Root/drivers/regulator/tps65217-regulator.c

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
54static 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
61static 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
80static 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
97static 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
114static 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
129static 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
145static 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
159static 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
172static 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
195static 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
223static 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 */
239static 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 */
250static 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
259static 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
286static 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
296static 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
329static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
330{
331    return NULL;
332}
333#endif
334
335static 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
393err_unregister_regulator:
394    while (--i >= 0)
395        regulator_unregister(tps->rdev[i]);
396
397    return ret;
398}
399
400static 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
413static 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
421static int __init tps65217_regulator_init(void)
422{
423    return platform_driver_register(&tps65217_regulator_driver);
424}
425subsys_initcall(tps65217_regulator_init);
426
427static void __exit tps65217_regulator_exit(void)
428{
429    platform_driver_unregister(&tps65217_regulator_driver);
430}
431module_exit(tps65217_regulator_exit);
432
433MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
434MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
435MODULE_ALIAS("platform:tps65217-pmic");
436MODULE_LICENSE("GPL v2");
437

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