drivers/mfd/bd9571mwv.c

   1 /*
   2  * ROHM BD9571MWV-M MFD driver
   3  *
   4  * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether expressed or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.
  14  *
  15  * Based on the TPS65086 driver
  16  */
  17
  18 #include <linux/i2c.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/mfd/core.h>
  21 #include <linux/module.h>
  22
  23 #include <linux/mfd/bd9571mwv.h>
  24
  25 static const struct mfd_cell bd9571mwv_cells[] = {
  26         { .name = "bd9571mwv-regulator", },
  27         { .name = "bd9571mwv-gpio", },
  28 };
  29
  30 static const struct regmap_range bd9571mwv_readable_yes_ranges[] = {
  31         regmap_reg_range(BD9571MWV_VENDOR_CODE, BD9571MWV_PRODUCT_REVISION),
  32         regmap_reg_range(BD9571MWV_AVS_SET_MONI, BD9571MWV_AVS_DVFS_VID(3)),
  33         regmap_reg_range(BD9571MWV_VD18_VID, BD9571MWV_VD33_VID),
  34         regmap_reg_range(BD9571MWV_DVFS_VINIT, BD9571MWV_DVFS_VINIT),
  35         regmap_reg_range(BD9571MWV_DVFS_SETVMAX, BD9571MWV_DVFS_MONIVDAC),
  36         regmap_reg_range(BD9571MWV_GPIO_IN, BD9571MWV_GPIO_IN),
  37         regmap_reg_range(BD9571MWV_GPIO_INT, BD9571MWV_GPIO_INTMASK),
  38         regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTMASK),
  39 };
  40
  41 static const struct regmap_access_table bd9571mwv_readable_table = {
  42         .yes_ranges     = bd9571mwv_readable_yes_ranges,
  43         .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_readable_yes_ranges),
  44 };
  45
  46 static const struct regmap_range bd9571mwv_writable_yes_ranges[] = {
  47         regmap_reg_range(BD9571MWV_AVS_VD09_VID(0), BD9571MWV_AVS_VD09_VID(3)),
  48         regmap_reg_range(BD9571MWV_DVFS_SETVID, BD9571MWV_DVFS_SETVID),
  49         regmap_reg_range(BD9571MWV_GPIO_DIR, BD9571MWV_GPIO_OUT),
  50         regmap_reg_range(BD9571MWV_GPIO_INT_SET, BD9571MWV_GPIO_INTMASK),
  51         regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTMASK),
  52 };
  53
  54 static const struct regmap_access_table bd9571mwv_writable_table = {
  55         .yes_ranges     = bd9571mwv_writable_yes_ranges,
  56         .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_writable_yes_ranges),
  57 };
  58
  59 static const struct regmap_range bd9571mwv_volatile_yes_ranges[] = {
  60         regmap_reg_range(BD9571MWV_DVFS_MONIVDAC, BD9571MWV_DVFS_MONIVDAC),
  61         regmap_reg_range(BD9571MWV_GPIO_IN, BD9571MWV_GPIO_IN),
  62         regmap_reg_range(BD9571MWV_GPIO_INT, BD9571MWV_GPIO_INT),
  63         regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTREQ),
  64 };
  65
  66 static const struct regmap_access_table bd9571mwv_volatile_table = {
  67         .yes_ranges     = bd9571mwv_volatile_yes_ranges,
  68         .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_volatile_yes_ranges),
  69 };
  70
  71 static const struct regmap_config bd9571mwv_regmap_config = {
  72         .reg_bits       = 8,
  73         .val_bits       = 8,
  74         .cache_type     = REGCACHE_RBTREE,
  75         .rd_table       = &bd9571mwv_readable_table,
  76         .wr_table       = &bd9571mwv_writable_table,
  77         .volatile_table = &bd9571mwv_volatile_table,
  78         .max_register   = 0xff,
  79 };
  80
  81 static const struct regmap_irq bd9571mwv_irqs[] = {
  82         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD1, 0,
  83                        BD9571MWV_INT_INTREQ_MD1_INT),
  84         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E1, 0,
  85                        BD9571MWV_INT_INTREQ_MD2_E1_INT),
  86         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E2, 0,
  87                        BD9571MWV_INT_INTREQ_MD2_E2_INT),
  88         REGMAP_IRQ_REG(BD9571MWV_IRQ_PROT_ERR, 0,
  89                        BD9571MWV_INT_INTREQ_PROT_ERR_INT),
  90         REGMAP_IRQ_REG(BD9571MWV_IRQ_GP, 0,
  91                        BD9571MWV_INT_INTREQ_GP_INT),
  92         REGMAP_IRQ_REG(BD9571MWV_IRQ_128H_OF, 0,
  93                        BD9571MWV_INT_INTREQ_128H_OF_INT),
  94         REGMAP_IRQ_REG(BD9571MWV_IRQ_WDT_OF, 0,
  95                        BD9571MWV_INT_INTREQ_WDT_OF_INT),
  96         REGMAP_IRQ_REG(BD9571MWV_IRQ_BKUP_TRG, 0,
  97                        BD9571MWV_INT_INTREQ_BKUP_TRG_INT),
  98 };
  99
 100 static struct regmap_irq_chip bd9571mwv_irq_chip = {
 101         .name           = "bd9571mwv",
 102         .status_base    = BD9571MWV_INT_INTREQ,
 103         .mask_base      = BD9571MWV_INT_INTMASK,
 104         .ack_base       = BD9571MWV_INT_INTREQ,
 105         .init_ack_masked = true,
 106         .num_regs       = 1,
 107         .irqs           = bd9571mwv_irqs,
 108         .num_irqs       = ARRAY_SIZE(bd9571mwv_irqs),
 109 };
 110
 111 static int bd9571mwv_identify(struct bd9571mwv *bd)
 112 {
 113         struct device *dev = bd->dev;
 114         unsigned int value;
 115         int ret;
 116
 117         ret = regmap_read(bd->regmap, BD9571MWV_VENDOR_CODE, &value);
 118         if (ret) {
 119                 dev_err(dev, "Failed to read vendor code register (ret=%i)\n",
 120                         ret);
 121                 return ret;
 122         }
 123
 124         if (value != BD9571MWV_VENDOR_CODE_VAL) {
 125                 dev_err(dev, "Invalid vendor code ID %02x (expected %02x)\n",
 126                         value, BD9571MWV_VENDOR_CODE_VAL);
 127                 return -EINVAL;
 128         }
 129
 130         ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_CODE, &value);
 131         if (ret) {
 132                 dev_err(dev, "Failed to read product code register (ret=%i)\n",
 133                         ret);
 134                 return ret;
 135         }
 136
 137         if (value != BD9571MWV_PRODUCT_CODE_VAL) {
 138                 dev_err(dev, "Invalid product code ID %02x (expected %02x)\n",
 139                         value, BD9571MWV_PRODUCT_CODE_VAL);
 140                 return -EINVAL;
 141         }
 142
 143         ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_REVISION, &value);
 144         if (ret) {
 145                 dev_err(dev, "Failed to read revision register (ret=%i)\n",
 146                         ret);
 147                 return ret;
 148         }
 149
 150         dev_info(dev, "Device: BD9571MWV rev. %d\n", value & 0xff);
 151
 152         return 0;
 153 }
 154
 155 static int bd9571mwv_probe(struct i2c_client *client,
 156                           const struct i2c_device_id *ids)
 157 {
 158         struct bd9571mwv *bd;
 159         int ret;
 160
 161         bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
 162         if (!bd)
 163                 return -ENOMEM;
 164
 165         i2c_set_clientdata(client, bd);
 166         bd->dev = &client->dev;
 167         bd->irq = client->irq;
 168
 169         bd->regmap = devm_regmap_init_i2c(client, &bd9571mwv_regmap_config);
 170         if (IS_ERR(bd->regmap)) {
 171                 dev_err(bd->dev, "Failed to initialize register map\n");
 172                 return PTR_ERR(bd->regmap);
 173         }
 174
 175         ret = bd9571mwv_identify(bd);
 176         if (ret)
 177                 return ret;
 178
 179         ret = regmap_add_irq_chip(bd->regmap, bd->irq, IRQF_ONESHOT, 0,
 180                                   &bd9571mwv_irq_chip, &bd->irq_data);
 181         if (ret) {
 182                 dev_err(bd->dev, "Failed to register IRQ chip\n");
 183                 return ret;
 184         }
 185
 186         ret = devm_mfd_add_devices(bd->dev, PLATFORM_DEVID_AUTO,
 187                                    bd9571mwv_cells, ARRAY_SIZE(bd9571mwv_cells),
 188                                    NULL, 0, regmap_irq_get_domain(bd->irq_data));
 189         if (ret) {
 190                 regmap_del_irq_chip(bd->irq, bd->irq_data);
 191                 return ret;
 192         }
 193
 194         return 0;
 195 }
 196
 197 static int bd9571mwv_remove(struct i2c_client *client)
 198 {
 199         struct bd9571mwv *bd = i2c_get_clientdata(client);
 200
 201         regmap_del_irq_chip(bd->irq, bd->irq_data);
 202
 203         return 0;
 204 }
 205
 206 static const struct of_device_id bd9571mwv_of_match_table[] = {
 207         { .compatible = "rohm,bd9571mwv", },
 208         { /* sentinel */ }
 209 };
 210 MODULE_DEVICE_TABLE(of, bd9571mwv_of_match_table);
 211
 212 static const struct i2c_device_id bd9571mwv_id_table[] = {
 213         { "bd9571mwv", 0 },
 214         { /* sentinel */ }
 215 };
 216 MODULE_DEVICE_TABLE(i2c, bd9571mwv_id_table);
 217
 218 static struct i2c_driver bd9571mwv_driver = {
 219         .driver         = {
 220                 .name   = "bd9571mwv",
 221                 .of_match_table = bd9571mwv_of_match_table,
 222         },
 223         .probe          = bd9571mwv_probe,
 224         .remove         = bd9571mwv_remove,
 225         .id_table       = bd9571mwv_id_table,
 226 };
 227 module_i2c_driver(bd9571mwv_driver);
 228
 229 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
 230 MODULE_DESCRIPTION("BD9571MWV PMIC Driver");
 231 MODULE_LICENSE("GPL v2");