virtio-mem: don't read big block size in Sub Block Mode
[linux-2.6-microblaze.git] / drivers / regulator / da9210-regulator.c
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
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
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");