config: tegra3: enable /dev mount with ACL
[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/mfd/core.h>
23 #include <linux/regmap.h>
24 #include <linux/mfd/tps65910.h>
25 #include <linux/of_device.h>
26
27 static struct mfd_cell tps65910s[] = {
28         {
29                 .name = "tps65910-gpio",
30         },
31         {
32                 .name = "tps65910-pmic",
33         },
34         {
35                 .name = "tps65910-rtc",
36         },
37         {
38                 .name = "tps65910-power",
39         },
40 };
41
42
43 static bool is_volatile_reg(struct device *dev, unsigned int reg)
44 {
45         struct tps65910 *tps65910 = dev_get_drvdata(dev);
46
47         /*
48          * Caching all regulator registers.
49          * All regualator register address range is same for
50          * TPS65910 and TPS65911
51          */
52         if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
53                 /* Check for non-existing register */
54                 if (tps65910_chip_id(tps65910) == TPS65910)
55                         if ((reg == TPS65911_VDDCTRL_OP) ||
56                                 (reg == TPS65911_VDDCTRL_SR))
57                                 return true;
58                 return false;
59         }
60         return true;
61 }
62
63 static const struct regmap_config tps65910_regmap_config = {
64         .reg_bits = 8,
65         .val_bits = 8,
66         .volatile_reg = is_volatile_reg,
67         .max_register = TPS65910_MAX_REGISTER - 1,
68         .cache_type = REGCACHE_RBTREE,
69 };
70
71 static int __devinit tps65910_sleepinit(struct tps65910 *tps65910,
72                 struct tps65910_board *pmic_pdata)
73 {
74         struct device *dev = NULL;
75         int ret = 0;
76
77         dev = tps65910->dev;
78
79         if (!pmic_pdata->en_dev_slp)
80                 return 0;
81
82         /* enabling SLEEP device state */
83         ret = tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
84                                 DEVCTRL_DEV_SLP_MASK);
85         if (ret < 0) {
86                 dev_err(dev, "set dev_slp failed: %d\n", ret);
87                 goto err_sleep_init;
88         }
89
90         /* Return if there is no sleep keepon data. */
91         if (!pmic_pdata->slp_keepon)
92                 return 0;
93
94         if (pmic_pdata->slp_keepon->therm_keepon) {
95                 ret = tps65910_reg_set_bits(tps65910,
96                                 TPS65910_SLEEP_KEEP_RES_ON,
97                                 SLEEP_KEEP_RES_ON_THERM_KEEPON_MASK);
98                 if (ret < 0) {
99                         dev_err(dev, "set therm_keepon failed: %d\n", ret);
100                         goto disable_dev_slp;
101                 }
102         }
103
104         if (pmic_pdata->slp_keepon->clkout32k_keepon) {
105                 ret = tps65910_reg_set_bits(tps65910,
106                                 TPS65910_SLEEP_KEEP_RES_ON,
107                                 SLEEP_KEEP_RES_ON_CLKOUT32K_KEEPON_MASK);
108                 if (ret < 0) {
109                         dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
110                         goto disable_dev_slp;
111                 }
112         }
113
114         if (pmic_pdata->slp_keepon->i2chs_keepon) {
115                 ret = tps65910_reg_set_bits(tps65910,
116                                 TPS65910_SLEEP_KEEP_RES_ON,
117                                 SLEEP_KEEP_RES_ON_I2CHS_KEEPON_MASK);
118                 if (ret < 0) {
119                         dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
120                         goto disable_dev_slp;
121                 }
122         }
123
124         return 0;
125
126 disable_dev_slp:
127         tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
128                                 DEVCTRL_DEV_SLP_MASK);
129
130 err_sleep_init:
131         return ret;
132 }
133
134 #ifdef CONFIG_OF
135 static struct of_device_id tps65910_of_match[] = {
136         { .compatible = "ti,tps65910", .data = (void *)TPS65910},
137         { .compatible = "ti,tps65911", .data = (void *)TPS65911},
138         { },
139 };
140 MODULE_DEVICE_TABLE(of, tps65910_of_match);
141
142 static struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
143                                                 int *chip_id)
144 {
145         struct device_node *np = client->dev.of_node;
146         struct tps65910_board *board_info;
147         unsigned int prop;
148         const struct of_device_id *match;
149         unsigned int prop_array[TPS6591X_MAX_NUM_GPIO];
150         int ret = 0;
151         int idx;
152
153         match = of_match_device(tps65910_of_match, &client->dev);
154         if (!match) {
155                 dev_err(&client->dev, "Failed to find matching dt id\n");
156                 return NULL;
157         }
158
159         *chip_id  = (int)match->data;
160
161         board_info = devm_kzalloc(&client->dev, sizeof(*board_info),
162                         GFP_KERNEL);
163         if (!board_info) {
164                 dev_err(&client->dev, "Failed to allocate pdata\n");
165                 return NULL;
166         }
167
168         ret = of_property_read_u32(np, "ti,vmbch-threshold", &prop);
169         if (!ret)
170                 board_info->vmbch_threshold = prop;
171         else if (*chip_id == TPS65911)
172                 dev_warn(&client->dev, "VMBCH-Threshold not specified");
173
174         ret = of_property_read_u32(np, "ti,vmbch2-threshold", &prop);
175         if (!ret)
176                 board_info->vmbch2_threshold = prop;
177         else if (*chip_id == TPS65911)
178                 dev_warn(&client->dev, "VMBCH2-Threshold not specified");
179
180         ret = of_property_read_u32_array(np, "ti,en-gpio-sleep",
181                                    prop_array, TPS6591X_MAX_NUM_GPIO);
182         if (!ret)
183                 for (idx = 0; idx < ARRAY_SIZE(prop_array); idx++)
184                         board_info->en_gpio_sleep[idx] = (prop_array[idx] != 0);
185         else if (ret != -EINVAL) {
186                 dev_err(&client->dev,
187                         "error reading property ti,en-gpio-sleep: %d\n.", ret);
188                 return NULL;
189         }
190
191
192         board_info->irq = client->irq;
193         board_info->irq_base = -1;
194         board_info->gpio_base = -1;
195
196         return board_info;
197 }
198 #else
199 static inline
200 struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
201                                          int *chip_id)
202 {
203         return NULL;
204 }
205 #endif
206
207 static __devinit int tps65910_i2c_probe(struct i2c_client *i2c,
208                                         const struct i2c_device_id *id)
209 {
210         struct tps65910 *tps65910;
211         struct tps65910_board *pmic_plat_data;
212         struct tps65910_platform_data *init_data;
213         int ret = 0;
214         int chip_id = id->driver_data;
215
216         pmic_plat_data = dev_get_platdata(&i2c->dev);
217
218         if (!pmic_plat_data && i2c->dev.of_node)
219                 pmic_plat_data = tps65910_parse_dt(i2c, &chip_id);
220
221         if (!pmic_plat_data)
222                 return -EINVAL;
223
224         init_data = devm_kzalloc(&i2c->dev, sizeof(*init_data), GFP_KERNEL);
225         if (init_data == NULL)
226                 return -ENOMEM;
227
228         tps65910 = devm_kzalloc(&i2c->dev, sizeof(*tps65910), GFP_KERNEL);
229         if (tps65910 == NULL)
230                 return -ENOMEM;
231
232         i2c_set_clientdata(i2c, tps65910);
233         tps65910->dev = &i2c->dev;
234         tps65910->i2c_client = i2c;
235         tps65910->id = chip_id;
236         mutex_init(&tps65910->io_mutex);
237
238         tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
239         if (IS_ERR(tps65910->regmap)) {
240                 ret = PTR_ERR(tps65910->regmap);
241                 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
242                 return ret;
243         }
244
245         ret = mfd_add_devices(tps65910->dev, -1,
246                               tps65910s, ARRAY_SIZE(tps65910s),
247                               NULL, 0);
248         if (ret < 0) {
249                 dev_err(&i2c->dev, "mfd_add_devices failed: %d\n", ret);
250                 return ret;
251         }
252
253         init_data->irq = pmic_plat_data->irq;
254         init_data->irq_base = pmic_plat_data->irq_base;
255
256         tps65910_irq_init(tps65910, init_data->irq, init_data);
257
258         tps65910_sleepinit(tps65910, pmic_plat_data);
259
260         return ret;
261 }
262
263 static __devexit int tps65910_i2c_remove(struct i2c_client *i2c)
264 {
265         struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
266
267         tps65910_irq_exit(tps65910);
268         mfd_remove_devices(tps65910->dev);
269
270         return 0;
271 }
272
273 static const struct i2c_device_id tps65910_i2c_id[] = {
274        { "tps65910", TPS65910 },
275        { "tps65911", TPS65911 },
276        { }
277 };
278 MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
279
280
281 static struct i2c_driver tps65910_i2c_driver = {
282         .driver = {
283                    .name = "tps65910",
284                    .owner = THIS_MODULE,
285                    .of_match_table = of_match_ptr(tps65910_of_match),
286         },
287         .probe = tps65910_i2c_probe,
288         .remove = __devexit_p(tps65910_i2c_remove),
289         .id_table = tps65910_i2c_id,
290 };
291
292 static int __init tps65910_i2c_init(void)
293 {
294         return i2c_add_driver(&tps65910_i2c_driver);
295 }
296 /* init early so consumer devices can complete system boot */
297 subsys_initcall(tps65910_i2c_init);
298
299 static void __exit tps65910_i2c_exit(void)
300 {
301         i2c_del_driver(&tps65910_i2c_driver);
302 }
303 module_exit(tps65910_i2c_exit);
304
305 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
306 MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
307 MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
308 MODULE_LICENSE("GPL");