mfd: Add viperboard driver

Add mfd driver for Nano River Technologies viperboard.

Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

4 files changed, 249 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 34242cada125..b280639a7634 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1065,6 +1065,20 @@ config MFD_PALMAS
           If you say yes here you get support for the Palmas
           series of PMIC chips from Texas Instruments.
 
+config MFD_VIPERBOARD
+        tristate "Support for Nano River Technologies Viperboard"
+        select MFD_CORE
+        depends on USB
+        default n
+        help
+          Say yes here if you want support for Nano River Technologies
+          Viperboard.
+          There are mfd cell drivers available for i2c master, adc and
+          both gpios found on the board. The spi part does not yet
+          have a driver.
+          You need to select the mfd cell drivers separately.
+          The drivers do not support all features the board exposes.
+
 endmenu
 endif
 
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 632cce09e407..1c3ee7c76906 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -139,6 +139,7 @@ obj-$(CONFIG_MFD_TPS65090)	+= tps65090.o
 obj-$(CONFIG_MFD_AAT2870_CORE)  += aat2870-core.o
 obj-$(CONFIG_MFD_INTEL_MSIC)    += intel_msic.o
 obj-$(CONFIG_MFD_PALMAS)        += palmas.o
+obj-$(CONFIG_MFD_VIPERBOARD)    += viperboard.o
 obj-$(CONFIG_MFD_RC5T583)       += rc5t583.o rc5t583-irq.o
 obj-$(CONFIG_MFD_SEC_CORE)      += sec-core.o sec-irq.o
 obj-$(CONFIG_MFD_SYSCON)        += syscon.o
diff --git a/drivers/mfd/viperboard.c b/drivers/mfd/viperboard.c
new file mode 100644
index 000000000000..cd1e2fe95647
--- /dev/null
+++ b/drivers/mfd/viperboard.c
@@ -0,0 +1,129 @@
+/*
+ *  Nano River Technologies viperboard driver
+ *
+ *  This is the core driver for the viperboard. There are cell drivers
+ *  available for I2C, ADC and both GPIOs. SPI is not yet supported.
+ *  The drivers do not support all features the board exposes. See user
+ *  manual of the viperboard.
+ *
+ *  (C) 2012 by Lemonage GmbH
+ *  Author: Lars Poeschel <poeschel@lemonage.de>
+ *  All rights reserved.
+ *
+ *  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;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/viperboard.h>
+
+#include <linux/usb.h>
+
+
+static const struct usb_device_id vprbrd_table[] = {
+        { USB_DEVICE(0x2058, 0x1005) },   /* Nano River Technologies */
+        { }                               /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, vprbrd_table);
+
+static struct mfd_cell vprbrd_devs[] = {
+};
+
+static int vprbrd_probe(struct usb_interface *interface,
+                              const struct usb_device_id *id)
+{
+        struct vprbrd *vb;
+
+        u16 version = 0;
+        int pipe, ret;
+        unsigned char buf[1];
+
+        /* allocate memory for our device state and initialize it */
+        vb = kzalloc(sizeof(*vb), GFP_KERNEL);
+        if (vb == NULL) {
+                dev_err(&interface->dev, "Out of memory\n");
+                return -ENOMEM;
+        }
+
+        mutex_init(&vb->lock);
+
+        vb->usb_dev = usb_get_dev(interface_to_usbdev(interface));
+
+        /* save our data pointer in this interface device */
+        usb_set_intfdata(interface, vb);
+        dev_set_drvdata(&vb->pdev.dev, vb);
+
+        /* get version information, major first, minor then */
+        pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
+        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR,
+                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, buf, 1,
+                VPRBRD_USB_TIMEOUT_MS);
+        if (ret == 1)
+                version = buf[0];
+
+        ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR,
+                VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, buf, 1,
+                VPRBRD_USB_TIMEOUT_MS);
+        if (ret == 1) {
+                version <<= 8;
+                version = version | buf[0];
+        }
+
+        dev_info(&interface->dev,
+                 "version %x.%02x found at bus %03d address %03d\n",
+                 version >> 8, version & 0xff,
+                 vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
+
+        ret = mfd_add_devices(&interface->dev, -1, vprbrd_devs,
+                                ARRAY_SIZE(vprbrd_devs), NULL, 0, NULL);
+        if (ret != 0) {
+                dev_err(&interface->dev, "Failed to add mfd devices to core.");
+                goto error;
+        }
+
+        return 0;
+
+error:
+        if (vb) {
+                usb_put_dev(vb->usb_dev);
+                kfree(vb);
+        }
+
+        return ret;
+}
+
+static void vprbrd_disconnect(struct usb_interface *interface)
+{
+        struct vprbrd *vb = usb_get_intfdata(interface);
+
+        mfd_remove_devices(&interface->dev);
+        usb_set_intfdata(interface, NULL);
+        usb_put_dev(vb->usb_dev);
+        kfree(vb);
+
+        dev_dbg(&interface->dev, "disconnected\n");
+}
+
+static struct usb_driver vprbrd_driver = {
+        .name           = "viperboard",
+        .probe          = vprbrd_probe,
+        .disconnect     = vprbrd_disconnect,
+        .id_table       = vprbrd_table,
+};
+
+module_usb_driver(vprbrd_driver);
+
+MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
+MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/viperboard.h b/include/linux/mfd/viperboard.h
new file mode 100644
index 000000000000..0d1342466db5
--- /dev/null
+++ b/include/linux/mfd/viperboard.h
@@ -0,0 +1,105 @@
+/*
+ *  include/linux/mfd/viperboard.h
+ *
+ *  Nano River Technologies viperboard definitions
+ *
+ *  (C) 2012 by Lemonage GmbH
+ *  Author: Lars Poeschel <poeschel@lemonage.de>
+ *  All rights reserved.
+ *
+ *  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;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#ifndef __MFD_VIPERBOARD_H__
+#define __MFD_VIPERBOARD_H__
+
+#include <linux/types.h>
+#include <linux/usb.h>
+
+#define VPRBRD_EP_OUT               0x02
+#define VPRBRD_EP_IN                0x86
+
+#define VPRBRD_I2C_MSG_LEN          512 /* max length of a msg on USB level */
+
+#define VPRBRD_I2C_FREQ_6MHZ        1                        /*   6 MBit/s */
+#define VPRBRD_I2C_FREQ_3MHZ        2                        /*   3 MBit/s */
+#define VPRBRD_I2C_FREQ_1MHZ        3                        /*   1 MBit/s */
+#define VPRBRD_I2C_FREQ_FAST        4                        /* 400 kbit/s */
+#define VPRBRD_I2C_FREQ_400KHZ      VPRBRD_I2C_FREQ_FAST
+#define VPRBRD_I2C_FREQ_200KHZ      5                        /* 200 kbit/s */
+#define VPRBRD_I2C_FREQ_STD         6                        /* 100 kbit/s */
+#define VPRBRD_I2C_FREQ_100KHZ      VPRBRD_I2C_FREQ_STD
+#define VPRBRD_I2C_FREQ_10KHZ       7                        /*  10 kbit/s */
+
+#define VPRBRD_I2C_CMD_WRITE        0x00
+#define VPRBRD_I2C_CMD_READ         0x01
+#define VPRBRD_I2C_CMD_ADDR         0x02
+
+#define VPRBRD_USB_TYPE_OUT         0x40
+#define VPRBRD_USB_TYPE_IN          0xc0
+#define VPRBRD_USB_TIMEOUT_MS       100
+#define VPRBRD_USB_REQUEST_MAJOR    0xea
+#define VPRBRD_USB_REQUEST_MINOR    0xeb
+
+struct vprbrd_i2c_write_hdr {
+        u8 cmd;
+        u16 addr;
+        u8 len1;
+        u8 len2;
+        u8 last;
+        u8 chan;
+        u16 spi;
+} __packed;
+
+struct vprbrd_i2c_read_hdr {
+        u8 cmd;
+        u16 addr;
+        u8 len0;
+        u8 len1;
+        u8 len2;
+        u8 len3;
+        u8 len4;
+        u8 len5;
+        u16 tf1;                        /* transfer 1 length */
+        u16 tf2;                        /* transfer 2 length */
+} __packed;
+
+struct vprbrd_i2c_status {
+        u8 unknown[11];
+        u8 status;
+} __packed;
+
+struct vprbrd_i2c_write_msg {
+        struct vprbrd_i2c_write_hdr header;
+        u8 data[VPRBRD_I2C_MSG_LEN
+                - sizeof(struct vprbrd_i2c_write_hdr)];
+} __packed;
+
+struct vprbrd_i2c_read_msg {
+        struct vprbrd_i2c_read_hdr header;
+        u8 data[VPRBRD_I2C_MSG_LEN
+                - sizeof(struct vprbrd_i2c_read_hdr)];
+} __packed;
+
+struct vprbrd_i2c_addr_msg {
+        u8 cmd;
+        u8 addr;
+        u8 unknown1;
+        u16 len;
+        u8 unknown2;
+        u8 unknown3;
+} __packed;
+
+/* Structure to hold all device specific stuff */
+struct vprbrd {
+        struct usb_device *usb_dev; /* the usb device for this device */
+        struct mutex lock;
+        u8 buf[sizeof(struct vprbrd_i2c_write_msg)];
+        struct platform_device pdev;
+};
+
+#endif /* __MFD_VIPERBOARD_H__ */