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 const struct mfd_cell rc5t583_subdevs[] = { 78 {.name = "rc5t583-gpio",}, 79 {.name = "rc5t583-regulator",}, 80 {.name = "rc5t583-rtc", }, 81 {.name = "rc5t583-key", } 82 }; 83 84 static int __rc5t583_set_ext_pwrreq1_control(struct device *dev, 85 int id, int ext_pwr, int slots) 86 { 87 int ret; 88 uint8_t sleepseq_val = 0; 89 unsigned int en_bit; 90 unsigned int slot_bit; 91 92 if (id == RC5T583_DS_DC0) { 93 dev_err(dev, "PWRREQ1 is invalid control for rail %d\n", id); 94 return -EINVAL; 95 } 96 97 en_bit = deepsleep_data[id].ds_pos_bit; 98 slot_bit = en_bit + 1; 99 ret = rc5t583_read(dev, deepsleep_data[id].reg_add, &sleepseq_val); 100 if (ret < 0) { 101 dev_err(dev, "Error in reading reg 0x%x\n", 102 deepsleep_data[id].reg_add); 103 return ret; 104 } 105 106 sleepseq_val &= ~(0xF << en_bit); 107 sleepseq_val |= BIT(en_bit); 108 sleepseq_val |= ((slots & 0x7) << slot_bit); 109 ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(1)); 110 if (ret < 0) { 111 dev_err(dev, "Error in updating the 0x%02x register\n", 112 RICOH_ONOFFSEL_REG); 113 return ret; 114 } 115 116 ret = rc5t583_write(dev, deepsleep_data[id].reg_add, sleepseq_val); 117 if (ret < 0) { 118 dev_err(dev, "Error in writing reg 0x%x\n", 119 deepsleep_data[id].reg_add); 120 return ret; 121 } 122 123 if (id == RC5T583_DS_LDO4) { 124 ret = rc5t583_write(dev, RICOH_SWCTL_REG, 0x1); 125 if (ret < 0) 126 dev_err(dev, "Error in writing reg 0x%x\n", 127 RICOH_SWCTL_REG); 128 } 129 return ret; 130 } 131 132 static int __rc5t583_set_ext_pwrreq2_control(struct device *dev, 133 int id, int ext_pwr) 134 { 135 int ret; 136 137 if (id != RC5T583_DS_DC0) { 138 dev_err(dev, "PWRREQ2 is invalid control for rail %d\n", id); 139 return -EINVAL; 140 } 141 142 ret = rc5t583_set_bits(dev, RICOH_ONOFFSEL_REG, BIT(2)); 143 if (ret < 0) 144 dev_err(dev, "Error in updating the ONOFFSEL 0x10 register\n"); 145 return ret; 146 } 147 148 int rc5t583_ext_power_req_config(struct device *dev, int ds_id, 149 int ext_pwr_req, int deepsleep_slot_nr) 150 { 151 if ((ext_pwr_req & EXT_PWR_REQ) == EXT_PWR_REQ) 152 return -EINVAL; 153 154 if (ext_pwr_req & RC5T583_EXT_PWRREQ1_CONTROL) 155 return __rc5t583_set_ext_pwrreq1_control(dev, ds_id, 156 ext_pwr_req, deepsleep_slot_nr); 157 158 if (ext_pwr_req & RC5T583_EXT_PWRREQ2_CONTROL) 159 return __rc5t583_set_ext_pwrreq2_control(dev, 160 ds_id, ext_pwr_req); 161 return 0; 162 } 163 EXPORT_SYMBOL(rc5t583_ext_power_req_config); 164 165 static int rc5t583_clear_ext_power_req(struct rc5t583 *rc5t583, 166 struct rc5t583_platform_data *pdata) 167 { 168 int ret; 169 int i; 170 uint8_t on_off_val = 0; 171 172 /* Clear ONOFFSEL register */ 173 if (pdata->enable_shutdown) 174 on_off_val = 0x1; 175 176 ret = rc5t583_write(rc5t583->dev, RICOH_ONOFFSEL_REG, on_off_val); 177 if (ret < 0) 178 dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", 179 RICOH_ONOFFSEL_REG, ret); 180 181 ret = rc5t583_write(rc5t583->dev, RICOH_SWCTL_REG, 0x0); 182 if (ret < 0) 183 dev_warn(rc5t583->dev, "Error in writing reg %d error: %d\n", 184 RICOH_SWCTL_REG, ret); 185 186 /* Clear sleep sequence register */ 187 for (i = RC5T583_SLPSEQ1; i <= RC5T583_SLPSEQ11; ++i) { 188 ret = rc5t583_write(rc5t583->dev, i, 0x0); 189 if (ret < 0) 190 dev_warn(rc5t583->dev, 191 "Error in writing reg 0x%02x error: %d\n", 192 i, ret); 193 } 194 return 0; 195 } 196 197 static bool volatile_reg(struct device *dev, unsigned int reg) 198 { 199 /* Enable caching in interrupt registers */ 200 switch (reg) { 201 case RC5T583_INT_EN_SYS1: 202 case RC5T583_INT_EN_SYS2: 203 case RC5T583_INT_EN_DCDC: 204 case RC5T583_INT_EN_RTC: 205 case RC5T583_INT_EN_ADC1: 206 case RC5T583_INT_EN_ADC2: 207 case RC5T583_INT_EN_ADC3: 208 case RC5T583_GPIO_GPEDGE1: 209 case RC5T583_GPIO_GPEDGE2: 210 case RC5T583_GPIO_EN_INT: 211 return false; 212 213 case RC5T583_GPIO_MON_IOIN: 214 /* This is gpio input register */ 215 return true; 216 217 default: 218 /* Enable caching in gpio registers */ 219 if ((reg >= RC5T583_GPIO_IOSEL) && 220 (reg <= RC5T583_GPIO_GPOFUNC)) 221 return false; 222 223 /* Enable caching in sleep seq registers */ 224 if ((reg >= RC5T583_SLPSEQ1) && (reg <= RC5T583_SLPSEQ11)) 225 return false; 226 227 /* Enable caching of regulator registers */ 228 if ((reg >= RC5T583_REG_DC0CTL) && (reg <= RC5T583_REG_SR3CTL)) 229 return false; 230 if ((reg >= RC5T583_REG_LDOEN1) && 231 (reg <= RC5T583_REG_LDO9DAC_DS)) 232 return false; 233 234 break; 235 } 236 237 return true; 238 } 239 240 static const struct regmap_config rc5t583_regmap_config = { 241 .reg_bits = 8, 242 .val_bits = 8, 243 .volatile_reg = volatile_reg, 244 .max_register = RC5T583_MAX_REGS, 245 .num_reg_defaults_raw = RC5T583_MAX_REGS, 246 .cache_type = REGCACHE_RBTREE, 247 }; 248 249 static int rc5t583_i2c_probe(struct i2c_client *i2c, 250 const struct i2c_device_id *id) 251 { 252 struct rc5t583 *rc5t583; 253 struct rc5t583_platform_data *pdata = dev_get_platdata(&i2c->dev); 254 int ret; 255 bool irq_init_success = false; 256 257 if (!pdata) { 258 dev_err(&i2c->dev, "Err: Platform data not found\n"); 259 return -EINVAL; 260 } 261 262 rc5t583 = devm_kzalloc(&i2c->dev, sizeof(struct rc5t583), GFP_KERNEL); 263 if (!rc5t583) { 264 dev_err(&i2c->dev, "Memory allocation failed\n"); 265 return -ENOMEM; 266 } 267 268 rc5t583->dev = &i2c->dev; 269 i2c_set_clientdata(i2c, rc5t583); 270 271 rc5t583->regmap = devm_regmap_init_i2c(i2c, &rc5t583_regmap_config); 272 if (IS_ERR(rc5t583->regmap)) { 273 ret = PTR_ERR(rc5t583->regmap); 274 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret); 275 return ret; 276 } 277 278 ret = rc5t583_clear_ext_power_req(rc5t583, pdata); 279 if (ret < 0) 280 return ret; 281 282 if (i2c->irq) { 283 ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base); 284 /* Still continue with warning, if irq init fails */ 285 if (ret) 286 dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret); 287 else 288 irq_init_success = true; 289 } 290 291 ret = mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs, 292 ARRAY_SIZE(rc5t583_subdevs), NULL, 0, NULL); 293 if (ret) { 294 dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret); 295 goto err_add_devs; 296 } 297 298 return 0; 299 300 err_add_devs: 301 if (irq_init_success) 302 rc5t583_irq_exit(rc5t583); 303 return ret; 304 } 305 306 static int rc5t583_i2c_remove(struct i2c_client *i2c) 307 { 308 struct rc5t583 *rc5t583 = i2c_get_clientdata(i2c); 309 310 mfd_remove_devices(rc5t583->dev); 311 rc5t583_irq_exit(rc5t583); 312 return 0; 313 } 314 315 static const struct i2c_device_id rc5t583_i2c_id[] = { 316 {.name = "rc5t583", .driver_data = 0}, 317 {} 318 }; 319 320 MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id); 321 322 static struct i2c_driver rc5t583_i2c_driver = { 323 .driver = { 324 .name = "rc5t583", 325 }, 326 .probe = rc5t583_i2c_probe, 327 .remove = rc5t583_i2c_remove, 328 .id_table = rc5t583_i2c_id, 329 }; 330 331 static int __init rc5t583_i2c_init(void) 332 { 333 return i2c_add_driver(&rc5t583_i2c_driver); 334 } 335 subsys_initcall(rc5t583_i2c_init); 336 337 static void __exit rc5t583_i2c_exit(void) 338 { 339 i2c_del_driver(&rc5t583_i2c_driver); 340 } 341 342 module_exit(rc5t583_i2c_exit); 343 344 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 345 MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver"); 346 MODULE_LICENSE("GPL v2"); 347