1 /* 2 * MFD core driver for Ricoh RN5T618 PMIC 3 * 4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> 5 * Copyright (C) 2016 Toradex AG 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * version 2 as published by the Free Software Foundation. 10 * 11 * You should have received a copy of the GNU General Public License 12 * along with this program. If not, see <http://www.gnu.org/licenses/>. 13 */ 14 15 #include <linux/i2c.h> 16 #include <linux/mfd/core.h> 17 #include <linux/mfd/rn5t618.h> 18 #include <linux/module.h> 19 #include <linux/of_device.h> 20 #include <linux/regmap.h> 21 22 static const struct mfd_cell rn5t618_cells[] = { 23 { .name = "rn5t618-regulator" }, 24 { .name = "rn5t618-wdt" }, 25 }; 26 27 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg) 28 { 29 switch (reg) { 30 case RN5T618_WATCHDOGCNT: 31 case RN5T618_DCIRQ: 32 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL: 33 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3: 34 case RN5T618_IR_GPR: 35 case RN5T618_IR_GPF: 36 case RN5T618_MON_IOIN: 37 case RN5T618_INTMON: 38 return true; 39 default: 40 return false; 41 } 42 } 43 44 static const struct regmap_config rn5t618_regmap_config = { 45 .reg_bits = 8, 46 .val_bits = 8, 47 .volatile_reg = rn5t618_volatile_reg, 48 .max_register = RN5T618_MAX_REG, 49 .cache_type = REGCACHE_RBTREE, 50 }; 51 52 static struct rn5t618 *rn5t618_pm_power_off; 53 54 static void rn5t618_power_off(void) 55 { 56 /* disable automatic repower-on */ 57 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT, 58 RN5T618_REPCNT_REPWRON, 0); 59 /* start power-off sequence */ 60 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT, 61 RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF); 62 } 63 64 static const struct of_device_id rn5t618_of_match[] = { 65 { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 }, 66 { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 }, 67 { } 68 }; 69 MODULE_DEVICE_TABLE(of, rn5t618_of_match); 70 71 static int rn5t618_i2c_probe(struct i2c_client *i2c, 72 const struct i2c_device_id *id) 73 { 74 const struct of_device_id *of_id; 75 struct rn5t618 *priv; 76 int ret; 77 78 of_id = of_match_device(rn5t618_of_match, &i2c->dev); 79 if (!of_id) { 80 dev_err(&i2c->dev, "Failed to find matching DT ID\n"); 81 return -EINVAL; 82 } 83 84 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); 85 if (!priv) 86 return -ENOMEM; 87 88 i2c_set_clientdata(i2c, priv); 89 priv->variant = (long)of_id->data; 90 91 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config); 92 if (IS_ERR(priv->regmap)) { 93 ret = PTR_ERR(priv->regmap); 94 dev_err(&i2c->dev, "regmap init failed: %d\n", ret); 95 return ret; 96 } 97 98 ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells, 99 ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL); 100 if (ret) { 101 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret); 102 return ret; 103 } 104 105 if (of_device_is_system_power_controller(i2c->dev.of_node)) { 106 if (!pm_power_off) { 107 rn5t618_pm_power_off = priv; 108 pm_power_off = rn5t618_power_off; 109 } else { 110 dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); 111 } 112 } 113 114 return 0; 115 } 116 117 static int rn5t618_i2c_remove(struct i2c_client *i2c) 118 { 119 struct rn5t618 *priv = i2c_get_clientdata(i2c); 120 121 if (priv == rn5t618_pm_power_off) { 122 rn5t618_pm_power_off = NULL; 123 pm_power_off = NULL; 124 } 125 126 return 0; 127 } 128 129 static const struct i2c_device_id rn5t618_i2c_id[] = { 130 { } 131 }; 132 MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id); 133 134 static struct i2c_driver rn5t618_i2c_driver = { 135 .driver = { 136 .name = "rn5t618", 137 .of_match_table = of_match_ptr(rn5t618_of_match), 138 }, 139 .probe = rn5t618_i2c_probe, 140 .remove = rn5t618_i2c_remove, 141 .id_table = rn5t618_i2c_id, 142 }; 143 144 module_i2c_driver(rn5t618_i2c_driver); 145 146 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); 147 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver"); 148 MODULE_LICENSE("GPL v2"); 149