Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
tps65217-regulator.c
Go to the documentation of this file.
1 /*
2  * tps65217-regulator.c
3  *
4  * Regulator driver for TPS65217 PMIC
5  *
6  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation version 2.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13  * kind, whether express or implied; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  */
17 
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/init.h>
22 #include <linux/err.h>
23 #include <linux/platform_device.h>
24 
25 #include <linux/regulator/of_regulator.h>
26 #include <linux/regulator/driver.h>
27 #include <linux/regulator/machine.h>
28 #include <linux/mfd/tps65217.h>
29 
30 #define TPS65217_REGULATOR(_name, _id, _ops, _n, _vr, _vm, _em, _t) \
31  { \
32  .name = _name, \
33  .id = _id, \
34  .ops = &_ops, \
35  .n_voltages = _n, \
36  .type = REGULATOR_VOLTAGE, \
37  .owner = THIS_MODULE, \
38  .vsel_reg = _vr, \
39  .vsel_mask = _vm, \
40  .enable_reg = TPS65217_REG_ENABLE, \
41  .enable_mask = _em, \
42  .volt_table = _t, \
43  } \
44 
45 #define TPS65217_INFO(_nm, _min, _max, _f1, _f2) \
46  { \
47  .name = _nm, \
48  .min_uV = _min, \
49  .max_uV = _max, \
50  .vsel_to_uv = _f1, \
51  .uv_to_vsel = _f2, \
52  }
53 
54 static const unsigned int LDO1_VSEL_table[] = {
55  1000000, 1100000, 1200000, 1250000,
56  1300000, 1350000, 1400000, 1500000,
57  1600000, 1800000, 2500000, 2750000,
58  2800000, 3000000, 3100000, 3300000,
59 };
60 
61 static int tps65217_vsel_to_uv1(unsigned int vsel)
62 {
63  int uV = 0;
64 
65  if (vsel > 63)
66  return -EINVAL;
67 
68  if (vsel <= 24)
69  uV = vsel * 25000 + 900000;
70  else if (vsel <= 52)
71  uV = (vsel - 24) * 50000 + 1500000;
72  else if (vsel < 56)
73  uV = (vsel - 52) * 100000 + 2900000;
74  else
75  uV = 3300000;
76 
77  return uV;
78 }
79 
80 static int tps65217_uv_to_vsel1(int uV, unsigned int *vsel)
81 {
82  if (uV < 0 || uV > 3300000)
83  return -EINVAL;
84 
85  if (uV <= 1500000)
86  *vsel = DIV_ROUND_UP(uV - 900000, 25000);
87  else if (uV <= 2900000)
88  *vsel = 24 + DIV_ROUND_UP(uV - 1500000, 50000);
89  else if (uV < 3300000)
90  *vsel = 52 + DIV_ROUND_UP(uV - 2900000, 100000);
91  else
92  *vsel = 56;
93 
94  return 0;
95 }
96 
97 static int tps65217_vsel_to_uv2(unsigned int vsel)
98 {
99  int uV = 0;
100 
101  if (vsel > 31)
102  return -EINVAL;
103 
104  if (vsel <= 8)
105  uV = vsel * 50000 + 1500000;
106  else if (vsel <= 13)
107  uV = (vsel - 8) * 100000 + 1900000;
108  else
109  uV = (vsel - 13) * 50000 + 2400000;
110 
111  return uV;
112 }
113 
114 static int tps65217_uv_to_vsel2(int uV, unsigned int *vsel)
115 {
116  if (uV < 0 || uV > 3300000)
117  return -EINVAL;
118 
119  if (uV <= 1900000)
120  *vsel = DIV_ROUND_UP(uV - 1500000, 50000);
121  else if (uV <= 2400000)
122  *vsel = 8 + DIV_ROUND_UP(uV - 1900000, 100000);
123  else
124  *vsel = 13 + DIV_ROUND_UP(uV - 2400000, 50000);
125 
126  return 0;
127 }
128 
129 static struct tps_info tps65217_pmic_regs[] = {
130  TPS65217_INFO("DCDC1", 900000, 1800000, tps65217_vsel_to_uv1,
131  tps65217_uv_to_vsel1),
132  TPS65217_INFO("DCDC2", 900000, 3300000, tps65217_vsel_to_uv1,
133  tps65217_uv_to_vsel1),
134  TPS65217_INFO("DCDC3", 900000, 1500000, tps65217_vsel_to_uv1,
135  tps65217_uv_to_vsel1),
136  TPS65217_INFO("LDO1", 1000000, 3300000, NULL, NULL),
137  TPS65217_INFO("LDO2", 900000, 3300000, tps65217_vsel_to_uv1,
138  tps65217_uv_to_vsel1),
139  TPS65217_INFO("LDO3", 1800000, 3300000, tps65217_vsel_to_uv2,
140  tps65217_uv_to_vsel2),
141  TPS65217_INFO("LDO4", 1800000, 3300000, tps65217_vsel_to_uv2,
142  tps65217_uv_to_vsel2),
143 };
144 
145 static int tps65217_pmic_enable(struct regulator_dev *dev)
146 {
147  struct tps65217 *tps = rdev_get_drvdata(dev);
148  unsigned int rid = rdev_get_id(dev);
149 
150  if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
151  return -EINVAL;
152 
153  /* Enable the regulator and password protection is level 1 */
154  return tps65217_set_bits(tps, TPS65217_REG_ENABLE,
155  dev->desc->enable_mask, dev->desc->enable_mask,
156  TPS65217_PROTECT_L1);
157 }
158 
159 static int tps65217_pmic_disable(struct regulator_dev *dev)
160 {
161  struct tps65217 *tps = rdev_get_drvdata(dev);
162  unsigned int rid = rdev_get_id(dev);
163 
164  if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
165  return -EINVAL;
166 
167  /* Disable the regulator and password protection is level 1 */
168  return tps65217_clear_bits(tps, TPS65217_REG_ENABLE,
169  dev->desc->enable_mask, TPS65217_PROTECT_L1);
170 }
171 
172 static int tps65217_pmic_set_voltage_sel(struct regulator_dev *dev,
173  unsigned selector)
174 {
175  int ret;
176  struct tps65217 *tps = rdev_get_drvdata(dev);
177  unsigned int rid = rdev_get_id(dev);
178 
179  /* Set the voltage based on vsel value and write protect level is 2 */
180  ret = tps65217_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
181  selector, TPS65217_PROTECT_L2);
182 
183  /* Set GO bit for DCDCx to initiate voltage transistion */
184  switch (rid) {
185  case TPS65217_DCDC_1 ... TPS65217_DCDC_3:
186  ret = tps65217_set_bits(tps, TPS65217_REG_DEFSLEW,
187  TPS65217_DEFSLEW_GO, TPS65217_DEFSLEW_GO,
188  TPS65217_PROTECT_L2);
189  break;
190  }
191 
192  return ret;
193 }
194 
195 static int tps65217_pmic_map_voltage(struct regulator_dev *dev,
196  int min_uV, int max_uV)
197 {
198 
199  struct tps65217 *tps = rdev_get_drvdata(dev);
200  unsigned int sel, rid = rdev_get_id(dev);
201  int ret;
202 
203  /* LDO1 uses regulator_map_voltage_iterate() */
204  if (rid == TPS65217_LDO_1)
205  return -EINVAL;
206 
207  if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
208  return -EINVAL;
209 
210  if (min_uV < tps->info[rid]->min_uV)
211  min_uV = tps->info[rid]->min_uV;
212 
213  if (max_uV < tps->info[rid]->min_uV || min_uV > tps->info[rid]->max_uV)
214  return -EINVAL;
215 
216  ret = tps->info[rid]->uv_to_vsel(min_uV, &sel);
217  if (ret)
218  return ret;
219 
220  return sel;
221 }
222 
223 static int tps65217_pmic_list_voltage(struct regulator_dev *dev,
224  unsigned selector)
225 {
226  struct tps65217 *tps = rdev_get_drvdata(dev);
227  unsigned int rid = rdev_get_id(dev);
228 
229  if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
230  return -EINVAL;
231 
232  if (selector >= dev->desc->n_voltages)
233  return -EINVAL;
234 
235  return tps->info[rid]->vsel_to_uv(selector);
236 }
237 
238 /* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
239 static struct regulator_ops tps65217_pmic_ops = {
240  .is_enabled = regulator_is_enabled_regmap,
241  .enable = tps65217_pmic_enable,
242  .disable = tps65217_pmic_disable,
243  .get_voltage_sel = regulator_get_voltage_sel_regmap,
244  .set_voltage_sel = tps65217_pmic_set_voltage_sel,
245  .list_voltage = tps65217_pmic_list_voltage,
246  .map_voltage = tps65217_pmic_map_voltage,
247 };
248 
249 /* Operations permitted on LDO1 */
250 static struct regulator_ops tps65217_pmic_ldo1_ops = {
251  .is_enabled = regulator_is_enabled_regmap,
252  .enable = tps65217_pmic_enable,
253  .disable = tps65217_pmic_disable,
254  .get_voltage_sel = regulator_get_voltage_sel_regmap,
255  .set_voltage_sel = tps65217_pmic_set_voltage_sel,
256  .list_voltage = regulator_list_voltage_table,
257 };
258 
259 static const struct regulator_desc regulators[] = {
260  TPS65217_REGULATOR("DCDC1", TPS65217_DCDC_1, tps65217_pmic_ops, 64,
261  TPS65217_REG_DEFDCDC1, TPS65217_DEFDCDCX_DCDC_MASK,
262  TPS65217_ENABLE_DC1_EN, NULL),
263  TPS65217_REGULATOR("DCDC2", TPS65217_DCDC_2, tps65217_pmic_ops, 64,
264  TPS65217_REG_DEFDCDC2, TPS65217_DEFDCDCX_DCDC_MASK,
265  TPS65217_ENABLE_DC2_EN, NULL),
266  TPS65217_REGULATOR("DCDC3", TPS65217_DCDC_3, tps65217_pmic_ops, 64,
267  TPS65217_REG_DEFDCDC3, TPS65217_DEFDCDCX_DCDC_MASK,
268  TPS65217_ENABLE_DC3_EN, NULL),
269  TPS65217_REGULATOR("LDO1", TPS65217_LDO_1, tps65217_pmic_ldo1_ops, 16,
270  TPS65217_REG_DEFLDO1, TPS65217_DEFLDO1_LDO1_MASK,
271  TPS65217_ENABLE_LDO1_EN, LDO1_VSEL_table),
272  TPS65217_REGULATOR("LDO2", TPS65217_LDO_2, tps65217_pmic_ops, 64,
273  TPS65217_REG_DEFLDO2, TPS65217_DEFLDO2_LDO2_MASK,
274  TPS65217_ENABLE_LDO2_EN, NULL),
275  TPS65217_REGULATOR("LDO3", TPS65217_LDO_3, tps65217_pmic_ops, 32,
276  TPS65217_REG_DEFLS1, TPS65217_DEFLDO3_LDO3_MASK,
277  TPS65217_ENABLE_LS1_EN | TPS65217_DEFLDO3_LDO3_EN,
278  NULL),
279  TPS65217_REGULATOR("LDO4", TPS65217_LDO_4, tps65217_pmic_ops, 32,
280  TPS65217_REG_DEFLS2, TPS65217_DEFLDO4_LDO4_MASK,
281  TPS65217_ENABLE_LS2_EN | TPS65217_DEFLDO4_LDO4_EN,
282  NULL),
283 };
284 
285 #ifdef CONFIG_OF
286 static struct of_regulator_match reg_matches[] = {
287  { .name = "dcdc1", .driver_data = (void *)TPS65217_DCDC_1 },
288  { .name = "dcdc2", .driver_data = (void *)TPS65217_DCDC_2 },
289  { .name = "dcdc3", .driver_data = (void *)TPS65217_DCDC_3 },
290  { .name = "ldo1", .driver_data = (void *)TPS65217_LDO_1 },
291  { .name = "ldo2", .driver_data = (void *)TPS65217_LDO_2 },
292  { .name = "ldo3", .driver_data = (void *)TPS65217_LDO_3 },
293  { .name = "ldo4", .driver_data = (void *)TPS65217_LDO_4 },
294 };
295 
296 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
297 {
298  struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
299  struct device_node *node = tps->dev->of_node;
300  struct tps65217_board *pdata;
301  struct device_node *regs;
302  int i, count;
303 
304  regs = of_find_node_by_name(node, "regulators");
305  if (!regs)
306  return NULL;
307 
308  count = of_regulator_match(pdev->dev.parent, regs,
309  reg_matches, TPS65217_NUM_REGULATOR);
310  of_node_put(regs);
311  if ((count < 0) || (count > TPS65217_NUM_REGULATOR))
312  return NULL;
313 
314  pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
315  if (!pdata)
316  return NULL;
317 
318  for (i = 0; i < count; i++) {
319  if (!reg_matches[i].init_data || !reg_matches[i].of_node)
320  continue;
321 
322  pdata->tps65217_init_data[i] = reg_matches[i].init_data;
323  pdata->of_node[i] = reg_matches[i].of_node;
324  }
325 
326  return pdata;
327 }
328 #else
329 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
330 {
331  return NULL;
332 }
333 #endif
334 
335 static int __devinit tps65217_regulator_probe(struct platform_device *pdev)
336 {
337  struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
338  struct tps65217_board *pdata = dev_get_platdata(tps->dev);
339  struct regulator_init_data *reg_data;
340  struct regulator_dev *rdev;
341  struct regulator_config config = { };
342  int i, ret;
343 
344  if (tps->dev->of_node)
345  pdata = tps65217_parse_dt(pdev);
346 
347  if (!pdata) {
348  dev_err(&pdev->dev, "Platform data not found\n");
349  return -EINVAL;
350  }
351 
352  if (tps65217_chip_id(tps) != TPS65217) {
353  dev_err(&pdev->dev, "Invalid tps chip version\n");
354  return -ENODEV;
355  }
356 
357  platform_set_drvdata(pdev, tps);
358 
359  for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
360 
361  reg_data = pdata->tps65217_init_data[i];
362 
363  /*
364  * Regulator API handles empty constraints but not NULL
365  * constraints
366  */
367  if (!reg_data)
368  continue;
369 
370  /* Register the regulators */
371  tps->info[i] = &tps65217_pmic_regs[i];
372 
373  config.dev = tps->dev;
374  config.init_data = reg_data;
375  config.driver_data = tps;
376  config.regmap = tps->regmap;
377  if (tps->dev->of_node)
378  config.of_node = pdata->of_node[i];
379 
380  rdev = regulator_register(&regulators[i], &config);
381  if (IS_ERR(rdev)) {
382  dev_err(tps->dev, "failed to register %s regulator\n",
383  pdev->name);
384  ret = PTR_ERR(rdev);
385  goto err_unregister_regulator;
386  }
387 
388  /* Save regulator for cleanup */
389  tps->rdev[i] = rdev;
390  }
391  return 0;
392 
393 err_unregister_regulator:
394  while (--i >= 0)
395  regulator_unregister(tps->rdev[i]);
396 
397  return ret;
398 }
399 
400 static int __devexit tps65217_regulator_remove(struct platform_device *pdev)
401 {
402  struct tps65217 *tps = platform_get_drvdata(pdev);
403  unsigned int i;
404 
405  for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
406  regulator_unregister(tps->rdev[i]);
407 
408  platform_set_drvdata(pdev, NULL);
409 
410  return 0;
411 }
412 
413 static struct platform_driver tps65217_regulator_driver = {
414  .driver = {
415  .name = "tps65217-pmic",
416  },
417  .probe = tps65217_regulator_probe,
418  .remove = __devexit_p(tps65217_regulator_remove),
419 };
420 
421 static int __init tps65217_regulator_init(void)
422 {
423  return platform_driver_register(&tps65217_regulator_driver);
424 }
425 subsys_initcall(tps65217_regulator_init);
426 
427 static void __exit tps65217_regulator_exit(void)
428 {
429  platform_driver_unregister(&tps65217_regulator_driver);
430 }
431 module_exit(tps65217_regulator_exit);
432 
433 MODULE_AUTHOR("AnilKumar Ch <[email protected]>");
434 MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
435 MODULE_ALIAS("platform:tps65217-pmic");
436 MODULE_LICENSE("GPL v2");
Generated on Thu Jan 10 2013 14:16:35 for Linux Kernel by   doxygen 1.8.2