1 // SPDX-License-Identifier: GPL-2.0+
15 #include <soc/bcm2835/raspberrypi-firmware.h>
17 #define MODULE_NAME "raspberrypi-exp-gpio"
38 	u32 state;  member
51 	u32 state;  member
54 static int rpi_exp_gpio_get_polarity(struct gpio_chip *gc, unsigned int off)  in rpi_exp_gpio_get_polarity()  argument
62 	get.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_get_polarity()
64 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG,  in rpi_exp_gpio_get_polarity()
67 		dev_err(gc->parent, "Failed to get GPIO %u config (%d %x)\n",  in rpi_exp_gpio_get_polarity()
68 			off, ret, get.gpio);  in rpi_exp_gpio_get_polarity()
69 		return ret ? ret : -EIO;  in rpi_exp_gpio_get_polarity()
74 static int rpi_exp_gpio_dir_in(struct gpio_chip *gc, unsigned int off)  in rpi_exp_gpio_dir_in()  argument
82 	set_in.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_dir_in()
86 	set_in.state = 0;		/* n/a as configured as an input */  in rpi_exp_gpio_dir_in()
88 	ret = rpi_exp_gpio_get_polarity(gc, off);  in rpi_exp_gpio_dir_in()
93 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG,  in rpi_exp_gpio_dir_in()
96 		dev_err(gc->parent, "Failed to set GPIO %u to input (%d %x)\n",  in rpi_exp_gpio_dir_in()
97 			off, ret, set_in.gpio);  in rpi_exp_gpio_dir_in()
98 		return ret ? ret : -EIO;  in rpi_exp_gpio_dir_in()
103 static int rpi_exp_gpio_dir_out(struct gpio_chip *gc, unsigned int off, int val)  in rpi_exp_gpio_dir_out()  argument
111 	set_out.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_dir_out()
115 	set_out.state = val;		/* Output state */  in rpi_exp_gpio_dir_out()
117 	ret = rpi_exp_gpio_get_polarity(gc, off);  in rpi_exp_gpio_dir_out()
122 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG,  in rpi_exp_gpio_dir_out()
125 		dev_err(gc->parent, "Failed to set GPIO %u to output (%d %x)\n",  in rpi_exp_gpio_dir_out()
126 			off, ret, set_out.gpio);  in rpi_exp_gpio_dir_out()
127 		return ret ? ret : -EIO;  in rpi_exp_gpio_dir_out()
132 static int rpi_exp_gpio_get_direction(struct gpio_chip *gc, unsigned int off)  in rpi_exp_gpio_get_direction()  argument
140 	get.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_get_direction()
142 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG,  in rpi_exp_gpio_get_direction()
145 		dev_err(gc->parent,  in rpi_exp_gpio_get_direction()
146 			"Failed to get GPIO %u config (%d %x)\n", off, ret,  in rpi_exp_gpio_get_direction()
148 		return ret ? ret : -EIO;  in rpi_exp_gpio_get_direction()
156 static int rpi_exp_gpio_get(struct gpio_chip *gc, unsigned int off)  in rpi_exp_gpio_get()  argument
164 	get.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_get()
165 	get.state = 0;		/* storage for returned value */  in rpi_exp_gpio_get()
167 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_STATE,  in rpi_exp_gpio_get()
170 		dev_err(gc->parent,  in rpi_exp_gpio_get()
171 			"Failed to get GPIO %u state (%d %x)\n", off, ret,  in rpi_exp_gpio_get()
173 		return ret ? ret : -EIO;  in rpi_exp_gpio_get()
175 	return !!get.state;  in rpi_exp_gpio_get()
178 static void rpi_exp_gpio_set(struct gpio_chip *gc, unsigned int off, int val)  in rpi_exp_gpio_set()  argument
186 	set.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_set()
187 	set.state = val;	/* Output state */  in rpi_exp_gpio_set()
189 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_STATE,  in rpi_exp_gpio_set()
192 		dev_err(gc->parent,  in rpi_exp_gpio_set()
193 			"Failed to set GPIO %u state (%d %x)\n", off, ret,  in rpi_exp_gpio_set()
199 	struct device *dev = &pdev->dev;  in rpi_exp_gpio_probe()
200 	struct device_node *np = dev->of_node;  in rpi_exp_gpio_probe()
208 		return -ENOENT;  in rpi_exp_gpio_probe()
211 	fw = devm_rpi_firmware_get(&pdev->dev, fw_node);  in rpi_exp_gpio_probe()
214 		return -EPROBE_DEFER;  in rpi_exp_gpio_probe()
218 		return -ENOMEM;  in rpi_exp_gpio_probe()
220 	rpi_gpio->fw = fw;  in rpi_exp_gpio_probe()
221 	rpi_gpio->gc.parent = dev;  in rpi_exp_gpio_probe()
222 	rpi_gpio->gc.label = MODULE_NAME;  in rpi_exp_gpio_probe()
223 	rpi_gpio->gc.owner = THIS_MODULE;  in rpi_exp_gpio_probe()
224 	rpi_gpio->gc.base = -1;  in rpi_exp_gpio_probe()
225 	rpi_gpio->gc.ngpio = NUM_GPIO;  in rpi_exp_gpio_probe()
227 	rpi_gpio->gc.direction_input = rpi_exp_gpio_dir_in;  in rpi_exp_gpio_probe()
228 	rpi_gpio->gc.direction_output = rpi_exp_gpio_dir_out;  in rpi_exp_gpio_probe()
229 	rpi_gpio->gc.get_direction = rpi_exp_gpio_get_direction;  in rpi_exp_gpio_probe()
230 	rpi_gpio->gc.get = rpi_exp_gpio_get;  in rpi_exp_gpio_probe()
231 	rpi_gpio->gc.set = rpi_exp_gpio_set;  in rpi_exp_gpio_probe()
232 	rpi_gpio->gc.can_sleep = true;  in rpi_exp_gpio_probe()
234 	return devm_gpiochip_add_data(dev, &rpi_gpio->gc, rpi_gpio);  in rpi_exp_gpio_probe()
238 	{ .compatible = "raspberrypi,firmware-gpio" },
255 MODULE_ALIAS("platform:rpi-exp-gpio");