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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
48#define MAX8660_DCDC_MIN_UV 725000
49#define MAX8660_DCDC_MAX_UV 1800000
50#define MAX8660_DCDC_STEP 25000
51#define MAX8660_DCDC_MAX_SEL 0x2b
52
53#define MAX8660_LDO5_MIN_UV 1700000
54#define MAX8660_LDO5_MAX_UV 2000000
55#define MAX8660_LDO5_STEP 25000
56#define MAX8660_LDO5_MAX_SEL 0x0c
57
58#define MAX8660_LDO67_MIN_UV 1800000
59#define MAX8660_LDO67_MAX_UV 3300000
60#define MAX8660_LDO67_STEP 100000
61#define MAX8660_LDO67_MAX_SEL 0x0f
62
63enum {
64 MAX8660_OVER1,
65 MAX8660_OVER2,
66 MAX8660_VCC1,
67 MAX8660_ADTV1,
68 MAX8660_ADTV2,
69 MAX8660_SDTV1,
70 MAX8660_SDTV2,
71 MAX8660_MDTV1,
72 MAX8660_MDTV2,
73 MAX8660_L12VCR,
74 MAX8660_FPWM,
75 MAX8660_N_REGS, /* not a real register */
76};
77
78struct max8660 {
79 struct i2c_client *client;
80 u8 shadow_regs[MAX8660_N_REGS]; /* as chip is write only */
81 struct regulator_dev *rdev[];
82};
83
84static int max8660_write(struct max8660 *max8660, u8 reg, u8 mask, u8 val)
85{
86 static const u8 max8660_addresses[MAX8660_N_REGS] =
87 { 0x10, 0x12, 0x20, 0x23, 0x24, 0x29, 0x2a, 0x32, 0x33, 0x39, 0x80 };
88
89 int ret;
90 u8 reg_val = (max8660->shadow_regs[reg] & mask) | val;
91 dev_vdbg(&max8660->client->dev, "Writing reg %02x with %02x\n",
92 max8660_addresses[reg], reg_val);
93
94 ret = i2c_smbus_write_byte_data(max8660->client,
95 max8660_addresses[reg], reg_val);
96 if (ret == 0)
97 max8660->shadow_regs[reg] = reg_val;
98
99 return ret;
100}
101
102
103/*
104 * DCDC functions
105 */
106
107static int max8660_dcdc_is_enabled(struct regulator_dev *rdev)
108{
109 struct max8660 *max8660 = rdev_get_drvdata(rdev);
110 u8 val = max8660->shadow_regs[MAX8660_OVER1];
111 u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
112 return !!(val & mask);
113}
114
115static int max8660_dcdc_enable(struct regulator_dev *rdev)
116{
117 struct max8660 *max8660 = rdev_get_drvdata(rdev);
118 u8 bit = (rdev_get_id(rdev) == MAX8660_V3) ? 1 : 4;
119 return max8660_write(max8660, MAX8660_OVER1, 0xff, bit);
120}
121
122static int max8660_dcdc_disable(struct regulator_dev *rdev)
123{
124 struct max8660 *max8660 = rdev_get_drvdata(rdev);
125 u8 mask = (rdev_get_id(rdev) == MAX8660_V3) ? ~1 : ~4;
126 return max8660_write(max8660, MAX8660_OVER1, mask, 0);
127}
128
129static int max8660_dcdc_list(struct regulator_dev *rdev, unsigned selector)
130{
131 if (selector > MAX8660_DCDC_MAX_SEL)
132 return -EINVAL;
133 return MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
134}
135
136static int max8660_dcdc_get(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 return MAX8660_DCDC_MIN_UV + selector * MAX8660_DCDC_STEP;
142}
143
144static int max8660_dcdc_set(struct regulator_dev *rdev, int min_uV, int max_uV,
145 unsigned int *s)
146{
147 struct max8660 *max8660 = rdev_get_drvdata(rdev);
148 u8 reg, selector, bits;
149 int ret;
150
151 if (min_uV < MAX8660_DCDC_MIN_UV || min_uV > MAX8660_DCDC_MAX_UV)
152 return -EINVAL;
153 if (max_uV < MAX8660_DCDC_MIN_UV || max_uV > MAX8660_DCDC_MAX_UV)
154 return -EINVAL;
155
156 selector = (min_uV - (MAX8660_DCDC_MIN_UV - MAX8660_DCDC_STEP + 1))
157 / MAX8660_DCDC_STEP;
158 *s = selector;
159
160 ret = max8660_dcdc_list(rdev, selector);
161 if (ret < 0 || ret > max_uV)
162 return -EINVAL;
163
164 reg = (rdev_get_id(rdev) == MAX8660_V3) ? MAX8660_ADTV2 : MAX8660_SDTV2;
165 ret = max8660_write(max8660, reg, 0, selector);
166 if (ret)
167 return ret;
168
169 /* Select target voltage register and activate regulation */
170 bits = (rdev_get_id(rdev) == MAX8660_V3) ? 0x03 : 0x30;
171 return max8660_write(max8660, MAX8660_VCC1, 0xff, bits);
172}
173
174static struct regulator_ops max8660_dcdc_ops = {
175 .is_enabled = max8660_dcdc_is_enabled,
176 .list_voltage = max8660_dcdc_list,
177 .set_voltage = max8660_dcdc_set,
178 .get_voltage = max8660_dcdc_get,
179};
180
181
182/*
183 * LDO5 functions
184 */
185
186static int max8660_ldo5_list(struct regulator_dev *rdev, unsigned selector)
187{
188 if (selector > MAX8660_LDO5_MAX_SEL)
189 return -EINVAL;
190 return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
191}
192
193static int max8660_ldo5_get(struct regulator_dev *rdev)
194{
195 struct max8660 *max8660 = rdev_get_drvdata(rdev);
196 u8 selector = max8660->shadow_regs[MAX8660_MDTV2];
197
198 return MAX8660_LDO5_MIN_UV + selector * MAX8660_LDO5_STEP;
199}
200
201static int max8660_ldo5_set(struct regulator_dev *rdev, int min_uV, int max_uV,
202 unsigned int *s)
203{
204 struct max8660 *max8660 = rdev_get_drvdata(rdev);
205 u8 selector;
206 int ret;
207
208 if (min_uV < MAX8660_LDO5_MIN_UV || min_uV > MAX8660_LDO5_MAX_UV)
209 return -EINVAL;
210 if (max_uV < MAX8660_LDO5_MIN_UV || max_uV > MAX8660_LDO5_MAX_UV)
211 return -EINVAL;
212
213 selector = (min_uV - (MAX8660_LDO5_MIN_UV - MAX8660_LDO5_STEP + 1))
214 / MAX8660_LDO5_STEP;
215 ret = max8660_ldo5_list(rdev, selector);
216 if (ret < 0 || ret > max_uV)
217 return -EINVAL;
218
219 *s = selector;
220
221 ret = max8660_write(max8660, MAX8660_MDTV2, 0, selector);
222 if (ret)
223 return ret;
224
225 /* Select target voltage register and activate regulation */
226 return max8660_write(max8660, MAX8660_VCC1, 0xff, 0xc0);
227}
228
229static struct regulator_ops max8660_ldo5_ops = {
230 .list_voltage = max8660_ldo5_list,
231 .set_voltage = max8660_ldo5_set,
232 .get_voltage = max8660_ldo5_get,
233};
234
235
236/*
237 * LDO67 functions
238 */
239
240static int max8660_ldo67_is_enabled(struct regulator_dev *rdev)
241{
242 struct max8660 *max8660 = rdev_get_drvdata(rdev);
243 u8 val = max8660->shadow_regs[MAX8660_OVER2];
244 u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
245 return !!(val & mask);
246}
247
248static int max8660_ldo67_enable(struct regulator_dev *rdev)
249{
250 struct max8660 *max8660 = rdev_get_drvdata(rdev);
251 u8 bit = (rdev_get_id(rdev) == MAX8660_V6) ? 2 : 4;
252 return max8660_write(max8660, MAX8660_OVER2, 0xff, bit);
253}
254
255static int max8660_ldo67_disable(struct regulator_dev *rdev)
256{
257 struct max8660 *max8660 = rdev_get_drvdata(rdev);
258 u8 mask = (rdev_get_id(rdev) == MAX8660_V6) ? ~2 : ~4;
259 return max8660_write(max8660, MAX8660_OVER2, mask, 0);
260}
261
262static int max8660_ldo67_list(struct regulator_dev *rdev, unsigned selector)
263{
264 if (selector > MAX8660_LDO67_MAX_SEL)
265 return -EINVAL;
266 return MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
267}
268
269static int max8660_ldo67_get(struct regulator_dev *rdev)
270{
271 struct max8660 *max8660 = rdev_get_drvdata(rdev);
272 u8 shift = (rdev_get_id(rdev) == MAX8660_V6) ? 0 : 4;
273 u8 selector = (max8660->shadow_regs[MAX8660_L12VCR] >> shift) & 0xf;
274
275 return MAX8660_LDO67_MIN_UV + selector * MAX8660_LDO67_STEP;
276}
277
278static int max8660_ldo67_set(struct regulator_dev *rdev, int min_uV,
279 int max_uV, unsigned int *s)
280{
281 struct max8660 *max8660 = rdev_get_drvdata(rdev);
282 u8 selector;
283 int ret;
284
285 if (min_uV < MAX8660_LDO67_MIN_UV || min_uV > MAX8660_LDO67_MAX_UV)
286 return -EINVAL;
287 if (max_uV < MAX8660_LDO67_MIN_UV || max_uV > MAX8660_LDO67_MAX_UV)
288 return -EINVAL;
289
290 selector = (min_uV - (MAX8660_LDO67_MIN_UV - MAX8660_LDO67_STEP + 1))
291 / MAX8660_LDO67_STEP;
292
293 ret = max8660_ldo67_list(rdev, selector);
294 if (ret < 0 || ret > max_uV)
295 return -EINVAL;
296
297 *s = selector;
298
299 if (rdev_get_id(rdev) == MAX8660_V6)
300 return max8660_write(max8660, MAX8660_L12VCR, 0xf0, selector);
301 else
302 return max8660_write(max8660, MAX8660_L12VCR, 0x0f, selector << 4);
303}
304
305static struct regulator_ops max8660_ldo67_ops = {
306 .is_enabled = max8660_ldo67_is_enabled,
307 .enable = max8660_ldo67_enable,
308 .disable = max8660_ldo67_disable,
309 .list_voltage = max8660_ldo67_list,
310 .get_voltage = max8660_ldo67_get,
311 .set_voltage = max8660_ldo67_set,
312};
313
314static struct regulator_desc max8660_reg[] = {
315 {
316 .name = "V3(DCDC)",
317 .id = MAX8660_V3,
318 .ops = &max8660_dcdc_ops,
319 .type = REGULATOR_VOLTAGE,
320 .n_voltages = MAX8660_DCDC_MAX_SEL + 1,
321 .owner = THIS_MODULE,
322 },
323 {
324 .name = "V4(DCDC)",
325 .id = MAX8660_V4,
326 .ops = &max8660_dcdc_ops,
327 .type = REGULATOR_VOLTAGE,
328 .n_voltages = MAX8660_DCDC_MAX_SEL + 1,
329 .owner = THIS_MODULE,
330 },
331 {
332 .name = "V5(LDO)",
333 .id = MAX8660_V5,
334 .ops = &max8660_ldo5_ops,
335 .type = REGULATOR_VOLTAGE,
336 .n_voltages = MAX8660_LDO5_MAX_SEL + 1,
337 .owner = THIS_MODULE,
338 },
339 {
340 .name = "V6(LDO)",
341 .id = MAX8660_V6,
342 .ops = &max8660_ldo67_ops,
343 .type = REGULATOR_VOLTAGE,
344 .n_voltages = MAX8660_LDO67_MAX_SEL + 1,
345 .owner = THIS_MODULE,
346 },
347 {
348 .name = "V7(LDO)",
349 .id = MAX8660_V7,
350 .ops = &max8660_ldo67_ops,
351 .type = REGULATOR_VOLTAGE,
352 .n_voltages = MAX8660_LDO67_MAX_SEL + 1,
353 .owner = THIS_MODULE,
354 },
355};
356
357static int __devinit max8660_probe(struct i2c_client *client,
358 const struct i2c_device_id *i2c_id)
359{
360 struct regulator_dev **rdev;
361 struct max8660_platform_data *pdata = client->dev.platform_data;
362 struct max8660 *max8660;
363 int boot_on, i, id, ret = -EINVAL;
364
365 if (pdata->num_subdevs > MAX8660_V_END) {
366 dev_err(&client->dev, "Too many regulators found!\n");
367 goto out;
368 }
369
370 max8660 = kzalloc(sizeof(struct max8660) +
371 sizeof(struct regulator_dev *) * MAX8660_V_END,
372 GFP_KERNEL);
373 if (!max8660) {
374 ret = -ENOMEM;
375 goto out;
376 }
377
378 max8660->client = client;
379 rdev = max8660->rdev;
380
381 if (pdata->en34_is_high) {
382 /* Simulate always on */
383 max8660->shadow_regs[MAX8660_OVER1] = 5;
384 } else {
385 /* Otherwise devices can be toggled via software */
386 max8660_dcdc_ops.enable = max8660_dcdc_enable;
387 max8660_dcdc_ops.disable = max8660_dcdc_disable;
388 }
389
390 /*
391 * First, set up shadow registers to prevent glitches. As some
392 * registers are shared between regulators, everything must be properly
393 * set up for all regulators in advance.
394 */
395 max8660->shadow_regs[MAX8660_ADTV1] =
396 max8660->shadow_regs[MAX8660_ADTV2] =
397 max8660->shadow_regs[MAX8660_SDTV1] =
398 max8660->shadow_regs[MAX8660_SDTV2] = 0x1b;
399 max8660->shadow_regs[MAX8660_MDTV1] =
400 max8660->shadow_regs[MAX8660_MDTV2] = 0x04;
401
402 for (i = 0; i < pdata->num_subdevs; i++) {
403
404 if (!pdata->subdevs[i].platform_data)
405 goto err_free;
406
407 boot_on = pdata->subdevs[i].platform_data->constraints.boot_on;
408
409 switch (pdata->subdevs[i].id) {
410 case MAX8660_V3:
411 if (boot_on)
412 max8660->shadow_regs[MAX8660_OVER1] |= 1;
413 break;
414
415 case MAX8660_V4:
416 if (boot_on)
417 max8660->shadow_regs[MAX8660_OVER1] |= 4;
418 break;
419
420 case MAX8660_V5:
421 break;
422
423 case MAX8660_V6:
424 if (boot_on)
425 max8660->shadow_regs[MAX8660_OVER2] |= 2;
426 break;
427
428 case MAX8660_V7:
429 if (!strcmp(i2c_id->name, "max8661")) {
430 dev_err(&client->dev, "Regulator not on this chip!\n");
431 goto err_free;
432 }
433
434 if (boot_on)
435 max8660->shadow_regs[MAX8660_OVER2] |= 4;
436 break;
437
438 default:
439 dev_err(&client->dev, "invalid regulator %s\n",
440 pdata->subdevs[i].name);
441 goto err_free;
442 }
443 }
444
445 /* Finally register devices */
446 for (i = 0; i < pdata->num_subdevs; i++) {
447
448 id = pdata->subdevs[i].id;
449
450 rdev[i] = regulator_register(&max8660_reg[id], &client->dev,
451 pdata->subdevs[i].platform_data,
452 max8660);
453 if (IS_ERR(rdev[i])) {
454 ret = PTR_ERR(rdev[i]);
455 dev_err(&client->dev, "failed to register %s\n",
456 max8660_reg[id].name);
457 goto err_unregister;
458 }
459 }
460
461 i2c_set_clientdata(client, max8660);
462 dev_info(&client->dev, "Maxim 8660/8661 regulator driver loaded\n");
463 return 0;
464
465err_unregister:
466 while (--i >= 0)
467 regulator_unregister(rdev[i]);
468err_free:
469 kfree(max8660);
470out:
471 return ret;
472}
473
474static int __devexit max8660_remove(struct i2c_client *client)
475{
476 struct max8660 *max8660 = i2c_get_clientdata(client);
477 int i;
478
479 for (i = 0; i < MAX8660_V_END; i++)
480 if (max8660->rdev[i])
481 regulator_unregister(max8660->rdev[i]);
482 kfree(max8660);
483
484 return 0;
485}
486
487static const struct i2c_device_id max8660_id[] = {
488 { "max8660", 0 },
489 { "max8661", 0 },
490 { }
491};
492MODULE_DEVICE_TABLE(i2c, max8660_id);
493
494static struct i2c_driver max8660_driver = {
495 .probe = max8660_probe,
496 .remove = __devexit_p(max8660_remove),
497 .driver = {
498 .name = "max8660",
499 .owner = THIS_MODULE,
500 },
501 .id_table = max8660_id,
502};
503
504static int __init max8660_init(void)
505{
506 return i2c_add_driver(&max8660_driver);
507}
508subsys_initcall(max8660_init);
509
510static void __exit max8660_exit(void)
511{
512 i2c_del_driver(&max8660_driver);
513}
514module_exit(max8660_exit);
515
516/* Module information */
517MODULE_DESCRIPTION("MAXIM 8660/8661 voltage regulator driver");
518MODULE_AUTHOR("Wolfram Sang");
519MODULE_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");