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1 | /* | |
2 | * Core driver access 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 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms and conditions of the GNU General Public License, | |
12 | * version 2, as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope it will be useful, but WITHOUT | |
15 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
17 | * more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
21 | * | |
22 | */ | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/irq.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/mfd/core.h> | |
31 | #include <linux/mfd/rc5t583.h> | |
32 | #include <linux/regmap.h> | |
33 | ||
34 | #define RICOH_ONOFFSEL_REG 0x10 | |
35 | #define RICOH_SWCTL_REG 0x5E | |
36 | ||
37 | struct deepsleep_control_data { | |
38 | u8 reg_add; | |
39 | u8 ds_pos_bit; | |
40 | }; | |
41 | ||
42 | #define DEEPSLEEP_INIT(_id, _reg, _pos) \ | |
43 | { \ | |
44 | .reg_add = RC5T583_##_reg, \ | |
45 | .ds_pos_bit = _pos, \ | |
46 | } | |
47 | ||
48 | static struct deepsleep_control_data deepsleep_data[] = { | |
49 | DEEPSLEEP_INIT(DC0, SLPSEQ1, 0), | |
50 | DEEPSLEEP_INIT(DC1, SLPSEQ1, 4), | |
51 | DEEPSLEEP_INIT(DC2, SLPSEQ2, 0), | |
52 | DEEPSLEEP_INIT(DC3, SLPSEQ2, 4), | |
53 | DEEPSLEEP_INIT(LDO0, SLPSEQ3, 0), | |
54 | DEEPSLEEP_INIT(LDO1, SLPSEQ3, 4), | |
55 | DEEPSLEEP_INIT(LDO2, SLPSEQ4, 0), | |
56 | DEEPSLEEP_INIT(LDO3, SLPSEQ4, 4), | |
57 | DEEPSLEEP_INIT(LDO4, SLPSEQ5, 0), | |
58 | DEEPSLEEP_INIT(LDO5, SLPSEQ5, 4), | |
59 | DEEPSLEEP_INIT(LDO6, SLPSEQ6, 0), | |
60 | DEEPSLEEP_INIT(LDO7, SLPSEQ6, 4), | |
61 | DEEPSLEEP_INIT(LDO8, SLPSEQ7, 0), | |
62 | DEEPSLEEP_INIT(LDO9, SLPSEQ7, 4), | |
63 | DEEPSLEEP_INIT(PSO0, SLPSEQ8, 0), | |
64 | DEEPSLEEP_INIT(PSO1, SLPSEQ8, 4), | |
65 | DEEPSLEEP_INIT(PSO2, SLPSEQ9, 0), | |
66 | DEEPSLEEP_INIT(PSO3, SLPSEQ9, 4), | |
67 | DEEPSLEEP_INIT(PSO4, SLPSEQ10, 0), | |
68 | DEEPSLEEP_INIT(PSO5, SLPSEQ10, 4), | |
69 | DEEPSLEEP_INIT(PSO6, SLPSEQ11, 0), | |
70 | DEEPSLEEP_INIT(PSO7, SLPSEQ11, 4), | |
71 | }; | |
72 | ||
73 | #define EXT_PWR_REQ \ | |
74 | (RC5T583_EXT_PWRREQ1_CONTROL | RC5T583_EXT_PWRREQ2_CONTROL) | |
75 | ||
76 | static const struct mfd_cell rc5t583_subdevs[] = { | |
77 | {.name = "rc5t583-gpio",}, | |
78 | {.name = "rc5t583-regulator",}, | |
79 | {.name = "rc5t583-rtc", }, | |
80 | {.name = "rc5t583-key", } | |
81 | }; | |
82 | ||
83 | static int __rc5t583_set_ext_pwrreq1_control(struct device *dev, | |
84 | int id, int ext_pwr, int slots) | |
85 | { | |
86 | int ret; | |
87 | uint8_t sleepseq_val = 0; | |
88 | unsigned int en_bit; | |
89 | unsigned int slot_bit; | |
90 | ||
91 | if (id == RC5T583_DS_DC0) { | |
92 | dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id); | |
93 | return -EINVAL; | |
94 | } | |
95 | ||
96 | en_bit = deepsleep_data[id].ds_pos_bit; | |
97 | slot_bit = en_bit + 1; | |
98 | ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val); | |
99 | if (ret < 0) { | |
100 | dev_err(dev, "Error in reading reg 0x%x\n", | |
101 | deepsleep_data[id].reg_add); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | sleepseq_val &= ~(0xF << en_bit); | |
106 | sleepseq_val |= BIT(en_bit); | |
107 | sleepseq_val |= ((slots & 0x7) << slot_bit); | |
108 | ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1)); | |
109 | if (ret < 0) { | |
110 | dev_err(dev, "Error in updating the 0x%02x register\n", | |
111 | RICOH_ONOFFSEL_REG); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val); | |
116 | if (ret < 0) { | |
117 | dev_err(dev, "Error in writing reg 0x%x\n", | |
118 | deepsleep_data[id].reg_add); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | if (id == RC5T583_DS_LDO4) { | |
123 | ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1); | |
124 | if (ret < 0) | |
125 | dev_err(dev, "Error in writing reg 0x%x\n", | |
126 | RICOH_SWCTL_REG); | |
127 | } | |
128 | return ret; | |
129 | } | |
130 | ||
131 | static int __rc5t583_set_ext_pwrreq2_control(struct device *dev, | |
132 | int id, int ext_pwr) | |
133 | { | |
134 | int ret; | |
135 | ||
136 | if (id != RC5T583_DS_DC0) { | |
137 | dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id); | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
141 | ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2)); | |
142 | if (ret < 0) | |
143 | dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n"); | |
144 | return ret; | |
145 | } | |
146 | ||
147 | int rc5t583_ext_power_req_config(struct device *dev, int ds_id, | |
148 | int ext_pwr_req, int deepsleep_slot_nr) | |
149 | { | |
150 | if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ) | |
151 | return -EINVAL; | |
152 | ||
153 | if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL) | |
154 | return __rc5t583_set_ext_pwrreq1_control(dev, ds_id, | |
155 | ext_pwr_req, deepsleep_slot_nr); | |
156 | ||
157 | if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL) | |
158 | return __rc5t583_set_ext_pwrreq2_control(dev, | |
159 | ds_id, ext_pwr_req); | |
160 | return 0; | |
161 | } | |
162 | EXPORT_SYMBOL(rc5t583_ext_power_req_config); | |
163 | ||
164 | static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583, | |
165 | struct rc5t583_platform_data *pdata) | |
166 | { | |
167 | int ret; | |
168 | int i; | |
169 | uint8_t on_off_val = 0; | |
170 | ||
171 | /* Clear ONOFFSEL register */ | |
172 | if (pdata->enable_shutdown) | |
173 | on_off_val = 0x1; | |
174 | ||
175 | ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val); | |
176 | if (ret < 0) | |
177 | dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", | |
178 | RICOH_ONOFFSEL_REG, ret); | |
179 | ||
180 | ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0); | |
181 | if (ret < 0) | |
182 | dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", | |
183 | RICOH_SWCTL_REG, ret); | |
184 | ||
185 | /* Clear sleep sequence register */ | |
186 | for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) { | |
187 | ret = rc5t583_write(rc5t583->dev, i, 0x0); | |
188 | if (ret < 0) | |
189 | dev_warn(rc5t583->dev, | |
190 | "Error in writing reg 0x%02x error: %d\n", | |
191 | i, ret); | |
192 | } | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static bool volatile_reg(struct device *dev, unsigned int reg) | |
197 | { | |
198 | /* Enable caching in interrupt registers */ | |
199 | switch (reg) { | |
200 | case RC5T583_INT_EN_SYS1: | |
201 | case RC5T583_INT_EN_SYS2: | |
202 | case RC5T583_INT_EN_DCDC: | |
203 | case RC5T583_INT_EN_RTC: | |
204 | case RC5T583_INT_EN_ADC1: | |
205 | case RC5T583_INT_EN_ADC2: | |
206 | case RC5T583_INT_EN_ADC3: | |
207 | case RC5T583_GPIO_GPEDGE1: | |
208 | case RC5T583_GPIO_GPEDGE2: | |
209 | case RC5T583_GPIO_EN_INT: | |
210 | return false; | |
211 | ||
212 | case RC5T583_GPIO_MON_IOIN: | |
213 | /* This is gpio input register */ | |
214 | return true; | |
215 | ||
216 | default: | |
217 | /* Enable caching in gpio registers */ | |
218 | if ((reg >= RC5T583_GPIO_IOSEL) && | |
219 | (reg <= RC5T583_GPIO_GPOFUNC)) | |
220 | return false; | |
221 | ||
222 | /* Enable caching in sleep seq registers */ | |
223 | if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11)) | |
224 | return false; | |
225 | ||
226 | /* Enable caching of regulator registers */ | |
227 | if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL)) | |
228 | return false; | |
229 | if ((reg >= RC5T583_REG_LDOEN1) && | |
230 | (reg <= RC5T583_REG_LDO9DAC_DS)) | |
231 | return false; | |
232 | ||
233 | break; | |
234 | } | |
235 | ||
236 | return true; | |
237 | } | |
238 | ||
239 | static const struct regmap_config rc5t583_regmap_config = { | |
240 | .reg_bits = 8, | |
241 | .val_bits = 8, | |
242 | .volatile_reg = volatile_reg, | |
243 | .max_register = RC5T583_MAX_REG, | |
244 | .num_reg_defaults_raw = RC5T583_NUM_REGS, | |
245 | .cache_type = REGCACHE_RBTREE, | |
246 | }; | |
247 | ||
248 | static int rc5t583_i2c_probe(struct i2c_client *i2c, | |
249 | const struct i2c_device_id *id) | |
250 | { | |
251 | struct rc5t583 *rc5t583; | |
252 | struct rc5t583_platform_data *pdata = dev_get_platdata(&i2c->dev); | |
253 | int ret; | |
254 | ||
255 | if (!pdata) { | |
256 | dev_err(&i2c->dev, "Err: Platform data not found\n"); | |
257 | return -EINVAL; | |
258 | } | |
259 | ||
260 | rc5t583 = devm_kzalloc(&i2c->dev, sizeof(*rc5t583), GFP_KERNEL); | |
261 | if (!rc5t583) | |
262 | return -ENOMEM; | |
263 | ||
264 | rc5t583->dev = &i2c->dev; | |
265 | i2c_set_clientdata(i2c, rc5t583); | |
266 | ||
267 | rc5t583->regmap = devm_regmap_init_i2c(i2c, &rc5t583_regmap_config); | |
268 | if (IS_ERR(rc5t583->regmap)) { | |
269 | ret = PTR_ERR(rc5t583->regmap); | |
270 | dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret); | |
271 | return ret; | |
272 | } | |
273 | ||
274 | ret = rc5t583_clear_ext_power_req(rc5t583, pdata); | |
275 | if (ret < 0) | |
276 | return ret; | |
277 | ||
278 | if (i2c->irq) { | |
279 | ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base); | |
280 | /* Still continue with warning, if irq init fails */ | |
281 | if (ret) | |
282 | dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret); | |
283 | } | |
284 | ||
285 | ret = devm_mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs, | |
286 | ARRAY_SIZE(rc5t583_subdevs), NULL, 0, NULL); | |
287 | if (ret) { | |
288 | dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | static const struct i2c_device_id rc5t583_i2c_id[] = { | |
296 | {.name = "rc5t583", .driver_data = 0}, | |
297 | {} | |
298 | }; | |
299 | ||
300 | static struct i2c_driver rc5t583_i2c_driver = { | |
301 | .driver = { | |
302 | .name = "rc5t583", | |
303 | }, | |
304 | .probe = rc5t583_i2c_probe, | |
305 | .id_table = rc5t583_i2c_id, | |
306 | }; | |
307 | ||
308 | static int __init rc5t583_i2c_init(void) | |
309 | { | |
310 | return i2c_add_driver(&rc5t583_i2c_driver); | |
311 | } | |
312 | subsys_initcall(rc5t583_i2c_init); |