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/*
* Nano River Technologies viperboard GPIO lib driver
*
* (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/platform_device.h>
#include <linux/usb.h>
#include <linux/gpio.h>
#include <linux/mfd/viperboard.h>
#define VPRBRD_GPIOA_CLK_1MHZ 0
#define VPRBRD_GPIOA_CLK_100KHZ 1
#define VPRBRD_GPIOA_CLK_10KHZ 2
#define VPRBRD_GPIOA_CLK_1KHZ 3
#define VPRBRD_GPIOA_CLK_100HZ 4
#define VPRBRD_GPIOA_CLK_10HZ 5
#define VPRBRD_GPIOA_FREQ_DEFAULT 1000
#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
struct 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;
} __packed;
struct vprbrd_gpiob_msg {
u8 cmd;
u16 val;
u16 mask;
} __packed;
struct vprbrd_gpio {
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 vprbrd *vb;
};
/* gpioa sampling clock module parameter */
static unsigned char gpioa_clk;
static unsigned int gpioa_freq = VPRBRD_GPIOA_FREQ_DEFAULT;
module_param(gpioa_freq, uint, 0);
MODULE_PARM_DESC(gpioa_freq,
"gpio-a sampling freq in Hz (default is 1000Hz) valid values: 10, 100, 1000, 10000, 100000, 1000000");
/* ----- begin of gipo a chip -------------------------------------------- */
static int vprbrd_gpioa_get(struct gpio_chip *chip,
unsigned offset)
{
int ret, answer, error = 0;
struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
struct vprbrd *vb = gpio->vb;
struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
/* if io is set to output, just return the saved value */
if (gpio->gpioa_out & (1 << offset))
return !!(gpio->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),
VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
VPRBRD_USB_TIMEOUT_MS);
if (ret != sizeof(struct vprbrd_gpioa_msg))
error = -EREMOTEIO;
ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_IN, 0x0000,
0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
VPRBRD_USB_TIMEOUT_MS);
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_gpio *gpio = gpiochip_get_data(chip);
struct vprbrd *vb = gpio->vb;
struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
if (gpio->gpioa_out & (1 << offset)) {
if (value)
gpio->gpioa_val |= (1 << offset);
else
gpio->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),
VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT,
0x0000, 0x0000, gamsg,
sizeof(struct vprbrd_gpioa_msg), VPRBRD_USB_TIMEOUT_MS);
mutex_unlock(&vb->lock);
if (ret != sizeof(struct vprbrd_gpioa_msg))
dev_err(chip->parent, "usb error setting pin value\n");
}
}
static int vprbrd_gpioa_direction_input(struct gpio_chip *chip,
unsigned offset)
{
int ret;
struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
struct vprbrd *vb = gpio->vb;
struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
gpio->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),
VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
VPRBRD_USB_TIMEOUT_MS);
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_gpio *gpio = gpiochip_get_data(chip);
struct vprbrd *vb = gpio->vb;
struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
gpio->gpioa_out |= (1 << offset);
if (value)
gpio->gpioa_val |= (1 << offset);
else
gpio->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
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