tjh.dev
Linux kernel mirror (for testing)
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linux
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 regulator_lock(chip->rdev);
81
82 if (val & DA9210_E_OVCURR) {
83 regulator_notifier_call_chain(chip->rdev,
84 REGULATOR_EVENT_OVER_CURRENT,
85 NULL);
86 handled |= DA9210_E_OVCURR;
87 }
88 if (val & DA9210_E_NPWRGOOD) {
89 regulator_notifier_call_chain(chip->rdev,
90 REGULATOR_EVENT_UNDER_VOLTAGE,
91 NULL);
92 handled |= DA9210_E_NPWRGOOD;
93 }
94 if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
95 regulator_notifier_call_chain(chip->rdev,
96 REGULATOR_EVENT_OVER_TEMP, NULL);
97 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
98 }
99 if (val & DA9210_E_VMAX) {
100 regulator_notifier_call_chain(chip->rdev,
101 REGULATOR_EVENT_REGULATION_OUT,
102 NULL);
103 handled |= DA9210_E_VMAX;
104 }
105
106 regulator_unlock(chip->rdev);
107
108 if (handled) {
109 /* Clear handled events */
110 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
111 if (error < 0)
112 goto error_i2c;
113
114 ret = IRQ_HANDLED;
115 }
116
117 return ret;
118
119error_i2c:
120 dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
121 return ret;
122}
123
124/*
125 * I2C driver interface functions
126 */
127
128static const struct of_device_id da9210_dt_ids[] = {
129 { .compatible = "dlg,da9210", },
130 { }
131};
132MODULE_DEVICE_TABLE(of, da9210_dt_ids);
133
134static int da9210_i2c_probe(struct i2c_client *i2c)
135{
136 struct da9210 *chip;
137 struct device *dev = &i2c->dev;
138 struct da9210_pdata *pdata = dev_get_platdata(dev);
139 struct regulator_dev *rdev = NULL;
140 struct regulator_config config = { };
141 int error;
142 const struct of_device_id *match;
143
144 if (i2c->dev.of_node && !pdata) {
145 match = of_match_device(of_match_ptr(da9210_dt_ids),
146 &i2c->dev);
147 if (!match) {
148 dev_err(&i2c->dev, "Error: No device match found\n");
149 return -ENODEV;
150 }
151 }
152
153 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
154 if (!chip)
155 return -ENOMEM;
156
157 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
158 if (IS_ERR(chip->regmap)) {
159 error = PTR_ERR(chip->regmap);
160 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
161 error);
162 return error;
163 }
164
165 config.dev = &i2c->dev;
166 config.init_data = pdata ? &pdata->da9210_constraints :
167 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
168 config.driver_data = chip;
169 config.regmap = chip->regmap;
170 config.of_node = dev->of_node;
171
172 /* Mask all interrupt sources to deassert interrupt line */
173 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
174 if (!error)
175 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
176 if (error) {
177 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
178 return error;
179 }
180
181 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
182 if (IS_ERR(rdev)) {
183 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
184 return PTR_ERR(rdev);
185 }
186
187 chip->rdev = rdev;
188 if (i2c->irq) {
189 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
190 da9210_irq_handler,
191 IRQF_TRIGGER_LOW |
192 IRQF_ONESHOT | IRQF_SHARED,
193 "da9210", chip);
194 if (error) {
195 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
196 i2c->irq, error);
197 return error;
198 }
199
200 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
201 DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
202 DA9210_M_TEMP_WARN |
203 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
204 if (error < 0) {
205 dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
206 error);
207 return error;
208 }
209 } else {
210 dev_warn(&i2c->dev, "No IRQ configured\n");
211 }
212
213 i2c_set_clientdata(i2c, chip);
214
215 return 0;
216}
217
218static const struct i2c_device_id da9210_i2c_id[] = {
219 {"da9210", 0},
220 {},
221};
222
223MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
224
225static struct i2c_driver da9210_regulator_driver = {
226 .driver = {
227 .name = "da9210",
228 .of_match_table = of_match_ptr(da9210_dt_ids),
229 },
230 .probe_new = da9210_i2c_probe,
231 .id_table = da9210_i2c_id,
232};
233
234module_i2c_driver(da9210_regulator_driver);
235
236MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
237MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
238MODULE_LICENSE("GPL v2");