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1b1247dd LD |
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 | ||
83 | int rc5t583_write(struct device *dev, uint8_t reg, uint8_t val) | |
84 | { | |
85 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev); | |
86 | return regmap_write(rc5t583->regmap, reg, val); | |
87 | } | |
88 | ||
89 | int rc5t583_read(struct device *dev, uint8_t reg, uint8_t *val) | |
90 | { | |
91 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev); | |
92 | unsigned int ival; | |
93 | int ret; | |
94 | ret = regmap_read(rc5t583->regmap, reg, &ival); | |
95 | if (!ret) | |
96 | *val = (uint8_t)ival; | |
97 | return ret; | |
98 | } | |
99 | ||
100 | int rc5t583_set_bits(struct device *dev, unsigned int reg, | |
101 | unsigned int bit_mask) | |
102 | { | |
103 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev); | |
104 | return regmap_update_bits(rc5t583->regmap, reg, bit_mask, bit_mask); | |
105 | } | |
106 | ||
107 | int rc5t583_clear_bits(struct device *dev, unsigned int reg, | |
108 | unsigned int bit_mask) | |
109 | { | |
110 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev); | |
111 | return regmap_update_bits(rc5t583->regmap, reg, bit_mask, 0); | |
112 | } | |
113 | ||
114 | int rc5t583_update(struct device *dev, unsigned int reg, | |
115 | unsigned int val, unsigned int mask) | |
116 | { | |
117 | struct rc5t583 *rc5t583 = dev_get_drvdata(dev); | |
118 | return regmap_update_bits(rc5t583->regmap, reg, mask, val); | |
119 | } | |
120 | ||
121 | static int __rc5t583_set_ext_pwrreq1_control(struct device *dev, | |
122 | int id, int ext_pwr, int slots) | |
123 | { | |
124 | int ret; | |
125 | uint8_t sleepseq_val; | |
126 | unsigned int en_bit; | |
127 | unsigned int slot_bit; | |
128 | ||
129 | if (id == RC5T583_DS_DC0) { | |
130 | dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id); | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | en_bit = deepsleep_data[id].ds_pos_bit; | |
135 | slot_bit = en_bit + 1; | |
136 | ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val); | |
137 | if (ret < 0) { | |
138 | dev_err(dev, "Error in reading reg 0x%x\n", | |
139 | deepsleep_data[id].reg_add); | |
140 | return ret; | |
141 | } | |
142 | ||
143 | sleepseq_val &= ~(0xF << en_bit); | |
144 | sleepseq_val |= BIT(en_bit); | |
145 | sleepseq_val |= ((slots & 0x7) << slot_bit); | |
146 | ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1)); | |
147 | if (ret < 0) { | |
148 | dev_err(dev, "Error in updating the 0x%02x register\n", | |
149 | RICOH_ONOFFSEL_REG); | |
150 | return ret; | |
151 | } | |
152 | ||
153 | ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val); | |
154 | if (ret < 0) { | |
155 | dev_err(dev, "Error in writing reg 0x%x\n", | |
156 | deepsleep_data[id].reg_add); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | if (id == RC5T583_DS_LDO4) { | |
161 | ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1); | |
162 | if (ret < 0) | |
163 | dev_err(dev, "Error in writing reg 0x%x\n", | |
164 | RICOH_SWCTL_REG); | |
165 | } | |
166 | return ret; | |
167 | } | |
168 | ||
169 | static int __rc5t583_set_ext_pwrreq2_control(struct device *dev, | |
170 | int id, int ext_pwr) | |
171 | { | |
172 | int ret; | |
173 | ||
174 | if (id != RC5T583_DS_DC0) { | |
175 | dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id); | |
176 | return -EINVAL; | |
177 | } | |
178 | ||
179 | ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2)); | |
180 | if (ret < 0) | |
181 | dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n"); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | int rc5t583_ext_power_req_config(struct device *dev, int ds_id, | |
186 | int ext_pwr_req, int deepsleep_slot_nr) | |
187 | { | |
188 | if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ) | |
189 | return -EINVAL; | |
190 | ||
191 | if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL) | |
192 | return __rc5t583_set_ext_pwrreq1_control(dev, ds_id, | |
193 | ext_pwr_req, deepsleep_slot_nr); | |
194 | ||
195 | if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL) | |
196 | return __rc5t583_set_ext_pwrreq2_control(dev, | |
197 | ds_id, ext_pwr_req); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583, | |
202 | struct rc5t583_platform_data *pdata) | |
203 | { | |
204 | int ret; | |
205 | int i; | |
206 | uint8_t on_off_val = 0; | |
207 | ||
208 | /* Clear ONOFFSEL register */ | |
209 | if (pdata->enable_shutdown) | |
210 | on_off_val = 0x1; | |
211 | ||
212 | ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val); | |
213 | if (ret < 0) | |
214 | dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", | |
215 | RICOH_ONOFFSEL_REG, ret); | |
216 | ||
217 | ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0); | |
218 | if (ret < 0) | |
219 | dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", | |
220 | RICOH_SWCTL_REG, ret); | |
221 | ||
222 | /* Clear sleep sequence register */ | |
223 | for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) { | |
224 | ret = rc5t583_write(rc5t583->dev, i, 0x0); | |
225 | if (ret < 0) | |
226 | dev_warn(rc5t583->dev, | |
227 | "Error in writing reg 0x%02x error: %d\n", | |
228 | i, ret); | |
229 | } | |
230 | return 0; | |
231 | } | |
232 | ||
233 | static bool volatile_reg(struct device *dev, unsigned int reg) | |
234 | { | |
235 | /* Enable caching in interrupt registers */ | |
236 | switch (reg) { | |
237 | case RC5T583_INT_EN_SYS1: | |
238 | case RC5T583_INT_EN_SYS2: | |
239 | case RC5T583_INT_EN_DCDC: | |
240 | case RC5T583_INT_EN_RTC: | |
241 | case RC5T583_INT_EN_ADC1: | |
242 | case RC5T583_INT_EN_ADC2: | |
243 | case RC5T583_INT_EN_ADC3: | |
244 | case RC5T583_GPIO_GPEDGE1: | |
245 | case RC5T583_GPIO_GPEDGE2: | |
246 | case RC5T583_GPIO_EN_INT: | |
247 | return false; | |
248 | ||
249 | case RC5T583_GPIO_MON_IOIN: | |
250 | /* This is gpio input register */ | |
251 | return true; | |
252 | ||
253 | default: | |
254 | /* Enable caching in gpio registers */ | |
255 | if ((reg >= RC5T583_GPIO_IOSEL) && | |
256 | (reg <= RC5T583_GPIO_GPOFUNC)) | |
257 | return false; | |
258 | ||
259 | /* Enable caching in sleep seq registers */ | |
260 | if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11)) | |
261 | return false; | |
262 | ||
263 | /* Enable caching of regulator registers */ | |
264 | if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL)) | |
265 | return false; | |
266 | if ((reg >= RC5T583_REG_LDOEN1) && | |
267 | (reg <= RC5T583_REG_LDO9DAC_DS)) | |
268 | return false; | |
269 | ||
270 | break; | |
271 | } | |
272 | ||
273 | return true; | |
274 | } | |
275 | ||
276 | static const struct regmap_config rc5t583_regmap_config = { | |
277 | .reg_bits = 8, | |
278 | .val_bits = 8, | |
279 | .volatile_reg = volatile_reg, | |
280 | .max_register = RC5T583_MAX_REGS, | |
281 | .num_reg_defaults_raw = RC5T583_MAX_REGS, | |
282 | .cache_type = REGCACHE_RBTREE, | |
283 | }; | |
284 | ||
285 | static int __devinit rc5t583_i2c_probe(struct i2c_client *i2c, | |
286 | const struct i2c_device_id *id) | |
287 | { | |
288 | struct rc5t583 *rc5t583; | |
289 | struct rc5t583_platform_data *pdata = i2c->dev.platform_data; | |
290 | int ret; | |
291 | bool irq_init_success = false; | |
292 | ||
293 | if (!pdata) { | |
294 | dev_err(&i2c->dev, "Err: Platform data not found\n"); | |
295 | return -EINVAL; | |
296 | } | |
297 | ||
298 | rc5t583 = devm_kzalloc(&i2c->dev, sizeof(struct rc5t583), GFP_KERNEL); | |
299 | if (!rc5t583) { | |
300 | dev_err(&i2c->dev, "Memory allocation failed\n"); | |
301 | return -ENOMEM; | |
302 | } | |
303 | ||
304 | rc5t583->dev = &i2c->dev; | |
305 | i2c_set_clientdata(i2c, rc5t583); | |
306 | ||
307 | rc5t583->regmap = regmap_init_i2c(i2c, &rc5t583_regmap_config); | |
308 | if (IS_ERR(rc5t583->regmap)) { | |
309 | ret = PTR_ERR(rc5t583->regmap); | |
310 | dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret); | |
311 | return ret; | |
312 | } | |
313 | ||
314 | ret = rc5t583_clear_ext_power_req(rc5t583, pdata); | |
315 | if (ret < 0) | |
316 | goto err_irq_init; | |
317 | ||
318 | if (i2c->irq) { | |
319 | ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base); | |
320 | /* Still continue with waring if irq init fails */ | |
321 | if (ret) | |
322 | dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret); | |
323 | else | |
324 | irq_init_success = true; | |
325 | } | |
326 | ||
327 | ret = mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs, | |
328 | ARRAY_SIZE(rc5t583_subdevs), NULL, 0); | |
329 | if (ret) { | |
330 | dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret); | |
331 | goto err_add_devs; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | ||
336 | err_add_devs: | |
337 | if (irq_init_success) | |
338 | rc5t583_irq_exit(rc5t583); | |
339 | err_irq_init: | |
340 | regmap_exit(rc5t583->regmap); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | static int __devexit rc5t583_i2c_remove(struct i2c_client *i2c) | |
345 | { | |
346 | struct rc5t583 *rc5t583 = i2c_get_clientdata(i2c); | |
347 | ||
348 | mfd_remove_devices(rc5t583->dev); | |
349 | rc5t583_irq_exit(rc5t583); | |
350 | regmap_exit(rc5t583->regmap); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static const struct i2c_device_id rc5t583_i2c_id[] = { | |
355 | {.name = "rc5t583", .driver_data = 0}, | |
356 | {} | |
357 | }; | |
358 | ||
359 | MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id); | |
360 | ||
361 | static struct i2c_driver rc5t583_i2c_driver = { | |
362 | .driver = { | |
363 | .name = "rc5t583", | |
364 | .owner = THIS_MODULE, | |
365 | }, | |
366 | .probe = rc5t583_i2c_probe, | |
367 | .remove = __devexit_p(rc5t583_i2c_remove), | |
368 | .id_table = rc5t583_i2c_id, | |
369 | }; | |
370 | ||
371 | static int __init rc5t583_i2c_init(void) | |
372 | { | |
373 | return i2c_add_driver(&rc5t583_i2c_driver); | |
374 | } | |
375 | subsys_initcall(rc5t583_i2c_init); | |
376 | ||
377 | static void __exit rc5t583_i2c_exit(void) | |
378 | { | |
379 | i2c_del_driver(&rc5t583_i2c_driver); | |
380 | } | |
381 | ||
382 | module_exit(rc5t583_i2c_exit); | |
383 | ||
384 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
385 | MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver"); | |
386 | MODULE_LICENSE("GPL v2"); |