drivers/mfd/lp8788.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TI LP8788 MFD - core interface
   4  *
   5  * Copyright 2012 Texas Instruments
   6  *
   7  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
   8  */
   9
  10 #include <linux/err.h>
  11 #include <linux/i2c.h>
  12 #include <linux/mfd/core.h>
  13 #include <linux/mfd/lp8788.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16
  17 #define MAX_LP8788_REGISTERS            0xA2
  18
  19 #define MFD_DEV_SIMPLE(_name)                                   \
  20 {                                                               \
  21         .name = LP8788_DEV_##_name,                             \
  22 }
  23
  24 #define MFD_DEV_WITH_ID(_name, _id)                             \
  25 {                                                               \
  26         .name = LP8788_DEV_##_name,                             \
  27         .id = _id,                                              \
  28 }
  29
  30 #define MFD_DEV_WITH_RESOURCE(_name, _resource, num_resource)   \
  31 {                                                               \
  32         .name = LP8788_DEV_##_name,                             \
  33         .resources = _resource,                                 \
  34         .num_resources = num_resource,                          \
  35 }
  36
  37 static const struct resource chg_irqs[] = {
  38         /* Charger Interrupts */
  39         {
  40                 .start = LP8788_INT_CHG_INPUT_STATE,
  41                 .end   = LP8788_INT_PRECHG_TIMEOUT,
  42                 .name  = LP8788_CHG_IRQ,
  43                 .flags = IORESOURCE_IRQ,
  44         },
  45         /* Power Routing Switch Interrupts */
  46         {
  47                 .start = LP8788_INT_ENTER_SYS_SUPPORT,
  48                 .end   = LP8788_INT_EXIT_SYS_SUPPORT,
  49                 .name  = LP8788_PRSW_IRQ,
  50                 .flags = IORESOURCE_IRQ,
  51         },
  52         /* Battery Interrupts */
  53         {
  54                 .start = LP8788_INT_BATT_LOW,
  55                 .end   = LP8788_INT_NO_BATT,
  56                 .name  = LP8788_BATT_IRQ,
  57                 .flags = IORESOURCE_IRQ,
  58         },
  59 };
  60
  61 static const struct resource rtc_irqs[] = {
  62         {
  63                 .start = LP8788_INT_RTC_ALARM1,
  64                 .end   = LP8788_INT_RTC_ALARM2,
  65                 .name  = LP8788_ALM_IRQ,
  66                 .flags = IORESOURCE_IRQ,
  67         },
  68 };
  69
  70 static const struct mfd_cell lp8788_devs[] = {
  71         /* 4 bucks */
  72         MFD_DEV_WITH_ID(BUCK, 1),
  73         MFD_DEV_WITH_ID(BUCK, 2),
  74         MFD_DEV_WITH_ID(BUCK, 3),
  75         MFD_DEV_WITH_ID(BUCK, 4),
  76
  77         /* 12 digital ldos */
  78         MFD_DEV_WITH_ID(DLDO, 1),
  79         MFD_DEV_WITH_ID(DLDO, 2),
  80         MFD_DEV_WITH_ID(DLDO, 3),
  81         MFD_DEV_WITH_ID(DLDO, 4),
  82         MFD_DEV_WITH_ID(DLDO, 5),
  83         MFD_DEV_WITH_ID(DLDO, 6),
  84         MFD_DEV_WITH_ID(DLDO, 7),
  85         MFD_DEV_WITH_ID(DLDO, 8),
  86         MFD_DEV_WITH_ID(DLDO, 9),
  87         MFD_DEV_WITH_ID(DLDO, 10),
  88         MFD_DEV_WITH_ID(DLDO, 11),
  89         MFD_DEV_WITH_ID(DLDO, 12),
  90
  91         /* 10 analog ldos */
  92         MFD_DEV_WITH_ID(ALDO, 1),
  93         MFD_DEV_WITH_ID(ALDO, 2),
  94         MFD_DEV_WITH_ID(ALDO, 3),
  95         MFD_DEV_WITH_ID(ALDO, 4),
  96         MFD_DEV_WITH_ID(ALDO, 5),
  97         MFD_DEV_WITH_ID(ALDO, 6),
  98         MFD_DEV_WITH_ID(ALDO, 7),
  99         MFD_DEV_WITH_ID(ALDO, 8),
 100         MFD_DEV_WITH_ID(ALDO, 9),
 101         MFD_DEV_WITH_ID(ALDO, 10),
 102
 103         /* ADC */
 104         MFD_DEV_SIMPLE(ADC),
 105
 106         /* battery charger */
 107         MFD_DEV_WITH_RESOURCE(CHARGER, chg_irqs, ARRAY_SIZE(chg_irqs)),
 108
 109         /* rtc */
 110         MFD_DEV_WITH_RESOURCE(RTC, rtc_irqs, ARRAY_SIZE(rtc_irqs)),
 111
 112         /* backlight */
 113         MFD_DEV_SIMPLE(BACKLIGHT),
 114
 115         /* current sink for vibrator */
 116         MFD_DEV_SIMPLE(VIBRATOR),
 117
 118         /* current sink for keypad LED */
 119         MFD_DEV_SIMPLE(KEYLED),
 120 };
 121
 122 int lp8788_read_byte(struct lp8788 *lp, u8 reg, u8 *data)
 123 {
 124         int ret;
 125         unsigned int val;
 126
 127         ret = regmap_read(lp->regmap, reg, &val);
 128         if (ret < 0) {
 129                 dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
 130                 return ret;
 131         }
 132
 133         *data = (u8)val;
 134         return 0;
 135 }
 136 EXPORT_SYMBOL_GPL(lp8788_read_byte);
 137
 138 int lp8788_read_multi_bytes(struct lp8788 *lp, u8 reg, u8 *data, size_t count)
 139 {
 140         return regmap_bulk_read(lp->regmap, reg, data, count);
 141 }
 142 EXPORT_SYMBOL_GPL(lp8788_read_multi_bytes);
 143
 144 int lp8788_write_byte(struct lp8788 *lp, u8 reg, u8 data)
 145 {
 146         return regmap_write(lp->regmap, reg, data);
 147 }
 148 EXPORT_SYMBOL_GPL(lp8788_write_byte);
 149
 150 int lp8788_update_bits(struct lp8788 *lp, u8 reg, u8 mask, u8 data)
 151 {
 152         return regmap_update_bits(lp->regmap, reg, mask, data);
 153 }
 154 EXPORT_SYMBOL_GPL(lp8788_update_bits);
 155
 156 static int lp8788_platform_init(struct lp8788 *lp)
 157 {
 158         struct lp8788_platform_data *pdata = lp->pdata;
 159
 160         return (pdata && pdata->init_func) ? pdata->init_func(lp) : 0;
 161 }
 162
 163 static const struct regmap_config lp8788_regmap_config = {
 164         .reg_bits = 8,
 165         .val_bits = 8,
 166         .max_register = MAX_LP8788_REGISTERS,
 167 };
 168
 169 static int lp8788_probe(struct i2c_client *cl)
 170 {
 171         struct lp8788 *lp;
 172         struct lp8788_platform_data *pdata = dev_get_platdata(&cl->dev);
 173         int ret;
 174
 175         lp = devm_kzalloc(&cl->dev, sizeof(struct lp8788), GFP_KERNEL);
 176         if (!lp)
 177                 return -ENOMEM;
 178
 179         lp->regmap = devm_regmap_init_i2c(cl, &lp8788_regmap_config);
 180         if (IS_ERR(lp->regmap)) {
 181                 ret = PTR_ERR(lp->regmap);
 182                 dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
 183                 return ret;
 184         }
 185
 186         lp->pdata = pdata;
 187         lp->dev = &cl->dev;
 188         i2c_set_clientdata(cl, lp);
 189
 190         ret = lp8788_platform_init(lp);
 191         if (ret)
 192                 return ret;
 193
 194         ret = lp8788_irq_init(lp, cl->irq);
 195         if (ret)
 196                 return ret;
 197
 198         ret = mfd_add_devices(lp->dev, -1, lp8788_devs,
 199                               ARRAY_SIZE(lp8788_devs), NULL, 0, NULL);
 200         if (ret)
 201                 goto err_exit_irq;
 202
 203         return 0;
 204
 205 err_exit_irq:
 206         lp8788_irq_exit(lp);
 207         return ret;
 208 }
 209
 210 static void lp8788_remove(struct i2c_client *cl)
 211 {
 212         struct lp8788 *lp = i2c_get_clientdata(cl);
 213
 214         mfd_remove_devices(lp->dev);
 215         lp8788_irq_exit(lp);
 216 }
 217
 218 static const struct i2c_device_id lp8788_ids[] = {
 219         { "lp8788" },
 220         { }
 221 };
 222 MODULE_DEVICE_TABLE(i2c, lp8788_ids);
 223
 224 static struct i2c_driver lp8788_driver = {
 225         .driver = {
 226                 .name = "lp8788",
 227         },
 228         .probe = lp8788_probe,
 229         .remove = lp8788_remove,
 230         .id_table = lp8788_ids,
 231 };
 232
 233 static int __init lp8788_init(void)
 234 {
 235         return i2c_add_driver(&lp8788_driver);
 236 }
 237 subsys_initcall(lp8788_init);
 238
 239 static void __exit lp8788_exit(void)
 240 {
 241         i2c_del_driver(&lp8788_driver);
 242 }
 243 module_exit(lp8788_exit);
 244
 245 MODULE_DESCRIPTION("TI LP8788 MFD Driver");
 246 MODULE_AUTHOR("Milo Kim");