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