Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block
[firefly-linux-kernel-4.4.55.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/regulator/driver.h>
25 #include <linux/mfd/core.h>
26 #include <linux/mfd/tps6105x.h>
27
28 static struct regmap_config tps6105x_regmap_config = {
29         .reg_bits = 8,
30         .val_bits = 8,
31         .max_register = TPS6105X_REG_3,
32 };
33
34 static int tps6105x_startup(struct tps6105x *tps6105x)
35 {
36         int ret;
37         unsigned int regval;
38
39         ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
40         if (ret)
41                 return ret;
42         switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
43         case TPS6105X_REG0_MODE_SHUTDOWN:
44                 dev_info(&tps6105x->client->dev,
45                          "TPS6105x found in SHUTDOWN mode\n");
46                 break;
47         case TPS6105X_REG0_MODE_TORCH:
48                 dev_info(&tps6105x->client->dev,
49                          "TPS6105x found in TORCH mode\n");
50                 break;
51         case TPS6105X_REG0_MODE_TORCH_FLASH:
52                 dev_info(&tps6105x->client->dev,
53                          "TPS6105x found in FLASH mode\n");
54                 break;
55         case TPS6105X_REG0_MODE_VOLTAGE:
56                 dev_info(&tps6105x->client->dev,
57                          "TPS6105x found in VOLTAGE mode\n");
58                 break;
59         default:
60                 break;
61         }
62
63         return ret;
64 }
65
66 /*
67  * MFD cells - we always have a GPIO cell and we have one cell
68  * which is selected operation mode.
69  */
70 static struct mfd_cell tps6105x_gpio_cell = {
71         .name = "tps6105x-gpio",
72 };
73
74 static struct mfd_cell tps6105x_leds_cell = {
75         .name = "tps6105x-leds",
76 };
77
78 static struct mfd_cell tps6105x_flash_cell = {
79         .name = "tps6105x-flash",
80 };
81
82 static struct mfd_cell tps6105x_regulator_cell = {
83         .name = "tps6105x-regulator",
84 };
85
86 static int tps6105x_add_device(struct tps6105x *tps6105x,
87                                struct mfd_cell *cell)
88 {
89         cell->platform_data = tps6105x;
90         cell->pdata_size = sizeof(*tps6105x);
91
92         return mfd_add_devices(&tps6105x->client->dev,
93                                PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
94 }
95
96 static int tps6105x_probe(struct i2c_client *client,
97                         const struct i2c_device_id *id)
98 {
99         struct tps6105x                 *tps6105x;
100         struct tps6105x_platform_data   *pdata;
101         int ret;
102
103         pdata = dev_get_platdata(&client->dev);
104         if (!pdata) {
105                 dev_err(&client->dev, "missing platform data\n");
106                 return -ENODEV;
107         }
108
109         tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
110         if (!tps6105x)
111                 return -ENOMEM;
112
113         tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
114         if (IS_ERR(tps6105x->regmap))
115                 return PTR_ERR(tps6105x->regmap);
116
117         i2c_set_clientdata(client, tps6105x);
118         tps6105x->client = client;
119         tps6105x->pdata = pdata;
120
121         ret = tps6105x_startup(tps6105x);
122         if (ret) {
123                 dev_err(&client->dev, "chip initialization failed\n");
124                 return ret;
125         }
126
127         ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
128         if (ret)
129                 return ret;
130
131         switch (pdata->mode) {
132         case TPS6105X_MODE_SHUTDOWN:
133                 dev_info(&client->dev,
134                          "present, not used for anything, only GPIO\n");
135                 break;
136         case TPS6105X_MODE_TORCH:
137                 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
138                 break;
139         case TPS6105X_MODE_TORCH_FLASH:
140                 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
141                 break;
142         case TPS6105X_MODE_VOLTAGE:
143                 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
144                 break;
145         default:
146                 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
147                 break;
148         }
149
150         if (ret)
151                 mfd_remove_devices(&client->dev);
152
153         return ret;
154 }
155
156 static int tps6105x_remove(struct i2c_client *client)
157 {
158         struct tps6105x *tps6105x = i2c_get_clientdata(client);
159
160         mfd_remove_devices(&client->dev);
161
162         /* Put chip in shutdown mode */
163         regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
164                 TPS6105X_REG0_MODE_MASK,
165                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
166
167         return 0;
168 }
169
170 static const struct i2c_device_id tps6105x_id[] = {
171         { "tps61050", 0 },
172         { "tps61052", 0 },
173         { }
174 };
175 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
176
177 static struct i2c_driver tps6105x_driver = {
178         .driver = {
179                 .name   = "tps6105x",
180         },
181         .probe          = tps6105x_probe,
182         .remove         = tps6105x_remove,
183         .id_table       = tps6105x_id,
184 };
185
186 static int __init tps6105x_init(void)
187 {
188         return i2c_add_driver(&tps6105x_driver);
189 }
190 subsys_initcall(tps6105x_init);
191
192 static void __exit tps6105x_exit(void)
193 {
194         i2c_del_driver(&tps6105x_driver);
195 }
196 module_exit(tps6105x_exit);
197
198 MODULE_AUTHOR("Linus Walleij");
199 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
200 MODULE_LICENSE("GPL v2");