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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 | * @is_enabled: status of regulator (on/off) |
33 | * @update_bank: bank to control on/off | |
34 | * @update_reg: register to control on/off | |
35 | * @update_mask: mask to enable/disable and set mode of regulator | |
36 | * @update_val: bits holding the regulator current mode | |
18bc2b39 | 37 | * @update_val_hp: bits to set EN pin active (LPn pin deactive) |
d1a82001 | 38 | * normally this means high power mode |
18bc2b39 BJ |
39 | * @update_val_lp: bits to set EN pin active and LPn pin active |
40 | * normally this means low power mode | |
41 | * @update_val_hw: bits to set regulator pins in HW control | |
42 | * SysClkReq pins and logic will choose mode | |
d1a82001 LJ |
43 | */ |
44 | struct ab8500_ext_regulator_info { | |
45 | struct device *dev; | |
46 | struct regulator_desc desc; | |
47 | struct regulator_dev *rdev; | |
18bc2b39 | 48 | struct ab8500_ext_regulator_cfg *cfg; |
d1a82001 LJ |
49 | bool is_enabled; |
50 | u8 update_bank; | |
51 | u8 update_reg; | |
52 | u8 update_mask; | |
53 | u8 update_val; | |
18bc2b39 BJ |
54 | u8 update_val_hp; |
55 | u8 update_val_lp; | |
56 | u8 update_val_hw; | |
d1a82001 LJ |
57 | }; |
58 | ||
18bc2b39 | 59 | static int enable(struct ab8500_ext_regulator_info *info, u8 *regval) |
d1a82001 LJ |
60 | { |
61 | int ret; | |
d1a82001 | 62 | |
18bc2b39 BJ |
63 | *regval = info->update_val; |
64 | ||
65 | /* | |
66 | * To satisfy both HW high power request and SW request, the regulator | |
67 | * must be on in high power. | |
68 | */ | |
69 | if (info->cfg && info->cfg->hwreq) | |
70 | *regval = info->update_val_hp; | |
d1a82001 LJ |
71 | |
72 | ret = abx500_mask_and_set_register_interruptible(info->dev, | |
73 | info->update_bank, info->update_reg, | |
18bc2b39 | 74 | info->update_mask, *regval); |
d1a82001 LJ |
75 | if (ret < 0) |
76 | dev_err(rdev_get_dev(info->rdev), | |
77 | "couldn't set enable bits for regulator\n"); | |
78 | ||
79 | info->is_enabled = true; | |
80 | ||
d1a82001 LJ |
81 | return ret; |
82 | } | |
83 | ||
18bc2b39 | 84 | static int ab8500_ext_regulator_enable(struct regulator_dev *rdev) |
d1a82001 LJ |
85 | { |
86 | int ret; | |
87 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
18bc2b39 | 88 | u8 regval; |
d1a82001 LJ |
89 | |
90 | if (info == NULL) { | |
91 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
18bc2b39 BJ |
95 | ret = enable(info, ®val); |
96 | ||
97 | dev_dbg(rdev_get_dev(rdev), "%s-enable (bank, reg, mask, value):" | |
98 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
99 | info->desc.name, info->update_bank, info->update_reg, | |
100 | info->update_mask, regval); | |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
105 | static int disable(struct ab8500_ext_regulator_info *info, u8 *regval) | |
106 | { | |
107 | int ret; | |
108 | ||
109 | *regval = 0x0; | |
110 | ||
111 | /* | |
112 | * Set the regulator in HW request mode if configured | |
113 | */ | |
114 | if (info->cfg && info->cfg->hwreq) | |
115 | *regval = info->update_val_hw; | |
116 | ||
d1a82001 LJ |
117 | ret = abx500_mask_and_set_register_interruptible(info->dev, |
118 | info->update_bank, info->update_reg, | |
18bc2b39 | 119 | info->update_mask, *regval); |
d1a82001 LJ |
120 | if (ret < 0) |
121 | dev_err(rdev_get_dev(info->rdev), | |
122 | "couldn't set disable bits for regulator\n"); | |
123 | ||
124 | info->is_enabled = false; | |
125 | ||
18bc2b39 BJ |
126 | return ret; |
127 | } | |
128 | ||
129 | static int ab8500_ext_regulator_disable(struct regulator_dev *rdev) | |
130 | { | |
131 | int ret; | |
132 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
133 | u8 regval; | |
134 | ||
135 | if (info == NULL) { | |
136 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
137 | return -EINVAL; | |
138 | } | |
139 | ||
140 | ret = disable(info, ®val); | |
141 | ||
d1a82001 LJ |
142 | dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):" |
143 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
144 | info->desc.name, info->update_bank, info->update_reg, | |
18bc2b39 | 145 | info->update_mask, regval); |
d1a82001 LJ |
146 | |
147 | return ret; | |
148 | } | |
149 | ||
150 | static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev) | |
151 | { | |
152 | int ret; | |
153 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
154 | u8 regval; | |
155 | ||
156 | if (info == NULL) { | |
157 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
158 | return -EINVAL; | |
159 | } | |
160 | ||
161 | ret = abx500_get_register_interruptible(info->dev, | |
162 | info->update_bank, info->update_reg, ®val); | |
163 | if (ret < 0) { | |
164 | dev_err(rdev_get_dev(rdev), | |
165 | "couldn't read 0x%x register\n", info->update_reg); | |
166 | return ret; | |
167 | } | |
168 | ||
169 | dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):" | |
170 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
171 | info->desc.name, info->update_bank, info->update_reg, | |
172 | info->update_mask, regval); | |
173 | ||
18bc2b39 BJ |
174 | if (((regval & info->update_mask) == info->update_val_lp) || |
175 | ((regval & info->update_mask) == info->update_val_hp)) | |
d1a82001 LJ |
176 | info->is_enabled = true; |
177 | else | |
178 | info->is_enabled = false; | |
179 | ||
180 | return info->is_enabled; | |
181 | } | |
182 | ||
183 | static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev, | |
184 | unsigned int mode) | |
185 | { | |
186 | int ret = 0; | |
187 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
188 | ||
189 | if (info == NULL) { | |
190 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | switch (mode) { | |
195 | case REGULATOR_MODE_NORMAL: | |
196 | info->update_val = info->update_val_hp; | |
197 | break; | |
198 | case REGULATOR_MODE_IDLE: | |
199 | info->update_val = info->update_val_lp; | |
200 | break; | |
201 | ||
202 | default: | |
203 | return -EINVAL; | |
204 | } | |
205 | ||
206 | if (info->is_enabled) { | |
207 | u8 regval; | |
208 | ||
209 | ret = enable(info, ®val); | |
210 | if (ret < 0) | |
211 | dev_err(rdev_get_dev(rdev), | |
212 | "Could not set regulator mode.\n"); | |
213 | ||
214 | dev_dbg(rdev_get_dev(rdev), | |
215 | "%s-set_mode (bank, reg, mask, value): " | |
216 | "0x%x, 0x%x, 0x%x, 0x%x\n", | |
217 | info->desc.name, info->update_bank, info->update_reg, | |
218 | info->update_mask, regval); | |
219 | } | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
224 | static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev) | |
225 | { | |
226 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
227 | int ret; | |
228 | ||
229 | if (info == NULL) { | |
230 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | if (info->update_val == info->update_val_hp) | |
235 | ret = REGULATOR_MODE_NORMAL; | |
236 | else if (info->update_val == info->update_val_lp) | |
237 | ret = REGULATOR_MODE_IDLE; | |
238 | else | |
239 | ret = -EINVAL; | |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | static int ab8500_ext_fixed_get_voltage(struct regulator_dev *rdev) | |
245 | { | |
246 | struct regulation_constraints *regu_constraints = rdev->constraints; | |
247 | ||
248 | if (regu_constraints == NULL) { | |
249 | dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n"); | |
250 | return -EINVAL; | |
251 | } | |
252 | if (regu_constraints->min_uV && regu_constraints->max_uV) { | |
253 | if (regu_constraints->min_uV == regu_constraints->max_uV) | |
254 | return regu_constraints->min_uV; | |
255 | } | |
256 | return -EINVAL; | |
257 | } | |
258 | ||
259 | static int ab8500_ext_list_voltage(struct regulator_dev *rdev, | |
260 | unsigned selector) | |
261 | { | |
262 | struct regulation_constraints *regu_constraints = rdev->constraints; | |
263 | ||
264 | if (regu_constraints == NULL) { | |
265 | dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n"); | |
266 | return -EINVAL; | |
267 | } | |
268 | /* return the uV for the fixed regulators */ | |
269 | if (regu_constraints->min_uV && regu_constraints->max_uV) { | |
270 | if (regu_constraints->min_uV == regu_constraints->max_uV) | |
271 | return regu_constraints->min_uV; | |
272 | } | |
273 | return -EINVAL; | |
274 | } | |
275 | ||
276 | static struct regulator_ops ab8500_ext_regulator_ops = { | |
277 | .enable = ab8500_ext_regulator_enable, | |
278 | .disable = ab8500_ext_regulator_disable, | |
279 | .is_enabled = ab8500_ext_regulator_is_enabled, | |
280 | .set_mode = ab8500_ext_regulator_set_mode, | |
281 | .get_mode = ab8500_ext_regulator_get_mode, | |
282 | .get_voltage = ab8500_ext_fixed_get_voltage, | |
283 | .list_voltage = ab8500_ext_list_voltage, | |
284 | }; | |
285 | ||
d1a82001 LJ |
286 | static struct ab8500_ext_regulator_info |
287 | ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = { | |
288 | [AB8500_EXT_SUPPLY1] = { | |
289 | .desc = { | |
290 | .name = "VEXTSUPPLY1", | |
291 | .ops = &ab8500_ext_regulator_ops, | |
292 | .type = REGULATOR_VOLTAGE, | |
293 | .id = AB8500_EXT_SUPPLY1, | |
294 | .owner = THIS_MODULE, | |
295 | .n_voltages = 1, | |
296 | }, | |
297 | .update_bank = 0x04, | |
298 | .update_reg = 0x08, | |
299 | .update_mask = 0x03, | |
300 | .update_val = 0x01, | |
301 | .update_val_hp = 0x01, | |
302 | .update_val_lp = 0x03, | |
303 | .update_val_hw = 0x02, | |
304 | }, | |
305 | [AB8500_EXT_SUPPLY2] = { | |
306 | .desc = { | |
307 | .name = "VEXTSUPPLY2", | |
308 | .ops = &ab8500_ext_regulator_ops, | |
309 | .type = REGULATOR_VOLTAGE, | |
310 | .id = AB8500_EXT_SUPPLY2, | |
311 | .owner = THIS_MODULE, | |
312 | .n_voltages = 1, | |
313 | }, | |
314 | .update_bank = 0x04, | |
315 | .update_reg = 0x08, | |
316 | .update_mask = 0x0c, | |
317 | .update_val = 0x04, | |
318 | .update_val_hp = 0x04, | |
319 | .update_val_lp = 0x0c, | |
320 | .update_val_hw = 0x08, | |
321 | }, | |
322 | [AB8500_EXT_SUPPLY3] = { | |
323 | .desc = { | |
324 | .name = "VEXTSUPPLY3", | |
325 | .ops = &ab8500_ext_regulator_ops, | |
326 | .type = REGULATOR_VOLTAGE, | |
327 | .id = AB8500_EXT_SUPPLY3, | |
328 | .owner = THIS_MODULE, | |
329 | .n_voltages = 1, | |
330 | }, | |
331 | .update_bank = 0x04, | |
332 | .update_reg = 0x08, | |
333 | .update_mask = 0x30, | |
334 | .update_val = 0x10, | |
18bc2b39 BJ |
335 | .update_val_hp = 0x10, |
336 | .update_val_lp = 0x30, | |
337 | .update_val_hw = 0x20, | |
d1a82001 LJ |
338 | }, |
339 | }; | |
340 | ||
341 | int ab8500_ext_regulator_init(struct platform_device *pdev) | |
342 | { | |
343 | struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); | |
344 | struct ab8500_platform_data *ppdata; | |
345 | struct ab8500_regulator_platform_data *pdata; | |
346 | struct regulator_config config = { }; | |
347 | int i, err; | |
348 | ||
349 | if (!ab8500) { | |
350 | dev_err(&pdev->dev, "null mfd parent\n"); | |
351 | return -EINVAL; | |
352 | } | |
353 | ppdata = dev_get_platdata(ab8500->dev); | |
354 | if (!ppdata) { | |
355 | dev_err(&pdev->dev, "null parent pdata\n"); | |
356 | return -EINVAL; | |
357 | } | |
358 | ||
359 | pdata = ppdata->regulator; | |
360 | if (!pdata) { | |
361 | dev_err(&pdev->dev, "null pdata\n"); | |
362 | return -EINVAL; | |
363 | } | |
364 | ||
365 | /* make sure the platform data has the correct size */ | |
366 | if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) { | |
367 | dev_err(&pdev->dev, "Configuration error: size mismatch.\n"); | |
368 | return -EINVAL; | |
369 | } | |
370 | ||
371 | /* check for AB8500 2.x */ | |
a6324709 | 372 | if (is_ab8500_2p0_or_earlier(ab8500)) { |
d1a82001 LJ |
373 | struct ab8500_ext_regulator_info *info; |
374 | ||
375 | /* VextSupply3LPn is inverted on AB8500 2.x */ | |
376 | info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3]; | |
377 | info->update_val = 0x30; | |
18bc2b39 BJ |
378 | info->update_val_hp = 0x30; |
379 | info->update_val_lp = 0x10; | |
d1a82001 LJ |
380 | } |
381 | ||
382 | /* register all regulators */ | |
383 | for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) { | |
384 | struct ab8500_ext_regulator_info *info = NULL; | |
385 | ||
386 | /* assign per-regulator data */ | |
387 | info = &ab8500_ext_regulator_info[i]; | |
388 | info->dev = &pdev->dev; | |
18bc2b39 BJ |
389 | info->cfg = (struct ab8500_ext_regulator_cfg *) |
390 | pdata->ext_regulator[i].driver_data; | |
d1a82001 LJ |
391 | |
392 | config.dev = &pdev->dev; | |
393 | config.init_data = &pdata->ext_regulator[i]; | |
394 | config.driver_data = info; | |
395 | ||
396 | /* register regulator with framework */ | |
397 | info->rdev = regulator_register(&info->desc, &config); | |
398 | ||
399 | if (IS_ERR(info->rdev)) { | |
400 | err = PTR_ERR(info->rdev); | |
401 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
402 | info->desc.name); | |
403 | /* when we fail, un-register all earlier regulators */ | |
404 | while (--i >= 0) { | |
405 | info = &ab8500_ext_regulator_info[i]; | |
406 | regulator_unregister(info->rdev); | |
407 | } | |
408 | return err; | |
409 | } | |
410 | ||
411 | dev_dbg(rdev_get_dev(info->rdev), | |
412 | "%s-probed\n", info->desc.name); | |
413 | } | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | int ab8500_ext_regulator_exit(struct platform_device *pdev) | |
419 | { | |
420 | int i; | |
421 | ||
422 | for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) { | |
423 | struct ab8500_ext_regulator_info *info = NULL; | |
424 | info = &ab8500_ext_regulator_info[i]; | |
425 | ||
426 | dev_vdbg(rdev_get_dev(info->rdev), | |
427 | "%s-remove\n", info->desc.name); | |
428 | ||
429 | regulator_unregister(info->rdev); | |
430 | } | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | MODULE_LICENSE("GPL v2"); | |
436 | MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>"); | |
437 | MODULE_DESCRIPTION("AB8500 external regulator driver"); | |
438 | MODULE_ALIAS("platform:ab8500-ext-regulator"); |