drivers/mfd/stpmic1.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) STMicroelectronics 2018
   3 // Author: Pascal Paillet <p.paillet@st.com>
   4
   5 #include <linux/i2c.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/mfd/core.h>
   8 #include <linux/mfd/stpmic1.h>
   9 #include <linux/module.h>
  10 #include <linux/reboot.h>
  11 #include <linux/of.h>
  12 #include <linux/of_irq.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/pm_wakeirq.h>
  15 #include <linux/regmap.h>
  16
  17 #include <dt-bindings/mfd/st,stpmic1.h>
  18
  19 #define STPMIC1_MAIN_IRQ 0
  20
  21 static const struct regmap_range stpmic1_readable_ranges[] = {
  22         regmap_reg_range(TURN_ON_SR, VERSION_SR),
  23         regmap_reg_range(MAIN_CR, LDO6_STDBY_CR),
  24         regmap_reg_range(BST_SW_CR, BST_SW_CR),
  25         regmap_reg_range(INT_PENDING_R1, INT_PENDING_R4),
  26         regmap_reg_range(INT_CLEAR_R1, INT_CLEAR_R4),
  27         regmap_reg_range(INT_MASK_R1, INT_MASK_R4),
  28         regmap_reg_range(INT_SET_MASK_R1, INT_SET_MASK_R4),
  29         regmap_reg_range(INT_CLEAR_MASK_R1, INT_CLEAR_MASK_R4),
  30         regmap_reg_range(INT_SRC_R1, INT_SRC_R1),
  31 };
  32
  33 static const struct regmap_range stpmic1_writeable_ranges[] = {
  34         regmap_reg_range(MAIN_CR, LDO6_STDBY_CR),
  35         regmap_reg_range(BST_SW_CR, BST_SW_CR),
  36         regmap_reg_range(INT_CLEAR_R1, INT_CLEAR_R4),
  37         regmap_reg_range(INT_SET_MASK_R1, INT_SET_MASK_R4),
  38         regmap_reg_range(INT_CLEAR_MASK_R1, INT_CLEAR_MASK_R4),
  39 };
  40
  41 static const struct regmap_range stpmic1_volatile_ranges[] = {
  42         regmap_reg_range(TURN_ON_SR, VERSION_SR),
  43         regmap_reg_range(WCHDG_CR, WCHDG_CR),
  44         regmap_reg_range(INT_PENDING_R1, INT_PENDING_R4),
  45         regmap_reg_range(INT_SRC_R1, INT_SRC_R4),
  46 };
  47
  48 static const struct regmap_access_table stpmic1_readable_table = {
  49         .yes_ranges = stpmic1_readable_ranges,
  50         .n_yes_ranges = ARRAY_SIZE(stpmic1_readable_ranges),
  51 };
  52
  53 static const struct regmap_access_table stpmic1_writeable_table = {
  54         .yes_ranges = stpmic1_writeable_ranges,
  55         .n_yes_ranges = ARRAY_SIZE(stpmic1_writeable_ranges),
  56 };
  57
  58 static const struct regmap_access_table stpmic1_volatile_table = {
  59         .yes_ranges = stpmic1_volatile_ranges,
  60         .n_yes_ranges = ARRAY_SIZE(stpmic1_volatile_ranges),
  61 };
  62
  63 static const struct regmap_config stpmic1_regmap_config = {
  64         .reg_bits = 8,
  65         .val_bits = 8,
  66         .cache_type = REGCACHE_MAPLE,
  67         .max_register = PMIC_MAX_REGISTER_ADDRESS,
  68         .rd_table = &stpmic1_readable_table,
  69         .wr_table = &stpmic1_writeable_table,
  70         .volatile_table = &stpmic1_volatile_table,
  71 };
  72
  73 static const struct regmap_irq stpmic1_irqs[] = {
  74         REGMAP_IRQ_REG(IT_PONKEY_F, 0, 0x01),
  75         REGMAP_IRQ_REG(IT_PONKEY_R, 0, 0x02),
  76         REGMAP_IRQ_REG(IT_WAKEUP_F, 0, 0x04),
  77         REGMAP_IRQ_REG(IT_WAKEUP_R, 0, 0x08),
  78         REGMAP_IRQ_REG(IT_VBUS_OTG_F, 0, 0x10),
  79         REGMAP_IRQ_REG(IT_VBUS_OTG_R, 0, 0x20),
  80         REGMAP_IRQ_REG(IT_SWOUT_F, 0, 0x40),
  81         REGMAP_IRQ_REG(IT_SWOUT_R, 0, 0x80),
  82
  83         REGMAP_IRQ_REG(IT_CURLIM_BUCK1, 1, 0x01),
  84         REGMAP_IRQ_REG(IT_CURLIM_BUCK2, 1, 0x02),
  85         REGMAP_IRQ_REG(IT_CURLIM_BUCK3, 1, 0x04),
  86         REGMAP_IRQ_REG(IT_CURLIM_BUCK4, 1, 0x08),
  87         REGMAP_IRQ_REG(IT_OCP_OTG, 1, 0x10),
  88         REGMAP_IRQ_REG(IT_OCP_SWOUT, 1, 0x20),
  89         REGMAP_IRQ_REG(IT_OCP_BOOST, 1, 0x40),
  90         REGMAP_IRQ_REG(IT_OVP_BOOST, 1, 0x80),
  91
  92         REGMAP_IRQ_REG(IT_CURLIM_LDO1, 2, 0x01),
  93         REGMAP_IRQ_REG(IT_CURLIM_LDO2, 2, 0x02),
  94         REGMAP_IRQ_REG(IT_CURLIM_LDO3, 2, 0x04),
  95         REGMAP_IRQ_REG(IT_CURLIM_LDO4, 2, 0x08),
  96         REGMAP_IRQ_REG(IT_CURLIM_LDO5, 2, 0x10),
  97         REGMAP_IRQ_REG(IT_CURLIM_LDO6, 2, 0x20),
  98         REGMAP_IRQ_REG(IT_SHORT_SWOTG, 2, 0x40),
  99         REGMAP_IRQ_REG(IT_SHORT_SWOUT, 2, 0x80),
 100
 101         REGMAP_IRQ_REG(IT_TWARN_F, 3, 0x01),
 102         REGMAP_IRQ_REG(IT_TWARN_R, 3, 0x02),
 103         REGMAP_IRQ_REG(IT_VINLOW_F, 3, 0x04),
 104         REGMAP_IRQ_REG(IT_VINLOW_R, 3, 0x08),
 105         REGMAP_IRQ_REG(IT_SWIN_F, 3, 0x40),
 106         REGMAP_IRQ_REG(IT_SWIN_R, 3, 0x80),
 107 };
 108
 109 static const struct regmap_irq_chip stpmic1_regmap_irq_chip = {
 110         .name = "pmic_irq",
 111         .status_base = INT_PENDING_R1,
 112         .mask_base = INT_SET_MASK_R1,
 113         .unmask_base = INT_CLEAR_MASK_R1,
 114         .mask_unmask_non_inverted = true,
 115         .ack_base = INT_CLEAR_R1,
 116         .num_regs = STPMIC1_PMIC_NUM_IRQ_REGS,
 117         .irqs = stpmic1_irqs,
 118         .num_irqs = ARRAY_SIZE(stpmic1_irqs),
 119 };
 120
 121 static int stpmic1_power_off(struct sys_off_data *data)
 122 {
 123         struct stpmic1 *ddata = data->cb_data;
 124
 125         regmap_update_bits(ddata->regmap, MAIN_CR,
 126                            SOFTWARE_SWITCH_OFF, SOFTWARE_SWITCH_OFF);
 127
 128         return NOTIFY_DONE;
 129 }
 130
 131 static int stpmic1_probe(struct i2c_client *i2c)
 132 {
 133         struct stpmic1 *ddata;
 134         struct device *dev = &i2c->dev;
 135         int ret;
 136         struct device_node *np = dev->of_node;
 137         u32 reg;
 138
 139         ddata = devm_kzalloc(dev, sizeof(struct stpmic1), GFP_KERNEL);
 140         if (!ddata)
 141                 return -ENOMEM;
 142
 143         i2c_set_clientdata(i2c, ddata);
 144         ddata->dev = dev;
 145
 146         ddata->regmap = devm_regmap_init_i2c(i2c, &stpmic1_regmap_config);
 147         if (IS_ERR(ddata->regmap))
 148                 return PTR_ERR(ddata->regmap);
 149
 150         ddata->irq = of_irq_get(np, STPMIC1_MAIN_IRQ);
 151         if (ddata->irq < 0) {
 152                 dev_err(dev, "Failed to get main IRQ: %d\n", ddata->irq);
 153                 return ddata->irq;
 154         }
 155
 156         ret = regmap_read(ddata->regmap, VERSION_SR, &reg);
 157         if (ret) {
 158                 dev_err(dev, "Unable to read PMIC version\n");
 159                 return ret;
 160         }
 161         dev_info(dev, "PMIC Chip Version: 0x%x\n", reg);
 162
 163         /* Initialize PMIC IRQ Chip & associated IRQ domains */
 164         ret = devm_regmap_add_irq_chip(dev, ddata->regmap, ddata->irq,
 165                                        IRQF_ONESHOT | IRQF_SHARED,
 166                                        0, &stpmic1_regmap_irq_chip,
 167                                        &ddata->irq_data);
 168         if (ret) {
 169                 dev_err(dev, "IRQ Chip registration failed: %d\n", ret);
 170                 return ret;
 171         }
 172
 173         ret = devm_register_sys_off_handler(ddata->dev,
 174                                             SYS_OFF_MODE_POWER_OFF,
 175                                             SYS_OFF_PRIO_DEFAULT,
 176                                             stpmic1_power_off,
 177                                             ddata);
 178         if (ret) {
 179                 dev_err(ddata->dev, "failed to register sys-off handler: %d\n", ret);
 180                 return ret;
 181         }
 182
 183         return devm_of_platform_populate(dev);
 184 }
 185
 186 static int stpmic1_suspend(struct device *dev)
 187 {
 188         struct i2c_client *i2c = to_i2c_client(dev);
 189         struct stpmic1 *pmic_dev = i2c_get_clientdata(i2c);
 190
 191         disable_irq(pmic_dev->irq);
 192
 193         return 0;
 194 }
 195
 196 static int stpmic1_resume(struct device *dev)
 197 {
 198         struct i2c_client *i2c = to_i2c_client(dev);
 199         struct stpmic1 *pmic_dev = i2c_get_clientdata(i2c);
 200         int ret;
 201
 202         ret = regcache_sync(pmic_dev->regmap);
 203         if (ret)
 204                 return ret;
 205
 206         enable_irq(pmic_dev->irq);
 207
 208         return 0;
 209 }
 210
 211 static DEFINE_SIMPLE_DEV_PM_OPS(stpmic1_pm, stpmic1_suspend, stpmic1_resume);
 212
 213 static const struct of_device_id stpmic1_of_match[] = {
 214         { .compatible = "st,stpmic1", },
 215         {},
 216 };
 217 MODULE_DEVICE_TABLE(of, stpmic1_of_match);
 218
 219 static struct i2c_driver stpmic1_driver = {
 220         .driver = {
 221                 .name = "stpmic1",
 222                 .of_match_table = stpmic1_of_match,
 223                 .pm = pm_sleep_ptr(&stpmic1_pm),
 224         },
 225         .probe = stpmic1_probe,
 226 };
 227
 228 module_i2c_driver(stpmic1_driver);
 229
 230 MODULE_DESCRIPTION("STPMIC1 PMIC Driver");
 231 MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
 232 MODULE_LICENSE("GPL v2");