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40#include <linux/module.h>
41#include <linux/err.h>
42#include <linux/i2c.h>
43#include <linux/platform_device.h>
44#include <linux/regulator/driver.h>
45#include <linux/slab.h>
46#include <linux/regulator/max8660.h>
47#include <linux/of.h>
48#include <linux/of_device.h>
49#include <linux/regulator/of_regulator.h>
50
51#define MAX8660_DCDC_MIN_UV 725000
52#define MAX8660_DCDC_MAX_UV 1800000
53#define MAX8660_DCDC_STEP 25000
54#define MAX8660_DCDC_MAX_SEL 0x2b
55
56#define MAX8660_LDO5_MIN_UV 1700000
57#define MAX8660_LDO5_MAX_UV 2000000
58#define MAX8660_LDO5_STEP 25000
59#define MAX8660_LDO5_MAX_SEL 0x0c
60
61#define MAX8660_LDO67_MIN_UV 1800000
62#define MAX8660_LDO67_MAX_UV 3300000
63#define MAX8660_LDO67_STEP 100000
64#define MAX8660_LDO67_MAX_SEL 0x0f
65
66enum {
67 MAX8660_OVER1,
68 MAX8660_OVER2,
69 MAX8660_VCC1,
70 MAX8660_ADTV1,
71 MAX8660_ADTV2,
72 MAX8660_SDTV1,
73 MAX8660_SDTV2,
74 MAX8660_MDTV1,
75 MAX8660_MDTV2,
76 MAX8660_L12VCR,
77 MAX8660_FPWM,
78 MAX8660_N_REGS,
79};
80
81struct max8660 {
82 struct i2c_client *client;
83 u8 shadow_regs[MAX8660_N_REGS];
84};
85
86static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
87{
88 static const u8 max8660_addresses[MAX8660_N_REGS] = {
89 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80
90 };
91
92 int ret;
93 u8 reg_val = (max8660->shadow_regs[reg] & mask) | val;
94
95 dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
96 max8660_addresses[reg], reg_val);
97
98 ret = i2c_smbus_write_byte_data(max8660->client,
99 max8660_addresses[reg], reg_val);
100 if (ret == 0)
101 max8660->shadow_regs[reg] = reg_val;
102
103 return ret;
104}
105
106
107
108
109
110
111static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
112{
113 struct max8660 *max8660 = rdev_get_drvdata(rdev);
114 u8 val = max8660->shadow_regs[MAX8660_OVER1];
115 u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
116
117 return !!(val & mask);
118}
119
120static int max8660_dcdc_enable(struct regulator_dev *rdev)
121{
122 struct max8660 *max8660 = rdev_get_drvdata(rdev);
123 u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
124
125 return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
126}
127
128static int max8660_dcdc_disable(struct regulator_dev *rdev)
129{
130 struct max8660 *max8660 = rdev_get_drvdata(rdev);
131 u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
132
133 return max8660_write(max8660, MAX8660_OVER1, mask, 0);
134}
135
136static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
137{
138 struct max8660 *max8660 = rdev_get_drvdata(rdev);
139 u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
140 u8 selector = max8660->shadow_regs[reg];
141
142 return selector;
143}
144
145static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
146 unsigned int selector)
147{
148 struct max8660 *max8660 = rdev_get_drvdata(rdev);
149 u8 reg, bits;
150 int ret;
151
152 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
153 ret = max8660_write(max8660, reg, 0, selector);
154 if (ret)
155 return ret;
156
157
158 bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
159 return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
160}
161
162static struct regulator_ops max8660_dcdc_ops = {
163 .is_enabled = max8660_dcdc_is_enabled,
164 .list_voltage = regulator_list_voltage_linear,
165 .map_voltage = regulator_map_voltage_linear,
166 .set_voltage_sel = max8660_dcdc_set_voltage_sel,
167 .get_voltage_sel = max8660_dcdc_get_voltage_sel,
168};
169
170
171
172
173
174
175static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
176{
177 struct max8660 *max8660 = rdev_get_drvdata(rdev);
178
179 u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
180 return selector;
181}
182
183static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
184 unsigned int selector)
185{
186 struct max8660 *max8660 = rdev_get_drvdata(rdev);
187 int ret;
188
189 ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
190 if (ret)
191 return ret;
192
193
194 return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
195}
196
197static struct regulator_ops max8660_ldo5_ops = {
198 .list_voltage = regulator_list_voltage_linear,
199 .map_voltage = regulator_map_voltage_linear,
200 .set_voltage_sel = max8660_ldo5_set_voltage_sel,
201 .get_voltage_sel = max8660_ldo5_get_voltage_sel,
202};
203
204
205
206
207
208
209static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
210{
211 struct max8660 *max8660 = rdev_get_drvdata(rdev);
212 u8 val = max8660->shadow_regs[MAX8660_OVER2];
213 u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
214
215 return !!(val & mask);
216}
217
218static int max8660_ldo67_enable(struct regulator_dev *rdev)
219{
220 struct max8660 *max8660 = rdev_get_drvdata(rdev);
221 u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
222
223 return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
224}
225
226static int max8660_ldo67_disable(struct regulator_dev *rdev)
227{
228 struct max8660 *max8660 = rdev_get_drvdata(rdev);
229 u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
230
231 return max8660_write(max8660, MAX8660_OVER2, mask, 0);
232}
233
234static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
235{
236 struct max8660 *max8660 = rdev_get_drvdata(rdev);
237 u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
238 u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
239
240 return selector;
241}
242
243static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
244 unsigned int selector)
245{
246 struct max8660 *max8660 = rdev_get_drvdata(rdev);
247
248 if (rdev_get_id(rdev) == MAX8660_V6)
249 return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
250 else
251 return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
252 selector << 4);
253}
254
255static struct regulator_ops max8660_ldo67_ops = {
256 .is_enabled = max8660_ldo67_is_enabled,
257 .enable = max8660_ldo67_enable,
258 .disable = max8660_ldo67_disable,
259 .list_voltage = regulator_list_voltage_linear,
260 .map_voltage = regulator_map_voltage_linear,
261 .get_voltage_sel = max8660_ldo67_get_voltage_sel,
262 .set_voltage_sel = max8660_ldo67_set_voltage_sel,
263};
264
265static const struct regulator_desc max8660_reg[] = {
266 {
267 .name = "V3(DCDC)",
268 .id = MAX8660_V3,
269 .ops = &max8660_dcdc_ops,
270 .type = REGULATOR_VOLTAGE,
271 .n_voltages = MAX8660_DCDC_MAX_SEL + 1,
272 .owner = THIS_MODULE,
273 .min_uV = MAX8660_DCDC_MIN_UV,
274 .uV_step = MAX8660_DCDC_STEP,
275 },
276 {
277 .name = "V4(DCDC)",
278 .id = MAX8660_V4,
279 .ops = &max8660_dcdc_ops,
280 .type = REGULATOR_VOLTAGE,
281 .n_voltages = MAX8660_DCDC_MAX_SEL + 1,
282 .owner = THIS_MODULE,
283 .min_uV = MAX8660_DCDC_MIN_UV,
284 .uV_step = MAX8660_DCDC_STEP,
285 },
286 {
287 .name = "V5(LDO)",
288 .id = MAX8660_V5,
289 .ops = &max8660_ldo5_ops,
290 .type = REGULATOR_VOLTAGE,
291 .n_voltages = MAX8660_LDO5_MAX_SEL + 1,
292 .owner = THIS_MODULE,
293 .min_uV = MAX8660_LDO5_MIN_UV,
294 .uV_step = MAX8660_LDO5_STEP,
295 },
296 {
297 .name = "V6(LDO)",
298 .id = MAX8660_V6,
299 .ops = &max8660_ldo67_ops,
300 .type = REGULATOR_VOLTAGE,
301 .n_voltages = MAX8660_LDO67_MAX_SEL + 1,
302 .owner = THIS_MODULE,
303 .min_uV = MAX8660_LDO67_MIN_UV,
304 .uV_step = MAX8660_LDO67_STEP,
305 },
306 {
307 .name = "V7(LDO)",
308 .id = MAX8660_V7,
309 .ops = &max8660_ldo67_ops,
310 .type = REGULATOR_VOLTAGE,
311 .n_voltages = MAX8660_LDO67_MAX_SEL + 1,
312 .owner = THIS_MODULE,
313 .min_uV = MAX8660_LDO67_MIN_UV,
314 .uV_step = MAX8660_LDO67_STEP,
315 },
316};
317
318enum {
319 MAX8660 = 0,
320 MAX8661 = 1,
321};
322
323#ifdef CONFIG_OF
324static const struct of_device_id max8660_dt_ids[] = {
325 { .compatible = "maxim,max8660", .data = (void *) MAX8660 },
326 { .compatible = "maxim,max8661", .data = (void *) MAX8661 },
327 { }
328};
329MODULE_DEVICE_TABLE(of, max8660_dt_ids);
330
331static int max8660_pdata_from_dt(struct device *dev,
332 struct device_node **of_node,
333 struct max8660_platform_data *pdata)
334{
335 int matched, i;
336 struct device_node *np;
337 struct max8660_subdev_data *sub;
338 struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)] = { };
339
340 np = of_get_child_by_name(dev->of_node, "regulators");
341 if (!np) {
342 dev_err(dev, "missing 'regulators' subnode in DT\n");
343 return -EINVAL;
344 }
345
346 for (i = 0; i < ARRAY_SIZE(rmatch); i++)
347 rmatch[i].name = max8660_reg[i].name;
348
349 matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
350 of_node_put(np);
351 if (matched <= 0)
352 return matched;
353
354 pdata->subdevs = devm_kzalloc(dev, sizeof(struct max8660_subdev_data) *
355 matched, GFP_KERNEL);
356 if (!pdata->subdevs)
357 return -ENOMEM;
358
359 pdata->num_subdevs = matched;
360 sub = pdata->subdevs;
361
362 for (i = 0; i < matched; i++) {
363 sub->id = i;
364 sub->name = rmatch[i].name;
365 sub->platform_data = rmatch[i].init_data;
366 of_node[i] = rmatch[i].of_node;
367 sub++;
368 }
369
370 return 0;
371}
372#else
373static inline int max8660_pdata_from_dt(struct device *dev,
374 struct device_node **of_node,
375 struct max8660_platform_data *pdata)
376{
377 return 0;
378}
379#endif
380
381static int max8660_probe(struct i2c_client *client,
382 const struct i2c_device_id *i2c_id)
383{
384 struct device *dev = &client->dev;
385 struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev);
386 struct regulator_config config = { };
387 struct max8660 *max8660;
388 int boot_on, i, id, ret = -EINVAL;
389 struct device_node *of_node[MAX8660_V_END];
390 unsigned long type;
391
392 if (dev->of_node && !pdata) {
393 const struct of_device_id *id;
394
395 id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
396 if (!id)
397 return -ENODEV;
398
399 ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
400 if (ret < 0)
401 return ret;
402
403 pdata = &pdata_of;
404 type = (unsigned long) id->data;
405 } else {
406 type = i2c_id->driver_data;
407 memset(of_node, 0, sizeof(of_node));
408 }
409
410 if (pdata->num_subdevs > MAX8660_V_END) {
411 dev_err(dev, "Too many regulators found!\n");
412 return -EINVAL;
413 }
414
415 max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
416 if (!max8660)
417 return -ENOMEM;
418
419 max8660->client = client;
420
421 if (pdata->en34_is_high) {
422
423 max8660->shadow_regs[MAX8660_OVER1] = 5;
424 } else {
425
426 max8660_dcdc_ops.enable = max8660_dcdc_enable;
427 max8660_dcdc_ops.disable = max8660_dcdc_disable;
428 }
429
430
431
432
433
434
435 max8660->shadow_regs[MAX8660_ADTV1] =
436 max8660->shadow_regs[MAX8660_ADTV2] =
437 max8660->shadow_regs[MAX8660_SDTV1] =
438 max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
439 max8660->shadow_regs[MAX8660_MDTV1] =
440 max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
441
442 for (i = 0; i < pdata->num_subdevs; i++) {
443
444 if (!pdata->subdevs[i].platform_data)
445 boot_on = false;
446 else
447 boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
448
449 switch (pdata->subdevs[i].id) {
450 case MAX8660_V3:
451 if (boot_on)
452 max8660->shadow_regs[MAX8660_OVER1] |= 1;
453 break;
454
455 case MAX8660_V4:
456 if (boot_on)
457 max8660->shadow_regs[MAX8660_OVER1] |= 4;
458 break;
459
460 case MAX8660_V5:
461 break;
462
463 case MAX8660_V6:
464 if (boot_on)
465 max8660->shadow_regs[MAX8660_OVER2] |= 2;
466 break;
467
468 case MAX8660_V7:
469 if (type == MAX8661) {
470 dev_err(dev, "Regulator not on this chip!\n");
471 return -EINVAL;
472 }
473
474 if (boot_on)
475 max8660->shadow_regs[MAX8660_OVER2] |= 4;
476 break;
477
478 default:
479 dev_err(dev, "invalid regulator %s\n",
480 pdata->subdevs[i].name);
481 return ret;
482 }
483 }
484
485
486 for (i = 0; i < pdata->num_subdevs; i++) {
487 struct regulator_dev *rdev;
488
489 id = pdata->subdevs[i].id;
490
491 config.dev = dev;
492 config.init_data = pdata->subdevs[i].platform_data;
493 config.of_node = of_node[i];
494 config.driver_data = max8660;
495
496 rdev = devm_regulator_register(&client->dev,
497 &max8660_reg[id], &config);
498 if (IS_ERR(rdev)) {
499 ret = PTR_ERR(rdev);
500 dev_err(&client->dev, "failed to register %s\n",
501 max8660_reg[id].name);
502 return PTR_ERR(rdev);
503 }
504 }
505
506 i2c_set_clientdata(client, max8660);
507 return 0;
508}
509
510static const struct i2c_device_id max8660_id[] = {
511 { .name = "max8660", .driver_data = MAX8660 },
512 { .name = "max8661", .driver_data = MAX8661 },
513 { }
514};
515MODULE_DEVICE_TABLE(i2c, max8660_id);
516
517static struct i2c_driver max8660_driver = {
518 .probe = max8660_probe,
519 .driver = {
520 .name = "max8660",
521 },
522 .id_table = max8660_id,
523};
524
525static int __init max8660_init(void)
526{
527 return i2c_add_driver(&max8660_driver);
528}
529subsys_initcall(max8660_init);
530
531static void __exit max8660_exit(void)
532{
533 i2c_del_driver(&max8660_driver);
534}
535module_exit(max8660_exit);
536
537
538MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
539MODULE_AUTHOR("Wolfram Sang");
540MODULE_LICENSE("GPL v2");
541
