Regulators: Add max8907c and max8952

Add max8907c regulator and mfd driver.
Add max8952 regulator driver.

Original-Change-Id: If63b724647d887a8088da0f2deb8af91e4fe3cfa
Signed-off-by: Jin Park <jinyoungp@nvidia.com>
Reviewed-on: http://git-master/r/9902
Reviewed-by: Thomas Cherry <tcherry@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>

Rebase-Id: R01d66b7af18617a764bd378b7f71e6294ebcabc8

4 files changed, 445 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 21574bdf485f..a6c974292728 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -386,6 +386,16 @@ config MFD_MAX8998
 	  additional drivers must be enabled in order to use the functionality
 	  of the device.
 
+config MFD_MAX8907C
+	tristate "Maxim Semiconductor MAX8907C PMIC Support"
+	select MFD_CORE
+	depends on I2C
+	help
+	  Say yes here to support for Maxim Semiconductor MAX8907C. This is
+	  a Power Management IC. This driver provies common support for
+	  accessing the device, additional drivers must be enabled in order
+	  to use the functionality of the device.
+
 config MFD_WM8400
 	tristate "Support Wolfson Microelectronics WM8400"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index c58020303d18..ae6c2e7f8151 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -102,3 +102,4 @@ obj-$(CONFIG_MFD_PM8921_CORE) 	+= pm8921-core.o
 obj-$(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_MAX8907C)	+= max8907c.o
diff --git a/drivers/mfd/max8907c.c b/drivers/mfd/max8907c.c
new file mode 100644
index 000000000000..0ceccbab7e37
--- /dev/null
+++ b/drivers/mfd/max8907c.c
@@ -0,0 +1,251 @@
+/*
+ * max8907c.c - mfd driver for MAX8907c
+ *
+ * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max8907c.h>
+
+static struct mfd_cell cells[] = {
+	{.name = "max8907-regulator",},
+};
+
+int max8907c_reg_read(struct device *dev, u8 reg)
+{
+	struct i2c_client *i2c = to_i2c_client(dev);
+	struct max8907c *max8907c = dev_get_drvdata(dev);
+	u8 val;
+	int ret;
+
+	mutex_lock(&max8907c->io_lock);
+
+	ret = max8907c->read_dev(i2c, reg, 1, &val);
+
+	mutex_unlock(&max8907c->io_lock);
+	pr_debug("max8907c: reg read  reg=%x, val=%x\n",
+		 (unsigned int)reg, (unsigned int)val);
+
+	if (ret != 0)
+		pr_err("Failed to read max8907c I2C driver: %d\n", ret);
+	return val;
+}
+EXPORT_SYMBOL_GPL(max8907c_reg_read);
+
+int max8907c_reg_write(struct device *dev, u8 reg, u8 val)
+{
+	struct i2c_client *i2c = to_i2c_client(dev);
+	struct max8907c *max8907c = dev_get_drvdata(dev);
+	int ret;
+
+	pr_debug("max8907c: reg write  reg=%x, val=%x\n",
+		 (unsigned int)reg, (unsigned int)val);
+	mutex_lock(&max8907c->io_lock);
+
+	ret = max8907c->write_dev(i2c, reg, 1, &val);
+
+	mutex_unlock(&max8907c->io_lock);
+
+	if (ret != 0)
+		pr_err("Failed to write max8907c I2C driver: %d\n", ret);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(max8907c_reg_write);
+
+int max8907c_set_bits(struct device *dev, u8 reg, u8 mask, u8 val)
+{
+	struct i2c_client *i2c = to_i2c_client(dev);
+	struct max8907c *max8907c = dev_get_drvdata(dev);
+	u8 tmp;
+	int ret;
+
+	pr_debug("max8907c: reg write  reg=%02X, val=%02X, mask=%02X\n",
+		 (unsigned int)reg, (unsigned int)val, (unsigned int)mask);
+	mutex_lock(&max8907c->io_lock);
+
+	ret = max8907c->read_dev(i2c, reg, 1, &tmp);
+	if (ret == 0) {
+		val = (tmp & ~mask) | (val & mask);
+		ret = max8907c->write_dev(i2c, reg, 1, &val);
+	}
+
+	mutex_unlock(&max8907c->io_lock);
+
+	if (ret != 0)
+		pr_err("Failed to write max8907c I2C driver: %d\n", ret);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(max8907c_set_bits);
+
+static int max8907c_i2c_read(void *io_data, u8 reg, u8 count, u8 * dest)
+{
+	struct i2c_client *i2c = (struct i2c_client *)io_data;
+	struct i2c_msg xfer[2];
+	int ret = 0;
+
+	xfer[0].addr = i2c->addr;
+	xfer[0].flags = I2C_M_NOSTART;
+	xfer[0].len = 1;
+	xfer[0].buf = &reg;
+
+	xfer[1].addr = i2c->addr;
+	xfer[1].flags = I2C_M_RD;
+	xfer[1].len = count;
+	xfer[1].buf = dest;
+
+	ret = i2c_transfer(i2c->adapter, xfer, 2);
+	if (ret < 0)
+		return ret;
+	if (ret != 2)
+		return -EIO;
+
+	return 0;
+}
+
+static int max8907c_i2c_write(void *io_data, u8 reg, u8 count, const u8 * src)
+{
+	struct i2c_client *i2c = (struct i2c_client *)io_data;
+	u8 msg[0x100 + 1];
+	int ret = 0;
+
+	msg[0] = reg;
+	memcpy(&msg[1], src, count);
+
+	ret = i2c_master_send(i2c, msg, count + 1);
+	if (ret < 0)
+		return ret;
+	if (ret != count + 1)
+		return -EIO;
+
+	return 0;
+}
+
+static int max8907c_remove_subdev(struct device *dev, void *unused)
+{
+	platform_device_unregister(to_platform_device(dev));
+	return 0;
+}
+
+static int max8907c_remove_subdevs(struct max8907c *max8907c)
+{
+	return device_for_each_child(max8907c->dev, NULL,
+				     max8907c_remove_subdev);
+}
+
+static int max8097c_add_subdevs(struct max8907c *max8907c,
+				struct max8907c_platform_data *pdata)
+{
+	struct platform_device *pdev;
+	int ret;
+	int i;
+
+	for (i = 0; i < pdata->num_subdevs; i++) {
+		pdev = platform_device_alloc(pdata->subdevs[i]->name,
+					     pdata->subdevs[i]->id);
+
+		pdev->dev.parent = max8907c->dev;
+		pdev->dev.platform_data = pdata->subdevs[i]->dev.platform_data;
+
+		ret = platform_device_add(pdev);
+		if (ret)
+			goto error;
+	}
+	return 0;
+
+error:
+	max8907c_remove_subdevs(max8907c);
+	return ret;
+}
+
+static int max8907c_i2c_probe(struct i2c_client *i2c,
+			      const struct i2c_device_id *id)
+{
+	struct max8907c *max8907c;
+	struct max8907c_platform_data *pdata = i2c->dev.platform_data;
+	int ret;
+	int i;
+
+	max8907c = kzalloc(sizeof(struct max8907c), GFP_KERNEL);
+	if (max8907c == NULL)
+		return -ENOMEM;
+
+	max8907c->read_dev = max8907c_i2c_read;
+	max8907c->write_dev = max8907c_i2c_write;
+	max8907c->dev = &i2c->dev;
+	i2c_set_clientdata(i2c, max8907c);
+
+	mutex_init(&max8907c->io_lock);
+
+	for (i = 0; i < ARRAY_SIZE(cells); i++)
+		cells[i].driver_data = max8907c;
+	ret = mfd_add_devices(max8907c->dev, -1, cells, ARRAY_SIZE(cells),
+			      NULL, 0);
+	if (ret != 0) {
+		kfree(max8907c);
+		pr_debug("max8907c: failed to add MFD devices   %X\n", ret);
+		return ret;
+	}
+
+	ret = max8097c_add_subdevs(max8907c, pdata);
+
+	return ret;
+}
+
+static int max8907c_i2c_remove(struct i2c_client *i2c)
+{
+	struct max8907c *max8907c = i2c_get_clientdata(i2c);
+
+	mfd_remove_devices(max8907c->dev);
+	kfree(max8907c);
+
+	return 0;
+}
+
+static const struct i2c_device_id max8907c_i2c_id[] = {
+	{"max8907c", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, max8907c_i2c_id);
+
+static struct i2c_driver max8907c_i2c_driver = {
+	.driver = {
+		   .name = "max8907c",
+		   .owner = THIS_MODULE,
+		   },
+	.probe = max8907c_i2c_probe,
+	.remove = max8907c_i2c_remove,
+	.id_table = max8907c_i2c_id,
+};
+
+static int __init max8907c_i2c_init(void)
+{
+	int ret = -ENODEV;
+
+	ret = i2c_add_driver(&max8907c_i2c_driver);
+	if (ret != 0)
+		pr_err("Failed to register I2C driver: %d\n", ret);
+
+	return ret;
+}
+
+subsys_initcall(max8907c_i2c_init);
+
+static void __exit max8907c_i2c_exit(void)
+{
+	i2c_del_driver(&max8907c_i2c_driver);
+}
+
+module_exit(max8907c_i2c_exit);
+
+MODULE_DESCRIPTION("MAX8907C multi-function core driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/max8907c.h b/include/linux/mfd/max8907c.h
new file mode 100644
index 000000000000..c78849a32860
--- /dev/null
+++ b/include/linux/mfd/max8907c.h
@@ -0,0 +1,183 @@
+/* linux/mfd/max8907c.h
+ *
+ * Functions to access MAX8907C power management chip.
+ *
+ * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>
+ *
+ * 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.
+ */
+
+#ifndef __LINUX_MFD_MAX8907C_H
+#define __LINUX_MFD_MAX8907C_H
+
+/* MAX8907C register map */
+#define MAX8907C_REG_SYSENSEL               0x00
+#define MAX8907C_REG_ON_OFF_IRQ1            0x01
+#define MAX8907C_REG_ON_OFF_IRQ1_MASK       0x02
+#define MAX8907C_REG_ON_OFF_STAT            0x03
+#define MAX8907C_REG_SDCTL1                 0x04
+#define MAX8907C_REG_SDSEQCNT1              0x05
+#define MAX8907C_REG_SDV1                   0x06
+#define MAX8907C_REG_SDCTL2                 0x07
+#define MAX8907C_REG_SDSEQCNT2              0x08
+#define MAX8907C_REG_SDV2                   0x09
+#define MAX8907C_REG_SDCTL3                 0x0A
+#define MAX8907C_REG_SDSEQCNT3              0x0B
+#define MAX8907C_REG_SDV3                   0x0C
+#define MAX8907C_REG_ON_OFF_IRQ2            0x0D
+#define MAX8907C_REG_ON_OFF_IRQ2_MASK       0x0E
+#define MAX8907C_REG_RESET_CNFG             0x0F
+#define MAX8907C_REG_LDOCTL16               0x10
+#define MAX8907C_REG_LDOSEQCNT16            0x11
+#define MAX8907C_REG_LDO16VOUT              0x12
+#define MAX8907C_REG_SDBYSEQCNT             0x13
+#define MAX8907C_REG_LDOCTL17               0x14
+#define MAX8907C_REG_LDOSEQCNT17            0x15
+#define MAX8907C_REG_LDO17VOUT              0x16
+#define MAX8907C_REG_LDOCTL1                0x18
+#define MAX8907C_REG_LDOSEQCNT1             0x19
+#define MAX8907C_REG_LDO1VOUT               0x1A
+#define MAX8907C_REG_LDOCTL2                0x1C
+#define MAX8907C_REG_LDOSEQCNT2             0x1D
+#define MAX8907C_REG_LDO2VOUT               0x1E
+#define MAX8907C_REG_LDOCTL3                0x20
+#define MAX8907C_REG_LDOSEQCNT3             0x21
+#define MAX8907C_REG_LDO3VOUT               0x22
+#define MAX8907C_REG_LDOCTL4                0x24
+#define MAX8907C_REG_LDOSEQCNT4             0x25
+#define MAX8907C_REG_LDO4VOUT               0x26
+#define MAX8907C_REG_LDOCTL5                0x28
+#define MAX8907C_REG_LDOSEQCNT5             0x29
+#define MAX8907C_REG_LDO5VOUT               0x2A
+#define MAX8907C_REG_LDOCTL6                0x2C
+#define MAX8907C_REG_LDOSEQCNT6             0x2D
+#define MAX8907C_REG_LDO6VOUT               0x2E
+#define MAX8907C_REG_LDOCTL7                0x30
+#define MAX8907C_REG_LDOSEQCNT7             0x31
+#define MAX8907C_REG_LDO7VOUT               0x32
+#define MAX8907C_REG_LDOCTL8                0x34
+#define MAX8907C_REG_LDOSEQCNT8             0x35
+#define MAX8907C_REG_LDO8VOUT               0x36
+#define MAX8907C_REG_LDOCTL9                0x38
+#define MAX8907C_REG_LDOSEQCNT9             0x39
+#define MAX8907C_REG_LDO9VOUT               0x3A
+#define MAX8907C_REG_LDOCTL10               0x3C
+#define MAX8907C_REG_LDOSEQCNT10            0x3D
+#define MAX8907C_REG_LDO10VOUT              0x3E
+#define MAX8907C_REG_LDOCTL11               0x40
+#define MAX8907C_REG_LDOSEQCNT11            0x41
+#define MAX8907C_REG_LDO11VOUT              0x42
+#define MAX8907C_REG_LDOCTL12               0x44
+#define MAX8907C_REG_LDOSEQCNT12            0x45
+#define MAX8907C_REG_LDO12VOUT              0x46
+#define MAX8907C_REG_LDOCTL13               0x48
+#define MAX8907C_REG_LDOSEQCNT13            0x49
+#define MAX8907C_REG_LDO13VOUT              0x4A
+#define MAX8907C_REG_LDOCTL14               0x4C
+#define MAX8907C_REG_LDOSEQCNT14            0x4D
+#define MAX8907C_REG_LDO14VOUT              0x4E
+#define MAX8907C_REG_LDOCTL15               0x50
+#define MAX8907C_REG_LDOSEQCNT15            0x51
+#define MAX8907C_REG_LDO15VOUT              0x52
+#define MAX8907C_REG_OUT5VEN                0x54
+#define MAX8907C_REG_OUT5VSEQ               0x55
+#define MAX8907C_REG_OUT33VEN               0x58
+#define MAX8907C_REG_OUT33VSEQ              0x59
+#define MAX8907C_REG_LDOCTL19               0x5C
+#define MAX8907C_REG_LDOSEQCNT19            0x5D
+#define MAX8907C_REG_LDO19VOUT              0x5E
+#define MAX8907C_REG_LBCNFG                 0x60
+#define MAX8907C_REG_SEQ1CNFG               0x64
+#define MAX8907C_REG_SEQ2CNFG               0x65
+#define MAX8907C_REG_SEQ3CNFG               0x66
+#define MAX8907C_REG_SEQ4CNFG               0x67
+#define MAX8907C_REG_SEQ5CNFG               0x68
+#define MAX8907C_REG_SEQ6CNFG               0x69
+#define MAX8907C_REG_SEQ7CNFG               0x6A
+#define MAX8907C_REG_LDOCTL18               0x72
+#define MAX8907C_REG_LDOSEQCNT18            0x73
+#define MAX8907C_REG_LDO18VOUT              0x74
+#define MAX8907C_REG_BBAT_CNFG              0x78
+#define MAX8907C_REG_CHG_CNTL1              0x7C
+#define MAX8907C_REG_CHG_CNTL2              0x7D
+#define MAX8907C_REG_CHG_IRQ1               0x7E
+#define MAX8907C_REG_CHG_IRQ2               0x7F
+#define MAX8907C_REG_CHG_IRQ1_MASK          0x80
+#define MAX8907C_REG_CHG_IRQ2_MASK          0x81
+#define MAX8907C_REG_CHG_STAT               0x82
+#define MAX8907C_REG_WLED_MODE_CNTL         0x84
+#define MAX8907C_REG_ILED_CNTL              0x84
+#define MAX8907C_REG_II1RR                  0x8E
+#define MAX8907C_REG_II2RR                  0x8F
+#define MAX8907C_REG_LDOCTL20               0x9C
+#define MAX8907C_REG_LDOSEQCNT20            0x9D
+#define MAX8907C_REG_LDO20VOUT              0x9E
+
+/* RTC register */
+#define MAX8907C_REG_RTC_SEC                0x00
+#define MAX8907C_REG_RTC_MIN                0x01
+#define MAX8907C_REG_RTC_HOURS              0x02
+#define MAX8907C_REG_RTC_WEEKDAY            0x03
+#define MAX8907C_REG_RTC_DATE               0x04
+#define MAX8907C_REG_RTC_MONTH              0x05
+#define MAX8907C_REG_RTC_YEAR1              0x06
+#define MAX8907C_REG_RTC_YEAR2              0x07
+#define MAX8907C_REG_ALARM0_SEC             0x08
+#define MAX8907C_REG_ALARM0_MIN             0x09
+#define MAX8907C_REG_ALARM0_HOURS           0x0A
+#define MAX8907C_REG_ALARM0_WEEKDAY         0x0B
+#define MAX8907C_REG_ALARM0_DATE            0x0C
+#define MAX8907C_REG_ALARM0_MONTH           0x0D
+#define MAX8907C_REG_ALARM0_YEAR1           0x0E
+#define MAX8907C_REG_ALARM0_YEAR2           0x0F
+#define MAX8907C_REG_ALARM1_SEC             0x10
+#define MAX8907C_REG_ALARM1_MIN             0x11
+#define MAX8907C_REG_ALARM1_HOURS           0x12
+#define MAX8907C_REG_ALARM1_WEEKDAY         0x13
+#define MAX8907C_REG_ALARM1_DATE            0x14
+#define MAX8907C_REG_ALARM1_MONTH           0x15
+#define MAX8907C_REG_ALARM1_YEAR1           0x16
+#define MAX8907C_REG_ALARM1_YEAR2           0x17
+#define MAX8907C_REG_ALARM0_CNTL            0x18
+#define MAX8907C_REG_ALARM1_CNTL            0x19
+#define MAX8907C_REG_RTC_STATUS             0x1A
+#define MAX8907C_REG_RTC_CNTL               0x1B
+#define MAX8907C_REG_RTC_IRQ                0x1C
+#define MAX8907C_REG_IRQ_IRQ_MASK           0x1D
+#define MAX8907C_REG_MPL_CNTL               0x1E
+
+/* ADC and Touch Screen Controller register map */
+
+#define MAX8907C_CTL     0
+#define MAX8907C_SEQCNT  1
+#define MAX8907C_VOUT    2
+
+/* mask bit fields */
+#define MAX8907C_MASK_LDO_SEQ           0x1C
+#define MAX8907C_MASK_LDO_EN            0x01
+#define MAX8907C_MASK_VBBATTCV          0x03
+#define MAX8907C_MASK_OUT5V_VINEN       0x10
+#define MAX8907C_MASK_OUT5V_ENSRC       0x0E
+#define MAX8907C_MASK_OUT5V_EN          0x01
+
+struct max8907c {
+	struct device *dev;
+
+	int (*read_dev) (void *io_data, u8 reg, u8 count, u8 * dst);
+	int (*write_dev) (void *io_data, u8 reg, u8 count, const u8 * src);
+
+	struct mutex io_lock;
+};
+
+struct max8907c_platform_data {
+	int num_subdevs;
+	struct platform_device **subdevs;
+};
+
+int max8907c_reg_read(struct device *dev, u8 reg);
+int max8907c_reg_write(struct device *dev, u8 reg, u8 val);
+int max8907c_set_bits(struct device *dev, u8 reg, u8 mask, u8 val);
+
+#endif