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Linux/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         struct regulator_dev    *rdev;
 53 };
 54 
 55 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
 56 {
 57         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
 58         int vsel = regulator_get_voltage_sel_regmap(rdev);
 59         int curr_uV = regulator_list_voltage_linear(rdev, vsel);
 60 
 61         return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
 62 }
 63 
 64 static struct regulator_ops rc5t583_ops = {
 65         .is_enabled             = regulator_is_enabled_regmap,
 66         .enable                 = regulator_enable_regmap,
 67         .disable                = regulator_disable_regmap,
 68         .enable_time            = rc5t583_regulator_enable_time,
 69         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 70         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 71         .list_voltage           = regulator_list_voltage_linear,
 72         .map_voltage            = regulator_map_voltage_linear,
 73         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 74 };
 75 
 76 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
 77                 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
 78 {                                                               \
 79         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
 80         .disc_bit       = _disc_bit,                            \
 81         .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
 82         .enable_uv_per_us = _enable_mv * 1000,                  \
 83         .deepsleep_id   = RC5T583_DS_##_id,                     \
 84         .desc = {                                               \
 85                 .name = "rc5t583-regulator-"#_id,               \
 86                 .id = RC5T583_REGULATOR_##_id,                  \
 87                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
 88                 .ops = &rc5t583_ops,                            \
 89                 .type = REGULATOR_VOLTAGE,                      \
 90                 .owner = THIS_MODULE,                           \
 91                 .vsel_reg = RC5T583_REG_##_id##DAC,             \
 92                 .vsel_mask = _vout_mask,                        \
 93                 .enable_reg = RC5T583_REG_##_en_reg,            \
 94                 .enable_mask = BIT(_en_bit),                    \
 95                 .min_uV = _min_mv * 1000,                       \
 96                 .uV_step = _step_uV,                            \
 97                 .ramp_delay = 40 * 1000,                        \
 98         },                                                      \
 99 }
100 
101 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
102         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
103         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
104         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
105         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
106         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
107         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
108         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
109         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
110         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
111         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
112         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
113         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
114         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
115         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
116 };
117 
118 static int rc5t583_regulator_probe(struct platform_device *pdev)
119 {
120         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
121         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
122         struct regulator_config config = { };
123         struct rc5t583_regulator *reg = NULL;
124         struct rc5t583_regulator *regs;
125         struct regulator_dev *rdev;
126         struct rc5t583_regulator_info *ri;
127         int ret;
128         int id;
129 
130         if (!pdata) {
131                 dev_err(&pdev->dev, "No platform data, exiting...\n");
132                 return -ENODEV;
133         }
134 
135         regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
136                         sizeof(struct rc5t583_regulator), GFP_KERNEL);
137         if (!regs)
138                 return -ENOMEM;
139 
140 
141         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
142                 reg = &regs[id];
143                 ri = &rc5t583_reg_info[id];
144                 reg->reg_info = ri;
145 
146                 if (ri->deepsleep_id == RC5T583_DS_NONE)
147                         goto skip_ext_pwr_config;
148 
149                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
150                                 ri->deepsleep_id,
151                                 pdata->regulator_ext_pwr_control[id],
152                                 pdata->regulator_deepsleep_slot[id]);
153                 /*
154                  * Configuring external control is not a major issue,
155                  * just give warning.
156                  */
157                 if (ret < 0)
158                         dev_warn(&pdev->dev,
159                                 "Failed to configure ext control %d\n", id);
160 
161 skip_ext_pwr_config:
162                 config.dev = &pdev->dev;
163                 config.init_data = pdata->reg_init_data[id];
164                 config.driver_data = reg;
165                 config.regmap = rc5t583->regmap;
166 
167                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
168                 if (IS_ERR(rdev)) {
169                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
170                                                 ri->desc.name);
171                         return PTR_ERR(rdev);
172                 }
173                 reg->rdev = rdev;
174         }
175         platform_set_drvdata(pdev, regs);
176         return 0;
177 }
178 
179 static struct platform_driver rc5t583_regulator_driver = {
180         .driver = {
181                 .name   = "rc5t583-regulator",
182                 .owner  = THIS_MODULE,
183         },
184         .probe          = rc5t583_regulator_probe,
185 };
186 
187 static int __init rc5t583_regulator_init(void)
188 {
189         return platform_driver_register(&rc5t583_regulator_driver);
190 }
191 subsys_initcall(rc5t583_regulator_init);
192 
193 static void __exit rc5t583_regulator_exit(void)
194 {
195         platform_driver_unregister(&rc5t583_regulator_driver);
196 }
197 module_exit(rc5t583_regulator_exit);
198 
199 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
200 MODULE_DESCRIPTION("RC5T583 regulator driver");
201 MODULE_ALIAS("platform:rc5t583-regulator");
202 MODULE_LICENSE("GPL v2");
203 

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