1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // max77686.c - mfd core driver for the Maxim 77686/802 4 // 5 // Copyright (C) 2012 Samsung Electronics 6 // Chiwoong Byun <woong.byun@samsung.com> 7 // Jonghwa Lee <jonghwa3.lee@samsung.com> 8 // 9 //This driver is based on max8997.c 10 11 #include <linux/export.h> 12 #include <linux/slab.h> 13 #include <linux/i2c.h> 14 #include <linux/irq.h> 15 #include <linux/interrupt.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/module.h> 18 #include <linux/mfd/core.h> 19 #include <linux/mfd/max77686.h> 20 #include <linux/mfd/max77686-private.h> 21 #include <linux/err.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 25 static const struct mfd_cell max77686_devs[] = { 26 { .name = "max77686-pmic", }, 27 { .name = "max77686-rtc", }, 28 { .name = "max77686-clk", }, 29 }; 30 31 static const struct mfd_cell max77802_devs[] = { 32 { .name = "max77802-pmic", }, 33 { .name = "max77802-clk", }, 34 { .name = "max77802-rtc", }, 35 }; 36 37 static bool max77802_pmic_is_accessible_reg(struct device *dev, 38 unsigned int reg) 39 { 40 return reg < MAX77802_REG_PMIC_END; 41 } 42 43 static bool max77802_rtc_is_accessible_reg(struct device *dev, 44 unsigned int reg) 45 { 46 return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END); 47 } 48 49 static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg) 50 { 51 return (max77802_pmic_is_accessible_reg(dev, reg) || 52 max77802_rtc_is_accessible_reg(dev, reg)); 53 } 54 55 static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg) 56 { 57 return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 || 58 reg == MAX77802_REG_INT2); 59 } 60 61 static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg) 62 { 63 return (reg == MAX77802_RTC_INT || 64 reg == MAX77802_RTC_UPDATE0 || 65 reg == MAX77802_RTC_UPDATE1); 66 } 67 68 static bool max77802_is_precious_reg(struct device *dev, unsigned int reg) 69 { 70 return (max77802_pmic_is_precious_reg(dev, reg) || 71 max77802_rtc_is_precious_reg(dev, reg)); 72 } 73 74 static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg) 75 { 76 return (max77802_is_precious_reg(dev, reg) || 77 reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 || 78 reg == MAX77802_REG_PWRON); 79 } 80 81 static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg) 82 { 83 return (max77802_rtc_is_precious_reg(dev, reg) || 84 reg == MAX77802_RTC_SEC || 85 reg == MAX77802_RTC_MIN || 86 reg == MAX77802_RTC_HOUR || 87 reg == MAX77802_RTC_WEEKDAY || 88 reg == MAX77802_RTC_MONTH || 89 reg == MAX77802_RTC_YEAR || 90 reg == MAX77802_RTC_DATE); 91 } 92 93 static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg) 94 { 95 return (max77802_pmic_is_volatile_reg(dev, reg) || 96 max77802_rtc_is_volatile_reg(dev, reg)); 97 } 98 99 static const struct regmap_config max77686_regmap_config = { 100 .reg_bits = 8, 101 .val_bits = 8, 102 }; 103 104 static const struct regmap_config max77802_regmap_config = { 105 .reg_bits = 8, 106 .val_bits = 8, 107 .writeable_reg = max77802_is_accessible_reg, 108 .readable_reg = max77802_is_accessible_reg, 109 .precious_reg = max77802_is_precious_reg, 110 .volatile_reg = max77802_is_volatile_reg, 111 .name = "max77802-pmic", 112 .cache_type = REGCACHE_RBTREE, 113 }; 114 115 static const struct regmap_irq max77686_irqs[] = { 116 /* INT1 interrupts */ 117 { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, }, 118 { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, }, 119 { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, }, 120 { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, }, 121 { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, }, 122 { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, }, 123 { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, }, 124 { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, }, 125 /* INT2 interrupts */ 126 { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, }, 127 { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, }, 128 }; 129 130 static const struct regmap_irq_chip max77686_irq_chip = { 131 .name = "max77686-pmic", 132 .status_base = MAX77686_REG_INT1, 133 .mask_base = MAX77686_REG_INT1MSK, 134 .num_regs = 2, 135 .irqs = max77686_irqs, 136 .num_irqs = ARRAY_SIZE(max77686_irqs), 137 }; 138 139 static const struct regmap_irq_chip max77802_irq_chip = { 140 .name = "max77802-pmic", 141 .status_base = MAX77802_REG_INT1, 142 .mask_base = MAX77802_REG_INT1MSK, 143 .num_regs = 2, 144 .irqs = max77686_irqs, /* same masks as 77686 */ 145 .num_irqs = ARRAY_SIZE(max77686_irqs), 146 }; 147 148 static const struct of_device_id max77686_pmic_dt_match[] = { 149 { 150 .compatible = "maxim,max77686", 151 .data = (void *)TYPE_MAX77686, 152 }, 153 { 154 .compatible = "maxim,max77802", 155 .data = (void *)TYPE_MAX77802, 156 }, 157 { }, 158 }; 159 MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match); 160 161 static int max77686_i2c_probe(struct i2c_client *i2c) 162 { 163 struct max77686_dev *max77686 = NULL; 164 unsigned int data; 165 int ret = 0; 166 const struct regmap_config *config; 167 const struct regmap_irq_chip *irq_chip; 168 const struct mfd_cell *cells; 169 int n_devs; 170 171 max77686 = devm_kzalloc(&i2c->dev, 172 sizeof(struct max77686_dev), GFP_KERNEL); 173 if (!max77686) 174 return -ENOMEM; 175 176 i2c_set_clientdata(i2c, max77686); 177 max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev); 178 max77686->dev = &i2c->dev; 179 max77686->i2c = i2c; 180 181 max77686->irq = i2c->irq; 182 183 if (max77686->type == TYPE_MAX77686) { 184 config = &max77686_regmap_config; 185 irq_chip = &max77686_irq_chip; 186 cells = max77686_devs; 187 n_devs = ARRAY_SIZE(max77686_devs); 188 } else { 189 config = &max77802_regmap_config; 190 irq_chip = &max77802_irq_chip; 191 cells = max77802_devs; 192 n_devs = ARRAY_SIZE(max77802_devs); 193 } 194 195 max77686->regmap = devm_regmap_init_i2c(i2c, config); 196 if (IS_ERR(max77686->regmap)) { 197 ret = PTR_ERR(max77686->regmap); 198 dev_err(max77686->dev, "Failed to allocate register map: %d\n", 199 ret); 200 return ret; 201 } 202 203 ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data); 204 if (ret < 0) { 205 dev_err(max77686->dev, 206 "device not found on this channel (this is not an error)\n"); 207 return -ENODEV; 208 } 209 210 ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap, 211 max77686->irq, 212 IRQF_TRIGGER_FALLING | IRQF_ONESHOT | 213 IRQF_SHARED, 0, irq_chip, 214 &max77686->irq_data); 215 if (ret < 0) { 216 dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); 217 return ret; 218 } 219 220 ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL, 221 0, NULL); 222 if (ret < 0) { 223 dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret); 224 return ret; 225 } 226 227 return 0; 228 } 229 230 #ifdef CONFIG_PM_SLEEP 231 static int max77686_suspend(struct device *dev) 232 { 233 struct i2c_client *i2c = to_i2c_client(dev); 234 struct max77686_dev *max77686 = i2c_get_clientdata(i2c); 235 236 if (device_may_wakeup(dev)) 237 enable_irq_wake(max77686->irq); 238 239 /* 240 * IRQ must be disabled during suspend because if it happens 241 * while suspended it will be handled before resuming I2C. 242 * 243 * When device is woken up from suspend (e.g. by RTC wake alarm), 244 * an interrupt occurs before resuming I2C bus controller. 245 * Interrupt handler tries to read registers but this read 246 * will fail because I2C is still suspended. 247 */ 248 disable_irq(max77686->irq); 249 250 return 0; 251 } 252 253 static int max77686_resume(struct device *dev) 254 { 255 struct i2c_client *i2c = to_i2c_client(dev); 256 struct max77686_dev *max77686 = i2c_get_clientdata(i2c); 257 258 if (device_may_wakeup(dev)) 259 disable_irq_wake(max77686->irq); 260 261 enable_irq(max77686->irq); 262 263 return 0; 264 } 265 #endif /* CONFIG_PM_SLEEP */ 266 267 static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume); 268 269 static struct i2c_driver max77686_i2c_driver = { 270 .driver = { 271 .name = "max77686", 272 .pm = &max77686_pm, 273 .of_match_table = max77686_pmic_dt_match, 274 }, 275 .probe_new = max77686_i2c_probe, 276 }; 277 278 module_i2c_driver(max77686_i2c_driver); 279 280 MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver"); 281 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); 282 MODULE_LICENSE("GPL"); 283