aboutsummaryrefslogtreecommitdiff
path: root/drivers/regulator/anatop-regulator.c
blob: 3660bace123c97adc3f3ce4e1165216655578a3d (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
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/mfd/anatop.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

struct anatop_regulator {
	const char *name;
	u32 control_reg;
	struct anatop *mfd;
	int vol_bit_shift;
	int vol_bit_width;
	int min_bit_val;
	int min_voltage;
	int max_voltage;
	struct regulator_desc rdesc;
	struct regulator_init_data *initdata;
};

static int anatop_set_voltage(struct regulator_dev *reg, int min_uV,
				  int max_uV, unsigned *selector)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
	u32 val, sel, mask;
	int uv;

	uv = min_uV;
	dev_dbg(&reg->dev, "%s: uv %d, min %d, max %d\n", __func__,
		uv, anatop_reg->min_voltage,
		anatop_reg->max_voltage);

	if (uv < anatop_reg->min_voltage) {
		if (max_uV > anatop_reg->min_voltage)
			uv = anatop_reg->min_voltage;
		else
			return -EINVAL;
	}

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	sel = DIV_ROUND_UP(uv - anatop_reg->min_voltage, 25000);
	if (sel * 25000 + anatop_reg->min_voltage > anatop_reg->max_voltage)
		return -EINVAL;
	val = anatop_reg->min_bit_val + sel;
	*selector = sel;
	dev_dbg(&reg->dev, "%s: calculated val %d\n", __func__, val);
	mask = ((1 << anatop_reg->vol_bit_width) - 1) <<
		anatop_reg->vol_bit_shift;
	val <<= anatop_reg->vol_bit_shift;
	anatop_write_reg(anatop_reg->mfd, anatop_reg->control_reg, val, mask);

	return 0;
}

static int anatop_get_voltage_sel(struct regulator_dev *reg)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
	u32 val;

	if (!anatop_reg->control_reg)
		return -ENOTSUPP;

	val = anatop_read_reg(anatop_reg->mfd, anatop_reg->control_reg);
	val = (val & ((1 << anatop_reg->vol_bit_width) - 1)) >>
		anatop_reg->vol_bit_shift;

	return val - anatop_reg->min_bit_val;
}

static int anatop_list_voltage(struct regulator_dev *reg, unsigned selector)
{
	struct anatop_regulator *anatop_reg = rdev_get_drvdata(reg);
	int uv;

	uv = anatop_reg->min_voltage + selector * 25000;
	dev_dbg(&reg->dev, "vddio = %d, selector = %u\n", uv, selector);

	return uv;
}

static struct regulator_ops anatop_rops = {
	.set_voltage     = anatop_set_voltage,
	.get_voltage_sel = anatop_get_voltage_sel,
	.list_voltage    = anatop_list_voltage,
};

static int __devinit anatop_regulator_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct regulator_desc *rdesc;
	struct regulator_dev *rdev;
	struct anatop_regulator *sreg;
	struct regulator_init_data *initdata;
	struct anatop *anatopmfd = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = { };
	int ret = 0;

	initdata = of_get_regulator_init_data(dev, np);
	sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
	if (!sreg)
		return -ENOMEM;
	sreg->initdata = initdata;
	sreg->name = kstrdup(of_get_property(np, "regulator-name", NULL),
			     GFP_KERNEL);
	rdesc = &sreg->rdesc;
	memset(rdesc, 0, sizeof(*rdesc));
	rdesc->name = sreg->name;
	rdesc->ops = &anatop_rops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->owner = THIS_MODULE;
	sreg->mfd = anatopmfd;
	ret = of_property_read_u32(np, "anatop-reg-offset",
				   &sreg->control_reg);
	if (ret) {
		dev_err(dev, "no anatop-reg-offset property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-width",
				   &sreg->vol_bit_width);
	if (ret) {
		dev_err(dev, "no anatop-vol-bit-width property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-vol-bit-shift",
				   &sreg->vol_bit_shift);
	if (ret) {
		dev_err(dev, "no anatop-vol-bit-shift property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-min-bit-val",
				   &sreg->min_bit_val);
	if (ret) {
		dev_err(dev, "no anatop-min-bit-val property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-min-voltage",
				   &sreg->min_voltage);
	if (ret) {
		dev_err(dev, "no anatop-min-voltage property set\n");
		goto anatop_probe_end;
	}
	ret = of_property_read_u32(np, "anatop-max-voltage",
				   &sreg->max_voltage);
	if (ret) {
		dev_err(dev, "no anatop-max-voltage property set\n");
		goto anatop_probe_end;
	}

	rdesc->n_voltages = (sreg->max_voltage - sreg->min_voltage)
		/ 25000 + 1;

	config.dev = &pdev->dev;
	config.init_data = initdata;
	config.driver_data = sreg;
	config.of_node = pdev->dev.of_node;

	/* register regulator */
	rdev = regulator_register(rdesc, &config);
	if (IS_ERR(rdev)) {
		dev_err(dev, "failed to register %s\n",
			rdesc->name);
		ret = PTR_ERR(rdev);
		goto anatop_probe_end;
	}

	platform_set_drvdata(pdev, rdev);

anatop_probe_end:
	if (ret)
		kfree(sreg->name);

	return ret;
}

static int __devexit anatop_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	struct anatop_regulator *sreg = rdev_get_drvdata(rdev);
	const char *name = sreg->name;

	regulator_unregister(rdev);
	kfree(name);

	return 0;
}

static struct of_device_id __devinitdata of_anatop_regulator_match_tbl[] = {
	{ .compatible = "fsl,anatop-regulator", },
	{ /* end */ }
};

static struct platform_driver anatop_regulator_driver = {
	.driver = {
		.name	= "anatop_regulator",
		.owner  = THIS_MODULE,
		.of_match_table = of_anatop_regulator_match_tbl,
	},
	.probe	= anatop_regulator_probe,
	.remove	= anatop_regulator_remove,
};

static int __init anatop_regulator_init(void)
{
	return platform_driver_register(&anatop_regulator_driver);
}
postcore_initcall(anatop_regulator_init);

static void __exit anatop_regulator_exit(void)
{
	platform_driver_unregister(&anatop_regulator_driver);
}
module_exit(anatop_regulator_exit);

MODULE_AUTHOR("Nancy Chen <Nancy.Chen@freescale.com>, "
	      "Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>");
MODULE_DESCRIPTION("ANATOP Regulator driver");
MODULE_LICENSE("GPL v2");