]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/mfd/tps6105x.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[karo-tx-linux.git] / drivers / mfd / tps6105x.c
1 /*
2  * Core driver for TPS61050/61052 boost converters, used for while LED
3  * driving, audio power amplification, white LED flash, and generic
4  * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
5  * and a flash synchronization pin to synchronize flash events when used as
6  * flashgun.
7  *
8  * Copyright (C) 2011 ST-Ericsson SA
9  * Written on behalf of Linaro for ST-Ericsson
10  *
11  * Author: Linus Walleij <linus.walleij@linaro.org>
12  *
13  * License terms: GNU General Public License (GPL) version 2
14  */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/i2c.h>
19 #include <linux/regmap.h>
20 #include <linux/gpio.h>
21 #include <linux/spinlock.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/mfd/core.h>
25 #include <linux/mfd/tps6105x.h>
26
27 static struct regmap_config tps6105x_regmap_config = {
28         .reg_bits = 8,
29         .val_bits = 8,
30         .max_register = TPS6105X_REG_3,
31 };
32
33 static int tps6105x_startup(struct tps6105x *tps6105x)
34 {
35         int ret;
36         unsigned int regval;
37
38         ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
39         if (ret)
40                 return ret;
41         switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
42         case TPS6105X_REG0_MODE_SHUTDOWN:
43                 dev_info(&tps6105x->client->dev,
44                          "TPS6105x found in SHUTDOWN mode\n");
45                 break;
46         case TPS6105X_REG0_MODE_TORCH:
47                 dev_info(&tps6105x->client->dev,
48                          "TPS6105x found in TORCH mode\n");
49                 break;
50         case TPS6105X_REG0_MODE_TORCH_FLASH:
51                 dev_info(&tps6105x->client->dev,
52                          "TPS6105x found in FLASH mode\n");
53                 break;
54         case TPS6105X_REG0_MODE_VOLTAGE:
55                 dev_info(&tps6105x->client->dev,
56                          "TPS6105x found in VOLTAGE mode\n");
57                 break;
58         default:
59                 break;
60         }
61
62         return ret;
63 }
64
65 /*
66  * MFD cells - we always have a GPIO cell and we have one cell
67  * which is selected operation mode.
68  */
69 static struct mfd_cell tps6105x_gpio_cell = {
70         .name = "tps6105x-gpio",
71 };
72
73 static struct mfd_cell tps6105x_leds_cell = {
74         .name = "tps6105x-leds",
75 };
76
77 static struct mfd_cell tps6105x_flash_cell = {
78         .name = "tps6105x-flash",
79 };
80
81 static struct mfd_cell tps6105x_regulator_cell = {
82         .name = "tps6105x-regulator",
83 };
84
85 static int tps6105x_add_device(struct tps6105x *tps6105x,
86                                struct mfd_cell *cell)
87 {
88         cell->platform_data = tps6105x;
89         cell->pdata_size = sizeof(*tps6105x);
90
91         return mfd_add_devices(&tps6105x->client->dev,
92                                PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
93 }
94
95 static int tps6105x_probe(struct i2c_client *client,
96                         const struct i2c_device_id *id)
97 {
98         struct tps6105x                 *tps6105x;
99         struct tps6105x_platform_data   *pdata;
100         int ret;
101
102         pdata = dev_get_platdata(&client->dev);
103         if (!pdata) {
104                 dev_err(&client->dev, "missing platform data\n");
105                 return -ENODEV;
106         }
107
108         tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
109         if (!tps6105x)
110                 return -ENOMEM;
111
112         tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
113         if (IS_ERR(tps6105x->regmap))
114                 return PTR_ERR(tps6105x->regmap);
115
116         i2c_set_clientdata(client, tps6105x);
117         tps6105x->client = client;
118         tps6105x->pdata = pdata;
119
120         ret = tps6105x_startup(tps6105x);
121         if (ret) {
122                 dev_err(&client->dev, "chip initialization failed\n");
123                 return ret;
124         }
125
126         ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
127         if (ret)
128                 return ret;
129
130         switch (pdata->mode) {
131         case TPS6105X_MODE_SHUTDOWN:
132                 dev_info(&client->dev,
133                          "present, not used for anything, only GPIO\n");
134                 break;
135         case TPS6105X_MODE_TORCH:
136                 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
137                 break;
138         case TPS6105X_MODE_TORCH_FLASH:
139                 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
140                 break;
141         case TPS6105X_MODE_VOLTAGE:
142                 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
143                 break;
144         default:
145                 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
146                 break;
147         }
148
149         if (ret)
150                 mfd_remove_devices(&client->dev);
151
152         return ret;
153 }
154
155 static int tps6105x_remove(struct i2c_client *client)
156 {
157         struct tps6105x *tps6105x = i2c_get_clientdata(client);
158
159         mfd_remove_devices(&client->dev);
160
161         /* Put chip in shutdown mode */
162         regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
163                 TPS6105X_REG0_MODE_MASK,
164                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
165
166         return 0;
167 }
168
169 static const struct i2c_device_id tps6105x_id[] = {
170         { "tps61050", 0 },
171         { "tps61052", 0 },
172         { }
173 };
174 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
175
176 static struct i2c_driver tps6105x_driver = {
177         .driver = {
178                 .name   = "tps6105x",
179         },
180         .probe          = tps6105x_probe,
181         .remove         = tps6105x_remove,
182         .id_table       = tps6105x_id,
183 };
184
185 static int __init tps6105x_init(void)
186 {
187         return i2c_add_driver(&tps6105x_driver);
188 }
189 subsys_initcall(tps6105x_init);
190
191 static void __exit tps6105x_exit(void)
192 {
193         i2c_del_driver(&tps6105x_driver);
194 }
195 module_exit(tps6105x_exit);
196
197 MODULE_AUTHOR("Linus Walleij");
198 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
199 MODULE_LICENSE("GPL v2");