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1/*
2 * Voltage and current regulation for AD5398 and AD5821
3 *
4 * Copyright 2010 Analog Devices Inc.
5 *
6 * Enter bugs at http://blackfin.uclinux.org/
7 *
8 * Licensed under the GPL-2 or later.
9 */
10
11#include <linux/module.h>
12#include <linux/err.h>
13#include <linux/i2c.h>
14#include <linux/slab.h>
15#include <linux/platform_device.h>
16#include <linux/regulator/driver.h>
17#include <linux/regulator/machine.h>
18
19#define AD5398_CURRENT_EN_MASK 0x8000
20
21struct ad5398_chip_info {
22 struct i2c_client *client;
23 int min_uA;
24 int max_uA;
25 unsigned int current_level;
26 unsigned int current_mask;
27 unsigned int current_offset;
28 struct regulator_dev *rdev;
29};
30
31static int ad5398_calc_current(struct ad5398_chip_info *chip,
32 unsigned selector)
33{
34 unsigned range_uA = chip->max_uA - chip->min_uA;
35
36 return chip->min_uA + (selector * range_uA / chip->current_level);
37}
38
39static int ad5398_read_reg(struct i2c_client *client, unsigned short *data)
40{
41 unsigned short val;
42 int ret;
43
44 ret = i2c_master_recv(client, (char *)&val, 2);
45 if (ret < 0) {
46 dev_err(&client->dev, "I2C read error\n");
47 return ret;
48 }
49 *data = be16_to_cpu(val);
50
51 return ret;
52}
53
54static int ad5398_write_reg(struct i2c_client *client, const unsigned short data)
55{
56 unsigned short val;
57 int ret;
58
59 val = cpu_to_be16(data);
60 ret = i2c_master_send(client, (char *)&val, 2);
61 if (ret < 0)
62 dev_err(&client->dev, "I2C write error\n");
63
64 return ret;
65}
66
67static int ad5398_get_current_limit(struct regulator_dev *rdev)
68{
69 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
70 struct i2c_client *client = chip->client;
71 unsigned short data;
72 int ret;
73
74 ret = ad5398_read_reg(client, &data);
75 if (ret < 0)
76 return ret;
77
78 ret = (data & chip->current_mask) >> chip->current_offset;
79
80 return ad5398_calc_current(chip, ret);
81}
82
83static int ad5398_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
84{
85 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
86 struct i2c_client *client = chip->client;
87 unsigned range_uA = chip->max_uA - chip->min_uA;
88 unsigned selector;
89 unsigned short data;
90 int ret;
91
92 if (min_uA > chip->max_uA || min_uA < chip->min_uA)
93 return -EINVAL;
94 if (max_uA > chip->max_uA || max_uA < chip->min_uA)
95 return -EINVAL;
96
97 selector = ((min_uA - chip->min_uA) * chip->current_level +
98 range_uA - 1) / range_uA;
99 if (ad5398_calc_current(chip, selector) > max_uA)
100 return -EINVAL;
101
102 dev_dbg(&client->dev, "changing current %dmA\n",
103 ad5398_calc_current(chip, selector) / 1000);
104
105 /* read chip enable bit */
106 ret = ad5398_read_reg(client, &data);
107 if (ret < 0)
108 return ret;
109
110 /* prepare register data */
111 selector = (selector << chip->current_offset) & chip->current_mask;
112 data = (unsigned short)selector | (data & AD5398_CURRENT_EN_MASK);
113
114 /* write the new current value back as well as enable bit */
115 ret = ad5398_write_reg(client, data);
116
117 return ret;
118}
119
120static int ad5398_is_enabled(struct regulator_dev *rdev)
121{
122 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
123 struct i2c_client *client = chip->client;
124 unsigned short data;
125 int ret;
126
127 ret = ad5398_read_reg(client, &data);
128 if (ret < 0)
129 return ret;
130
131 if (data & AD5398_CURRENT_EN_MASK)
132 return 1;
133 else
134 return 0;
135}
136
137static int ad5398_enable(struct regulator_dev *rdev)
138{
139 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
140 struct i2c_client *client = chip->client;
141 unsigned short data;
142 int ret;
143
144 ret = ad5398_read_reg(client, &data);
145 if (ret < 0)
146 return ret;
147
148 if (data & AD5398_CURRENT_EN_MASK)
149 return 0;
150
151 data |= AD5398_CURRENT_EN_MASK;
152
153 ret = ad5398_write_reg(client, data);
154
155 return ret;
156}
157
158static int ad5398_disable(struct regulator_dev *rdev)
159{
160 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
161 struct i2c_client *client = chip->client;
162 unsigned short data;
163 int ret;
164
165 ret = ad5398_read_reg(client, &data);
166 if (ret < 0)
167 return ret;
168
169 if (!(data & AD5398_CURRENT_EN_MASK))
170 return 0;
171
172 data &= ~AD5398_CURRENT_EN_MASK;
173
174 ret = ad5398_write_reg(client, data);
175
176 return ret;
177}
178
179static struct regulator_ops ad5398_ops = {
180 .get_current_limit = ad5398_get_current_limit,
181 .set_current_limit = ad5398_set_current_limit,
182 .enable = ad5398_enable,
183 .disable = ad5398_disable,
184 .is_enabled = ad5398_is_enabled,
185};
186
187static struct regulator_desc ad5398_reg = {
188 .name = "isink",
189 .id = 0,
190 .ops = &ad5398_ops,
191 .type = REGULATOR_CURRENT,
192 .owner = THIS_MODULE,
193};
194
195struct ad5398_current_data_format {
196 int current_bits;
197 int current_offset;
198 int min_uA;
199 int max_uA;
200};
201
202static const struct ad5398_current_data_format df_10_4_120 = {10, 4, 0, 120000};
203
204static const struct i2c_device_id ad5398_id[] = {
205 { "ad5398", (kernel_ulong_t)&df_10_4_120 },
206 { "ad5821", (kernel_ulong_t)&df_10_4_120 },
207 { }
208};
209MODULE_DEVICE_TABLE(i2c, ad5398_id);
210
211static int __devinit ad5398_probe(struct i2c_client *client,
212 const struct i2c_device_id *id)
213{
214 struct regulator_init_data *init_data = client->dev.platform_data;
215 struct ad5398_chip_info *chip;
216 const struct ad5398_current_data_format *df =
217 (struct ad5398_current_data_format *)id->driver_data;
218 int ret;
219
220 if (!init_data)
221 return -EINVAL;
222
223 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
224 if (!chip)
225 return -ENOMEM;
226
227 chip->client = client;
228
229 chip->min_uA = df->min_uA;
230 chip->max_uA = df->max_uA;
231 chip->current_level = 1 << df->current_bits;
232 chip->current_offset = df->current_offset;
233 chip->current_mask = (chip->current_level - 1) << chip->current_offset;
234
235 chip->rdev = regulator_register(&ad5398_reg, &client->dev,
236 init_data, chip);
237 if (IS_ERR(chip->rdev)) {
238 ret = PTR_ERR(chip->rdev);
239 dev_err(&client->dev, "failed to register %s %s\n",
240 id->name, ad5398_reg.name);
241 goto err;
242 }
243
244 i2c_set_clientdata(client, chip);
245 dev_dbg(&client->dev, "%s regulator driver is registered.\n", id->name);
246 return 0;
247
248err:
249 kfree(chip);
250 return ret;
251}
252
253static int __devexit ad5398_remove(struct i2c_client *client)
254{
255 struct ad5398_chip_info *chip = i2c_get_clientdata(client);
256
257 regulator_unregister(chip->rdev);
258 kfree(chip);
259
260 return 0;
261}
262
263static struct i2c_driver ad5398_driver = {
264 .probe = ad5398_probe,
265 .remove = __devexit_p(ad5398_remove),
266 .driver = {
267 .name = "ad5398",
268 },
269 .id_table = ad5398_id,
270};
271
272static int __init ad5398_init(void)
273{
274 return i2c_add_driver(&ad5398_driver);
275}
276subsys_initcall(ad5398_init);
277
278static void __exit ad5398_exit(void)
279{
280 i2c_del_driver(&ad5398_driver);
281}
282module_exit(ad5398_exit);
283
284MODULE_DESCRIPTION("AD5398 and AD5821 current regulator driver");
285MODULE_AUTHOR("Sonic Zhang");
286MODULE_LICENSE("GPL");
287MODULE_ALIAS("i2c:ad5398-regulator");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Voltage and current regulation for AD5398 and AD5821
4 *
5 * Copyright 2010 Analog Devices Inc.
6 *
7 * Enter bugs at http://blackfin.uclinux.org/
8 */
9
10#include <linux/module.h>
11#include <linux/err.h>
12#include <linux/i2c.h>
13#include <linux/slab.h>
14#include <linux/platform_device.h>
15#include <linux/regulator/driver.h>
16#include <linux/regulator/machine.h>
17
18#define AD5398_CURRENT_EN_MASK 0x8000
19
20struct ad5398_chip_info {
21 struct i2c_client *client;
22 int min_uA;
23 int max_uA;
24 unsigned int current_level;
25 unsigned int current_mask;
26 unsigned int current_offset;
27 struct regulator_dev *rdev;
28};
29
30static int ad5398_calc_current(struct ad5398_chip_info *chip,
31 unsigned selector)
32{
33 unsigned range_uA = chip->max_uA - chip->min_uA;
34
35 return chip->min_uA + (selector * range_uA / chip->current_level);
36}
37
38static int ad5398_read_reg(struct i2c_client *client, unsigned short *data)
39{
40 unsigned short val;
41 int ret;
42
43 ret = i2c_master_recv(client, (char *)&val, 2);
44 if (ret < 0) {
45 dev_err(&client->dev, "I2C read error\n");
46 return ret;
47 }
48 *data = be16_to_cpu(val);
49
50 return ret;
51}
52
53static int ad5398_write_reg(struct i2c_client *client, const unsigned short data)
54{
55 unsigned short val;
56 int ret;
57
58 val = cpu_to_be16(data);
59 ret = i2c_master_send(client, (char *)&val, 2);
60 if (ret != 2) {
61 dev_err(&client->dev, "I2C write error\n");
62 return ret < 0 ? ret : -EIO;
63 }
64
65 return 0;
66}
67
68static int ad5398_get_current_limit(struct regulator_dev *rdev)
69{
70 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
71 struct i2c_client *client = chip->client;
72 unsigned short data;
73 int ret;
74
75 ret = ad5398_read_reg(client, &data);
76 if (ret < 0)
77 return ret;
78
79 ret = (data & chip->current_mask) >> chip->current_offset;
80
81 return ad5398_calc_current(chip, ret);
82}
83
84static int ad5398_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
85{
86 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
87 struct i2c_client *client = chip->client;
88 unsigned range_uA = chip->max_uA - chip->min_uA;
89 unsigned selector;
90 unsigned short data;
91 int ret;
92
93 if (min_uA < chip->min_uA)
94 min_uA = chip->min_uA;
95 if (max_uA > chip->max_uA)
96 max_uA = chip->max_uA;
97
98 if (min_uA > chip->max_uA || max_uA < chip->min_uA)
99 return -EINVAL;
100
101 selector = DIV_ROUND_UP((min_uA - chip->min_uA) * chip->current_level,
102 range_uA);
103 if (ad5398_calc_current(chip, selector) > max_uA)
104 return -EINVAL;
105
106 dev_dbg(&client->dev, "changing current %duA\n",
107 ad5398_calc_current(chip, selector));
108
109 /* read chip enable bit */
110 ret = ad5398_read_reg(client, &data);
111 if (ret < 0)
112 return ret;
113
114 /* prepare register data */
115 selector = (selector << chip->current_offset) & chip->current_mask;
116 data = (unsigned short)selector | (data & AD5398_CURRENT_EN_MASK);
117
118 /* write the new current value back as well as enable bit */
119 ret = ad5398_write_reg(client, data);
120
121 return ret;
122}
123
124static int ad5398_is_enabled(struct regulator_dev *rdev)
125{
126 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
127 struct i2c_client *client = chip->client;
128 unsigned short data;
129 int ret;
130
131 ret = ad5398_read_reg(client, &data);
132 if (ret < 0)
133 return ret;
134
135 if (data & AD5398_CURRENT_EN_MASK)
136 return 1;
137 else
138 return 0;
139}
140
141static int ad5398_enable(struct regulator_dev *rdev)
142{
143 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
144 struct i2c_client *client = chip->client;
145 unsigned short data;
146 int ret;
147
148 ret = ad5398_read_reg(client, &data);
149 if (ret < 0)
150 return ret;
151
152 if (data & AD5398_CURRENT_EN_MASK)
153 return 0;
154
155 data |= AD5398_CURRENT_EN_MASK;
156
157 ret = ad5398_write_reg(client, data);
158
159 return ret;
160}
161
162static int ad5398_disable(struct regulator_dev *rdev)
163{
164 struct ad5398_chip_info *chip = rdev_get_drvdata(rdev);
165 struct i2c_client *client = chip->client;
166 unsigned short data;
167 int ret;
168
169 ret = ad5398_read_reg(client, &data);
170 if (ret < 0)
171 return ret;
172
173 if (!(data & AD5398_CURRENT_EN_MASK))
174 return 0;
175
176 data &= ~AD5398_CURRENT_EN_MASK;
177
178 ret = ad5398_write_reg(client, data);
179
180 return ret;
181}
182
183static const struct regulator_ops ad5398_ops = {
184 .get_current_limit = ad5398_get_current_limit,
185 .set_current_limit = ad5398_set_current_limit,
186 .enable = ad5398_enable,
187 .disable = ad5398_disable,
188 .is_enabled = ad5398_is_enabled,
189};
190
191static const struct regulator_desc ad5398_reg = {
192 .name = "isink",
193 .id = 0,
194 .ops = &ad5398_ops,
195 .type = REGULATOR_CURRENT,
196 .owner = THIS_MODULE,
197};
198
199struct ad5398_current_data_format {
200 int current_bits;
201 int current_offset;
202 int min_uA;
203 int max_uA;
204};
205
206static const struct ad5398_current_data_format df_10_4_120 = {10, 4, 0, 120000};
207
208static const struct i2c_device_id ad5398_id[] = {
209 { "ad5398", (kernel_ulong_t)&df_10_4_120 },
210 { "ad5821", (kernel_ulong_t)&df_10_4_120 },
211 { }
212};
213MODULE_DEVICE_TABLE(i2c, ad5398_id);
214
215static int ad5398_probe(struct i2c_client *client)
216{
217 const struct i2c_device_id *id = i2c_client_get_device_id(client);
218 struct regulator_init_data *init_data = dev_get_platdata(&client->dev);
219 struct regulator_config config = { };
220 struct ad5398_chip_info *chip;
221 const struct ad5398_current_data_format *df =
222 (struct ad5398_current_data_format *)id->driver_data;
223
224 if (!init_data)
225 return -EINVAL;
226
227 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
228 if (!chip)
229 return -ENOMEM;
230
231 config.dev = &client->dev;
232 config.init_data = init_data;
233 config.driver_data = chip;
234
235 chip->client = client;
236
237 chip->min_uA = df->min_uA;
238 chip->max_uA = df->max_uA;
239 chip->current_level = 1 << df->current_bits;
240 chip->current_offset = df->current_offset;
241 chip->current_mask = (chip->current_level - 1) << chip->current_offset;
242
243 chip->rdev = devm_regulator_register(&client->dev, &ad5398_reg,
244 &config);
245 if (IS_ERR(chip->rdev)) {
246 dev_err(&client->dev, "failed to register %s %s\n",
247 id->name, ad5398_reg.name);
248 return PTR_ERR(chip->rdev);
249 }
250
251 i2c_set_clientdata(client, chip);
252 dev_dbg(&client->dev, "%s regulator driver is registered.\n", id->name);
253 return 0;
254}
255
256static struct i2c_driver ad5398_driver = {
257 .probe = ad5398_probe,
258 .driver = {
259 .name = "ad5398",
260 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
261 },
262 .id_table = ad5398_id,
263};
264
265static int __init ad5398_init(void)
266{
267 return i2c_add_driver(&ad5398_driver);
268}
269subsys_initcall(ad5398_init);
270
271static void __exit ad5398_exit(void)
272{
273 i2c_del_driver(&ad5398_driver);
274}
275module_exit(ad5398_exit);
276
277MODULE_DESCRIPTION("AD5398 and AD5821 current regulator driver");
278MODULE_AUTHOR("Sonic Zhang");
279MODULE_LICENSE("GPL");