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.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
139	chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
140	if (!chip)
141		return -ENOMEM;
142
143	chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
144	if (IS_ERR(chip->regmap)) {
145		error = PTR_ERR(chip->regmap);
146		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
147			error);
148		return error;
149	}
150
151	config.dev = &i2c->dev;
152	config.init_data = pdata ? &pdata->da9210_constraints :
153		of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
154	config.driver_data = chip;
155	config.regmap = chip->regmap;
156	config.of_node = dev->of_node;
157
158	/* Mask all interrupt sources to deassert interrupt line */
159	error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
160	if (!error)
161		error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
162	if (error) {
163		dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
164		return error;
165	}
166
167	rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
168	if (IS_ERR(rdev)) {
169		dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
170		return PTR_ERR(rdev);
171	}
172
173	chip->rdev = rdev;
174	if (i2c->irq) {
175		error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
176						  da9210_irq_handler,
177						  IRQF_TRIGGER_LOW |
178						  IRQF_ONESHOT | IRQF_SHARED,
179						  "da9210", chip);
180		if (error) {
181			dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
182				i2c->irq, error);
183			return error;
184		}
185
186		error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
187					 DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
188					 DA9210_M_TEMP_WARN |
189					 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
190		if (error < 0) {
191			dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
192				error);
193			return error;
194		}
195	} else {
196		dev_warn(&i2c->dev, "No IRQ configured\n");
197	}
198
199	i2c_set_clientdata(i2c, chip);
200
201	return 0;
202}
203
204static const struct i2c_device_id da9210_i2c_id[] = {
205	{"da9210", 0},
206	{},
207};
208
209MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
210
211static struct i2c_driver da9210_regulator_driver = {
212	.driver = {
213		.name = "da9210",
214		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
215		.of_match_table = of_match_ptr(da9210_dt_ids),
216	},
217	.probe = da9210_i2c_probe,
218	.id_table = da9210_i2c_id,
219};
220
221module_i2c_driver(da9210_regulator_driver);
222
223MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
224MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
225MODULE_LICENSE("GPL v2");