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rc5t583-regulator.c
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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 <[email protected]>
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 <[email protected]>");
233 MODULE_DESCRIPTION("RC5T583 regulator driver");
234 MODULE_ALIAS("platform:rc5t583-regulator");
235 MODULE_LICENSE("GPL v2");
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