drivers/mfd/rc5t583.c

   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_REG,
 245         .num_reg_defaults_raw = RC5T583_NUM_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
 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 = devm_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                 return ret;
 280
 281         if (i2c->irq) {
 282                 ret = rc5t583_irq_init(rc5t583, i2c->irq, pdata->irq_base);
 283                 /* Still continue with warning, if irq init fails */
 284                 if (ret)
 285                         dev_warn(&i2c->dev, "IRQ init failed: %d\n", ret);
 286         }
 287
 288         ret = devm_mfd_add_devices(rc5t583->dev, -1, rc5t583_subdevs,
 289                                    ARRAY_SIZE(rc5t583_subdevs), NULL, 0, NULL);
 290         if (ret) {
 291                 dev_err(&i2c->dev, "add mfd devices failed: %d\n", ret);
 292                 return ret;
 293         }
 294
 295         return 0;
 296 }
 297
 298 static const struct i2c_device_id rc5t583_i2c_id[] = {
 299         {.name = "rc5t583", .driver_data = 0},
 300         {}
 301 };
 302
 303 MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id);
 304
 305 static struct i2c_driver rc5t583_i2c_driver = {
 306         .driver = {
 307                    .name = "rc5t583",
 308                    },
 309         .probe = rc5t583_i2c_probe,
 310         .id_table = rc5t583_i2c_id,
 311 };
 312
 313 static int __init rc5t583_i2c_init(void)
 314 {
 315         return i2c_add_driver(&rc5t583_i2c_driver);
 316 }
 317 subsys_initcall(rc5t583_i2c_init);
 318
 319 static void __exit rc5t583_i2c_exit(void)
 320 {
 321         i2c_del_driver(&rc5t583_i2c_driver);
 322 }
 323
 324 module_exit(rc5t583_i2c_exit);
 325
 326 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 327 MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver");
 328 MODULE_LICENSE("GPL v2");