mfd: Add support for Skyworks SKY81452 driver

Signed-off-by: Gyungoh Yoo <jack.yoo@skyworksinc.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

4 files changed, 152 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b277f37ae3be..5e68fdef64e7 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -791,6 +791,18 @@ config MFD_SM501_GPIO
          lines on the SM501. The platform data is used to supply the
          base number for the first GPIO line to register.
 
+config MFD_SKY81452
+        tristate "Skyworks Solutions SKY81452"
+        select MFD_CORE
+        select REGMAP_I2C
+        depends on I2C
+        help
+          This is the core driver for the Skyworks SKY81452 backlight and
+          voltage regulator device.
+
+          This driver can also be built as a module.  If so, the module
+          will be called sky81452.
+
 config MFD_SMSC
        bool "SMSC ECE1099 series chips"
        depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 5ebe443b595a..0e5cfeba107c 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -180,6 +180,7 @@ obj-$(CONFIG_MFD_MENF21BMC)	+= menf21bmc.o
 obj-$(CONFIG_MFD_HI6421_PMIC)   += hi6421-pmic-core.o
 obj-$(CONFIG_MFD_DLN2)          += dln2.o
 obj-$(CONFIG_MFD_RT5033)        += rt5033.o
+obj-$(CONFIG_MFD_SKY81452)      += sky81452.o
 
 intel-soc-pmic-objs             := intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)    += intel-soc-pmic.o
diff --git a/drivers/mfd/sky81452.c b/drivers/mfd/sky81452.c
new file mode 100644
index 000000000000..b0c9b0415650
--- /dev/null
+++ b/drivers/mfd/sky81452.c
@@ -0,0 +1,108 @@
+/*
+ * sky81452.c   SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sky81452.h>
+
+static const struct regmap_config sky81452_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+};
+
+static int sky81452_probe(struct i2c_client *client,
+                                const struct i2c_device_id *id)
+{
+        struct device *dev = &client->dev;
+        const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
+        struct mfd_cell cells[2];
+        struct regmap *regmap;
+        int ret;
+
+        if (!pdata) {
+                pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+                if (!pdata)
+                        return -ENOMEM;
+        }
+
+        regmap = devm_regmap_init_i2c(client, &sky81452_config);
+        if (IS_ERR(regmap)) {
+                dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
+                return PTR_ERR(regmap);
+        }
+
+        i2c_set_clientdata(client, regmap);
+
+        memset(cells, 0, sizeof(cells));
+        cells[0].name = "sky81452-backlight";
+        cells[0].of_compatible = "skyworks,sky81452-backlight";
+        cells[0].platform_data = pdata->bl_pdata;
+        cells[0].pdata_size = sizeof(*pdata->bl_pdata);
+        cells[1].name = "sky81452-regulator";
+        cells[1].platform_data = pdata->regulator_init_data;
+        cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
+
+        ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
+        if (ret)
+                dev_err(dev, "failed to add child devices. err=%d\n", ret);
+
+        return ret;
+}
+
+static int sky81452_remove(struct i2c_client *client)
+{
+        mfd_remove_devices(&client->dev);
+        return 0;
+}
+
+static const struct i2c_device_id sky81452_ids[] = {
+        { "sky81452" },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, sky81452_ids);
+
+#ifdef CONFIG_OF
+static const struct of_device_id sky81452_of_match[] = {
+        { .compatible = "skyworks,sky81452", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, sky81452_of_match);
+#endif
+
+static struct i2c_driver sky81452_driver = {
+        .driver = {
+                .name = "sky81452",
+                .of_match_table = of_match_ptr(sky81452_of_match),
+        },
+        .probe = sky81452_probe,
+        .remove = sky81452_remove,
+        .id_table = sky81452_ids,
+};
+
+module_i2c_driver(sky81452_driver);
+
+MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
+MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/sky81452.h b/include/linux/mfd/sky81452.h
new file mode 100644
index 000000000000..b0925fa3e9ef
--- /dev/null
+++ b/include/linux/mfd/sky81452.h
@@ -0,0 +1,31 @@
+/*
+ * sky81452.h   SKY81452 MFD driver
+ *
+ * Copyright 2014 Skyworks Solutions Inc.
+ * Author : Gyungoh Yoo <jack.yoo@skyworksinc.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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SKY81452_H
+#define _SKY81452_H
+
+#include <linux/platform_data/sky81452-backlight.h>
+#include <linux/regulator/machine.h>
+
+struct sky81452_platform_data {
+        struct sky81452_bl_platform_data *bl_pdata;
+        struct regulator_init_data *regulator_init_data;
+};
+
+#endif