1 // SPDX-License-Identifier: GPL-2.0-or-later
3 // max20086-regulator.c - MAX20086-MAX20089 camera power protector driver
49 	u8 id;  member
80 	.id = (n) - 1,				\
85 	.enable_mask = 1 << ((n) - 1),		\
86 	.enable_val = 1 << ((n) - 1),		\
104 static int max20086_regulators_register(struct max20086 *chip)  in max20086_regulators_register()  argument
108 	for (i = 0; i < chip->info->num_outputs; i++) {  in max20086_regulators_register()
109 		struct max20086_regulator *reg = &chip->regulators[i];  in max20086_regulators_register()
113 		config.dev = chip->dev;  in max20086_regulators_register()
114 		config.init_data = reg->init_data;  in max20086_regulators_register()
115 		config.driver_data = chip;  in max20086_regulators_register()
116 		config.of_node = reg->of_node;  in max20086_regulators_register()
117 		config.regmap = chip->regmap;  in max20086_regulators_register()
118 		config.ena_gpiod = chip->ena_gpiod;  in max20086_regulators_register()
120 		rdev = devm_regulator_register(chip->dev, reg->desc, &config);  in max20086_regulators_register()
122 			dev_err(chip->dev,  in max20086_regulators_register()
124 				reg->desc->name);  in max20086_regulators_register()
128 		reg->rdev = rdev;  in max20086_regulators_register()
134 static int max20086_parse_regulators_dt(struct max20086 *chip, bool *boot_on)  in max20086_parse_regulators_dt()  argument
141 		of_get_child_by_name(chip->dev->of_node, "regulators");  in max20086_parse_regulators_dt()
143 		dev_err(chip->dev, "regulators node not found\n");  in max20086_parse_regulators_dt()
144 		return -ENODEV;  in max20086_parse_regulators_dt()
147 	matches = devm_kcalloc(chip->dev, chip->info->num_outputs,  in max20086_parse_regulators_dt()
150 		return -ENOMEM;  in max20086_parse_regulators_dt()
152 	for (i = 0; i < chip->info->num_outputs; ++i)  in max20086_parse_regulators_dt()
155 	ret = of_regulator_match(chip->dev, node, matches,  in max20086_parse_regulators_dt()
156 				 chip->info->num_outputs);  in max20086_parse_regulators_dt()
158 		dev_err(chip->dev, "Failed to match regulators\n");  in max20086_parse_regulators_dt()
159 		return -EINVAL;  in max20086_parse_regulators_dt()
164 	for (i = 0; i < chip->info->num_outputs; i++) {  in max20086_parse_regulators_dt()
165 		struct max20086_regulator *reg = &chip->regulators[i];  in max20086_parse_regulators_dt()
167 		reg->init_data = matches[i].init_data;  in max20086_parse_regulators_dt()
168 		reg->of_node = matches[i].of_node;  in max20086_parse_regulators_dt()
169 		reg->desc = &max20086_regulators[i];  in max20086_parse_regulators_dt()
171 		if (reg->init_data) {  in max20086_parse_regulators_dt()
172 			if (reg->init_data->constraints.always_on ||  in max20086_parse_regulators_dt()
173 			    reg->init_data->constraints.boot_on)  in max20086_parse_regulators_dt()
181 static int max20086_detect(struct max20086 *chip)  in max20086_detect()  argument
186 	ret = regmap_read(chip->regmap, MAX20086_REG_ID, &data);  in max20086_detect()
188 		dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);  in max20086_detect()
192 	if ((data & DEVICE_ID_MASK) != chip->info->id) {  in max20086_detect()
193 		dev_err(chip->dev, "Invalid device ID 0x%02x\n", data);  in max20086_detect()
194 		return -ENXIO;  in max20086_detect()
221 	struct max20086 *chip;  in max20086_i2c_probe()  local
226 	chip = devm_kzalloc(&i2c->dev, sizeof(*chip), GFP_KERNEL);  in max20086_i2c_probe()
227 	if (!chip)  in max20086_i2c_probe()
228 		return -ENOMEM;  in max20086_i2c_probe()
230 	chip->dev = &i2c->dev;  in max20086_i2c_probe()
231 	chip->info = i2c_get_match_data(i2c);  in max20086_i2c_probe()
233 	i2c_set_clientdata(i2c, chip);  in max20086_i2c_probe()
235 	chip->regmap = devm_regmap_init_i2c(i2c, &max20086_regmap_config);  in max20086_i2c_probe()
236 	if (IS_ERR(chip->regmap)) {  in max20086_i2c_probe()
237 		ret = PTR_ERR(chip->regmap);  in max20086_i2c_probe()
238 		dev_err(chip->dev, "Failed to allocate register map: %d\n", ret);  in max20086_i2c_probe()
242 	ret = max20086_parse_regulators_dt(chip, &boot_on);  in max20086_i2c_probe()
246 	ret = max20086_detect(chip);  in max20086_i2c_probe()
251 	ret = regmap_update_bits(chip->regmap, MAX20086_REG_MASK,  in max20086_i2c_probe()
255 		dev_err(chip->dev, "Failed to disable interrupts: %d\n", ret);  in max20086_i2c_probe()
263 	 * loader. Otherwise, request it with a low state to enter lower-power  in max20086_i2c_probe()
267 	chip->ena_gpiod = devm_gpiod_get_optional(chip->dev, "enable", flags);  in max20086_i2c_probe()
268 	if (IS_ERR(chip->ena_gpiod)) {  in max20086_i2c_probe()
269 		ret = PTR_ERR(chip->ena_gpiod);  in max20086_i2c_probe()
270 		dev_err(chip->dev, "Failed to get enable GPIO: %d\n", ret);  in max20086_i2c_probe()
274 	ret = max20086_regulators_register(chip);  in max20086_i2c_probe()
276 		dev_err(chip->dev, "Failed to register regulators: %d\n", ret);  in max20086_i2c_probe()
284 	.id = MAX20086_DEVICE_ID_MAX20086,
289 	.id = MAX20086_DEVICE_ID_MAX20087,
294 	.id = MAX20086_DEVICE_ID_MAX20088,
299 	.id = MAX20086_DEVICE_ID_MAX20089,
334 MODULE_DESCRIPTION("MAX20086-MAX20089 Camera Power Protector Driver");