480 lines
12 KiB
C
480 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Nano River Technologies viperboard GPIO lib driver
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*
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* (C) 2012 by Lemonage GmbH
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* Author: Lars Poeschel <poeschel@lemonage.de>
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* All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/usb.h>
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#include <linux/gpio/driver.h>
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#include <linux/mfd/viperboard.h>
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#define VPRBRD_GPIOA_CLK_1MHZ 0
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#define VPRBRD_GPIOA_CLK_100KHZ 1
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#define VPRBRD_GPIOA_CLK_10KHZ 2
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#define VPRBRD_GPIOA_CLK_1KHZ 3
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#define VPRBRD_GPIOA_CLK_100HZ 4
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#define VPRBRD_GPIOA_CLK_10HZ 5
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#define VPRBRD_GPIOA_FREQ_DEFAULT 1000
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#define VPRBRD_GPIOA_CMD_CONT 0x00
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#define VPRBRD_GPIOA_CMD_PULSE 0x01
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#define VPRBRD_GPIOA_CMD_PWM 0x02
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#define VPRBRD_GPIOA_CMD_SETOUT 0x03
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#define VPRBRD_GPIOA_CMD_SETIN 0x04
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#define VPRBRD_GPIOA_CMD_SETINT 0x05
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#define VPRBRD_GPIOA_CMD_GETIN 0x06
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#define VPRBRD_GPIOB_CMD_SETDIR 0x00
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#define VPRBRD_GPIOB_CMD_SETVAL 0x01
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struct vprbrd_gpioa_msg {
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u8 cmd;
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u8 clk;
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u8 offset;
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u8 t1;
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u8 t2;
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u8 invert;
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u8 pwmlevel;
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u8 outval;
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u8 risefall;
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u8 answer;
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u8 __fill;
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} __packed;
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struct vprbrd_gpiob_msg {
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u8 cmd;
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u16 val;
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u16 mask;
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} __packed;
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struct vprbrd_gpio {
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struct gpio_chip gpioa; /* gpio a related things */
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u32 gpioa_out;
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u32 gpioa_val;
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struct gpio_chip gpiob; /* gpio b related things */
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u32 gpiob_out;
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u32 gpiob_val;
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struct vprbrd *vb;
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};
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/* gpioa sampling clock module parameter */
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static unsigned char gpioa_clk;
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static unsigned int gpioa_freq = VPRBRD_GPIOA_FREQ_DEFAULT;
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module_param(gpioa_freq, uint, 0);
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MODULE_PARM_DESC(gpioa_freq,
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"gpio-a sampling freq in Hz (default is 1000Hz) valid values: 10, 100, 1000, 10000, 100000, 1000000");
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/* ----- begin of gipo a chip -------------------------------------------- */
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static int vprbrd_gpioa_get(struct gpio_chip *chip,
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unsigned int offset)
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{
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int ret, answer, error = 0;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
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/* if io is set to output, just return the saved value */
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if (gpio->gpioa_out & (1 << offset))
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return !!(gpio->gpioa_val & (1 << offset));
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mutex_lock(&vb->lock);
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gamsg->cmd = VPRBRD_GPIOA_CMD_GETIN;
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gamsg->clk = 0x00;
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gamsg->offset = offset;
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gamsg->t1 = 0x00;
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gamsg->t2 = 0x00;
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gamsg->invert = 0x00;
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gamsg->pwmlevel = 0x00;
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gamsg->outval = 0x00;
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gamsg->risefall = 0x00;
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gamsg->answer = 0x00;
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gamsg->__fill = 0x00;
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ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
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0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
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VPRBRD_USB_TIMEOUT_MS);
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if (ret != sizeof(struct vprbrd_gpioa_msg))
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error = -EREMOTEIO;
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ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_IN, 0x0000,
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0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
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VPRBRD_USB_TIMEOUT_MS);
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answer = gamsg->answer & 0x01;
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mutex_unlock(&vb->lock);
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if (ret != sizeof(struct vprbrd_gpioa_msg))
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error = -EREMOTEIO;
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if (error)
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return error;
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return answer;
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}
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static void vprbrd_gpioa_set(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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int ret;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
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if (gpio->gpioa_out & (1 << offset)) {
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if (value)
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gpio->gpioa_val |= (1 << offset);
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else
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gpio->gpioa_val &= ~(1 << offset);
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mutex_lock(&vb->lock);
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gamsg->cmd = VPRBRD_GPIOA_CMD_SETOUT;
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gamsg->clk = 0x00;
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gamsg->offset = offset;
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gamsg->t1 = 0x00;
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gamsg->t2 = 0x00;
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gamsg->invert = 0x00;
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gamsg->pwmlevel = 0x00;
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gamsg->outval = value;
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gamsg->risefall = 0x00;
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gamsg->answer = 0x00;
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gamsg->__fill = 0x00;
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ret = usb_control_msg(vb->usb_dev,
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usb_sndctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT,
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0x0000, 0x0000, gamsg,
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sizeof(struct vprbrd_gpioa_msg), VPRBRD_USB_TIMEOUT_MS);
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mutex_unlock(&vb->lock);
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if (ret != sizeof(struct vprbrd_gpioa_msg))
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dev_err(chip->parent, "usb error setting pin value\n");
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}
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}
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static int vprbrd_gpioa_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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int ret;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
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gpio->gpioa_out &= ~(1 << offset);
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mutex_lock(&vb->lock);
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gamsg->cmd = VPRBRD_GPIOA_CMD_SETIN;
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gamsg->clk = gpioa_clk;
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gamsg->offset = offset;
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gamsg->t1 = 0x00;
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gamsg->t2 = 0x00;
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gamsg->invert = 0x00;
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gamsg->pwmlevel = 0x00;
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gamsg->outval = 0x00;
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gamsg->risefall = 0x00;
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gamsg->answer = 0x00;
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gamsg->__fill = 0x00;
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ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
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0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
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VPRBRD_USB_TIMEOUT_MS);
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mutex_unlock(&vb->lock);
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if (ret != sizeof(struct vprbrd_gpioa_msg))
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return -EREMOTEIO;
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return 0;
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}
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static int vprbrd_gpioa_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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int ret;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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struct vprbrd_gpioa_msg *gamsg = (struct vprbrd_gpioa_msg *)vb->buf;
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gpio->gpioa_out |= (1 << offset);
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if (value)
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gpio->gpioa_val |= (1 << offset);
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else
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gpio->gpioa_val &= ~(1 << offset);
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mutex_lock(&vb->lock);
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gamsg->cmd = VPRBRD_GPIOA_CMD_SETOUT;
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gamsg->clk = 0x00;
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gamsg->offset = offset;
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gamsg->t1 = 0x00;
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gamsg->t2 = 0x00;
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gamsg->invert = 0x00;
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gamsg->pwmlevel = 0x00;
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gamsg->outval = value;
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gamsg->risefall = 0x00;
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gamsg->answer = 0x00;
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gamsg->__fill = 0x00;
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ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOA, VPRBRD_USB_TYPE_OUT, 0x0000,
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0x0000, gamsg, sizeof(struct vprbrd_gpioa_msg),
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VPRBRD_USB_TIMEOUT_MS);
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mutex_unlock(&vb->lock);
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if (ret != sizeof(struct vprbrd_gpioa_msg))
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return -EREMOTEIO;
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return 0;
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}
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/* ----- end of gpio a chip ---------------------------------------------- */
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/* ----- begin of gipo b chip -------------------------------------------- */
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static int vprbrd_gpiob_setdir(struct vprbrd *vb, unsigned int offset,
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unsigned int dir)
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{
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struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
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int ret;
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gbmsg->cmd = VPRBRD_GPIOB_CMD_SETDIR;
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gbmsg->val = cpu_to_be16(dir << offset);
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gbmsg->mask = cpu_to_be16(0x0001 << offset);
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ret = usb_control_msg(vb->usb_dev, usb_sndctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOB, VPRBRD_USB_TYPE_OUT, 0x0000,
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0x0000, gbmsg, sizeof(struct vprbrd_gpiob_msg),
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VPRBRD_USB_TIMEOUT_MS);
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if (ret != sizeof(struct vprbrd_gpiob_msg))
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return -EREMOTEIO;
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return 0;
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}
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static int vprbrd_gpiob_get(struct gpio_chip *chip,
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unsigned int offset)
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{
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int ret;
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u16 val;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
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/* if io is set to output, just return the saved value */
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if (gpio->gpiob_out & (1 << offset))
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return gpio->gpiob_val & (1 << offset);
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mutex_lock(&vb->lock);
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ret = usb_control_msg(vb->usb_dev, usb_rcvctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOB, VPRBRD_USB_TYPE_IN, 0x0000,
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0x0000, gbmsg, sizeof(struct vprbrd_gpiob_msg),
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VPRBRD_USB_TIMEOUT_MS);
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val = gbmsg->val;
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mutex_unlock(&vb->lock);
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if (ret != sizeof(struct vprbrd_gpiob_msg))
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return ret;
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/* cache the read values */
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gpio->gpiob_val = be16_to_cpu(val);
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return (gpio->gpiob_val >> offset) & 0x1;
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}
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static void vprbrd_gpiob_set(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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int ret;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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struct vprbrd_gpiob_msg *gbmsg = (struct vprbrd_gpiob_msg *)vb->buf;
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if (gpio->gpiob_out & (1 << offset)) {
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if (value)
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gpio->gpiob_val |= (1 << offset);
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else
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gpio->gpiob_val &= ~(1 << offset);
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mutex_lock(&vb->lock);
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gbmsg->cmd = VPRBRD_GPIOB_CMD_SETVAL;
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gbmsg->val = cpu_to_be16(value << offset);
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gbmsg->mask = cpu_to_be16(0x0001 << offset);
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ret = usb_control_msg(vb->usb_dev,
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usb_sndctrlpipe(vb->usb_dev, 0),
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VPRBRD_USB_REQUEST_GPIOB, VPRBRD_USB_TYPE_OUT,
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0x0000, 0x0000, gbmsg,
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sizeof(struct vprbrd_gpiob_msg), VPRBRD_USB_TIMEOUT_MS);
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mutex_unlock(&vb->lock);
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if (ret != sizeof(struct vprbrd_gpiob_msg))
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dev_err(chip->parent, "usb error setting pin value\n");
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}
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}
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static int vprbrd_gpiob_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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int ret;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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gpio->gpiob_out &= ~(1 << offset);
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mutex_lock(&vb->lock);
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ret = vprbrd_gpiob_setdir(vb, offset, 0);
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mutex_unlock(&vb->lock);
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if (ret)
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dev_err(chip->parent, "usb error setting pin to input\n");
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return ret;
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}
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static int vprbrd_gpiob_direction_output(struct gpio_chip *chip,
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unsigned int offset, int value)
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{
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int ret;
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struct vprbrd_gpio *gpio = gpiochip_get_data(chip);
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struct vprbrd *vb = gpio->vb;
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gpio->gpiob_out |= (1 << offset);
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mutex_lock(&vb->lock);
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ret = vprbrd_gpiob_setdir(vb, offset, 1);
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if (ret)
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dev_err(chip->parent, "usb error setting pin to output\n");
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mutex_unlock(&vb->lock);
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vprbrd_gpiob_set(chip, offset, value);
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return ret;
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}
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/* ----- end of gpio b chip ---------------------------------------------- */
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static int vprbrd_gpio_probe(struct platform_device *pdev)
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{
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struct vprbrd *vb = dev_get_drvdata(pdev->dev.parent);
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struct vprbrd_gpio *vb_gpio;
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int ret;
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vb_gpio = devm_kzalloc(&pdev->dev, sizeof(*vb_gpio), GFP_KERNEL);
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if (vb_gpio == NULL)
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return -ENOMEM;
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vb_gpio->vb = vb;
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/* registering gpio a */
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vb_gpio->gpioa.label = "viperboard gpio a";
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vb_gpio->gpioa.parent = &pdev->dev;
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vb_gpio->gpioa.owner = THIS_MODULE;
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vb_gpio->gpioa.base = -1;
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vb_gpio->gpioa.ngpio = 16;
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vb_gpio->gpioa.can_sleep = true;
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vb_gpio->gpioa.set = vprbrd_gpioa_set;
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vb_gpio->gpioa.get = vprbrd_gpioa_get;
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vb_gpio->gpioa.direction_input = vprbrd_gpioa_direction_input;
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vb_gpio->gpioa.direction_output = vprbrd_gpioa_direction_output;
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ret = devm_gpiochip_add_data(&pdev->dev, &vb_gpio->gpioa, vb_gpio);
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if (ret < 0) {
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dev_err(vb_gpio->gpioa.parent, "could not add gpio a");
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return ret;
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}
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/* registering gpio b */
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vb_gpio->gpiob.label = "viperboard gpio b";
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vb_gpio->gpiob.parent = &pdev->dev;
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vb_gpio->gpiob.owner = THIS_MODULE;
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vb_gpio->gpiob.base = -1;
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vb_gpio->gpiob.ngpio = 16;
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vb_gpio->gpiob.can_sleep = true;
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vb_gpio->gpiob.set = vprbrd_gpiob_set;
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vb_gpio->gpiob.get = vprbrd_gpiob_get;
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vb_gpio->gpiob.direction_input = vprbrd_gpiob_direction_input;
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vb_gpio->gpiob.direction_output = vprbrd_gpiob_direction_output;
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ret = devm_gpiochip_add_data(&pdev->dev, &vb_gpio->gpiob, vb_gpio);
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if (ret < 0) {
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dev_err(vb_gpio->gpiob.parent, "could not add gpio b");
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return ret;
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}
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platform_set_drvdata(pdev, vb_gpio);
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return ret;
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}
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static struct platform_driver vprbrd_gpio_driver = {
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.driver.name = "viperboard-gpio",
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.probe = vprbrd_gpio_probe,
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};
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static int __init vprbrd_gpio_init(void)
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{
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switch (gpioa_freq) {
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case 1000000:
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gpioa_clk = VPRBRD_GPIOA_CLK_1MHZ;
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break;
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case 100000:
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gpioa_clk = VPRBRD_GPIOA_CLK_100KHZ;
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break;
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case 10000:
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gpioa_clk = VPRBRD_GPIOA_CLK_10KHZ;
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break;
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case 1000:
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gpioa_clk = VPRBRD_GPIOA_CLK_1KHZ;
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break;
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case 100:
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gpioa_clk = VPRBRD_GPIOA_CLK_100HZ;
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break;
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case 10:
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gpioa_clk = VPRBRD_GPIOA_CLK_10HZ;
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break;
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default:
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pr_warn("invalid gpioa_freq (%d)\n", gpioa_freq);
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gpioa_clk = VPRBRD_GPIOA_CLK_1KHZ;
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}
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return platform_driver_register(&vprbrd_gpio_driver);
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}
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subsys_initcall(vprbrd_gpio_init);
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static void __exit vprbrd_gpio_exit(void)
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{
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platform_driver_unregister(&vprbrd_gpio_driver);
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}
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module_exit(vprbrd_gpio_exit);
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MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
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MODULE_DESCRIPTION("GPIO driver for Nano River Techs Viperboard");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:viperboard-gpio");
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