mfd: smsc: Add support for smsc gpio io/keypad driver

smsc ece1099 is a keyboard scan or gpio expansion device.
The patch create keypad and gpio expander child for this
multi function smsc driver.

Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 126 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6bfa2a1ec9df..ae511b738441 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -375,6 +375,18 @@ config MFD_T7L66XB
         help
           Support for Toshiba Mobile IO Controller T7L66XB
 
+config MFD_SMSC
+       bool "Support for the SMSC ECE1099 series chips"
+       depends on I2C=y
+       select MFD_CORE
+       select REGMAP_I2C
+       help
+        If you say yes here you get support for the
+        ece1099 chips from SMSC.
+
+        To compile this driver as a module, choose M here: the
+        module will be called smsc.
+
 config MFD_TC6387XB
         bool "Support Toshiba TC6387XB"
         depends on ARM && HAVE_CLK
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 33c0e49f7e60..d8ccb630ddb0 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -76,6 +76,7 @@ obj-$(CONFIG_EZX_PCAP)		+= ezx-pcap.o
 obj-$(CONFIG_MCP)               += mcp-core.o
 obj-$(CONFIG_MCP_SA11X0)        += mcp-sa11x0.o
 obj-$(CONFIG_MCP_UCB1200)       += ucb1x00-core.o
+obj-$(CONFIG_MFD_SMSC)        += smsc-ece1099.o
 obj-$(CONFIG_MCP_UCB1200_TS)    += ucb1x00-ts.o
 
 ifeq ($(CONFIG_SA1100_ASSABET),y)
diff --git a/drivers/mfd/smsc-ece1099.c b/drivers/mfd/smsc-ece1099.c
new file mode 100644
index 000000000000..24ae3d8421c5
--- /dev/null
+++ b/drivers/mfd/smsc-ece1099.c
@@ -0,0 +1,113 @@
+/*
+ * TI SMSC MFD Driver
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Sourav Poddar <sourav.poddar@ti.com>
+ *
+ *  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;  GPL v2.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+#include <linux/irq.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/smsc.h>
+#include <linux/of_platform.h>
+
+static struct regmap_config smsc_regmap_config = {
+                .reg_bits = 8,
+                .val_bits = 8,
+                .max_register = SMSC_VEN_ID_H,
+                .cache_type = REGCACHE_RBTREE,
+};
+
+static int smsc_i2c_probe(struct i2c_client *i2c,
+                        const struct i2c_device_id *id)
+{
+        struct smsc *smsc;
+        int devid, rev, venid_l, venid_h;
+        int ret = 0;
+
+        smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
+                                GFP_KERNEL);
+        if (!smsc) {
+                dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
+                return -ENOMEM;
+        }
+
+        smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
+        if (IS_ERR(smsc->regmap)) {
+                ret = PTR_ERR(smsc->regmap);
+                goto err;
+        }
+
+        i2c_set_clientdata(i2c, smsc);
+        smsc->dev = &i2c->dev;
+
+#ifdef CONFIG_OF
+        of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
+#endif
+
+        regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
+        regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
+        regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
+        regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
+
+        dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
+                devid, rev, (venid_h << 8) | venid_l);
+
+        ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
+        if (ret)
+                goto err;
+
+#ifdef CONFIG_OF
+        if (i2c->dev.of_node)
+                ret = of_platform_populate(i2c->dev.of_node,
+                                           NULL, NULL, &i2c->dev);
+#endif
+
+err:
+        return ret;
+}
+
+static int smsc_i2c_remove(struct i2c_client *i2c)
+{
+        struct smsc *smsc = i2c_get_clientdata(i2c);
+
+        mfd_remove_devices(smsc->dev);
+
+        return 0;
+}
+
+static const struct i2c_device_id smsc_i2c_id[] = {
+        { "smscece1099", 0},
+        {},
+};
+MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
+
+static struct i2c_driver smsc_i2c_driver = {
+        .driver = {
+                   .name = "smsc",
+                   .owner = THIS_MODULE,
+        },
+        .probe = smsc_i2c_probe,
+        .remove = smsc_i2c_remove,
+        .id_table = smsc_i2c_id,
+};
+
+module_i2c_driver(smsc_i2c_driver);
+
+MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
+MODULE_DESCRIPTION("SMSC chip multi-function driver");
+MODULE_LICENSE("GPL v2");