1 // SPDX-License-Identifier: GPL-2.0+
3  *  Raspberry Pi 3 expander GPIO driver
5  *  Uses the firmware mailbox service to communicate with the
6  *  GPIO expander on the VPU.
12 #include <linux/gpio/driver.h>
15 #include <soc/bcm2835/raspberrypi-firmware.h>
17 #define MODULE_NAME "raspberrypi-exp-gpio"
30 /* VC4 firmware mailbox interface data structures */
33 	u32 gpio;  member
42 	u32 gpio;  member
50 	u32 gpio;  member
56 	struct rpi_exp_gpio *gpio;  in rpi_exp_gpio_get_polarity()  local
60 	gpio = gpiochip_get_data(gc);  in rpi_exp_gpio_get_polarity()
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()
66 	if (ret || get.gpio != 0) {  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()
76 	struct rpi_exp_gpio *gpio;  in rpi_exp_gpio_dir_in()  local
80 	gpio = gpiochip_get_data(gc);  in rpi_exp_gpio_dir_in()
82 	set_in.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_dir_in()
93 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG,  in rpi_exp_gpio_dir_in()
95 	if (ret || set_in.gpio != 0) {  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()
105 	struct rpi_exp_gpio *gpio;  in rpi_exp_gpio_dir_out()  local
109 	gpio = gpiochip_get_data(gc);  in rpi_exp_gpio_dir_out()
111 	set_out.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_dir_out()
122 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_CONFIG,  in rpi_exp_gpio_dir_out()
124 	if (ret || set_out.gpio != 0) {  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()
134 	struct rpi_exp_gpio *gpio;  in rpi_exp_gpio_get_direction()  local
138 	gpio = gpiochip_get_data(gc);  in rpi_exp_gpio_get_direction()
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()
144 	if (ret || get.gpio != 0) {  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()
147 			get.gpio);  in rpi_exp_gpio_get_direction()
148 		return ret ? ret : -EIO;  in rpi_exp_gpio_get_direction()
158 	struct rpi_exp_gpio *gpio;  in rpi_exp_gpio_get()  local
162 	gpio = gpiochip_get_data(gc);  in rpi_exp_gpio_get()
164 	get.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_get()
167 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_STATE,  in rpi_exp_gpio_get()
169 	if (ret || get.gpio != 0) {  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()
172 			get.gpio);  in rpi_exp_gpio_get()
173 		return ret ? ret : -EIO;  in rpi_exp_gpio_get()
180 	struct rpi_exp_gpio *gpio;  in rpi_exp_gpio_set()  local
184 	gpio = gpiochip_get_data(gc);  in rpi_exp_gpio_set()
186 	set.gpio = off + RPI_EXP_GPIO_BASE;	/* GPIO to update */  in rpi_exp_gpio_set()
189 	ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_STATE,  in rpi_exp_gpio_set()
191 	if (ret || set.gpio != 0)  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()
194 			set.gpio);  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()
207 		dev_err(dev, "Missing firmware node\n");  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" },
254 MODULE_DESCRIPTION("Raspberry Pi 3 expander GPIO driver");
255 MODULE_ALIAS("platform:rpi-exp-gpio");