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448cf90513
GPIO library does copy the of_node from the parent device of the GPIO chip, there is no need to repeat this in the individual drivers. Remove these assignment all at once. For the details one may look into the of_gpio_dev_init() implementation. While at it, remove duplicate parent device assignment where it is the case. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-By: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
256 lines
6.2 KiB
C
256 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Raspberry Pi 3 expander GPIO driver
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*
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* Uses the firmware mailbox service to communicate with the
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* GPIO expander on the VPU.
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*
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* Copyright (C) 2017 Raspberry Pi Trading Ltd.
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*/
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#include <linux/err.h>
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#include <linux/gpio/driver.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <soc/bcm2835/raspberrypi-firmware.h>
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#define MODULE_NAME "raspberrypi-exp-gpio"
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#define NUM_GPIO 8
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#define RPI_EXP_GPIO_BASE 128
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#define RPI_EXP_GPIO_DIR_IN 0
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#define RPI_EXP_GPIO_DIR_OUT 1
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struct rpi_exp_gpio {
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struct gpio_chip gc;
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struct rpi_firmware *fw;
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};
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/* VC4 firmware mailbox interface data structures */
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struct gpio_set_config {
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u32 gpio;
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u32 direction;
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u32 polarity;
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u32 term_en;
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u32 term_pull_up;
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u32 state;
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};
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struct gpio_get_config {
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u32 gpio;
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u32 direction;
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u32 polarity;
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u32 term_en;
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u32 term_pull_up;
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};
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struct gpio_get_set_state {
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u32 gpio;
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u32 state;
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};
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static int rpi_exp_gpio_get_polarity(struct gpio_chip *gc, unsigned int off)
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{
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struct rpi_exp_gpio *gpio;
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struct gpio_get_config get;
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int ret;
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gpio = gpiochip_get_data(gc);
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get.gpio = off + RPI_EXP_GPIO_BASE; /* GPIO to update */
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ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG,
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&get, sizeof(get));
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if (ret || get.gpio != 0) {
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dev_err(gc->parent, "Failed to get GPIO %u config (%d %x)\n",
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off, ret, get.gpio);
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return ret ? ret : -EIO;
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}
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return get.polarity;
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}
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static int rpi_exp_gpio_dir_in(struct gpio_chip *gc, unsigned int off)
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{
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struct rpi_exp_gpio *gpio;
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struct gpio_set_config set_in;
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int ret;
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gpio = gpiochip_get_data(gc);
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set_in.gpio = off + RPI_EXP_GPIO_BASE; /* GPIO to update */
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set_in.direction = RPI_EXP_GPIO_DIR_IN;
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set_in.term_en = 0; /* termination disabled */
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set_in.term_pull_up = 0; /* n/a as termination disabled */
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set_in.state = 0; /* n/a as configured as an input */
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ret = rpi_exp_gpio_get_polarity(gc, off);
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if (ret < 0)
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return ret;
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set_in.polarity = ret; /* Retain existing setting */
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ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG,
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&set_in, sizeof(set_in));
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if (ret || set_in.gpio != 0) {
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dev_err(gc->parent, "Failed to set GPIO %u to input (%d %x)\n",
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off, ret, set_in.gpio);
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return ret ? ret : -EIO;
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}
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return 0;
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}
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static int rpi_exp_gpio_dir_out(struct gpio_chip *gc, unsigned int off, int val)
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{
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struct rpi_exp_gpio *gpio;
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struct gpio_set_config set_out;
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int ret;
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gpio = gpiochip_get_data(gc);
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set_out.gpio = off + RPI_EXP_GPIO_BASE; /* GPIO to update */
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set_out.direction = RPI_EXP_GPIO_DIR_OUT;
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set_out.term_en = 0; /* n/a as an output */
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set_out.term_pull_up = 0; /* n/a as termination disabled */
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set_out.state = val; /* Output state */
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ret = rpi_exp_gpio_get_polarity(gc, off);
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if (ret < 0)
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return ret;
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set_out.polarity = ret; /* Retain existing setting */
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ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG,
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&set_out, sizeof(set_out));
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if (ret || set_out.gpio != 0) {
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dev_err(gc->parent, "Failed to set GPIO %u to output (%d %x)\n",
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off, ret, set_out.gpio);
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return ret ? ret : -EIO;
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}
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return 0;
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}
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static int rpi_exp_gpio_get_direction(struct gpio_chip *gc, unsigned int off)
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{
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struct rpi_exp_gpio *gpio;
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struct gpio_get_config get;
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int ret;
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gpio = gpiochip_get_data(gc);
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get.gpio = off + RPI_EXP_GPIO_BASE; /* GPIO to update */
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ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG,
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&get, sizeof(get));
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if (ret || get.gpio != 0) {
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dev_err(gc->parent,
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"Failed to get GPIO %u config (%d %x)\n", off, ret,
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get.gpio);
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return ret ? ret : -EIO;
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}
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if (get.direction)
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return GPIO_LINE_DIRECTION_OUT;
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return GPIO_LINE_DIRECTION_IN;
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}
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static int rpi_exp_gpio_get(struct gpio_chip *gc, unsigned int off)
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{
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struct rpi_exp_gpio *gpio;
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struct gpio_get_set_state get;
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int ret;
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gpio = gpiochip_get_data(gc);
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get.gpio = off + RPI_EXP_GPIO_BASE; /* GPIO to update */
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get.state = 0; /* storage for returned value */
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ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_STATE,
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&get, sizeof(get));
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if (ret || get.gpio != 0) {
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dev_err(gc->parent,
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"Failed to get GPIO %u state (%d %x)\n", off, ret,
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get.gpio);
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return ret ? ret : -EIO;
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}
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return !!get.state;
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}
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static void rpi_exp_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
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{
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struct rpi_exp_gpio *gpio;
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struct gpio_get_set_state set;
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int ret;
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gpio = gpiochip_get_data(gc);
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set.gpio = off + RPI_EXP_GPIO_BASE; /* GPIO to update */
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set.state = val; /* Output state */
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ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_STATE,
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&set, sizeof(set));
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if (ret || set.gpio != 0)
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dev_err(gc->parent,
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"Failed to set GPIO %u state (%d %x)\n", off, ret,
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set.gpio);
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}
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static int rpi_exp_gpio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct device_node *fw_node;
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struct rpi_firmware *fw;
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struct rpi_exp_gpio *rpi_gpio;
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fw_node = of_get_parent(np);
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if (!fw_node) {
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dev_err(dev, "Missing firmware node\n");
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return -ENOENT;
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}
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fw = devm_rpi_firmware_get(&pdev->dev, fw_node);
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of_node_put(fw_node);
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if (!fw)
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return -EPROBE_DEFER;
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rpi_gpio = devm_kzalloc(dev, sizeof(*rpi_gpio), GFP_KERNEL);
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if (!rpi_gpio)
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return -ENOMEM;
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rpi_gpio->fw = fw;
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rpi_gpio->gc.parent = dev;
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rpi_gpio->gc.label = MODULE_NAME;
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rpi_gpio->gc.owner = THIS_MODULE;
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rpi_gpio->gc.base = -1;
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rpi_gpio->gc.ngpio = NUM_GPIO;
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rpi_gpio->gc.direction_input = rpi_exp_gpio_dir_in;
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rpi_gpio->gc.direction_output = rpi_exp_gpio_dir_out;
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rpi_gpio->gc.get_direction = rpi_exp_gpio_get_direction;
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rpi_gpio->gc.get = rpi_exp_gpio_get;
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rpi_gpio->gc.set = rpi_exp_gpio_set;
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rpi_gpio->gc.can_sleep = true;
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return devm_gpiochip_add_data(dev, &rpi_gpio->gc, rpi_gpio);
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}
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static const struct of_device_id rpi_exp_gpio_ids[] = {
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{ .compatible = "raspberrypi,firmware-gpio" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rpi_exp_gpio_ids);
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static struct platform_driver rpi_exp_gpio_driver = {
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.driver = {
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.name = MODULE_NAME,
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.of_match_table = of_match_ptr(rpi_exp_gpio_ids),
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},
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.probe = rpi_exp_gpio_probe,
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};
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module_platform_driver(rpi_exp_gpio_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.org>");
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MODULE_DESCRIPTION("Raspberry Pi 3 expander GPIO driver");
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MODULE_ALIAS("platform:rpi-exp-gpio");
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