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
28int 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}
42EXPORT_SYMBOL(tps6105x_set);
43
44int 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}
59EXPORT_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 */
65int 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);
80fail:
81	mutex_unlock(&tps6105x->lock);
82	if (ret < 0)
83		return ret;
84
85	return 0;
86}
87EXPORT_SYMBOL(tps6105x_mask_and_set);
88
89static 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 */
125static 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
136static 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 = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
145	if (!tps6105x)
146		return -ENOMEM;
147
148	i2c_set_clientdata(client, tps6105x);
149	tps6105x->client = client;
150	pdata = dev_get_platdata(&client->dev);
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		return ret;
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	return mfd_add_devices(&client->dev, 0, tps6105x_cells,
191			       ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
192}
193
194static int tps6105x_remove(struct i2c_client *client)
195{
196	struct tps6105x *tps6105x = i2c_get_clientdata(client);
197
198	mfd_remove_devices(&client->dev);
199
200	/* Put chip in shutdown mode */
201	tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
202		TPS6105X_REG0_MODE_MASK,
203		TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
204
205	return 0;
206}
207
208static const struct i2c_device_id tps6105x_id[] = {
209	{ "tps61050", 0 },
210	{ "tps61052", 0 },
211	{ }
212};
213MODULE_DEVICE_TABLE(i2c, tps6105x_id);
214
215static struct i2c_driver tps6105x_driver = {
216	.driver = {
217		.name	= "tps6105x",
218	},
219	.probe		= tps6105x_probe,
220	.remove		= tps6105x_remove,
221	.id_table	= tps6105x_id,
222};
223
224static int __init tps6105x_init(void)
225{
226	return i2c_add_driver(&tps6105x_driver);
227}
228subsys_initcall(tps6105x_init);
229
230static void __exit tps6105x_exit(void)
231{
232	i2c_del_driver(&tps6105x_driver);
233}
234module_exit(tps6105x_exit);
235
236MODULE_AUTHOR("Linus Walleij");
237MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
238MODULE_LICENSE("GPL v2");
239