1 // SPDX-License-Identifier: GPL-2.0-only
5  * This driver provides the ability to control GPIOs on the Chrome OS EC.
23 /* Prefix all names to avoid collisions with EC <-> AP nets */
24 static const char cros_ec_gpio_prefix[] = "EC:";
29 	const char *name = gc->names[gpio] + strlen(cros_ec_gpio_prefix);  in cros_ec_gpio_set()
44 		dev_err(gc->parent, "error setting gpio%d (%s) on EC: %d\n", gpio, name, ret);  in cros_ec_gpio_set()
49 	const char *name = gc->names[gpio] + strlen(cros_ec_gpio_prefix);  in cros_ec_gpio_get()
58 		return -EINVAL;  in cros_ec_gpio_get()
63 		dev_err(gc->parent, "error getting gpio%d (%s) on EC: %d\n", gpio, name, ret);  in cros_ec_gpio_get()
75 	const char *name = gc->names[gpio] + strlen(cros_ec_gpio_prefix);  in cros_ec_gpio_get_direction()
87 		dev_err(gc->parent, "error getting direction of gpio%d (%s) on EC: %d\n", gpio, name, ret);  in cros_ec_gpio_get_direction()
97 	return -EINVAL;  in cros_ec_gpio_get_direction()
100 /* Query EC for all gpio line names */
108 	/* EC may not NUL terminate */  in cros_ec_gpio_init_names()
114 	names = devm_kcalloc(gc->parent, gc->ngpio, sizeof(*names), GFP_KERNEL);  in cros_ec_gpio_init_names()
116 		return -ENOMEM;  in cros_ec_gpio_init_names()
117 	gc->names = names;  in cros_ec_gpio_init_names()
119 	str = devm_kcalloc(gc->parent, gc->ngpio, name_len, GFP_KERNEL);  in cros_ec_gpio_init_names()
121 		return -ENOMEM;  in cros_ec_gpio_init_names()
124 	for (i = 0; i < gc->ngpio; i++) {  in cros_ec_gpio_init_names()
129 			dev_err_probe(gc->parent, ret, "error getting gpio%d info\n", i);  in cros_ec_gpio_init_names()
145 /* Query EC for number of gpios */
164 	struct device *dev = &pdev->dev;  in cros_ec_gpio_probe()
165 	struct device *parent = dev->parent;  in cros_ec_gpio_probe()
167 	struct cros_ec_device *cros_ec = ec_dev->ec_dev;  in cros_ec_gpio_probe()
172 	/* Use the fwnode from the protocol device, e.g. cros-ec-spi */  in cros_ec_gpio_probe()
173 	device_set_node(dev, dev_fwnode(cros_ec->dev));  in cros_ec_gpio_probe()
183 		return -ENOMEM;  in cros_ec_gpio_probe()
185 	gc->ngpio = ngpios;  in cros_ec_gpio_probe()
186 	gc->parent = dev;  in cros_ec_gpio_probe()
191 	gc->can_sleep = true;  in cros_ec_gpio_probe()
192 	gc->label = dev_name(dev);  in cros_ec_gpio_probe()
193 	gc->base = -1;  in cros_ec_gpio_probe()
194 	gc->set = cros_ec_gpio_set;  in cros_ec_gpio_probe()
195 	gc->get = cros_ec_gpio_get;  in cros_ec_gpio_probe()
196 	gc->get_direction = cros_ec_gpio_get_direction;  in cros_ec_gpio_probe()
202 	{ "cros-ec-gpio", 0 },
210 		.name = "cros-ec-gpio",
216 MODULE_DESCRIPTION("ChromeOS EC GPIO Driver");