	u8		mask_pos;
+};
+
+#define TPS65090_IRQ(_reg, _mask_pos)		\
+	{					\
+		.mask_reg	= (_reg),	\
+		.mask_pos	= (_mask_pos),	\
+	}
+
+static const struct tps65090_irq_data tps65090_irqs[] = {
+	[0]		= TPS65090_IRQ(0, 0),
+	[1]		= TPS65090_IRQ(0, 1),
+	[2]		= TPS65090_IRQ(0, 2),
+	[3]		= TPS65090_IRQ(0, 3),
+	[4]		= TPS65090_IRQ(0, 4),
+	[5]		= TPS65090_IRQ(0, 5),
+	[6]		= TPS65090_IRQ(0, 6),
+	[7]		= TPS65090_IRQ(0, 7),
+	[8]		= TPS65090_IRQ(1, 0),
+	[9]		= TPS65090_IRQ(1, 1),
+	[10]		= TPS65090_IRQ(1, 2),
+	[11]		= TPS65090_IRQ(1, 3),
+	[12]		= TPS65090_IRQ(1, 4),
+	[13]		= TPS65090_IRQ(1, 5),
+	[14]		= TPS65090_IRQ(1, 6),
+	[15]		= TPS65090_IRQ(1, 7),
+};
+
+static struct mfd_cell tps65090s[] = {
+	{
+		.name = "tps65910-pmic",
+	},
+};
+
+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->hwirq;
+	const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
+
+	tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
+		data->mask_pos);
+}
+
+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];
+
+	tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
+		data->mask_pos);
+}
+
+static void tps65090_irq_sync_unlock(struct irq_data *data)
+{
+	struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
+
+	mutex_unlock(&tps65090->irq_lock);
+}
+
+static irqreturn_t tps65090_irq(int irq, void *data)
+{
+	struct tps65090 *tps65090 = data;
+	int ret = 0;
+	u8 status = 0, mask = 0;
+	unsigned long int acks = 0;
+	int i;
+
+	for (i = 0; i < NUM_INT_REG; i++) {
+		ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask);
+		if (ret < 0) {
+			dev_err(tps65090->dev,
+				"failed to read mask reg [addr:%d]\n",
+				TPS65090_INT_MSK + i);
+			return IRQ_NONE;
+		}
+		ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i,
+			&status);
+		if (ret < 0) {
+			dev_err(tps65090->dev,
+				"failed to read status reg [addr:%d]\n",
+				 TPS65090_INT_STS + i);
+			return IRQ_NONE;
+		}
+		if (status) {
+			/* Ack only those interrupts which are not masked */
+			status &= (~mask);
+			ret = tps65090_write(tps65090->dev,
+					TPS65090_INT_STS + i, status);
+			if (ret < 0) {
+				dev_err(tps65090->dev,
+					"failed to write interrupt status\n");
+				return IRQ_NONE;
+			}
+			acks |= (status << (i * 8));
+		}
+	}
+
+	for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs))
+		handle_nested_irq(tps65090->irq_base + i);
+	return acks ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq,
+	int irq_base)
+{
+	int i, ret;
+
+	if (!irq_base) {
+		dev_err(tps65090->dev, "IRQ base not set\n");
+		return -EINVAL;
+	}
+
+	mutex_init(&tps65090->irq_lock);
+
+	for (i = 0; i < NUM_INT_REG; i++)
+		tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF);
+
+	for (i = 0; i < NUM_INT_REG; 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;
+
+	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 bool is_volatile_reg(struct device *dev, unsigned int reg)
+{
+	if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS))
+		return true;
+	else
+		return false;
+}
+
+static const struct regmap_config tps65090_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = TOTAL_NUM_REG,
+	.num_reg_defaults_raw = TOTAL_NUM_REG,
+	.cache_type = REGCACHE_RBTREE,
+	.volatile_reg = is_volatile_reg,
+};
+
+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 -EINVAL;
+	}
+
+	tps65090 = devm_kzalloc(&client->dev, sizeof(*tps65090), GFP_KERNEL);
+	if (!tps65090) {
+		dev_err(&client->dev, "mem alloc for tps65090 failed\n");
+		return -ENOMEM;
+	}
+
+	tps65090->dev = &client->dev;
+	i2c_set_clientdata(client, tps65090);
+
+	tps65090->rmap = devm_regmap_init_i2c(client, &tps65090_regmap_config);
+	if (IS_ERR(tps65090->rmap)) {
+		ret = PTR_ERR(tps65090->rmap);
+		dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
+		return ret;
+	}
+
+	if (client->irq) {
+		ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base);
+		if (ret) {
+			dev_err(&client->dev, "IRQ init failed with err: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
+		ARRAY_SIZE(tps65090s), NULL, 0);
+	if (ret) {
+		dev_err(&client->dev, "add mfd devices failed with err: %d\n",
+			ret);
+		goto err_irq_exit;
+	}
+
+	return 0;
+
+err_irq_exit:
+	if (client->irq)
+		free_irq(client->irq, tps65090);
+	return ret;
+}
+
+static int __devexit tps65090_i2c_remove(struct i2c_client *client)
+{
+	struct tps65090 *tps65090 = i2c_get_clientdata(client);
+
+	mfd_remove_devices(tps65090->dev);
+	if (client->irq)
+		free_irq(client->irq, tps65090);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tps65090_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	if (client->irq)
+		disable_irq(client->irq);
+	return 0;
+}
+
+static int tps65090_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	if (client->irq)
+		enable_irq(client->irq);
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops tps65090_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume)
+};
+
+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,
+		.pm	= &tps65090_pm_ops,
+	},
+	.probe		= tps65090_i2c_probe,
+	.remove		= __devexit_p(tps65090_i2c_remove),
+	.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_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
+MODULE_LICENSE("GPL v2");