regulator: regulator for Palmas Kconfig
[linux-2.6.git] / drivers / regulator / rc5t583-regulator.c
1 /*
2  * Regulator driver for RICOH RC5T583 power management chip.
3  *
4  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
5  * Author: Laxman dewangan <ldewangan@nvidia.com>
6  *
7  * based on code
8  *      Copyright (C) 2011 RICOH COMPANY,LTD
9  *
10  *
11  * This program is free software; you can redistribute it and/or modify it
12  * under the terms and conditions of the GNU General Public License,
13  * version 2, as published by the Free Software Foundation.
14  *
15  * This program is distributed in the hope it will be useful, but WITHOUT
16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
18  * more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
22  *
23  */
24
25 #include <linux/module.h>
26 #include <linux/delay.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/err.h>
30 #include <linux/platform_device.h>
31 #include <linux/regulator/driver.h>
32 #include <linux/regulator/machine.h>
33 #include <linux/gpio.h>
34 #include <linux/mfd/rc5t583.h>
35
36 struct rc5t583_regulator_info {
37         int                     deepsleep_id;
38
39         /* Regulator register address.*/
40         uint8_t                 reg_en_reg;
41         uint8_t                 en_bit;
42         uint8_t                 reg_disc_reg;
43         uint8_t                 disc_bit;
44         uint8_t                 vout_reg;
45         uint8_t                 vout_mask;
46         uint8_t                 deepsleep_reg;
47
48         /* Chip constraints on regulator behavior */
49         int                     min_uV;
50         int                     max_uV;
51         int                     step_uV;
52
53         /* Regulator specific turn-on delay  and voltage settling time*/
54         int                     enable_uv_per_us;
55         int                     change_uv_per_us;
56
57         /* Used by regulator core */
58         struct regulator_desc   desc;
59 };
60
61 struct rc5t583_regulator {
62         struct rc5t583_regulator_info *reg_info;
63
64         /* Devices */
65         struct device           *dev;
66         struct rc5t583          *mfd;
67         struct regulator_dev    *rdev;
68 };
69
70 static int rc5t583_reg_is_enabled(struct regulator_dev *rdev)
71 {
72         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
73         struct rc5t583_regulator_info *ri = reg->reg_info;
74         uint8_t control = 0;
75         int ret;
76
77         ret = rc5t583_read(reg->mfd->dev, ri->reg_en_reg, &control);
78         if (ret < 0) {
79                 dev_err(&rdev->dev,
80                         "Error in reading the control register 0x%02x\n",
81                         ri->reg_en_reg);
82                 return ret;
83         }
84         return !!(control & BIT(ri->en_bit));
85 }
86
87 static int rc5t583_reg_enable(struct regulator_dev *rdev)
88 {
89         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
90         struct rc5t583_regulator_info *ri = reg->reg_info;
91         int ret;
92
93         ret = rc5t583_set_bits(reg->mfd->dev, ri->reg_en_reg,
94                                 (1 << ri->en_bit));
95         if (ret < 0) {
96                 dev_err(&rdev->dev,
97                         "Error in setting bit of STATE register 0x%02x\n",
98                         ri->reg_en_reg);
99                 return ret;
100         }
101         return ret;
102 }
103
104 static int rc5t583_reg_disable(struct regulator_dev *rdev)
105 {
106         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
107         struct rc5t583_regulator_info *ri = reg->reg_info;
108         int ret;
109
110         ret = rc5t583_clear_bits(reg->mfd->dev, ri->reg_en_reg,
111                                 (1 << ri->en_bit));
112         if (ret < 0)
113                 dev_err(&rdev->dev,
114                         "Error in clearing bit of STATE register 0x%02x\n",
115                         ri->reg_en_reg);
116
117         return ret;
118 }
119
120 static int rc5t583_list_voltage(struct regulator_dev *rdev, unsigned selector)
121 {
122         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
123         struct rc5t583_regulator_info *ri = reg->reg_info;
124         return ri->min_uV + (ri->step_uV * selector);
125 }
126
127 static int rc5t583_set_voltage_sel(struct regulator_dev *rdev,
128                 unsigned int selector)
129 {
130         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
131         struct rc5t583_regulator_info *ri = reg->reg_info;
132         int ret;
133         if (selector >= rdev->desc->n_voltages) {
134                 dev_err(&rdev->dev, "Invalid selector 0x%02x\n", selector);
135                 return -EINVAL;
136         }
137
138         ret = rc5t583_update(reg->mfd->dev, ri->vout_reg,
139                                 selector, ri->vout_mask);
140         if (ret < 0)
141                 dev_err(&rdev->dev,
142                     "Error in update voltage register 0x%02x\n", ri->vout_reg);
143         return ret;
144 }
145
146 static int rc5t583_get_voltage_sel(struct regulator_dev *rdev)
147 {
148         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
149         struct rc5t583_regulator_info *ri = reg->reg_info;
150         uint8_t vsel = 0;
151         int ret;
152         ret = rc5t583_read(reg->mfd->dev, ri->vout_reg, &vsel);
153         if (ret < 0) {
154                 dev_err(&rdev->dev,
155                     "Error in reading voltage register 0x%02x\n", ri->vout_reg);
156                 return ret;
157         }
158         return vsel & ri->vout_mask;
159 }
160
161 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
162 {
163         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
164         int vsel = rc5t583_get_voltage_sel(rdev);
165         int curr_uV = rc5t583_list_voltage(rdev, vsel);
166         return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
167 }
168
169 static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
170                 unsigned int old_selector, unsigned int new_selector)
171 {
172         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
173         int old_uV, new_uV;
174         old_uV = rc5t583_list_voltage(rdev, old_selector);
175
176         if (old_uV < 0)
177                 return old_uV;
178
179         new_uV = rc5t583_list_voltage(rdev, new_selector);
180         if (new_uV < 0)
181                 return new_uV;
182
183         return DIV_ROUND_UP(abs(old_uV - new_uV),
184                                 reg->reg_info->change_uv_per_us);
185 }
186
187
188 static struct regulator_ops rc5t583_ops = {
189         .is_enabled             = rc5t583_reg_is_enabled,
190         .enable                 = rc5t583_reg_enable,
191         .disable                = rc5t583_reg_disable,
192         .enable_time            = rc5t583_regulator_enable_time,
193         .get_voltage_sel        = rc5t583_get_voltage_sel,
194         .set_voltage_sel        = rc5t583_set_voltage_sel,
195         .list_voltage           = rc5t583_list_voltage,
196         .set_voltage_time_sel   = rc5t583_set_voltage_time_sel,
197 };
198
199 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, _vout_reg,  \
200                 _vout_mask, _ds_reg, _min_mv, _max_mv, _step_uV, _enable_mv) \
201 {                                                               \
202         .reg_en_reg     = RC5T583_REG_##_en_reg,                \
203         .en_bit         = _en_bit,                              \
204         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
205         .disc_bit       = _disc_bit,                            \
206         .vout_reg       = RC5T583_REG_##_vout_reg,              \
207         .vout_mask      = _vout_mask,                           \
208         .deepsleep_reg  = RC5T583_REG_##_ds_reg,                \
209         .min_uV         = _min_mv * 1000,                       \
210         .max_uV         = _max_mv * 1000,                       \
211         .step_uV        = _step_uV,                             \
212         .enable_uv_per_us = _enable_mv * 1000,                  \
213         .change_uv_per_us = 40 * 1000,                          \
214         .deepsleep_id   = RC5T583_DS_##_id,                     \
215         .desc = {                                               \
216                 .name = "rc5t583-regulator-"#_id,               \
217                 .id = RC5T583_REGULATOR_##_id,                  \
218                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
219                 .ops = &rc5t583_ops,                            \
220                 .type = REGULATOR_VOLTAGE,                      \
221                 .owner = THIS_MODULE,                           \
222         },                                                      \
223 }
224
225 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
226         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, DC0DAC, 0x7F, DC0DAC_DS,
227                         700, 1500, 12500, 4),
228         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, DC1DAC, 0x7F, DC1DAC_DS,
229                         700, 1500, 12500, 14),
230         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, DC2DAC, 0x7F, DC2DAC_DS,
231                         900, 2400, 12500, 14),
232         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, DC3DAC, 0x7F, DC3DAC_DS,
233                         900, 2400, 12500, 14),
234         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, LDO0DAC, 0x7F, LDO0DAC_DS,
235                         900, 3400, 25000, 160),
236         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, LDO1DAC, 0x7F, LDO1DAC_DS,
237                         900, 3400, 25000, 160),
238         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, LDO2DAC, 0x7F, LDO2DAC_DS,
239                         900, 3400, 25000, 160),
240         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, LDO3DAC, 0x7F, LDO3DAC_DS,
241                         900, 3400, 25000, 160),
242         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, LDO4DAC, 0x3F, LDO4DAC_DS,
243                         750, 1500, 12500, 133),
244         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, LDO5DAC, 0x7F, LDO5DAC_DS,
245                         900, 3400, 25000, 267),
246         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, LDO6DAC, 0x7F, LDO6DAC_DS,
247                         900, 3400, 25000, 133),
248         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, LDO7DAC, 0x7F, LDO7DAC_DS,
249                         900, 3400, 25000, 233),
250         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, LDO8DAC, 0x7F, LDO8DAC_DS,
251                         900, 3400, 25000, 233),
252         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, LDO9DAC, 0x7F, LDO9DAC_DS,
253                         900, 3400, 25000, 133),
254 };
255
256 static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
257 {
258         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
259         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
260         struct regulator_init_data *reg_data;
261         struct rc5t583_regulator *reg = NULL;
262         struct rc5t583_regulator *regs;
263         struct regulator_dev *rdev;
264         struct rc5t583_regulator_info *ri;
265         int ret;
266         int id;
267
268         if (!pdata) {
269                 dev_err(&pdev->dev, "No platform data, exiting...\n");
270                 return -ENODEV;
271         }
272
273         regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
274                         sizeof(struct rc5t583_regulator), GFP_KERNEL);
275         if (!regs) {
276                 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
277                 return -ENOMEM;
278         }
279
280
281         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
282                 reg_data = pdata->reg_init_data[id];
283
284                 /* No need to register if there is no regulator data */
285                 if (!reg_data)
286                         continue;
287
288                 reg = &regs[id];
289                 ri = &rc5t583_reg_info[id];
290                 reg->reg_info = ri;
291                 reg->mfd = rc5t583;
292                 reg->dev = &pdev->dev;
293
294                 if (ri->deepsleep_id == RC5T583_DS_NONE)
295                         goto skip_ext_pwr_config;
296
297                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
298                                 ri->deepsleep_id,
299                                 pdata->regulator_ext_pwr_control[id],
300                                 pdata->regulator_deepsleep_slot[id]);
301                 /*
302                  * Configuring external control is not a major issue,
303                  * just give warning.
304                  */
305                 if (ret < 0)
306                         dev_warn(&pdev->dev,
307                                 "Failed to configure ext control %d\n", id);
308
309 skip_ext_pwr_config:
310                 rdev = regulator_register(&ri->desc, &pdev->dev, reg_data, reg, NULL);
311                 if (IS_ERR(rdev)) {
312                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
313                                                 ri->desc.name);
314                         ret = PTR_ERR(rdev);
315                         goto clean_exit;
316                 }
317                 reg->rdev = rdev;
318         }
319         platform_set_drvdata(pdev, regs);
320         return 0;
321
322 clean_exit:
323         while (--id >= 0)
324                 regulator_unregister(regs[id].rdev);
325
326         return ret;
327 }
328
329 static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
330 {
331         struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
332         int id;
333
334         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
335                 regulator_unregister(regs[id].rdev);
336         return 0;
337 }
338
339 static struct platform_driver rc5t583_regulator_driver = {
340         .driver = {
341                 .name   = "rc5t583-regulator",
342                 .owner  = THIS_MODULE,
343         },
344         .probe          = rc5t583_regulator_probe,
345         .remove         = __devexit_p(rc5t583_regulator_remove),
346 };
347
348 static int __init rc5t583_regulator_init(void)
349 {
350         return platform_driver_register(&rc5t583_regulator_driver);
351 }
352 subsys_initcall(rc5t583_regulator_init);
353
354 static void __exit rc5t583_regulator_exit(void)
355 {
356         platform_driver_unregister(&rc5t583_regulator_driver);
357 }
358 module_exit(rc5t583_regulator_exit);
359
360 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
361 MODULE_DESCRIPTION("RC5T583 regulator driver");
362 MODULE_ALIAS("platform:rc5t583-regulator");
363 MODULE_LICENSE("GPL v2");