1 /* 2 * max14577.c - mfd core driver for the Maxim 14577 3 * 4 * Copyright (C) 2013 Samsung Electrnoics 5 * Chanwoo Choi <cw00.choi@samsung.com> 6 * Krzysztof Kozlowski <k.kozlowski@samsung.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * This driver is based on max8997.c 19 */ 20 21 #include <linux/module.h> 22 #include <linux/interrupt.h> 23 #include <linux/mfd/core.h> 24 #include <linux/mfd/max14577.h> 25 #include <linux/mfd/max14577-private.h> 26 27 static struct mfd_cell max14577_devs[] = { 28 { .name = "max14577-muic", }, 29 { 30 .name = "max14577-regulator", 31 .of_compatible = "maxim,max14577-regulator", 32 }, 33 { .name = "max14577-charger", }, 34 }; 35 36 static bool max14577_volatile_reg(struct device *dev, unsigned int reg) 37 { 38 switch (reg) { 39 case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3: 40 return true; 41 default: 42 break; 43 } 44 return false; 45 } 46 47 static const struct regmap_config max14577_regmap_config = { 48 .reg_bits = 8, 49 .val_bits = 8, 50 .volatile_reg = max14577_volatile_reg, 51 .max_register = MAX14577_REG_END, 52 }; 53 54 static const struct regmap_irq max14577_irqs[] = { 55 /* INT1 interrupts */ 56 { .reg_offset = 0, .mask = INT1_ADC_MASK, }, 57 { .reg_offset = 0, .mask = INT1_ADCLOW_MASK, }, 58 { .reg_offset = 0, .mask = INT1_ADCERR_MASK, }, 59 /* INT2 interrupts */ 60 { .reg_offset = 1, .mask = INT2_CHGTYP_MASK, }, 61 { .reg_offset = 1, .mask = INT2_CHGDETRUN_MASK, }, 62 { .reg_offset = 1, .mask = INT2_DCDTMR_MASK, }, 63 { .reg_offset = 1, .mask = INT2_DBCHG_MASK, }, 64 { .reg_offset = 1, .mask = INT2_VBVOLT_MASK, }, 65 /* INT3 interrupts */ 66 { .reg_offset = 2, .mask = INT3_EOC_MASK, }, 67 { .reg_offset = 2, .mask = INT3_CGMBC_MASK, }, 68 { .reg_offset = 2, .mask = INT3_OVP_MASK, }, 69 { .reg_offset = 2, .mask = INT3_MBCCHGERR_MASK, }, 70 }; 71 72 static const struct regmap_irq_chip max14577_irq_chip = { 73 .name = "max14577", 74 .status_base = MAX14577_REG_INT1, 75 .mask_base = MAX14577_REG_INTMASK1, 76 .mask_invert = 1, 77 .num_regs = 3, 78 .irqs = max14577_irqs, 79 .num_irqs = ARRAY_SIZE(max14577_irqs), 80 }; 81 82 static int max14577_i2c_probe(struct i2c_client *i2c, 83 const struct i2c_device_id *id) 84 { 85 struct max14577 *max14577; 86 struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev); 87 struct device_node *np = i2c->dev.of_node; 88 u8 reg_data; 89 int ret = 0; 90 91 if (np) { 92 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL); 93 if (!pdata) 94 return -ENOMEM; 95 i2c->dev.platform_data = pdata; 96 } 97 98 if (!pdata) { 99 dev_err(&i2c->dev, "No platform data found: %ld\n", 100 PTR_ERR(pdata)); 101 return -EINVAL; 102 } 103 104 max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL); 105 if (!max14577) 106 return -ENOMEM; 107 108 i2c_set_clientdata(i2c, max14577); 109 max14577->dev = &i2c->dev; 110 max14577->i2c = i2c; 111 max14577->irq = i2c->irq; 112 113 max14577->regmap = devm_regmap_init_i2c(i2c, &max14577_regmap_config); 114 if (IS_ERR(max14577->regmap)) { 115 ret = PTR_ERR(max14577->regmap); 116 dev_err(max14577->dev, "Failed to allocate register map: %d\n", 117 ret); 118 return ret; 119 } 120 121 ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID, 122 ®_data); 123 if (ret) { 124 dev_err(max14577->dev, "Device not found on this channel: %d\n", 125 ret); 126 return ret; 127 } 128 max14577->vendor_id = ((reg_data & DEVID_VENDORID_MASK) >> 129 DEVID_VENDORID_SHIFT); 130 max14577->device_id = ((reg_data & DEVID_DEVICEID_MASK) >> 131 DEVID_DEVICEID_SHIFT); 132 dev_info(max14577->dev, "Device ID: 0x%x, vendor: 0x%x\n", 133 max14577->device_id, max14577->vendor_id); 134 135 ret = regmap_add_irq_chip(max14577->regmap, max14577->irq, 136 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 0, 137 &max14577_irq_chip, 138 &max14577->irq_data); 139 if (ret != 0) { 140 dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n", 141 max14577->irq, ret); 142 return ret; 143 } 144 145 ret = mfd_add_devices(max14577->dev, -1, max14577_devs, 146 ARRAY_SIZE(max14577_devs), NULL, 0, 147 regmap_irq_get_domain(max14577->irq_data)); 148 if (ret < 0) 149 goto err_mfd; 150 151 device_init_wakeup(max14577->dev, 1); 152 153 return 0; 154 155 err_mfd: 156 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 157 158 return ret; 159 } 160 161 static int max14577_i2c_remove(struct i2c_client *i2c) 162 { 163 struct max14577 *max14577 = i2c_get_clientdata(i2c); 164 165 mfd_remove_devices(max14577->dev); 166 regmap_del_irq_chip(max14577->irq, max14577->irq_data); 167 168 return 0; 169 } 170 171 static const struct i2c_device_id max14577_i2c_id[] = { 172 { "max14577", 0 }, 173 { } 174 }; 175 MODULE_DEVICE_TABLE(i2c, max14577_i2c_id); 176 177 static int max14577_suspend(struct device *dev) 178 { 179 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 180 struct max14577 *max14577 = i2c_get_clientdata(i2c); 181 182 if (device_may_wakeup(dev)) { 183 enable_irq_wake(max14577->irq); 184 /* 185 * MUIC IRQ must be disabled during suspend if this is 186 * a wake up source because it will be handled before 187 * resuming I2C. 188 * 189 * When device is woken up from suspend (e.g. by ADC change), 190 * an interrupt occurs before resuming I2C bus controller. 191 * Interrupt handler tries to read registers but this read 192 * will fail because I2C is still suspended. 193 */ 194 disable_irq(max14577->irq); 195 } 196 197 return 0; 198 } 199 200 static int max14577_resume(struct device *dev) 201 { 202 struct i2c_client *i2c = container_of(dev, struct i2c_client, dev); 203 struct max14577 *max14577 = i2c_get_clientdata(i2c); 204 205 if (device_may_wakeup(dev)) { 206 disable_irq_wake(max14577->irq); 207 enable_irq(max14577->irq); 208 } 209 210 return 0; 211 } 212 213 static struct of_device_id max14577_dt_match[] = { 214 { .compatible = "maxim,max14577", }, 215 {}, 216 }; 217 218 static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume); 219 220 static struct i2c_driver max14577_i2c_driver = { 221 .driver = { 222 .name = "max14577", 223 .owner = THIS_MODULE, 224 .pm = &max14577_pm, 225 .of_match_table = of_match_ptr(max14577_dt_match), 226 }, 227 .probe = max14577_i2c_probe, 228 .remove = max14577_i2c_remove, 229 .id_table = max14577_i2c_id, 230 }; 231 232 static int __init max14577_i2c_init(void) 233 { 234 return i2c_add_driver(&max14577_i2c_driver); 235 } 236 subsys_initcall(max14577_i2c_init); 237 238 static void __exit max14577_i2c_exit(void) 239 { 240 i2c_del_driver(&max14577_i2c_driver); 241 } 242 module_exit(max14577_i2c_exit); 243 244 MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <k.kozlowski@samsung.com>"); 245 MODULE_DESCRIPTION("MAXIM 14577 multi-function core driver"); 246 MODULE_LICENSE("GPL"); 247