drivers/mfd/axp20x.c

   1 /*
   2  * axp20x.c - MFD core driver for the X-Powers AXP202 and AXP209
   3  *
   4  * AXP20x comprises an adaptive USB-Compatible PWM charger, 2 BUCK DC-DC
   5  * converters, 5 LDOs, multiple 12-bit ADCs of voltage, current and temperature
   6  * as well as 4 configurable GPIOs.
   7  *
   8  * Author: Carlo Caione <carlo@caione.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/err.h>
  16 #include <linux/i2c.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/pm_runtime.h>
  21 #include <linux/regmap.h>
  22 #include <linux/slab.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/mfd/axp20x.h>
  25 #include <linux/mfd/core.h>
  26 #include <linux/of_device.h>
  27 #include <linux/of_irq.h>
  28
  29 #define AXP20X_OFF      0x80
  30
  31 static const struct regmap_range axp20x_writeable_ranges[] = {
  32         regmap_reg_range(AXP20X_DATACACHE(0), AXP20X_IRQ5_STATE),
  33         regmap_reg_range(AXP20X_DCDC_MODE, AXP20X_FG_RES),
  34 };
  35
  36 static const struct regmap_range axp20x_volatile_ranges[] = {
  37         regmap_reg_range(AXP20X_IRQ1_EN, AXP20X_IRQ5_STATE),
  38 };
  39
  40 static const struct regmap_access_table axp20x_writeable_table = {
  41         .yes_ranges     = axp20x_writeable_ranges,
  42         .n_yes_ranges   = ARRAY_SIZE(axp20x_writeable_ranges),
  43 };
  44
  45 static const struct regmap_access_table axp20x_volatile_table = {
  46         .yes_ranges     = axp20x_volatile_ranges,
  47         .n_yes_ranges   = ARRAY_SIZE(axp20x_volatile_ranges),
  48 };
  49
  50 static struct resource axp20x_pek_resources[] = {
  51         {
  52                 .name   = "PEK_DBR",
  53                 .start  = AXP20X_IRQ_PEK_RIS_EDGE,
  54                 .end    = AXP20X_IRQ_PEK_RIS_EDGE,
  55                 .flags  = IORESOURCE_IRQ,
  56         }, {
  57                 .name   = "PEK_DBF",
  58                 .start  = AXP20X_IRQ_PEK_FAL_EDGE,
  59                 .end    = AXP20X_IRQ_PEK_FAL_EDGE,
  60                 .flags  = IORESOURCE_IRQ,
  61         },
  62 };
  63
  64 static const struct regmap_config axp20x_regmap_config = {
  65         .reg_bits       = 8,
  66         .val_bits       = 8,
  67         .wr_table       = &axp20x_writeable_table,
  68         .volatile_table = &axp20x_volatile_table,
  69         .max_register   = AXP20X_FG_RES,
  70         .cache_type     = REGCACHE_RBTREE,
  71 };
  72
  73 #define AXP20X_IRQ(_irq, _off, _mask) \
  74         [AXP20X_IRQ_##_irq] = { .reg_offset = (_off), .mask = BIT(_mask) }
  75
  76 static const struct regmap_irq axp20x_regmap_irqs[] = {
  77         AXP20X_IRQ(ACIN_OVER_V,         0, 7),
  78         AXP20X_IRQ(ACIN_PLUGIN,         0, 6),
  79         AXP20X_IRQ(ACIN_REMOVAL,        0, 5),
  80         AXP20X_IRQ(VBUS_OVER_V,         0, 4),
  81         AXP20X_IRQ(VBUS_PLUGIN,         0, 3),
  82         AXP20X_IRQ(VBUS_REMOVAL,        0, 2),
  83         AXP20X_IRQ(VBUS_V_LOW,          0, 1),
  84         AXP20X_IRQ(BATT_PLUGIN,         1, 7),
  85         AXP20X_IRQ(BATT_REMOVAL,        1, 6),
  86         AXP20X_IRQ(BATT_ENT_ACT_MODE,   1, 5),
  87         AXP20X_IRQ(BATT_EXIT_ACT_MODE,  1, 4),
  88         AXP20X_IRQ(CHARG,               1, 3),
  89         AXP20X_IRQ(CHARG_DONE,          1, 2),
  90         AXP20X_IRQ(BATT_TEMP_HIGH,      1, 1),
  91         AXP20X_IRQ(BATT_TEMP_LOW,       1, 0),
  92         AXP20X_IRQ(DIE_TEMP_HIGH,       2, 7),
  93         AXP20X_IRQ(CHARG_I_LOW,         2, 6),
  94         AXP20X_IRQ(DCDC1_V_LONG,        2, 5),
  95         AXP20X_IRQ(DCDC2_V_LONG,        2, 4),
  96         AXP20X_IRQ(DCDC3_V_LONG,        2, 3),
  97         AXP20X_IRQ(PEK_SHORT,           2, 1),
  98         AXP20X_IRQ(PEK_LONG,            2, 0),
  99         AXP20X_IRQ(N_OE_PWR_ON,         3, 7),
 100         AXP20X_IRQ(N_OE_PWR_OFF,        3, 6),
 101         AXP20X_IRQ(VBUS_VALID,          3, 5),
 102         AXP20X_IRQ(VBUS_NOT_VALID,      3, 4),
 103         AXP20X_IRQ(VBUS_SESS_VALID,     3, 3),
 104         AXP20X_IRQ(VBUS_SESS_END,       3, 2),
 105         AXP20X_IRQ(LOW_PWR_LVL1,        3, 1),
 106         AXP20X_IRQ(LOW_PWR_LVL2,        3, 0),
 107         AXP20X_IRQ(TIMER,               4, 7),
 108         AXP20X_IRQ(PEK_RIS_EDGE,        4, 6),
 109         AXP20X_IRQ(PEK_FAL_EDGE,        4, 5),
 110         AXP20X_IRQ(GPIO3_INPUT,         4, 3),
 111         AXP20X_IRQ(GPIO2_INPUT,         4, 2),
 112         AXP20X_IRQ(GPIO1_INPUT,         4, 1),
 113         AXP20X_IRQ(GPIO0_INPUT,         4, 0),
 114 };
 115
 116 static const struct of_device_id axp20x_of_match[] = {
 117         { .compatible = "x-powers,axp202", .data = (void *) AXP202_ID },
 118         { .compatible = "x-powers,axp209", .data = (void *) AXP209_ID },
 119         { },
 120 };
 121 MODULE_DEVICE_TABLE(of, axp20x_of_match);
 122
 123 /*
 124  * This is useless for OF-enabled devices, but it is needed by I2C subsystem
 125  */
 126 static const struct i2c_device_id axp20x_i2c_id[] = {
 127         { },
 128 };
 129 MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
 130
 131 static const struct regmap_irq_chip axp20x_regmap_irq_chip = {
 132         .name                   = "axp20x_irq_chip",
 133         .status_base            = AXP20X_IRQ1_STATE,
 134         .ack_base               = AXP20X_IRQ1_STATE,
 135         .mask_base              = AXP20X_IRQ1_EN,
 136         .num_regs               = 5,
 137         .irqs                   = axp20x_regmap_irqs,
 138         .num_irqs               = ARRAY_SIZE(axp20x_regmap_irqs),
 139         .mask_invert            = true,
 140         .init_ack_masked        = true,
 141 };
 142
 143 static struct mfd_cell axp20x_cells[] = {
 144         {
 145                 .name                   = "axp20x-pek",
 146                 .num_resources          = ARRAY_SIZE(axp20x_pek_resources),
 147                 .resources              = axp20x_pek_resources,
 148         }, {
 149                 .name                   = "axp20x-regulator",
 150         },
 151 };
 152
 153 static struct axp20x_dev *axp20x_pm_power_off;
 154 static void axp20x_power_off(void)
 155 {
 156         regmap_write(axp20x_pm_power_off->regmap, AXP20X_OFF_CTRL,
 157                      AXP20X_OFF);
 158 }
 159
 160 static int axp20x_i2c_probe(struct i2c_client *i2c,
 161                          const struct i2c_device_id *id)
 162 {
 163         struct axp20x_dev *axp20x;
 164         const struct of_device_id *of_id;
 165         int ret;
 166
 167         axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
 168         if (!axp20x)
 169                 return -ENOMEM;
 170
 171         of_id = of_match_device(axp20x_of_match, &i2c->dev);
 172         if (!of_id) {
 173                 dev_err(&i2c->dev, "Unable to setup AXP20X data\n");
 174                 return -ENODEV;
 175         }
 176         axp20x->variant = (long) of_id->data;
 177
 178         axp20x->i2c_client = i2c;
 179         axp20x->dev = &i2c->dev;
 180         dev_set_drvdata(axp20x->dev, axp20x);
 181
 182         axp20x->regmap = devm_regmap_init_i2c(i2c, &axp20x_regmap_config);
 183         if (IS_ERR(axp20x->regmap)) {
 184                 ret = PTR_ERR(axp20x->regmap);
 185                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 186                 return ret;
 187         }
 188
 189         ret = regmap_add_irq_chip(axp20x->regmap, i2c->irq,
 190                                   IRQF_ONESHOT | IRQF_SHARED, -1,
 191                                   &axp20x_regmap_irq_chip,
 192                                   &axp20x->regmap_irqc);
 193         if (ret) {
 194                 dev_err(&i2c->dev, "failed to add irq chip: %d\n", ret);
 195                 return ret;
 196         }
 197
 198         ret = mfd_add_devices(axp20x->dev, -1, axp20x_cells,
 199                               ARRAY_SIZE(axp20x_cells), NULL, 0, NULL);
 200
 201         if (ret) {
 202                 dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
 203                 regmap_del_irq_chip(i2c->irq, axp20x->regmap_irqc);
 204                 return ret;
 205         }
 206
 207         if (!pm_power_off) {
 208                 axp20x_pm_power_off = axp20x;
 209                 pm_power_off = axp20x_power_off;
 210         }
 211
 212         dev_info(&i2c->dev, "AXP20X driver loaded\n");
 213
 214         return 0;
 215 }
 216
 217 static int axp20x_i2c_remove(struct i2c_client *i2c)
 218 {
 219         struct axp20x_dev *axp20x = i2c_get_clientdata(i2c);
 220
 221         if (axp20x == axp20x_pm_power_off) {
 222                 axp20x_pm_power_off = NULL;
 223                 pm_power_off = NULL;
 224         }
 225
 226         mfd_remove_devices(axp20x->dev);
 227         regmap_del_irq_chip(axp20x->i2c_client->irq, axp20x->regmap_irqc);
 228
 229         return 0;
 230 }
 231
 232 static struct i2c_driver axp20x_i2c_driver = {
 233         .driver = {
 234                 .name   = "axp20x",
 235                 .owner  = THIS_MODULE,
 236                 .of_match_table = of_match_ptr(axp20x_of_match),
 237         },
 238         .probe          = axp20x_i2c_probe,
 239         .remove         = axp20x_i2c_remove,
 240         .id_table       = axp20x_i2c_id,
 241 };
 242
 243 module_i2c_driver(axp20x_i2c_driver);
 244
 245 MODULE_DESCRIPTION("PMIC MFD core driver for AXP20X");
 246 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 247 MODULE_LICENSE("GPL");