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>

3 files changed, 546 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index c26136443c05..21574bdf485f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -760,6 +760,16 @@ config MFD_PM8XXX_IRQ
 config TPS65911_COMPARATOR
         tristate
 
+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 ca1867db3db8..c58020303d18 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -101,3 +101,4 @@ 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_TPS65911_COMPARATOR)       += tps65911-comparator.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 000000000000..345dc658ef06
--- /dev/null
+++ b/drivers/mfd/aat2870-core.c
@@ -0,0 +1,535 @@
+/*
+ * 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)
+{
+        int ret;
+
+        if (addr >= AAT2870_REG_NUM) {
+                dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
+                return -EINVAL;
+        }
+
+        if (!aat2870->reg_cache[addr].readable) {
+                *val = aat2870->reg_cache[addr].value;
+                goto out;
+        }
+
+        ret = i2c_master_send(aat2870->client, &addr, 1);
+        if (ret < 0)
+                return ret;
+        if (ret != 1)
+                return -EIO;
+
+        ret = i2c_master_recv(aat2870->client, val, 1);
+        if (ret < 0)
+                return ret;
+        if (ret != 1)
+                return -EIO;
+
+out:
+        dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
+        return 0;
+}
+
+static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
+{
+        u8 msg[2];
+        int ret;
+
+        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;
+        }
+
+        msg[0] = addr;
+        msg[1] = val;
+        ret = i2c_master_send(aat2870->client, msg, 2);
+        if (ret < 0)
+                return ret;
+        if (ret != 2)
+                return -EIO;
+
+        aat2870->reg_cache[addr].value = val;
+
+        dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
+        return 0;
+}
+
+static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
+{
+        int ret;
+
+        mutex_lock(&aat2870->io_lock);
+        ret = __aat2870_read(aat2870, addr, val);
+        mutex_unlock(&aat2870->io_lock);
+
+        return ret;
+}
+
+static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
+{
+        int ret;
+
+        mutex_lock(&aat2870->io_lock);
+        ret = __aat2870_write(aat2870, addr, val);
+        mutex_unlock(&aat2870->io_lock);
+
+        return ret;
+}
+
+static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
+                          u8 val)
+{
+        int change;
+        u8 old_val, new_val;
+        int ret;
+
+        mutex_lock(&aat2870->io_lock);
+
+        ret = __aat2870_read(aat2870, addr, &old_val);
+        if (ret)
+                goto out_unlock;
+
+        new_val = (old_val & ~mask) | (val & mask);
+        change = old_val != new_val;
+        if (change)
+                ret = __aat2870_write(aat2870, addr, new_val);
+
+out_unlock:
+        mutex_unlock(&aat2870->io_lock);
+
+        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 = aat2870_update;
+
+        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>");