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
19 struct da9210 {
20 struct regulator_dev *rdev;
21 struct regmap *regmap;
22 };
23
24 static const struct regmap_config da9210_regmap_config = {
25 .reg_bits = 8,
26 .val_bits = 8,
27 };
28
29 static 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 */
46 static 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
51 static 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
da9210_irq_handler(int irq,void * data)70 static 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
115 error_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
124 static const struct of_device_id __maybe_unused da9210_dt_ids[] = {
125 { .compatible = "dlg,da9210", },
126 { }
127 };
128 MODULE_DEVICE_TABLE(of, da9210_dt_ids);
129
da9210_i2c_probe(struct i2c_client * i2c)130 static 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
214 static const struct i2c_device_id da9210_i2c_id[] = {
215 {"da9210", 0},
216 {},
217 };
218
219 MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
220
221 static struct i2c_driver da9210_regulator_driver = {
222 .driver = {
223 .name = "da9210",
224 .of_match_table = of_match_ptr(da9210_dt_ids),
225 },
226 .probe_new = da9210_i2c_probe,
227 .id_table = da9210_i2c_id,
228 };
229
230 module_i2c_driver(da9210_regulator_driver);
231
232 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
233 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
234 MODULE_LICENSE("GPL v2");
235