1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * max1586.c  --  Voltage and current regulation for the Maxim 1586
11 #include <linux/regulator/driver.h>
13 #include <linux/regulator/max1586.h>
15 #include <linux/regulator/of_regulator.h>
41  * V6 voltage
43  *   set V6 to either 0V, 1.8V, 2.5V, 3V depending on (x & 0x3)
44  * As regulator framework doesn't accept voltages to be 0V, we use 1uV.
60 	return max1586->v3_curr_sel;  in max1586_v3_get_voltage_sel()
67 	struct i2c_client *client = max1586->client;  in max1586_v3_set_voltage_sel()
71 	dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",  in max1586_v3_set_voltage_sel()
79 	max1586->v3_curr_sel = selector;  in max1586_v3_set_voltage_sel()
88 	return max1586->v6_curr_sel;  in max1586_v6_get_voltage_sel()
95 	struct i2c_client *client = max1586->client;  in max1586_v6_set_voltage_sel()
99 	dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",  in max1586_v6_set_voltage_sel()
100 		rdev->desc->volt_table[selector] / 1000);  in max1586_v6_set_voltage_sel()
107 	max1586->v6_curr_sel = selector;  in max1586_v6_set_voltage_sel()
113  * The Maxim 1586 controls V3 and V6 voltages, but offers no way of reading back
154 	struct device_node *np = dev->of_node;  in of_get_max1586_platform_data()
157 	if (of_property_read_u32(np, "v3-gain",  in of_get_max1586_platform_data()
158 				 &pdata->v3_gain) < 0) {  in of_get_max1586_platform_data()
159 		dev_err(dev, "%pOF has no 'v3-gain' property\n", np);  in of_get_max1586_platform_data()
160 		return -EINVAL;  in of_get_max1586_platform_data()
166 		return -EINVAL;  in of_get_max1586_platform_data()
184 	pdata->subdevs = devm_kcalloc(dev,  in of_get_max1586_platform_data()
188 	if (!pdata->subdevs)  in of_get_max1586_platform_data()
189 		return -ENOMEM;  in of_get_max1586_platform_data()
191 	pdata->num_subdevs = matched;  in of_get_max1586_platform_data()
192 	sub = pdata->subdevs;  in of_get_max1586_platform_data()
195 		sub->id = i;  in of_get_max1586_platform_data()
196 		sub->name = rmatch[i].of_node->name;  in of_get_max1586_platform_data()
197 		sub->platform_data = rmatch[i].init_data;  in of_get_max1586_platform_data()
217 	pdata = dev_get_platdata(&client->dev);  in max1586_pmic_probe()
218 	if (client->dev.of_node && !pdata) {  in max1586_pmic_probe()
219 		ret = of_get_max1586_platform_data(&client->dev, &pdata_of);  in max1586_pmic_probe()
225 	max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data),  in max1586_pmic_probe()
228 		return -ENOMEM;  in max1586_pmic_probe()
230 	max1586->client = client;  in max1586_pmic_probe()
232 	if (!pdata->v3_gain)  in max1586_pmic_probe()
233 		return -EINVAL;  in max1586_pmic_probe()
235 	max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;  in max1586_pmic_probe()
236 	max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;  in max1586_pmic_probe()
238 	/* Set curr_sel to default voltage on power-up */  in max1586_pmic_probe()
239 	max1586->v3_curr_sel = 24; /* 1.3V */  in max1586_pmic_probe()
240 	max1586->v6_curr_sel = 0;  in max1586_pmic_probe()
242 	for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {  in max1586_pmic_probe()
245 		id = pdata->subdevs[i].id;  in max1586_pmic_probe()
246 		if (!pdata->subdevs[i].platform_data)  in max1586_pmic_probe()
249 			dev_err(&client->dev, "invalid regulator id %d\n", id);  in max1586_pmic_probe()
250 			return -EINVAL;  in max1586_pmic_probe()
254 			max1586_reg[id].min_uV = max1586->min_uV;  in max1586_pmic_probe()
256 					(max1586->max_uV - max1586->min_uV) /  in max1586_pmic_probe()
260 		config.dev = &client->dev;  in max1586_pmic_probe()
261 		config.init_data = pdata->subdevs[i].platform_data;  in max1586_pmic_probe()
264 		rdev = devm_regulator_register(&client->dev,  in max1586_pmic_probe()
267 			dev_err(&client->dev, "failed to register %s\n",  in max1586_pmic_probe()
274 	dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");  in max1586_pmic_probe()
307 MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");