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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 | |
31 | * @is_enabled: status of regulator (on/off) | |
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 | |
36 | * @update_val_en: bits to set EN pin active (LPn pin deactive) | |
37 | * normally this means high power mode | |
38 | * @update_val_en_lp: bits to set EN pin active and LPn pin active | |
39 | * normally this means low power mode | |
40 | * @delay: startup delay in ms | |
41 | */ | |
42 | struct ab8500_ext_regulator_info { | |
43 | struct device *dev; | |
44 | struct regulator_desc desc; | |
45 | struct regulator_dev *rdev; | |
46 | bool is_enabled; | |
47 | u8 update_bank; | |
48 | u8 update_reg; | |
49 | u8 update_mask; | |
50 | u8 update_val; | |
51 | u8 update_val_en; | |
52 | u8 update_val_en_lp; | |
53 | }; | |
54 | ||
55 | static int ab8500_ext_regulator_enable(struct regulator_dev *rdev) | |
56 | { | |
57 | int ret; | |
58 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
59 | ||
60 | if (info == NULL) { | |
61 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
62 | return -EINVAL; | |
63 | } | |
64 | ||
65 | ret = abx500_mask_and_set_register_interruptible(info->dev, | |
66 | info->update_bank, info->update_reg, | |
67 | info->update_mask, info->update_val); | |
68 | if (ret < 0) | |
69 | dev_err(rdev_get_dev(info->rdev), | |
70 | "couldn't set enable bits for regulator\n"); | |
71 | ||
72 | info->is_enabled = true; | |
73 | ||
74 | dev_dbg(rdev_get_dev(rdev), "%s-enable (bank, reg, mask, value):" | |
75 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
76 | info->desc.name, info->update_bank, info->update_reg, | |
77 | info->update_mask, info->update_val); | |
78 | ||
79 | return ret; | |
80 | } | |
81 | ||
82 | static int ab8500_ext_regulator_disable(struct regulator_dev *rdev) | |
83 | { | |
84 | int ret; | |
85 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
86 | ||
87 | if (info == NULL) { | |
88 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | ret = abx500_mask_and_set_register_interruptible(info->dev, | |
93 | info->update_bank, info->update_reg, | |
94 | info->update_mask, 0x0); | |
95 | if (ret < 0) | |
96 | dev_err(rdev_get_dev(info->rdev), | |
97 | "couldn't set disable bits for regulator\n"); | |
98 | ||
99 | info->is_enabled = false; | |
100 | ||
101 | dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):" | |
102 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
103 | info->desc.name, info->update_bank, info->update_reg, | |
104 | info->update_mask, 0x0); | |
105 | ||
106 | return ret; | |
107 | } | |
108 | ||
109 | static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev) | |
110 | { | |
111 | int ret; | |
112 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
113 | u8 regval; | |
114 | ||
115 | if (info == NULL) { | |
116 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
120 | ret = abx500_get_register_interruptible(info->dev, | |
121 | info->update_bank, info->update_reg, ®val); | |
122 | if (ret < 0) { | |
123 | dev_err(rdev_get_dev(rdev), | |
124 | "couldn't read 0x%x register\n", info->update_reg); | |
125 | return ret; | |
126 | } | |
127 | ||
128 | dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):" | |
129 | " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n", | |
130 | info->desc.name, info->update_bank, info->update_reg, | |
131 | info->update_mask, regval); | |
132 | ||
133 | if (regval & info->update_mask) | |
134 | info->is_enabled = true; | |
135 | else | |
136 | info->is_enabled = false; | |
137 | ||
138 | return info->is_enabled; | |
139 | } | |
140 | ||
141 | static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev, | |
142 | unsigned int mode) | |
143 | { | |
144 | int ret = 0; | |
145 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
146 | ||
147 | if (info == NULL) { | |
148 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
149 | return -EINVAL; | |
150 | } | |
151 | ||
152 | switch (mode) { | |
153 | case REGULATOR_MODE_NORMAL: | |
154 | info->update_val = info->update_val_hp; | |
155 | break; | |
156 | case REGULATOR_MODE_IDLE: | |
157 | info->update_val = info->update_val_lp; | |
158 | break; | |
159 | ||
160 | default: | |
161 | return -EINVAL; | |
162 | } | |
163 | ||
164 | if (info->is_enabled) { | |
165 | u8 regval; | |
166 | ||
167 | ret = enable(info, ®val); | |
168 | if (ret < 0) | |
169 | dev_err(rdev_get_dev(rdev), | |
170 | "Could not set regulator mode.\n"); | |
171 | ||
172 | dev_dbg(rdev_get_dev(rdev), | |
173 | "%s-set_mode (bank, reg, mask, value): " | |
174 | "0x%x, 0x%x, 0x%x, 0x%x\n", | |
175 | info->desc.name, info->update_bank, info->update_reg, | |
176 | info->update_mask, regval); | |
177 | } | |
178 | ||
179 | return ret; | |
180 | } | |
181 | ||
182 | static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev) | |
183 | { | |
184 | struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev); | |
185 | int ret; | |
186 | ||
187 | if (info == NULL) { | |
188 | dev_err(rdev_get_dev(rdev), "regulator info null pointer\n"); | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | if (info->update_val == info->update_val_hp) | |
193 | ret = REGULATOR_MODE_NORMAL; | |
194 | else if (info->update_val == info->update_val_lp) | |
195 | ret = REGULATOR_MODE_IDLE; | |
196 | else | |
197 | ret = -EINVAL; | |
198 | ||
199 | return ret; | |
200 | } | |
201 | ||
202 | static int ab8500_ext_fixed_get_voltage(struct regulator_dev *rdev) | |
203 | { | |
204 | struct regulation_constraints *regu_constraints = rdev->constraints; | |
205 | ||
206 | if (regu_constraints == NULL) { | |
207 | dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n"); | |
208 | return -EINVAL; | |
209 | } | |
210 | if (regu_constraints->min_uV && regu_constraints->max_uV) { | |
211 | if (regu_constraints->min_uV == regu_constraints->max_uV) | |
212 | return regu_constraints->min_uV; | |
213 | } | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | static int ab8500_ext_list_voltage(struct regulator_dev *rdev, | |
218 | unsigned selector) | |
219 | { | |
220 | struct regulation_constraints *regu_constraints = rdev->constraints; | |
221 | ||
222 | if (regu_constraints == NULL) { | |
223 | dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n"); | |
224 | return -EINVAL; | |
225 | } | |
226 | /* return the uV for the fixed regulators */ | |
227 | if (regu_constraints->min_uV && regu_constraints->max_uV) { | |
228 | if (regu_constraints->min_uV == regu_constraints->max_uV) | |
229 | return regu_constraints->min_uV; | |
230 | } | |
231 | return -EINVAL; | |
232 | } | |
233 | ||
234 | static struct regulator_ops ab8500_ext_regulator_ops = { | |
235 | .enable = ab8500_ext_regulator_enable, | |
236 | .disable = ab8500_ext_regulator_disable, | |
237 | .is_enabled = ab8500_ext_regulator_is_enabled, | |
238 | .set_mode = ab8500_ext_regulator_set_mode, | |
239 | .get_mode = ab8500_ext_regulator_get_mode, | |
240 | .get_voltage = ab8500_ext_fixed_get_voltage, | |
241 | .list_voltage = ab8500_ext_list_voltage, | |
242 | }; | |
243 | ||
244 | ||
245 | static struct ab8500_ext_regulator_info | |
246 | ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = { | |
247 | [AB8500_EXT_SUPPLY1] = { | |
248 | .desc = { | |
249 | .name = "VEXTSUPPLY1", | |
250 | .ops = &ab8500_ext_regulator_ops, | |
251 | .type = REGULATOR_VOLTAGE, | |
252 | .id = AB8500_EXT_SUPPLY1, | |
253 | .owner = THIS_MODULE, | |
254 | .n_voltages = 1, | |
255 | }, | |
256 | .update_bank = 0x04, | |
257 | .update_reg = 0x08, | |
258 | .update_mask = 0x03, | |
259 | .update_val = 0x01, | |
260 | .update_val_hp = 0x01, | |
261 | .update_val_lp = 0x03, | |
262 | .update_val_hw = 0x02, | |
263 | }, | |
264 | [AB8500_EXT_SUPPLY2] = { | |
265 | .desc = { | |
266 | .name = "VEXTSUPPLY2", | |
267 | .ops = &ab8500_ext_regulator_ops, | |
268 | .type = REGULATOR_VOLTAGE, | |
269 | .id = AB8500_EXT_SUPPLY2, | |
270 | .owner = THIS_MODULE, | |
271 | .n_voltages = 1, | |
272 | }, | |
273 | .update_bank = 0x04, | |
274 | .update_reg = 0x08, | |
275 | .update_mask = 0x0c, | |
276 | .update_val = 0x04, | |
277 | .update_val_hp = 0x04, | |
278 | .update_val_lp = 0x0c, | |
279 | .update_val_hw = 0x08, | |
280 | }, | |
281 | [AB8500_EXT_SUPPLY3] = { | |
282 | .desc = { | |
283 | .name = "VEXTSUPPLY3", | |
284 | .ops = &ab8500_ext_regulator_ops, | |
285 | .type = REGULATOR_VOLTAGE, | |
286 | .id = AB8500_EXT_SUPPLY3, | |
287 | .owner = THIS_MODULE, | |
288 | .n_voltages = 1, | |
289 | }, | |
290 | .update_bank = 0x04, | |
291 | .update_reg = 0x08, | |
292 | .update_mask = 0x30, | |
293 | .update_val = 0x10, | |
294 | .update_val_en = 0x10, | |
295 | .update_val_en_lp = 0x30, | |
296 | }, | |
297 | }; | |
298 | ||
299 | int ab8500_ext_regulator_init(struct platform_device *pdev) | |
300 | { | |
301 | struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); | |
302 | struct ab8500_platform_data *ppdata; | |
303 | struct ab8500_regulator_platform_data *pdata; | |
304 | struct regulator_config config = { }; | |
305 | int i, err; | |
306 | ||
307 | if (!ab8500) { | |
308 | dev_err(&pdev->dev, "null mfd parent\n"); | |
309 | return -EINVAL; | |
310 | } | |
311 | ppdata = dev_get_platdata(ab8500->dev); | |
312 | if (!ppdata) { | |
313 | dev_err(&pdev->dev, "null parent pdata\n"); | |
314 | return -EINVAL; | |
315 | } | |
316 | ||
317 | pdata = ppdata->regulator; | |
318 | if (!pdata) { | |
319 | dev_err(&pdev->dev, "null pdata\n"); | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | /* make sure the platform data has the correct size */ | |
324 | if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) { | |
325 | dev_err(&pdev->dev, "Configuration error: size mismatch.\n"); | |
326 | return -EINVAL; | |
327 | } | |
328 | ||
329 | /* check for AB8500 2.x */ | |
330 | if (abx500_get_chip_id(&pdev->dev) < 0x30) { | |
331 | struct ab8500_ext_regulator_info *info; | |
332 | ||
333 | /* VextSupply3LPn is inverted on AB8500 2.x */ | |
334 | info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3]; | |
335 | info->update_val = 0x30; | |
336 | info->update_val_en = 0x30; | |
337 | info->update_val_en_lp = 0x10; | |
338 | } | |
339 | ||
340 | /* register all regulators */ | |
341 | for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) { | |
342 | struct ab8500_ext_regulator_info *info = NULL; | |
343 | ||
344 | /* assign per-regulator data */ | |
345 | info = &ab8500_ext_regulator_info[i]; | |
346 | info->dev = &pdev->dev; | |
347 | ||
348 | config.dev = &pdev->dev; | |
349 | config.init_data = &pdata->ext_regulator[i]; | |
350 | config.driver_data = info; | |
351 | ||
352 | /* register regulator with framework */ | |
353 | info->rdev = regulator_register(&info->desc, &config); | |
354 | ||
355 | if (IS_ERR(info->rdev)) { | |
356 | err = PTR_ERR(info->rdev); | |
357 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
358 | info->desc.name); | |
359 | /* when we fail, un-register all earlier regulators */ | |
360 | while (--i >= 0) { | |
361 | info = &ab8500_ext_regulator_info[i]; | |
362 | regulator_unregister(info->rdev); | |
363 | } | |
364 | return err; | |
365 | } | |
366 | ||
367 | dev_dbg(rdev_get_dev(info->rdev), | |
368 | "%s-probed\n", info->desc.name); | |
369 | } | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | int ab8500_ext_regulator_exit(struct platform_device *pdev) | |
375 | { | |
376 | int i; | |
377 | ||
378 | for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) { | |
379 | struct ab8500_ext_regulator_info *info = NULL; | |
380 | info = &ab8500_ext_regulator_info[i]; | |
381 | ||
382 | dev_vdbg(rdev_get_dev(info->rdev), | |
383 | "%s-remove\n", info->desc.name); | |
384 | ||
385 | regulator_unregister(info->rdev); | |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | MODULE_LICENSE("GPL v2"); | |
392 | MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>"); | |
393 | MODULE_DESCRIPTION("AB8500 external regulator driver"); | |
394 | MODULE_ALIAS("platform:ab8500-ext-regulator"); |