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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" },
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");
1/*
2 * da9210-regulator.c - Regulator device driver for DA9210
3 * Copyright (C) 2013 Dialog Semiconductor Ltd.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21#include <linux/err.h>
22#include <linux/i2c.h>
23#include <linux/module.h>
24#include <linux/interrupt.h>
25#include <linux/irq.h>
26#include <linux/regulator/driver.h>
27#include <linux/regulator/machine.h>
28#include <linux/of_device.h>
29#include <linux/regulator/of_regulator.h>
30#include <linux/regmap.h>
31
32#include "da9210-regulator.h"
33
34struct da9210 {
35 struct regulator_dev *rdev;
36 struct regmap *regmap;
37};
38
39static const struct regmap_config da9210_regmap_config = {
40 .reg_bits = 8,
41 .val_bits = 8,
42};
43
44static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
45 int max_uA);
46static int da9210_get_current_limit(struct regulator_dev *rdev);
47
48static const struct regulator_ops da9210_buck_ops = {
49 .enable = regulator_enable_regmap,
50 .disable = regulator_disable_regmap,
51 .is_enabled = regulator_is_enabled_regmap,
52 .set_voltage_sel = regulator_set_voltage_sel_regmap,
53 .get_voltage_sel = regulator_get_voltage_sel_regmap,
54 .list_voltage = regulator_list_voltage_linear,
55 .set_current_limit = da9210_set_current_limit,
56 .get_current_limit = da9210_get_current_limit,
57};
58
59/* Default limits measured in millivolts and milliamps */
60#define DA9210_MIN_MV 300
61#define DA9210_MAX_MV 1570
62#define DA9210_STEP_MV 10
63
64/* Current limits for buck (uA) indices corresponds with register values */
65static const int da9210_buck_limits[] = {
66 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
67 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
68};
69
70static const struct regulator_desc da9210_reg = {
71 .name = "DA9210",
72 .id = 0,
73 .ops = &da9210_buck_ops,
74 .type = REGULATOR_VOLTAGE,
75 .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
76 .min_uV = (DA9210_MIN_MV * 1000),
77 .uV_step = (DA9210_STEP_MV * 1000),
78 .vsel_reg = DA9210_REG_VBUCK_A,
79 .vsel_mask = DA9210_VBUCK_MASK,
80 .enable_reg = DA9210_REG_BUCK_CONT,
81 .enable_mask = DA9210_BUCK_EN,
82 .owner = THIS_MODULE,
83};
84
85static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
86 int max_uA)
87{
88 struct da9210 *chip = rdev_get_drvdata(rdev);
89 unsigned int sel;
90 int i;
91
92 /* search for closest to maximum */
93 for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
94 if (min_uA <= da9210_buck_limits[i] &&
95 max_uA >= da9210_buck_limits[i]) {
96 sel = i;
97 sel = sel << DA9210_BUCK_ILIM_SHIFT;
98 return regmap_update_bits(chip->regmap,
99 DA9210_REG_BUCK_ILIM,
100 DA9210_BUCK_ILIM_MASK, sel);
101 }
102 }
103
104 return -EINVAL;
105}
106
107static int da9210_get_current_limit(struct regulator_dev *rdev)
108{
109 struct da9210 *chip = rdev_get_drvdata(rdev);
110 unsigned int data;
111 unsigned int sel;
112 int ret;
113
114 ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
115 if (ret < 0)
116 return ret;
117
118 /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
119 sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
120
121 return da9210_buck_limits[sel];
122}
123
124static irqreturn_t da9210_irq_handler(int irq, void *data)
125{
126 struct da9210 *chip = data;
127 unsigned int val, handled = 0;
128 int error, ret = IRQ_NONE;
129
130 error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
131 if (error < 0)
132 goto error_i2c;
133
134 mutex_lock(&chip->rdev->mutex);
135
136 if (val & DA9210_E_OVCURR) {
137 regulator_notifier_call_chain(chip->rdev,
138 REGULATOR_EVENT_OVER_CURRENT,
139 NULL);
140 handled |= DA9210_E_OVCURR;
141 }
142 if (val & DA9210_E_NPWRGOOD) {
143 regulator_notifier_call_chain(chip->rdev,
144 REGULATOR_EVENT_UNDER_VOLTAGE,
145 NULL);
146 handled |= DA9210_E_NPWRGOOD;
147 }
148 if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
149 regulator_notifier_call_chain(chip->rdev,
150 REGULATOR_EVENT_OVER_TEMP, NULL);
151 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
152 }
153 if (val & DA9210_E_VMAX) {
154 regulator_notifier_call_chain(chip->rdev,
155 REGULATOR_EVENT_REGULATION_OUT,
156 NULL);
157 handled |= DA9210_E_VMAX;
158 }
159
160 mutex_unlock(&chip->rdev->mutex);
161
162 if (handled) {
163 /* Clear handled events */
164 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
165 if (error < 0)
166 goto error_i2c;
167
168 ret = IRQ_HANDLED;
169 }
170
171 return ret;
172
173error_i2c:
174 dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
175 return ret;
176}
177
178/*
179 * I2C driver interface functions
180 */
181
182static const struct of_device_id da9210_dt_ids[] = {
183 { .compatible = "dlg,da9210", },
184 { }
185};
186MODULE_DEVICE_TABLE(of, da9210_dt_ids);
187
188static int da9210_i2c_probe(struct i2c_client *i2c,
189 const struct i2c_device_id *id)
190{
191 struct da9210 *chip;
192 struct device *dev = &i2c->dev;
193 struct da9210_pdata *pdata = dev_get_platdata(dev);
194 struct regulator_dev *rdev = NULL;
195 struct regulator_config config = { };
196 int error;
197 const struct of_device_id *match;
198
199 if (i2c->dev.of_node && !pdata) {
200 match = of_match_device(of_match_ptr(da9210_dt_ids),
201 &i2c->dev);
202 if (!match) {
203 dev_err(&i2c->dev, "Error: No device match found\n");
204 return -ENODEV;
205 }
206 }
207
208 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
209 if (!chip)
210 return -ENOMEM;
211
212 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
213 if (IS_ERR(chip->regmap)) {
214 error = PTR_ERR(chip->regmap);
215 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
216 error);
217 return error;
218 }
219
220 config.dev = &i2c->dev;
221 config.init_data = pdata ? &pdata->da9210_constraints :
222 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
223 config.driver_data = chip;
224 config.regmap = chip->regmap;
225 config.of_node = dev->of_node;
226
227 /* Mask all interrupt sources to deassert interrupt line */
228 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
229 if (!error)
230 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
231 if (error) {
232 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
233 return error;
234 }
235
236 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
237 if (IS_ERR(rdev)) {
238 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
239 return PTR_ERR(rdev);
240 }
241
242 chip->rdev = rdev;
243 if (i2c->irq) {
244 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
245 da9210_irq_handler,
246 IRQF_TRIGGER_LOW |
247 IRQF_ONESHOT | IRQF_SHARED,
248 "da9210", chip);
249 if (error) {
250 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
251 i2c->irq, error);
252 return error;
253 }
254
255 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
256 DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
257 DA9210_M_TEMP_WARN |
258 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
259 if (error < 0) {
260 dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
261 error);
262 return error;
263 }
264 } else {
265 dev_warn(&i2c->dev, "No IRQ configured\n");
266 }
267
268 i2c_set_clientdata(i2c, chip);
269
270 return 0;
271}
272
273static const struct i2c_device_id da9210_i2c_id[] = {
274 {"da9210", 0},
275 {},
276};
277
278MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
279
280static struct i2c_driver da9210_regulator_driver = {
281 .driver = {
282 .name = "da9210",
283 .of_match_table = of_match_ptr(da9210_dt_ids),
284 },
285 .probe = da9210_i2c_probe,
286 .id_table = da9210_i2c_id,
287};
288
289module_i2c_driver(da9210_regulator_driver);
290
291MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
292MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
293MODULE_LICENSE("GPL v2");