1 /* 2 * Broadcom BCM590xx PMU 3 * 4 * Copyright 2014 Linaro Limited 5 * Author: Matt Porter <mporter@linaro.org> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/err.h> 14 #include <linux/i2c.h> 15 #include <linux/init.h> 16 #include <linux/mfd/bcm590xx.h> 17 #include <linux/mfd/core.h> 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/of.h> 21 #include <linux/of_device.h> 22 #include <linux/regmap.h> 23 #include <linux/slab.h> 24 25 static const struct mfd_cell bcm590xx_devs[] = { 26 { 27 .name = "bcm590xx-vregs", 28 }, 29 }; 30 31 static const struct regmap_config bcm590xx_regmap_config_pri = { 32 .reg_bits = 8, 33 .val_bits = 8, 34 .max_register = BCM590XX_MAX_REGISTER_PRI, 35 .cache_type = REGCACHE_RBTREE, 36 }; 37 38 static const struct regmap_config bcm590xx_regmap_config_sec = { 39 .reg_bits = 8, 40 .val_bits = 8, 41 .max_register = BCM590XX_MAX_REGISTER_SEC, 42 .cache_type = REGCACHE_RBTREE, 43 }; 44 45 static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri, 46 const struct i2c_device_id *id) 47 { 48 struct bcm590xx *bcm590xx; 49 int ret; 50 51 bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL); 52 if (!bcm590xx) 53 return -ENOMEM; 54 55 i2c_set_clientdata(i2c_pri, bcm590xx); 56 bcm590xx->dev = &i2c_pri->dev; 57 bcm590xx->i2c_pri = i2c_pri; 58 59 bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri, 60 &bcm590xx_regmap_config_pri); 61 if (IS_ERR(bcm590xx->regmap_pri)) { 62 ret = PTR_ERR(bcm590xx->regmap_pri); 63 dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret); 64 return ret; 65 } 66 67 /* Secondary I2C slave address is the base address with A(2) asserted */ 68 bcm590xx->i2c_sec = i2c_new_dummy(i2c_pri->adapter, 69 i2c_pri->addr | BIT(2)); 70 if (IS_ERR_OR_NULL(bcm590xx->i2c_sec)) { 71 dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n"); 72 return -ENODEV; 73 } 74 i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx); 75 76 bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec, 77 &bcm590xx_regmap_config_sec); 78 if (IS_ERR(bcm590xx->regmap_sec)) { 79 ret = PTR_ERR(bcm590xx->regmap_sec); 80 dev_err(&bcm590xx->i2c_sec->dev, 81 "secondary regmap init failed: %d\n", ret); 82 goto err; 83 } 84 85 ret = mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs, 86 ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL); 87 if (ret < 0) { 88 dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret); 89 goto err; 90 } 91 92 return 0; 93 94 err: 95 i2c_unregister_device(bcm590xx->i2c_sec); 96 return ret; 97 } 98 99 static int bcm590xx_i2c_remove(struct i2c_client *i2c) 100 { 101 mfd_remove_devices(&i2c->dev); 102 return 0; 103 } 104 105 static const struct of_device_id bcm590xx_of_match[] = { 106 { .compatible = "brcm,bcm59056" }, 107 { } 108 }; 109 MODULE_DEVICE_TABLE(of, bcm590xx_of_match); 110 111 static const struct i2c_device_id bcm590xx_i2c_id[] = { 112 { "bcm59056" }, 113 { } 114 }; 115 MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id); 116 117 static struct i2c_driver bcm590xx_i2c_driver = { 118 .driver = { 119 .name = "bcm590xx", 120 .owner = THIS_MODULE, 121 .of_match_table = of_match_ptr(bcm590xx_of_match), 122 }, 123 .probe = bcm590xx_i2c_probe, 124 .remove = bcm590xx_i2c_remove, 125 .id_table = bcm590xx_i2c_id, 126 }; 127 module_i2c_driver(bcm590xx_i2c_driver); 128 129 MODULE_AUTHOR("Matt Porter <mporter@linaro.org>"); 130 MODULE_DESCRIPTION("BCM590xx multi-function driver"); 131 MODULE_LICENSE("GPL v2"); 132 MODULE_ALIAS("i2c:bcm590xx"); 133