Root/drivers/regulator/tps6507x-regulator.c

1/*
2 * tps6507x-regulator.c
3 *
4 * Regulator driver for TPS65073 PMIC
5 *
6 * Copyright (C) 2009 Texas Instrument 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 kind,
13 * whether express or implied; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/err.h>
22#include <linux/platform_device.h>
23#include <linux/regulator/driver.h>
24#include <linux/regulator/machine.h>
25#include <linux/regulator/tps6507x.h>
26#include <linux/slab.h>
27#include <linux/mfd/tps6507x.h>
28
29/* DCDC's */
30#define TPS6507X_DCDC_1 0
31#define TPS6507X_DCDC_2 1
32#define TPS6507X_DCDC_3 2
33/* LDOs */
34#define TPS6507X_LDO_1 3
35#define TPS6507X_LDO_2 4
36
37#define TPS6507X_MAX_REG_ID TPS6507X_LDO_2
38
39/* Number of step-down converters available */
40#define TPS6507X_NUM_DCDC 3
41/* Number of LDO voltage regulators available */
42#define TPS6507X_NUM_LDO 2
43/* Number of total regulators available */
44#define TPS6507X_NUM_REGULATOR (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
45
46/* Supported voltage values for regulators (in microVolts) */
47static const unsigned int VDCDCx_VSEL_table[] = {
48    725000, 750000, 775000, 800000,
49    825000, 850000, 875000, 900000,
50    925000, 950000, 975000, 1000000,
51    1025000, 1050000, 1075000, 1100000,
52    1125000, 1150000, 1175000, 1200000,
53    1225000, 1250000, 1275000, 1300000,
54    1325000, 1350000, 1375000, 1400000,
55    1425000, 1450000, 1475000, 1500000,
56    1550000, 1600000, 1650000, 1700000,
57    1750000, 1800000, 1850000, 1900000,
58    1950000, 2000000, 2050000, 2100000,
59    2150000, 2200000, 2250000, 2300000,
60    2350000, 2400000, 2450000, 2500000,
61    2550000, 2600000, 2650000, 2700000,
62    2750000, 2800000, 2850000, 2900000,
63    3000000, 3100000, 3200000, 3300000,
64};
65
66static const unsigned int LDO1_VSEL_table[] = {
67    1000000, 1100000, 1200000, 1250000,
68    1300000, 1350000, 1400000, 1500000,
69    1600000, 1800000, 2500000, 2750000,
70    2800000, 3000000, 3100000, 3300000,
71};
72
73/* The voltage mapping table for LDO2 is the same as VDCDCx */
74#define LDO2_VSEL_table VDCDCx_VSEL_table
75
76struct tps_info {
77    const char *name;
78    u8 table_len;
79    const unsigned int *table;
80
81    /* Does DCDC high or the low register defines output voltage? */
82    bool defdcdc_default;
83};
84
85static struct tps_info tps6507x_pmic_regs[] = {
86    {
87        .name = "VDCDC1",
88        .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
89        .table = VDCDCx_VSEL_table,
90    },
91    {
92        .name = "VDCDC2",
93        .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
94        .table = VDCDCx_VSEL_table,
95    },
96    {
97        .name = "VDCDC3",
98        .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
99        .table = VDCDCx_VSEL_table,
100    },
101    {
102        .name = "LDO1",
103        .table_len = ARRAY_SIZE(LDO1_VSEL_table),
104        .table = LDO1_VSEL_table,
105    },
106    {
107        .name = "LDO2",
108        .table_len = ARRAY_SIZE(LDO2_VSEL_table),
109        .table = LDO2_VSEL_table,
110    },
111};
112
113struct tps6507x_pmic {
114    struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
115    struct tps6507x_dev *mfd;
116    struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
117    struct tps_info *info[TPS6507X_NUM_REGULATOR];
118    struct mutex io_lock;
119};
120static inline int tps6507x_pmic_read(struct tps6507x_pmic *tps, u8 reg)
121{
122    u8 val;
123    int err;
124
125    err = tps->mfd->read_dev(tps->mfd, reg, 1, &val);
126
127    if (err)
128        return err;
129
130    return val;
131}
132
133static inline int tps6507x_pmic_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
134{
135    return tps->mfd->write_dev(tps->mfd, reg, 1, &val);
136}
137
138static int tps6507x_pmic_set_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
139{
140    int err, data;
141
142    mutex_lock(&tps->io_lock);
143
144    data = tps6507x_pmic_read(tps, reg);
145    if (data < 0) {
146        dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
147        err = data;
148        goto out;
149    }
150
151    data |= mask;
152    err = tps6507x_pmic_write(tps, reg, data);
153    if (err)
154        dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
155
156out:
157    mutex_unlock(&tps->io_lock);
158    return err;
159}
160
161static int tps6507x_pmic_clear_bits(struct tps6507x_pmic *tps, u8 reg, u8 mask)
162{
163    int err, data;
164
165    mutex_lock(&tps->io_lock);
166
167    data = tps6507x_pmic_read(tps, reg);
168    if (data < 0) {
169        dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
170        err = data;
171        goto out;
172    }
173
174    data &= ~mask;
175    err = tps6507x_pmic_write(tps, reg, data);
176    if (err)
177        dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
178
179out:
180    mutex_unlock(&tps->io_lock);
181    return err;
182}
183
184static int tps6507x_pmic_reg_read(struct tps6507x_pmic *tps, u8 reg)
185{
186    int data;
187
188    mutex_lock(&tps->io_lock);
189
190    data = tps6507x_pmic_read(tps, reg);
191    if (data < 0)
192        dev_err(tps->mfd->dev, "Read from reg 0x%x failed\n", reg);
193
194    mutex_unlock(&tps->io_lock);
195    return data;
196}
197
198static int tps6507x_pmic_reg_write(struct tps6507x_pmic *tps, u8 reg, u8 val)
199{
200    int err;
201
202    mutex_lock(&tps->io_lock);
203
204    err = tps6507x_pmic_write(tps, reg, val);
205    if (err < 0)
206        dev_err(tps->mfd->dev, "Write for reg 0x%x failed\n", reg);
207
208    mutex_unlock(&tps->io_lock);
209    return err;
210}
211
212static int tps6507x_pmic_is_enabled(struct regulator_dev *dev)
213{
214    struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
215    int data, rid = rdev_get_id(dev);
216    u8 shift;
217
218    if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
219        return -EINVAL;
220
221    shift = TPS6507X_MAX_REG_ID - rid;
222    data = tps6507x_pmic_reg_read(tps, TPS6507X_REG_CON_CTRL1);
223
224    if (data < 0)
225        return data;
226    else
227        return (data & 1<<shift) ? 1 : 0;
228}
229
230static int tps6507x_pmic_enable(struct regulator_dev *dev)
231{
232    struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
233    int rid = rdev_get_id(dev);
234    u8 shift;
235
236    if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
237        return -EINVAL;
238
239    shift = TPS6507X_MAX_REG_ID - rid;
240    return tps6507x_pmic_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
241}
242
243static int tps6507x_pmic_disable(struct regulator_dev *dev)
244{
245    struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
246    int rid = rdev_get_id(dev);
247    u8 shift;
248
249    if (rid < TPS6507X_DCDC_1 || rid > TPS6507X_LDO_2)
250        return -EINVAL;
251
252    shift = TPS6507X_MAX_REG_ID - rid;
253    return tps6507x_pmic_clear_bits(tps, TPS6507X_REG_CON_CTRL1,
254                    1 << shift);
255}
256
257static int tps6507x_pmic_get_voltage_sel(struct regulator_dev *dev)
258{
259    struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
260    int data, rid = rdev_get_id(dev);
261    u8 reg, mask;
262
263    switch (rid) {
264    case TPS6507X_DCDC_1:
265        reg = TPS6507X_REG_DEFDCDC1;
266        mask = TPS6507X_DEFDCDCX_DCDC_MASK;
267        break;
268    case TPS6507X_DCDC_2:
269        if (tps->info[rid]->defdcdc_default)
270            reg = TPS6507X_REG_DEFDCDC2_HIGH;
271        else
272            reg = TPS6507X_REG_DEFDCDC2_LOW;
273        mask = TPS6507X_DEFDCDCX_DCDC_MASK;
274        break;
275    case TPS6507X_DCDC_3:
276        if (tps->info[rid]->defdcdc_default)
277            reg = TPS6507X_REG_DEFDCDC3_HIGH;
278        else
279            reg = TPS6507X_REG_DEFDCDC3_LOW;
280        mask = TPS6507X_DEFDCDCX_DCDC_MASK;
281        break;
282    case TPS6507X_LDO_1:
283        reg = TPS6507X_REG_LDO_CTRL1;
284        mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
285        break;
286    case TPS6507X_LDO_2:
287        reg = TPS6507X_REG_DEFLDO2;
288        mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
289        break;
290    default:
291        return -EINVAL;
292    }
293
294    data = tps6507x_pmic_reg_read(tps, reg);
295    if (data < 0)
296        return data;
297
298    data &= mask;
299    return data;
300}
301
302static int tps6507x_pmic_set_voltage_sel(struct regulator_dev *dev,
303                      unsigned selector)
304{
305    struct tps6507x_pmic *tps = rdev_get_drvdata(dev);
306    int data, rid = rdev_get_id(dev);
307    u8 reg, mask;
308
309    switch (rid) {
310    case TPS6507X_DCDC_1:
311        reg = TPS6507X_REG_DEFDCDC1;
312        mask = TPS6507X_DEFDCDCX_DCDC_MASK;
313        break;
314    case TPS6507X_DCDC_2:
315        if (tps->info[rid]->defdcdc_default)
316            reg = TPS6507X_REG_DEFDCDC2_HIGH;
317        else
318            reg = TPS6507X_REG_DEFDCDC2_LOW;
319        mask = TPS6507X_DEFDCDCX_DCDC_MASK;
320        break;
321    case TPS6507X_DCDC_3:
322        if (tps->info[rid]->defdcdc_default)
323            reg = TPS6507X_REG_DEFDCDC3_HIGH;
324        else
325            reg = TPS6507X_REG_DEFDCDC3_LOW;
326        mask = TPS6507X_DEFDCDCX_DCDC_MASK;
327        break;
328    case TPS6507X_LDO_1:
329        reg = TPS6507X_REG_LDO_CTRL1;
330        mask = TPS6507X_REG_LDO_CTRL1_LDO1_MASK;
331        break;
332    case TPS6507X_LDO_2:
333        reg = TPS6507X_REG_DEFLDO2;
334        mask = TPS6507X_REG_DEFLDO2_LDO2_MASK;
335        break;
336    default:
337        return -EINVAL;
338    }
339
340    data = tps6507x_pmic_reg_read(tps, reg);
341    if (data < 0)
342        return data;
343
344    data &= ~mask;
345    data |= selector;
346
347    return tps6507x_pmic_reg_write(tps, reg, data);
348}
349
350static struct regulator_ops tps6507x_pmic_ops = {
351    .is_enabled = tps6507x_pmic_is_enabled,
352    .enable = tps6507x_pmic_enable,
353    .disable = tps6507x_pmic_disable,
354    .get_voltage_sel = tps6507x_pmic_get_voltage_sel,
355    .set_voltage_sel = tps6507x_pmic_set_voltage_sel,
356    .list_voltage = regulator_list_voltage_table,
357};
358
359static __devinit int tps6507x_pmic_probe(struct platform_device *pdev)
360{
361    struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
362    struct tps_info *info = &tps6507x_pmic_regs[0];
363    struct regulator_config config = { };
364    struct regulator_init_data *init_data;
365    struct regulator_dev *rdev;
366    struct tps6507x_pmic *tps;
367    struct tps6507x_board *tps_board;
368    int i;
369    int error;
370
371    /**
372     * tps_board points to pmic related constants
373     * coming from the board-evm file.
374     */
375
376    tps_board = dev_get_platdata(tps6507x_dev->dev);
377    if (!tps_board)
378        return -EINVAL;
379
380    /**
381     * init_data points to array of regulator_init structures
382     * coming from the board-evm file.
383     */
384    init_data = tps_board->tps6507x_pmic_init_data;
385    if (!init_data)
386        return -EINVAL;
387
388    tps = devm_kzalloc(&pdev->dev, sizeof(*tps), GFP_KERNEL);
389    if (!tps)
390        return -ENOMEM;
391
392    mutex_init(&tps->io_lock);
393
394    /* common for all regulators */
395    tps->mfd = tps6507x_dev;
396
397    for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
398        /* Register the regulators */
399        tps->info[i] = info;
400        if (init_data->driver_data) {
401            struct tps6507x_reg_platform_data *data =
402                            init_data->driver_data;
403            tps->info[i]->defdcdc_default = data->defdcdc_default;
404        }
405
406        tps->desc[i].name = info->name;
407        tps->desc[i].id = i;
408        tps->desc[i].n_voltages = info->table_len;
409        tps->desc[i].volt_table = info->table;
410        tps->desc[i].ops = &tps6507x_pmic_ops;
411        tps->desc[i].type = REGULATOR_VOLTAGE;
412        tps->desc[i].owner = THIS_MODULE;
413
414        config.dev = tps6507x_dev->dev;
415        config.init_data = init_data;
416        config.driver_data = tps;
417
418        rdev = regulator_register(&tps->desc[i], &config);
419        if (IS_ERR(rdev)) {
420            dev_err(tps6507x_dev->dev,
421                "failed to register %s regulator\n",
422                pdev->name);
423            error = PTR_ERR(rdev);
424            goto fail;
425        }
426
427        /* Save regulator for cleanup */
428        tps->rdev[i] = rdev;
429    }
430
431    tps6507x_dev->pmic = tps;
432    platform_set_drvdata(pdev, tps6507x_dev);
433
434    return 0;
435
436fail:
437    while (--i >= 0)
438        regulator_unregister(tps->rdev[i]);
439    return error;
440}
441
442static int __devexit tps6507x_pmic_remove(struct platform_device *pdev)
443{
444    struct tps6507x_dev *tps6507x_dev = platform_get_drvdata(pdev);
445    struct tps6507x_pmic *tps = tps6507x_dev->pmic;
446    int i;
447
448    for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
449        regulator_unregister(tps->rdev[i]);
450    return 0;
451}
452
453static struct platform_driver tps6507x_pmic_driver = {
454    .driver = {
455        .name = "tps6507x-pmic",
456        .owner = THIS_MODULE,
457    },
458    .probe = tps6507x_pmic_probe,
459    .remove = __devexit_p(tps6507x_pmic_remove),
460};
461
462static int __init tps6507x_pmic_init(void)
463{
464    return platform_driver_register(&tps6507x_pmic_driver);
465}
466subsys_initcall(tps6507x_pmic_init);
467
468static void __exit tps6507x_pmic_cleanup(void)
469{
470    platform_driver_unregister(&tps6507x_pmic_driver);
471}
472module_exit(tps6507x_pmic_cleanup);
473
474MODULE_AUTHOR("Texas Instruments");
475MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
476MODULE_LICENSE("GPL v2");
477MODULE_ALIAS("platform:tps6507x-pmic");
478

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