Merge remote-tracking branch 'torvalds/master' into perf/urgent
[linux-2.6-microblaze.git] / drivers / mfd / tps6105x.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Core driver for TPS61050/61052 boost converters, used for while LED
4  * driving, audio power amplification, white LED flash, and generic
5  * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
6  * and a flash synchronization pin to synchronize flash events when used as
7  * flashgun.
8  *
9  * Copyright (C) 2011 ST-Ericsson SA
10  * Written on behalf of Linaro for ST-Ericsson
11  *
12  * Author: Linus Walleij <linus.walleij@linaro.org>
13  */
14
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/i2c.h>
18 #include <linux/regmap.h>
19 #include <linux/gpio.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.h>
22 #include <linux/err.h>
23 #include <linux/mfd/core.h>
24 #include <linux/mfd/tps6105x.h>
25
26 static struct regmap_config tps6105x_regmap_config = {
27         .reg_bits = 8,
28         .val_bits = 8,
29         .max_register = TPS6105X_REG_3,
30 };
31
32 static int tps6105x_startup(struct tps6105x *tps6105x)
33 {
34         int ret;
35         unsigned int regval;
36
37         ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
38         if (ret)
39                 return ret;
40         switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
41         case TPS6105X_REG0_MODE_SHUTDOWN:
42                 dev_info(&tps6105x->client->dev,
43                          "TPS6105x found in SHUTDOWN mode\n");
44                 break;
45         case TPS6105X_REG0_MODE_TORCH:
46                 dev_info(&tps6105x->client->dev,
47                          "TPS6105x found in TORCH mode\n");
48                 break;
49         case TPS6105X_REG0_MODE_TORCH_FLASH:
50                 dev_info(&tps6105x->client->dev,
51                          "TPS6105x found in FLASH mode\n");
52                 break;
53         case TPS6105X_REG0_MODE_VOLTAGE:
54                 dev_info(&tps6105x->client->dev,
55                          "TPS6105x found in VOLTAGE mode\n");
56                 break;
57         default:
58                 break;
59         }
60
61         return ret;
62 }
63
64 /*
65  * MFD cells - we always have a GPIO cell and we have one cell
66  * which is selected operation mode.
67  */
68 static struct mfd_cell tps6105x_gpio_cell = {
69         .name = "tps6105x-gpio",
70 };
71
72 static struct mfd_cell tps6105x_leds_cell = {
73         .name = "tps6105x-leds",
74 };
75
76 static struct mfd_cell tps6105x_flash_cell = {
77         .name = "tps6105x-flash",
78 };
79
80 static struct mfd_cell tps6105x_regulator_cell = {
81         .name = "tps6105x-regulator",
82 };
83
84 static int tps6105x_add_device(struct tps6105x *tps6105x,
85                                struct mfd_cell *cell)
86 {
87         cell->platform_data = tps6105x;
88         cell->pdata_size = sizeof(*tps6105x);
89
90         return mfd_add_devices(&tps6105x->client->dev,
91                                PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
92 }
93
94 static struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev)
95 {
96         struct device_node *np = dev->of_node;
97         struct tps6105x_platform_data *pdata;
98         struct device_node *child;
99
100         if (!np)
101                 return ERR_PTR(-EINVAL);
102         if (of_get_available_child_count(np) > 1) {
103                 dev_err(dev, "cannot support multiple operational modes");
104                 return ERR_PTR(-EINVAL);
105         }
106         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
107         if (!pdata)
108                 return ERR_PTR(-ENOMEM);
109         pdata->mode = TPS6105X_MODE_SHUTDOWN;
110         for_each_available_child_of_node(np, child) {
111                 if (child->name && !of_node_cmp(child->name, "regulator"))
112                         pdata->mode = TPS6105X_MODE_VOLTAGE;
113                 else if (child->name && !of_node_cmp(child->name, "led"))
114                         pdata->mode = TPS6105X_MODE_TORCH;
115         }
116
117         return pdata;
118 }
119
120 static int tps6105x_probe(struct i2c_client *client,
121                         const struct i2c_device_id *id)
122 {
123         struct tps6105x                 *tps6105x;
124         struct tps6105x_platform_data   *pdata;
125         int ret;
126
127         pdata = dev_get_platdata(&client->dev);
128         if (!pdata)
129                 pdata = tps6105x_parse_dt(&client->dev);
130         if (IS_ERR(pdata)) {
131                 dev_err(&client->dev, "No platform data or DT found");
132                 return PTR_ERR(pdata);
133         }
134
135         tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
136         if (!tps6105x)
137                 return -ENOMEM;
138
139         tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
140         if (IS_ERR(tps6105x->regmap))
141                 return PTR_ERR(tps6105x->regmap);
142
143         i2c_set_clientdata(client, tps6105x);
144         tps6105x->client = client;
145         tps6105x->pdata = pdata;
146
147         ret = tps6105x_startup(tps6105x);
148         if (ret) {
149                 dev_err(&client->dev, "chip initialization failed\n");
150                 return ret;
151         }
152
153         ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
154         if (ret)
155                 return ret;
156
157         switch (pdata->mode) {
158         case TPS6105X_MODE_SHUTDOWN:
159                 dev_info(&client->dev,
160                          "present, not used for anything, only GPIO\n");
161                 break;
162         case TPS6105X_MODE_TORCH:
163                 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
164                 break;
165         case TPS6105X_MODE_TORCH_FLASH:
166                 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
167                 break;
168         case TPS6105X_MODE_VOLTAGE:
169                 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
170                 break;
171         default:
172                 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
173                 break;
174         }
175
176         if (ret)
177                 mfd_remove_devices(&client->dev);
178
179         return ret;
180 }
181
182 static int tps6105x_remove(struct i2c_client *client)
183 {
184         struct tps6105x *tps6105x = i2c_get_clientdata(client);
185
186         mfd_remove_devices(&client->dev);
187
188         /* Put chip in shutdown mode */
189         regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
190                 TPS6105X_REG0_MODE_MASK,
191                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
192
193         return 0;
194 }
195
196 static const struct i2c_device_id tps6105x_id[] = {
197         { "tps61050", 0 },
198         { "tps61052", 0 },
199         { }
200 };
201 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
202
203 static const struct of_device_id tps6105x_of_match[] = {
204         { .compatible = "ti,tps61050" },
205         { .compatible = "ti,tps61052" },
206         { },
207 };
208 MODULE_DEVICE_TABLE(of, tps6105x_of_match);
209
210 static struct i2c_driver tps6105x_driver = {
211         .driver = {
212                 .name   = "tps6105x",
213                 .of_match_table = tps6105x_of_match,
214         },
215         .probe          = tps6105x_probe,
216         .remove         = tps6105x_remove,
217         .id_table       = tps6105x_id,
218 };
219
220 static int __init tps6105x_init(void)
221 {
222         return i2c_add_driver(&tps6105x_driver);
223 }
224 subsys_initcall(tps6105x_init);
225
226 static void __exit tps6105x_exit(void)
227 {
228         i2c_del_driver(&tps6105x_driver);
229 }
230 module_exit(tps6105x_exit);
231
232 MODULE_AUTHOR("Linus Walleij");
233 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
234 MODULE_LICENSE("GPL v2");