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_GPIO_IN, BD9571MWV_GPIO_IN),
  61         regmap_reg_range(BD9571MWV_GPIO_INT, BD9571MWV_GPIO_INT),
  62         regmap_reg_range(BD9571MWV_INT_INTREQ, BD9571MWV_INT_INTREQ),
  63 };
  64
  65 static const struct regmap_access_table bd9571mwv_volatile_table = {
  66         .yes_ranges     = bd9571mwv_volatile_yes_ranges,
  67         .n_yes_ranges   = ARRAY_SIZE(bd9571mwv_volatile_yes_ranges),
  68 };
  69
  70 static const struct regmap_config bd9571mwv_regmap_config = {
  71         .reg_bits       = 8,
  72         .val_bits       = 8,
  73         .cache_type     = REGCACHE_RBTREE,
  74         .rd_table       = &bd9571mwv_readable_table,
  75         .wr_table       = &bd9571mwv_writable_table,
  76         .volatile_table = &bd9571mwv_volatile_table,
  77         .max_register   = 0xff,
  78 };
  79
  80 static const struct regmap_irq bd9571mwv_irqs[] = {
  81         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD1, 0,
  82                        BD9571MWV_INT_INTREQ_MD1_INT),
  83         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E1, 0,
  84                        BD9571MWV_INT_INTREQ_MD2_E1_INT),
  85         REGMAP_IRQ_REG(BD9571MWV_IRQ_MD2_E2, 0,
  86                        BD9571MWV_INT_INTREQ_MD2_E2_INT),
  87         REGMAP_IRQ_REG(BD9571MWV_IRQ_PROT_ERR, 0,
  88                        BD9571MWV_INT_INTREQ_PROT_ERR_INT),
  89         REGMAP_IRQ_REG(BD9571MWV_IRQ_GP, 0,
  90                        BD9571MWV_INT_INTREQ_GP_INT),
  91         REGMAP_IRQ_REG(BD9571MWV_IRQ_128H_OF, 0,
  92                        BD9571MWV_INT_INTREQ_128H_OF_INT),
  93         REGMAP_IRQ_REG(BD9571MWV_IRQ_WDT_OF, 0,
  94                        BD9571MWV_INT_INTREQ_WDT_OF_INT),
  95         REGMAP_IRQ_REG(BD9571MWV_IRQ_BKUP_TRG, 0,
  96                        BD9571MWV_INT_INTREQ_BKUP_TRG_INT),
  97 };
  98
  99 static struct regmap_irq_chip bd9571mwv_irq_chip = {
 100         .name           = "bd9571mwv",
 101         .status_base    = BD9571MWV_INT_INTREQ,
 102         .mask_base      = BD9571MWV_INT_INTMASK,
 103         .ack_base       = BD9571MWV_INT_INTREQ,
 104         .init_ack_masked = true,
 105         .num_regs       = 1,
 106         .irqs           = bd9571mwv_irqs,
 107         .num_irqs       = ARRAY_SIZE(bd9571mwv_irqs),
 108 };
 109
 110 static int bd9571mwv_identify(struct bd9571mwv *bd)
 111 {
 112         struct device *dev = bd->dev;
 113         unsigned int value;
 114         int ret;
 115
 116         ret = regmap_read(bd->regmap, BD9571MWV_VENDOR_CODE, &value);
 117         if (ret) {
 118                 dev_err(dev, "Failed to read vendor code register (ret=%i)\n",
 119                         ret);
 120                 return ret;
 121         }
 122
 123         if (value != BD9571MWV_VENDOR_CODE_VAL) {
 124                 dev_err(dev, "Invalid vendor code ID %02x (expected %02x)\n",
 125                         value, BD9571MWV_VENDOR_CODE_VAL);
 126                 return -EINVAL;
 127         }
 128
 129         ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_CODE, &value);
 130         if (ret) {
 131                 dev_err(dev, "Failed to read product code register (ret=%i)\n",
 132                         ret);
 133                 return ret;
 134         }
 135
 136         if (value != BD9571MWV_PRODUCT_CODE_VAL) {
 137                 dev_err(dev, "Invalid product code ID %02x (expected %02x)\n",
 138                         value, BD9571MWV_PRODUCT_CODE_VAL);
 139                 return -EINVAL;
 140         }
 141
 142         ret = regmap_read(bd->regmap, BD9571MWV_PRODUCT_REVISION, &value);
 143         if (ret) {
 144                 dev_err(dev, "Failed to read revision register (ret=%i)\n",
 145                         ret);
 146                 return ret;
 147         }
 148
 149         dev_info(dev, "Device: BD9571MWV rev. %d\n", value & 0xff);
 150
 151         return 0;
 152 }
 153
 154 static int bd9571mwv_probe(struct i2c_client *client,
 155                           const struct i2c_device_id *ids)
 156 {
 157         struct bd9571mwv *bd;
 158         int ret;
 159
 160         bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
 161         if (!bd)
 162                 return -ENOMEM;
 163
 164         i2c_set_clientdata(client, bd);
 165         bd->dev = &client->dev;
 166         bd->irq = client->irq;
 167
 168         bd->regmap = devm_regmap_init_i2c(client, &bd9571mwv_regmap_config);
 169         if (IS_ERR(bd->regmap)) {
 170                 dev_err(bd->dev, "Failed to initialize register map\n");
 171                 return PTR_ERR(bd->regmap);
 172         }
 173
 174         ret = bd9571mwv_identify(bd);
 175         if (ret)
 176                 return ret;
 177
 178         ret = regmap_add_irq_chip(bd->regmap, bd->irq, IRQF_ONESHOT, 0,
 179                                   &bd9571mwv_irq_chip, &bd->irq_data);
 180         if (ret) {
 181                 dev_err(bd->dev, "Failed to register IRQ chip\n");
 182                 return ret;
 183         }
 184
 185         ret = mfd_add_devices(bd->dev, PLATFORM_DEVID_AUTO, bd9571mwv_cells,
 186                               ARRAY_SIZE(bd9571mwv_cells), NULL, 0,
 187                               regmap_irq_get_domain(bd->irq_data));
 188         if (ret) {
 189                 regmap_del_irq_chip(bd->irq, bd->irq_data);
 190                 return ret;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static int bd9571mwv_remove(struct i2c_client *client)
 197 {
 198         struct bd9571mwv *bd = i2c_get_clientdata(client);
 199
 200         regmap_del_irq_chip(bd->irq, bd->irq_data);
 201
 202         return 0;
 203 }
 204
 205 static const struct of_device_id bd9571mwv_of_match_table[] = {
 206         { .compatible = "rohm,bd9571mwv", },
 207         { /* sentinel */ }
 208 };
 209 MODULE_DEVICE_TABLE(of, bd9571mwv_of_match_table);
 210
 211 static const struct i2c_device_id bd9571mwv_id_table[] = {
 212         { "bd9571mwv", 0 },
 213         { /* sentinel */ }
 214 };
 215 MODULE_DEVICE_TABLE(i2c, bd9571mwv_id_table);
 216
 217 static struct i2c_driver bd9571mwv_driver = {
 218         .driver         = {
 219                 .name   = "bd9571mwv",
 220                 .of_match_table = bd9571mwv_of_match_table,
 221         },
 222         .probe          = bd9571mwv_probe,
 223         .remove         = bd9571mwv_remove,
 224         .id_table       = bd9571mwv_id_table,
 225 };
 226 module_i2c_driver(bd9571mwv_driver);
 227
 228 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
 229 MODULE_DESCRIPTION("BD9571MWV PMIC Driver");
 230 MODULE_LICENSE("GPL v2");