drivers/mfd/lp8788.c

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