112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
/*
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* TI SMSC MFD Driver
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
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*
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* Author: Sourav Poddar <sourav.poddar@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; GPL v2.
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/workqueue.h>
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#include <linux/irq.h>
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#include <linux/regmap.h>
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#include <linux/err.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/smsc.h>
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#include <linux/of_platform.h>
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static const struct regmap_config smsc_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = SMSC_VEN_ID_H,
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.cache_type = REGCACHE_RBTREE,
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};
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static int smsc_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct smsc *smsc;
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int devid, rev, venid_l, venid_h;
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int ret = 0;
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smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc),
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GFP_KERNEL);
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if (!smsc) {
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dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n");
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return -ENOMEM;
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}
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smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config);
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if (IS_ERR(smsc->regmap)) {
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ret = PTR_ERR(smsc->regmap);
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goto err;
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}
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i2c_set_clientdata(i2c, smsc);
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smsc->dev = &i2c->dev;
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#ifdef CONFIG_OF
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of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk);
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#endif
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regmap_read(smsc->regmap, SMSC_DEV_ID, &devid);
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regmap_read(smsc->regmap, SMSC_DEV_REV, &rev);
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regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l);
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regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h);
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dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n",
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devid, rev, (venid_h << 8) | venid_l);
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ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk);
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if (ret)
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goto err;
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#ifdef CONFIG_OF
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if (i2c->dev.of_node)
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ret = of_platform_populate(i2c->dev.of_node,
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NULL, NULL, &i2c->dev);
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#endif
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err:
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return ret;
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}
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static int smsc_i2c_remove(struct i2c_client *i2c)
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{
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struct smsc *smsc = i2c_get_clientdata(i2c);
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mfd_remove_devices(smsc->dev);
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return 0;
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}
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static const struct i2c_device_id smsc_i2c_id[] = {
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{ "smscece1099", 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, smsc_i2c_id);
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static struct i2c_driver smsc_i2c_driver = {
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.driver = {
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.name = "smsc",
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},
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.probe = smsc_i2c_probe,
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.remove = smsc_i2c_remove,
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.id_table = smsc_i2c_id,
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};
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module_i2c_driver(smsc_i2c_driver);
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MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>");
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MODULE_DESCRIPTION("SMSC chip multi-function driver");
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MODULE_LICENSE("GPL v2");
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