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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * An hwmon driver for the NXP MC34VR500 PMIC4 *5 * Author: Mario Kicherer <dev@kicherer.org>6 */7 8#include <linux/bits.h>9#include <linux/dev_printk.h>10#include <linux/device.h>11#include <linux/err.h>12#include <linux/errno.h>13#include <linux/hwmon.h>14#include <linux/i2c.h>15#include <linux/interrupt.h>16#include <linux/irqreturn.h>17#include <linux/module.h>18#include <linux/of.h>19#include <linux/regmap.h>20 21#define MC34VR500_I2C_ADDR 0x0822#define MC34VR500_DEVICEID_VALUE 0x1423 24/* INTSENSE0 */25#define ENS_BIT BIT(0)26#define LOWVINS_BIT BIT(1)27#define THERM110S_BIT BIT(2)28#define THERM120S_BIT BIT(3)29#define THERM125S_BIT BIT(4)30#define THERM130S_BIT BIT(5)31 32#define MC34VR500_DEVICEID 0x0033 34#define MC34VR500_SILICONREVID 0x0335#define MC34VR500_FABID 0x0436#define MC34VR500_INTSTAT0 0x0537#define MC34VR500_INTMASK0 0x0638#define MC34VR500_INTSENSE0 0x0739 40struct mc34vr500_data {41 struct device *hwmon_dev;42 struct regmap *regmap;43};44 45static irqreturn_t mc34vr500_process_interrupt(int irq, void *userdata)46{47 struct mc34vr500_data *data = (struct mc34vr500_data *)userdata;48 unsigned int reg;49 int ret;50 51 ret = regmap_read(data->regmap, MC34VR500_INTSTAT0, ®);52 if (ret < 0)53 return IRQ_HANDLED;54 55 if (reg) {56 if (reg & LOWVINS_BIT)57 hwmon_notify_event(data->hwmon_dev, hwmon_in,58 hwmon_in_min_alarm, 0);59 60 if (reg & THERM110S_BIT)61 hwmon_notify_event(data->hwmon_dev, hwmon_temp,62 hwmon_temp_max_alarm, 0);63 64 if (reg & THERM120S_BIT)65 hwmon_notify_event(data->hwmon_dev, hwmon_temp,66 hwmon_temp_crit_alarm, 0);67 68 if (reg & THERM130S_BIT)69 hwmon_notify_event(data->hwmon_dev, hwmon_temp,70 hwmon_temp_emergency_alarm, 0);71 72 /* write 1 to clear */73 regmap_write(data->regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |74 THERM110S_BIT | THERM120S_BIT | THERM130S_BIT);75 }76 77 return IRQ_HANDLED;78}79 80static umode_t mc34vr500_is_visible(const void *data,81 enum hwmon_sensor_types type,82 u32 attr, int channel)83{84 switch (attr) {85 case hwmon_in_min_alarm:86 case hwmon_temp_max_alarm:87 case hwmon_temp_crit_alarm:88 case hwmon_temp_emergency_alarm:89 return 0444;90 default:91 break;92 }93 94 return 0;95}96 97static int mc34vr500_alarm_read(struct mc34vr500_data *data, int index,98 long *val)99{100 unsigned int reg;101 int ret;102 103 ret = regmap_read(data->regmap, MC34VR500_INTSENSE0, ®);104 if (ret < 0)105 return ret;106 107 *val = !!(reg & index);108 109 return 0;110}111 112static int mc34vr500_read(struct device *dev, enum hwmon_sensor_types type,113 u32 attr, int channel, long *val)114{115 struct mc34vr500_data *data = dev_get_drvdata(dev);116 117 switch (type) {118 case hwmon_in:119 switch (attr) {120 case hwmon_in_min_alarm:121 return mc34vr500_alarm_read(data, LOWVINS_BIT, val);122 default:123 return -EOPNOTSUPP;124 }125 case hwmon_temp:126 switch (attr) {127 case hwmon_temp_max_alarm:128 return mc34vr500_alarm_read(data, THERM110S_BIT, val);129 case hwmon_temp_crit_alarm:130 return mc34vr500_alarm_read(data, THERM120S_BIT, val);131 case hwmon_temp_emergency_alarm:132 return mc34vr500_alarm_read(data, THERM130S_BIT, val);133 default:134 return -EOPNOTSUPP;135 }136 default:137 return -EOPNOTSUPP;138 }139}140 141static const struct hwmon_channel_info * const mc34vr500_info[] = {142 HWMON_CHANNEL_INFO(in, HWMON_I_MIN_ALARM),143 HWMON_CHANNEL_INFO(temp, HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM144 | HWMON_T_EMERGENCY_ALARM),145 NULL,146};147 148static const struct hwmon_ops mc34vr500_hwmon_ops = {149 .is_visible = mc34vr500_is_visible,150 .read = mc34vr500_read,151};152 153static const struct hwmon_chip_info mc34vr500_chip_info = {154 .ops = &mc34vr500_hwmon_ops,155 .info = mc34vr500_info,156};157 158static const struct regmap_config mc34vr500_regmap_config = {159 .reg_bits = 8,160 .val_bits = 8,161 .max_register = MC34VR500_INTSENSE0,162};163 164static int mc34vr500_probe(struct i2c_client *client)165{166 struct device *dev = &client->dev;167 struct mc34vr500_data *data;168 struct device *hwmon_dev;169 int ret;170 unsigned int reg, revid, fabid;171 struct regmap *regmap;172 173 regmap = devm_regmap_init_i2c(client, &mc34vr500_regmap_config);174 if (IS_ERR(regmap))175 return PTR_ERR(regmap);176 177 data = devm_kzalloc(dev, sizeof(struct mc34vr500_data), GFP_KERNEL);178 if (!data)179 return -ENOMEM;180 181 data->regmap = regmap;182 183 ret = regmap_read(regmap, MC34VR500_DEVICEID, ®);184 if (ret < 0)185 return ret;186 187 if (reg != MC34VR500_DEVICEID_VALUE)188 return -ENODEV;189 190 ret = regmap_read(regmap, MC34VR500_SILICONREVID, &revid);191 if (ret < 0)192 return ret;193 194 ret = regmap_read(regmap, MC34VR500_FABID, &fabid);195 if (ret < 0)196 return ret;197 198 dev_dbg(dev, "mc34vr500: revid 0x%x fabid 0x%x\n", revid, fabid);199 200 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,201 data,202 &mc34vr500_chip_info,203 NULL);204 if (IS_ERR(hwmon_dev))205 return PTR_ERR(hwmon_dev);206 207 data->hwmon_dev = hwmon_dev;208 209 if (client->irq) {210 ret = devm_request_threaded_irq(dev, client->irq, NULL,211 mc34vr500_process_interrupt,212 IRQF_TRIGGER_RISING |213 IRQF_ONESHOT |214 IRQF_SHARED,215 dev_name(dev), data);216 if (ret)217 return ret;218 219 /* write 1 to clear interrupts */220 ret = regmap_write(regmap, MC34VR500_INTSTAT0, LOWVINS_BIT |221 THERM110S_BIT | THERM120S_BIT |222 THERM130S_BIT);223 if (ret)224 return ret;225 226 /* unmask interrupts */227 ret = regmap_write(regmap, MC34VR500_INTMASK0,228 (unsigned int) ~(LOWVINS_BIT | THERM110S_BIT |229 THERM120S_BIT | THERM130S_BIT));230 if (ret)231 return ret;232 }233 234 return 0;235}236 237static const struct i2c_device_id mc34vr500_id[] = {238 { "mc34vr500" },239 { },240};241MODULE_DEVICE_TABLE(i2c, mc34vr500_id);242 243static const struct of_device_id __maybe_unused mc34vr500_of_match[] = {244 { .compatible = "nxp,mc34vr500" },245 { },246};247MODULE_DEVICE_TABLE(of, mc34vr500_of_match);248 249static struct i2c_driver mc34vr500_driver = {250 .driver = {251 .name = "mc34vr500",252 .of_match_table = of_match_ptr(mc34vr500_of_match),253 },254 .probe = mc34vr500_probe,255 .id_table = mc34vr500_id,256};257 258module_i2c_driver(mc34vr500_driver);259 260MODULE_AUTHOR("Mario Kicherer <dev@kicherer.org>");261 262MODULE_DESCRIPTION("MC34VR500 driver");263MODULE_LICENSE("GPL");264