Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 3adaec6c37dfd9b6b9271406eb9eaf8fdbd00db5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
// SPDX-License-Identifier: GPL-2.0-only
/*
 * AS3711 PMIC MFC driver
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/as3711.h>
#include <linux/mfd/core.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/slab.h>

enum {
	AS3711_REGULATOR,
	AS3711_BACKLIGHT,
};

/*
 * Ok to have it static: it is only used during probing and multiple I2C devices
 * cannot be probed simultaneously. Just make sure to avoid stale data.
 */
static struct mfd_cell as3711_subdevs[] = {
	[AS3711_REGULATOR] = {.name = "as3711-regulator",},
	[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
};

static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_GPIO_SIGNAL_IN:
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
	case AS3711_CHARGER_STATUS_1:
	case AS3711_CHARGER_STATUS_2:
	case AS3711_REG_STATUS:
		return true;
	}
	return false;
}

static bool as3711_precious_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
		return true;
	}
	return false;
}

static bool as3711_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_SD_1_VOLTAGE:
	case AS3711_SD_2_VOLTAGE:
	case AS3711_SD_3_VOLTAGE:
	case AS3711_SD_4_VOLTAGE:
	case AS3711_LDO_1_VOLTAGE:
	case AS3711_LDO_2_VOLTAGE:
	case AS3711_LDO_3_VOLTAGE:
	case AS3711_LDO_4_VOLTAGE:
	case AS3711_LDO_5_VOLTAGE:
	case AS3711_LDO_6_VOLTAGE:
	case AS3711_LDO_7_VOLTAGE:
	case AS3711_LDO_8_VOLTAGE:
	case AS3711_SD_CONTROL:
	case AS3711_GPIO_SIGNAL_OUT:
	case AS3711_GPIO_SIGNAL_IN:
	case AS3711_SD_CONTROL_1:
	case AS3711_SD_CONTROL_2:
	case AS3711_CURR_CONTROL:
	case AS3711_CURR1_VALUE:
	case AS3711_CURR2_VALUE:
	case AS3711_CURR3_VALUE:
	case AS3711_STEPUP_CONTROL_1:
	case AS3711_STEPUP_CONTROL_2:
	case AS3711_STEPUP_CONTROL_4:
	case AS3711_STEPUP_CONTROL_5:
	case AS3711_REG_STATUS:
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
	case AS3711_CHARGER_STATUS_1:
	case AS3711_CHARGER_STATUS_2:
	case AS3711_ASIC_ID_1:
	case AS3711_ASIC_ID_2:
		return true;
	}
	return false;
}

static const struct regmap_config as3711_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = as3711_volatile_reg,
	.readable_reg = as3711_readable_reg,
	.precious_reg = as3711_precious_reg,
	.max_register = AS3711_MAX_REG,
	.num_reg_defaults_raw = AS3711_NUM_REGS,
	.cache_type = REGCACHE_RBTREE,
};

#ifdef CONFIG_OF
static const struct of_device_id as3711_of_match[] = {
	{.compatible = "ams,as3711",},
	{}
};
#endif

static int as3711_i2c_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct as3711 *as3711;
	struct as3711_platform_data *pdata;
	unsigned int id1, id2;
	int ret;

	if (!client->dev.of_node) {
		pdata = dev_get_platdata(&client->dev);
		if (!pdata)
			dev_dbg(&client->dev, "Platform data not found\n");
	} else {
		pdata = devm_kzalloc(&client->dev,
				     sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;
	}

	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
	if (!as3711)
		return -ENOMEM;

	as3711->dev = &client->dev;
	i2c_set_clientdata(client, as3711);

	if (client->irq)
		dev_notice(&client->dev, "IRQ not supported yet\n");

	as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
	if (IS_ERR(as3711->regmap)) {
		ret = PTR_ERR(as3711->regmap);
		dev_err(&client->dev,
			"regmap initialization failed: %d\n", ret);
		return ret;
	}

	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
	if (!ret)
		ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
	if (ret < 0) {
		dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
		return ret;
	}
	if (id1 != 0x8b)
		return -ENODEV;
	dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);

	/*
	 * We can reuse as3711_subdevs[],
	 * it will be copied in mfd_add_devices()
	 */
	if (pdata) {
		as3711_subdevs[AS3711_REGULATOR].platform_data =
			&pdata->regulator;
		as3711_subdevs[AS3711_REGULATOR].pdata_size =
			sizeof(pdata->regulator);
		as3711_subdevs[AS3711_BACKLIGHT].platform_data =
			&pdata->backlight;
		as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
			sizeof(pdata->backlight);
	} else {
		as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
		as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
		as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
		as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
	}

	ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
				   ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
	if (ret < 0)
		dev_err(&client->dev, "add mfd devices failed: %d\n", ret);

	return ret;
}

static const struct i2c_device_id as3711_i2c_id[] = {
	{.name = "as3711", .driver_data = 0},
	{}
};

static struct i2c_driver as3711_i2c_driver = {
	.driver = {
		   .name = "as3711",
		   .of_match_table = of_match_ptr(as3711_of_match),
	},
	.probe = as3711_i2c_probe,
	.id_table = as3711_i2c_id,
};

static int __init as3711_i2c_init(void)
{
	return i2c_add_driver(&as3711_i2c_driver);
}
/* Initialise early */
subsys_initcall(as3711_i2c_init);