Merge remote-tracking branch 'regulator/topic/change' into regulator-next
[linux-3.10.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/init.h>
27 #include <linux/slab.h>
28 #include <linux/err.h>
29 #include <linux/platform_device.h>
30 #include <linux/regulator/driver.h>
31 #include <linux/regulator/machine.h>
32 #include <linux/gpio.h>
33 #include <linux/mfd/rc5t583.h>
34
35 struct rc5t583_regulator_info {
36         int                     deepsleep_id;
37
38         /* Regulator register address.*/
39         uint8_t                 reg_disc_reg;
40         uint8_t                 disc_bit;
41         uint8_t                 deepsleep_reg;
42
43         /* Regulator specific turn-on delay  and voltage settling time*/
44         int                     enable_uv_per_us;
45
46         /* Used by regulator core */
47         struct regulator_desc   desc;
48 };
49
50 struct rc5t583_regulator {
51         struct rc5t583_regulator_info *reg_info;
52
53         /* Devices */
54         struct device           *dev;
55         struct rc5t583          *mfd;
56         struct regulator_dev    *rdev;
57 };
58
59 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
60 {
61         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
62         int vsel = regulator_get_voltage_sel_regmap(rdev);
63         int curr_uV = regulator_list_voltage_linear(rdev, vsel);
64
65         return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
66 }
67
68 static struct regulator_ops rc5t583_ops = {
69         .is_enabled             = regulator_is_enabled_regmap,
70         .enable                 = regulator_enable_regmap,
71         .disable                = regulator_disable_regmap,
72         .enable_time            = rc5t583_regulator_enable_time,
73         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
74         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
75         .list_voltage           = regulator_list_voltage_linear,
76         .map_voltage            = regulator_map_voltage_linear,
77         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
78 };
79
80 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
81                 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
82 {                                                               \
83         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
84         .disc_bit       = _disc_bit,                            \
85         .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
86         .enable_uv_per_us = _enable_mv * 1000,                  \
87         .deepsleep_id   = RC5T583_DS_##_id,                     \
88         .desc = {                                               \
89                 .name = "rc5t583-regulator-"#_id,               \
90                 .id = RC5T583_REGULATOR_##_id,                  \
91                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
92                 .ops = &rc5t583_ops,                            \
93                 .type = REGULATOR_VOLTAGE,                      \
94                 .owner = THIS_MODULE,                           \
95                 .vsel_reg = RC5T583_REG_##_id##DAC,             \
96                 .vsel_mask = _vout_mask,                        \
97                 .enable_reg = RC5T583_REG_##_en_reg,            \
98                 .enable_mask = BIT(_en_bit),                    \
99                 .min_uV = _min_mv * 1000,                       \
100                 .uV_step = _step_uV,                            \
101                 .ramp_delay = 40 * 1000,                        \
102         },                                                      \
103 }
104
105 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
106         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
107         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
108         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
109         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
110         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
111         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
112         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
113         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
114         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
115         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
116         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
117         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
118         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
119         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
120 };
121
122 static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
123 {
124         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
125         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
126         struct regulator_init_data *reg_data;
127         struct regulator_config config = { };
128         struct rc5t583_regulator *reg = NULL;
129         struct rc5t583_regulator *regs;
130         struct regulator_dev *rdev;
131         struct rc5t583_regulator_info *ri;
132         int ret;
133         int id;
134
135         if (!pdata) {
136                 dev_err(&pdev->dev, "No platform data, exiting...\n");
137                 return -ENODEV;
138         }
139
140         regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
141                         sizeof(struct rc5t583_regulator), GFP_KERNEL);
142         if (!regs) {
143                 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
144                 return -ENOMEM;
145         }
146
147
148         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
149                 reg_data = pdata->reg_init_data[id];
150
151                 /* No need to register if there is no regulator data */
152                 if (!reg_data)
153                         continue;
154
155                 reg = &regs[id];
156                 ri = &rc5t583_reg_info[id];
157                 reg->reg_info = ri;
158                 reg->mfd = rc5t583;
159                 reg->dev = &pdev->dev;
160
161                 if (ri->deepsleep_id == RC5T583_DS_NONE)
162                         goto skip_ext_pwr_config;
163
164                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
165                                 ri->deepsleep_id,
166                                 pdata->regulator_ext_pwr_control[id],
167                                 pdata->regulator_deepsleep_slot[id]);
168                 /*
169                  * Configuring external control is not a major issue,
170                  * just give warning.
171                  */
172                 if (ret < 0)
173                         dev_warn(&pdev->dev,
174                                 "Failed to configure ext control %d\n", id);
175
176 skip_ext_pwr_config:
177                 config.dev = &pdev->dev;
178                 config.init_data = reg_data;
179                 config.driver_data = reg;
180                 config.regmap = rc5t583->regmap;
181
182                 rdev = regulator_register(&ri->desc, &config);
183                 if (IS_ERR(rdev)) {
184                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
185                                                 ri->desc.name);
186                         ret = PTR_ERR(rdev);
187                         goto clean_exit;
188                 }
189                 reg->rdev = rdev;
190         }
191         platform_set_drvdata(pdev, regs);
192         return 0;
193
194 clean_exit:
195         while (--id >= 0)
196                 regulator_unregister(regs[id].rdev);
197
198         return ret;
199 }
200
201 static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
202 {
203         struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
204         int id;
205
206         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
207                 regulator_unregister(regs[id].rdev);
208         return 0;
209 }
210
211 static struct platform_driver rc5t583_regulator_driver = {
212         .driver = {
213                 .name   = "rc5t583-regulator",
214                 .owner  = THIS_MODULE,
215         },
216         .probe          = rc5t583_regulator_probe,
217         .remove         = __devexit_p(rc5t583_regulator_remove),
218 };
219
220 static int __init rc5t583_regulator_init(void)
221 {
222         return platform_driver_register(&rc5t583_regulator_driver);
223 }
224 subsys_initcall(rc5t583_regulator_init);
225
226 static void __exit rc5t583_regulator_exit(void)
227 {
228         platform_driver_unregister(&rc5t583_regulator_driver);
229 }
230 module_exit(rc5t583_regulator_exit);
231
232 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
233 MODULE_DESCRIPTION("RC5T583 regulator driver");
234 MODULE_ALIAS("platform:rc5t583-regulator");
235 MODULE_LICENSE("GPL v2");