pktgen: correctly handle failures when adding a device
[linux-2.6.git] / drivers / mfd / tps65910.c
1 /*
2  * tps65910.c  --  TI TPS6591x
3  *
4  * Copyright 2010 Texas Instruments Inc.
5  *
6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
7  * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
8  *
9  *  This program is free software; you can redistribute it and/or modify it
10  *  under  the terms of the GNU General  Public License as published by the
11  *  Free Software Foundation;  either version 2 of the License, or (at your
12  *  option) any later version.
13  *
14  */
15
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/init.h>
19 #include <linux/err.h>
20 #include <linux/slab.h>
21 #include <linux/i2c.h>
22 #include <linux/gpio.h>
23 #include <linux/mfd/core.h>
24 #include <linux/regmap.h>
25 #include <linux/mfd/tps65910.h>
26
27 static struct mfd_cell tps65910s[] = {
28         {
29                 .name = "tps65910-pmic",
30         },
31         {
32                 .name = "tps65910-rtc",
33         },
34         {
35                 .name = "tps65910-power",
36         },
37 };
38
39
40 static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
41                                   int bytes, void *dest)
42 {
43         return regmap_bulk_read(tps65910->regmap, reg, dest, bytes);
44 }
45
46 static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
47                                   int bytes, void *src)
48 {
49         return regmap_bulk_write(tps65910->regmap, reg, src, bytes);
50 }
51
52 int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
53 {
54         return regmap_update_bits(tps65910->regmap, reg, mask, mask);
55 }
56 EXPORT_SYMBOL_GPL(tps65910_set_bits);
57
58 int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
59 {
60         return regmap_update_bits(tps65910->regmap, reg, mask, 0);
61 }
62 EXPORT_SYMBOL_GPL(tps65910_clear_bits);
63
64 static bool is_volatile_reg(struct device *dev, unsigned int reg)
65 {
66         struct tps65910 *tps65910 = dev_get_drvdata(dev);
67
68         /*
69          * Caching all regulator registers.
70          * All regualator register address range is same for
71          * TPS65910 and TPS65911
72          */
73         if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
74                 /* Check for non-existing register */
75                 if (tps65910_chip_id(tps65910) == TPS65910)
76                         if ((reg == TPS65911_VDDCTRL_OP) ||
77                                 (reg == TPS65911_VDDCTRL_SR))
78                                 return true;
79                 return false;
80         }
81         return true;
82 }
83
84 static const struct regmap_config tps65910_regmap_config = {
85         .reg_bits = 8,
86         .val_bits = 8,
87         .volatile_reg = is_volatile_reg,
88         .max_register = TPS65910_MAX_REGISTER,
89         .num_reg_defaults_raw = TPS65910_MAX_REGISTER,
90         .cache_type = REGCACHE_RBTREE,
91 };
92
93 static int tps65910_i2c_probe(struct i2c_client *i2c,
94                             const struct i2c_device_id *id)
95 {
96         struct tps65910 *tps65910;
97         struct tps65910_board *pmic_plat_data;
98         struct tps65910_platform_data *init_data;
99         int ret = 0;
100
101         pmic_plat_data = dev_get_platdata(&i2c->dev);
102         if (!pmic_plat_data)
103                 return -EINVAL;
104
105         init_data = kzalloc(sizeof(struct tps65910_platform_data), GFP_KERNEL);
106         if (init_data == NULL)
107                 return -ENOMEM;
108
109         tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
110         if (tps65910 == NULL) {
111                 kfree(init_data);
112                 return -ENOMEM;
113         }
114
115         i2c_set_clientdata(i2c, tps65910);
116         tps65910->dev = &i2c->dev;
117         tps65910->i2c_client = i2c;
118         tps65910->id = id->driver_data;
119         tps65910->read = tps65910_i2c_read;
120         tps65910->write = tps65910_i2c_write;
121         mutex_init(&tps65910->io_mutex);
122
123         tps65910->regmap = regmap_init_i2c(i2c, &tps65910_regmap_config);
124         if (IS_ERR(tps65910->regmap)) {
125                 ret = PTR_ERR(tps65910->regmap);
126                 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
127                 goto regmap_err;
128         }
129
130         ret = mfd_add_devices(tps65910->dev, -1,
131                               tps65910s, ARRAY_SIZE(tps65910s),
132                               NULL, 0);
133         if (ret < 0)
134                 goto err;
135
136         init_data->irq = pmic_plat_data->irq;
137         init_data->irq_base = pmic_plat_data->irq_base;
138
139         tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
140
141         tps65910_irq_init(tps65910, init_data->irq, init_data);
142
143         kfree(init_data);
144         return ret;
145
146 err:
147         regmap_exit(tps65910->regmap);
148 regmap_err:
149         kfree(tps65910);
150         kfree(init_data);
151         return ret;
152 }
153
154 static int tps65910_i2c_remove(struct i2c_client *i2c)
155 {
156         struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
157
158         tps65910_irq_exit(tps65910);
159         mfd_remove_devices(tps65910->dev);
160         regmap_exit(tps65910->regmap);
161         kfree(tps65910);
162
163         return 0;
164 }
165
166 static const struct i2c_device_id tps65910_i2c_id[] = {
167        { "tps65910", TPS65910 },
168        { "tps65911", TPS65911 },
169        { }
170 };
171 MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
172
173
174 static struct i2c_driver tps65910_i2c_driver = {
175         .driver = {
176                    .name = "tps65910",
177                    .owner = THIS_MODULE,
178         },
179         .probe = tps65910_i2c_probe,
180         .remove = tps65910_i2c_remove,
181         .id_table = tps65910_i2c_id,
182 };
183
184 static int __init tps65910_i2c_init(void)
185 {
186         return i2c_add_driver(&tps65910_i2c_driver);
187 }
188 /* init early so consumer devices can complete system boot */
189 subsys_initcall(tps65910_i2c_init);
190
191 static void __exit tps65910_i2c_exit(void)
192 {
193         i2c_del_driver(&tps65910_i2c_driver);
194 }
195 module_exit(tps65910_i2c_exit);
196
197 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
198 MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
199 MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
200 MODULE_LICENSE("GPL");