drivers/mfd/max77686.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max77686.c - mfd core driver for the Maxim 77686/802
   4 //
   5 // Copyright (C) 2012 Samsung Electronics
   6 // Chiwoong Byun <woong.byun@samsung.com>
   7 // Jonghwa Lee <jonghwa3.lee@samsung.com>
   8 //
   9 //This driver is based on max8997.c
  10
  11 #include <linux/export.h>
  12 #include <linux/slab.h>
  13 #include <linux/i2c.h>
  14 #include <linux/irq.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/module.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/max77686.h>
  20 #include <linux/mfd/max77686-private.h>
  21 #include <linux/err.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24
  25 static const struct mfd_cell max77686_devs[] = {
  26         { .name = "max77686-pmic", },
  27         { .name = "max77686-rtc", },
  28         { .name = "max77686-clk", },
  29 };
  30
  31 static const struct mfd_cell max77802_devs[] = {
  32         { .name = "max77802-pmic", },
  33         { .name = "max77802-clk", },
  34         { .name = "max77802-rtc", },
  35 };
  36
  37 static bool max77802_pmic_is_accessible_reg(struct device *dev,
  38                                             unsigned int reg)
  39 {
  40         return reg < MAX77802_REG_PMIC_END;
  41 }
  42
  43 static bool max77802_rtc_is_accessible_reg(struct device *dev,
  44                                            unsigned int reg)
  45 {
  46         return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END);
  47 }
  48
  49 static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg)
  50 {
  51         return (max77802_pmic_is_accessible_reg(dev, reg) ||
  52                 max77802_rtc_is_accessible_reg(dev, reg));
  53 }
  54
  55 static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg)
  56 {
  57         return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 ||
  58                 reg == MAX77802_REG_INT2);
  59 }
  60
  61 static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg)
  62 {
  63         return (reg == MAX77802_RTC_INT ||
  64                 reg == MAX77802_RTC_UPDATE0 ||
  65                 reg == MAX77802_RTC_UPDATE1);
  66 }
  67
  68 static bool max77802_is_precious_reg(struct device *dev, unsigned int reg)
  69 {
  70         return (max77802_pmic_is_precious_reg(dev, reg) ||
  71                 max77802_rtc_is_precious_reg(dev, reg));
  72 }
  73
  74 static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg)
  75 {
  76         return (max77802_is_precious_reg(dev, reg) ||
  77                 reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 ||
  78                 reg == MAX77802_REG_PWRON);
  79 }
  80
  81 static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
  82 {
  83         return (max77802_rtc_is_precious_reg(dev, reg) ||
  84                 reg == MAX77802_RTC_SEC ||
  85                 reg == MAX77802_RTC_MIN ||
  86                 reg == MAX77802_RTC_HOUR ||
  87                 reg == MAX77802_RTC_WEEKDAY ||
  88                 reg == MAX77802_RTC_MONTH ||
  89                 reg == MAX77802_RTC_YEAR ||
  90                 reg == MAX77802_RTC_DATE);
  91 }
  92
  93 static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg)
  94 {
  95         return (max77802_pmic_is_volatile_reg(dev, reg) ||
  96                 max77802_rtc_is_volatile_reg(dev, reg));
  97 }
  98
  99 static const struct regmap_config max77686_regmap_config = {
 100         .reg_bits = 8,
 101         .val_bits = 8,
 102 };
 103
 104 static const struct regmap_config max77802_regmap_config = {
 105         .reg_bits = 8,
 106         .val_bits = 8,
 107         .writeable_reg = max77802_is_accessible_reg,
 108         .readable_reg = max77802_is_accessible_reg,
 109         .precious_reg = max77802_is_precious_reg,
 110         .volatile_reg = max77802_is_volatile_reg,
 111         .name = "max77802-pmic",
 112         .cache_type = REGCACHE_RBTREE,
 113 };
 114
 115 static const struct regmap_irq max77686_irqs[] = {
 116         /* INT1 interrupts */
 117         { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, },
 118         { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, },
 119         { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, },
 120         { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, },
 121         { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, },
 122         { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, },
 123         { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, },
 124         { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, },
 125         /* INT2 interrupts */
 126         { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, },
 127         { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, },
 128 };
 129
 130 static const struct regmap_irq_chip max77686_irq_chip = {
 131         .name                   = "max77686-pmic",
 132         .status_base            = MAX77686_REG_INT1,
 133         .mask_base              = MAX77686_REG_INT1MSK,
 134         .num_regs               = 2,
 135         .irqs                   = max77686_irqs,
 136         .num_irqs               = ARRAY_SIZE(max77686_irqs),
 137 };
 138
 139 static const struct regmap_irq_chip max77802_irq_chip = {
 140         .name                   = "max77802-pmic",
 141         .status_base            = MAX77802_REG_INT1,
 142         .mask_base              = MAX77802_REG_INT1MSK,
 143         .num_regs               = 2,
 144         .irqs                   = max77686_irqs, /* same masks as 77686 */
 145         .num_irqs               = ARRAY_SIZE(max77686_irqs),
 146 };
 147
 148 static const struct of_device_id max77686_pmic_dt_match[] = {
 149         {
 150                 .compatible = "maxim,max77686",
 151                 .data = (void *)TYPE_MAX77686,
 152         },
 153         {
 154                 .compatible = "maxim,max77802",
 155                 .data = (void *)TYPE_MAX77802,
 156         },
 157         { },
 158 };
 159 MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match);
 160
 161 static int max77686_i2c_probe(struct i2c_client *i2c)
 162 {
 163         struct max77686_dev *max77686 = NULL;
 164         unsigned int data;
 165         int ret = 0;
 166         const struct regmap_config *config;
 167         const struct regmap_irq_chip *irq_chip;
 168         const struct mfd_cell *cells;
 169         int n_devs;
 170
 171         max77686 = devm_kzalloc(&i2c->dev,
 172                                 sizeof(struct max77686_dev), GFP_KERNEL);
 173         if (!max77686)
 174                 return -ENOMEM;
 175
 176         i2c_set_clientdata(i2c, max77686);
 177         max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev);
 178         max77686->dev = &i2c->dev;
 179         max77686->i2c = i2c;
 180
 181         max77686->irq = i2c->irq;
 182
 183         if (max77686->type == TYPE_MAX77686) {
 184                 config = &max77686_regmap_config;
 185                 irq_chip = &max77686_irq_chip;
 186                 cells =  max77686_devs;
 187                 n_devs = ARRAY_SIZE(max77686_devs);
 188         } else {
 189                 config = &max77802_regmap_config;
 190                 irq_chip = &max77802_irq_chip;
 191                 cells =  max77802_devs;
 192                 n_devs = ARRAY_SIZE(max77802_devs);
 193         }
 194
 195         max77686->regmap = devm_regmap_init_i2c(i2c, config);
 196         if (IS_ERR(max77686->regmap)) {
 197                 ret = PTR_ERR(max77686->regmap);
 198                 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
 199                                 ret);
 200                 return ret;
 201         }
 202
 203         ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data);
 204         if (ret < 0) {
 205                 dev_err(max77686->dev,
 206                         "device not found on this channel (this is not an error)\n");
 207                 return -ENODEV;
 208         }
 209
 210         ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap,
 211                                        max77686->irq,
 212                                        IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
 213                                        IRQF_SHARED, 0, irq_chip,
 214                                        &max77686->irq_data);
 215         if (ret < 0) {
 216                 dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
 217                 return ret;
 218         }
 219
 220         ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL,
 221                                    0, NULL);
 222         if (ret < 0) {
 223                 dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
 224                 return ret;
 225         }
 226
 227         return 0;
 228 }
 229
 230 #ifdef CONFIG_PM_SLEEP
 231 static int max77686_suspend(struct device *dev)
 232 {
 233         struct i2c_client *i2c = to_i2c_client(dev);
 234         struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
 235
 236         if (device_may_wakeup(dev))
 237                 enable_irq_wake(max77686->irq);
 238
 239         /*
 240          * IRQ must be disabled during suspend because if it happens
 241          * while suspended it will be handled before resuming I2C.
 242          *
 243          * When device is woken up from suspend (e.g. by RTC wake alarm),
 244          * an interrupt occurs before resuming I2C bus controller.
 245          * Interrupt handler tries to read registers but this read
 246          * will fail because I2C is still suspended.
 247          */
 248         disable_irq(max77686->irq);
 249
 250         return 0;
 251 }
 252
 253 static int max77686_resume(struct device *dev)
 254 {
 255         struct i2c_client *i2c = to_i2c_client(dev);
 256         struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
 257
 258         if (device_may_wakeup(dev))
 259                 disable_irq_wake(max77686->irq);
 260
 261         enable_irq(max77686->irq);
 262
 263         return 0;
 264 }
 265 #endif /* CONFIG_PM_SLEEP */
 266
 267 static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);
 268
 269 static struct i2c_driver max77686_i2c_driver = {
 270         .driver = {
 271                    .name = "max77686",
 272                    .pm = &max77686_pm,
 273                    .of_match_table = max77686_pmic_dt_match,
 274         },
 275         .probe_new = max77686_i2c_probe,
 276 };
 277
 278 module_i2c_driver(max77686_i2c_driver);
 279
 280 MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver");
 281 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
 282 MODULE_LICENSE("GPL");