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d1a82001 LJ |
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/platform_device.h> | |
20 | #include <linux/regulator/driver.h> | |
21 | #include <linux/regulator/machine.h> | |
22 | #include <linux/mfd/abx500.h> | |
23 | #include <linux/mfd/abx500/ab8500.h> | |
24 | #include <linux/regulator/ab8500.h> | |
25 | ||
26 | /** | |
27 | * struct ab8500_ext_regulator_info - ab8500 regulator information | |
28 | * @dev: device pointer | |
29 | * @desc: regulator description | |
30 | * @rdev: regulator device | |
18bc2b39 | 31 | * @cfg: regulator configuration (extension of regulator FW configuration) |
d1a82001 LJ |
32 | * @update_bank: bank to control on/off |
33 | * @update_reg: register to control on/off | |
34 | * @update_mask: mask to enable/disable and set mode of regulator | |
35 | * @update_val: bits holding the regulator current mode | |
18bc2b39 | 36 | * @update_val_hp: bits to set EN pin active (LPn pin deactive) |
d1a82001 | 37 | * normally this means high power mode |
18bc2b39 BJ |
38 | * @update_val_lp: bits to set EN pin active and LPn pin active |
39 | * normally this means low power mode | |
40 | * @update_val_hw: bits to set regulator pins in HW control | |
41 | * SysClkReq pins and logic will choose mode | |
d1a82001 LJ |
42 | */ |
43 | struct ab8500_ext_regulator_info { | |
44 | struct device *dev; | |
45 | struct regulator_desc desc; | |
46 | struct regulator_dev *rdev; | |
18bc2b39 | 47 | struct ab8500_ext_regulator_cfg *cfg; |
d1a82001 LJ |
48 | u8 update_bank; |
49 | u8 update_reg; | |
50 | u8 update_mask; | |
51 | u8 update_val; | |
18bc2b39 BJ |
52 | u8 update_val_hp; |
53 | u8 update_val_lp; | |
54 | u8 update_val_hw; | |
d1a82001 LJ |
55 | }; |
56 | ||
7384744d | 57 | static int ab8500_ext_regulator_enable(struct regulator_dev *rdev) |
d1a82001 LJ |
58 | { |
59 | int ret; | |
7384744d AL |
60 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); |
61 | u8 regval; | |
d1a82001 | 62 | |
7384744d AL |
63 | if (info == NULL) { |
64 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
65 | return -EINVAL; | |
66 | } | |
18bc2b39 BJ |
67 | |
68 | /* | |
69 | * To satisfy both HW high power request and SW request, the regulator | |
70 | * must be on in high power. | |
71 | */ | |
72 | if (info->cfg && info->cfg->hwreq) | |
7384744d AL |
73 | regval = info->update_val_hp; |
74 | else | |
75 | regval = info->update_val; | |
d1a82001 LJ |
76 | |
77 | ret = abx500_mask_and_set_register_interruptible(info->dev, | |
78 | info->update_bank, info->update_reg, | |
7384744d | 79 | info->update_mask, regval); |
37daa8ae | 80 | if (ret < 0) { |
d1a82001 LJ |
81 | dev_err(rdev_get_dev(info->rdev), |
82 | "couldn't set enable bits for regulator\n"); | |
37daa8ae AL |
83 | return ret; |
84 | } | |
d1a82001 | 85 | |
7384744d AL |
86 | dev_dbg(rdev_get_dev(rdev), |
87 | "%s-enable (bank, reg, mask, value): 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
88 | info->desc.name, info->update_bank, info->update_reg, | |
89 | info->update_mask, regval); | |
90 | ||
91 | return 0; | |
d1a82001 LJ |
92 | } |
93 | ||
7384744d | 94 | static int ab8500_ext_regulator_disable(struct regulator_dev *rdev) |
d1a82001 LJ |
95 | { |
96 | int ret; | |
97 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
18bc2b39 | 98 | u8 regval; |
d1a82001 LJ |
99 | |
100 | if (info == NULL) { | |
101 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
102 | return -EINVAL; | |
103 | } | |
104 | ||
18bc2b39 BJ |
105 | /* |
106 | * Set the regulator in HW request mode if configured | |
107 | */ | |
108 | if (info->cfg && info->cfg->hwreq) | |
7384744d AL |
109 | regval = info->update_val_hw; |
110 | else | |
111 | regval = 0; | |
18bc2b39 | 112 | |
d1a82001 LJ |
113 | ret = abx500_mask_and_set_register_interruptible(info->dev, |
114 | info->update_bank, info->update_reg, | |
7384744d | 115 | info->update_mask, regval); |
37daa8ae | 116 | if (ret < 0) { |
d1a82001 LJ |
117 | dev_err(rdev_get_dev(info->rdev), |
118 | "couldn't set disable bits for regulator\n"); | |
37daa8ae AL |
119 | return ret; |
120 | } | |
d1a82001 | 121 | |
d1a82001 LJ |
122 | dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):" |
123 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
124 | info->desc.name, info->update_bank, info->update_reg, | |
18bc2b39 | 125 | info->update_mask, regval); |
d1a82001 | 126 | |
7384744d | 127 | return 0; |
d1a82001 LJ |
128 | } |
129 | ||
130 | static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev) | |
131 | { | |
132 | int ret; | |
133 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
134 | u8 regval; | |
135 | ||
136 | if (info == NULL) { | |
137 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
141 | ret = abx500_get_register_interruptible(info->dev, | |
142 | info->update_bank, info->update_reg, ®val); | |
143 | if (ret < 0) { | |
144 | dev_err(rdev_get_dev(rdev), | |
145 | "couldn't read 0x%x register\n", info->update_reg); | |
146 | return ret; | |
147 | } | |
148 | ||
149 | dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):" | |
150 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
151 | info->desc.name, info->update_bank, info->update_reg, | |
152 | info->update_mask, regval); | |
153 | ||
18bc2b39 BJ |
154 | if (((regval & info->update_mask) == info->update_val_lp) || |
155 | ((regval & info->update_mask) == info->update_val_hp)) | |
9ab51a0e | 156 | return 1; |
d1a82001 | 157 | else |
9ab51a0e | 158 | return 0; |
d1a82001 LJ |
159 | } |
160 | ||
161 | static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev, | |
162 | unsigned int mode) | |
163 | { | |
164 | int ret = 0; | |
165 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
66511fa4 | 166 | u8 regval; |
d1a82001 LJ |
167 | |
168 | if (info == NULL) { | |
169 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
170 | return -EINVAL; | |
171 | } | |
172 | ||
173 | switch (mode) { | |
174 | case REGULATOR_MODE_NORMAL: | |
66511fa4 | 175 | regval = info->update_val_hp; |
d1a82001 LJ |
176 | break; |
177 | case REGULATOR_MODE_IDLE: | |
66511fa4 | 178 | regval = info->update_val_lp; |
d1a82001 LJ |
179 | break; |
180 | ||
181 | default: | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
66511fa4 AL |
185 | /* If regulator is enabled and info->cfg->hwreq is set, the regulator |
186 | must be on in high power, so we don't need to write the register with | |
187 | the same value. | |
188 | */ | |
189 | if (ab8500_ext_regulator_is_enabled(rdev) && | |
190 | !(info->cfg && info->cfg->hwreq)) { | |
191 | ret = abx500_mask_and_set_register_interruptible(info->dev, | |
192 | info->update_bank, info->update_reg, | |
193 | info->update_mask, regval); | |
194 | if (ret < 0) { | |
d1a82001 LJ |
195 | dev_err(rdev_get_dev(rdev), |
196 | "Could not set regulator mode.\n"); | |
66511fa4 AL |
197 | return ret; |
198 | } | |
d1a82001 LJ |
199 | |
200 | dev_dbg(rdev_get_dev(rdev), | |
201 | "%s-set_mode (bank, reg, mask, value): " | |
202 | "0x%x, 0x%x, 0x%x, 0x%x\n", | |
203 | info->desc.name, info->update_bank, info->update_reg, | |
204 | info->update_mask, regval); | |
205 | } | |
206 | ||
66511fa4 AL |
207 | info->update_val = regval; |
208 | ||
209 | return 0; | |
d1a82001 LJ |
210 | } |
211 | ||
212 | static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev) | |
213 | { | |
214 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
215 | int ret; | |
216 | ||
217 | if (info == NULL) { | |
218 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
219 | return -EINVAL; | |
220 | } | |
221 | ||
222 | if (info->update_val == info->update_val_hp) | |
223 | ret = REGULATOR_MODE_NORMAL; | |
224 | else if (info->update_val == info->update_val_lp) | |
225 | ret = REGULATOR_MODE_IDLE; | |
226 | else | |
227 | ret = -EINVAL; | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
33fb8802 LJ |
232 | static int ab8500_ext_set_voltage(struct regulator_dev *rdev, int min_uV, |
233 | int max_uV, unsigned *selector) | |
234 | { | |
235 | struct regulation_constraints *regu_constraints = rdev->constraints; | |
236 | ||
237 | if (!regu_constraints) { | |
238 | dev_err(rdev_get_dev(rdev), "No regulator constraints\n"); | |
239 | return -EINVAL; | |
240 | } | |
241 | ||
242 | if (regu_constraints->min_uV == min_uV && | |
243 | regu_constraints->max_uV == max_uV) | |
244 | return 0; | |
245 | ||
246 | dev_err(rdev_get_dev(rdev), | |
247 | "Requested min %duV max %duV != constrained min %duV max %duV\n", | |
248 | min_uV, max_uV, | |
249 | regu_constraints->min_uV, regu_constraints->max_uV); | |
250 | ||
251 | return -EINVAL; | |
252 | } | |
253 | ||
d1a82001 LJ |
254 | static int ab8500_ext_list_voltage(struct regulator_dev *rdev, |
255 | unsigned selector) | |
256 | { | |
257 | struct regulation_constraints *regu_constraints = rdev->constraints; | |
258 | ||
259 | if (regu_constraints == NULL) { | |
260 | dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n"); | |
261 | return -EINVAL; | |
262 | } | |
263 | /* return the uV for the fixed regulators */ | |
264 | if (regu_constraints->min_uV && regu_constraints->max_uV) { | |
265 | if (regu_constraints->min_uV == regu_constraints->max_uV) | |
266 | return regu_constraints->min_uV; | |
267 | } | |
268 | return -EINVAL; | |
269 | } | |
270 | ||
271 | static struct regulator_ops ab8500_ext_regulator_ops = { | |
272 | .enable = ab8500_ext_regulator_enable, | |
273 | .disable = ab8500_ext_regulator_disable, | |
274 | .is_enabled = ab8500_ext_regulator_is_enabled, | |
275 | .set_mode = ab8500_ext_regulator_set_mode, | |
276 | .get_mode = ab8500_ext_regulator_get_mode, | |
33fb8802 | 277 | .set_voltage = ab8500_ext_set_voltage, |
d1a82001 LJ |
278 | .list_voltage = ab8500_ext_list_voltage, |
279 | }; | |
280 | ||
d1a82001 LJ |
281 | static struct ab8500_ext_regulator_info |
282 | ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = { | |
283 | [AB8500_EXT_SUPPLY1] = { | |
284 | .desc = { | |
285 | .name = "VEXTSUPPLY1", | |
286 | .ops = &ab8500_ext_regulator_ops, | |
287 | .type = REGULATOR_VOLTAGE, | |
288 | .id = AB8500_EXT_SUPPLY1, | |
289 | .owner = THIS_MODULE, | |
290 | .n_voltages = 1, | |
291 | }, | |
292 | .update_bank = 0x04, | |
293 | .update_reg = 0x08, | |
294 | .update_mask = 0x03, | |
295 | .update_val = 0x01, | |
296 | .update_val_hp = 0x01, | |
297 | .update_val_lp = 0x03, | |
298 | .update_val_hw = 0x02, | |
299 | }, | |
300 | [AB8500_EXT_SUPPLY2] = { | |
301 | .desc = { | |
302 | .name = "VEXTSUPPLY2", | |
303 | .ops = &ab8500_ext_regulator_ops, | |
304 | .type = REGULATOR_VOLTAGE, | |
305 | .id = AB8500_EXT_SUPPLY2, | |
306 | .owner = THIS_MODULE, | |
307 | .n_voltages = 1, | |
308 | }, | |
309 | .update_bank = 0x04, | |
310 | .update_reg = 0x08, | |
311 | .update_mask = 0x0c, | |
312 | .update_val = 0x04, | |
313 | .update_val_hp = 0x04, | |
314 | .update_val_lp = 0x0c, | |
315 | .update_val_hw = 0x08, | |
316 | }, | |
317 | [AB8500_EXT_SUPPLY3] = { | |
318 | .desc = { | |
319 | .name = "VEXTSUPPLY3", | |
320 | .ops = &ab8500_ext_regulator_ops, | |
321 | .type = REGULATOR_VOLTAGE, | |
322 | .id = AB8500_EXT_SUPPLY3, | |
323 | .owner = THIS_MODULE, | |
324 | .n_voltages = 1, | |
325 | }, | |
326 | .update_bank = 0x04, | |
327 | .update_reg = 0x08, | |
328 | .update_mask = 0x30, | |
329 | .update_val = 0x10, | |
18bc2b39 BJ |
330 | .update_val_hp = 0x10, |
331 | .update_val_lp = 0x30, | |
332 | .update_val_hw = 0x20, | |
d1a82001 LJ |
333 | }, |
334 | }; | |
335 | ||
5a49b4a5 | 336 | int ab8500_ext_regulator_probe(struct platform_device *pdev) |
d1a82001 LJ |
337 | { |
338 | struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); | |
339 | struct ab8500_platform_data *ppdata; | |
340 | struct ab8500_regulator_platform_data *pdata; | |
341 | struct regulator_config config = { }; | |
342 | int i, err; | |
343 | ||
344 | if (!ab8500) { | |
345 | dev_err(&pdev->dev, "null mfd parent\n"); | |
346 | return -EINVAL; | |
347 | } | |
348 | ppdata = dev_get_platdata(ab8500->dev); | |
349 | if (!ppdata) { | |
350 | dev_err(&pdev->dev, "null parent pdata\n"); | |
351 | return -EINVAL; | |
352 | } | |
353 | ||
354 | pdata = ppdata->regulator; | |
355 | if (!pdata) { | |
356 | dev_err(&pdev->dev, "null pdata\n"); | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
360 | /* make sure the platform data has the correct size */ | |
361 | if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) { | |
362 | dev_err(&pdev->dev, "Configuration error: size mismatch.\n"); | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
366 | /* check for AB8500 2.x */ | |
a6324709 | 367 | if (is_ab8500_2p0_or_earlier(ab8500)) { |
d1a82001 LJ |
368 | struct ab8500_ext_regulator_info *info; |
369 | ||
370 | /* VextSupply3LPn is inverted on AB8500 2.x */ | |
371 | info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3]; | |
372 | info->update_val = 0x30; | |
18bc2b39 BJ |
373 | info->update_val_hp = 0x30; |
374 | info->update_val_lp = 0x10; | |
d1a82001 LJ |
375 | } |
376 | ||
377 | /* register all regulators */ | |
378 | for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) { | |
379 | struct ab8500_ext_regulator_info *info = NULL; | |
380 | ||
381 | /* assign per-regulator data */ | |
382 | info = &ab8500_ext_regulator_info[i]; | |
383 | info->dev = &pdev->dev; | |
18bc2b39 BJ |
384 | info->cfg = (struct ab8500_ext_regulator_cfg *) |
385 | pdata->ext_regulator[i].driver_data; | |
d1a82001 LJ |
386 | |
387 | config.dev = &pdev->dev; | |
388 | config.init_data = &pdata->ext_regulator[i]; | |
389 | config.driver_data = info; | |
390 | ||
391 | /* register regulator with framework */ | |
392 | info->rdev = regulator_register(&info->desc, &config); | |
d1a82001 LJ |
393 | if (IS_ERR(info->rdev)) { |
394 | err = PTR_ERR(info->rdev); | |
395 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
396 | info->desc.name); | |
397 | /* when we fail, un-register all earlier regulators */ | |
398 | while (--i >= 0) { | |
399 | info = &ab8500_ext_regulator_info[i]; | |
400 | regulator_unregister(info->rdev); | |
401 | } | |
402 | return err; | |
403 | } | |
404 | ||
405 | dev_dbg(rdev_get_dev(info->rdev), | |
406 | "%s-probed\n", info->desc.name); | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
5a49b4a5 | 412 | int ab8500_ext_regulator_remove(struct platform_device *pdev) |
d1a82001 LJ |
413 | { |
414 | int i; | |
415 | ||
416 | for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) { | |
417 | struct ab8500_ext_regulator_info *info = NULL; | |
418 | info = &ab8500_ext_regulator_info[i]; | |
419 | ||
420 | dev_vdbg(rdev_get_dev(info->rdev), | |
421 | "%s-remove\n", info->desc.name); | |
422 | ||
423 | regulator_unregister(info->rdev); | |
424 | } | |
5a49b4a5 LJ |
425 | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static struct platform_driver ab8500_ext_regulator_driver = { | |
430 | .probe = ab8500_ext_regulator_probe, | |
431 | .remove = ab8500_ext_regulator_remove, | |
432 | .driver = { | |
433 | .name = "ab8500-ext-regulator", | |
434 | .owner = THIS_MODULE, | |
435 | }, | |
436 | }; | |
437 | ||
438 | static int __init ab8500_ext_regulator_init(void) | |
439 | { | |
440 | int ret; | |
441 | ||
442 | ret = platform_driver_register(&ab8500_ext_regulator_driver); | |
443 | if (ret) | |
444 | pr_err("Failed to register ab8500 ext regulator: %d\n", ret); | |
445 | ||
446 | return ret; | |
447 | } | |
448 | subsys_initcall(ab8500_ext_regulator_init); | |
449 | ||
450 | static void __exit ab8500_ext_regulator_exit(void) | |
451 | { | |
452 | platform_driver_unregister(&ab8500_ext_regulator_driver); | |
d1a82001 | 453 | } |
5a49b4a5 | 454 | module_exit(ab8500_ext_regulator_exit); |
d1a82001 LJ |
455 | |
456 | MODULE_LICENSE("GPL v2"); | |
457 | MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>"); | |
458 | MODULE_DESCRIPTION("AB8500 external regulator driver"); | |
459 | MODULE_ALIAS("platform:ab8500-ext-regulator"); |