1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // da9210-regulator.c - Regulator device driver for DA9210
4 // Copyright (C) 2013  Dialog Semiconductor Ltd.
5 
6 #include <linux/err.h>
7 #include <linux/i2c.h>
8 #include <linux/module.h>
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/regulator/driver.h>
12 #include <linux/regulator/machine.h>
13 #include <linux/of_device.h>
14 #include <linux/regulator/of_regulator.h>
15 #include <linux/regmap.h>
16 
17 #include "da9210-regulator.h"
18 
19 struct da9210 {
20 	struct regulator_dev *rdev;
21 	struct regmap *regmap;
22 };
23 
24 static const struct regmap_config da9210_regmap_config = {
25 	.reg_bits = 8,
26 	.val_bits = 8,
27 };
28 
29 static const struct regulator_ops da9210_buck_ops = {
30 	.enable = regulator_enable_regmap,
31 	.disable = regulator_disable_regmap,
32 	.is_enabled = regulator_is_enabled_regmap,
33 	.set_voltage_sel = regulator_set_voltage_sel_regmap,
34 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
35 	.list_voltage = regulator_list_voltage_linear,
36 	.set_current_limit = regulator_set_current_limit_regmap,
37 	.get_current_limit = regulator_get_current_limit_regmap,
38 };
39 
40 /* Default limits measured in millivolts and milliamps */
41 #define DA9210_MIN_MV		300
42 #define DA9210_MAX_MV		1570
43 #define DA9210_STEP_MV		10
44 
45 /* Current limits for buck (uA) indices corresponds with register values */
46 static const unsigned int da9210_buck_limits[] = {
47 	1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
48 	3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
49 };
50 
51 static const struct regulator_desc da9210_reg = {
52 	.name = "DA9210",
53 	.id = 0,
54 	.ops = &da9210_buck_ops,
55 	.type = REGULATOR_VOLTAGE,
56 	.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
57 	.min_uV = (DA9210_MIN_MV * 1000),
58 	.uV_step = (DA9210_STEP_MV * 1000),
59 	.vsel_reg = DA9210_REG_VBUCK_A,
60 	.vsel_mask = DA9210_VBUCK_MASK,
61 	.enable_reg = DA9210_REG_BUCK_CONT,
62 	.enable_mask = DA9210_BUCK_EN,
63 	.owner = THIS_MODULE,
64 	.curr_table = da9210_buck_limits,
65 	.n_current_limits = ARRAY_SIZE(da9210_buck_limits),
66 	.csel_reg = DA9210_REG_BUCK_ILIM,
67 	.csel_mask = DA9210_BUCK_ILIM_MASK,
68 };
69 
70 static irqreturn_t da9210_irq_handler(int irq, void *data)
71 {
72 	struct da9210 *chip = data;
73 	unsigned int val, handled = 0;
74 	int error, ret = IRQ_NONE;
75 
76 	error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
77 	if (error < 0)
78 		goto error_i2c;
79 
80 	if (val & DA9210_E_OVCURR) {
81 		regulator_notifier_call_chain(chip->rdev,
82 					      REGULATOR_EVENT_OVER_CURRENT,
83 					      NULL);
84 		handled |= DA9210_E_OVCURR;
85 	}
86 	if (val & DA9210_E_NPWRGOOD) {
87 		regulator_notifier_call_chain(chip->rdev,
88 					      REGULATOR_EVENT_UNDER_VOLTAGE,
89 					      NULL);
90 		handled |= DA9210_E_NPWRGOOD;
91 	}
92 	if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
93 		regulator_notifier_call_chain(chip->rdev,
94 					      REGULATOR_EVENT_OVER_TEMP, NULL);
95 		handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
96 	}
97 	if (val & DA9210_E_VMAX) {
98 		regulator_notifier_call_chain(chip->rdev,
99 					      REGULATOR_EVENT_REGULATION_OUT,
100 					      NULL);
101 		handled |= DA9210_E_VMAX;
102 	}
103 
104 	if (handled) {
105 		/* Clear handled events */
106 		error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
107 		if (error < 0)
108 			goto error_i2c;
109 
110 		ret = IRQ_HANDLED;
111 	}
112 
113 	return ret;
114 
115 error_i2c:
116 	dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
117 	return ret;
118 }
119 
120 /*
121  * I2C driver interface functions
122  */
123 
124 static const struct of_device_id __maybe_unused da9210_dt_ids[] = {
125 	{ .compatible = "dlg,da9210", },
126 	{ }
127 };
128 MODULE_DEVICE_TABLE(of, da9210_dt_ids);
129 
130 static int da9210_i2c_probe(struct i2c_client *i2c)
131 {
132 	struct da9210 *chip;
133 	struct device *dev = &i2c->dev;
134 	struct da9210_pdata *pdata = dev_get_platdata(dev);
135 	struct regulator_dev *rdev = NULL;
136 	struct regulator_config config = { };
137 	int error;
138 	const struct of_device_id *match;
139 
140 	if (i2c->dev.of_node && !pdata) {
141 		match = of_match_device(of_match_ptr(da9210_dt_ids),
142 						&i2c->dev);
143 		if (!match) {
144 			dev_err(&i2c->dev, "Error: No device match found\n");
145 			return -ENODEV;
146 		}
147 	}
148 
149 	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
150 	if (!chip)
151 		return -ENOMEM;
152 
153 	chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
154 	if (IS_ERR(chip->regmap)) {
155 		error = PTR_ERR(chip->regmap);
156 		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
157 			error);
158 		return error;
159 	}
160 
161 	config.dev = &i2c->dev;
162 	config.init_data = pdata ? &pdata->da9210_constraints :
163 		of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
164 	config.driver_data = chip;
165 	config.regmap = chip->regmap;
166 	config.of_node = dev->of_node;
167 
168 	/* Mask all interrupt sources to deassert interrupt line */
169 	error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
170 	if (!error)
171 		error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
172 	if (error) {
173 		dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
174 		return error;
175 	}
176 
177 	rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
178 	if (IS_ERR(rdev)) {
179 		dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
180 		return PTR_ERR(rdev);
181 	}
182 
183 	chip->rdev = rdev;
184 	if (i2c->irq) {
185 		error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
186 						  da9210_irq_handler,
187 						  IRQF_TRIGGER_LOW |
188 						  IRQF_ONESHOT | IRQF_SHARED,
189 						  "da9210", chip);
190 		if (error) {
191 			dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
192 				i2c->irq, error);
193 			return error;
194 		}
195 
196 		error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
197 					 DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
198 					 DA9210_M_TEMP_WARN |
199 					 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
200 		if (error < 0) {
201 			dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
202 				error);
203 			return error;
204 		}
205 	} else {
206 		dev_warn(&i2c->dev, "No IRQ configured\n");
207 	}
208 
209 	i2c_set_clientdata(i2c, chip);
210 
211 	return 0;
212 }
213 
214 static const struct i2c_device_id da9210_i2c_id[] = {
215 	{"da9210", 0},
216 	{},
217 };
218 
219 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
220 
221 static struct i2c_driver da9210_regulator_driver = {
222 	.driver = {
223 		.name = "da9210",
224 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
225 		.of_match_table = of_match_ptr(da9210_dt_ids),
226 	},
227 	.probe = da9210_i2c_probe,
228 	.id_table = da9210_i2c_id,
229 };
230 
231 module_i2c_driver(da9210_regulator_driver);
232 
233 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
234 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
235 MODULE_LICENSE("GPL v2");
236