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Message-Id: <1346072918-3982-1-git-send-email-larsi@wh2.tu-dresden.de>
Date: Mon, 27 Aug 2012 15:08:38 +0200
From: larsi@....tu-dresden.de
To: sameo@...ux.intel.com
Cc: linux-kernel@...r.kernel.org, Lars Poeschel <poeschel@...onage.de>
Subject: [PATCH] mfd: viperboard driver added
From: Lars Poeschel <poeschel@...onage.de>
First version of the driver for Nano River Tech's
viperboard added.
It supports i2c, adc, gpio a and gpio b. spi and pwm on
the first gpio a pins is not supported yet.
Signed-off-by: Lars Poeschel <poeschel@...onage.de>
---
drivers/mfd/Kconfig | 17 +
drivers/mfd/Makefile | 1 +
drivers/mfd/viperboard.c | 1084 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1102 insertions(+)
create mode 100644 drivers/mfd/viperboard.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d1facef..da0a1ed 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1002,6 +1002,23 @@ 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"
+ depends on GPIOLIB && IIO && I2C && USB
+ default n
+ help
+ Say yes here if you want support for Nano River Technologies
+ Viperboard.
+ This driver provides support for i2c, adc and
+ both gpios found on the board. The spi part is
+ currently not supported. pwm on the first gpio a
+ pins is also not supported.
+ The driver does not support all features the
+ board exposes.
+ See viperboard API specification and Nano
+ River Tech's viperboard.h for detailed meaning
+ of the module parameters.
+
endmenu
endif
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 79dd22d..6ab6b64 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -128,6 +128,7 @@ 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_ANATOP) += anatop-mfd.o
diff --git a/drivers/mfd/viperboard.c b/drivers/mfd/viperboard.c
new file mode 100644
index 0000000..7fa688e
--- /dev/null
+++ b/drivers/mfd/viperboard.c
@@ -0,0 +1,1084 @@
+/* Nano River Technologies viperboard driver
+ *
+ * The driver does support I2C, ADC and both GPIOs. SPI is not yet supported
+ * PWM on the first GPIO A pins is also not supported.
+ * See viperboard API specification and Nano River Tech's viperboard.h for
+ * the detailed meaning of the module parameters.
+ *
+ * (C) 2012 by Lemonage GmbH
+ * Author: Lars Poeschel <poeschel@...onage.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 interfaces to usb layer */
+#include <linux/usb.h>
+
+/* include interface to i2c layer */
+#include <linux/i2c.h>
+
+/* include interface to gpio layer */
+#include <linux/gpio.h>
+
+/* include interface to iio layer */
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/* max length of a msg on USB level */
+#define VIPERBOARD_I2C_MSG_LEN 512
+
+#define VIPERBOARD_EP_OUT 0x02
+#define VIPERBOARD_EP_IN 0x86
+
+#define VIPERBOARD_I2C_FREQ_6MHZ 1 /* 6 MBit/s */
+#define VIPERBOARD_I2C_FREQ_3MHZ 2 /* 3 MBit/s */
+#define VIPERBOARD_I2C_FREQ_1MHZ 3 /* 1 MBit/s */
+#define VIPERBOARD_I2C_FREQ_FAST 4 /* 400 kbit/s */
+#define VIPERBOARD_I2C_FREQ_400KHZ VIPERBOARD_I2C_FREQ_FAST
+#define VIPERBOARD_I2C_FREQ_200KHZ 5 /* 200 kbit/s */
+#define VIPERBOARD_I2C_FREQ_STD 6 /* 100 kbit/s */
+#define VIPERBOARD_I2C_FREQ_100KHZ VIPERBOARD_I2C_FREQ_STD
+#define VIPERBOARD_I2C_FREQ_10KHZ 7 /* 10 kbit/s */
+
+#define VIPERBOARD_I2C_CMD_WRITE 0x00
+#define VIPERBOARD_I2C_CMD_READ 0x01
+#define VIPERBOARD_I2C_CMD_ADDR 0x02
+
+#define VPRBRD_GPIOA_CLK_1 0 /* (1us = 1MHz) */
+#define VPRBRD_GPIOA_CLK_10 1 /* (10us = 100kHz) */
+#define VPRBRD_GPIOA_CLK_100 2 /* (100us = 10kHz) */
+#define VPRBRD_GPIOA_CLK_1000 3 /* (1ms = 1kHz) */
+#define VPRBRD_GPIOA_CLK_10000 4 /* (10ms = 100Hz) */
+#define VPRBRD_GPIOA_CLK_100000 5 /* (100ms = 10Hz) */
+
+#define VPRBRD_GPIOA_CMD_CONT 0x00
+#define VPRBRD_GPIOA_CMD_PULSE 0x01
+#define VPRBRD_GPIOA_CMD_PWM 0x02
+#define VPRBRD_GPIOA_CMD_SETOUT 0x03
+#define VPRBRD_GPIOA_CMD_SETIN 0x04
+#define VPRBRD_GPIOA_CMD_SETINT 0x05
+#define VPRBRD_GPIOA_CMD_GETIN 0x06
+
+#define VPRBRD_GPIOB_CMD_SETDIR 0x00
+#define VPRBRD_GPIOB_CMD_SETVAL 0x01
+
+#define VPRBRD_ADC_CMD_GET 0x00
+
+struct __packed vprbrd_i2c_write_hdr {
+ u8 cmd;
+ u16 addr;
+ u8 len1;
+ u8 len2;
+ u8 last;
+ u8 chan;
+ u16 spi;
+};
+
+struct __packed 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 */
+};
+
+struct __packed vprbrd_i2c_status {
+ u8 unknown[11];
+ u8 status;
+};
+
+struct __packed vprbrd_i2c_write_msg {
+ struct vprbrd_i2c_write_hdr header;
+ u8 data[VIPERBOARD_I2C_MSG_LEN - sizeof(struct vprbrd_i2c_write_hdr)];
+};
+
+struct __packed vprbrd_i2c_read_msg {
+ struct vprbrd_i2c_read_hdr header;
+ u8 data[VIPERBOARD_I2C_MSG_LEN - sizeof(struct vprbrd_i2c_read_hdr)];
+};
+
+struct __packed vprbrd_i2c_addr_msg {
+ u8 cmd;
+ u8 addr;
+ u8 unknown1;
+ u16 len;
+ u8 unknown2;
+ u8 unknown3;
+};
+
+struct __packed vprbrd_gpioa_msg {
+ u8 cmd;
+ u8 clk;
+ u8 offset;
+ u8 t1;
+ u8 t2;
+ u8 invert;
+ u8 pwmlevel;
+ u8 outval;
+ u8 risefall;
+ u8 answer;
+ u8 __fill;
+};
+
+struct __packed vprbrd_gpiob_msg {
+ u8 cmd;
+ u16 val;
+ u16 mask;
+};
+
+struct __packed vprbrd_adc_msg {
+ u8 cmd;
+ u8 chan;
+ u8 val;
+};
+
+/* Structure to hold all of our device specific stuff */
+struct vprbrd {
+ struct usb_device *usb_dev; /* the usb device for this device */
+ struct i2c_adapter i2c; /* i2c related things */
+ struct gpio_chip gpioa; /* gpio a related things */
+ u32 gpioa_out;
+ u32 gpioa_val;
+ struct gpio_chip gpiob; /* gpio b related things */
+ u32 gpiob_out;
+ u32 gpiob_val;
+ struct iio_dev *iio; /* iio related things */
+ struct mutex lock;
+ u8 buf[sizeof(struct vprbrd_i2c_write_msg)];
+};
+
+/* i2c bus frequency module parameter */
+static unsigned char i2c_bus_freq = 6;
+module_param(i2c_bus_freq, byte, 0);
+MODULE_PARM_DESC(i2c_bus_freq, "i2c bus frequency (default is 6 for 100kHz)");
+/* gpioa sampling clock module parameter */
+static unsigned char gpioa_clk = 3;
+module_param(gpioa_clk, byte, 0);
+MODULE_PARM_DESC(gpioa_clk, "gpio a sampling clk (default is 3 for 1 kHz)");
+
+/* ----- begin of iio layer ---------------------------------------------- */
+
+struct vprbrd_adc_info {
+ struct vprbrd *vb;
+};
+
+#define VPRBRD_ADC_CHANNEL(_index) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .channel = _index, \
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, \
+ .scan_index = _index, \
+ .scan_type.sign = 'u', \
+ .scan_type.realbits = 8, \
+ .scan_type.storagebits = 8, \
+}
+
+static struct iio_chan_spec vprbrd_adc_iio_channels[] = {
+ VPRBRD_ADC_CHANNEL(0),
+ VPRBRD_ADC_CHANNEL(1),
+ VPRBRD_ADC_CHANNEL(2),
+ VPRBRD_ADC_CHANNEL(3),
+};
+
+static int vprbrd_iio_read_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long mask)
+{
+ int ret, error = 0;
+ struct vprbrd_adc_info *adc = iio_priv(iio_dev);
+ struct vprbrd *vb = adc->vb;
+ struct vprbrd_adc_msg *admsg = (struct vprbrd_adc_msg *)vb->buf;
+
+ if (mask == IIO_CHAN_INFO_RAW) {
+
+ mutex_lock(&vb->lock);
+
+ admsg->cmd = VPRBRD_ADC_CMD_GET;
+ admsg->chan = chan->scan_index;
+ admsg->val = 0x00;
+
+ ret = usb_control_msg(vb->usb_dev,
+ usb_sndctrlpipe(vb->usb_dev, 0), 0xec, 0x40,
+ 0x0000, 0x0000, admsg,
+ sizeof(struct vprbrd_adc_msg), 100);
+ if (ret != sizeof(struct vprbrd_adc_msg)) {
+ dev_err(&iio_dev->dev, "usb send error on adc read\n");
+ error = -EREMOTEIO;
+ }
+
+ ret = usb_control_msg(vb->usb_dev,
+ usb_rcvctrlpipe(vb->usb_dev, 0), 0xec, 0xc0,
+ 0x0000, 0x0000, admsg,
+ sizeof(struct vprbrd_adc_msg), 100);
+
+ *val = admsg->val;
+
+ mutex_unlock(&vb->lock);
+
+ if (ret != sizeof(struct vprbrd_adc_msg)) {
+ dev_err(&iio_dev->dev, "usb recv error on adc read\n");
+ error = -EREMOTEIO;
+ }
+
+ if (error)
+ goto error;
+
+ return IIO_VAL_INT;
+ }
+ error = -EINVAL;
+error:
+ return error;
+}
+
+static const struct iio_info vprbrd_adc_iio_info = {
+ .read_raw = &vprbrd_iio_read_raw,
+ .driver_module = THIS_MODULE,
+};
+
+/* ----- end of iio layer ------------------------------------------------ */
+
+/* ----- begin of gipo a layer ------------------------------------------- */
+
+static int vprbrd_gpioa_get(struct gpio_chip *chip,
+ unsigned offset)
+{
+ int ret, answer, error = 0;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpioa);
+ struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
+
+ /* if io is set to output, just return the saved value */
+ if (vb->gpioa_out & (1 << offset))
+ return vb->gpioa_val & (1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ gamsg->cmd = VPRBRD_GPIOA_CMD_GETIN;
+ gamsg->clk = 0x00;
+ gamsg->offset = offset;
+ gamsg->t1 = 0x00;
+ gamsg->t2 = 0x00;
+ gamsg->invert = 0x00;
+ gamsg->pwmlevel = 0x00;
+ gamsg->outval = 0x00;
+ gamsg->risefall = 0x00;
+ gamsg->answer = 0x00;
+ gamsg->__fill = 0x00;
+
+ ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
+ 0xed, 0x40, 0x0000, 0x0000, gamsg,
+ sizeof(struct vprbrd_gpioa_msg), 100);
+ if (ret != sizeof(struct vprbrd_gpioa_msg))
+ error = -EREMOTEIO;
+
+ ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
+ 0xed, 0xc0, 0x0000, 0x0000, gamsg,
+ sizeof(struct vprbrd_gpioa_msg), 100);
+ answer = gamsg->answer & 0x01;
+
+ mutex_unlock(&vb->lock);
+
+ if (ret != sizeof(struct vprbrd_gpioa_msg))
+ error = -EREMOTEIO;
+
+ if (error)
+ return error;
+
+ return answer;
+}
+
+static void vprbrd_gpioa_set(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int ret;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpioa);
+ struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
+
+ if (vb->gpioa_out & (1 << offset)) {
+ if (value)
+ vb->gpioa_val |= (1 << offset);
+ else
+ vb->gpioa_val &= ~(1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ gamsg->cmd = VPRBRD_GPIOA_CMD_SETOUT;
+ gamsg->clk = 0x00;
+ gamsg->offset = offset;
+ gamsg->t1 = 0x00;
+ gamsg->t2 = 0x00;
+ gamsg->invert = 0x00;
+ gamsg->pwmlevel = 0x00;
+ gamsg->outval = value;
+ gamsg->risefall = 0x00;
+ gamsg->answer = 0x00;
+ gamsg->__fill = 0x00;
+
+ ret = usb_control_msg(vb->usb_dev,
+ usb_sndctrlpipe(vb->usb_dev, 0), 0xed, 0x40, 0x0000,
+ 0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg), 100);
+
+ mutex_unlock(&vb->lock);
+
+ if (ret != sizeof(struct vprbrd_gpioa_msg))
+ dev_err(chip->dev, "usb error setting pin value\n");
+ }
+}
+
+static int vprbrd_gpioa_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ int ret;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpioa);
+ struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
+
+ vb->gpioa_out &= ~(1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ gamsg->cmd = VPRBRD_GPIOA_CMD_SETIN;
+ gamsg->clk = gpioa_clk;
+ gamsg->offset = offset;
+ gamsg->t1 = 0x00;
+ gamsg->t2 = 0x00;
+ gamsg->invert = 0x00;
+ gamsg->pwmlevel = 0x00;
+ gamsg->outval = 0x00;
+ gamsg->risefall = 0x00;
+ gamsg->answer = 0x00;
+ gamsg->__fill = 0x00;
+
+ ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
+ 0xed, 0x40, 0x0000, 0x0000, gamsg,
+ sizeof(struct vprbrd_gpioa_msg), 100);
+
+ mutex_unlock(&vb->lock);
+
+ if (ret != sizeof(struct vprbrd_gpioa_msg))
+ return -EREMOTEIO;
+
+ return 0;
+}
+
+static int vprbrd_gpioa_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int ret;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpioa);
+ struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
+
+ vb->gpioa_out |= (1 << offset);
+ if (value)
+ vb->gpioa_val |= (1 << offset);
+ else
+ vb->gpioa_val &= ~(1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ gamsg->cmd = VPRBRD_GPIOA_CMD_SETOUT;
+ gamsg->clk = 0x00;
+ gamsg->offset = offset;
+ gamsg->t1 = 0x00;
+ gamsg->t2 = 0x00;
+ gamsg->invert = 0x00;
+ gamsg->pwmlevel = 0x00;
+ gamsg->outval = value;
+ gamsg->risefall = 0x00;
+ gamsg->answer = 0x00;
+ gamsg->__fill = 0x00;
+
+ ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
+ 0xed, 0x40, 0x0000, 0x0000, gamsg,
+ sizeof(struct vprbrd_gpioa_msg), 100);
+
+ mutex_unlock(&vb->lock);
+
+ if (ret != sizeof(struct vprbrd_gpioa_msg))
+ return -EREMOTEIO;
+
+ return 0;
+}
+
+/* ----- end of gpio a layer --------------------------------------------- */
+
+/* ----- begin of gipo b layer ------------------------------------------- */
+
+static int vprbrd_gpiob_setdir(struct vprbrd *vb, unsigned offset,
+ unsigned dir)
+{
+ struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
+ int ret;
+
+ gbmsg->cmd = VPRBRD_GPIOB_CMD_SETDIR;
+ gbmsg->val = cpu_to_be16(dir << offset);
+ gbmsg->mask = cpu_to_be16(0x0001 << offset);
+
+ ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
+ 0xdd, 0x40, 0x0000, 0x0000, gbmsg,
+ sizeof(struct vprbrd_gpiob_msg), 100);
+
+ if (ret != sizeof(struct vprbrd_gpiob_msg))
+ return -EREMOTEIO;
+
+ return 0;
+}
+
+static int vprbrd_gpiob_get(struct gpio_chip *chip,
+ unsigned offset)
+{
+ int ret;
+ u16 val;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpiob);
+ struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
+
+ /* if io is set to output, just return the saved value */
+ if (vb->gpiob_out & (1 << offset))
+ return vb->gpiob_val & (1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
+ 0xdd, 0xc0, 0x0000, 0x0000, gbmsg,
+ sizeof(struct vprbrd_gpiob_msg), 100);
+ val = gbmsg->val;
+
+ mutex_unlock(&vb->lock);
+
+ if (ret != sizeof(struct vprbrd_gpiob_msg))
+ return ret;
+
+ /* cache the read values */
+ vb->gpiob_val = be16_to_cpu(val);
+
+ return (vb->gpiob_val >> offset) & 0x1;
+}
+
+static void vprbrd_gpiob_set(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int ret;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpiob);
+ struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
+
+ if (vb->gpiob_out & (1 << offset)) {
+ if (value)
+ vb->gpiob_val |= (1 << offset);
+ else
+ vb->gpiob_val &= ~(1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ gbmsg->cmd = VPRBRD_GPIOB_CMD_SETVAL;
+ gbmsg->val = cpu_to_be16(value << offset);
+ gbmsg->mask = cpu_to_be16(0x0001 << offset);
+
+ ret = usb_control_msg(vb->usb_dev,
+ usb_sndctrlpipe(vb->usb_dev, 0), 0xdd, 0x40, 0x0000,
+ 0x0000, gbmsg, sizeof(struct vprbrd_gpiob_msg), 100);
+
+ mutex_unlock(&vb->lock);
+
+ if (ret != sizeof(struct vprbrd_gpiob_msg))
+ dev_err(chip->dev, "usb error setting pin value\n");
+ }
+}
+
+static int vprbrd_gpiob_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ int ret;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpiob);
+
+ vb->gpiob_out &= ~(1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ ret = vprbrd_gpiob_setdir(vb, offset, 0);
+
+ mutex_unlock(&vb->lock);
+
+ if (ret)
+ dev_err(chip->dev, "usb error setting pin to input\n");
+
+ return ret;
+}
+
+static int vprbrd_gpiob_direction_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int ret;
+ struct vprbrd *vb = container_of(chip, struct vprbrd, gpiob);
+
+ vb->gpiob_out |= (1 << offset);
+ if (value)
+ vb->gpiob_val |= (1 << offset);
+ else
+ vb->gpiob_val &= ~(1 << offset);
+
+ mutex_lock(&vb->lock);
+
+ ret = vprbrd_gpiob_setdir(vb, offset, 1);
+ if (ret)
+ dev_err(chip->dev, "usb error setting pin to output\n");
+
+ vprbrd_gpiob_set(chip, offset, value);
+
+ mutex_unlock(&vb->lock);
+
+ return ret;
+}
+
+/* ----- end of gpio b layer --------------------------------------------- */
+
+/* ----- begin of i2c layer ---------------------------------------------- */
+
+static int vprbrd_i2c_status(struct i2c_adapter *i2c,
+ struct vprbrd_i2c_status *status, bool prev_error)
+{
+ u16 bytes_xfer;
+ int ret;
+ struct vprbrd *vb = (struct vprbrd *)i2c->algo_data;
+
+ /* check for protocol error */
+ bytes_xfer = sizeof(struct vprbrd_i2c_status);
+
+ ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
+ 0xe9, 0xc0, 0x0000, 0x0000, status, bytes_xfer, 100);
+
+ if (ret != bytes_xfer)
+ prev_error = true;
+
+ if (prev_error) {
+ dev_err(&i2c->dev, "failure in usb communication\n");
+ return -EREMOTEIO;
+ }
+
+ dev_dbg(&i2c->dev, " status = %d\n", status->status);
+ if (status->status != 0x00) {
+ dev_err(&i2c->dev, "failure: i2c protocol error\n");
+ return -EPROTO;
+ }
+ return 0;
+}
+
+static int vprbrd_i2c_receive(struct usb_device *usb_dev,
+ struct vprbrd_i2c_read_msg *rmsg, int bytes_xfer)
+{
+ int ret, bytes_actual;
+ int error = 0;
+
+ /* send the read request */
+ ret = usb_bulk_msg(usb_dev,
+ usb_sndbulkpipe(usb_dev, VIPERBOARD_EP_OUT), rmsg,
+ sizeof(struct vprbrd_i2c_read_hdr), &bytes_actual,
+ 100);
+
+ if ((ret < 0) ||
+ (bytes_actual != sizeof(struct vprbrd_i2c_read_hdr))) {
+ dev_err(&usb_dev->dev, "failure transmitting usb\n");
+ error = -EREMOTEIO;
+ }
+
+ /* read the actual data */
+ ret = usb_bulk_msg(usb_dev,
+ usb_rcvbulkpipe(usb_dev, VIPERBOARD_EP_IN),
+ rmsg, bytes_xfer, &bytes_actual, 100);
+
+ if ((ret < 0) ||
+ (bytes_xfer != bytes_actual)) {
+ dev_err(&usb_dev->dev, "failure receiving usb\n");
+ error = -EREMOTEIO;
+ }
+ return error;
+}
+
+static int vprbrd_i2c_addr(struct usb_device *usb_dev,
+ struct vprbrd_i2c_addr_msg *amsg)
+{
+ int ret, bytes_actual;
+
+ ret = usb_bulk_msg(usb_dev,
+ usb_sndbulkpipe(usb_dev, VIPERBOARD_EP_OUT),
+ amsg, sizeof(struct vprbrd_i2c_addr_msg),
+ &bytes_actual, 100);
+
+ if ((ret < 0) ||
+ (sizeof(struct vprbrd_i2c_addr_msg) != bytes_actual)) {
+ dev_err(&usb_dev->dev, "failure transmitting usb\n");
+ return -EREMOTEIO;
+ }
+ return 0;
+}
+
+static int vprbrd_i2c_read(struct vprbrd *vb, struct i2c_msg *msg)
+{
+ int ret;
+ u16 remain_len, bytes_xfer, len1, len2,
+ start = 0x0000;
+ struct vprbrd_i2c_read_msg *rmsg =
+ (struct vprbrd_i2c_read_msg *)vb->buf;
+
+ remain_len = msg->len;
+ rmsg->header.cmd = VIPERBOARD_I2C_CMD_READ;
+ while (remain_len > 0) {
+ rmsg->header.addr = cpu_to_le16(start + 0x4000);
+ if (remain_len <= 255) {
+ len1 = remain_len;
+ len2 = 0x00;
+ rmsg->header.len0 = remain_len;
+ rmsg->header.len1 = 0x00;
+ rmsg->header.len2 = 0x00;
+ rmsg->header.len3 = 0x00;
+ rmsg->header.len4 = 0x00;
+ rmsg->header.len5 = 0x00;
+ remain_len = 0;
+ } else if (remain_len <= 510) {
+ len1 = remain_len;
+ len2 = 0x00;
+ rmsg->header.len0 = remain_len - 255;
+ rmsg->header.len1 = 0xff;
+ rmsg->header.len2 = 0x00;
+ rmsg->header.len3 = 0x00;
+ rmsg->header.len4 = 0x00;
+ rmsg->header.len5 = 0x00;
+ remain_len = 0;
+ } else if (remain_len <= 512) {
+ len1 = remain_len;
+ len2 = 0x00;
+ rmsg->header.len0 = remain_len - 510;
+ rmsg->header.len1 = 0xff;
+ rmsg->header.len2 = 0xff;
+ rmsg->header.len3 = 0x00;
+ rmsg->header.len4 = 0x00;
+ rmsg->header.len5 = 0x00;
+ remain_len = 0;
+ } else if (remain_len <= 767) {
+ len1 = 512;
+ len2 = remain_len - 512;
+ rmsg->header.len0 = 0x02;
+ rmsg->header.len1 = 0xff;
+ rmsg->header.len2 = 0xff;
+ rmsg->header.len3 = remain_len - 512;
+ rmsg->header.len4 = 0x00;
+ rmsg->header.len5 = 0x00;
+ bytes_xfer = remain_len;
+ remain_len = 0;
+ } else if (remain_len <= 1022) {
+ len1 = 512;
+ len2 = remain_len - 512;
+ rmsg->header.len0 = 0x02;
+ rmsg->header.len1 = 0xff;
+ rmsg->header.len2 = 0xff;
+ rmsg->header.len3 = remain_len - 767;
+ rmsg->header.len4 = 0xff;
+ rmsg->header.len5 = 0x00;
+ remain_len = 0;
+ } else if (remain_len <= 1024) {
+ len1 = 512;
+ len2 = remain_len - 512;
+ rmsg->header.len0 = 0x02;
+ rmsg->header.len1 = 0xff;
+ rmsg->header.len2 = 0xff;
+ rmsg->header.len3 = remain_len - 1022;
+ rmsg->header.len4 = 0xff;
+ rmsg->header.len5 = 0xff;
+ remain_len = 0;
+ } else {
+ len1 = 512;
+ len2 = 512;
+ rmsg->header.len0 = 0x02;
+ rmsg->header.len1 = 0xff;
+ rmsg->header.len2 = 0xff;
+ rmsg->header.len3 = 0x02;
+ rmsg->header.len4 = 0xff;
+ rmsg->header.len5 = 0xff;
+ remain_len -= 1024;
+ start += 1024;
+ }
+ rmsg->header.tf1 = cpu_to_le16(len1);
+ rmsg->header.tf2 = cpu_to_le16(len2);
+
+ /* first read transfer */
+ ret = vprbrd_i2c_receive(vb->usb_dev, rmsg, len1);
+ if (ret < 0)
+ return ret;
+ /* copy the received data */
+ memcpy(msg->buf + start, rmsg, len1);
+
+ /* second read transfer if neccessary */
+ if (len2 > 0) {
+ ret = vprbrd_i2c_receive(vb->usb_dev, rmsg, len2);
+ if (ret < 0)
+ return ret;
+ /* copy the received data */
+ memcpy(msg->buf + start + 512, rmsg, len2);
+ }
+ }
+ return 0;
+}
+
+static int vprbrd_i2c_write(struct vprbrd *vb, struct i2c_msg *msg)
+{
+ int ret, bytes_actual;
+ u16 remain_len, bytes_xfer,
+ start = 0x0000;
+ struct vprbrd_i2c_write_msg *wmsg =
+ (struct vprbrd_i2c_write_msg *)vb->buf;
+
+ remain_len = msg->len;
+ wmsg->header.cmd = VIPERBOARD_I2C_CMD_WRITE;
+ wmsg->header.last = 0x00;
+ wmsg->header.chan = 0x00;
+ wmsg->header.spi = 0x0000;
+ while (remain_len > 0) {
+ wmsg->header.addr = cpu_to_le16(start + 0x4000);
+ if (remain_len > 503) {
+ wmsg->header.len1 = 0xff;
+ wmsg->header.len2 = 0xf8;
+ remain_len -= 503;
+ bytes_xfer = 503 + sizeof(struct vprbrd_i2c_write_hdr);
+ start += 503;
+ } else if (remain_len > 255) {
+ wmsg->header.len1 = 0xff;
+ wmsg->header.len2 = (remain_len - 255);
+ bytes_xfer = remain_len +
+ sizeof(struct vprbrd_i2c_write_hdr);
+ remain_len = 0;
+ } else {
+ wmsg->header.len1 = remain_len;
+ wmsg->header.len2 = 0x00;
+ bytes_xfer = remain_len +
+ sizeof(struct vprbrd_i2c_write_hdr);
+ remain_len = 0;
+ }
+ memcpy(wmsg->data, msg->buf + start,
+ bytes_xfer -
+ sizeof(struct vprbrd_i2c_write_hdr));
+
+ ret = usb_bulk_msg(vb->usb_dev,
+ usb_sndbulkpipe(vb->usb_dev,
+ VIPERBOARD_EP_OUT),
+ wmsg, bytes_xfer, &bytes_actual, 100);
+ if ((ret < 0) || (bytes_xfer != bytes_actual))
+ return -EREMOTEIO;
+ }
+ return 0;
+}
+
+static int vprbrd_i2c_xfer(struct i2c_adapter *i2c, struct i2c_msg *msgs,
+ int num)
+{
+ struct i2c_msg *pmsg;
+ int i, ret,
+ error = 0;
+ struct vprbrd *vb = (struct vprbrd *)i2c->algo_data;
+ struct vprbrd_i2c_addr_msg *amsg =
+ (struct vprbrd_i2c_addr_msg *)vb->buf;
+ struct vprbrd_i2c_status *smsg = (struct vprbrd_i2c_status *)vb->buf;
+
+ dev_dbg(&i2c->dev, "master xfer %d messages:\n", num);
+
+ for (i = 0 ; i < num ; i++) {
+ pmsg = &msgs[i];
+
+ dev_dbg(&i2c->dev,
+ " %d: %s (flags %d) %d bytes to 0x%02x\n",
+ i, pmsg->flags & I2C_M_RD ? "read" : "write",
+ pmsg->flags, pmsg->len, pmsg->addr);
+
+ /* msgs longer than 2048 bytes are not supported by adapter */
+ if (pmsg->len > 2048)
+ return -EINVAL;
+
+ mutex_lock(&vb->lock);
+ /* directly send the message */
+ if (pmsg->flags & I2C_M_RD) {
+ /* read data */
+ amsg->cmd = VIPERBOARD_I2C_CMD_ADDR;
+ amsg->unknown2 = 0x00;
+ amsg->unknown3 = 0x00;
+ amsg->addr = pmsg->addr;
+ amsg->unknown1 = 0x01;
+ amsg->len = cpu_to_le16(pmsg->len);
+ /* send the addr and len, we're interested to board */
+ ret = vprbrd_i2c_addr(vb->usb_dev, amsg);
+ if (ret < 0)
+ error = ret;
+
+ ret = vprbrd_i2c_read(vb, pmsg);
+ if (ret < 0)
+ error = ret;
+
+ ret = vprbrd_i2c_status(i2c, smsg, error);
+ if (ret < 0)
+ error = ret;
+ /* in case of protocol error, return the error */
+ if (error < 0)
+ goto error;
+ } else {
+ /* write data */
+ ret = vprbrd_i2c_write(vb, pmsg);
+
+ amsg->cmd = VIPERBOARD_I2C_CMD_ADDR;
+ amsg->unknown2 = 0x00;
+ amsg->unknown3 = 0x00;
+ amsg->addr = pmsg->addr;
+ amsg->unknown1 = 0x00;
+ amsg->len = cpu_to_le16(pmsg->len);
+ /* send the addr, the data goes to to board */
+ ret = vprbrd_i2c_addr(vb->usb_dev, amsg);
+ if (ret < 0)
+ error = ret;
+
+ ret = vprbrd_i2c_status(i2c, smsg, error);
+ if (ret < 0)
+ error = ret;
+
+ if (error < 0)
+ goto error;
+ }
+ mutex_unlock(&vb->lock);
+ }
+ return 0;
+error:
+ mutex_unlock(&vb->lock);
+ return error;
+}
+
+static u32 vprbrd_i2c_func(struct i2c_adapter *i2c)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+/* This is the actual algorithm we define */
+static const struct i2c_algorithm vprbrd_algorithm = {
+ .master_xfer = vprbrd_i2c_xfer,
+ .functionality = vprbrd_i2c_func,
+};
+
+/* ----- end of i2c layer ------------------------------------------------ */
+
+/* ----- begin of usb layer ---------------------------------------------- */
+
+static const struct usb_device_id vprbrd_table[] = {
+ { USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, vprbrd_table);
+
+static void vprbrd_free(struct vprbrd *dev)
+{
+ usb_put_dev(dev->usb_dev);
+ kfree(dev);
+}
+
+static int vprbrd_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct vprbrd *vb;
+ struct vprbrd_adc_info *adc;
+ struct iio_dev *iodev;
+
+ int retval = -ENOMEM;
+ u16 version = 0;
+ int pipe;
+ 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");
+ goto error;
+ }
+
+ 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);
+
+ /* get version information, major first, minor then */
+ pipe = usb_rcvctrlpipe(vb->usb_dev, 0);
+ retval = usb_control_msg(vb->usb_dev, pipe, 0xea, 0xc0, 0x0000,
+ 0x0000, buf, 1, 100);
+ if (retval == 1)
+ version = buf[0];
+ retval = usb_control_msg(vb->usb_dev, pipe, 0xeb, 0xc0, 0x0000,
+ 0x0000, buf, 1, 100);
+ if (retval == 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);
+
+ /* setup i2c adapter description */
+ vb->i2c.owner = THIS_MODULE;
+ vb->i2c.class = I2C_CLASS_HWMON;
+ vb->i2c.algo = &vprbrd_algorithm;
+ vb->i2c.algo_data = vb;
+ snprintf(vb->i2c.name, sizeof(vb->i2c.name),
+ "viperboard at bus %03d device %03d",
+ vb->usb_dev->bus->busnum, vb->usb_dev->devnum);
+
+ /* setting the bus frequency */
+ if ((i2c_bus_freq <= VIPERBOARD_I2C_FREQ_10KHZ)
+ && (i2c_bus_freq >= VIPERBOARD_I2C_FREQ_6MHZ)) {
+ pipe = usb_sndctrlpipe(vb->usb_dev, 0);
+ retval = usb_control_msg(vb->usb_dev, pipe, 0xe6, 0x40,
+ 0x0000, 0x0000, &i2c_bus_freq, 1, 100);
+ if (retval != 1) {
+ dev_err(&vb->i2c.dev,
+ "failure setting i2c_bus_freq to %d\n",
+ i2c_bus_freq);
+ retval = -EIO;
+ goto error;
+ }
+ } else {
+ dev_err(&vb->i2c.dev,
+ "invalid i2c_bus_freq setting:%d\n",
+ i2c_bus_freq);
+ retval = -EIO;
+ goto error;
+ }
+
+ vb->i2c.dev.parent = &interface->dev;
+
+ /* and finally attach to i2c layer */
+ i2c_add_adapter(&vb->i2c);
+
+ /* registering gpio a */
+ vb->gpioa.label = "viperboard gpio a";
+ vb->gpioa.dev = &interface->dev;
+ vb->gpioa.owner = THIS_MODULE;
+ vb->gpioa.base = -1;
+ vb->gpioa.ngpio = 16;
+ vb->gpioa.can_sleep = 1;
+ vb->gpioa.set = vprbrd_gpioa_set;
+ vb->gpioa.get = vprbrd_gpioa_get;
+ vb->gpioa.direction_input = vprbrd_gpioa_direction_input;
+ vb->gpioa.direction_output = vprbrd_gpioa_direction_output;
+ retval = gpiochip_add(&vb->gpioa);
+ if (retval < 0) {
+ dev_err(vb->gpioa.dev, "could not add gpio a");
+ retval = -EIO;
+ goto err_gpioa;
+ }
+
+ /* registering gpio b */
+ vb->gpiob.label = "viperboard gpio b";
+ vb->gpiob.dev = &interface->dev;
+ vb->gpiob.owner = THIS_MODULE;
+ vb->gpiob.base = -1;
+ vb->gpiob.ngpio = 16;
+ vb->gpiob.can_sleep = 1;
+ vb->gpiob.set = vprbrd_gpiob_set;
+ vb->gpiob.get = vprbrd_gpiob_get;
+ vb->gpiob.direction_input = vprbrd_gpiob_direction_input;
+ vb->gpiob.direction_output = vprbrd_gpiob_direction_output;
+ retval = gpiochip_add(&vb->gpiob);
+ if (retval < 0) {
+ dev_err(vb->gpiob.dev, "could not add gpio b");
+ retval = -EIO;
+ goto err_gpiob;
+ }
+
+ /* registering iio */
+ iodev = iio_device_alloc(sizeof(struct vprbrd_adc_info));
+ if (!iodev) {
+ dev_err(&interface->dev, "failed allocating iio device\n");
+ retval = -ENOMEM;
+ goto err_gpioa;
+ }
+
+ adc = iio_priv(iodev);
+ adc->vb = vb;
+ iodev->name = "viperboard adc";
+ iodev->dev.parent = &interface->dev;
+ iodev->info = &vprbrd_adc_iio_info;
+ iodev->modes = INDIO_DIRECT_MODE;
+ iodev->channels = vprbrd_adc_iio_channels;
+ iodev->num_channels = ARRAY_SIZE(vprbrd_adc_iio_channels);
+
+ retval = iio_device_register(iodev);
+ if (retval) {
+ dev_err(&interface->dev, "could not register iio (adc)");
+ goto err_iio;
+ }
+ vb->iio = iodev;
+
+ return 0;
+err_iio:
+ iio_device_free(iodev);
+
+err_gpiob:
+ if (vb->gpiob.base >= 0)
+ pipe = gpiochip_remove(&vb->gpiob);
+
+err_gpioa:
+ if (vb->gpioa.base >= 0)
+ pipe = gpiochip_remove(&vb->gpioa);
+
+error:
+ if (vb)
+ vprbrd_free(vb);
+
+ return retval;
+}
+
+static void vprbrd_disconnect(struct usb_interface *interface)
+{
+ int retval;
+ struct vprbrd *vb = usb_get_intfdata(interface);
+
+ iio_device_unregister(vb->iio);
+ iio_device_free(vb->iio);
+ if (vb->gpiob.base >= 0)
+ retval = gpiochip_remove(&vb->gpiob);
+ if (vb->gpioa.base >= 0)
+ retval = gpiochip_remove(&vb->gpioa);
+ i2c_del_adapter(&vb->i2c);
+ usb_set_intfdata(interface, NULL);
+ vprbrd_free(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);
+
+/* ----- end of usb layer ------------------------------------------------ */
+
+
+MODULE_DESCRIPTION("Nano River Technologies viperboard driver");
+MODULE_AUTHOR("Lars Poeschel <poeschel@...onage.de>");
+MODULE_LICENSE("GPL");
--
1.7.10.4
--
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