blob: b3517830edb6f0ea2139cbc5ebe902ce8cf8265d [file] [log] [blame]
Steve Twiss16f10912013-08-06 15:30:48 +01001/*
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/init.h>
Geert Uytterhoeven42457462015-06-24 14:14:21 +020025#include <linux/interrupt.h>
26#include <linux/irq.h>
Steve Twiss16f10912013-08-06 15:30:48 +010027#include <linux/slab.h>
28#include <linux/regulator/driver.h>
29#include <linux/regulator/machine.h>
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +020030#include <linux/regulator/of_regulator.h>
Steve Twiss16f10912013-08-06 15:30:48 +010031#include <linux/regmap.h>
32
33#include "da9210-regulator.h"
34
35struct da9210 {
36 struct regulator_dev *rdev;
37 struct regmap *regmap;
38};
39
40static const struct regmap_config da9210_regmap_config = {
41 .reg_bits = 8,
42 .val_bits = 8,
43};
44
45static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
46 int max_uA);
47static int da9210_get_current_limit(struct regulator_dev *rdev);
48
49static struct regulator_ops da9210_buck_ops = {
50 .enable = regulator_enable_regmap,
51 .disable = regulator_disable_regmap,
52 .is_enabled = regulator_is_enabled_regmap,
53 .set_voltage_sel = regulator_set_voltage_sel_regmap,
54 .get_voltage_sel = regulator_get_voltage_sel_regmap,
55 .list_voltage = regulator_list_voltage_linear,
56 .set_current_limit = da9210_set_current_limit,
57 .get_current_limit = da9210_get_current_limit,
58};
59
60/* Default limits measured in millivolts and milliamps */
61#define DA9210_MIN_MV 300
62#define DA9210_MAX_MV 1570
63#define DA9210_STEP_MV 10
64
65/* Current limits for buck (uA) indices corresponds with register values */
66static const int da9210_buck_limits[] = {
67 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
68 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
69};
70
71static const struct regulator_desc da9210_reg = {
72 .name = "DA9210",
73 .id = 0,
74 .ops = &da9210_buck_ops,
75 .type = REGULATOR_VOLTAGE,
76 .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
77 .min_uV = (DA9210_MIN_MV * 1000),
78 .uV_step = (DA9210_STEP_MV * 1000),
79 .vsel_reg = DA9210_REG_VBUCK_A,
80 .vsel_mask = DA9210_VBUCK_MASK,
81 .enable_reg = DA9210_REG_BUCK_CONT,
82 .enable_mask = DA9210_BUCK_EN,
83 .owner = THIS_MODULE,
84};
85
86static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
87 int max_uA)
88{
89 struct da9210 *chip = rdev_get_drvdata(rdev);
90 unsigned int sel;
91 int i;
92
93 /* search for closest to maximum */
94 for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
95 if (min_uA <= da9210_buck_limits[i] &&
96 max_uA >= da9210_buck_limits[i]) {
97 sel = i;
98 sel = sel << DA9210_BUCK_ILIM_SHIFT;
99 return regmap_update_bits(chip->regmap,
100 DA9210_REG_BUCK_ILIM,
101 DA9210_BUCK_ILIM_MASK, sel);
102 }
103 }
104
105 return -EINVAL;
106}
107
108static int da9210_get_current_limit(struct regulator_dev *rdev)
109{
110 struct da9210 *chip = rdev_get_drvdata(rdev);
111 unsigned int data;
112 unsigned int sel;
113 int ret;
114
115 ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
116 if (ret < 0)
117 return ret;
118
119 /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
120 sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
121
122 return da9210_buck_limits[sel];
123}
124
Geert Uytterhoeven42457462015-06-24 14:14:21 +0200125static irqreturn_t da9210_irq_handler(int irq, void *data)
126{
127 struct da9210 *chip = data;
128 unsigned int val, handled = 0;
129 int error, ret = IRQ_NONE;
130
131 error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
132 if (error < 0)
133 goto error_i2c;
134
135 if (val & DA9210_E_OVCURR) {
136 regulator_notifier_call_chain(chip->rdev,
137 REGULATOR_EVENT_OVER_CURRENT,
138 NULL);
139 handled |= DA9210_E_OVCURR;
140 }
141 if (val & DA9210_E_NPWRGOOD) {
142 regulator_notifier_call_chain(chip->rdev,
143 REGULATOR_EVENT_UNDER_VOLTAGE,
144 NULL);
145 handled |= DA9210_E_NPWRGOOD;
146 }
147 if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
148 regulator_notifier_call_chain(chip->rdev,
149 REGULATOR_EVENT_OVER_TEMP, NULL);
150 handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
151 }
152 if (val & DA9210_E_VMAX) {
153 regulator_notifier_call_chain(chip->rdev,
154 REGULATOR_EVENT_REGULATION_OUT,
155 NULL);
156 handled |= DA9210_E_VMAX;
157 }
158 if (handled) {
159 /* Clear handled events */
160 error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
161 if (error < 0)
162 goto error_i2c;
163
164 ret = IRQ_HANDLED;
165 }
166
167 return ret;
168
169error_i2c:
170 dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
171 return ret;
172}
173
Steve Twiss16f10912013-08-06 15:30:48 +0100174/*
175 * I2C driver interface functions
176 */
177static int da9210_i2c_probe(struct i2c_client *i2c,
178 const struct i2c_device_id *id)
179{
180 struct da9210 *chip;
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +0200181 struct device *dev = &i2c->dev;
182 struct da9210_pdata *pdata = dev_get_platdata(dev);
Steve Twiss16f10912013-08-06 15:30:48 +0100183 struct regulator_dev *rdev = NULL;
184 struct regulator_config config = { };
185 int error;
186
187 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
Sachin Kamat6c48acf2014-02-20 14:23:02 +0530188 if (!chip)
Steve Twiss16f10912013-08-06 15:30:48 +0100189 return -ENOMEM;
Steve Twiss16f10912013-08-06 15:30:48 +0100190
191 chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
192 if (IS_ERR(chip->regmap)) {
193 error = PTR_ERR(chip->regmap);
194 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
195 error);
196 return error;
197 }
198
199 config.dev = &i2c->dev;
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +0200200 config.init_data = pdata ? &pdata->da9210_constraints :
Javier Martinez Canillas072e78b2014-11-10 14:43:53 +0100201 of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
Steve Twiss16f10912013-08-06 15:30:48 +0100202 config.driver_data = chip;
203 config.regmap = chip->regmap;
Guennadi Liakhovetski937433c2013-09-12 14:28:35 +0200204 config.of_node = dev->of_node;
Steve Twiss16f10912013-08-06 15:30:48 +0100205
Geert Uytterhoeven4d9cbff52015-02-17 13:11:11 +0100206 /* Mask all interrupt sources to deassert interrupt line */
207 error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
208 if (!error)
209 error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
210 if (error) {
211 dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
212 return error;
213 }
214
Jingoo Han11c0da72013-09-30 09:53:57 +0900215 rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
Steve Twiss16f10912013-08-06 15:30:48 +0100216 if (IS_ERR(rdev)) {
217 dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
218 return PTR_ERR(rdev);
219 }
220
221 chip->rdev = rdev;
Geert Uytterhoeven42457462015-06-24 14:14:21 +0200222 if (i2c->irq) {
223 error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
224 da9210_irq_handler,
225 IRQF_TRIGGER_LOW |
226 IRQF_ONESHOT | IRQF_SHARED,
227 "da9210", chip);
228 if (error) {
229 dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
230 i2c->irq, error);
231 return error;
232 }
233
234 error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
235 DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
236 DA9210_M_TEMP_WARN |
237 DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
238 if (error < 0) {
239 dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
240 error);
241 return error;
242 }
243 } else {
244 dev_warn(&i2c->dev, "No IRQ configured\n");
245 }
Steve Twiss16f10912013-08-06 15:30:48 +0100246
247 i2c_set_clientdata(i2c, chip);
248
249 return 0;
250}
251
Steve Twiss16f10912013-08-06 15:30:48 +0100252static const struct i2c_device_id da9210_i2c_id[] = {
253 {"da9210", 0},
254 {},
255};
256
257MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
258
259static struct i2c_driver da9210_regulator_driver = {
260 .driver = {
261 .name = "da9210",
Steve Twiss16f10912013-08-06 15:30:48 +0100262 },
263 .probe = da9210_i2c_probe,
Steve Twiss16f10912013-08-06 15:30:48 +0100264 .id_table = da9210_i2c_id,
265};
266
267module_i2c_driver(da9210_regulator_driver);
268
269MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
270MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
271MODULE_LICENSE("GPL v2");