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/module.h>
27 #include <linux/init.h>
28 #include <linux/err.h>
29 #include <linux/slab.h>
30 #include <linux/i2c.h>
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/rc5t583.h>
33 #include <linux/regmap.h>
34
35 #define RICOH_ONOFFSEL_REG 0x10
36 #define RICOH_SWCTL_REG 0x5E
37
38 struct deepsleep_control_data {
39 u8 reg_add;
40 u8 ds_pos_bit;
41 };
42
43 #define DEEPSLEEP_INIT(_id, _reg, _pos) \
44 { \
45 .reg_add = RC5T583_##_reg, \
46 .ds_pos_bit = _pos, \
47 }
48
49 static struct deepsleep_control_data deepsleep_data[] = {
50 DEEPSLEEP_INIT(DC0, SLPSEQ1, 0),
51 DEEPSLEEP_INIT(DC1, SLPSEQ1, 4),
52 DEEPSLEEP_INIT(DC2, SLPSEQ2, 0),
53 DEEPSLEEP_INIT(DC3, SLPSEQ2, 4),
54 DEEPSLEEP_INIT(LDO0, SLPSEQ3, 0),
55 DEEPSLEEP_INIT(LDO1, SLPSEQ3, 4),
56 DEEPSLEEP_INIT(LDO2, SLPSEQ4, 0),
57 DEEPSLEEP_INIT(LDO3, SLPSEQ4, 4),
58 DEEPSLEEP_INIT(LDO4, SLPSEQ5, 0),
59 DEEPSLEEP_INIT(LDO5, SLPSEQ5, 4),
60 DEEPSLEEP_INIT(LDO6, SLPSEQ6, 0),
61 DEEPSLEEP_INIT(LDO7, SLPSEQ6, 4),
62 DEEPSLEEP_INIT(LDO8, SLPSEQ7, 0),
63 DEEPSLEEP_INIT(LDO9, SLPSEQ7, 4),
64 DEEPSLEEP_INIT(PSO0, SLPSEQ8, 0),
65 DEEPSLEEP_INIT(PSO1, SLPSEQ8, 4),
66 DEEPSLEEP_INIT(PSO2, SLPSEQ9, 0),
67 DEEPSLEEP_INIT(PSO3, SLPSEQ9, 4),
68 DEEPSLEEP_INIT(PSO4, SLPSEQ10, 0),
69 DEEPSLEEP_INIT(PSO5, SLPSEQ10, 4),
70 DEEPSLEEP_INIT(PSO6, SLPSEQ11, 0),
71 DEEPSLEEP_INIT(PSO7, SLPSEQ11, 4),
72 };
73
74 #define EXT_PWR_REQ \
75 (RC5T583_EXT_PWRREQ1_CONTROL | RC5T583_EXT_PWRREQ2_CONTROL)
76
77 static struct mfd_cell rc5t583_subdevs[] = {
78 {.name = "rc5t583-regulator",},
79 {.name = "rc5t583-rtc", },
80 {.name = "rc5t583-key", }
81 };
82
__rc5t583_set_ext_pwrreq1_control(struct device * dev,int id,int ext_pwr,int slots)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;
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
__rc5t583_set_ext_pwrreq2_control(struct device * dev,int id,int ext_pwr)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
rc5t583_ext_power_req_config(struct device * dev,int ds_id,int ext_pwr_req,int deepsleep_slot_nr)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
rc5t583_clear_ext_power_req(struct rc5t583 * rc5t583,struct rc5t583_platform_data * pdata)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
volatile_reg(struct device * dev,unsigned int reg)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_REGS,
244 .num_reg_defaults_raw = RC5T583_MAX_REGS,
245 .cache_type = REGCACHE_RBTREE,
246 };
247
rc5t583_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)248 static int __devinit 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 = i2c->dev.platform_data;
253 int ret;
254 bool irq_init_success = false;
255
256 if (!pdata) {
257 dev_err(&i2c->dev, "Err: Platform data not found\n");
258 return -EINVAL;
259 }
260
261 rc5t583 = devm_kzalloc(&i2c->dev, sizeof(struct rc5t583), GFP_KERNEL);
262 if (!rc5t583) {
263 dev_err(&i2c->dev, "Memory allocation failed\n");
264 return -ENOMEM;
265 }
266
267 rc5t583->dev = &i2c->dev;
268 i2c_set_clientdata(i2c, rc5t583);
269
270 rc5t583->regmap = regmap_init_i2c(i2c, &rc5t583_regmap_config);
271 if (IS_ERR(rc5t583->regmap)) {
272 ret = PTR_ERR(rc5t583->regmap);
273 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
274 return ret;
275 }
276
277 ret = rc5t583_clear_ext_power_req(rc5t583, pdata);
278 if (ret < 0)
279 goto err_irq_init;
280
281 if (i2c->irq) {
282 ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base);
283 /* Still continue with waring if irq init fails */
284 if (ret)
285 dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret);
286 else
287 irq_init_success = true;
288 }
289
290 ret = mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs,
291 ARRAY_SIZE(rc5t583_subdevs), NULL, 0);
292 if (ret) {
293 dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret);
294 goto err_add_devs;
295 }
296
297 return 0;
298
299 err_add_devs:
300 if (irq_init_success)
301 rc5t583_irq_exit(rc5t583);
302 err_irq_init:
303 regmap_exit(rc5t583->regmap);
304 return ret;
305 }
306
rc5t583_i2c_remove(struct i2c_client * i2c)307 static int __devexit rc5t583_i2c_remove(struct i2c_client *i2c)
308 {
309 struct rc5t583 *rc5t583 = i2c_get_clientdata(i2c);
310
311 mfd_remove_devices(rc5t583->dev);
312 rc5t583_irq_exit(rc5t583);
313 regmap_exit(rc5t583->regmap);
314 return 0;
315 }
316
317 static const struct i2c_device_id rc5t583_i2c_id[] = {
318 {.name = "rc5t583", .driver_data = 0},
319 {}
320 };
321
322 MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id);
323
324 static struct i2c_driver rc5t583_i2c_driver = {
325 .driver = {
326 .name = "rc5t583",
327 .owner = THIS_MODULE,
328 },
329 .probe = rc5t583_i2c_probe,
330 .remove = __devexit_p(rc5t583_i2c_remove),
331 .id_table = rc5t583_i2c_id,
332 };
333
rc5t583_i2c_init(void)334 static int __init rc5t583_i2c_init(void)
335 {
336 return i2c_add_driver(&rc5t583_i2c_driver);
337 }
338 subsys_initcall(rc5t583_i2c_init);
339
rc5t583_i2c_exit(void)340 static void __exit rc5t583_i2c_exit(void)
341 {
342 i2c_del_driver(&rc5t583_i2c_driver);
343 }
344
345 module_exit(rc5t583_i2c_exit);
346
347 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
348 MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver");
349 MODULE_LICENSE("GPL v2");
350