214 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AS3711 PMIC MFC driver4 *5 * Copyright (C) 2012 Renesas Electronics Corporation6 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>7 */8 9#include <linux/device.h>10#include <linux/err.h>11#include <linux/i2c.h>12#include <linux/init.h>13#include <linux/kernel.h>14#include <linux/mfd/as3711.h>15#include <linux/mfd/core.h>16#include <linux/of.h>17#include <linux/regmap.h>18#include <linux/slab.h>19 20enum {21 AS3711_REGULATOR,22 AS3711_BACKLIGHT,23};24 25/*26 * Ok to have it static: it is only used during probing and multiple I2C devices27 * cannot be probed simultaneously. Just make sure to avoid stale data.28 */29static struct mfd_cell as3711_subdevs[] = {30 [AS3711_REGULATOR] = {.name = "as3711-regulator",},31 [AS3711_BACKLIGHT] = {.name = "as3711-backlight",},32};33 34static bool as3711_volatile_reg(struct device *dev, unsigned int reg)35{36 switch (reg) {37 case AS3711_GPIO_SIGNAL_IN:38 case AS3711_INTERRUPT_STATUS_1:39 case AS3711_INTERRUPT_STATUS_2:40 case AS3711_INTERRUPT_STATUS_3:41 case AS3711_CHARGER_STATUS_1:42 case AS3711_CHARGER_STATUS_2:43 case AS3711_REG_STATUS:44 return true;45 }46 return false;47}48 49static bool as3711_precious_reg(struct device *dev, unsigned int reg)50{51 switch (reg) {52 case AS3711_INTERRUPT_STATUS_1:53 case AS3711_INTERRUPT_STATUS_2:54 case AS3711_INTERRUPT_STATUS_3:55 return true;56 }57 return false;58}59 60static bool as3711_readable_reg(struct device *dev, unsigned int reg)61{62 switch (reg) {63 case AS3711_SD_1_VOLTAGE:64 case AS3711_SD_2_VOLTAGE:65 case AS3711_SD_3_VOLTAGE:66 case AS3711_SD_4_VOLTAGE:67 case AS3711_LDO_1_VOLTAGE:68 case AS3711_LDO_2_VOLTAGE:69 case AS3711_LDO_3_VOLTAGE:70 case AS3711_LDO_4_VOLTAGE:71 case AS3711_LDO_5_VOLTAGE:72 case AS3711_LDO_6_VOLTAGE:73 case AS3711_LDO_7_VOLTAGE:74 case AS3711_LDO_8_VOLTAGE:75 case AS3711_SD_CONTROL:76 case AS3711_GPIO_SIGNAL_OUT:77 case AS3711_GPIO_SIGNAL_IN:78 case AS3711_SD_CONTROL_1:79 case AS3711_SD_CONTROL_2:80 case AS3711_CURR_CONTROL:81 case AS3711_CURR1_VALUE:82 case AS3711_CURR2_VALUE:83 case AS3711_CURR3_VALUE:84 case AS3711_STEPUP_CONTROL_1:85 case AS3711_STEPUP_CONTROL_2:86 case AS3711_STEPUP_CONTROL_4:87 case AS3711_STEPUP_CONTROL_5:88 case AS3711_REG_STATUS:89 case AS3711_INTERRUPT_STATUS_1:90 case AS3711_INTERRUPT_STATUS_2:91 case AS3711_INTERRUPT_STATUS_3:92 case AS3711_CHARGER_STATUS_1:93 case AS3711_CHARGER_STATUS_2:94 case AS3711_ASIC_ID_1:95 case AS3711_ASIC_ID_2:96 return true;97 }98 return false;99}100 101static const struct regmap_config as3711_regmap_config = {102 .reg_bits = 8,103 .val_bits = 8,104 .volatile_reg = as3711_volatile_reg,105 .readable_reg = as3711_readable_reg,106 .precious_reg = as3711_precious_reg,107 .max_register = AS3711_MAX_REG,108 .num_reg_defaults_raw = AS3711_NUM_REGS,109 .cache_type = REGCACHE_MAPLE,110};111 112#ifdef CONFIG_OF113static const struct of_device_id as3711_of_match[] = {114 {.compatible = "ams,as3711",},115 {}116};117#endif118 119static int as3711_i2c_probe(struct i2c_client *client)120{121 struct as3711 *as3711;122 struct as3711_platform_data *pdata;123 unsigned int id1, id2;124 int ret;125 126 if (!client->dev.of_node) {127 pdata = dev_get_platdata(&client->dev);128 if (!pdata)129 dev_dbg(&client->dev, "Platform data not found\n");130 } else {131 pdata = devm_kzalloc(&client->dev,132 sizeof(*pdata), GFP_KERNEL);133 if (!pdata)134 return -ENOMEM;135 }136 137 as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);138 if (!as3711)139 return -ENOMEM;140 141 as3711->dev = &client->dev;142 i2c_set_clientdata(client, as3711);143 144 if (client->irq)145 dev_notice(&client->dev, "IRQ not supported yet\n");146 147 as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);148 if (IS_ERR(as3711->regmap)) {149 ret = PTR_ERR(as3711->regmap);150 dev_err(&client->dev,151 "regmap initialization failed: %d\n", ret);152 return ret;153 }154 155 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);156 if (!ret)157 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);158 if (ret < 0) {159 dev_err(&client->dev, "regmap_read() failed: %d\n", ret);160 return ret;161 }162 if (id1 != 0x8b)163 return -ENODEV;164 dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);165 166 /*167 * We can reuse as3711_subdevs[],168 * it will be copied in mfd_add_devices()169 */170 if (pdata) {171 as3711_subdevs[AS3711_REGULATOR].platform_data =172 &pdata->regulator;173 as3711_subdevs[AS3711_REGULATOR].pdata_size =174 sizeof(pdata->regulator);175 as3711_subdevs[AS3711_BACKLIGHT].platform_data =176 &pdata->backlight;177 as3711_subdevs[AS3711_BACKLIGHT].pdata_size =178 sizeof(pdata->backlight);179 } else {180 as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;181 as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;182 as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;183 as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;184 }185 186 ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,187 ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);188 if (ret < 0)189 dev_err(&client->dev, "add mfd devices failed: %d\n", ret);190 191 return ret;192}193 194static const struct i2c_device_id as3711_i2c_id[] = {195 {.name = "as3711", .driver_data = 0},196 {}197};198 199static struct i2c_driver as3711_i2c_driver = {200 .driver = {201 .name = "as3711",202 .of_match_table = of_match_ptr(as3711_of_match),203 },204 .probe = as3711_i2c_probe,205 .id_table = as3711_i2c_id,206};207 208static int __init as3711_i2c_init(void)209{210 return i2c_add_driver(&as3711_i2c_driver);211}212/* Initialise early */213subsys_initcall(as3711_i2c_init);214