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20#include <linux/module.h>
21#include <linux/err.h>
22#include <linux/i2c.h>
23#include <linux/platform_device.h>
24#include <linux/regulator/driver.h>
25#include <linux/slab.h>
26#include <linux/regulator/max1586.h>
27#include <linux/of_device.h>
28#include <linux/regulator/of_regulator.h>
29
30#define MAX1586_V3_MAX_VSEL 31
31#define MAX1586_V6_MAX_VSEL 3
32
33#define MAX1586_V3_MIN_UV 700000
34#define MAX1586_V3_MAX_UV 1475000
35
36#define MAX1586_V6_MIN_UV 0
37#define MAX1586_V6_MAX_UV 3000000
38
39#define I2C_V3_SELECT (0 << 5)
40#define I2C_V6_SELECT (1 << 5)
41
42struct max1586_data {
43 struct i2c_client *client;
44
45
46 unsigned int min_uV;
47 unsigned int max_uV;
48
49 unsigned int v3_curr_sel;
50 unsigned int v6_curr_sel;
51};
52
53
54
55
56
57
58
59static const unsigned int v6_voltages_uv[] = { 1, 1800000, 2500000, 3000000 };
60
61
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63
64
65
66
67
68
69static int max1586_v3_get_voltage_sel(struct regulator_dev *rdev)
70{
71 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
72
73 return max1586->v3_curr_sel;
74}
75
76static int max1586_v3_set_voltage_sel(struct regulator_dev *rdev,
77 unsigned selector)
78{
79 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
80 struct i2c_client *client = max1586->client;
81 int ret;
82 u8 v3_prog;
83
84 dev_dbg(&client->dev, "changing voltage v3 to %dmv\n",
85 regulator_list_voltage_linear(rdev, selector) / 1000);
86
87 v3_prog = I2C_V3_SELECT | (u8) selector;
88 ret = i2c_smbus_write_byte(client, v3_prog);
89 if (ret)
90 return ret;
91
92 max1586->v3_curr_sel = selector;
93
94 return 0;
95}
96
97static int max1586_v6_get_voltage_sel(struct regulator_dev *rdev)
98{
99 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
100
101 return max1586->v6_curr_sel;
102}
103
104static int max1586_v6_set_voltage_sel(struct regulator_dev *rdev,
105 unsigned int selector)
106{
107 struct max1586_data *max1586 = rdev_get_drvdata(rdev);
108 struct i2c_client *client = max1586->client;
109 u8 v6_prog;
110 int ret;
111
112 dev_dbg(&client->dev, "changing voltage v6 to %dmv\n",
113 rdev->desc->volt_table[selector] / 1000);
114
115 v6_prog = I2C_V6_SELECT | (u8) selector;
116 ret = i2c_smbus_write_byte(client, v6_prog);
117 if (ret)
118 return ret;
119
120 max1586->v6_curr_sel = selector;
121
122 return 0;
123}
124
125
126
127
128
129static const struct regulator_ops max1586_v3_ops = {
130 .get_voltage_sel = max1586_v3_get_voltage_sel,
131 .set_voltage_sel = max1586_v3_set_voltage_sel,
132 .list_voltage = regulator_list_voltage_linear,
133 .map_voltage = regulator_map_voltage_linear,
134};
135
136static const struct regulator_ops max1586_v6_ops = {
137 .get_voltage_sel = max1586_v6_get_voltage_sel,
138 .set_voltage_sel = max1586_v6_set_voltage_sel,
139 .list_voltage = regulator_list_voltage_table,
140};
141
142static struct regulator_desc max1586_reg[] = {
143 {
144 .name = "Output_V3",
145 .id = MAX1586_V3,
146 .ops = &max1586_v3_ops,
147 .type = REGULATOR_VOLTAGE,
148 .n_voltages = MAX1586_V3_MAX_VSEL + 1,
149 .owner = THIS_MODULE,
150 },
151 {
152 .name = "Output_V6",
153 .id = MAX1586_V6,
154 .ops = &max1586_v6_ops,
155 .type = REGULATOR_VOLTAGE,
156 .n_voltages = MAX1586_V6_MAX_VSEL + 1,
157 .volt_table = v6_voltages_uv,
158 .owner = THIS_MODULE,
159 },
160};
161
162static int of_get_max1586_platform_data(struct device *dev,
163 struct max1586_platform_data *pdata)
164{
165 struct max1586_subdev_data *sub;
166 struct of_regulator_match rmatch[ARRAY_SIZE(max1586_reg)] = { };
167 struct device_node *np = dev->of_node;
168 int i, matched;
169
170 if (of_property_read_u32(np, "v3-gain",
171 &pdata->v3_gain) < 0) {
172 dev_err(dev, "%s has no 'v3-gain' property\n", np->full_name);
173 return -EINVAL;
174 }
175
176 np = of_get_child_by_name(np, "regulators");
177 if (!np) {
178 dev_err(dev, "missing 'regulators' subnode in DT\n");
179 return -EINVAL;
180 }
181
182 for (i = 0; i < ARRAY_SIZE(rmatch); i++)
183 rmatch[i].name = max1586_reg[i].name;
184
185 matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
186 of_node_put(np);
187
188
189
190
191
192
193
194 if (matched <= 0)
195 return matched;
196
197 pdata->subdevs = devm_kzalloc(dev, sizeof(struct max1586_subdev_data) *
198 matched, GFP_KERNEL);
199 if (!pdata->subdevs)
200 return -ENOMEM;
201
202 pdata->num_subdevs = matched;
203 sub = pdata->subdevs;
204
205 for (i = 0; i < matched; i++) {
206 sub->id = i;
207 sub->name = rmatch[i].of_node->name;
208 sub->platform_data = rmatch[i].init_data;
209 sub++;
210 }
211
212 return 0;
213}
214
215static const struct of_device_id max1586_of_match[] = {
216 { .compatible = "maxim,max1586", },
217 {},
218};
219MODULE_DEVICE_TABLE(of, max1586_of_match);
220
221static int max1586_pmic_probe(struct i2c_client *client,
222 const struct i2c_device_id *i2c_id)
223{
224 struct max1586_platform_data *pdata, pdata_of;
225 struct regulator_config config = { };
226 struct max1586_data *max1586;
227 int i, id, ret;
228 const struct of_device_id *match;
229
230 pdata = dev_get_platdata(&client->dev);
231 if (client->dev.of_node && !pdata) {
232 match = of_match_device(of_match_ptr(max1586_of_match),
233 &client->dev);
234 if (!match) {
235 dev_err(&client->dev, "Error: No device match found\n");
236 return -ENODEV;
237 }
238 ret = of_get_max1586_platform_data(&client->dev, &pdata_of);
239 if (ret < 0)
240 return ret;
241 pdata = &pdata_of;
242 }
243
244 max1586 = devm_kzalloc(&client->dev, sizeof(struct max1586_data),
245 GFP_KERNEL);
246 if (!max1586)
247 return -ENOMEM;
248
249 max1586->client = client;
250
251 if (!pdata->v3_gain)
252 return -EINVAL;
253
254 max1586->min_uV = MAX1586_V3_MIN_UV / 1000 * pdata->v3_gain / 1000;
255 max1586->max_uV = MAX1586_V3_MAX_UV / 1000 * pdata->v3_gain / 1000;
256
257
258 max1586->v3_curr_sel = 24;
259 max1586->v6_curr_sel = 0;
260
261 for (i = 0; i < pdata->num_subdevs && i <= MAX1586_V6; i++) {
262 struct regulator_dev *rdev;
263
264 id = pdata->subdevs[i].id;
265 if (!pdata->subdevs[i].platform_data)
266 continue;
267 if (id < MAX1586_V3 || id > MAX1586_V6) {
268 dev_err(&client->dev, "invalid regulator id %d\n", id);
269 return -EINVAL;
270 }
271
272 if (id == MAX1586_V3) {
273 max1586_reg[id].min_uV = max1586->min_uV;
274 max1586_reg[id].uV_step =
275 (max1586->max_uV - max1586->min_uV) /
276 MAX1586_V3_MAX_VSEL;
277 }
278
279 config.dev = &client->dev;
280 config.init_data = pdata->subdevs[i].platform_data;
281 config.driver_data = max1586;
282
283 rdev = devm_regulator_register(&client->dev,
284 &max1586_reg[id], &config);
285 if (IS_ERR(rdev)) {
286 dev_err(&client->dev, "failed to register %s\n",
287 max1586_reg[id].name);
288 return PTR_ERR(rdev);
289 }
290 }
291
292 i2c_set_clientdata(client, max1586);
293 dev_info(&client->dev, "Maxim 1586 regulator driver loaded\n");
294 return 0;
295}
296
297static const struct i2c_device_id max1586_id[] = {
298 { "max1586", 0 },
299 { }
300};
301MODULE_DEVICE_TABLE(i2c, max1586_id);
302
303static struct i2c_driver max1586_pmic_driver = {
304 .probe = max1586_pmic_probe,
305 .driver = {
306 .name = "max1586",
307 .of_match_table = of_match_ptr(max1586_of_match),
308 },
309 .id_table = max1586_id,
310};
311
312static int __init max1586_pmic_init(void)
313{
314 return i2c_add_driver(&max1586_pmic_driver);
315}
316subsys_initcall(max1586_pmic_init);
317
318static void __exit max1586_pmic_exit(void)
319{
320 i2c_del_driver(&max1586_pmic_driver);
321}
322module_exit(max1586_pmic_exit);
323
324
325MODULE_DESCRIPTION("MAXIM 1586 voltage regulator driver");
326MODULE_AUTHOR("Robert Jarzmik");
327MODULE_LICENSE("GPL");
328
