| Sourav Poddar | 8284328 | 2012-10-01 16:31:22 +0530 | [diff] [blame] | 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/init.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/i2c.h> |
| 19 | #include <linux/gpio.h> |
| 20 | #include <linux/workqueue.h> |
| 21 | #include <linux/irq.h> |
| 22 | #include <linux/regmap.h> |
| 23 | #include <linux/err.h> |
| 24 | #include <linux/mfd/core.h> |
| 25 | #include <linux/mfd/smsc.h> |
| 26 | #include <linux/of_platform.h> |
| 27 | |
| 28 | static struct regmap_config smsc_regmap_config = { |
| 29 | .reg_bits = 8, |
| 30 | .val_bits = 8, |
| 31 | .max_register = SMSC_VEN_ID_H, |
| 32 | .cache_type = REGCACHE_RBTREE, |
| 33 | }; |
| 34 | |
| 35 | static int smsc_i2c_probe(struct i2c_client *i2c, |
| 36 | const struct i2c_device_id *id) |
| 37 | { |
| 38 | struct smsc *smsc; |
| 39 | int devid, rev, venid_l, venid_h; |
| 40 | int ret = 0; |
| 41 | |
| 42 | smsc = devm_kzalloc(&i2c->dev, sizeof(struct smsc), |
| 43 | GFP_KERNEL); |
| 44 | if (!smsc) { |
| 45 | dev_err(&i2c->dev, "smsc mfd driver memory allocation failed\n"); |
| 46 | return -ENOMEM; |
| 47 | } |
| 48 | |
| 49 | smsc->regmap = devm_regmap_init_i2c(i2c, &smsc_regmap_config); |
| 50 | if (IS_ERR(smsc->regmap)) { |
| 51 | ret = PTR_ERR(smsc->regmap); |
| 52 | goto err; |
| 53 | } |
| 54 | |
| 55 | i2c_set_clientdata(i2c, smsc); |
| 56 | smsc->dev = &i2c->dev; |
| 57 | |
| 58 | #ifdef CONFIG_OF |
| 59 | of_property_read_u32(i2c->dev.of_node, "clock", &smsc->clk); |
| 60 | #endif |
| 61 | |
| 62 | regmap_read(smsc->regmap, SMSC_DEV_ID, &devid); |
| 63 | regmap_read(smsc->regmap, SMSC_DEV_REV, &rev); |
| 64 | regmap_read(smsc->regmap, SMSC_VEN_ID_L, &venid_l); |
| 65 | regmap_read(smsc->regmap, SMSC_VEN_ID_H, &venid_h); |
| 66 | |
| 67 | dev_info(&i2c->dev, "SMSCxxx devid: %02x rev: %02x venid: %02x\n", |
| 68 | devid, rev, (venid_h << 8) | venid_l); |
| 69 | |
| 70 | ret = regmap_write(smsc->regmap, SMSC_CLK_CTRL, smsc->clk); |
| 71 | if (ret) |
| 72 | goto err; |
| 73 | |
| 74 | #ifdef CONFIG_OF |
| 75 | if (i2c->dev.of_node) |
| 76 | ret = of_platform_populate(i2c->dev.of_node, |
| 77 | NULL, NULL, &i2c->dev); |
| 78 | #endif |
| 79 | |
| 80 | err: |
| 81 | return ret; |
| 82 | } |
| 83 | |
| 84 | static int smsc_i2c_remove(struct i2c_client *i2c) |
| 85 | { |
| 86 | struct smsc *smsc = i2c_get_clientdata(i2c); |
| 87 | |
| 88 | mfd_remove_devices(smsc->dev); |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static const struct i2c_device_id smsc_i2c_id[] = { |
| 94 | { "smscece1099", 0}, |
| 95 | {}, |
| 96 | }; |
| 97 | MODULE_DEVICE_TABLE(i2c, smsc_i2c_id); |
| 98 | |
| 99 | static struct i2c_driver smsc_i2c_driver = { |
| 100 | .driver = { |
| 101 | .name = "smsc", |
| 102 | .owner = THIS_MODULE, |
| 103 | }, |
| 104 | .probe = smsc_i2c_probe, |
| 105 | .remove = smsc_i2c_remove, |
| 106 | .id_table = smsc_i2c_id, |
| 107 | }; |
| 108 | |
| 109 | module_i2c_driver(smsc_i2c_driver); |
| 110 | |
| 111 | MODULE_AUTHOR("Sourav Poddar <sourav.poddar@ti.com>"); |
| 112 | MODULE_DESCRIPTION("SMSC chip multi-function driver"); |
| 113 | MODULE_LICENSE("GPL v2"); |