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
tps6105x_set(struct tps6105x * tps6105x,u8 reg,u8 value)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
tps6105x_get(struct tps6105x * tps6105x,u8 reg,u8 * buf)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 */
tps6105x_mask_and_set(struct tps6105x * tps6105x,u8 reg,u8 bitmask,u8 bitvalues)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
tps6105x_startup(struct tps6105x * tps6105x)89 static int __devinit tps6105x_startup(struct tps6105x *tps6105x)
90 {
91 int ret;
92 u8 regval;
93
94 ret = tps6105x_get(tps6105x, TPS6105X_REG_0, ®val);
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
tps6105x_probe(struct i2c_client * client,const struct i2c_device_id * id)136 static int __devinit 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);
192 if (ret)
193 goto fail;
194
195 return 0;
196
197 fail:
198 kfree(tps6105x);
199 return ret;
200 }
201
tps6105x_remove(struct i2c_client * client)202 static int __devexit 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 = __devexit_p(tps6105x_remove),
230 .id_table = tps6105x_id,
231 };
232
tps6105x_init(void)233 static int __init tps6105x_init(void)
234 {
235 return i2c_add_driver(&tps6105x_driver);
236 }
237 subsys_initcall(tps6105x_init);
238
tps6105x_exit(void)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");
248