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, &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 
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