1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * gpio-regulator.c
14  * Roger Quadros <ext-roger.quadros@nokia.com>
17  * non-controllable regulators, as well as for allowing testing on
28 #include <linux/regulator/gpio-regulator.h>
39 	struct gpio_regulator_state *states;  member
50 	for (ptr = 0; ptr < data->nr_states; ptr++)  in gpio_regulator_get_value()
51 		if (data->states[ptr].gpios == data->state)  in gpio_regulator_get_value()
52 			return data->states[ptr].value;  in gpio_regulator_get_value()
54 	return -EINVAL;  in gpio_regulator_get_value()
64 	for (ptr = 0; ptr < data->nr_states; ptr++)  in gpio_regulator_set_voltage()
65 		if (data->states[ptr].value < best_val &&  in gpio_regulator_set_voltage()
66 		    data->states[ptr].value >= min_uV &&  in gpio_regulator_set_voltage()
67 		    data->states[ptr].value <= max_uV) {  in gpio_regulator_set_voltage()
68 			target = data->states[ptr].gpios;  in gpio_regulator_set_voltage()
69 			best_val = data->states[ptr].value;  in gpio_regulator_set_voltage()
75 		return -EINVAL;  in gpio_regulator_set_voltage()
77 	for (ptr = 0; ptr < data->nr_gpios; ptr++) {  in gpio_regulator_set_voltage()
79 		gpiod_set_value_cansleep(data->gpiods[ptr], state);  in gpio_regulator_set_voltage()
81 	data->state = target;  in gpio_regulator_set_voltage()
91 	if (selector >= data->nr_states)  in gpio_regulator_list_voltage()
92 		return -EINVAL;  in gpio_regulator_list_voltage()
94 	return data->states[selector].value;  in gpio_regulator_list_voltage()
103 	for (ptr = 0; ptr < data->nr_states; ptr++)  in gpio_regulator_set_current_limit()
104 		if (data->states[ptr].value > best_val &&  in gpio_regulator_set_current_limit()
105 		    data->states[ptr].value >= min_uA &&  in gpio_regulator_set_current_limit()
106 		    data->states[ptr].value <= max_uA) {  in gpio_regulator_set_current_limit()
107 			target = data->states[ptr].gpios;  in gpio_regulator_set_current_limit()
108 			best_val = data->states[ptr].value;  in gpio_regulator_set_current_limit()
112 		return -EINVAL;  in gpio_regulator_set_current_limit()
114 	for (ptr = 0; ptr < data->nr_gpios; ptr++) {  in gpio_regulator_set_current_limit()
116 		gpiod_set_value_cansleep(data->gpiods[ptr], state);  in gpio_regulator_set_current_limit()
118 	data->state = target;  in gpio_regulator_set_current_limit()
143 		return ERR_PTR(-ENOMEM);  in of_get_gpio_regulator_config()
145 	config->init_data = of_get_regulator_init_data(dev, np, desc);  in of_get_gpio_regulator_config()
146 	if (!config->init_data)  in of_get_gpio_regulator_config()
147 		return ERR_PTR(-EINVAL);  in of_get_gpio_regulator_config()
149 	config->supply_name = config->init_data->constraints.name;  in of_get_gpio_regulator_config()
151 	if (config->init_data->constraints.boot_on)  in of_get_gpio_regulator_config()
152 		config->enabled_at_boot = true;  in of_get_gpio_regulator_config()
158 	if (of_property_read_bool(np, "enable-at-boot"))  in of_get_gpio_regulator_config()
159 		config->enabled_at_boot = true;  in of_get_gpio_regulator_config()
161 	of_property_read_u32(np, "startup-delay-us", &config->startup_delay);  in of_get_gpio_regulator_config()
166 		config->gflags = devm_kzalloc(dev,  in of_get_gpio_regulator_config()
170 		if (!config->gflags)  in of_get_gpio_regulator_config()
171 			return ERR_PTR(-ENOMEM);  in of_get_gpio_regulator_config()
176 			ret = of_property_read_u32_index(np, "gpios-states", i,  in of_get_gpio_regulator_config()
181 				config->gflags[i] = GPIOD_OUT_HIGH;  in of_get_gpio_regulator_config()
183 				config->gflags[i] =  in of_get_gpio_regulator_config()
187 	config->ngpios = ngpios;  in of_get_gpio_regulator_config()
189 	/* Fetch states. */  in of_get_gpio_regulator_config()
190 	proplen = of_property_count_u32_elems(np, "states");  in of_get_gpio_regulator_config()
192 		dev_err(dev, "No 'states' property found\n");  in of_get_gpio_regulator_config()
193 		return ERR_PTR(-EINVAL);  in of_get_gpio_regulator_config()
196 	config->states = devm_kcalloc(dev,  in of_get_gpio_regulator_config()
200 	if (!config->states)  in of_get_gpio_regulator_config()
201 		return ERR_PTR(-ENOMEM);  in of_get_gpio_regulator_config()
204 		of_property_read_u32_index(np, "states", i * 2,  in of_get_gpio_regulator_config()
205 					   &config->states[i].value);  in of_get_gpio_regulator_config()
206 		of_property_read_u32_index(np, "states", i * 2 + 1,  in of_get_gpio_regulator_config()
207 					   &config->states[i].gpios);  in of_get_gpio_regulator_config()
209 	config->nr_states = i;  in of_get_gpio_regulator_config()
211 	config->type = REGULATOR_VOLTAGE;  in of_get_gpio_regulator_config()
212 	ret = of_property_read_string(np, "regulator-type", &regtype);  in of_get_gpio_regulator_config()
215 			config->type = REGULATOR_VOLTAGE;  in of_get_gpio_regulator_config()
217 			config->type = REGULATOR_CURRENT;  in of_get_gpio_regulator_config()
219 			dev_warn(dev, "Unknown regulator-type '%s'\n",  in of_get_gpio_regulator_config()
233 	struct device *dev = &pdev->dev;  in gpio_regulator_probe()
235 	struct device_node *np = dev->of_node;  in gpio_regulator_probe()
245 		return -ENOMEM;  in gpio_regulator_probe()
249 						      &drvdata->desc);  in gpio_regulator_probe()
254 	drvdata->desc.name = devm_kstrdup(dev, config->supply_name, GFP_KERNEL);  in gpio_regulator_probe()
255 	if (drvdata->desc.name == NULL) {  in gpio_regulator_probe()
257 		return -ENOMEM;  in gpio_regulator_probe()
260 	drvdata->gpiods = devm_kzalloc(dev, sizeof(struct gpio_desc *),  in gpio_regulator_probe()
262 	if (!drvdata->gpiods)  in gpio_regulator_probe()
263 		return -ENOMEM;  in gpio_regulator_probe()
264 	for (i = 0; i < config->ngpios; i++) {  in gpio_regulator_probe()
265 		drvdata->gpiods[i] = devm_gpiod_get_index(dev,  in gpio_regulator_probe()
268 							  config->gflags[i]);  in gpio_regulator_probe()
269 		if (IS_ERR(drvdata->gpiods[i]))  in gpio_regulator_probe()
270 			return PTR_ERR(drvdata->gpiods[i]);  in gpio_regulator_probe()
272 		gpiod_set_consumer_name(drvdata->gpiods[i], drvdata->desc.name);  in gpio_regulator_probe()
274 	drvdata->nr_gpios = config->ngpios;  in gpio_regulator_probe()
276 	drvdata->states = devm_kmemdup(dev,  in gpio_regulator_probe()
277 				       config->states,  in gpio_regulator_probe()
278 				       config->nr_states *  in gpio_regulator_probe()
281 	if (drvdata->states == NULL) {  in gpio_regulator_probe()
283 		return -ENOMEM;  in gpio_regulator_probe()
285 	drvdata->nr_states = config->nr_states;  in gpio_regulator_probe()
287 	drvdata->desc.owner = THIS_MODULE;  in gpio_regulator_probe()
288 	drvdata->desc.enable_time = config->startup_delay;  in gpio_regulator_probe()
291 	switch (config->type) {  in gpio_regulator_probe()
293 		drvdata->desc.type = REGULATOR_VOLTAGE;  in gpio_regulator_probe()
294 		drvdata->desc.ops = &gpio_regulator_voltage_ops;  in gpio_regulator_probe()
295 		drvdata->desc.n_voltages = config->nr_states;  in gpio_regulator_probe()
298 		drvdata->desc.type = REGULATOR_CURRENT;  in gpio_regulator_probe()
299 		drvdata->desc.ops = &gpio_regulator_current_ops;  in gpio_regulator_probe()
303 		return -EINVAL;  in gpio_regulator_probe()
308 	for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) {  in gpio_regulator_probe()
309 		if (config->gflags[ptr] == GPIOD_OUT_HIGH)  in gpio_regulator_probe()
312 	drvdata->state = state;  in gpio_regulator_probe()
315 	cfg.init_data = config->init_data;  in gpio_regulator_probe()
323 	if (config->enabled_at_boot)  in gpio_regulator_probe()
332 	rdev = devm_regulator_register(dev, &drvdata->desc, &cfg);  in gpio_regulator_probe()
346 	{ .compatible = "regulator-gpio", },
355 		.name		= "gpio-regulator",
375 MODULE_ALIAS("platform:gpio-regulator");