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16#include <linux/err.h>
17#include <linux/gpio.h>
18#include <linux/i2c.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/slab.h>
22#include <linux/regulator/driver.h>
23#include <linux/regulator/machine.h>
24#include <linux/regmap.h>
25#include <linux/irq.h>
26#include <linux/interrupt.h>
27#include <linux/of_gpio.h>
28#include <linux/regulator/of_regulator.h>
29#include <linux/regulator/da9211.h>
30#include "da9211-regulator.h"
31
32
33#define DA9211_DEVICE_ID 0x22
34#define DA9213_DEVICE_ID 0x23
35
36#define DA9211_BUCK_MODE_SLEEP 1
37#define DA9211_BUCK_MODE_SYNC 2
38#define DA9211_BUCK_MODE_AUTO 3
39
40
41#define DA9211_ID_BUCKA 0
42#define DA9211_ID_BUCKB 1
43
44struct da9211 {
45 struct device *dev;
46 struct regmap *regmap;
47 struct da9211_pdata *pdata;
48 struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
49 int num_regulator;
50 int chip_irq;
51 int chip_id;
52};
53
54static const struct regmap_range_cfg da9211_regmap_range[] = {
55 {
56 .selector_reg = DA9211_REG_PAGE_CON,
57 .selector_mask = DA9211_REG_PAGE_MASK,
58 .selector_shift = DA9211_REG_PAGE_SHIFT,
59 .window_start = 0,
60 .window_len = 256,
61 .range_min = 0,
62 .range_max = 5*128,
63 },
64};
65
66static const struct regmap_config da9211_regmap_config = {
67 .reg_bits = 8,
68 .val_bits = 8,
69 .max_register = 5 * 128,
70 .ranges = da9211_regmap_range,
71 .num_ranges = ARRAY_SIZE(da9211_regmap_range),
72};
73
74
75#define DA9211_MIN_MV 300
76#define DA9211_MAX_MV 1570
77#define DA9211_STEP_MV 10
78
79
80
81
82static const int da9211_current_limits[] = {
83 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
84 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
85};
86
87
88
89static const int da9213_current_limits[] = {
90 3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
91 4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
92};
93
94static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
95{
96 int id = rdev_get_id(rdev);
97 struct da9211 *chip = rdev_get_drvdata(rdev);
98 unsigned int data;
99 int ret, mode = 0;
100
101 ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
102 if (ret < 0)
103 return ret;
104
105 switch (data & 0x03) {
106 case DA9211_BUCK_MODE_SYNC:
107 mode = REGULATOR_MODE_FAST;
108 break;
109 case DA9211_BUCK_MODE_AUTO:
110 mode = REGULATOR_MODE_NORMAL;
111 break;
112 case DA9211_BUCK_MODE_SLEEP:
113 mode = REGULATOR_MODE_STANDBY;
114 break;
115 }
116
117 return mode;
118}
119
120static int da9211_buck_set_mode(struct regulator_dev *rdev,
121 unsigned int mode)
122{
123 int id = rdev_get_id(rdev);
124 struct da9211 *chip = rdev_get_drvdata(rdev);
125 int val = 0;
126
127 switch (mode) {
128 case REGULATOR_MODE_FAST:
129 val = DA9211_BUCK_MODE_SYNC;
130 break;
131 case REGULATOR_MODE_NORMAL:
132 val = DA9211_BUCK_MODE_AUTO;
133 break;
134 case REGULATOR_MODE_STANDBY:
135 val = DA9211_BUCK_MODE_SLEEP;
136 break;
137 }
138
139 return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
140 0x03, val);
141}
142
143static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
144 int max)
145{
146 int id = rdev_get_id(rdev);
147 struct da9211 *chip = rdev_get_drvdata(rdev);
148 int i, max_size;
149 const int *current_limits;
150
151 switch (chip->chip_id) {
152 case DA9211:
153 current_limits = da9211_current_limits;
154 max_size = ARRAY_SIZE(da9211_current_limits)-1;
155 break;
156 case DA9213:
157 current_limits = da9213_current_limits;
158 max_size = ARRAY_SIZE(da9213_current_limits)-1;
159 break;
160 default:
161 return -EINVAL;
162 }
163
164
165 for (i = max_size; i >= 0; i--) {
166 if (min <= current_limits[i] &&
167 max >= current_limits[i]) {
168 return regmap_update_bits(chip->regmap,
169 DA9211_REG_BUCK_ILIM,
170 (0x0F << id*4), (i << id*4));
171 }
172 }
173
174 return -EINVAL;
175}
176
177static int da9211_get_current_limit(struct regulator_dev *rdev)
178{
179 int id = rdev_get_id(rdev);
180 struct da9211 *chip = rdev_get_drvdata(rdev);
181 unsigned int data;
182 int ret;
183 const int *current_limits;
184
185 switch (chip->chip_id) {
186 case DA9211:
187 current_limits = da9211_current_limits;
188 break;
189 case DA9213:
190 current_limits = da9213_current_limits;
191 break;
192 default:
193 return -EINVAL;
194 }
195
196 ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
197 if (ret < 0)
198 return ret;
199
200
201
202
203 data = (data >> id*4) & 0x0F;
204 return current_limits[data];
205}
206
207static struct regulator_ops da9211_buck_ops = {
208 .get_mode = da9211_buck_get_mode,
209 .set_mode = da9211_buck_set_mode,
210 .enable = regulator_enable_regmap,
211 .disable = regulator_disable_regmap,
212 .is_enabled = regulator_is_enabled_regmap,
213 .set_voltage_sel = regulator_set_voltage_sel_regmap,
214 .get_voltage_sel = regulator_get_voltage_sel_regmap,
215 .list_voltage = regulator_list_voltage_linear,
216 .set_current_limit = da9211_set_current_limit,
217 .get_current_limit = da9211_get_current_limit,
218};
219
220#define DA9211_BUCK(_id) \
221{\
222 .name = #_id,\
223 .ops = &da9211_buck_ops,\
224 .type = REGULATOR_VOLTAGE,\
225 .id = DA9211_ID_##_id,\
226 .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
227 .min_uV = (DA9211_MIN_MV * 1000),\
228 .uV_step = (DA9211_STEP_MV * 1000),\
229 .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
230 .enable_mask = DA9211_BUCKA_EN,\
231 .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
232 .vsel_mask = DA9211_VBUCK_MASK,\
233 .owner = THIS_MODULE,\
234}
235
236static struct regulator_desc da9211_regulators[] = {
237 DA9211_BUCK(BUCKA),
238 DA9211_BUCK(BUCKB),
239};
240
241#ifdef CONFIG_OF
242static struct of_regulator_match da9211_matches[] = {
243 [DA9211_ID_BUCKA] = { .name = "BUCKA" },
244 [DA9211_ID_BUCKB] = { .name = "BUCKB" },
245 };
246
247static struct da9211_pdata *da9211_parse_regulators_dt(
248 struct device *dev)
249{
250 struct da9211_pdata *pdata;
251 struct device_node *node;
252 int i, num, n;
253
254 node = of_get_child_by_name(dev->of_node, "regulators");
255 if (!node) {
256 dev_err(dev, "regulators node not found\n");
257 return ERR_PTR(-ENODEV);
258 }
259
260 num = of_regulator_match(dev, node, da9211_matches,
261 ARRAY_SIZE(da9211_matches));
262 of_node_put(node);
263 if (num < 0) {
264 dev_err(dev, "Failed to match regulators\n");
265 return ERR_PTR(-EINVAL);
266 }
267
268 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
269 if (!pdata)
270 return ERR_PTR(-ENOMEM);
271
272 pdata->num_buck = num;
273
274 n = 0;
275 for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
276 if (!da9211_matches[i].init_data)
277 continue;
278
279 pdata->init_data[n] = da9211_matches[i].init_data;
280 pdata->reg_node[n] = da9211_matches[i].of_node;
281 pdata->gpio_ren[n] =
282 of_get_named_gpio(da9211_matches[i].of_node,
283 "enable-gpios", 0);
284 n++;
285 }
286
287 return pdata;
288}
289#else
290static struct da9211_pdata *da9211_parse_regulators_dt(
291 struct device *dev)
292{
293 return ERR_PTR(-ENODEV);
294}
295#endif
296
297static irqreturn_t da9211_irq_handler(int irq, void *data)
298{
299 struct da9211 *chip = data;
300 int reg_val, err, ret = IRQ_NONE;
301
302 err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val);
303 if (err < 0)
304 goto error_i2c;
305
306 if (reg_val & DA9211_E_OV_CURR_A) {
307 regulator_notifier_call_chain(chip->rdev[0],
308 REGULATOR_EVENT_OVER_CURRENT, NULL);
309
310 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
311 DA9211_E_OV_CURR_A);
312 if (err < 0)
313 goto error_i2c;
314
315 ret = IRQ_HANDLED;
316 }
317
318 if (reg_val & DA9211_E_OV_CURR_B) {
319 regulator_notifier_call_chain(chip->rdev[1],
320 REGULATOR_EVENT_OVER_CURRENT, NULL);
321
322 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
323 DA9211_E_OV_CURR_B);
324 if (err < 0)
325 goto error_i2c;
326
327 ret = IRQ_HANDLED;
328 }
329
330 return ret;
331
332error_i2c:
333 dev_err(chip->dev, "I2C error : %d\n", err);
334 return IRQ_NONE;
335}
336
337static int da9211_regulator_init(struct da9211 *chip)
338{
339 struct regulator_config config = { };
340 int i, ret;
341 unsigned int data;
342
343 ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
344 if (ret < 0) {
345 dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
346 return ret;
347 }
348
349 data &= DA9211_SLAVE_SEL;
350
351
352
353 if ((chip->pdata->num_buck == 2 && data == 0x40)
354 || (chip->pdata->num_buck == 1 && data == 0x00)) {
355 if (data == 0)
356 chip->num_regulator = 1;
357 else
358 chip->num_regulator = 2;
359 } else {
360 dev_err(chip->dev, "Configuration is mismatched\n");
361 return -EINVAL;
362 }
363
364 for (i = 0; i < chip->num_regulator; i++) {
365 config.init_data = chip->pdata->init_data[i];
366 config.dev = chip->dev;
367 config.driver_data = chip;
368 config.regmap = chip->regmap;
369 config.of_node = chip->pdata->reg_node[i];
370
371 if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
372 config.ena_gpio = chip->pdata->gpio_ren[i];
373 config.ena_gpio_initialized = true;
374 } else {
375 config.ena_gpio = -EINVAL;
376 config.ena_gpio_initialized = false;
377 }
378
379 chip->rdev[i] = devm_regulator_register(chip->dev,
380 &da9211_regulators[i], &config);
381 if (IS_ERR(chip->rdev[i])) {
382 dev_err(chip->dev,
383 "Failed to register DA9211 regulator\n");
384 return PTR_ERR(chip->rdev[i]);
385 }
386
387 if (chip->chip_irq != 0) {
388 ret = regmap_update_bits(chip->regmap,
389 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
390 if (ret < 0) {
391 dev_err(chip->dev,
392 "Failed to update mask reg: %d\n", ret);
393 return ret;
394 }
395 }
396 }
397
398 return 0;
399}
400
401
402
403
404static int da9211_i2c_probe(struct i2c_client *i2c,
405 const struct i2c_device_id *id)
406{
407 struct da9211 *chip;
408 int error, ret;
409 unsigned int data;
410
411 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
412 if (!chip)
413 return -ENOMEM;
414
415 chip->dev = &i2c->dev;
416 chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
417 if (IS_ERR(chip->regmap)) {
418 error = PTR_ERR(chip->regmap);
419 dev_err(chip->dev, "Failed to allocate register map: %d\n",
420 error);
421 return error;
422 }
423
424 i2c_set_clientdata(i2c, chip);
425
426 chip->pdata = i2c->dev.platform_data;
427
428 ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
429 if (ret < 0) {
430 dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
431 return ret;
432 }
433
434 switch (data) {
435 case DA9211_DEVICE_ID:
436 chip->chip_id = DA9211;
437 break;
438 case DA9213_DEVICE_ID:
439 chip->chip_id = DA9213;
440 break;
441 default:
442 dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
443 return -ENODEV;
444 }
445
446 if (!chip->pdata)
447 chip->pdata = da9211_parse_regulators_dt(chip->dev);
448
449 if (IS_ERR(chip->pdata)) {
450 dev_err(chip->dev, "No regulators defined for the platform\n");
451 return PTR_ERR(chip->pdata);
452 }
453
454 chip->chip_irq = i2c->irq;
455
456 if (chip->chip_irq != 0) {
457 ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
458 da9211_irq_handler,
459 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
460 "da9211", chip);
461 if (ret != 0) {
462 dev_err(chip->dev, "Failed to request IRQ: %d\n",
463 chip->chip_irq);
464 return ret;
465 }
466 } else {
467 dev_warn(chip->dev, "No IRQ configured\n");
468 }
469
470 ret = da9211_regulator_init(chip);
471
472 if (ret < 0)
473 dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
474
475 return ret;
476}
477
478static const struct i2c_device_id da9211_i2c_id[] = {
479 {"da9211", DA9211},
480 {"da9213", DA9213},
481 {},
482};
483MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
484
485#ifdef CONFIG_OF
486static const struct of_device_id da9211_dt_ids[] = {
487 { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
488 { .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] },
489 {},
490};
491MODULE_DEVICE_TABLE(of, da9211_dt_ids);
492#endif
493
494static struct i2c_driver da9211_regulator_driver = {
495 .driver = {
496 .name = "da9211",
497 .owner = THIS_MODULE,
498 .of_match_table = of_match_ptr(da9211_dt_ids),
499 },
500 .probe = da9211_i2c_probe,
501 .id_table = da9211_i2c_id,
502};
503
504module_i2c_driver(da9211_regulator_driver);
505
506MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
507MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213");
508MODULE_LICENSE("GPL v2");
509
