linux/drivers/mfd/rc5t583.c
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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/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
  38struct 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
  49static 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
  77static struct mfd_cell rc5t583_subdevs[] = {
  78        {.name = "rc5t583-gpio",},
  79        {.name = "rc5t583-regulator",},
  80        {.name = "rc5t583-rtc",      },
  81        {.name = "rc5t583-key",      }
  82};
  83
  84static 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
 132static 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
 148int 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}
 163EXPORT_SYMBOL(rc5t583_ext_power_req_config);
 164
 165static 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
 197static 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
 240static 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
 249static int __devinit 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 = i2c->dev.platform_data;
 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
 300err_add_devs:
 301        if (irq_init_success)
 302                rc5t583_irq_exit(rc5t583);
 303        return ret;
 304}
 305
 306static int  __devexit 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
 315static const struct i2c_device_id rc5t583_i2c_id[] = {
 316        {.name = "rc5t583", .driver_data = 0},
 317        {}
 318};
 319
 320MODULE_DEVICE_TABLE(i2c, rc5t583_i2c_id);
 321
 322static struct i2c_driver rc5t583_i2c_driver = {
 323        .driver = {
 324                   .name = "rc5t583",
 325                   .owner = THIS_MODULE,
 326                   },
 327        .probe = rc5t583_i2c_probe,
 328        .remove = __devexit_p(rc5t583_i2c_remove),
 329        .id_table = rc5t583_i2c_id,
 330};
 331
 332static int __init rc5t583_i2c_init(void)
 333{
 334        return i2c_add_driver(&rc5t583_i2c_driver);
 335}
 336subsys_initcall(rc5t583_i2c_init);
 337
 338static void __exit rc5t583_i2c_exit(void)
 339{
 340        i2c_del_driver(&rc5t583_i2c_driver);
 341}
 342
 343module_exit(rc5t583_i2c_exit);
 344
 345MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 346MODULE_DESCRIPTION("RICOH RC5T583 power management system device driver");
 347MODULE_LICENSE("GPL v2");
 348
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