1 /* 2 * AS3711 PMIC MFC driver 3 * 4 * Copyright (C) 2012 Renesas Electronics Corporation 5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the version 2 of the GNU General Public License as 9 * published by the Free Software Foundation 10 */ 11 12 #include <linux/device.h> 13 #include <linux/err.h> 14 #include <linux/i2c.h> 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/mfd/as3711.h> 18 #include <linux/mfd/core.h> 19 #include <linux/module.h> 20 #include <linux/regmap.h> 21 #include <linux/slab.h> 22 23 enum { 24 AS3711_REGULATOR, 25 AS3711_BACKLIGHT, 26 }; 27 28 /* 29 * Ok to have it static: it is only used during probing and multiple I2C devices 30 * cannot be probed simultaneously. Just make sure to avoid stale data. 31 */ 32 static struct mfd_cell as3711_subdevs[] = { 33 [AS3711_REGULATOR] = {.name = "as3711-regulator",}, 34 [AS3711_BACKLIGHT] = {.name = "as3711-backlight",}, 35 }; 36 37 static bool as3711_volatile_reg(struct device *dev, unsigned int reg) 38 { 39 switch (reg) { 40 case AS3711_GPIO_SIGNAL_IN: 41 case AS3711_INTERRUPT_STATUS_1: 42 case AS3711_INTERRUPT_STATUS_2: 43 case AS3711_INTERRUPT_STATUS_3: 44 case AS3711_CHARGER_STATUS_1: 45 case AS3711_CHARGER_STATUS_2: 46 case AS3711_REG_STATUS: 47 return true; 48 } 49 return false; 50 } 51 52 static bool as3711_precious_reg(struct device *dev, unsigned int reg) 53 { 54 switch (reg) { 55 case AS3711_INTERRUPT_STATUS_1: 56 case AS3711_INTERRUPT_STATUS_2: 57 case AS3711_INTERRUPT_STATUS_3: 58 return true; 59 } 60 return false; 61 } 62 63 static bool as3711_readable_reg(struct device *dev, unsigned int reg) 64 { 65 switch (reg) { 66 case AS3711_SD_1_VOLTAGE: 67 case AS3711_SD_2_VOLTAGE: 68 case AS3711_SD_3_VOLTAGE: 69 case AS3711_SD_4_VOLTAGE: 70 case AS3711_LDO_1_VOLTAGE: 71 case AS3711_LDO_2_VOLTAGE: 72 case AS3711_LDO_3_VOLTAGE: 73 case AS3711_LDO_4_VOLTAGE: 74 case AS3711_LDO_5_VOLTAGE: 75 case AS3711_LDO_6_VOLTAGE: 76 case AS3711_LDO_7_VOLTAGE: 77 case AS3711_LDO_8_VOLTAGE: 78 case AS3711_SD_CONTROL: 79 case AS3711_GPIO_SIGNAL_OUT: 80 case AS3711_GPIO_SIGNAL_IN: 81 case AS3711_SD_CONTROL_1: 82 case AS3711_SD_CONTROL_2: 83 case AS3711_CURR_CONTROL: 84 case AS3711_CURR1_VALUE: 85 case AS3711_CURR2_VALUE: 86 case AS3711_CURR3_VALUE: 87 case AS3711_STEPUP_CONTROL_1: 88 case AS3711_STEPUP_CONTROL_2: 89 case AS3711_STEPUP_CONTROL_4: 90 case AS3711_STEPUP_CONTROL_5: 91 case AS3711_REG_STATUS: 92 case AS3711_INTERRUPT_STATUS_1: 93 case AS3711_INTERRUPT_STATUS_2: 94 case AS3711_INTERRUPT_STATUS_3: 95 case AS3711_CHARGER_STATUS_1: 96 case AS3711_CHARGER_STATUS_2: 97 case AS3711_ASIC_ID_1: 98 case AS3711_ASIC_ID_2: 99 return true; 100 } 101 return false; 102 } 103 104 static const struct regmap_config as3711_regmap_config = { 105 .reg_bits = 8, 106 .val_bits = 8, 107 .volatile_reg = as3711_volatile_reg, 108 .readable_reg = as3711_readable_reg, 109 .precious_reg = as3711_precious_reg, 110 .max_register = AS3711_MAX_REGS, 111 .num_reg_defaults_raw = AS3711_MAX_REGS, 112 .cache_type = REGCACHE_RBTREE, 113 }; 114 115 static int as3711_i2c_probe(struct i2c_client *client, 116 const struct i2c_device_id *id) 117 { 118 struct as3711 *as3711; 119 struct as3711_platform_data *pdata = client->dev.platform_data; 120 unsigned int id1, id2; 121 int ret; 122 123 if (!pdata) 124 dev_dbg(&client->dev, "Platform data not found\n"); 125 126 as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL); 127 if (!as3711) { 128 dev_err(&client->dev, "Memory allocation failed\n"); 129 return -ENOMEM; 130 } 131 132 as3711->dev = &client->dev; 133 i2c_set_clientdata(client, as3711); 134 135 if (client->irq) 136 dev_notice(&client->dev, "IRQ not supported yet\n"); 137 138 as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config); 139 if (IS_ERR(as3711->regmap)) { 140 ret = PTR_ERR(as3711->regmap); 141 dev_err(&client->dev, "regmap initialization failed: %d\n", ret); 142 return ret; 143 } 144 145 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1); 146 if (!ret) 147 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2); 148 if (ret < 0) { 149 dev_err(&client->dev, "regmap_read() failed: %d\n", ret); 150 return ret; 151 } 152 if (id1 != 0x8b) 153 return -ENODEV; 154 dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2); 155 156 /* We can reuse as3711_subdevs[], it will be copied in mfd_add_devices() */ 157 if (pdata) { 158 as3711_subdevs[AS3711_REGULATOR].platform_data = &pdata->regulator; 159 as3711_subdevs[AS3711_REGULATOR].pdata_size = sizeof(pdata->regulator); 160 as3711_subdevs[AS3711_BACKLIGHT].platform_data = &pdata->backlight; 161 as3711_subdevs[AS3711_BACKLIGHT].pdata_size = sizeof(pdata->backlight); 162 } else { 163 as3711_subdevs[AS3711_REGULATOR].platform_data = NULL; 164 as3711_subdevs[AS3711_REGULATOR].pdata_size = 0; 165 as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL; 166 as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0; 167 } 168 169 ret = mfd_add_devices(as3711->dev, -1, as3711_subdevs, 170 ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL); 171 if (ret < 0) 172 dev_err(&client->dev, "add mfd devices failed: %d\n", ret); 173 174 return ret; 175 } 176 177 static int as3711_i2c_remove(struct i2c_client *client) 178 { 179 struct as3711 *as3711 = i2c_get_clientdata(client); 180 181 mfd_remove_devices(as3711->dev); 182 return 0; 183 } 184 185 static const struct i2c_device_id as3711_i2c_id[] = { 186 {.name = "as3711", .driver_data = 0}, 187 {} 188 }; 189 190 MODULE_DEVICE_TABLE(i2c, as3711_i2c_id); 191 192 static struct i2c_driver as3711_i2c_driver = { 193 .driver = { 194 .name = "as3711", 195 .owner = THIS_MODULE, 196 }, 197 .probe = as3711_i2c_probe, 198 .remove = as3711_i2c_remove, 199 .id_table = as3711_i2c_id, 200 }; 201 202 static int __init as3711_i2c_init(void) 203 { 204 return i2c_add_driver(&as3711_i2c_driver); 205 } 206 /* Initialise early */ 207 subsys_initcall(as3711_i2c_init); 208 209 static void __exit as3711_i2c_exit(void) 210 { 211 i2c_del_driver(&as3711_i2c_driver); 212 } 213 module_exit(as3711_i2c_exit); 214 215 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 216 MODULE_DESCRIPTION("AS3711 PMIC driver"); 217 MODULE_LICENSE("GPL v2"); 218