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-power" }, 29 { .name = "rn5t618-regulator" }, 30 { .name = "rc5t619-rtc" }, 31 { .name = "rn5t618-wdt" }, 32 }; 33 34 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg) 35 { 36 switch (reg) { 37 case RN5T618_WATCHDOGCNT: 38 case RN5T618_DCIRQ: 39 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL: 40 case RN5T618_ADCCNT3: 41 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3: 42 case RN5T618_IR_GPR: 43 case RN5T618_IR_GPF: 44 case RN5T618_MON_IOIN: 45 case RN5T618_INTMON: 46 case RN5T618_RTC_CTRL1 ... RN5T618_RTC_CTRL2: 47 case RN5T618_RTC_SECONDS ... RN5T618_RTC_YEAR: 48 case RN5T618_CHGCTL1: 49 case RN5T618_REGISET1 ... RN5T618_REGISET2: 50 case RN5T618_CHGSTATE: 51 case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI: 52 case RN5T618_GCHGDET: 53 case RN5T618_CONTROL ... RN5T618_CC_AVEREG0: 54 return true; 55 default: 56 return false; 57 } 58 } 59 60 static const struct regmap_config rn5t618_regmap_config = { 61 .reg_bits = 8, 62 .val_bits = 8, 63 .volatile_reg = rn5t618_volatile_reg, 64 .max_register = RN5T618_MAX_REG, 65 .cache_type = REGCACHE_RBTREE, 66 }; 67 68 static const struct regmap_irq rc5t619_irqs[] = { 69 REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)), 70 REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)), 71 REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)), 72 REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)), 73 REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)), 74 REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)), 75 }; 76 77 static const struct regmap_irq_chip rc5t619_irq_chip = { 78 .name = "rc5t619", 79 .irqs = rc5t619_irqs, 80 .num_irqs = ARRAY_SIZE(rc5t619_irqs), 81 .num_regs = 1, 82 .status_base = RN5T618_INTMON, 83 .unmask_base = RN5T618_INTEN, 84 }; 85 86 static struct i2c_client *rn5t618_pm_power_off; 87 static struct notifier_block rn5t618_restart_handler; 88 89 static int rn5t618_irq_init(struct rn5t618 *rn5t618) 90 { 91 const struct regmap_irq_chip *irq_chip = NULL; 92 int ret; 93 94 if (!rn5t618->irq) 95 return 0; 96 97 switch (rn5t618->variant) { 98 case RC5T619: 99 irq_chip = &rc5t619_irq_chip; 100 break; 101 default: 102 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n", 103 (int)rn5t618->variant); 104 return -ENOENT; 105 } 106 107 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap, 108 rn5t618->irq, 109 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 110 0, irq_chip, &rn5t618->irq_data); 111 if (ret) 112 dev_err(rn5t618->dev, "Failed to register IRQ chip\n"); 113 114 return ret; 115 } 116 117 static void rn5t618_trigger_poweroff_sequence(bool repower) 118 { 119 int ret; 120 121 /* disable automatic repower-on */ 122 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT); 123 if (ret < 0) 124 goto err; 125 126 ret &= ~RN5T618_REPCNT_REPWRON; 127 if (repower) 128 ret |= RN5T618_REPCNT_REPWRON; 129 130 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off, 131 RN5T618_REPCNT, (u8)ret); 132 if (ret < 0) 133 goto err; 134 135 /* start power-off sequence */ 136 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT); 137 if (ret < 0) 138 goto err; 139 140 ret |= RN5T618_SLPCNT_SWPWROFF; 141 142 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off, 143 RN5T618_SLPCNT, (u8)ret); 144 if (ret < 0) 145 goto err; 146 147 return; 148 149 err: 150 dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret); 151 } 152 153 static void rn5t618_power_off(void) 154 { 155 rn5t618_trigger_poweroff_sequence(false); 156 } 157 158 static int rn5t618_restart(struct notifier_block *this, 159 unsigned long mode, void *cmd) 160 { 161 rn5t618_trigger_poweroff_sequence(true); 162 163 /* 164 * Re-power factor detection on PMIC side is not instant. 1ms 165 * proved to be enough time until reset takes effect. 166 */ 167 mdelay(1); 168 169 return NOTIFY_DONE; 170 } 171 172 static const struct of_device_id rn5t618_of_match[] = { 173 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 }, 174 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 }, 175 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 }, 176 { } 177 }; 178 MODULE_DEVICE_TABLE(of, rn5t618_of_match); 179 180 static int rn5t618_i2c_probe(struct i2c_client *i2c) 181 { 182 const struct of_device_id *of_id; 183 struct rn5t618 *priv; 184 int ret; 185 186 of_id = of_match_device(rn5t618_of_match, &i2c->dev); 187 if (!of_id) { 188 dev_err(&i2c->dev, "Failed to find matching DT ID\n"); 189 return -EINVAL; 190 } 191 192 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); 193 if (!priv) 194 return -ENOMEM; 195 196 i2c_set_clientdata(i2c, priv); 197 priv->variant = (long)of_id->data; 198 priv->irq = i2c->irq; 199 priv->dev = &i2c->dev; 200 201 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config); 202 if (IS_ERR(priv->regmap)) { 203 ret = PTR_ERR(priv->regmap); 204 dev_err(&i2c->dev, "regmap init failed: %d\n", ret); 205 return ret; 206 } 207 208 if (priv->variant == RC5T619) 209 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, 210 rc5t619_cells, 211 ARRAY_SIZE(rc5t619_cells), 212 NULL, 0, NULL); 213 else 214 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, 215 rn5t618_cells, 216 ARRAY_SIZE(rn5t618_cells), 217 NULL, 0, NULL); 218 if (ret) { 219 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret); 220 return ret; 221 } 222 223 rn5t618_pm_power_off = i2c; 224 if (of_device_is_system_power_controller(i2c->dev.of_node)) { 225 if (!pm_power_off) 226 pm_power_off = rn5t618_power_off; 227 else 228 dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); 229 } 230 231 rn5t618_restart_handler.notifier_call = rn5t618_restart; 232 rn5t618_restart_handler.priority = 192; 233 234 ret = register_restart_handler(&rn5t618_restart_handler); 235 if (ret) { 236 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret); 237 return ret; 238 } 239 240 return rn5t618_irq_init(priv); 241 } 242 243 static void rn5t618_i2c_remove(struct i2c_client *i2c) 244 { 245 if (i2c == rn5t618_pm_power_off) { 246 rn5t618_pm_power_off = NULL; 247 pm_power_off = NULL; 248 } 249 250 unregister_restart_handler(&rn5t618_restart_handler); 251 } 252 253 static int __maybe_unused rn5t618_i2c_suspend(struct device *dev) 254 { 255 struct rn5t618 *priv = dev_get_drvdata(dev); 256 257 if (priv->irq) 258 disable_irq(priv->irq); 259 260 return 0; 261 } 262 263 static int __maybe_unused rn5t618_i2c_resume(struct device *dev) 264 { 265 struct rn5t618 *priv = dev_get_drvdata(dev); 266 267 if (priv->irq) 268 enable_irq(priv->irq); 269 270 return 0; 271 } 272 273 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops, 274 rn5t618_i2c_suspend, 275 rn5t618_i2c_resume); 276 277 static struct i2c_driver rn5t618_i2c_driver = { 278 .driver = { 279 .name = "rn5t618", 280 .of_match_table = of_match_ptr(rn5t618_of_match), 281 .pm = &rn5t618_i2c_dev_pm_ops, 282 }, 283 .probe = rn5t618_i2c_probe, 284 .remove = rn5t618_i2c_remove, 285 }; 286 287 module_i2c_driver(rn5t618_i2c_driver); 288 289 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); 290 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver"); 291 MODULE_LICENSE("GPL v2"); 292