1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
4 * License Terms: GNU General Public License v2
5 *
6 * Authors: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
7 *
8 * This file is based on drivers/regulator/ab8500.c
9 *
10 * AB8500 external regulators
11 *
12 * ab8500-ext supports the following regulators:
13 * - VextSupply3
14 */
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/err.h>
18#include <linux/module.h>
19#include <linux/of.h>
20#include <linux/platform_device.h>
21#include <linux/regulator/driver.h>
22#include <linux/regulator/machine.h>
23#include <linux/regulator/of_regulator.h>
24#include <linux/mfd/abx500.h>
25#include <linux/mfd/abx500/ab8500.h>
26#include <linux/regulator/ab8500.h>
27
28/**
29 * struct ab8500_ext_regulator_info - ab8500 regulator information
30 * @dev: device pointer
31 * @desc: regulator description
32 * @rdev: regulator device
33 * @cfg: regulator configuration (extension of regulator FW configuration)
34 * @update_bank: bank to control on/off
35 * @update_reg: register to control on/off
36 * @update_mask: mask to enable/disable and set mode of regulator
37 * @update_val: bits holding the regulator current mode
38 * @update_val_hp: bits to set EN pin active (LPn pin deactive)
39 *                 normally this means high power mode
40 * @update_val_lp: bits to set EN pin active and LPn pin active
41 *                 normally this means low power mode
42 * @update_val_hw: bits to set regulator pins in HW control
43 *                 SysClkReq pins and logic will choose mode
44 */
45struct ab8500_ext_regulator_info {
46	struct device *dev;
47	struct regulator_desc desc;
48	struct regulator_dev *rdev;
49	struct ab8500_ext_regulator_cfg *cfg;
50	u8 update_bank;
51	u8 update_reg;
52	u8 update_mask;
53	u8 update_val;
54	u8 update_val_hp;
55	u8 update_val_lp;
56	u8 update_val_hw;
57};
58
59static int ab8500_ext_regulator_enable(struct regulator_dev *rdev)
60{
61	int ret;
62	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
63	u8 regval;
64
65	if (info == NULL) {
66		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
67		return -EINVAL;
68	}
69
70	/*
71	 * To satisfy both HW high power request and SW request, the regulator
72	 * must be on in high power.
73	 */
74	if (info->cfg && info->cfg->hwreq)
75		regval = info->update_val_hp;
76	else
77		regval = info->update_val;
78
79	ret = abx500_mask_and_set_register_interruptible(info->dev,
80		info->update_bank, info->update_reg,
81		info->update_mask, regval);
82	if (ret < 0) {
83		dev_err(rdev_get_dev(info->rdev),
84			"couldn't set enable bits for regulator\n");
85		return ret;
86	}
87
88	dev_dbg(rdev_get_dev(rdev),
89		"%s-enable (bank, reg, mask, value): 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
90		info->desc.name, info->update_bank, info->update_reg,
91		info->update_mask, regval);
92
93	return 0;
94}
95
96static int ab8500_ext_regulator_disable(struct regulator_dev *rdev)
97{
98	int ret;
99	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
100	u8 regval;
101
102	if (info == NULL) {
103		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
104		return -EINVAL;
105	}
106
107	/*
108	 * Set the regulator in HW request mode if configured
109	 */
110	if (info->cfg && info->cfg->hwreq)
111		regval = info->update_val_hw;
112	else
113		regval = 0;
114
115	ret = abx500_mask_and_set_register_interruptible(info->dev,
116		info->update_bank, info->update_reg,
117		info->update_mask, regval);
118	if (ret < 0) {
119		dev_err(rdev_get_dev(info->rdev),
120			"couldn't set disable bits for regulator\n");
121		return ret;
122	}
123
124	dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):"
125		" 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
126		info->desc.name, info->update_bank, info->update_reg,
127		info->update_mask, regval);
128
129	return 0;
130}
131
132static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev)
133{
134	int ret;
135	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
136	u8 regval;
137
138	if (info == NULL) {
139		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
140		return -EINVAL;
141	}
142
143	ret = abx500_get_register_interruptible(info->dev,
144		info->update_bank, info->update_reg, &regval);
145	if (ret < 0) {
146		dev_err(rdev_get_dev(rdev),
147			"couldn't read 0x%x register\n", info->update_reg);
148		return ret;
149	}
150
151	dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):"
152		" 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
153		info->desc.name, info->update_bank, info->update_reg,
154		info->update_mask, regval);
155
156	if (((regval & info->update_mask) == info->update_val_lp) ||
157	    ((regval & info->update_mask) == info->update_val_hp))
158		return 1;
159	else
160		return 0;
161}
162
163static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev,
164					 unsigned int mode)
165{
166	int ret = 0;
167	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
168	u8 regval;
169
170	if (info == NULL) {
171		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
172		return -EINVAL;
173	}
174
175	switch (mode) {
176	case REGULATOR_MODE_NORMAL:
177		regval = info->update_val_hp;
178		break;
179	case REGULATOR_MODE_IDLE:
180		regval = info->update_val_lp;
181		break;
182
183	default:
184		return -EINVAL;
185	}
186
187	/* If regulator is enabled and info->cfg->hwreq is set, the regulator
188	   must be on in high power, so we don't need to write the register with
189	   the same value.
190	 */
191	if (ab8500_ext_regulator_is_enabled(rdev) &&
192	    !(info->cfg && info->cfg->hwreq)) {
193		ret = abx500_mask_and_set_register_interruptible(info->dev,
194					info->update_bank, info->update_reg,
195					info->update_mask, regval);
196		if (ret < 0) {
197			dev_err(rdev_get_dev(rdev),
198				"Could not set regulator mode.\n");
199			return ret;
200		}
201
202		dev_dbg(rdev_get_dev(rdev),
203			"%s-set_mode (bank, reg, mask, value): "
204			"0x%x, 0x%x, 0x%x, 0x%x\n",
205			info->desc.name, info->update_bank, info->update_reg,
206			info->update_mask, regval);
207	}
208
209	info->update_val = regval;
210
211	return 0;
212}
213
214static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev)
215{
216	struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
217	int ret;
218
219	if (info == NULL) {
220		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
221		return -EINVAL;
222	}
223
224	if (info->update_val == info->update_val_hp)
225		ret = REGULATOR_MODE_NORMAL;
226	else if (info->update_val == info->update_val_lp)
227		ret = REGULATOR_MODE_IDLE;
228	else
229		ret = -EINVAL;
230
231	return ret;
232}
233
234static int ab8500_ext_set_voltage(struct regulator_dev *rdev, int min_uV,
235				  int max_uV, unsigned *selector)
236{
237	struct regulation_constraints *regu_constraints = rdev->constraints;
238
239	if (!regu_constraints) {
240		dev_err(rdev_get_dev(rdev), "No regulator constraints\n");
241		return -EINVAL;
242	}
243
244	if (regu_constraints->min_uV == min_uV &&
245	    regu_constraints->max_uV == max_uV)
246		return 0;
247
248	dev_err(rdev_get_dev(rdev),
249		"Requested min %duV max %duV != constrained min %duV max %duV\n",
250		min_uV, max_uV,
251		regu_constraints->min_uV, regu_constraints->max_uV);
252
253	return -EINVAL;
254}
255
256static int ab8500_ext_list_voltage(struct regulator_dev *rdev,
257				   unsigned selector)
258{
259	struct regulation_constraints *regu_constraints = rdev->constraints;
260
261	if (regu_constraints == NULL) {
262		dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n");
263		return -EINVAL;
264	}
265	/* return the uV for the fixed regulators */
266	if (regu_constraints->min_uV && regu_constraints->max_uV) {
267		if (regu_constraints->min_uV == regu_constraints->max_uV)
268			return regu_constraints->min_uV;
269	}
270	return -EINVAL;
271}
272
273static struct regulator_ops ab8500_ext_regulator_ops = {
274	.enable			= ab8500_ext_regulator_enable,
275	.disable		= ab8500_ext_regulator_disable,
276	.is_enabled		= ab8500_ext_regulator_is_enabled,
277	.set_mode		= ab8500_ext_regulator_set_mode,
278	.get_mode		= ab8500_ext_regulator_get_mode,
279	.set_voltage		= ab8500_ext_set_voltage,
280	.list_voltage		= ab8500_ext_list_voltage,
281};
282
283static struct ab8500_ext_regulator_info
284		ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = {
285	[AB8500_EXT_SUPPLY1] = {
286		.desc = {
287			.name		= "VEXTSUPPLY1",
288			.ops		= &ab8500_ext_regulator_ops,
289			.type		= REGULATOR_VOLTAGE,
290			.id		= AB8500_EXT_SUPPLY1,
291			.owner		= THIS_MODULE,
292			.n_voltages	= 1,
293		},
294		.update_bank		= 0x04,
295		.update_reg		= 0x08,
296		.update_mask		= 0x03,
297		.update_val		= 0x01,
298		.update_val_hp		= 0x01,
299		.update_val_lp		= 0x03,
300		.update_val_hw		= 0x02,
301	},
302	[AB8500_EXT_SUPPLY2] = {
303		.desc = {
304			.name		= "VEXTSUPPLY2",
305			.ops		= &ab8500_ext_regulator_ops,
306			.type		= REGULATOR_VOLTAGE,
307			.id		= AB8500_EXT_SUPPLY2,
308			.owner		= THIS_MODULE,
309			.n_voltages	= 1,
310		},
311		.update_bank		= 0x04,
312		.update_reg		= 0x08,
313		.update_mask		= 0x0c,
314		.update_val		= 0x04,
315		.update_val_hp		= 0x04,
316		.update_val_lp		= 0x0c,
317		.update_val_hw		= 0x08,
318	},
319	[AB8500_EXT_SUPPLY3] = {
320		.desc = {
321			.name		= "VEXTSUPPLY3",
322			.ops		= &ab8500_ext_regulator_ops,
323			.type		= REGULATOR_VOLTAGE,
324			.id		= AB8500_EXT_SUPPLY3,
325			.owner		= THIS_MODULE,
326			.n_voltages	= 1,
327		},
328		.update_bank		= 0x04,
329		.update_reg		= 0x08,
330		.update_mask		= 0x30,
331		.update_val		= 0x10,
332		.update_val_hp		= 0x10,
333		.update_val_lp		= 0x30,
334		.update_val_hw		= 0x20,
335	},
336};
337
338static struct of_regulator_match ab8500_ext_regulator_match[] = {
339	{ .name = "ab8500_ext1", .driver_data = (void *) AB8500_EXT_SUPPLY1, },
340	{ .name = "ab8500_ext2", .driver_data = (void *) AB8500_EXT_SUPPLY2, },
341	{ .name = "ab8500_ext3", .driver_data = (void *) AB8500_EXT_SUPPLY3, },
342};
343
344static int ab8500_ext_regulator_probe(struct platform_device *pdev)
345{
346	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
347	struct ab8500_platform_data *ppdata;
348	struct ab8500_regulator_platform_data *pdata;
349	struct device_node *np = pdev->dev.of_node;
350	struct regulator_config config = { };
351	int i, err;
352
353	if (np) {
354		err = of_regulator_match(&pdev->dev, np,
355					 ab8500_ext_regulator_match,
356					 ARRAY_SIZE(ab8500_ext_regulator_match));
357		if (err < 0) {
358			dev_err(&pdev->dev,
359				"Error parsing regulator init data: %d\n", err);
360			return err;
361		}
362	}
363
364	if (!ab8500) {
365		dev_err(&pdev->dev, "null mfd parent\n");
366		return -EINVAL;
367	}
368
369	ppdata = dev_get_platdata(ab8500->dev);
370	if (!ppdata) {
371		dev_err(&pdev->dev, "null parent pdata\n");
372		return -EINVAL;
373	}
374
375	pdata = ppdata->regulator;
376	if (!pdata) {
377		dev_err(&pdev->dev, "null pdata\n");
378		return -EINVAL;
379	}
380
381	/* make sure the platform data has the correct size */
382	if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) {
383		dev_err(&pdev->dev, "Configuration error: size mismatch.\n");
384		return -EINVAL;
385	}
386
387	/* check for AB8500 2.x */
388	if (is_ab8500_2p0_or_earlier(ab8500)) {
389		struct ab8500_ext_regulator_info *info;
390
391		/* VextSupply3LPn is inverted on AB8500 2.x */
392		info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3];
393		info->update_val = 0x30;
394		info->update_val_hp = 0x30;
395		info->update_val_lp = 0x10;
396	}
397
398	/* register all regulators */
399	for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) {
400		struct ab8500_ext_regulator_info *info = NULL;
401
402		/* assign per-regulator data */
403		info = &ab8500_ext_regulator_info[i];
404		info->dev = &pdev->dev;
405		info->cfg = (struct ab8500_ext_regulator_cfg *)
406			pdata->ext_regulator[i].driver_data;
407
408		config.dev = &pdev->dev;
409		config.driver_data = info;
410		config.of_node = ab8500_ext_regulator_match[i].of_node;
411		config.init_data = (np) ?
412			ab8500_ext_regulator_match[i].init_data :
413			&pdata->ext_regulator[i];
414
415		/* register regulator with framework */
416		info->rdev = devm_regulator_register(&pdev->dev, &info->desc,
417						     &config);
418		if (IS_ERR(info->rdev)) {
419			err = PTR_ERR(info->rdev);
420			dev_err(&pdev->dev, "failed to register regulator %s\n",
421					info->desc.name);
422			return err;
423		}
424
425		dev_dbg(rdev_get_dev(info->rdev),
426			"%s-probed\n", info->desc.name);
427	}
428
429	return 0;
430}
431
432static struct platform_driver ab8500_ext_regulator_driver = {
433	.probe = ab8500_ext_regulator_probe,
434	.driver         = {
435		.name   = "ab8500-ext-regulator",
436	},
437};
438
439static int __init ab8500_ext_regulator_init(void)
440{
441	int ret;
442
443	ret = platform_driver_register(&ab8500_ext_regulator_driver);
444	if (ret)
445		pr_err("Failed to register ab8500 ext regulator: %d\n", ret);
446
447	return ret;
448}
449subsys_initcall(ab8500_ext_regulator_init);
450
451static void __exit ab8500_ext_regulator_exit(void)
452{
453	platform_driver_unregister(&ab8500_ext_regulator_driver);
454}
455module_exit(ab8500_ext_regulator_exit);
456
457MODULE_LICENSE("GPL v2");
458MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>");
459MODULE_DESCRIPTION("AB8500 external regulator driver");
460MODULE_ALIAS("platform:ab8500-ext-regulator");
461