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
19struct da9210 {
20	struct regulator_dev *rdev;
21	struct regmap *regmap;
22};
23
24static const struct regmap_config da9210_regmap_config = {
25	.reg_bits = 8,
26	.val_bits = 8,
27};
28
29static 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 */
46static 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
51static 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
70static 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
115error_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
124static const struct of_device_id __maybe_unused da9210_dt_ids[] = {
125	{ .compatible = "dlg,da9210", },
126	{ }
127};
128MODULE_DEVICE_TABLE(of, da9210_dt_ids);
129
130static 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
214static const struct i2c_device_id da9210_i2c_id[] = {
215	{"da9210", 0},
216	{},
217};
218
219MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
220
221static 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
231module_i2c_driver(da9210_regulator_driver);
232
233MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
234MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
235MODULE_LICENSE("GPL v2");
236