1/* 2 * TI SMSC MFD Driver 3 * 4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com 5 * 6 * Author: Sourav Poddar <sourav.poddar@ti.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; GPL v2. 11 * 12 */ 13 14#include <linux/module.h> 15#include <linux/moduleparam.h> 16#include <linux/slab.h> 17#include <linux/i2c.h> 18#include <linux/gpio.h> 19#include <linux/workqueue.h> 20#include <linux/irq.h> 21#include <linux/regmap.h> 22#include <linux/err.h> 23#include <linux/mfd/core.h> 24#include <linux/mfd/smsc.h> 25#include <linux/of_platform.h> 26 27static const struct regmap_config smsc_regmap_config = { 28 .reg_bits = 8, 29 .val_bits = 8, 30 .max_register = SMSC_VEN_ID_H, 31 .cache_type = REGCACHE_RBTREE, 32}; 33 34static int smsc_i2c_probe(struct i2c_client *i2c, 35 const struct i2c_device_id *id) 36{ 37 struct smsc *smsc; 38 int devid, rev, venid_l, venid_h; 39 int ret = 0; 40 41 smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc), 42 GFP_KERNEL); 43 if (!smsc) { 44 dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n"); 45 return -ENOMEM; 46 } 47 48 smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config); 49 if (IS_ERR(smsc->regmap)) { 50 ret = PTR_ERR(smsc->regmap); 51 goto err; 52 } 53 54 i2c_set_clientdata(i2c, smsc); 55 smsc->dev = &i2c->dev; 56 57#ifdef CONFIG_OF 58 of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk); 59#endif 60 61 regmap_read(smsc->regmap, SMSC_DEV_ID, &devid); 62 regmap_read(smsc->regmap, SMSC_DEV_REV, &rev); 63 regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l); 64 regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h); 65 66 dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n", 67 devid, rev, (venid_h << 8) | venid_l); 68 69 ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk); 70 if (ret) 71 goto err; 72 73#ifdef CONFIG_OF 74 if (i2c->dev.of_node) 75 ret = of_platform_populate(i2c->dev.of_node, 76 NULL, NULL, &i2c->dev); 77#endif 78 79err: 80 return ret; 81} 82 83static int smsc_i2c_remove(struct i2c_client *i2c) 84{ 85 struct smsc *smsc = i2c_get_clientdata(i2c); 86 87 mfd_remove_devices(smsc->dev); 88 89 return 0; 90} 91 92static const struct i2c_device_id smsc_i2c_id[] = { 93 { "smscece1099", 0}, 94 {}, 95}; 96MODULE_DEVICE_TABLE(i2c, smsc_i2c_id); 97 98static struct i2c_driver smsc_i2c_driver = { 99 .driver = { 100 .name = "smsc", 101 }, 102 .probe = smsc_i2c_probe, 103 .remove = smsc_i2c_remove, 104 .id_table = smsc_i2c_id, 105}; 106 107module_i2c_driver(smsc_i2c_driver); 108 109MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); 110MODULE_DESCRIPTION("SMSC chip multi-function driver"); 111MODULE_LICENSE("GPL v2"); 112