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_CHGSTATE: 49 case RN5T618_CHGCTRL_IRR ... RN5T618_CHGERR_MONI: 50 case RN5T618_CONTROL ... RN5T618_CC_AVEREG0: 51 return true; 52 default: 53 return false; 54 } 55 } 56 57 static const struct regmap_config rn5t618_regmap_config = { 58 .reg_bits = 8, 59 .val_bits = 8, 60 .volatile_reg = rn5t618_volatile_reg, 61 .max_register = RN5T618_MAX_REG, 62 .cache_type = REGCACHE_RBTREE, 63 }; 64 65 static const struct regmap_irq rc5t619_irqs[] = { 66 REGMAP_IRQ_REG(RN5T618_IRQ_SYS, 0, BIT(0)), 67 REGMAP_IRQ_REG(RN5T618_IRQ_DCDC, 0, BIT(1)), 68 REGMAP_IRQ_REG(RN5T618_IRQ_RTC, 0, BIT(2)), 69 REGMAP_IRQ_REG(RN5T618_IRQ_ADC, 0, BIT(3)), 70 REGMAP_IRQ_REG(RN5T618_IRQ_GPIO, 0, BIT(4)), 71 REGMAP_IRQ_REG(RN5T618_IRQ_CHG, 0, BIT(6)), 72 }; 73 74 static const struct regmap_irq_chip rc5t619_irq_chip = { 75 .name = "rc5t619", 76 .irqs = rc5t619_irqs, 77 .num_irqs = ARRAY_SIZE(rc5t619_irqs), 78 .num_regs = 1, 79 .status_base = RN5T618_INTMON, 80 .mask_base = RN5T618_INTEN, 81 .mask_invert = true, 82 }; 83 84 static struct i2c_client *rn5t618_pm_power_off; 85 static struct notifier_block rn5t618_restart_handler; 86 87 static int rn5t618_irq_init(struct rn5t618 *rn5t618) 88 { 89 const struct regmap_irq_chip *irq_chip = NULL; 90 int ret; 91 92 if (!rn5t618->irq) 93 return 0; 94 95 switch (rn5t618->variant) { 96 case RC5T619: 97 irq_chip = &rc5t619_irq_chip; 98 break; 99 default: 100 dev_err(rn5t618->dev, "Currently no IRQ support for variant %d\n", 101 (int)rn5t618->variant); 102 return -ENOENT; 103 } 104 105 ret = devm_regmap_add_irq_chip(rn5t618->dev, rn5t618->regmap, 106 rn5t618->irq, 107 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 108 0, irq_chip, &rn5t618->irq_data); 109 if (ret) 110 dev_err(rn5t618->dev, "Failed to register IRQ chip\n"); 111 112 return ret; 113 } 114 115 static void rn5t618_trigger_poweroff_sequence(bool repower) 116 { 117 int ret; 118 119 /* disable automatic repower-on */ 120 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_REPCNT); 121 if (ret < 0) 122 goto err; 123 124 ret &= ~RN5T618_REPCNT_REPWRON; 125 if (repower) 126 ret |= RN5T618_REPCNT_REPWRON; 127 128 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off, 129 RN5T618_REPCNT, (u8)ret); 130 if (ret < 0) 131 goto err; 132 133 /* start power-off sequence */ 134 ret = i2c_smbus_read_byte_data(rn5t618_pm_power_off, RN5T618_SLPCNT); 135 if (ret < 0) 136 goto err; 137 138 ret |= RN5T618_SLPCNT_SWPWROFF; 139 140 ret = i2c_smbus_write_byte_data(rn5t618_pm_power_off, 141 RN5T618_SLPCNT, (u8)ret); 142 if (ret < 0) 143 goto err; 144 145 return; 146 147 err: 148 dev_alert(&rn5t618_pm_power_off->dev, "Failed to shutdown (err = %d)\n", ret); 149 } 150 151 static void rn5t618_power_off(void) 152 { 153 rn5t618_trigger_poweroff_sequence(false); 154 } 155 156 static int rn5t618_restart(struct notifier_block *this, 157 unsigned long mode, void *cmd) 158 { 159 rn5t618_trigger_poweroff_sequence(true); 160 161 /* 162 * Re-power factor detection on PMIC side is not instant. 1ms 163 * proved to be enough time until reset takes effect. 164 */ 165 mdelay(1); 166 167 return NOTIFY_DONE; 168 } 169 170 static const struct of_device_id rn5t618_of_match[] = { 171 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 }, 172 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 }, 173 { .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 }, 174 { } 175 }; 176 MODULE_DEVICE_TABLE(of, rn5t618_of_match); 177 178 static int rn5t618_i2c_probe(struct i2c_client *i2c) 179 { 180 const struct of_device_id *of_id; 181 struct rn5t618 *priv; 182 int ret; 183 184 of_id = of_match_device(rn5t618_of_match, &i2c->dev); 185 if (!of_id) { 186 dev_err(&i2c->dev, "Failed to find matching DT ID\n"); 187 return -EINVAL; 188 } 189 190 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); 191 if (!priv) 192 return -ENOMEM; 193 194 i2c_set_clientdata(i2c, priv); 195 priv->variant = (long)of_id->data; 196 priv->irq = i2c->irq; 197 priv->dev = &i2c->dev; 198 199 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config); 200 if (IS_ERR(priv->regmap)) { 201 ret = PTR_ERR(priv->regmap); 202 dev_err(&i2c->dev, "regmap init failed: %d\n", ret); 203 return ret; 204 } 205 206 if (priv->variant == RC5T619) 207 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, 208 rc5t619_cells, 209 ARRAY_SIZE(rc5t619_cells), 210 NULL, 0, NULL); 211 else 212 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_NONE, 213 rn5t618_cells, 214 ARRAY_SIZE(rn5t618_cells), 215 NULL, 0, NULL); 216 if (ret) { 217 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret); 218 return ret; 219 } 220 221 rn5t618_pm_power_off = i2c; 222 if (of_device_is_system_power_controller(i2c->dev.of_node)) { 223 if (!pm_power_off) 224 pm_power_off = rn5t618_power_off; 225 else 226 dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); 227 } 228 229 rn5t618_restart_handler.notifier_call = rn5t618_restart; 230 rn5t618_restart_handler.priority = 192; 231 232 ret = register_restart_handler(&rn5t618_restart_handler); 233 if (ret) { 234 dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret); 235 return ret; 236 } 237 238 return rn5t618_irq_init(priv); 239 } 240 241 static int rn5t618_i2c_remove(struct i2c_client *i2c) 242 { 243 if (i2c == rn5t618_pm_power_off) { 244 rn5t618_pm_power_off = NULL; 245 pm_power_off = NULL; 246 } 247 248 unregister_restart_handler(&rn5t618_restart_handler); 249 250 return 0; 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_new = 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