1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MFD core driver for Ricoh RN5T618 PMIC 4 * 5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> 6 * Copyright (C) 2016 Toradex AG 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/i2c.h> 11 #include <linux/interrupt.h> 12 #include <linux/irq.h> 13 #include <linux/mfd/core.h> 14 #include <linux/mfd/rn5t618.h> 15 #include <linux/module.h> 16 #include <linux/of_device.h> 17 #include <linux/platform_device.h> 18 #include <linux/reboot.h> 19 #include <linux/regmap.h> 20 21 static const struct mfd_cell rn5t618_cells[] = { 22 { .name = "rn5t618-regulator" }, 23 { .name = "rn5t618-wdt" }, 24 }; 25 26 static const struct mfd_cell rc5t619_cells[] = { 27 { .name = "rn5t618-adc" }, 28 { .name = "rn5t618-regulator" }, 29 { .name = "rc5t619-rtc" }, 30 { .name = "rn5t618-wdt" }, 31 }; 32 33 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg) 34 { 35 switch (reg) { 36 case RN5T618_WATCHDOGCNT: 37 case RN5T618_DCIRQ: 38 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL: 39 case RN5T618_ADCCNT3: 40 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3: 41 case RN5T618_IR_GPR: 42 case RN5T618_IR_GPF: 43 case RN5T618_MON_IOIN: 44 case RN5T618_INTMON: 45 case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2: 46 case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR: 47 return true; 48 default: 49 return false; 50 } 51 } 52 53 static const struct regmap_config rn5t618_regmap_config = { 54 .reg_bits = 8, 55 .val_bits = 8, 56 .volatile_reg = rn5t618_volatile_reg, 57 .max_register = RN5T618_MAX_REG, 58 .cache_type = REGCACHE_RBTREE, 59 }; 60 61 static const struct regmap_irq rc5t619_irqs[] = { 62 REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)), 63 REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)), 64 REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)), 65 REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)), 66 REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)), 67 REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)), 68 }; 69 70 static const struct regmap_irq_chip rc5t619_irq_chip = { 71 .name = "rc5t619", 72 .irqs = rc5t619_irqs, 73 .num_irqs = ARRAY_SIZE(rc5t619_irqs), 74 .num_regs = 1, 75 .status_base = RN5T618_INTMON, 76 .mask_base = RN5T618_INTEN, 77 .mask_invert = true, 78 }; 79 80 static struct rn5t618 *rn5t618_pm_power_off; 81 static struct notifier_block rn5t618_restart_handler; 82 83 static int rn5t618_irq_init(struct rn5t618 *rn5t618) 84 { 85 const struct regmap_irq_chip *irq_chip = NULL; 86 int ret; 87 88 if (!rn5t618->irq) 89 return 0; 90 91 switch (rn5t618->variant) { 92 case RC5T619: 93 irq_chip = &rc5t619_irq_chip; 94 break; 95 default: 96 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n", 97 (int)rn5t618->variant); 98 return -ENOENT; 99 } 100 101 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap, 102 rn5t618->irq, 103 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 104 0, irq_chip, &rn5t618->irq_data); 105 if (ret) 106 dev_err(rn5t618->dev, "Failed to register IRQ chip\n"); 107 108 return ret; 109 } 110 111 static void rn5t618_trigger_poweroff_sequence(bool repower) 112 { 113 /* disable automatic repower-on */ 114 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT, 115 RN5T618_REPCNT_REPWRON, 116 repower ? RN5T618_REPCNT_REPWRON : 0); 117 /* start power-off sequence */ 118 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT, 119 RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF); 120 } 121 122 static void rn5t618_power_off(void) 123 { 124 rn5t618_trigger_poweroff_sequence(false); 125 } 126 127 static int rn5t618_restart(struct notifier_block *this, 128 unsigned long mode, void *cmd) 129 { 130 rn5t618_trigger_poweroff_sequence(true); 131 132 /* 133 * Re-power factor detection on PMIC side is not instant. 1ms 134 * proved to be enough time until reset takes effect. 135 */ 136 mdelay(1); 137 138 return NOTIFY_DONE; 139 } 140 141 static const struct of_device_id rn5t618_of_match[] = { 142 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 }, 143 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 }, 144 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 }, 145 { } 146 }; 147 MODULE_DEVICE_TABLE(of, rn5t618_of_match); 148 149 static int rn5t618_i2c_probe(struct i2c_client *i2c) 150 { 151 const struct of_device_id *of_id; 152 struct rn5t618 *priv; 153 int ret; 154 155 of_id = of_match_device(rn5t618_of_match, &i2c->dev); 156 if (!of_id) { 157 dev_err(&i2c->dev, "Failed to find matching DT ID\n"); 158 return -EINVAL; 159 } 160 161 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); 162 if (!priv) 163 return -ENOMEM; 164 165 i2c_set_clientdata(i2c, priv); 166 priv->variant = (long)of_id->data; 167 priv->irq = i2c->irq; 168 priv->dev = &i2c->dev; 169 170 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config); 171 if (IS_ERR(priv->regmap)) { 172 ret = PTR_ERR(priv->regmap); 173 dev_err(&i2c->dev, "regmap init failed: %d\n", ret); 174 return ret; 175 } 176 177 if (priv->variant == RC5T619) 178 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, 179 rc5t619_cells, 180 ARRAY_SIZE(rc5t619_cells), 181 NULL, 0, NULL); 182 else 183 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, 184 rn5t618_cells, 185 ARRAY_SIZE(rn5t618_cells), 186 NULL, 0, NULL); 187 if (ret) { 188 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret); 189 return ret; 190 } 191 192 rn5t618_pm_power_off = priv; 193 if (of_device_is_system_power_controller(i2c->dev.of_node)) { 194 if (!pm_power_off) 195 pm_power_off = rn5t618_power_off; 196 else 197 dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); 198 } 199 200 rn5t618_restart_handler.notifier_call = rn5t618_restart; 201 rn5t618_restart_handler.priority = 192; 202 203 ret = register_restart_handler(&rn5t618_restart_handler); 204 if (ret) { 205 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret); 206 return ret; 207 } 208 209 return rn5t618_irq_init(priv); 210 } 211 212 static int rn5t618_i2c_remove(struct i2c_client *i2c) 213 { 214 struct rn5t618 *priv = i2c_get_clientdata(i2c); 215 216 if (priv == rn5t618_pm_power_off) { 217 rn5t618_pm_power_off = NULL; 218 pm_power_off = NULL; 219 } 220 221 unregister_restart_handler(&rn5t618_restart_handler); 222 223 return 0; 224 } 225 226 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev) 227 { 228 struct rn5t618 *priv = dev_get_drvdata(dev); 229 230 if (priv->irq) 231 disable_irq(priv->irq); 232 233 return 0; 234 } 235 236 static int __maybe_unused rn5t618_i2c_resume(struct device *dev) 237 { 238 struct rn5t618 *priv = dev_get_drvdata(dev); 239 240 if (priv->irq) 241 enable_irq(priv->irq); 242 243 return 0; 244 } 245 246 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops, 247 rn5t618_i2c_suspend, 248 rn5t618_i2c_resume); 249 250 static struct i2c_driver rn5t618_i2c_driver = { 251 .driver = { 252 .name = "rn5t618", 253 .of_match_table = of_match_ptr(rn5t618_of_match), 254 .pm = &rn5t618_i2c_dev_pm_ops, 255 }, 256 .probe_new = rn5t618_i2c_probe, 257 .remove = rn5t618_i2c_remove, 258 }; 259 260 module_i2c_driver(rn5t618_i2c_driver); 261 262 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); 263 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver"); 264 MODULE_LICENSE("GPL v2"); 265