Merge tag 'firewire-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee139...
[platform/adaptation/renesas_rcar/renesas_kernel.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/mutex.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 int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value)
29 {
30         int ret;
31
32         ret = mutex_lock_interruptible(&tps6105x->lock);
33         if (ret)
34                 return ret;
35         ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value);
36         mutex_unlock(&tps6105x->lock);
37         if (ret < 0)
38                 return ret;
39
40         return 0;
41 }
42 EXPORT_SYMBOL(tps6105x_set);
43
44 int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf)
45 {
46         int ret;
47
48         ret = mutex_lock_interruptible(&tps6105x->lock);
49         if (ret)
50                 return ret;
51         ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
52         mutex_unlock(&tps6105x->lock);
53         if (ret < 0)
54                 return ret;
55
56         *buf = ret;
57         return 0;
58 }
59 EXPORT_SYMBOL(tps6105x_get);
60
61 /*
62  * Masks off the bits in the mask and sets the bits in the bitvalues
63  * parameter in one atomic operation
64  */
65 int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
66                           u8 bitmask, u8 bitvalues)
67 {
68         int ret;
69         u8 regval;
70
71         ret = mutex_lock_interruptible(&tps6105x->lock);
72         if (ret)
73                 return ret;
74         ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
75         if (ret < 0)
76                 goto fail;
77         regval = ret;
78         regval = (~bitmask & regval) | (bitmask & bitvalues);
79         ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval);
80 fail:
81         mutex_unlock(&tps6105x->lock);
82         if (ret < 0)
83                 return ret;
84
85         return 0;
86 }
87 EXPORT_SYMBOL(tps6105x_mask_and_set);
88
89 static int tps6105x_startup(struct tps6105x *tps6105x)
90 {
91         int ret;
92         u8 regval;
93
94         ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
95         if (ret)
96                 return ret;
97         switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
98         case TPS6105X_REG0_MODE_SHUTDOWN:
99                 dev_info(&tps6105x->client->dev,
100                          "TPS6105x found in SHUTDOWN mode\n");
101                 break;
102         case TPS6105X_REG0_MODE_TORCH:
103                 dev_info(&tps6105x->client->dev,
104                          "TPS6105x found in TORCH mode\n");
105                 break;
106         case TPS6105X_REG0_MODE_TORCH_FLASH:
107                 dev_info(&tps6105x->client->dev,
108                          "TPS6105x found in FLASH mode\n");
109                 break;
110         case TPS6105X_REG0_MODE_VOLTAGE:
111                 dev_info(&tps6105x->client->dev,
112                          "TPS6105x found in VOLTAGE mode\n");
113                 break;
114         default:
115                 break;
116         }
117
118         return ret;
119 }
120
121 /*
122  * MFD cells - we have one cell which is selected operation
123  * mode, and we always have a GPIO cell.
124  */
125 static struct mfd_cell tps6105x_cells[] = {
126         {
127                 /* name will be runtime assigned */
128                 .id = -1,
129         },
130         {
131                 .name = "tps6105x-gpio",
132                 .id = -1,
133         },
134 };
135
136 static int tps6105x_probe(struct i2c_client *client,
137                         const struct i2c_device_id *id)
138 {
139         struct tps6105x                 *tps6105x;
140         struct tps6105x_platform_data   *pdata;
141         int ret;
142         int i;
143
144         tps6105x = kmalloc(sizeof(*tps6105x), GFP_KERNEL);
145         if (!tps6105x)
146                 return -ENOMEM;
147
148         i2c_set_clientdata(client, tps6105x);
149         tps6105x->client = client;
150         pdata = client->dev.platform_data;
151         tps6105x->pdata = pdata;
152         mutex_init(&tps6105x->lock);
153
154         ret = tps6105x_startup(tps6105x);
155         if (ret) {
156                 dev_err(&client->dev, "chip initialization failed\n");
157                 goto fail;
158         }
159
160         /* Remove warning texts when you implement new cell drivers */
161         switch (pdata->mode) {
162         case TPS6105X_MODE_SHUTDOWN:
163                 dev_info(&client->dev,
164                          "present, not used for anything, only GPIO\n");
165                 break;
166         case TPS6105X_MODE_TORCH:
167                 tps6105x_cells[0].name = "tps6105x-leds";
168                 dev_warn(&client->dev,
169                          "torch mode is unsupported\n");
170                 break;
171         case TPS6105X_MODE_TORCH_FLASH:
172                 tps6105x_cells[0].name = "tps6105x-flash";
173                 dev_warn(&client->dev,
174                          "flash mode is unsupported\n");
175                 break;
176         case TPS6105X_MODE_VOLTAGE:
177                 tps6105x_cells[0].name ="tps6105x-regulator";
178                 break;
179         default:
180                 break;
181         }
182
183         /* Set up and register the platform devices. */
184         for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
185                 /* One state holder for all drivers, this is simple */
186                 tps6105x_cells[i].platform_data = tps6105x;
187                 tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
188         }
189
190         ret = mfd_add_devices(&client->dev, 0, tps6105x_cells,
191                               ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
192         if (ret)
193                 goto fail;
194
195         return 0;
196
197 fail:
198         kfree(tps6105x);
199         return ret;
200 }
201
202 static int tps6105x_remove(struct i2c_client *client)
203 {
204         struct tps6105x *tps6105x = i2c_get_clientdata(client);
205
206         mfd_remove_devices(&client->dev);
207
208         /* Put chip in shutdown mode */
209         tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
210                 TPS6105X_REG0_MODE_MASK,
211                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
212
213         kfree(tps6105x);
214         return 0;
215 }
216
217 static const struct i2c_device_id tps6105x_id[] = {
218         { "tps61050", 0 },
219         { "tps61052", 0 },
220         { }
221 };
222 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
223
224 static struct i2c_driver tps6105x_driver = {
225         .driver = {
226                 .name   = "tps6105x",
227         },
228         .probe          = tps6105x_probe,
229         .remove         = tps6105x_remove,
230         .id_table       = tps6105x_id,
231 };
232
233 static int __init tps6105x_init(void)
234 {
235         return i2c_add_driver(&tps6105x_driver);
236 }
237 subsys_initcall(tps6105x_init);
238
239 static void __exit tps6105x_exit(void)
240 {
241         i2c_del_driver(&tps6105x_driver);
242 }
243 module_exit(tps6105x_exit);
244
245 MODULE_AUTHOR("Linus Walleij");
246 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
247 MODULE_LICENSE("GPL v2");