Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * max8660.c -- Voltage regulation for the Maxim 8660/8661
4 *
5 * based on max1586.c and wm8400-regulator.c
6 *
7 * Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.
8 *
9 * Some info:
10 *
11 * Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf
12 *
13 * This chip is a bit nasty because it is a write-only device. Thus, the driver
14 * uses shadow registers to keep track of its values. The main problem appears
15 * to be the initialization: When Linux boots up, we cannot know if the chip is
16 * in the default state or not, so we would have to pass such information in
17 * platform_data. As this adds a bit of complexity to the driver, this is left
18 * out for now until it is really needed.
19 *
20 * [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2.
21 *
22 * If the driver is feature complete, it might be worth to check if one set of
23 * functions for V3-V7 is sufficient. For maximum flexibility during
24 * development, they are separated for now.
25 */
26
27#include <linux/module.h>
28#include <linux/err.h>
29#include <linux/i2c.h>
30#include <linux/platform_device.h>
31#include <linux/regulator/driver.h>
32#include <linux/slab.h>
33#include <linux/regulator/max8660.h>
34#include <linux/of.h>
35#include <linux/of_device.h>
36#include <linux/regulator/of_regulator.h>
37
38#define MAX8660_DCDC_MIN_UV 725000
39#define MAX8660_DCDC_MAX_UV 1800000
40#define MAX8660_DCDC_STEP 25000
41#define MAX8660_DCDC_MAX_SEL 0x2b
42
43#define MAX8660_LDO5_MIN_UV 1700000
44#define MAX8660_LDO5_MAX_UV 2000000
45#define MAX8660_LDO5_STEP 25000
46#define MAX8660_LDO5_MAX_SEL 0x0c
47
48#define MAX8660_LDO67_MIN_UV 1800000
49#define MAX8660_LDO67_MAX_UV 3300000
50#define MAX8660_LDO67_STEP 100000
51#define MAX8660_LDO67_MAX_SEL 0x0f
52
53enum {
54 MAX8660_OVER1,
55 MAX8660_OVER2,
56 MAX8660_VCC1,
57 MAX8660_ADTV1,
58 MAX8660_ADTV2,
59 MAX8660_SDTV1,
60 MAX8660_SDTV2,
61 MAX8660_MDTV1,
62 MAX8660_MDTV2,
63 MAX8660_L12VCR,
64 MAX8660_FPWM,
65 MAX8660_N_REGS, /* not a real register */
66};
67
68struct max8660 {
69 struct i2c_client *client;
70 u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
71};
72
73static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
74{
75 static const u8 max8660_addresses[MAX8660_N_REGS] = {
76 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80
77 };
78
79 int ret;
80 u8 reg_val = (max8660->shadow_regs[reg] & mask) | val;
81
82 dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
83 max8660_addresses[reg], reg_val);
84
85 ret = i2c_smbus_write_byte_data(max8660->client,
86 max8660_addresses[reg], reg_val);
87 if (ret == 0)
88 max8660->shadow_regs[reg] = reg_val;
89
90 return ret;
91}
92
93
94/*
95 * DCDC functions
96 */
97
98static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
99{
100 struct max8660 *max8660 = rdev_get_drvdata(rdev);
101 u8 val = max8660->shadow_regs[MAX8660_OVER1];
102 u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
103
104 return !!(val & mask);
105}
106
107static int max8660_dcdc_enable(struct regulator_dev *rdev)
108{
109 struct max8660 *max8660 = rdev_get_drvdata(rdev);
110 u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
111
112 return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
113}
114
115static int max8660_dcdc_disable(struct regulator_dev *rdev)
116{
117 struct max8660 *max8660 = rdev_get_drvdata(rdev);
118 u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
119
120 return max8660_write(max8660, MAX8660_OVER1, mask, 0);
121}
122
123static int max8660_dcdc_get_voltage_sel(struct regulator_dev *rdev)
124{
125 struct max8660 *max8660 = rdev_get_drvdata(rdev);
126 u8 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
127 u8 selector = max8660->shadow_regs[reg];
128
129 return selector;
130}
131
132static int max8660_dcdc_set_voltage_sel(struct regulator_dev *rdev,
133 unsigned int selector)
134{
135 struct max8660 *max8660 = rdev_get_drvdata(rdev);
136 u8 reg, bits;
137 int ret;
138
139 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
140 ret = max8660_write(max8660, reg, 0, selector);
141 if (ret)
142 return ret;
143
144 /* Select target voltage register and activate regulation */
145 bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
146 return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
147}
148
149static struct regulator_ops max8660_dcdc_ops = {
150 .is_enabled = max8660_dcdc_is_enabled,
151 .list_voltage = regulator_list_voltage_linear,
152 .map_voltage = regulator_map_voltage_linear,
153 .set_voltage_sel = max8660_dcdc_set_voltage_sel,
154 .get_voltage_sel = max8660_dcdc_get_voltage_sel,
155};
156
157
158/*
159 * LDO5 functions
160 */
161
162static int max8660_ldo5_get_voltage_sel(struct regulator_dev *rdev)
163{
164 struct max8660 *max8660 = rdev_get_drvdata(rdev);
165
166 u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
167 return selector;
168}
169
170static int max8660_ldo5_set_voltage_sel(struct regulator_dev *rdev,
171 unsigned int selector)
172{
173 struct max8660 *max8660 = rdev_get_drvdata(rdev);
174 int ret;
175
176 ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
177 if (ret)
178 return ret;
179
180 /* Select target voltage register and activate regulation */
181 return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
182}
183
184static const struct regulator_ops max8660_ldo5_ops = {
185 .list_voltage = regulator_list_voltage_linear,
186 .map_voltage = regulator_map_voltage_linear,
187 .set_voltage_sel = max8660_ldo5_set_voltage_sel,
188 .get_voltage_sel = max8660_ldo5_get_voltage_sel,
189};
190
191
192/*
193 * LDO67 functions
194 */
195
196static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
197{
198 struct max8660 *max8660 = rdev_get_drvdata(rdev);
199 u8 val = max8660->shadow_regs[MAX8660_OVER2];
200 u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
201
202 return !!(val & mask);
203}
204
205static int max8660_ldo67_enable(struct regulator_dev *rdev)
206{
207 struct max8660 *max8660 = rdev_get_drvdata(rdev);
208 u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
209
210 return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
211}
212
213static int max8660_ldo67_disable(struct regulator_dev *rdev)
214{
215 struct max8660 *max8660 = rdev_get_drvdata(rdev);
216 u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
217
218 return max8660_write(max8660, MAX8660_OVER2, mask, 0);
219}
220
221static int max8660_ldo67_get_voltage_sel(struct regulator_dev *rdev)
222{
223 struct max8660 *max8660 = rdev_get_drvdata(rdev);
224 u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
225 u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
226
227 return selector;
228}
229
230static int max8660_ldo67_set_voltage_sel(struct regulator_dev *rdev,
231 unsigned int selector)
232{
233 struct max8660 *max8660 = rdev_get_drvdata(rdev);
234
235 if (rdev_get_id(rdev) == MAX8660_V6)
236 return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
237 else
238 return max8660_write(max8660, MAX8660_L12VCR, 0x0f,
239 selector << 4);
240}
241
242static const struct regulator_ops max8660_ldo67_ops = {
243 .is_enabled = max8660_ldo67_is_enabled,
244 .enable = max8660_ldo67_enable,
245 .disable = max8660_ldo67_disable,
246 .list_voltage = regulator_list_voltage_linear,
247 .map_voltage = regulator_map_voltage_linear,
248 .get_voltage_sel = max8660_ldo67_get_voltage_sel,
249 .set_voltage_sel = max8660_ldo67_set_voltage_sel,
250};
251
252static const struct regulator_desc max8660_reg[] = {
253 {
254 .name = "V3(DCDC)",
255 .id = MAX8660_V3,
256 .ops = &max8660_dcdc_ops,
257 .type = REGULATOR_VOLTAGE,
258 .n_voltages = MAX8660_DCDC_MAX_SEL + 1,
259 .owner = THIS_MODULE,
260 .min_uV = MAX8660_DCDC_MIN_UV,
261 .uV_step = MAX8660_DCDC_STEP,
262 },
263 {
264 .name = "V4(DCDC)",
265 .id = MAX8660_V4,
266 .ops = &max8660_dcdc_ops,
267 .type = REGULATOR_VOLTAGE,
268 .n_voltages = MAX8660_DCDC_MAX_SEL + 1,
269 .owner = THIS_MODULE,
270 .min_uV = MAX8660_DCDC_MIN_UV,
271 .uV_step = MAX8660_DCDC_STEP,
272 },
273 {
274 .name = "V5(LDO)",
275 .id = MAX8660_V5,
276 .ops = &max8660_ldo5_ops,
277 .type = REGULATOR_VOLTAGE,
278 .n_voltages = MAX8660_LDO5_MAX_SEL + 1,
279 .owner = THIS_MODULE,
280 .min_uV = MAX8660_LDO5_MIN_UV,
281 .uV_step = MAX8660_LDO5_STEP,
282 },
283 {
284 .name = "V6(LDO)",
285 .id = MAX8660_V6,
286 .ops = &max8660_ldo67_ops,
287 .type = REGULATOR_VOLTAGE,
288 .n_voltages = MAX8660_LDO67_MAX_SEL + 1,
289 .owner = THIS_MODULE,
290 .min_uV = MAX8660_LDO67_MIN_UV,
291 .uV_step = MAX8660_LDO67_STEP,
292 },
293 {
294 .name = "V7(LDO)",
295 .id = MAX8660_V7,
296 .ops = &max8660_ldo67_ops,
297 .type = REGULATOR_VOLTAGE,
298 .n_voltages = MAX8660_LDO67_MAX_SEL + 1,
299 .owner = THIS_MODULE,
300 .min_uV = MAX8660_LDO67_MIN_UV,
301 .uV_step = MAX8660_LDO67_STEP,
302 },
303};
304
305enum {
306 MAX8660 = 0,
307 MAX8661 = 1,
308};
309
310#ifdef CONFIG_OF
311static const struct of_device_id max8660_dt_ids[] = {
312 { .compatible = "maxim,max8660", .data = (void *) MAX8660 },
313 { .compatible = "maxim,max8661", .data = (void *) MAX8661 },
314 { }
315};
316MODULE_DEVICE_TABLE(of, max8660_dt_ids);
317
318static int max8660_pdata_from_dt(struct device *dev,
319 struct device_node **of_node,
320 struct max8660_platform_data *pdata)
321{
322 int matched, i;
323 struct device_node *np;
324 struct max8660_subdev_data *sub;
325 struct of_regulator_match rmatch[ARRAY_SIZE(max8660_reg)] = { };
326
327 np = of_get_child_by_name(dev->of_node, "regulators");
328 if (!np) {
329 dev_err(dev, "missing 'regulators' subnode in DT\n");
330 return -EINVAL;
331 }
332
333 for (i = 0; i < ARRAY_SIZE(rmatch); i++)
334 rmatch[i].name = max8660_reg[i].name;
335
336 matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(rmatch));
337 of_node_put(np);
338 if (matched <= 0)
339 return matched;
340
341 pdata->subdevs = devm_kcalloc(dev,
342 matched,
343 sizeof(struct max8660_subdev_data),
344 GFP_KERNEL);
345 if (!pdata->subdevs)
346 return -ENOMEM;
347
348 pdata->num_subdevs = matched;
349 sub = pdata->subdevs;
350
351 for (i = 0; i < matched; i++) {
352 sub->id = i;
353 sub->name = rmatch[i].name;
354 sub->platform_data = rmatch[i].init_data;
355 of_node[i] = rmatch[i].of_node;
356 sub++;
357 }
358
359 return 0;
360}
361#else
362static inline int max8660_pdata_from_dt(struct device *dev,
363 struct device_node **of_node,
364 struct max8660_platform_data *pdata)
365{
366 return 0;
367}
368#endif
369
370static int max8660_probe(struct i2c_client *client,
371 const struct i2c_device_id *i2c_id)
372{
373 struct device *dev = &client->dev;
374 struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev);
375 struct regulator_config config = { };
376 struct max8660 *max8660;
377 int boot_on, i, id, ret = -EINVAL;
378 struct device_node *of_node[MAX8660_V_END];
379 unsigned long type;
380
381 if (dev->of_node && !pdata) {
382 const struct of_device_id *id;
383
384 id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
385 if (!id)
386 return -ENODEV;
387
388 ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
389 if (ret < 0)
390 return ret;
391
392 pdata = &pdata_of;
393 type = (unsigned long) id->data;
394 } else {
395 type = i2c_id->driver_data;
396 memset(of_node, 0, sizeof(of_node));
397 }
398
399 if (pdata->num_subdevs > MAX8660_V_END) {
400 dev_err(dev, "Too many regulators found!\n");
401 return -EINVAL;
402 }
403
404 max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
405 if (!max8660)
406 return -ENOMEM;
407
408 max8660->client = client;
409
410 if (pdata->en34_is_high) {
411 /* Simulate always on */
412 max8660->shadow_regs[MAX8660_OVER1] = 5;
413 } else {
414 /* Otherwise devices can be toggled via software */
415 max8660_dcdc_ops.enable = max8660_dcdc_enable;
416 max8660_dcdc_ops.disable = max8660_dcdc_disable;
417 }
418
419 /*
420 * First, set up shadow registers to prevent glitches. As some
421 * registers are shared between regulators, everything must be properly
422 * set up for all regulators in advance.
423 */
424 max8660->shadow_regs[MAX8660_ADTV1] =
425 max8660->shadow_regs[MAX8660_ADTV2] =
426 max8660->shadow_regs[MAX8660_SDTV1] =
427 max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
428 max8660->shadow_regs[MAX8660_MDTV1] =
429 max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
430
431 for (i = 0; i < pdata->num_subdevs; i++) {
432
433 if (!pdata->subdevs[i].platform_data)
434 boot_on = false;
435 else
436 boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
437
438 switch (pdata->subdevs[i].id) {
439 case MAX8660_V3:
440 if (boot_on)
441 max8660->shadow_regs[MAX8660_OVER1] |= 1;
442 break;
443
444 case MAX8660_V4:
445 if (boot_on)
446 max8660->shadow_regs[MAX8660_OVER1] |= 4;
447 break;
448
449 case MAX8660_V5:
450 break;
451
452 case MAX8660_V6:
453 if (boot_on)
454 max8660->shadow_regs[MAX8660_OVER2] |= 2;
455 break;
456
457 case MAX8660_V7:
458 if (type == MAX8661) {
459 dev_err(dev, "Regulator not on this chip!\n");
460 return -EINVAL;
461 }
462
463 if (boot_on)
464 max8660->shadow_regs[MAX8660_OVER2] |= 4;
465 break;
466
467 default:
468 dev_err(dev, "invalid regulator %s\n",
469 pdata->subdevs[i].name);
470 return ret;
471 }
472 }
473
474 /* Finally register devices */
475 for (i = 0; i < pdata->num_subdevs; i++) {
476 struct regulator_dev *rdev;
477
478 id = pdata->subdevs[i].id;
479
480 config.dev = dev;
481 config.init_data = pdata->subdevs[i].platform_data;
482 config.of_node = of_node[i];
483 config.driver_data = max8660;
484
485 rdev = devm_regulator_register(&client->dev,
486 &max8660_reg[id], &config);
487 if (IS_ERR(rdev)) {
488 dev_err(&client->dev, "failed to register %s\n",
489 max8660_reg[id].name);
490 return PTR_ERR(rdev);
491 }
492 }
493
494 i2c_set_clientdata(client, max8660);
495 return 0;
496}
497
498static const struct i2c_device_id max8660_id[] = {
499 { .name = "max8660", .driver_data = MAX8660 },
500 { .name = "max8661", .driver_data = MAX8661 },
501 { }
502};
503MODULE_DEVICE_TABLE(i2c, max8660_id);
504
505static struct i2c_driver max8660_driver = {
506 .probe = max8660_probe,
507 .driver = {
508 .name = "max8660",
509 },
510 .id_table = max8660_id,
511};
512
513static int __init max8660_init(void)
514{
515 return i2c_add_driver(&max8660_driver);
516}
517subsys_initcall(max8660_init);
518
519static void __exit max8660_exit(void)
520{
521 i2c_del_driver(&max8660_driver);
522}
523module_exit(max8660_exit);
524
525/* Module information */
526MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
527MODULE_AUTHOR("Wolfram Sang");
528MODULE_LICENSE("GPL v2");
1/*
2 * max8660.c -- Voltage regulation for the Maxim 8660/8661
3 *
4 * based on max1586.c and wm8400-regulator.c
5 *
6 * Copyright (C) 2009 Wolfram Sang, Pengutronix e.K.
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; version 2 of the License.
11 *
12 * This program is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
19 * Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 * Some info:
22 *
23 * Datasheet: http://datasheets.maxim-ic.com/en/ds/MAX8660-MAX8661.pdf
24 *
25 * This chip is a bit nasty because it is a write-only device. Thus, the driver
26 * uses shadow registers to keep track of its values. The main problem appears
27 * to be the initialization: When Linux boots up, we cannot know if the chip is
28 * in the default state or not, so we would have to pass such information in
29 * platform_data. As this adds a bit of complexity to the driver, this is left
30 * out for now until it is really needed.
31 *
32 * [A|S|M]DTV1 registers are currently not used, but [A|S|M]DTV2.
33 *
34 * If the driver is feature complete, it might be worth to check if one set of
35 * functions for V3-V7 is sufficient. For maximum flexibility during
36 * development, they are separated for now.
37 *
38 */
39
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, /* not a real register */
79};
80
81struct max8660 {
82 struct i2c_client *client;
83 u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
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 * DCDC functions
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 /* Select target voltage register and activate regulation */
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 * LDO5 functions
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 /* Select target voltage register and activate regulation */
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 * LDO67 functions
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 = 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 struct max8660_platform_data pdata_of;
395
396 id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
397 if (!id)
398 return -ENODEV;
399
400 ret = max8660_pdata_from_dt(dev, of_node, &pdata_of);
401 if (ret < 0)
402 return ret;
403
404 pdata = &pdata_of;
405 type = (unsigned long) id->data;
406 } else {
407 type = i2c_id->driver_data;
408 memset(of_node, 0, sizeof(of_node));
409 }
410
411 if (pdata->num_subdevs > MAX8660_V_END) {
412 dev_err(dev, "Too many regulators found!\n");
413 return -EINVAL;
414 }
415
416 max8660 = devm_kzalloc(dev, sizeof(struct max8660), GFP_KERNEL);
417 if (!max8660)
418 return -ENOMEM;
419
420 max8660->client = client;
421
422 if (pdata->en34_is_high) {
423 /* Simulate always on */
424 max8660->shadow_regs[MAX8660_OVER1] = 5;
425 } else {
426 /* Otherwise devices can be toggled via software */
427 max8660_dcdc_ops.enable = max8660_dcdc_enable;
428 max8660_dcdc_ops.disable = max8660_dcdc_disable;
429 }
430
431 /*
432 * First, set up shadow registers to prevent glitches. As some
433 * registers are shared between regulators, everything must be properly
434 * set up for all regulators in advance.
435 */
436 max8660->shadow_regs[MAX8660_ADTV1] =
437 max8660->shadow_regs[MAX8660_ADTV2] =
438 max8660->shadow_regs[MAX8660_SDTV1] =
439 max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
440 max8660->shadow_regs[MAX8660_MDTV1] =
441 max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
442
443 for (i = 0; i < pdata->num_subdevs; i++) {
444
445 if (!pdata->subdevs[i].platform_data)
446 return ret;
447
448 boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
449
450 switch (pdata->subdevs[i].id) {
451 case MAX8660_V3:
452 if (boot_on)
453 max8660->shadow_regs[MAX8660_OVER1] |= 1;
454 break;
455
456 case MAX8660_V4:
457 if (boot_on)
458 max8660->shadow_regs[MAX8660_OVER1] |= 4;
459 break;
460
461 case MAX8660_V5:
462 break;
463
464 case MAX8660_V6:
465 if (boot_on)
466 max8660->shadow_regs[MAX8660_OVER2] |= 2;
467 break;
468
469 case MAX8660_V7:
470 if (type == MAX8661) {
471 dev_err(dev, "Regulator not on this chip!\n");
472 return -EINVAL;
473 }
474
475 if (boot_on)
476 max8660->shadow_regs[MAX8660_OVER2] |= 4;
477 break;
478
479 default:
480 dev_err(dev, "invalid regulator %s\n",
481 pdata->subdevs[i].name);
482 return ret;
483 }
484 }
485
486 /* Finally register devices */
487 for (i = 0; i < pdata->num_subdevs; i++) {
488 struct regulator_dev *rdev;
489
490 id = pdata->subdevs[i].id;
491
492 config.dev = dev;
493 config.init_data = pdata->subdevs[i].platform_data;
494 config.of_node = of_node[i];
495 config.driver_data = max8660;
496
497 rdev = devm_regulator_register(&client->dev,
498 &max8660_reg[id], &config);
499 if (IS_ERR(rdev)) {
500 ret = PTR_ERR(rdev);
501 dev_err(&client->dev, "failed to register %s\n",
502 max8660_reg[id].name);
503 return PTR_ERR(rdev);
504 }
505 }
506
507 i2c_set_clientdata(client, max8660);
508 return 0;
509}
510
511static const struct i2c_device_id max8660_id[] = {
512 { .name = "max8660", .driver_data = MAX8660 },
513 { .name = "max8661", .driver_data = MAX8661 },
514 { }
515};
516MODULE_DEVICE_TABLE(i2c, max8660_id);
517
518static struct i2c_driver max8660_driver = {
519 .probe = max8660_probe,
520 .driver = {
521 .name = "max8660",
522 .owner = THIS_MODULE,
523 },
524 .id_table = max8660_id,
525};
526
527static int __init max8660_init(void)
528{
529 return i2c_add_driver(&max8660_driver);
530}
531subsys_initcall(max8660_init);
532
533static void __exit max8660_exit(void)
534{
535 i2c_del_driver(&max8660_driver);
536}
537module_exit(max8660_exit);
538
539/* Module information */
540MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
541MODULE_AUTHOR("Wolfram Sang");
542MODULE_LICENSE("GPL v2");