xref: /openbmc/linux/drivers/mfd/tps65218.c (revision c819e2cf)
1 /*
2  * Driver for TPS65218 Integrated power management chipsets
3  *
4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11  * kind, whether expressed or implied; without even the implied warranty
12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License version 2 for more details.
14  */
15 
16 #include <linux/kernel.h>
17 #include <linux/device.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/init.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
23 #include <linux/regmap.h>
24 #include <linux/err.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/irq.h>
28 #include <linux/interrupt.h>
29 #include <linux/mutex.h>
30 
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/tps65218.h>
33 
34 #define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
35 
36 /**
37  * tps65218_reg_read: Read a single tps65218 register.
38  *
39  * @tps: Device to read from.
40  * @reg: Register to read.
41  * @val: Contians the value
42  */
43 int tps65218_reg_read(struct tps65218 *tps, unsigned int reg,
44 			unsigned int *val)
45 {
46 	return regmap_read(tps->regmap, reg, val);
47 }
48 EXPORT_SYMBOL_GPL(tps65218_reg_read);
49 
50 /**
51  * tps65218_reg_write: Write a single tps65218 register.
52  *
53  * @tps65218: Device to write to.
54  * @reg: Register to write to.
55  * @val: Value to write.
56  * @level: Password protected level
57  */
58 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
59 			unsigned int val, unsigned int level)
60 {
61 	int ret;
62 	unsigned int xor_reg_val;
63 
64 	switch (level) {
65 	case TPS65218_PROTECT_NONE:
66 		return regmap_write(tps->regmap, reg, val);
67 	case TPS65218_PROTECT_L1:
68 		xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
69 		ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
70 							xor_reg_val);
71 		if (ret < 0)
72 			return ret;
73 
74 		return regmap_write(tps->regmap, reg, val);
75 	default:
76 		return -EINVAL;
77 	}
78 }
79 EXPORT_SYMBOL_GPL(tps65218_reg_write);
80 
81 /**
82  * tps65218_update_bits: Modify bits w.r.t mask, val and level.
83  *
84  * @tps65218: Device to write to.
85  * @reg: Register to read-write to.
86  * @mask: Mask.
87  * @val: Value to write.
88  * @level: Password protected level
89  */
90 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
91 		unsigned int mask, unsigned int val, unsigned int level)
92 {
93 	int ret;
94 	unsigned int data;
95 
96 	ret = tps65218_reg_read(tps, reg, &data);
97 	if (ret) {
98 		dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
99 		return ret;
100 	}
101 
102 	data &= ~mask;
103 	data |= val & mask;
104 
105 	mutex_lock(&tps->tps_lock);
106 	ret = tps65218_reg_write(tps, reg, data, level);
107 	if (ret)
108 		dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
109 	mutex_unlock(&tps->tps_lock);
110 
111 	return ret;
112 }
113 
114 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
115 		unsigned int mask, unsigned int val, unsigned int level)
116 {
117 	return tps65218_update_bits(tps, reg, mask, val, level);
118 }
119 EXPORT_SYMBOL_GPL(tps65218_set_bits);
120 
121 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
122 		unsigned int mask, unsigned int level)
123 {
124 	return tps65218_update_bits(tps, reg, mask, 0, level);
125 }
126 EXPORT_SYMBOL_GPL(tps65218_clear_bits);
127 
128 static const struct regmap_range tps65218_yes_ranges[] = {
129 	regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
130 	regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
131 };
132 
133 static const struct regmap_access_table tps65218_volatile_table = {
134 	.yes_ranges = tps65218_yes_ranges,
135 	.n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
136 };
137 
138 static struct regmap_config tps65218_regmap_config = {
139 	.reg_bits = 8,
140 	.val_bits = 8,
141 	.cache_type = REGCACHE_RBTREE,
142 	.volatile_table = &tps65218_volatile_table,
143 };
144 
145 static const struct regmap_irq tps65218_irqs[] = {
146 	/* INT1 IRQs */
147 	[TPS65218_PRGC_IRQ] = {
148 		.mask = TPS65218_INT1_PRGC,
149 	},
150 	[TPS65218_CC_AQC_IRQ] = {
151 		.mask = TPS65218_INT1_CC_AQC,
152 	},
153 	[TPS65218_HOT_IRQ] = {
154 		.mask = TPS65218_INT1_HOT,
155 	},
156 	[TPS65218_PB_IRQ] = {
157 		.mask = TPS65218_INT1_PB,
158 	},
159 	[TPS65218_AC_IRQ] = {
160 		.mask = TPS65218_INT1_AC,
161 	},
162 	[TPS65218_VPRG_IRQ] = {
163 		.mask = TPS65218_INT1_VPRG,
164 	},
165 	[TPS65218_INVALID1_IRQ] = {
166 	},
167 	[TPS65218_INVALID2_IRQ] = {
168 	},
169 	/* INT2 IRQs*/
170 	[TPS65218_LS1_I_IRQ] = {
171 		.mask = TPS65218_INT2_LS1_I,
172 		.reg_offset = 1,
173 	},
174 	[TPS65218_LS2_I_IRQ] = {
175 		.mask = TPS65218_INT2_LS2_I,
176 		.reg_offset = 1,
177 	},
178 	[TPS65218_LS3_I_IRQ] = {
179 		.mask = TPS65218_INT2_LS3_I,
180 		.reg_offset = 1,
181 	},
182 	[TPS65218_LS1_F_IRQ] = {
183 		.mask = TPS65218_INT2_LS1_F,
184 		.reg_offset = 1,
185 	},
186 	[TPS65218_LS2_F_IRQ] = {
187 		.mask = TPS65218_INT2_LS2_F,
188 		.reg_offset = 1,
189 	},
190 	[TPS65218_LS3_F_IRQ] = {
191 		.mask = TPS65218_INT2_LS3_F,
192 		.reg_offset = 1,
193 	},
194 	[TPS65218_INVALID3_IRQ] = {
195 	},
196 	[TPS65218_INVALID4_IRQ] = {
197 	},
198 };
199 
200 static struct regmap_irq_chip tps65218_irq_chip = {
201 	.name = "tps65218",
202 	.irqs = tps65218_irqs,
203 	.num_irqs = ARRAY_SIZE(tps65218_irqs),
204 
205 	.num_regs = 2,
206 	.mask_base = TPS65218_REG_INT_MASK1,
207 	.status_base = TPS65218_REG_INT1,
208 };
209 
210 static const struct of_device_id of_tps65218_match_table[] = {
211 	{ .compatible = "ti,tps65218", },
212 	{}
213 };
214 
215 static int tps65218_probe(struct i2c_client *client,
216 				const struct i2c_device_id *ids)
217 {
218 	struct tps65218 *tps;
219 	const struct of_device_id *match;
220 	int ret;
221 
222 	match = of_match_device(of_tps65218_match_table, &client->dev);
223 	if (!match) {
224 		dev_err(&client->dev,
225 			"Failed to find matching dt id\n");
226 		return -EINVAL;
227 	}
228 
229 	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
230 	if (!tps)
231 		return -ENOMEM;
232 
233 	i2c_set_clientdata(client, tps);
234 	tps->dev = &client->dev;
235 	tps->irq = client->irq;
236 	tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
237 	if (IS_ERR(tps->regmap)) {
238 		ret = PTR_ERR(tps->regmap);
239 		dev_err(tps->dev, "Failed to allocate register map: %d\n",
240 			ret);
241 		return ret;
242 	}
243 
244 	mutex_init(&tps->tps_lock);
245 
246 	ret = regmap_add_irq_chip(tps->regmap, tps->irq,
247 			IRQF_ONESHOT, 0, &tps65218_irq_chip,
248 			&tps->irq_data);
249 	if (ret < 0)
250 		return ret;
251 
252 	ret = of_platform_populate(client->dev.of_node, NULL, NULL,
253 				   &client->dev);
254 	if (ret < 0)
255 		goto err_irq;
256 
257 	return 0;
258 
259 err_irq:
260 	regmap_del_irq_chip(tps->irq, tps->irq_data);
261 
262 	return ret;
263 }
264 
265 static int tps65218_remove(struct i2c_client *client)
266 {
267 	struct tps65218 *tps = i2c_get_clientdata(client);
268 
269 	regmap_del_irq_chip(tps->irq, tps->irq_data);
270 
271 	return 0;
272 }
273 
274 static const struct i2c_device_id tps65218_id_table[] = {
275 	{ "tps65218", TPS65218 },
276 	{ },
277 };
278 MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
279 
280 static struct i2c_driver tps65218_driver = {
281 	.driver		= {
282 		.name	= "tps65218",
283 		.owner	= THIS_MODULE,
284 		.of_match_table = of_tps65218_match_table,
285 	},
286 	.probe		= tps65218_probe,
287 	.remove		= tps65218_remove,
288 	.id_table       = tps65218_id_table,
289 };
290 
291 module_i2c_driver(tps65218_driver);
292 
293 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
294 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
295 MODULE_LICENSE("GPL v2");
296