1  // SPDX-License-Identifier: GPL-2.0-only
2  /*
3   * Driver for TPS65218 Integrated power management chipsets
4   *
5   * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
6   */
7  
8  #include <linux/kernel.h>
9  #include <linux/device.h>
10  #include <linux/module.h>
11  #include <linux/platform_device.h>
12  #include <linux/init.h>
13  #include <linux/i2c.h>
14  #include <linux/slab.h>
15  #include <linux/regmap.h>
16  #include <linux/err.h>
17  #include <linux/of.h>
18  #include <linux/irq.h>
19  #include <linux/interrupt.h>
20  #include <linux/mutex.h>
21  
22  #include <linux/mfd/core.h>
23  #include <linux/mfd/tps65218.h>
24  
25  #define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
26  
27  static const struct mfd_cell tps65218_cells[] = {
28  	{
29  		.name = "tps65218-pwrbutton",
30  		.of_compatible = "ti,tps65218-pwrbutton",
31  	},
32  	{
33  		.name = "tps65218-gpio",
34  		.of_compatible = "ti,tps65218-gpio",
35  	},
36  	{ .name = "tps65218-regulator", },
37  };
38  
39  /**
40   * tps65218_reg_write: Write a single tps65218 register.
41   *
42   * @tps: Device to write to.
43   * @reg: Register to write to.
44   * @val: Value to write.
45   * @level: Password protected level
46   */
tps65218_reg_write(struct tps65218 * tps,unsigned int reg,unsigned int val,unsigned int level)47  int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
48  			unsigned int val, unsigned int level)
49  {
50  	int ret;
51  	unsigned int xor_reg_val;
52  
53  	switch (level) {
54  	case TPS65218_PROTECT_NONE:
55  		return regmap_write(tps->regmap, reg, val);
56  	case TPS65218_PROTECT_L1:
57  		xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
58  		ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
59  							xor_reg_val);
60  		if (ret < 0)
61  			return ret;
62  
63  		return regmap_write(tps->regmap, reg, val);
64  	default:
65  		return -EINVAL;
66  	}
67  }
68  EXPORT_SYMBOL_GPL(tps65218_reg_write);
69  
70  /**
71   * tps65218_update_bits: Modify bits w.r.t mask, val and level.
72   *
73   * @tps: Device to write to.
74   * @reg: Register to read-write to.
75   * @mask: Mask.
76   * @val: Value to write.
77   * @level: Password protected level
78   */
tps65218_update_bits(struct tps65218 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)79  static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
80  		unsigned int mask, unsigned int val, unsigned int level)
81  {
82  	int ret;
83  	unsigned int data;
84  
85  	ret = regmap_read(tps->regmap, reg, &data);
86  	if (ret) {
87  		dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
88  		return ret;
89  	}
90  
91  	data &= ~mask;
92  	data |= val & mask;
93  
94  	mutex_lock(&tps->tps_lock);
95  	ret = tps65218_reg_write(tps, reg, data, level);
96  	if (ret)
97  		dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
98  	mutex_unlock(&tps->tps_lock);
99  
100  	return ret;
101  }
102  
tps65218_set_bits(struct tps65218 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)103  int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
104  		unsigned int mask, unsigned int val, unsigned int level)
105  {
106  	return tps65218_update_bits(tps, reg, mask, val, level);
107  }
108  EXPORT_SYMBOL_GPL(tps65218_set_bits);
109  
tps65218_clear_bits(struct tps65218 * tps,unsigned int reg,unsigned int mask,unsigned int level)110  int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
111  		unsigned int mask, unsigned int level)
112  {
113  	return tps65218_update_bits(tps, reg, mask, 0, level);
114  }
115  EXPORT_SYMBOL_GPL(tps65218_clear_bits);
116  
117  static const struct regmap_range tps65218_yes_ranges[] = {
118  	regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
119  	regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
120  };
121  
122  static const struct regmap_access_table tps65218_volatile_table = {
123  	.yes_ranges = tps65218_yes_ranges,
124  	.n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
125  };
126  
127  static const struct regmap_config tps65218_regmap_config = {
128  	.reg_bits = 8,
129  	.val_bits = 8,
130  	.cache_type = REGCACHE_MAPLE,
131  	.volatile_table = &tps65218_volatile_table,
132  };
133  
134  static const struct regmap_irq tps65218_irqs[] = {
135  	/* INT1 IRQs */
136  	[TPS65218_PRGC_IRQ] = {
137  		.mask = TPS65218_INT1_PRGC,
138  	},
139  	[TPS65218_CC_AQC_IRQ] = {
140  		.mask = TPS65218_INT1_CC_AQC,
141  	},
142  	[TPS65218_HOT_IRQ] = {
143  		.mask = TPS65218_INT1_HOT,
144  	},
145  	[TPS65218_PB_IRQ] = {
146  		.mask = TPS65218_INT1_PB,
147  	},
148  	[TPS65218_AC_IRQ] = {
149  		.mask = TPS65218_INT1_AC,
150  	},
151  	[TPS65218_VPRG_IRQ] = {
152  		.mask = TPS65218_INT1_VPRG,
153  	},
154  	[TPS65218_INVALID1_IRQ] = {
155  	},
156  	[TPS65218_INVALID2_IRQ] = {
157  	},
158  	/* INT2 IRQs*/
159  	[TPS65218_LS1_I_IRQ] = {
160  		.mask = TPS65218_INT2_LS1_I,
161  		.reg_offset = 1,
162  	},
163  	[TPS65218_LS2_I_IRQ] = {
164  		.mask = TPS65218_INT2_LS2_I,
165  		.reg_offset = 1,
166  	},
167  	[TPS65218_LS3_I_IRQ] = {
168  		.mask = TPS65218_INT2_LS3_I,
169  		.reg_offset = 1,
170  	},
171  	[TPS65218_LS1_F_IRQ] = {
172  		.mask = TPS65218_INT2_LS1_F,
173  		.reg_offset = 1,
174  	},
175  	[TPS65218_LS2_F_IRQ] = {
176  		.mask = TPS65218_INT2_LS2_F,
177  		.reg_offset = 1,
178  	},
179  	[TPS65218_LS3_F_IRQ] = {
180  		.mask = TPS65218_INT2_LS3_F,
181  		.reg_offset = 1,
182  	},
183  	[TPS65218_INVALID3_IRQ] = {
184  	},
185  	[TPS65218_INVALID4_IRQ] = {
186  	},
187  };
188  
189  static const struct regmap_irq_chip tps65218_irq_chip = {
190  	.name = "tps65218",
191  	.irqs = tps65218_irqs,
192  	.num_irqs = ARRAY_SIZE(tps65218_irqs),
193  
194  	.num_regs = 2,
195  	.mask_base = TPS65218_REG_INT_MASK1,
196  	.status_base = TPS65218_REG_INT1,
197  };
198  
199  static const struct of_device_id of_tps65218_match_table[] = {
200  	{ .compatible = "ti,tps65218", },
201  	{}
202  };
203  MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
204  
tps65218_voltage_set_strict(struct tps65218 * tps)205  static int tps65218_voltage_set_strict(struct tps65218 *tps)
206  {
207  	u32 strict;
208  
209  	if (of_property_read_u32(tps->dev->of_node,
210  				 "ti,strict-supply-voltage-supervision",
211  				 &strict))
212  		return 0;
213  
214  	if (strict != 0 && strict != 1) {
215  		dev_err(tps->dev,
216  			"Invalid ti,strict-supply-voltage-supervision value\n");
217  		return -EINVAL;
218  	}
219  
220  	tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
221  			     TPS65218_CONFIG1_STRICT,
222  			     strict ? TPS65218_CONFIG1_STRICT : 0,
223  			     TPS65218_PROTECT_L1);
224  	return 0;
225  }
226  
tps65218_voltage_set_uv_hyst(struct tps65218 * tps)227  static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
228  {
229  	u32 hyst;
230  
231  	if (of_property_read_u32(tps->dev->of_node,
232  				 "ti,under-voltage-hyst-microvolt", &hyst))
233  		return 0;
234  
235  	if (hyst != 400000 && hyst != 200000) {
236  		dev_err(tps->dev,
237  			"Invalid ti,under-voltage-hyst-microvolt value\n");
238  		return -EINVAL;
239  	}
240  
241  	tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
242  			     TPS65218_CONFIG2_UVLOHYS,
243  			     hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
244  			     TPS65218_PROTECT_L1);
245  	return 0;
246  }
247  
tps65218_voltage_set_uvlo(struct tps65218 * tps)248  static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
249  {
250  	u32 uvlo;
251  	int uvloval;
252  
253  	if (of_property_read_u32(tps->dev->of_node,
254  				 "ti,under-voltage-limit-microvolt", &uvlo))
255  		return 0;
256  
257  	switch (uvlo) {
258  	case 2750000:
259  		uvloval = TPS65218_CONFIG1_UVLO_2750000;
260  		break;
261  	case 2950000:
262  		uvloval = TPS65218_CONFIG1_UVLO_2950000;
263  		break;
264  	case 3250000:
265  		uvloval = TPS65218_CONFIG1_UVLO_3250000;
266  		break;
267  	case 3350000:
268  		uvloval = TPS65218_CONFIG1_UVLO_3350000;
269  		break;
270  	default:
271  		dev_err(tps->dev,
272  			"Invalid ti,under-voltage-limit-microvolt value\n");
273  		return -EINVAL;
274  	}
275  
276  	tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
277  			     TPS65218_CONFIG1_UVLO_MASK, uvloval,
278  			     TPS65218_PROTECT_L1);
279  	return 0;
280  }
281  
tps65218_probe(struct i2c_client * client)282  static int tps65218_probe(struct i2c_client *client)
283  {
284  	struct tps65218 *tps;
285  	int ret;
286  	unsigned int chipid;
287  
288  	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
289  	if (!tps)
290  		return -ENOMEM;
291  
292  	i2c_set_clientdata(client, tps);
293  	tps->dev = &client->dev;
294  	tps->irq = client->irq;
295  	tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
296  	if (IS_ERR(tps->regmap)) {
297  		ret = PTR_ERR(tps->regmap);
298  		dev_err(tps->dev, "Failed to allocate register map: %d\n",
299  			ret);
300  		return ret;
301  	}
302  
303  	mutex_init(&tps->tps_lock);
304  
305  	ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq,
306  				       IRQF_ONESHOT, 0, &tps65218_irq_chip,
307  				       &tps->irq_data);
308  	if (ret < 0)
309  		return ret;
310  
311  	ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
312  	if (ret) {
313  		dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
314  		return ret;
315  	}
316  
317  	tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
318  
319  	ret = tps65218_voltage_set_strict(tps);
320  	if (ret)
321  		return ret;
322  
323  	ret = tps65218_voltage_set_uvlo(tps);
324  	if (ret)
325  		return ret;
326  
327  	ret = tps65218_voltage_set_uv_hyst(tps);
328  	if (ret)
329  		return ret;
330  
331  	ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
332  			      ARRAY_SIZE(tps65218_cells), NULL, 0,
333  			      regmap_irq_get_domain(tps->irq_data));
334  
335  	return ret;
336  }
337  
338  static const struct i2c_device_id tps65218_id_table[] = {
339  	{ "tps65218", TPS65218 },
340  	{ },
341  };
342  MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
343  
344  static struct i2c_driver tps65218_driver = {
345  	.driver		= {
346  		.name	= "tps65218",
347  		.of_match_table = of_tps65218_match_table,
348  	},
349  	.probe		= tps65218_probe,
350  	.id_table       = tps65218_id_table,
351  };
352  
353  module_i2c_driver(tps65218_driver);
354  
355  MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
356  MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
357  MODULE_LICENSE("GPL v2");
358