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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// 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 const struct i2c_device_id *id)
136{
137 struct da9210 *chip;
138 struct device *dev = &i2c->dev;
139 struct da9210_pdata *pdata = dev_get_platdata(dev);
140 struct regulator_dev *rdev = NULL;
141 struct regulator_config config = { };
142 int error;
143 const struct of_device_id *match;
144
145 if (i2c->dev.of_node && !pdata) {
146 match = of_match_device(of_match_ptr(da9210_dt_ids),
147 &i2c->dev);
148 if (!match) {
149 dev_err(&i2c->dev, "Error: No device match found\n");
150 return -ENODEV;
151 }
152 }
153
154 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
155 if (!chip)
156 return -ENOMEM;
157
158 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
159 if (IS_ERR(chip->regmap)) {
160 error = PTR_ERR(chip->regmap);
161 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
162 error);
163 return error;
164 }
165
166 config.dev = &i2c->dev;
167 config.init_data = pdata ? &pdata->da9210_constraints :
168 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
169 config.driver_data = chip;
170 config.regmap = chip->regmap;
171 config.of_node = dev->of_node;
172
173 /* Mask all interrupt sources to deassert interrupt line */
174 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
175 if (!error)
176 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
177 if (error) {
178 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
179 return error;
180 }
181
182 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
183 if (IS_ERR(rdev)) {
184 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
185 return PTR_ERR(rdev);
186 }
187
188 chip->rdev = rdev;
189 if (i2c->irq) {
190 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
191 da9210_irq_handler,
192 IRQF_TRIGGER_LOW |
193 IRQF_ONESHOT | IRQF_SHARED,
194 "da9210", chip);
195 if (error) {
196 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
197 i2c->irq, error);
198 return error;
199 }
200
201 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
202 DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
203 DA9210_M_TEMP_WARN |
204 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
205 if (error < 0) {
206 dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
207 error);
208 return error;
209 }
210 } else {
211 dev_warn(&i2c->dev, "No IRQ configured\n");
212 }
213
214 i2c_set_clientdata(i2c, chip);
215
216 return 0;
217}
218
219static const struct i2c_device_id da9210_i2c_id[] = {
220 {"da9210", 0},
221 {},
222};
223
224MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
225
226static struct i2c_driver da9210_regulator_driver = {
227 .driver = {
228 .name = "da9210",
229 .of_match_table = of_match_ptr(da9210_dt_ids),
230 },
231 .probe = da9210_i2c_probe,
232 .id_table = da9210_i2c_id,
233};
234
235module_i2c_driver(da9210_regulator_driver);
236
237MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
238MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
239MODULE_LICENSE("GPL v2");