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 #ifdef CONFIG_OF 116 static struct of_device_id as3711_of_match[] = { 117 {.compatible = "ams,as3711",}, 118 {} 119 }; 120 MODULE_DEVICE_TABLE(of, as3711_of_match); 121 #endif 122 123 static int as3711_i2c_probe(struct i2c_client *client, 124 const struct i2c_device_id *id) 125 { 126 struct as3711 *as3711; 127 struct as3711_platform_data *pdata; 128 unsigned int id1, id2; 129 int ret; 130 131 if (!client->dev.of_node) { 132 pdata = client->dev.platform_data; 133 if (!pdata) 134 dev_dbg(&client->dev, "Platform data not found\n"); 135 } else { 136 pdata = devm_kzalloc(&client->dev, 137 sizeof(*pdata), GFP_KERNEL); 138 if (!pdata) { 139 dev_err(&client->dev, "Failed to allocate pdata\n"); 140 return -ENOMEM; 141 } 142 } 143 144 as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL); 145 if (!as3711) { 146 dev_err(&client->dev, "Memory allocation failed\n"); 147 return -ENOMEM; 148 } 149 150 as3711->dev = &client->dev; 151 i2c_set_clientdata(client, as3711); 152 153 if (client->irq) 154 dev_notice(&client->dev, "IRQ not supported yet\n"); 155 156 as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config); 157 if (IS_ERR(as3711->regmap)) { 158 ret = PTR_ERR(as3711->regmap); 159 dev_err(&client->dev, "regmap initialization failed: %d\n", ret); 160 return ret; 161 } 162 163 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1); 164 if (!ret) 165 ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2); 166 if (ret < 0) { 167 dev_err(&client->dev, "regmap_read() failed: %d\n", ret); 168 return ret; 169 } 170 if (id1 != 0x8b) 171 return -ENODEV; 172 dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2); 173 174 /* We can reuse as3711_subdevs[], it will be copied in mfd_add_devices() */ 175 if (pdata) { 176 as3711_subdevs[AS3711_REGULATOR].platform_data = &pdata->regulator; 177 as3711_subdevs[AS3711_REGULATOR].pdata_size = sizeof(pdata->regulator); 178 as3711_subdevs[AS3711_BACKLIGHT].platform_data = &pdata->backlight; 179 as3711_subdevs[AS3711_BACKLIGHT].pdata_size = sizeof(pdata->backlight); 180 } else { 181 as3711_subdevs[AS3711_REGULATOR].platform_data = NULL; 182 as3711_subdevs[AS3711_REGULATOR].pdata_size = 0; 183 as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL; 184 as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0; 185 } 186 187 ret = mfd_add_devices(as3711->dev, -1, as3711_subdevs, 188 ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL); 189 if (ret < 0) 190 dev_err(&client->dev, "add mfd devices failed: %d\n", ret); 191 192 return ret; 193 } 194 195 static int as3711_i2c_remove(struct i2c_client *client) 196 { 197 struct as3711 *as3711 = i2c_get_clientdata(client); 198 199 mfd_remove_devices(as3711->dev); 200 return 0; 201 } 202 203 static const struct i2c_device_id as3711_i2c_id[] = { 204 {.name = "as3711", .driver_data = 0}, 205 {} 206 }; 207 208 MODULE_DEVICE_TABLE(i2c, as3711_i2c_id); 209 210 static struct i2c_driver as3711_i2c_driver = { 211 .driver = { 212 .name = "as3711", 213 .owner = THIS_MODULE, 214 .of_match_table = of_match_ptr(as3711_of_match), 215 }, 216 .probe = as3711_i2c_probe, 217 .remove = as3711_i2c_remove, 218 .id_table = as3711_i2c_id, 219 }; 220 221 static int __init as3711_i2c_init(void) 222 { 223 return i2c_add_driver(&as3711_i2c_driver); 224 } 225 /* Initialise early */ 226 subsys_initcall(as3711_i2c_init); 227 228 static void __exit as3711_i2c_exit(void) 229 { 230 i2c_del_driver(&as3711_i2c_driver); 231 } 232 module_exit(as3711_i2c_exit); 233 234 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 235 MODULE_DESCRIPTION("AS3711 PMIC driver"); 236 MODULE_LICENSE("GPL v2"); 237