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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 <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 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 = ®s[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 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 = 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"); |
236 |
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