Root/drivers/regulator/max77686.c

1/*
2 * max77686.c - Regulator driver for the Maxim 77686
3 *
4 * Copyright (C) 2012 Samsung Electronics
5 * Chiwoong Byun <woong.byun@smasung.com>
6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 * This driver is based on max8997.c
23 */
24
25#include <linux/kernel.h>
26#include <linux/bug.h>
27#include <linux/delay.h>
28#include <linux/err.h>
29#include <linux/gpio.h>
30#include <linux/slab.h>
31#include <linux/platform_device.h>
32#include <linux/regulator/driver.h>
33#include <linux/regulator/machine.h>
34#include <linux/regulator/of_regulator.h>
35#include <linux/mfd/max77686.h>
36#include <linux/mfd/max77686-private.h>
37
38#define MAX77686_LDO_MINUV 800000
39#define MAX77686_LDO_UVSTEP 50000
40#define MAX77686_LDO_LOW_MINUV 800000
41#define MAX77686_LDO_LOW_UVSTEP 25000
42#define MAX77686_BUCK_MINUV 750000
43#define MAX77686_BUCK_UVSTEP 50000
44#define MAX77686_RAMP_DELAY 100000 /* uV/us */
45#define MAX77686_DVS_RAMP_DELAY 27500 /* uV/us */
46#define MAX77686_DVS_MINUV 600000
47#define MAX77686_DVS_UVSTEP 12500
48
49#define MAX77686_OPMODE_SHIFT 6
50#define MAX77686_OPMODE_BUCK234_SHIFT 4
51#define MAX77686_OPMODE_MASK 0x3
52
53#define MAX77686_VSEL_MASK 0x3F
54#define MAX77686_DVS_VSEL_MASK 0xFF
55
56#define MAX77686_RAMP_RATE_MASK 0xC0
57
58#define MAX77686_REGULATORS MAX77686_REG_MAX
59#define MAX77686_LDOS 26
60
61enum max77686_ramp_rate {
62    RAMP_RATE_13P75MV,
63    RAMP_RATE_27P5MV,
64    RAMP_RATE_55MV,
65    RAMP_RATE_NO_CTRL, /* 100mV/us */
66};
67
68struct max77686_data {
69    struct regulator_dev **rdev;
70};
71
72static int max77686_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
73{
74    unsigned int ramp_value = RAMP_RATE_NO_CTRL;
75
76    switch (ramp_delay) {
77    case 1 ... 13750:
78        ramp_value = RAMP_RATE_13P75MV;
79        break;
80    case 13751 ... 27500:
81        ramp_value = RAMP_RATE_27P5MV;
82        break;
83    case 27501 ... 55000:
84        ramp_value = RAMP_RATE_55MV;
85        break;
86    case 55001 ... 100000:
87        break;
88    default:
89        pr_warn("%s: ramp_delay: %d not supported, setting 100000\n",
90            rdev->desc->name, ramp_delay);
91    }
92
93    return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
94                  MAX77686_RAMP_RATE_MASK, ramp_value << 6);
95}
96
97static struct regulator_ops max77686_ops = {
98    .list_voltage = regulator_list_voltage_linear,
99    .map_voltage = regulator_map_voltage_linear,
100    .is_enabled = regulator_is_enabled_regmap,
101    .enable = regulator_enable_regmap,
102    .disable = regulator_disable_regmap,
103    .get_voltage_sel = regulator_get_voltage_sel_regmap,
104    .set_voltage_sel = regulator_set_voltage_sel_regmap,
105    .set_voltage_time_sel = regulator_set_voltage_time_sel,
106};
107
108static struct regulator_ops max77686_buck_dvs_ops = {
109    .list_voltage = regulator_list_voltage_linear,
110    .map_voltage = regulator_map_voltage_linear,
111    .is_enabled = regulator_is_enabled_regmap,
112    .enable = regulator_enable_regmap,
113    .disable = regulator_disable_regmap,
114    .get_voltage_sel = regulator_get_voltage_sel_regmap,
115    .set_voltage_sel = regulator_set_voltage_sel_regmap,
116    .set_voltage_time_sel = regulator_set_voltage_time_sel,
117    .set_ramp_delay = max77686_set_ramp_delay,
118};
119
120#define regulator_desc_ldo(num) { \
121    .name = "LDO"#num, \
122    .id = MAX77686_LDO##num, \
123    .ops = &max77686_ops, \
124    .type = REGULATOR_VOLTAGE, \
125    .owner = THIS_MODULE, \
126    .min_uV = MAX77686_LDO_MINUV, \
127    .uV_step = MAX77686_LDO_UVSTEP, \
128    .ramp_delay = MAX77686_RAMP_DELAY, \
129    .n_voltages = MAX77686_VSEL_MASK + 1, \
130    .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
131    .vsel_mask = MAX77686_VSEL_MASK, \
132    .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
133    .enable_mask = MAX77686_OPMODE_MASK \
134            << MAX77686_OPMODE_SHIFT, \
135}
136#define regulator_desc_ldo_low(num) { \
137    .name = "LDO"#num, \
138    .id = MAX77686_LDO##num, \
139    .ops = &max77686_ops, \
140    .type = REGULATOR_VOLTAGE, \
141    .owner = THIS_MODULE, \
142    .min_uV = MAX77686_LDO_LOW_MINUV, \
143    .uV_step = MAX77686_LDO_LOW_UVSTEP, \
144    .ramp_delay = MAX77686_RAMP_DELAY, \
145    .n_voltages = MAX77686_VSEL_MASK + 1, \
146    .vsel_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
147    .vsel_mask = MAX77686_VSEL_MASK, \
148    .enable_reg = MAX77686_REG_LDO1CTRL1 + num - 1, \
149    .enable_mask = MAX77686_OPMODE_MASK \
150            << MAX77686_OPMODE_SHIFT, \
151}
152#define regulator_desc_buck(num) { \
153    .name = "BUCK"#num, \
154    .id = MAX77686_BUCK##num, \
155    .ops = &max77686_ops, \
156    .type = REGULATOR_VOLTAGE, \
157    .owner = THIS_MODULE, \
158    .min_uV = MAX77686_BUCK_MINUV, \
159    .uV_step = MAX77686_BUCK_UVSTEP, \
160    .ramp_delay = MAX77686_RAMP_DELAY, \
161    .n_voltages = MAX77686_VSEL_MASK + 1, \
162    .vsel_reg = MAX77686_REG_BUCK5OUT + (num - 5) * 2, \
163    .vsel_mask = MAX77686_VSEL_MASK, \
164    .enable_reg = MAX77686_REG_BUCK5CTRL + (num - 5) * 2, \
165    .enable_mask = MAX77686_OPMODE_MASK, \
166}
167#define regulator_desc_buck1(num) { \
168    .name = "BUCK"#num, \
169    .id = MAX77686_BUCK##num, \
170    .ops = &max77686_ops, \
171    .type = REGULATOR_VOLTAGE, \
172    .owner = THIS_MODULE, \
173    .min_uV = MAX77686_BUCK_MINUV, \
174    .uV_step = MAX77686_BUCK_UVSTEP, \
175    .ramp_delay = MAX77686_RAMP_DELAY, \
176    .n_voltages = MAX77686_VSEL_MASK + 1, \
177    .vsel_reg = MAX77686_REG_BUCK1OUT, \
178    .vsel_mask = MAX77686_VSEL_MASK, \
179    .enable_reg = MAX77686_REG_BUCK1CTRL, \
180    .enable_mask = MAX77686_OPMODE_MASK, \
181}
182#define regulator_desc_buck_dvs(num) { \
183    .name = "BUCK"#num, \
184    .id = MAX77686_BUCK##num, \
185    .ops = &max77686_buck_dvs_ops, \
186    .type = REGULATOR_VOLTAGE, \
187    .owner = THIS_MODULE, \
188    .min_uV = MAX77686_DVS_MINUV, \
189    .uV_step = MAX77686_DVS_UVSTEP, \
190    .ramp_delay = MAX77686_DVS_RAMP_DELAY, \
191    .n_voltages = MAX77686_DVS_VSEL_MASK + 1, \
192    .vsel_reg = MAX77686_REG_BUCK2DVS1 + (num - 2) * 10, \
193    .vsel_mask = MAX77686_DVS_VSEL_MASK, \
194    .enable_reg = MAX77686_REG_BUCK2CTRL1 + (num - 2) * 10, \
195    .enable_mask = MAX77686_OPMODE_MASK \
196            << MAX77686_OPMODE_BUCK234_SHIFT, \
197}
198
199static struct regulator_desc regulators[] = {
200    regulator_desc_ldo_low(1),
201    regulator_desc_ldo_low(2),
202    regulator_desc_ldo(3),
203    regulator_desc_ldo(4),
204    regulator_desc_ldo(5),
205    regulator_desc_ldo_low(6),
206    regulator_desc_ldo_low(7),
207    regulator_desc_ldo_low(8),
208    regulator_desc_ldo(9),
209    regulator_desc_ldo(10),
210    regulator_desc_ldo(11),
211    regulator_desc_ldo(12),
212    regulator_desc_ldo(13),
213    regulator_desc_ldo(14),
214    regulator_desc_ldo_low(15),
215    regulator_desc_ldo(16),
216    regulator_desc_ldo(17),
217    regulator_desc_ldo(18),
218    regulator_desc_ldo(19),
219    regulator_desc_ldo(20),
220    regulator_desc_ldo(21),
221    regulator_desc_ldo(22),
222    regulator_desc_ldo(23),
223    regulator_desc_ldo(24),
224    regulator_desc_ldo(25),
225    regulator_desc_ldo(26),
226    regulator_desc_buck1(1),
227    regulator_desc_buck_dvs(2),
228    regulator_desc_buck_dvs(3),
229    regulator_desc_buck_dvs(4),
230    regulator_desc_buck(5),
231    regulator_desc_buck(6),
232    regulator_desc_buck(7),
233    regulator_desc_buck(8),
234    regulator_desc_buck(9),
235};
236
237#ifdef CONFIG_OF
238static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev,
239                    struct max77686_platform_data *pdata)
240{
241    struct device_node *pmic_np, *regulators_np;
242    struct max77686_regulator_data *rdata;
243    struct of_regulator_match rmatch;
244    unsigned int i;
245
246    pmic_np = iodev->dev->of_node;
247    regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
248    if (!regulators_np) {
249        dev_err(iodev->dev, "could not find regulators sub-node\n");
250        return -EINVAL;
251    }
252
253    pdata->num_regulators = ARRAY_SIZE(regulators);
254    rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) *
255                 pdata->num_regulators, GFP_KERNEL);
256    if (!rdata) {
257        dev_err(iodev->dev,
258            "could not allocate memory for regulator data\n");
259        return -ENOMEM;
260    }
261
262    for (i = 0; i < pdata->num_regulators; i++) {
263        rmatch.name = regulators[i].name;
264        rmatch.init_data = NULL;
265        rmatch.of_node = NULL;
266        of_regulator_match(iodev->dev, regulators_np, &rmatch, 1);
267        rdata[i].initdata = rmatch.init_data;
268    }
269
270    pdata->regulators = rdata;
271
272    return 0;
273}
274#else
275static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev,
276                    struct max77686_platform_data *pdata)
277{
278    return 0;
279}
280#endif /* CONFIG_OF */
281
282static __devinit int max77686_pmic_probe(struct platform_device *pdev)
283{
284    struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
285    struct max77686_platform_data *pdata = dev_get_platdata(iodev->dev);
286    struct regulator_dev **rdev;
287    struct max77686_data *max77686;
288    int i, size;
289    int ret = 0;
290    struct regulator_config config = { };
291
292    dev_dbg(&pdev->dev, "%s\n", __func__);
293
294    if (!pdata) {
295        dev_err(&pdev->dev, "no platform data found for regulator\n");
296        return -ENODEV;
297    }
298
299    if (iodev->dev->of_node) {
300        ret = max77686_pmic_dt_parse_pdata(iodev, pdata);
301        if (ret)
302            return ret;
303    }
304
305    if (pdata->num_regulators != MAX77686_REGULATORS) {
306        dev_err(&pdev->dev,
307            "Invalid initial data for regulator's initialiation\n");
308        return -EINVAL;
309    }
310
311    max77686 = devm_kzalloc(&pdev->dev, sizeof(struct max77686_data),
312                GFP_KERNEL);
313    if (!max77686)
314        return -ENOMEM;
315
316    size = sizeof(struct regulator_dev *) * MAX77686_REGULATORS;
317    max77686->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
318    if (!max77686->rdev)
319        return -ENOMEM;
320
321    rdev = max77686->rdev;
322    config.dev = &pdev->dev;
323    config.regmap = iodev->regmap;
324    platform_set_drvdata(pdev, max77686);
325
326    for (i = 0; i < MAX77686_REGULATORS; i++) {
327        config.init_data = pdata->regulators[i].initdata;
328
329        rdev[i] = regulator_register(&regulators[i], &config);
330        if (IS_ERR(rdev[i])) {
331            ret = PTR_ERR(rdev[i]);
332            dev_err(&pdev->dev,
333                "regulator init failed for %d\n", i);
334                rdev[i] = NULL;
335                goto err;
336        }
337    }
338
339    return 0;
340err:
341    while (--i >= 0)
342        regulator_unregister(rdev[i]);
343    return ret;
344}
345
346static int __devexit max77686_pmic_remove(struct platform_device *pdev)
347{
348    struct max77686_data *max77686 = platform_get_drvdata(pdev);
349    struct regulator_dev **rdev = max77686->rdev;
350    int i;
351
352    for (i = 0; i < MAX77686_REGULATORS; i++)
353        if (rdev[i])
354            regulator_unregister(rdev[i]);
355
356    return 0;
357}
358
359static const struct platform_device_id max77686_pmic_id[] = {
360    {"max77686-pmic", 0},
361    { },
362};
363MODULE_DEVICE_TABLE(platform, max77686_pmic_id);
364
365static struct platform_driver max77686_pmic_driver = {
366    .driver = {
367        .name = "max77686-pmic",
368        .owner = THIS_MODULE,
369    },
370    .probe = max77686_pmic_probe,
371    .remove = __devexit_p(max77686_pmic_remove),
372    .id_table = max77686_pmic_id,
373};
374
375static int __init max77686_pmic_init(void)
376{
377    return platform_driver_register(&max77686_pmic_driver);
378}
379subsys_initcall(max77686_pmic_init);
380
381static void __exit max77686_pmic_cleanup(void)
382{
383    platform_driver_unregister(&max77686_pmic_driver);
384}
385module_exit(max77686_pmic_cleanup);
386
387MODULE_DESCRIPTION("MAXIM 77686 Regulator Driver");
388MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
389MODULE_LICENSE("GPL");
390

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