RE: [PATCH 1/1] aat2870: Adding backlight, regulator and mfd driver

Jin Park
2011-05-31T04:25:54Z

Joe, thanks for your code review.

Samuel,
Re-sending the driver what applied Joe's comment.
Please review the driver.

Thanks,
Jinyoung.

Adding backlight, regulator and mfd driver for AnalogicTech AAT2870.

Signed-off-by: Jin Park <jinyoungp@nvidia.com>
---
drivers/mfd/Kconfig | 10 +
drivers/mfd/Makefile | 1 +
drivers/mfd/aat2870-core.c | 532 +++++++++++++++++++++++++++++++++
drivers/regulator/Kconfig | 7 +
drivers/regulator/Makefile | 1 +
drivers/regulator/aat2870-regulator.c | 265 ++++++++++++++++
drivers/video/backlight/Kconfig | 7 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/aat2870_bl.c | 246 +++++++++++++++
include/linux/mfd/aat2870.h | 182 +++++++++++
10 files changed, 1252 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/aat2870-core.c
create mode 100644 drivers/regulator/aat2870-regulator.c
create mode 100644 drivers/video/backlight/aat2870_bl.c
create mode 100644 include/linux/mfd/aat2870.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 0f09c05..6039ba2 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -728,6 +728,16 @@ config MFD_TPS65910
if you say yes here you get support for the TPS65910 series of
Power Management chips.

+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.
+ This driver provides common support for accessing the device,
+ additional drivers must be enabled in order to use the
+ functionality of the device.
+
endif # MFD_SUPPORT

menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index efe3cc3..498eb42 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -94,3 +94,4 @@ obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
obj-$(CONFIG_MFD_PM8921_CORE) += pm8921-core.o
obj-$(CONFIG_MFD_PM8XXX_IRQ) += pm8xxx-irq.o
obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-irq.o
+obj-$(CONFIG_MFD_AAT2870_CORE) += aat2870-core.o
diff --git a/drivers/mfd/aat2870-core.c b/drivers/mfd/aat2870-core.c
new file mode 100644
index 0000000..0d9687a
--- /dev/null
+++ b/drivers/mfd/aat2870-core.c
@@ -0,0 +1,532 @@
+/*
+ * linux/drivers/mfd/aat2870-core.c
+ *
+ * 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
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/aat2870.h>
+#include <linux/regulator/machine.h>
+
+static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
+ /* readable, writeable, value */
+ { 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */
+ { 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */
+ { 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */
+ { 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */
+ { 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */
+ { 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */
+ { 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */
+ { 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */
+ { 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */
+ { 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */
+ { 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */
+ { 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */
+ { 0, 1, 0x03 }, /* 0x0C AAT2870_FM */
+ { 0, 1, 0x03 }, /* 0x0D AAT2870_FS */
+ { 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */
+ { 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */
+ { 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */
+ { 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */
+ { 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */
+ { 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */
+ { 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */
+ { 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */
+ { 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */
+ { 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */
+ { 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */
+ { 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */
+ { 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */
+ { 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */
+ { 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */
+ { 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */
+ { 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */
+ { 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */
+ { 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */
+ { 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */
+ { 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */
+ { 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */
+ { 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */
+ { 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */
+ { 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */
+};
+
+static struct mfd_cell aat2870_devs[] = {
+ {
+ .name = "aat2870-backlight",
+ .id = AAT2870_ID_BL,
+ .pdata_size = sizeof(struct aat2870_bl_platform_data),
+ },
+ {
+ .name = "aat2870-regulator",
+ .id = AAT2870_ID_LDOA,
+ .pdata_size = sizeof(struct regulator_init_data),
+ },
+ {
+ .name = "aat2870-regulator",
+ .id = AAT2870_ID_LDOB,
+ .pdata_size = sizeof(struct regulator_init_data),
+ },
+ {
+ .name = "aat2870-regulator",
+ .id = AAT2870_ID_LDOC,
+ .pdata_size = sizeof(struct regulator_init_data),
+ },
+ {
+ .name = "aat2870-regulator",
+ .id = AAT2870_ID_LDOD,
+ .pdata_size = sizeof(struct regulator_init_data),
+ },
+};
+
+static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
+{
+ struct i2c_client *client = aat2870->client;
+ int ret = 0;
+
+ if (addr >= AAT2870_REG_NUM) {
+ dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
+ return -EINVAL;
+ }
+
+ mutex_lock(&aat2870->io_lock);
+
+ if (!aat2870->reg_cache[addr].readable) {
+ *val = aat2870->reg_cache[addr].value;
+ goto out_unlock;
+ }
+
+ ret = i2c_master_send(client, &addr, 1);
+ if (ret < 0)
+ goto out_unlock;
+ if (ret != 1) {
+ ret = -EIO;
+ goto out_unlock;
+ }
+
+ ret = i2c_master_recv(client, val, 1);
+ if (ret < 0)
+ goto out_unlock;
+ if (ret != 1) {
+ ret = -EIO;
+ goto out_unlock;
+ }
+
+ ret = 0;
+
+out_unlock:
+ mutex_unlock(&aat2870->io_lock);
+ dev_dbg(&client->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
+
+ return ret;
+}
+
+static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
+{
+ struct i2c_client *client = aat2870->client;
+ u8 msg[2];
+ int ret = 0;
+
+ if (addr >= AAT2870_REG_NUM) {
+ dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
+ return -EINVAL;
+ }
+
+ if (!aat2870->reg_cache[addr].writeable) {
+ dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
+ addr);
+ return -EINVAL;
+ }
+
+ mutex_lock(&aat2870->io_lock);
+
+ msg[0] = addr;
+ msg[1] = val;
+ ret = i2c_master_send(client, msg, 2);
+ if (ret < 0)
+ goto out_unlock;
+ if (ret != 2) {
+ ret = -EIO;
+ goto out_unlock;
+ }
+
+ aat2870->reg_cache[addr].value = val;
+ ret = 0;
+
+out_unlock:
+ mutex_unlock(&aat2870->io_lock);
+ dev_dbg(&client->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
+
+ return ret;
+}
+
+static int aat2870_update_bits(struct aat2870_data *aat2870, u8 addr,
+ u8 mask, u8 val)
+{
+ int change;
+ u8 old_val, new_val;
+ int ret;
+
+ ret = aat2870->read(aat2870, addr, &old_val);
+ if (ret)
+ return ret;
+
+ new_val = (old_val & ~mask) | val;
+ change = old_val != new_val;
+ if (change)
+ ret = aat2870->write(aat2870, addr, new_val);
+
+ dev_dbg(&aat2870->client->dev,
+ "update_bits: change=%d, addr=0x%02x, old=0x%02x, new=0x%02x\n",
+ change, addr, old_val, new_val);
+
+ return ret;
+}
+
+static inline void aat2870_enable(struct aat2870_data *aat2870)
+{
+ if (aat2870->en_pin >= 0)
+ gpio_set_value(aat2870->en_pin, 1);
+
+ aat2870->is_enable = 1;
+}
+
+static inline void aat2870_disable(struct aat2870_data *aat2870)
+{
+ if (aat2870->en_pin >= 0)
+ gpio_set_value(aat2870->en_pin, 0);
+
+ aat2870->is_enable = 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
+{
+ u8 addr, val;
+ ssize_t count = 0;
+ int ret;
+
+ count += sprintf(buf, "aat2870 registers\n");
+ for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
+ count += sprintf(buf + count, "0x%02x: ", addr);
+ if (count >= PAGE_SIZE - 1)
+ break;
+
+ ret = aat2870->read(aat2870, addr, &val);
+ if (ret == 0)
+ count += snprintf(buf + count, PAGE_SIZE - count,
+ "0x%02x", val);
+ else
+ count += snprintf(buf + count, PAGE_SIZE - count,
+ "<read fail: %d>", ret);
+
+ if (count >= PAGE_SIZE - 1)
+ break;
+
+ count += snprintf(buf + count, PAGE_SIZE - count, "\n");
+ if (count >= PAGE_SIZE - 1)
+ break;
+ }
+
+ /* Truncate count; min() would cause a warning */
+ if (count >= PAGE_SIZE)
+ count = PAGE_SIZE - 1;
+
+ return count;
+}
+
+static int aat2870_reg_open_file(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+
+ return 0;
+}
+
+static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct aat2870_data *aat2870 = file->private_data;
+ char *buf;
+ ssize_t ret;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = aat2870_dump_reg(aat2870, buf);
+ if (ret >= 0)
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+
+ kfree(buf);
+
+ return ret;
+}
+
+static ssize_t aat2870_reg_write_file(struct file *file,
+ const char __user *user_buf, size_t count,
+ loff_t *ppos)
+{
+ struct aat2870_data *aat2870 = file->private_data;
+ char buf[32];
+ int buf_size;
+ char *start = buf;
+ unsigned long addr, val;
+ int ret;
+
+ buf_size = min(count, (sizeof(buf)-1));
+ if (copy_from_user(buf, user_buf, buf_size)) {
+ dev_err(aat2870->dev, "Failed to copy from user\n");
+ return -EFAULT;
+ }
+ buf[buf_size] = 0;
+
+ while (*start == ' ')
+ start++;
+
+ addr = simple_strtoul(start, &start, 16);
+ if (addr >= AAT2870_REG_NUM) {
+ dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
+ return -EINVAL;
+ }
+
+ while (*start == ' ')
+ start++;
+
+ if (strict_strtoul(start, 16, &val))
+ return -EINVAL;
+
+ ret = aat2870->write(aat2870, (u8)addr, (u8)val);
+ if (ret)
+ return ret;
+
+ return buf_size;
+}
+
+static const struct file_operations aat2870_reg_fops = {
+ .open = aat2870_reg_open_file,
+ .read = aat2870_reg_read_file,
+ .write = aat2870_reg_write_file,
+};
+
+static void aat2870_init_debugfs(struct aat2870_data *aat2870)
+{
+ aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
+ if (!aat2870->dentry_root) {
+ dev_warn(aat2870->dev,
+ "Failed to create debugfs root directory\n");
+ return;
+ }
+
+ aat2870->dentry_reg = debugfs_create_file("regs", 0644,
+ aat2870->dentry_root,
+ aat2870, &aat2870_reg_fops);
+ if (!aat2870->dentry_reg)
+ dev_warn(aat2870->dev,
+ "Failed to create debugfs register file\n");
+}
+
+static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
+{
+ debugfs_remove_recursive(aat2870->dentry_root);
+}
+#else
+static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
+{
+}
+
+static inline void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
+{
+}
+#endif /* CONFIG_DEBUG_FS */
+
+static int aat2870_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct aat2870_platform_data *pdata = client->dev.platform_data;
+ struct aat2870_data *aat2870;
+ int i, j;
+ int ret = 0;
+
+ aat2870 = kzalloc(sizeof(struct aat2870_data), GFP_KERNEL);
+ if (!aat2870) {
+ dev_err(&client->dev,
+ "Failed to allocate memory for aat2870\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ aat2870->dev = &client->dev;
+ dev_set_drvdata(aat2870->dev, aat2870);
+
+ aat2870->client = client;
+ i2c_set_clientdata(client, aat2870);
+
+ aat2870->reg_cache = aat2870_regs;
+
+ if (pdata->en_pin < 0)
+ aat2870->en_pin = -1;
+ else
+ aat2870->en_pin = pdata->en_pin;
+
+ aat2870->init = pdata->init;
+ aat2870->uninit = pdata->uninit;
+ aat2870->read = aat2870_read;
+ aat2870->write = aat2870_write;
+ aat2870->update_bits = aat2870_update_bits;
+
+ mutex_init(&aat2870->io_lock);
+
+ if (aat2870->init)
+ aat2870->init(aat2870);
+
+ if (aat2870->en_pin >= 0) {
+ ret = gpio_request(aat2870->en_pin, "aat2870-en");
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Failed to request GPIO %d\n", aat2870->en_pin);
+ goto out_kfree;
+ }
+ gpio_direction_output(aat2870->en_pin, 1);
+ }
+
+ aat2870_enable(aat2870);
+
+ for (i = 0; i < pdata->num_subdevs; i++) {
+ for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
+ if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
+ !strcmp(pdata->subdevs[i].name,
+ aat2870_devs[j].name)) {
+ aat2870_devs[j].platform_data =
+ pdata->subdevs[i].platform_data;
+ break;
+ }
+ }
+ }
+
+ ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
+ ARRAY_SIZE(aat2870_devs), NULL, 0);
+ if (ret != 0) {
+ dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
+ goto out_disable;
+ }
+
+ aat2870_init_debugfs(aat2870);
+
+ return 0;
+
+out_disable:
+ aat2870_disable(aat2870);
+ if (aat2870->en_pin >= 0)
+ gpio_free(aat2870->en_pin);
+out_kfree:
+ kfree(aat2870);
+out:
+ return ret;
+}
+
+static int aat2870_i2c_remove(struct i2c_client *client)
+{
+ struct aat2870_data *aat2870 = i2c_get_clientdata(client);
+
+ aat2870_uninit_debugfs(aat2870);
+
+ mfd_remove_devices(aat2870->dev);
+ aat2870_disable(aat2870);
+ if (aat2870->en_pin >= 0)
+ gpio_free(aat2870->en_pin);
+ if (aat2870->uninit)
+ aat2870->uninit(aat2870);
+ kfree(aat2870);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int aat2870_i2c_suspend(struct i2c_client *client, pm_message_t state)
+{
+ struct aat2870_data *aat2870 = i2c_get_clientdata(client);
+
+ aat2870_disable(aat2870);
+
+ return 0;
+}
+
+static int aat2870_i2c_resume(struct i2c_client *client)
+{
+ struct aat2870_data *aat2870 = i2c_get_clientdata(client);
+ struct aat2870_register *reg = NULL;
+ int i;
+
+ aat2870_enable(aat2870);
+
+ /* restore registers */
+ for (i = 0; i < AAT2870_REG_NUM; i++) {
+ reg = &aat2870->reg_cache[i];
+ if (reg->writeable)
+ aat2870->write(aat2870, i, reg->value);
+ }
+
+ return 0;
+}
+#else
+#define aat2870_i2c_suspend NULL
+#define aat2870_i2c_resume NULL
+#endif /* CONFIG_PM */
+
+static struct i2c_device_id aat2870_i2c_id_table[] = {
+ { "aat2870", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
+
+static struct i2c_driver aat2870_i2c_driver = {
+ .driver = {
+ .name = "aat2870",
+ .owner = THIS_MODULE,
+ },
+ .probe = aat2870_i2c_probe,
+ .remove = aat2870_i2c_remove,
+ .suspend = aat2870_i2c_suspend,
+ .resume = aat2870_i2c_resume,
+ .id_table = aat2870_i2c_id_table,
+};
+
+static int __init aat2870_init(void)
+{
+ return i2c_add_driver(&aat2870_i2c_driver);
+}
+subsys_initcall(aat2870_init);
+
+static void __exit aat2870_exit(void)
+{
+ i2c_del_driver(&aat2870_i2c_driver);
+}
+module_exit(aat2870_exit);
+
+MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index d7ed20f..0f37466 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -303,5 +303,12 @@ config REGULATOR_TPS65910
help
This driver supports TPS65910 voltage regulator chips.

+config REGULATOR_AAT2870
+ bool "AnalogicTech AAT2870 Regulators"
+ depends on MFD_AAT2870_CORE
+ help
+ If you have a AnalogicTech AAT2870 say Y to enable the
+ regulator driver.
+
endif

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 3932d2e..8b8f3bc 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -43,5 +43,6 @@ obj-$(CONFIG_REGULATOR_ISL6271A) += isl6271a-regulator.o
obj-$(CONFIG_REGULATOR_AB8500) += ab8500.o
obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
+obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o

ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/aat2870-regulator.c b/drivers/regulator/aat2870-regulator.c
new file mode 100644
index 0000000..a26bcc9
--- /dev/null
+++ b/drivers/regulator/aat2870-regulator.c
@@ -0,0 +1,265 @@
+/*
+ * linux/drivers/regulator/aat2870-regulator.c
+ *
+ * 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
+ */X-NVConfidentiality: public
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/aat2870.h>
+
+struct aat2870_regulator {
+ struct platform_device *pdev;
+ struct regulator_desc desc;
+
+ const int *voltages; /* uV */
+
+ int min_uV;
+ int max_uV;
+
+ u8 enable_addr;
+ u8 enable_shift;
+ u8 enable_mask;
+
+ u8 voltage_addr;
+ u8 voltage_shift;
+ u8 voltage_mask;
+};
+
+static int aat2870_ldo_list_voltage(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+
+ return ri->voltages[selector];
+}
+
+static int aat2870_ldo_set_voltage(struct regulator_dev *rdev,
+ int min_uV, int max_uV, unsigned *selector)
+{
+ struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+ struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+ u8 val;
+ int uV;
+ int i;
+
+ if ((min_uV < ri->min_uV) || (max_uV > ri->max_uV)) {
+ dev_err(&rdev->dev,
+ "Invalid voltage, min %duV(>=%duV), max %duV(<=%duV)\n",
+ min_uV, ri->min_uV, max_uV, ri->max_uV);
+ return -EDOM;
+ }
+
+ for (i = 0; i < ri->desc.n_voltages; i++) {
+ uV = ri->voltages[i];
+ if ((min_uV <= uV) && (uV <= max_uV)) {
+ val = (i << ri->voltage_shift) & ri->voltage_mask;
+ break;
+ }
+ }
+
+ if (i >= ri->desc.n_voltages)
+ return -EINVAL;
+
+ *selector = i;
+
+ return aat2870->update_bits(aat2870, ri->voltage_addr,
+ ri->voltage_mask, val);
+}
+
+static int aat2870_ldo_get_voltage(struct regulator_dev *rdev)
+{
+ struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+ struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+ u8 val;
+ int ret;
+
+ ret = aat2870->read(aat2870, ri->voltage_addr, &val);
+ if (ret)
+ return ret;
+
+ val = (val & ri->voltage_mask) >> ri->voltage_shift;
+ if (val >= ri->desc.n_voltages)
+ return -EIO;
+
+ return ri->voltages[val];
+}
+
+static int aat2870_ldo_enable(struct regulator_dev *rdev)
+{
+ struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+ struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+
+ return aat2870->update_bits(aat2870, ri->enable_addr,
+ ri->enable_mask, ri->enable_mask);
+}
+
+static int aat2870_ldo_disable(struct regulator_dev *rdev)
+{
+ struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+ struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+
+ return aat2870->update_bits(aat2870, ri->enable_addr,
+ ri->enable_mask, 0);
+}
+
+static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
+{
+ struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
+ struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent);
+ u8 val;
+ int ret;
+
+ ret = aat2870->read(aat2870, ri->enable_addr, &val);
+ if (ret)
+ return ret;
+
+ return val & ri->enable_mask ? 1 : 0;
+}
+
+static struct regulator_ops aat2870_ldo_ops = {
+ .list_voltage = aat2870_ldo_list_voltage,
+ .set_voltage = aat2870_ldo_set_voltage,
+ .get_voltage = aat2870_ldo_get_voltage,
+ .enable = aat2870_ldo_enable,
+ .disable = aat2870_ldo_disable,
+ .is_enabled = aat2870_ldo_is_enabled,
+};
+
+static const int aat2870_ldo_voltages[] = {
+ 1200000, 1300000, 1500000, 1600000,
+ 1800000, 2000000, 2200000, 2500000,
+ 2600000, 2700000, 2800000, 2900000,
+ 3000000, 3100000, 3200000, 3300000,
+};
+
+#define AAT2870_LDO(ids) \
+ { \
+ .desc = { \
+ .name = #ids, \
+ .id = AAT2870_ID_##ids, \
+ .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
+ .ops = &aat2870_ldo_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .owner = THIS_MODULE, \
+ }, \
+ .voltages = aat2870_ldo_voltages, \
+ .min_uV = 1200000, \
+ .max_uV = 3300000, \
+ }
+
+static struct aat2870_regulator aat2870_regulators[] = {
+ AAT2870_LDO(LDOA),
+ AAT2870_LDO(LDOB),
+ AAT2870_LDO(LDOC),
+ AAT2870_LDO(LDOD),
+};
+
+static struct aat2870_regulator *aat2870_get_regulator(int id)
+{
+ struct aat2870_regulator *ri = NULL;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
+ ri = &aat2870_regulators[i];
+ if (ri->desc.id == id)
+ break;
+ }
+
+ if (!ri)
+ return NULL;
+
+ ri->enable_addr = AAT2870_LDO_EN;
+ ri->enable_shift = id - AAT2870_ID_LDOA;
+ ri->enable_mask = 0x1 << ri->enable_shift;
+
+ ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
+ AAT2870_LDO_CD : AAT2870_LDO_AB;
+ ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
+ ri->voltage_mask = 0xF << ri->voltage_shift;
+
+ return ri;
+}
+
+static int aat2870_regulator_probe(struct platform_device *pdev)
+{
+ struct regulator_init_data *init_data = pdev->dev.platform_data;
+ struct aat2870_regulator *ri;
+ struct regulator_dev *rdev;
+
+ if (!init_data) {
+ dev_err(&pdev->dev, "No regulator init data\n");
+ return -ENXIO;
+ }
+
+ ri = aat2870_get_regulator(pdev->id);
+ if (!ri) {
+ dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
+ return -EINVAL;
+ }
+ ri->pdev = pdev;
+
+ rdev = regulator_register(&ri->desc, &pdev->dev, init_data, ri);
+ if (IS_ERR(rdev)) {
+ dev_err(&pdev->dev, "Failed to register regulator %s\n",
+ ri->desc.name);
+ return PTR_ERR(rdev);
+ }
+ platform_set_drvdata(pdev, rdev);
+
+ return 0;
+}
+
+static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
+{
+ struct regulator_dev *rdev = platform_get_drvdata(pdev);
+
+ regulator_unregister(rdev);
+ return 0;
+}
+
+static struct platform_driver aat2870_regulator_driver = {
+ .driver = {
+ .name = "aat2870-regulator",
+ .owner = THIS_MODULE,
+ },
+ .probe = aat2870_regulator_probe,
+ .remove = __devexit_p(aat2870_regulator_remove),
+};
+
+static int __init aat2870_regulator_init(void)
+{
+ return platform_driver_register(&aat2870_regulator_driver);
+}
+subsys_initcall(aat2870_regulator_init);
+
+static void __exit aat2870_regulator_exit(void)
+{
+ platform_driver_unregister(&aat2870_regulator_driver);
+}
+module_exit(aat2870_regulator_exit);
+
+MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 0c9373b..3fde1ec 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -315,6 +315,13 @@ config BACKLIGHT_PCF50633
If you have a backlight driven by a NXP PCF50633 MFD, say Y here to
enable its driver.

+config BACKLIGHT_AAT2870
+ bool "AnalogicTech AAT2870 Backlight"
+ depends on ( BACKLIGHT_CLASS_DEVICE = y ) && MFD_AAT2870_CORE
+ help
+ If you have a AnalogicTech AAT2870 say Y to enable the
+ backlight driver.
+
endif # BACKLIGHT_CLASS_DEVICE

endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index b9ca849..2a08271 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -36,4 +36,5 @@ obj-$(CONFIG_BACKLIGHT_ADP5520) += adp5520_bl.o
obj-$(CONFIG_BACKLIGHT_ADP8860) += adp8860_bl.o
obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
+obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o

diff --git a/drivers/video/backlight/aat2870_bl.c b/drivers/video/backlight/aat2870_bl.c
new file mode 100644
index 0000000..4952a61
--- /dev/null
+++ b/drivers/video/backlight/aat2870_bl.c
@@ -0,0 +1,246 @@
+/*
+ * linux/drivers/video/backlight/aat2870_bl.c
+ *
+ * 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
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/mfd/aat2870.h>
+
+struct aat2870_bl_driver_data {
+ struct platform_device *pdev;
+ struct backlight_device *bd;
+
+ int channels;
+ int max_current;
+ int brightness; /* current brightness */
+};
+
+static inline int aat2870_brightness(struct aat2870_bl_driver_data *aat2870_bl,
+ int brightness)
+{
+ struct backlight_device *bd = aat2870_bl->bd;
+ int val;
+
+ val = brightness * aat2870_bl->max_current;
+ val /= bd->props.max_brightness;
+
+ return val;
+}
+
+static inline int aat2870_bl_enable(struct aat2870_bl_driver_data *aat2870_bl)
+{
+ struct aat2870_data *aat2870
+ = dev_get_drvdata(aat2870_bl->pdev->dev.parent);
+
+ return aat2870->write(aat2870, AAT2870_BL_CH_EN,
+ (u8)aat2870_bl->channels);
+}
+
+static inline int aat2870_bl_disable(struct aat2870_bl_driver_data *aat2870_bl)
+{
+ struct aat2870_data *aat2870
+ = dev_get_drvdata(aat2870_bl->pdev->dev.parent);
+
+ return aat2870->write(aat2870, AAT2870_BL_CH_EN, 0x0);
+}
+
+static int aat2870_bl_get_brightness(struct backlight_device *bd)
+{
+ return bd->props.brightness;
+}
+
+static int aat2870_bl_update_status(struct backlight_device *bd)
+{
+ struct aat2870_bl_driver_data *aat2870_bl = dev_get_drvdata(&bd->dev);
+ struct aat2870_data *aat2870 =
+ dev_get_drvdata(aat2870_bl->pdev->dev.parent);
+ int brightness = bd->props.brightness;
+ int ret;
+
+ if ((brightness < 0) || (bd->props.max_brightness < brightness)) {
+ dev_err(&bd->dev, "invalid brightness, %d\n", brightness);
+ return -EINVAL;
+ }
+
+ dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n",
+ bd->props.brightness, bd->props.power, bd->props.state);
+
+ if ((bd->props.power != FB_BLANK_UNBLANK) ||
+ (bd->props.state & BL_CORE_FBBLANK) ||
+ (bd->props.state & BL_CORE_SUSPENDED))
+ brightness = 0;
+
+ ret = aat2870->write(aat2870, AAT2870_BLM,
+ (u8)aat2870_brightness(aat2870_bl, brightness));
+ if (ret < 0)
+ return ret;
+
+ if (brightness == 0) {
+ ret = aat2870_bl_disable(aat2870_bl);
+ if (ret < 0)
+ return ret;
+ } else if (aat2870_bl->brightness == 0) {
+ ret = aat2870_bl_enable(aat2870_bl);
+ if (ret < 0)
+ return ret;
+ }
+
+ aat2870_bl->brightness = brightness;
+
+ return 0;
+}
+
+static int aat2870_bl_check_fb(struct backlight_device *bd, struct fb_info *fi)
+{
+ return 1;
+}
+
+static const struct backlight_ops aat2870_bl_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .get_brightness = aat2870_bl_get_brightness,
+ .update_status = aat2870_bl_update_status,
+ .check_fb = aat2870_bl_check_fb,
+};
+
+static int aat2870_bl_probe(struct platform_device *pdev)
+{
+ struct aat2870_bl_platform_data *pdata = pdev->dev.platform_data;
+ struct aat2870_bl_driver_data *aat2870_bl;
+ struct backlight_device *bd;
+ struct backlight_properties props;
+ int ret = 0;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platform data\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ if (pdev->id != AAT2870_ID_BL) {
+ dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ aat2870_bl = kzalloc(sizeof(struct aat2870_bl_driver_data), GFP_KERNEL);
+ if (!aat2870_bl) {
+ dev_err(&pdev->dev,
+ "Failed to allocate memory for aat2870 backlight\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+
+ props.type = BACKLIGHT_RAW;
+ bd = backlight_device_register("aat2870-backlight", &pdev->dev,
+ aat2870_bl, &aat2870_bl_ops, &props);
+ if (!bd) {
+ dev_err(&pdev->dev,
+ "Failed allocate memory for backlight device\n");
+ ret = -ENOMEM;
+ goto out_kfree;
+ }
+
+ aat2870_bl->pdev = pdev;
+ platform_set_drvdata(pdev, aat2870_bl);
+
+ aat2870_bl->bd = bd;
+
+ if (pdata->channels > 0)
+ aat2870_bl->channels = pdata->channels;
+ else
+ aat2870_bl->channels = AAT2870_BL_CH_ALL;
+
+ if (pdata->max_brightness > 0)
+ aat2870_bl->max_current = pdata->max_current;
+ else
+ aat2870_bl->max_current = AAT2870_CURRENT_27_9;
+
+ if (pdata->max_brightness > 0)
+ bd->props.max_brightness = pdata->max_brightness;
+ else
+ bd->props.max_brightness = 255;
+
+ aat2870_bl->brightness = 0;
+ bd->props.power = FB_BLANK_UNBLANK;
+ bd->props.brightness = bd->props.max_brightness;
+
+ ret = aat2870_bl_update_status(bd);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to initialize\n");
+ goto out_bl_dev_unregister;
+ }
+
+ return 0;
+
+out_bl_dev_unregister:
+ backlight_device_unregister(bd);
+out_kfree:
+ kfree(aat2870_bl);
+out:
+ return ret;
+}
+
+static int aat2870_bl_remove(struct platform_device *pdev)
+{
+ struct aat2870_bl_driver_data *aat2870_bl = platform_get_drvdata(pdev);
+ struct backlight_device *bd = aat2870_bl->bd;
+
+ bd->props.power = FB_BLANK_POWERDOWN;
+ bd->props.brightness = 0;
+ backlight_update_status(bd);
+
+ backlight_device_unregister(bd);
+ kfree(aat2870_bl);
+
+ return 0;
+}
+
+static struct platform_driver aat2870_bl_driver = {
+ .driver = {
+ .name = "aat2870-backlight",
+ .owner = THIS_MODULE,
+ },
+ .probe = aat2870_bl_probe,
+ .remove = aat2870_bl_remove,
+};
+
+static int __init aat2870_bl_init(void)
+{
+ return platform_driver_register(&aat2870_bl_driver);
+}
+subsys_initcall(aat2870_bl_init);
+
+static void __exit aat2870_bl_exit(void)
+{
+ platform_driver_unregister(&aat2870_bl_driver);
+}
+module_exit(aat2870_bl_exit);
+
+MODULE_DESCRIPTION("AnalogicTech AAT2870 Backlight");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
diff --git a/include/linux/mfd/aat2870.h b/include/linux/mfd/aat2870.h
new file mode 100644
index 0000000..d34944e
--- /dev/null
+++ b/include/linux/mfd/aat2870.h
@@ -0,0 +1,182 @@
+/*
+ * 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_bits)(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 */
--
1.7.1