339 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * max8907.c - mfd driver for MAX89074 *5 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com>6 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved.7 */8 9#include <linux/err.h>10#include <linux/i2c.h>11#include <linux/init.h>12#include <linux/interrupt.h>13#include <linux/irq.h>14#include <linux/mfd/core.h>15#include <linux/mfd/max8907.h>16#include <linux/module.h>17#include <linux/of.h>18#include <linux/regmap.h>19#include <linux/slab.h>20 21static const struct mfd_cell max8907_cells[] = {22 { .name = "max8907-regulator", },23 { .name = "max8907-rtc", },24};25 26static bool max8907_gen_is_volatile_reg(struct device *dev, unsigned int reg)27{28 switch (reg) {29 case MAX8907_REG_ON_OFF_IRQ1:30 case MAX8907_REG_ON_OFF_STAT:31 case MAX8907_REG_ON_OFF_IRQ2:32 case MAX8907_REG_CHG_IRQ1:33 case MAX8907_REG_CHG_IRQ2:34 case MAX8907_REG_CHG_STAT:35 return true;36 default:37 return false;38 }39}40 41static bool max8907_gen_is_precious_reg(struct device *dev, unsigned int reg)42{43 switch (reg) {44 case MAX8907_REG_ON_OFF_IRQ1:45 case MAX8907_REG_ON_OFF_IRQ2:46 case MAX8907_REG_CHG_IRQ1:47 case MAX8907_REG_CHG_IRQ2:48 return true;49 default:50 return false;51 }52}53 54static bool max8907_gen_is_writeable_reg(struct device *dev, unsigned int reg)55{56 return !max8907_gen_is_volatile_reg(dev, reg);57}58 59static const struct regmap_config max8907_regmap_gen_config = {60 .reg_bits = 8,61 .val_bits = 8,62 .volatile_reg = max8907_gen_is_volatile_reg,63 .precious_reg = max8907_gen_is_precious_reg,64 .writeable_reg = max8907_gen_is_writeable_reg,65 .max_register = MAX8907_REG_LDO20VOUT,66 .cache_type = REGCACHE_MAPLE,67};68 69static bool max8907_rtc_is_volatile_reg(struct device *dev, unsigned int reg)70{71 if (reg <= MAX8907_REG_RTC_YEAR2)72 return true;73 74 switch (reg) {75 case MAX8907_REG_RTC_STATUS:76 case MAX8907_REG_RTC_IRQ:77 return true;78 default:79 return false;80 }81}82 83static bool max8907_rtc_is_precious_reg(struct device *dev, unsigned int reg)84{85 switch (reg) {86 case MAX8907_REG_RTC_IRQ:87 return true;88 default:89 return false;90 }91}92 93static bool max8907_rtc_is_writeable_reg(struct device *dev, unsigned int reg)94{95 switch (reg) {96 case MAX8907_REG_RTC_STATUS:97 case MAX8907_REG_RTC_IRQ:98 return false;99 default:100 return true;101 }102}103 104static const struct regmap_config max8907_regmap_rtc_config = {105 .reg_bits = 8,106 .val_bits = 8,107 .volatile_reg = max8907_rtc_is_volatile_reg,108 .precious_reg = max8907_rtc_is_precious_reg,109 .writeable_reg = max8907_rtc_is_writeable_reg,110 .max_register = MAX8907_REG_MPL_CNTL,111 .cache_type = REGCACHE_MAPLE,112};113 114static const struct regmap_irq max8907_chg_irqs[] = {115 { .reg_offset = 0, .mask = 1 << 0, },116 { .reg_offset = 0, .mask = 1 << 1, },117 { .reg_offset = 0, .mask = 1 << 2, },118 { .reg_offset = 1, .mask = 1 << 0, },119 { .reg_offset = 1, .mask = 1 << 1, },120 { .reg_offset = 1, .mask = 1 << 2, },121 { .reg_offset = 1, .mask = 1 << 3, },122 { .reg_offset = 1, .mask = 1 << 4, },123 { .reg_offset = 1, .mask = 1 << 5, },124 { .reg_offset = 1, .mask = 1 << 6, },125 { .reg_offset = 1, .mask = 1 << 7, },126};127 128static const struct regmap_irq_chip max8907_chg_irq_chip = {129 .name = "max8907 chg",130 .status_base = MAX8907_REG_CHG_IRQ1,131 .mask_base = MAX8907_REG_CHG_IRQ1_MASK,132 .wake_base = MAX8907_REG_CHG_IRQ1_MASK,133 .irq_reg_stride = MAX8907_REG_CHG_IRQ2 - MAX8907_REG_CHG_IRQ1,134 .num_regs = 2,135 .irqs = max8907_chg_irqs,136 .num_irqs = ARRAY_SIZE(max8907_chg_irqs),137};138 139static const struct regmap_irq max8907_on_off_irqs[] = {140 { .reg_offset = 0, .mask = 1 << 0, },141 { .reg_offset = 0, .mask = 1 << 1, },142 { .reg_offset = 0, .mask = 1 << 2, },143 { .reg_offset = 0, .mask = 1 << 3, },144 { .reg_offset = 0, .mask = 1 << 4, },145 { .reg_offset = 0, .mask = 1 << 5, },146 { .reg_offset = 0, .mask = 1 << 6, },147 { .reg_offset = 0, .mask = 1 << 7, },148 { .reg_offset = 1, .mask = 1 << 0, },149 { .reg_offset = 1, .mask = 1 << 1, },150};151 152static const struct regmap_irq_chip max8907_on_off_irq_chip = {153 .name = "max8907 on_off",154 .status_base = MAX8907_REG_ON_OFF_IRQ1,155 .mask_base = MAX8907_REG_ON_OFF_IRQ1_MASK,156 .irq_reg_stride = MAX8907_REG_ON_OFF_IRQ2 - MAX8907_REG_ON_OFF_IRQ1,157 .num_regs = 2,158 .irqs = max8907_on_off_irqs,159 .num_irqs = ARRAY_SIZE(max8907_on_off_irqs),160};161 162static const struct regmap_irq max8907_rtc_irqs[] = {163 { .reg_offset = 0, .mask = 1 << 2, },164 { .reg_offset = 0, .mask = 1 << 3, },165};166 167static const struct regmap_irq_chip max8907_rtc_irq_chip = {168 .name = "max8907 rtc",169 .status_base = MAX8907_REG_RTC_IRQ,170 .mask_base = MAX8907_REG_RTC_IRQ_MASK,171 .num_regs = 1,172 .irqs = max8907_rtc_irqs,173 .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),174};175 176static struct max8907 *max8907_pm_off;177static void max8907_power_off(void)178{179 regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,180 MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);181}182 183static int max8907_i2c_probe(struct i2c_client *i2c)184{185 struct max8907 *max8907;186 int ret;187 struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);188 bool pm_off = false;189 190 if (pdata)191 pm_off = pdata->pm_off;192 else if (i2c->dev.of_node)193 pm_off = of_property_read_bool(i2c->dev.of_node,194 "maxim,system-power-controller");195 196 max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);197 if (!max8907) {198 ret = -ENOMEM;199 goto err_alloc_drvdata;200 }201 202 max8907->dev = &i2c->dev;203 max8907->i2c_gen = i2c;204 i2c_set_clientdata(i2c, max8907);205 max8907->regmap_gen = devm_regmap_init_i2c(i2c,206 &max8907_regmap_gen_config);207 if (IS_ERR(max8907->regmap_gen)) {208 ret = PTR_ERR(max8907->regmap_gen);209 dev_err(&i2c->dev, "gen regmap init failed: %d\n", ret);210 goto err_regmap_gen;211 }212 213 max8907->i2c_rtc = i2c_new_dummy_device(i2c->adapter, MAX8907_RTC_I2C_ADDR);214 if (IS_ERR(max8907->i2c_rtc)) {215 ret = PTR_ERR(max8907->i2c_rtc);216 goto err_dummy_rtc;217 }218 i2c_set_clientdata(max8907->i2c_rtc, max8907);219 max8907->regmap_rtc = devm_regmap_init_i2c(max8907->i2c_rtc,220 &max8907_regmap_rtc_config);221 if (IS_ERR(max8907->regmap_rtc)) {222 ret = PTR_ERR(max8907->regmap_rtc);223 dev_err(&i2c->dev, "rtc regmap init failed: %d\n", ret);224 goto err_regmap_rtc;225 }226 227 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,228 IRQF_ONESHOT | IRQF_SHARED,229 -1, &max8907_chg_irq_chip,230 &max8907->irqc_chg);231 if (ret != 0) {232 dev_err(&i2c->dev, "failed to add chg irq chip: %d\n", ret);233 goto err_irqc_chg;234 }235 ret = regmap_add_irq_chip(max8907->regmap_gen, max8907->i2c_gen->irq,236 IRQF_ONESHOT | IRQF_SHARED, -1,237 &max8907_on_off_irq_chip,238 &max8907->irqc_on_off);239 if (ret != 0) {240 dev_err(&i2c->dev, "failed to add on off irq chip: %d\n", ret);241 goto err_irqc_on_off;242 }243 ret = regmap_add_irq_chip(max8907->regmap_rtc, max8907->i2c_gen->irq,244 IRQF_ONESHOT | IRQF_SHARED, -1,245 &max8907_rtc_irq_chip,246 &max8907->irqc_rtc);247 if (ret != 0) {248 dev_err(&i2c->dev, "failed to add rtc irq chip: %d\n", ret);249 goto err_irqc_rtc;250 }251 252 ret = mfd_add_devices(max8907->dev, -1, max8907_cells,253 ARRAY_SIZE(max8907_cells), NULL, 0, NULL);254 if (ret != 0) {255 dev_err(&i2c->dev, "failed to add MFD devices %d\n", ret);256 goto err_add_devices;257 }258 259 if (pm_off && !pm_power_off) {260 max8907_pm_off = max8907;261 pm_power_off = max8907_power_off;262 }263 264 return 0;265 266err_add_devices:267 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);268err_irqc_rtc:269 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);270err_irqc_on_off:271 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);272err_irqc_chg:273err_regmap_rtc:274 i2c_unregister_device(max8907->i2c_rtc);275err_dummy_rtc:276err_regmap_gen:277err_alloc_drvdata:278 return ret;279}280 281static void max8907_i2c_remove(struct i2c_client *i2c)282{283 struct max8907 *max8907 = i2c_get_clientdata(i2c);284 285 mfd_remove_devices(max8907->dev);286 287 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_rtc);288 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_on_off);289 regmap_del_irq_chip(max8907->i2c_gen->irq, max8907->irqc_chg);290 291 i2c_unregister_device(max8907->i2c_rtc);292}293 294#ifdef CONFIG_OF295static const struct of_device_id max8907_of_match[] = {296 { .compatible = "maxim,max8907" },297 { },298};299MODULE_DEVICE_TABLE(of, max8907_of_match);300#endif301 302static const struct i2c_device_id max8907_i2c_id[] = {303 { "max8907" },304 {}305};306MODULE_DEVICE_TABLE(i2c, max8907_i2c_id);307 308static struct i2c_driver max8907_i2c_driver = {309 .driver = {310 .name = "max8907",311 .of_match_table = of_match_ptr(max8907_of_match),312 },313 .probe = max8907_i2c_probe,314 .remove = max8907_i2c_remove,315 .id_table = max8907_i2c_id,316};317 318static int __init max8907_i2c_init(void)319{320 int ret = -ENODEV;321 322 ret = i2c_add_driver(&max8907_i2c_driver);323 if (ret != 0)324 pr_err("Failed to register I2C driver: %d\n", ret);325 326 return ret;327}328subsys_initcall(max8907_i2c_init);329 330static void __exit max8907_i2c_exit(void)331{332 i2c_del_driver(&max8907_i2c_driver);333}334module_exit(max8907_i2c_exit);335 336MODULE_DESCRIPTION("MAX8907 multi-function core driver");337MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>");338MODULE_LICENSE("GPL v2");339