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1 /*
2  * tps65217.c
3  *
4  * TPS65217 chip family multi-function driver
5  *
6  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation version 2.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13  * kind, whether express or implied; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17 
18 #include <linux/kernel.h>
19 #include <linux/device.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/init.h>
23 #include <linux/i2c.h>
24 #include <linux/slab.h>
25 #include <linux/regmap.h>
26 #include <linux/err.h>
27 
28 #include <linux/mfd/core.h>
29 #include <linux/mfd/tps65217.h>
30 
31 /**
32  * tps65217_reg_read: Read a single tps65217 register.
33  *
34  * @tps: Device to read from.
35  * @reg: Register to read.
36  * @val: Contians the value
37  */
tps65217_reg_read(struct tps65217 * tps,unsigned int reg,unsigned int * val)38 int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
39 			unsigned int *val)
40 {
41 	return regmap_read(tps->regmap, reg, val);
42 }
43 EXPORT_SYMBOL_GPL(tps65217_reg_read);
44 
45 /**
46  * tps65217_reg_write: Write a single tps65217 register.
47  *
48  * @tps65217: Device to write to.
49  * @reg: Register to write to.
50  * @val: Value to write.
51  * @level: Password protected level
52  */
tps65217_reg_write(struct tps65217 * tps,unsigned int reg,unsigned int val,unsigned int level)53 int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
54 			unsigned int val, unsigned int level)
55 {
56 	int ret;
57 	unsigned int xor_reg_val;
58 
59 	switch (level) {
60 	case TPS65217_PROTECT_NONE:
61 		return regmap_write(tps->regmap, reg, val);
62 	case TPS65217_PROTECT_L1:
63 		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
64 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
65 							xor_reg_val);
66 		if (ret < 0)
67 			return ret;
68 
69 		return regmap_write(tps->regmap, reg, val);
70 	case TPS65217_PROTECT_L2:
71 		xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
72 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
73 							xor_reg_val);
74 		if (ret < 0)
75 			return ret;
76 		ret = regmap_write(tps->regmap, reg, val);
77 		if (ret < 0)
78 			return ret;
79 		ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
80 							xor_reg_val);
81 		if (ret < 0)
82 			return ret;
83 		return regmap_write(tps->regmap, reg, val);
84 	default:
85 		return -EINVAL;
86 	}
87 }
88 EXPORT_SYMBOL_GPL(tps65217_reg_write);
89 
90 /**
91  * tps65217_update_bits: Modify bits w.r.t mask, val and level.
92  *
93  * @tps65217: Device to write to.
94  * @reg: Register to read-write to.
95  * @mask: Mask.
96  * @val: Value to write.
97  * @level: Password protected level
98  */
tps65217_update_bits(struct tps65217 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)99 int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
100 		unsigned int mask, unsigned int val, unsigned int level)
101 {
102 	int ret;
103 	unsigned int data;
104 
105 	ret = tps65217_reg_read(tps, reg, &data);
106 	if (ret) {
107 		dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
108 		return ret;
109 	}
110 
111 	data &= ~mask;
112 	data |= val & mask;
113 
114 	ret = tps65217_reg_write(tps, reg, data, level);
115 	if (ret)
116 		dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
117 
118 	return ret;
119 }
120 
tps65217_set_bits(struct tps65217 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)121 int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
122 		unsigned int mask, unsigned int val, unsigned int level)
123 {
124 	return tps65217_update_bits(tps, reg, mask, val, level);
125 }
126 EXPORT_SYMBOL_GPL(tps65217_set_bits);
127 
tps65217_clear_bits(struct tps65217 * tps,unsigned int reg,unsigned int mask,unsigned int level)128 int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
129 		unsigned int mask, unsigned int level)
130 {
131 	return tps65217_update_bits(tps, reg, mask, 0, level);
132 }
133 EXPORT_SYMBOL_GPL(tps65217_clear_bits);
134 
135 static struct regmap_config tps65217_regmap_config = {
136 	.reg_bits = 8,
137 	.val_bits = 8,
138 };
139 
tps65217_probe(struct i2c_client * client,const struct i2c_device_id * ids)140 static int __devinit tps65217_probe(struct i2c_client *client,
141 				const struct i2c_device_id *ids)
142 {
143 	struct tps65217 *tps;
144 	struct tps65217_board *pdata = client->dev.platform_data;
145 	int i, ret;
146 	unsigned int version;
147 
148 	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
149 	if (!tps)
150 		return -ENOMEM;
151 
152 	tps->pdata = pdata;
153 	tps->regmap = regmap_init_i2c(client, &tps65217_regmap_config);
154 	if (IS_ERR(tps->regmap)) {
155 		ret = PTR_ERR(tps->regmap);
156 		dev_err(tps->dev, "Failed to allocate register map: %d\n",
157 			ret);
158 		return ret;
159 	}
160 
161 	i2c_set_clientdata(client, tps);
162 	tps->dev = &client->dev;
163 
164 	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
165 	if (ret < 0) {
166 		dev_err(tps->dev, "Failed to read revision"
167 					" register: %d\n", ret);
168 		goto err_regmap;
169 	}
170 
171 	dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
172 			(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
173 			version & TPS65217_CHIPID_REV_MASK);
174 
175 	for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
176 		struct platform_device *pdev;
177 
178 		pdev = platform_device_alloc("tps65217-pmic", i);
179 		if (!pdev) {
180 			dev_err(tps->dev, "Cannot create regulator %d\n", i);
181 			continue;
182 		}
183 
184 		pdev->dev.parent = tps->dev;
185 		platform_device_add_data(pdev, &pdata->tps65217_init_data[i],
186 					sizeof(pdata->tps65217_init_data[i]));
187 		tps->regulator_pdev[i] = pdev;
188 
189 		platform_device_add(pdev);
190 	}
191 
192 	return 0;
193 
194 err_regmap:
195 	regmap_exit(tps->regmap);
196 
197 	return ret;
198 }
199 
tps65217_remove(struct i2c_client * client)200 static int __devexit tps65217_remove(struct i2c_client *client)
201 {
202 	struct tps65217 *tps = i2c_get_clientdata(client);
203 	int i;
204 
205 	for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
206 		platform_device_unregister(tps->regulator_pdev[i]);
207 
208 	regmap_exit(tps->regmap);
209 
210 	return 0;
211 }
212 
213 static const struct i2c_device_id tps65217_id_table[] = {
214 	{"tps65217", 0xF0},
215 	{/* end of list */}
216 };
217 MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
218 
219 static struct i2c_driver tps65217_driver = {
220 	.driver		= {
221 		.name	= "tps65217",
222 	},
223 	.id_table	= tps65217_id_table,
224 	.probe		= tps65217_probe,
225 	.remove		= __devexit_p(tps65217_remove),
226 };
227 
tps65217_init(void)228 static int __init tps65217_init(void)
229 {
230 	return i2c_add_driver(&tps65217_driver);
231 }
232 subsys_initcall(tps65217_init);
233 
tps65217_exit(void)234 static void __exit tps65217_exit(void)
235 {
236 	i2c_del_driver(&tps65217_driver);
237 }
238 module_exit(tps65217_exit);
239 
240 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
241 MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
242 MODULE_LICENSE("GPL v2");
243