[PATCH 1/5] lmp92001: mfd: Add support TI LMP92001

From: s . abhisit
Date: Wed Aug 30 2017 - 14:07:34 EST

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From: Abhisit Sangjan <s.abhisit@xxxxxxxxx>

TI LMP92001 Analog System Monitor and Controller

8-bit GPIOs.
12 DACs with 12-bit resolution.

The GPIOs and DACs are shared port function with Cy function pin to
take control the pin suddenly from external hardware.
DAC's referance voltage selectable for Internal/External.

16 + 1 ADCs with 12-bit resolution.

Built-in internal Temperature Sensor on channel 17.
Window Comparator Function is supported on channel 1-3 and 9-11 for
monitoring with interrupt signal (pending to implement for interrupt).
ADC's referance voltage selectable for Internal/External.

Signed-off-by: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
---
drivers/mfd/Kconfig | 12 ++
drivers/mfd/Makefile | 4 +
drivers/mfd/lmp92001-core.c | 307 +++++++++++++++++++++++++++++++++++++
drivers/mfd/lmp92001-debug.c | 64 ++++++++
drivers/mfd/lmp92001-i2c.c | 211 +++++++++++++++++++++++++
include/linux/mfd/lmp92001/core.h | 135 ++++++++++++++++
include/linux/mfd/lmp92001/debug.h | 27 ++++
7 files changed, 760 insertions(+)
create mode 100644 drivers/mfd/lmp92001-core.c
create mode 100644 drivers/mfd/lmp92001-debug.c
create mode 100644 drivers/mfd/lmp92001-i2c.c
create mode 100644 include/linux/mfd/lmp92001/core.h
create mode 100644 include/linux/mfd/lmp92001/debug.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 94ad2c1c3d90..a20389a30cf8 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1528,6 +1528,18 @@ config MFD_LM3533
additional drivers must be enabled in order to use the LED,
backlight or ambient-light-sensor functionality of the device.

+config MFD_LMP92001
+ tristate "TI LMP92001 Analog System Monitor and Controller"
+ depends on I2C
+ select MFD_CORE
+ select REGMAP_I2C
+ help
+ Say yes here to enable support for TI LMP92001 Analog System
+ Monitor and Controller
+
+ This driver provide support for 16 ADC, 12 DAC, Voltage Reference,
+ Analog Temperature Sensor and 8-bit GPIO Port.
+
config MFD_TIMBERDALE
tristate "Timberdale FPGA"
select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 080793b3fd0e..20d2e65d503a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -199,6 +199,10 @@ obj-$(CONFIG_MFD_RN5T618) += rn5t618.o
obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o
obj-$(CONFIG_MFD_SYSCON) += syscon.o
obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o
+
+lmp92001-objs := lmp92001-core.o lmp92001-i2c.o lmp92001-debug.o
+obj-$(CONFIG_MFD_LMP92001) += lmp92001.o
+
obj-$(CONFIG_MFD_VEXPRESS_SYSREG) += vexpress-sysreg.o
obj-$(CONFIG_MFD_RETU) += retu-mfd.o
obj-$(CONFIG_MFD_AS3711) += as3711.o
diff --git a/drivers/mfd/lmp92001-core.c b/drivers/mfd/lmp92001-core.c
new file mode 100644
index 000000000000..5ee315ce61bb
--- /dev/null
+++ b/drivers/mfd/lmp92001-core.c
@@ -0,0 +1,307 @@
+/*
+ * lmp92001-core.c - Device access for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
+ *
+ * Inspired by wm831x driver.
+ *
+ * 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.
+ */
+
+#include <linux/mfd/lmp92001/core.h>
+#include <linux/mfd/lmp92001/debug.h>
+
+static const struct mfd_cell lmp92001_devs[] = {
+ {
+ .name = "lmp92001-gpio",
+ .of_compatible = "ti,lmp92001-gpio",
+ },
+ {
+ .name = "lmp92001-adc",
+ .of_compatible = "ti,lmp92001-adc",
+ },
+ {
+ .name = "lmp92001-dac",
+ .of_compatible = "ti,lmp92001-dac",
+ },
+};
+
+static struct reg_default lmp92001_defaults[] = {
+ { LMP92001_SGEN, 0x40 },
+ { LMP92001_SHIL, 0x00 },
+ { LMP92001_SLOL, 0x00 },
+ { LMP92001_CGEN, 0x00 },
+ { LMP92001_CDAC, 0x03 },
+ { LMP92001_CGPO, 0xFF },
+ { LMP92001_CINH, 0x00 },
+ { LMP92001_CINL, 0x00 },
+ { LMP92001_CAD1, 0x00 },
+ { LMP92001_CAD2, 0x00 },
+ { LMP92001_CAD3, 0x00 },
+ { LMP92001_CTRIG, 0x00 },
+ { LMP92001_CREF, 0x07 },
+ { LMP92001_ADC1, 0x0000 },
+ { LMP92001_ADC2, 0x0000 },
+ { LMP92001_ADC3, 0x0000 },
+ { LMP92001_ADC4, 0x0000 },
+ { LMP92001_ADC5, 0x0000 },
+ { LMP92001_ADC6, 0x0000 },
+ { LMP92001_ADC7, 0x0000 },
+ { LMP92001_ADC8, 0x0000 },
+ { LMP92001_ADC9, 0x0000 },
+ { LMP92001_ADC10, 0x0000 },
+ { LMP92001_ADC11, 0x0000 },
+ { LMP92001_ADC12, 0x0000 },
+ { LMP92001_ADC13, 0x0000 },
+ { LMP92001_ADC14, 0x0000 },
+ { LMP92001_ADC15, 0x0000 },
+ { LMP92001_ADC16, 0x0000 },
+ { LMP92001_LIH1, 0x0FFF },
+ { LMP92001_LIH2, 0x0FFF },
+ { LMP92001_LIH3, 0x0FFF },
+ { LMP92001_LIH9, 0x0FFF },
+ { LMP92001_LIH10, 0x0FFF },
+ { LMP92001_LIH11, 0x0FFF },
+ { LMP92001_LIL1, 0x0000 },
+ { LMP92001_LIL2, 0x0000 },
+ { LMP92001_LIL3, 0x0000 },
+ { LMP92001_LIL9, 0x0000 },
+ { LMP92001_LIL10, 0x0000 },
+ { LMP92001_LIL11, 0x0000 },
+ { LMP92001_DAC1, 0x0000 },
+ { LMP92001_DAC2, 0x0000 },
+ { LMP92001_DAC3, 0x0000 },
+ { LMP92001_DAC4, 0x0000 },
+ { LMP92001_DAC5, 0x0000 },
+ { LMP92001_DAC6, 0x0000 },
+ { LMP92001_DAC7, 0x0000 },
+ { LMP92001_DAC8, 0x0000 },
+ { LMP92001_DAC9, 0x0000 },
+ { LMP92001_DAC10, 0x0000 },
+ { LMP92001_DAC11, 0x0000 },
+ { LMP92001_DAC12, 0x0000 },
+ { LMP92001_DALL, 0x0000 },
+};
+
+static bool lmp92001_reg_readable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMP92001_ID:
+ case LMP92001_VER:
+ case LMP92001_SGEN:
+ case LMP92001_SGPI:
+ case LMP92001_SHIL:
+ case LMP92001_SLOL:
+ case LMP92001_CGEN:
+ case LMP92001_CDAC:
+ case LMP92001_CGPO:
+ case LMP92001_CINH:
+ case LMP92001_CINL:
+ case LMP92001_CAD1:
+ case LMP92001_CAD2:
+ case LMP92001_CAD3:
+ case LMP92001_ADC1:
+ case LMP92001_ADC2:
+ case LMP92001_ADC3:
+ case LMP92001_ADC4:
+ case LMP92001_ADC5:
+ case LMP92001_ADC6:
+ case LMP92001_ADC7:
+ case LMP92001_ADC8:
+ case LMP92001_ADC9:
+ case LMP92001_ADC10:
+ case LMP92001_ADC11:
+ case LMP92001_ADC12:
+ case LMP92001_ADC13:
+ case LMP92001_ADC14:
+ case LMP92001_ADC15:
+ case LMP92001_ADC16:
+ case LMP92001_ADC17:
+ case LMP92001_LIH1:
+ case LMP92001_LIH2:
+ case LMP92001_LIH3:
+ case LMP92001_LIH9:
+ case LMP92001_LIH10:
+ case LMP92001_LIH11:
+ case LMP92001_LIL1:
+ case LMP92001_LIL2:
+ case LMP92001_LIL3:
+ case LMP92001_LIL9:
+ case LMP92001_LIL10:
+ case LMP92001_LIL11:
+ case LMP92001_CREF:
+ case LMP92001_DAC1:
+ case LMP92001_DAC2:
+ case LMP92001_DAC3:
+ case LMP92001_DAC4:
+ case LMP92001_DAC5:
+ case LMP92001_DAC6:
+ case LMP92001_DAC7:
+ case LMP92001_DAC8:
+ case LMP92001_DAC9:
+ case LMP92001_DAC10:
+ case LMP92001_DAC11:
+ case LMP92001_DAC12:
+ case LMP92001_BLK0:
+ case LMP92001_BLK1:
+ case LMP92001_BLK2:
+ case LMP92001_BLK3:
+ case LMP92001_BLK4:
+ case LMP92001_BLK5:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool lmp92001_reg_writeable(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMP92001_CGEN:
+ case LMP92001_CDAC:
+ case LMP92001_CGPO:
+ case LMP92001_CINH:
+ case LMP92001_CINL:
+ case LMP92001_CAD1:
+ case LMP92001_CAD2:
+ case LMP92001_CAD3:
+ case LMP92001_CTRIG:
+ case LMP92001_LIH1:
+ case LMP92001_LIH2:
+ case LMP92001_LIH3:
+ case LMP92001_LIH9:
+ case LMP92001_LIH10:
+ case LMP92001_LIH11:
+ case LMP92001_LIL1:
+ case LMP92001_LIL2:
+ case LMP92001_LIL3:
+ case LMP92001_LIL9:
+ case LMP92001_LIL10:
+ case LMP92001_LIL11:
+ case LMP92001_CREF:
+ case LMP92001_DAC1:
+ case LMP92001_DAC2:
+ case LMP92001_DAC3:
+ case LMP92001_DAC4:
+ case LMP92001_DAC5:
+ case LMP92001_DAC6:
+ case LMP92001_DAC7:
+ case LMP92001_DAC8:
+ case LMP92001_DAC9:
+ case LMP92001_DAC10:
+ case LMP92001_DAC11:
+ case LMP92001_DAC12:
+ case LMP92001_DALL:
+ case LMP92001_BLK0:
+ case LMP92001_BLK1:
+ case LMP92001_BLK4:
+ case LMP92001_BLK5:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool lmp92001_reg_volatile(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case LMP92001_SGEN:
+ case LMP92001_SGPI:
+ case LMP92001_SHIL:
+ case LMP92001_SLOL:
+ case LMP92001_CGEN:
+ case LMP92001_ADC1:
+ case LMP92001_ADC2:
+ case LMP92001_ADC3:
+ case LMP92001_ADC4:
+ case LMP92001_ADC5:
+ case LMP92001_ADC6:
+ case LMP92001_ADC7:
+ case LMP92001_ADC8:
+ case LMP92001_ADC9:
+ case LMP92001_ADC10:
+ case LMP92001_ADC11:
+ case LMP92001_ADC12:
+ case LMP92001_ADC13:
+ case LMP92001_ADC14:
+ case LMP92001_ADC15:
+ case LMP92001_ADC16:
+ case LMP92001_ADC17:
+ case LMP92001_BLK2:
+ case LMP92001_BLK3:
+ return true;
+ default:
+ return false;
+ }
+}
+
+struct regmap_config lmp92001_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+
+ .cache_type = REGCACHE_RBTREE,
+
+ .reg_defaults = lmp92001_defaults,
+ .num_reg_defaults = ARRAY_SIZE(lmp92001_defaults),
+
+ .max_register = LMP92001_BLK5,
+ .readable_reg = lmp92001_reg_readable,
+ .writeable_reg = lmp92001_reg_writeable,
+ .volatile_reg = lmp92001_reg_volatile,
+};
+
+int lmp92001_device_init(struct lmp92001 *lmp92001, unsigned long id, int irq)
+{
+ int ret;
+ unsigned int comid, ver;
+
+ dev_set_drvdata(lmp92001->dev, lmp92001);
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_ID, &comid);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Company ID: %d\n", ret);
+ goto exit;
+ }
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_VER, &ver);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Version: %d\n", ret);
+ goto exit;
+ }
+
+ dev_info(lmp92001->dev, "Company ID 0x%.2x, Version 0x%.2x\n",
+ comid, ver);
+
+ ret = mfd_add_devices(lmp92001->dev, PLATFORM_DEVID_AUTO,
+ lmp92001_devs, ARRAY_SIZE(lmp92001_devs),
+ NULL, 0, NULL);
+ if (ret != 0) {
+ dev_err(lmp92001->dev, "failed to add children\n");
+ goto exit;
+ }
+
+ ret = lmp92001_debug_init(lmp92001);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to initial debug fs.\n");
+ goto exit;
+ }
+
+exit:
+ return ret;
+}
+
+void lmp92001_device_exit(struct lmp92001 *lmp92001)
+{
+ lmp92001_debug_exit(lmp92001);
+ mfd_remove_devices(lmp92001->dev);
+}
diff --git a/drivers/mfd/lmp92001-debug.c b/drivers/mfd/lmp92001-debug.c
new file mode 100644
index 000000000000..b1746dc810b3
--- /dev/null
+++ b/drivers/mfd/lmp92001-debug.c
@@ -0,0 +1,64 @@
+/*
+ * lmp92001-debug.c - Debug file system for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
+ *
+ * Inspired by wm831x driver.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+static ssize_t lmp92001_id_ver_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct lmp92001 *lmp92001 = dev_get_drvdata(dev);
+ int ret;
+ unsigned int comid, ver;
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_ID, &comid);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Company ID: %d\n", ret);
+ return ret;
+ }
+
+ ret = regmap_read(lmp92001->regmap, LMP92001_VER, &ver);
+ if (ret < 0) {
+ dev_err(lmp92001->dev, "failed to read Version: %d\n", ret);
+ return ret;
+ }
+
+ return sprintf(buf, "Company ID 0x%02x (%d), Version 0x%02x (%d)\n",
+ comid, comid, ver, ver);
+}
+static DEVICE_ATTR(lmp92001_id_ver, 0444, lmp92001_id_ver_show, NULL);
+
+int lmp92001_debug_init(struct lmp92001 *lmp92001)
+{
+ int ret;
+
+ ret = device_create_file(lmp92001->dev, &dev_attr_lmp92001_id_ver);
+ if (ret != 0)
+ dev_err(lmp92001->dev,
+ "unique ID attribute is not created: %d\n", ret);
+
+ return ret;
+}
+
+void lmp92001_debug_exit(struct lmp92001 *lmp92001)
+{
+ device_remove_file(lmp92001->dev, &dev_attr_lmp92001_id_ver);
+}
diff --git a/drivers/mfd/lmp92001-i2c.c b/drivers/mfd/lmp92001-i2c.c
new file mode 100644
index 000000000000..e22ea88f5820
--- /dev/null
+++ b/drivers/mfd/lmp92001-i2c.c
@@ -0,0 +1,211 @@
+/*
+ * lmp92001-i2c.c - I2C access for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
+ *
+ * Inspired by wm831x driver.
+ *
+ * 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.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/lmp92001/core.h>
+
+static const unsigned short lmp92001_i2c_addresses[] = {
+ 0x40, 0x42, 0x44, 0x46, 0x48, 0x4A, 0x4C, 0x4E, 0x50, I2C_CLIENT_END
+};
+
+/* TODO: To read/write block access, it may need to re-ordering endianness! */
+static int lmp92001_reg_read(void *context, unsigned int reg, unsigned int *val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+ int ret;
+
+ if (reg > 0xff)
+ return -EINVAL;
+
+ switch (reg) {
+ case LMP92001_ID ... LMP92001_CTRIG:
+ case LMP92001_CREF:
+ *val = ret = i2c_smbus_read_byte_data(i2c, reg);
+ break;
+ case LMP92001_ADC1 ... LMP92001_LIL11:
+ case LMP92001_DAC1 ... LMP92001_DALL:
+ *val = ret = i2c_smbus_read_word_swapped(i2c, reg);
+ break;
+ case LMP92001_BLK0 ... LMP92001_BLK5:
+ ret = i2c_smbus_read_block_data(i2c, reg,
+ (u8 *)((uintptr_t)*val));
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int lmp92001_reg_write(void *context, unsigned int reg, unsigned int val)
+{
+ struct device *dev = context;
+ struct i2c_client *i2c = to_i2c_client(dev);
+ int ret;
+
+ if (reg > 0xff)
+ return -EINVAL;
+
+ switch (reg) {
+ case LMP92001_ID ... LMP92001_CTRIG:
+ case LMP92001_CREF:
+ ret = i2c_smbus_write_byte_data(i2c, reg, val);
+ break;
+ case LMP92001_ADC1 ... LMP92001_LIL11:
+ case LMP92001_DAC1 ... LMP92001_DALL:
+ ret = i2c_smbus_write_word_swapped(i2c, reg, val);
+ break;
+ /* To call this function/case, must be passed val as pointer */
+ case LMP92001_BLK0:
+ case LMP92001_BLK4:
+ ret = i2c_smbus_write_block_data(i2c, reg, 24,
+ (u8 *)((uintptr_t)val));
+ break;
+ case LMP92001_BLK1:
+ case LMP92001_BLK5:
+ ret = i2c_smbus_write_block_data(i2c, reg, 12,
+ (u8 *)((uintptr_t)val));
+ break;
+ case LMP92001_BLK2:
+ ret = i2c_smbus_write_block_data(i2c, reg, 34,
+ (u8 *)((uintptr_t)val));
+ break;
+ case LMP92001_BLK3:
+ ret = i2c_smbus_write_block_data(i2c, reg, 18,
+ (u8 *)((uintptr_t)val));
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int lmp92001_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct lmp92001 *lmp92001;
+ int ret;
+
+ lmp92001 = devm_kzalloc(&i2c->dev, sizeof(struct lmp92001), GFP_KERNEL);
+ if (!lmp92001)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, lmp92001);
+ lmp92001->dev = &i2c->dev;
+
+ lmp92001_regmap_config.reg_read = lmp92001_reg_read;
+ lmp92001_regmap_config.reg_write = lmp92001_reg_write;
+
+ lmp92001->regmap = devm_regmap_init(&i2c->dev, NULL, &i2c->dev,
+ &lmp92001_regmap_config);
+ if (IS_ERR(lmp92001->regmap)) {
+ ret = PTR_ERR(lmp92001->regmap);
+ dev_err(lmp92001->dev, "failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ return lmp92001_device_init(lmp92001, id->driver_data, i2c->irq);
+}
+
+static int lmp92001_i2c_remove(struct i2c_client *i2c)
+{
+ struct lmp92001 *lmp92001 = i2c_get_clientdata(i2c);
+
+ lmp92001_device_exit(lmp92001);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id lmp92001_dt_ids[] = {
+ { .compatible = "ti,lmp92001", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, lmp92001_dt_ids);
+#endif
+
+static const struct i2c_device_id lmp92001_i2c_ids[] = {
+ { "lmp92001" },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, lmp92001_i2c_ids);
+
+static int lmp92001_i2c_detect(struct i2c_client *i2c,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = i2c->adapter;
+ s32 comid, ver;
+
+ if (!i2c_check_functionality(adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA))
+ return -ENODEV;
+
+ comid = i2c_smbus_read_byte_data(i2c, LMP92001_ID);
+ ver = i2c_smbus_read_byte_data(i2c, LMP92001_VER);
+
+ if (comid != 0x01 || ver != 0x10)
+ return -ENODEV;
+
+ return 0;
+}
+
+static struct i2c_driver lmp92001_i2c_driver = {
+ .driver = {
+ .name = "lmp92001",
+ .of_match_table = of_match_ptr(lmp92001_dt_ids),
+ },
+ .probe = lmp92001_i2c_probe,
+ .remove = lmp92001_i2c_remove,
+ .id_table = lmp92001_i2c_ids,
+ .detect = lmp92001_i2c_detect,
+ .address_list = lmp92001_i2c_addresses,
+};
+
+static int __init lmp92001_i2c_init(void)
+{
+ return i2c_add_driver(&lmp92001_i2c_driver);
+}
+subsys_initcall(lmp92001_i2c_init);
+
+static void __exit lmp92001_i2c_exit(void)
+{
+ i2c_del_driver(&lmp92001_i2c_driver);
+}
+module_exit(lmp92001_i2c_exit);
+
+MODULE_DESCRIPTION("i2c driver for TI LMP92001");
+MODULE_AUTHOR("Abhisit Sangjan <s.abhisit@xxxxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/lmp92001/core.h b/include/linux/mfd/lmp92001/core.h
new file mode 100644
index 000000000000..81aabf8b8e7a
--- /dev/null
+++ b/include/linux/mfd/lmp92001/core.h
@@ -0,0 +1,135 @@
+/*
+ * include/linux/mfd/lmp92001/core.h - Core interface for TI LMP92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
+ *
+ * Inspired by wm831x driver.
+ *
+ * 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.
+ */
+
+#ifndef __MFD_LMP92001_CORE_H__
+#define __MFD_LMP92001_CORE_H__
+
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+/*
+ * Register values.
+ */
+/* ID */
+#define LMP92001_ID 0x0E
+#define LMP92001_VER 0x0F
+/* STATUS */
+#define LMP92001_SGEN 0x10
+#define LMP92001_SGPI 0x11
+#define LMP92001_SHIL 0x12
+#define LMP92001_SLOL 0x13
+/* CONTROL */
+#define LMP92001_CGEN 0x14
+#define LMP92001_CDAC 0x15
+#define LMP92001_CGPO 0x16
+#define LMP92001_CINH 0x17
+#define LMP92001_CINL 0x18
+#define LMP92001_CAD1 0x19
+#define LMP92001_CAD2 0x1A
+#define LMP92001_CAD3 0x1B
+#define LMP92001_CTRIG 0x1C
+/* ADC OUTPUT DATA */
+#define LMP92001_ADC1 0x20
+#define LMP92001_ADC2 0x21
+#define LMP92001_ADC3 0x22
+#define LMP92001_ADC4 0x23
+#define LMP92001_ADC5 0x24
+#define LMP92001_ADC6 0x25
+#define LMP92001_ADC7 0x26
+#define LMP92001_ADC8 0x27
+#define LMP92001_ADC9 0x28
+#define LMP92001_ADC10 0x29
+#define LMP92001_ADC11 0x2A
+#define LMP92001_ADC12 0x2B
+#define LMP92001_ADC13 0x2C
+#define LMP92001_ADC14 0x2D
+#define LMP92001_ADC15 0x2E
+#define LMP92001_ADC16 0x2F
+#define LMP92001_ADC17 0x30
+/* ADC WINDOW COMPARATOR LIMITS */
+#define LMP92001_LIH1 0x40
+#define LMP92001_LIH2 0x41
+#define LMP92001_LIH3 0x42
+#define LMP92001_LIH9 0x43
+#define LMP92001_LIH10 0x44
+#define LMP92001_LIH11 0x45
+#define LMP92001_LIL1 0x46
+#define LMP92001_LIL2 0x47
+#define LMP92001_LIL3 0x48
+#define LMP92001_LIL9 0x49
+#define LMP92001_LIL10 0x4A
+#define LMP92001_LIL11 0x4B
+/* INTERNAL REFERENCE CONTROL */
+#define LMP92001_CREF 0x66
+/* DAC INPUT DATA */
+#define LMP92001_DAC1 0x80
+#define LMP92001_DAC2 0x81
+#define LMP92001_DAC3 0x82
+#define LMP92001_DAC4 0x83
+#define LMP92001_DAC5 0x84
+#define LMP92001_DAC6 0x85
+#define LMP92001_DAC7 0x86
+#define LMP92001_DAC8 0x87
+#define LMP92001_DAC9 0x88
+#define LMP92001_DAC10 0x89
+#define LMP92001_DAC11 0x8A
+#define LMP92001_DAC12 0x8B
+#define LMP92001_DALL 0x90
+/* MEMORY MAPPED BLOCK COMMANDS */
+#define LMP92001_BLK0 0xF0
+#define LMP92001_BLK1 0xF1
+#define LMP92001_BLK2 0xF2
+#define LMP92001_BLK3 0xF3
+#define LMP92001_BLK4 0xF4
+#define LMP92001_BLK5 0xF5
+
+/*
+ * Helpful macros
+ */
+/* DAC */
+#define CDAC_OFF BIT(0)
+#define CDAC_OLVL BIT(1)
+#define CDAC_GANG BIT(2)
+/* INT. REFERANCE ENABLE */
+#define CREF_DEXT BIT(0)
+#define CREF_AEXT BIT(1)
+/* GENERAL */
+#define CGEN_STRT BIT(0)
+#define CGEN_LCK BIT(1)
+#define CGEN_RST BIT(7)
+/* STATUS: GENERNAL */
+#define SGEN_GPI BIT(0)
+
+struct lmp92001 {
+ struct device *dev;
+ struct regmap *regmap;
+
+ struct mutex adc_lock;
+ struct mutex dac_lock;
+};
+
+extern struct regmap_config lmp92001_regmap_config;
+
+int lmp92001_device_init(struct lmp92001 *lmp92001, unsigned long id, int irq);
+void lmp92001_device_exit(struct lmp92001 *lmp92001);
+
+#endif /* __MFD_LMP92001_CORE_H__ */
diff --git a/include/linux/mfd/lmp92001/debug.h b/include/linux/mfd/lmp92001/debug.h
new file mode 100644
index 000000000000..e6fda7efc917
--- /dev/null
+++ b/include/linux/mfd/lmp92001/debug.h
@@ -0,0 +1,27 @@
+/*
+ * include/linux/mfd/lmp92001/debug.h - Debug interface for TI 92001
+ *
+ * Copyright 2016-2017 Celestica Ltd.
+ *
+ * Author: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
+ *
+ * Inspired by wm831x driver.
+ *
+ * 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.
+ */
+
+#ifndef __MFD_LMP92001_DEBUG_H__
+#define __MFD_LMP92001_DEBUG_H__
+
+int lmp92001_debug_init(struct lmp92001 *lmp92001);
+void lmp92001_debug_exit(struct lmp92001 *lmp92001);
+
+#endif /* __MFD_LMP92001_DEBUG_H__ */
--
2.13.0

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