mfd: Add AAT2870 mfd driver

Add mfd core driver for AnalogicTech AAT2870.
The AAT2870 is communication through I2C and contains backlight and
regulator components.

Signed-off-by: Jin Park <jinyoungp@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 181 insertions, 0 deletions

diff --git a/include/linux/mfd/aat2870.h b/include/linux/mfd/aat2870.h
new file mode 100644
index 000000000000..89212df05622
--- /dev/null
+++ b/include/linux/mfd/aat2870.h
@@ -0,0 +1,181 @@
+/*
+ * linux/include/linux/mfd/aat2870.h
+ *
+ * Copyright (c) 2011, NVIDIA Corporation.
+ * Author: Jin Park <jinyoungp@nvidia.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.
+ *
+ * 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 St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef __LINUX_MFD_AAT2870_H
+#define __LINUX_MFD_AAT2870_H
+
+#include <linux/debugfs.h>
+#include <linux/i2c.h>
+
+/* Register offsets */
+#define AAT2870_BL_CH_EN        0x00
+#define AAT2870_BLM             0x01
+#define AAT2870_BLS             0x02
+#define AAT2870_BL1             0x03
+#define AAT2870_BL2             0x04
+#define AAT2870_BL3             0x05
+#define AAT2870_BL4             0x06
+#define AAT2870_BL5             0x07
+#define AAT2870_BL6             0x08
+#define AAT2870_BL7             0x09
+#define AAT2870_BL8             0x0A
+#define AAT2870_FLR             0x0B
+#define AAT2870_FM              0x0C
+#define AAT2870_FS              0x0D
+#define AAT2870_ALS_CFG0        0x0E
+#define AAT2870_ALS_CFG1        0x0F
+#define AAT2870_ALS_CFG2        0x10
+#define AAT2870_AMB             0x11
+#define AAT2870_ALS0            0x12
+#define AAT2870_ALS1            0x13
+#define AAT2870_ALS2            0x14
+#define AAT2870_ALS3            0x15
+#define AAT2870_ALS4            0x16
+#define AAT2870_ALS5            0x17
+#define AAT2870_ALS6            0x18
+#define AAT2870_ALS7            0x19
+#define AAT2870_ALS8            0x1A
+#define AAT2870_ALS9            0x1B
+#define AAT2870_ALSA            0x1C
+#define AAT2870_ALSB            0x1D
+#define AAT2870_ALSC            0x1E
+#define AAT2870_ALSD            0x1F
+#define AAT2870_ALSE            0x20
+#define AAT2870_ALSF            0x21
+#define AAT2870_SUB_SET         0x22
+#define AAT2870_SUB_CTRL        0x23
+#define AAT2870_LDO_AB          0x24
+#define AAT2870_LDO_CD          0x25
+#define AAT2870_LDO_EN          0x26
+#define AAT2870_REG_NUM         0x27
+
+/* Device IDs */
+enum aat2870_id {
+        AAT2870_ID_BL,
+        AAT2870_ID_LDOA,
+        AAT2870_ID_LDOB,
+        AAT2870_ID_LDOC,
+        AAT2870_ID_LDOD
+};
+
+/* Backlight channels */
+#define AAT2870_BL_CH1          0x01
+#define AAT2870_BL_CH2          0x02
+#define AAT2870_BL_CH3          0x04
+#define AAT2870_BL_CH4          0x08
+#define AAT2870_BL_CH5          0x10
+#define AAT2870_BL_CH6          0x20
+#define AAT2870_BL_CH7          0x40
+#define AAT2870_BL_CH8          0x80
+#define AAT2870_BL_CH_ALL       0xFF
+
+/* Backlight current magnitude (mA) */
+enum aat2870_current {
+        AAT2870_CURRENT_0_45,
+        AAT2870_CURRENT_0_90,
+        AAT2870_CURRENT_1_80,
+        AAT2870_CURRENT_2_70,
+        AAT2870_CURRENT_3_60,
+        AAT2870_CURRENT_4_50,
+        AAT2870_CURRENT_5_40,
+        AAT2870_CURRENT_6_30,
+        AAT2870_CURRENT_7_20,
+        AAT2870_CURRENT_8_10,
+        AAT2870_CURRENT_9_00,
+        AAT2870_CURRENT_9_90,
+        AAT2870_CURRENT_10_8,
+        AAT2870_CURRENT_11_7,
+        AAT2870_CURRENT_12_6,
+        AAT2870_CURRENT_13_5,
+        AAT2870_CURRENT_14_4,
+        AAT2870_CURRENT_15_3,
+        AAT2870_CURRENT_16_2,
+        AAT2870_CURRENT_17_1,
+        AAT2870_CURRENT_18_0,
+        AAT2870_CURRENT_18_9,
+        AAT2870_CURRENT_19_8,
+        AAT2870_CURRENT_20_7,
+        AAT2870_CURRENT_21_6,
+        AAT2870_CURRENT_22_5,
+        AAT2870_CURRENT_23_4,
+        AAT2870_CURRENT_24_3,
+        AAT2870_CURRENT_25_2,
+        AAT2870_CURRENT_26_1,
+        AAT2870_CURRENT_27_0,
+        AAT2870_CURRENT_27_9
+};
+
+struct aat2870_register {
+        bool readable;
+        bool writeable;
+        u8 value;
+};
+
+struct aat2870_data {
+        struct device *dev;
+        struct i2c_client *client;
+
+        struct mutex io_lock;
+        struct aat2870_register *reg_cache; /* register cache */
+        int en_pin; /* enable GPIO pin (if < 0, ignore this value) */
+        bool is_enable;
+
+        /* init and uninit for platform specified */
+        int (*init)(struct aat2870_data *aat2870);
+        void (*uninit)(struct aat2870_data *aat2870);
+
+        /* i2c io funcntions */
+        int (*read)(struct aat2870_data *aat2870, u8 addr, u8 *val);
+        int (*write)(struct aat2870_data *aat2870, u8 addr, u8 val);
+        int (*update)(struct aat2870_data *aat2870, u8 addr, u8 mask, u8 val);
+
+        /* for debugfs */
+        struct dentry *dentry_root;
+        struct dentry *dentry_reg;
+};
+
+struct aat2870_subdev_info {
+        int id;
+        const char *name;
+        void *platform_data;
+};
+
+struct aat2870_platform_data {
+        int en_pin; /* enable GPIO pin (if < 0, ignore this value) */
+
+        struct aat2870_subdev_info *subdevs;
+        int num_subdevs;
+
+        /* init and uninit for platform specified */
+        int (*init)(struct aat2870_data *aat2870);
+        void (*uninit)(struct aat2870_data *aat2870);
+};
+
+struct aat2870_bl_platform_data {
+        /* backlight channels, default is AAT2870_BL_CH_ALL */
+        int channels;
+        /* backlight current magnitude, default is AAT2870_CURRENT_27_9 */
+        int max_current;
+        /* maximum brightness, default is 255 */
+        int max_brightness;
+};
+
+#endif /* __LINUX_MFD_AAT2870_H */