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479 lines
12 KiB
479 lines
12 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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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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