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
tps6105x_startup(struct tps6105x * tps6105x)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, ®val);
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
tps6105x_add_device(struct tps6105x * tps6105x,struct mfd_cell * cell)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
tps6105x_parse_dt(struct device * dev)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
tps6105x_probe(struct i2c_client * client,const struct i2c_device_id * id)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
tps6105x_remove(struct i2c_client * client)182 static void 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
194 static const struct i2c_device_id tps6105x_id[] = {
195 { "tps61050", 0 },
196 { "tps61052", 0 },
197 { }
198 };
199 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
200
201 static const struct of_device_id tps6105x_of_match[] = {
202 { .compatible = "ti,tps61050" },
203 { .compatible = "ti,tps61052" },
204 { },
205 };
206 MODULE_DEVICE_TABLE(of, tps6105x_of_match);
207
208 static struct i2c_driver tps6105x_driver = {
209 .driver = {
210 .name = "tps6105x",
211 .of_match_table = tps6105x_of_match,
212 },
213 .probe = tps6105x_probe,
214 .remove = tps6105x_remove,
215 .id_table = tps6105x_id,
216 };
217
tps6105x_init(void)218 static int __init tps6105x_init(void)
219 {
220 return i2c_add_driver(&tps6105x_driver);
221 }
222 subsys_initcall(tps6105x_init);
223
tps6105x_exit(void)224 static void __exit tps6105x_exit(void)
225 {
226 i2c_del_driver(&tps6105x_driver);
227 }
228 module_exit(tps6105x_exit);
229
230 MODULE_AUTHOR("Linus Walleij");
231 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
232 MODULE_LICENSE("GPL v2");
233
