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07830d9a MK |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * An hwmon driver for the NXP MC34VR500 PMIC | |
4 | * | |
5 | * Author: Mario Kicherer <dev@kicherer.org> | |
6 | */ | |
7 | ||
8 | #include <linux/bits.h> | |
9 | #include <linux/dev_printk.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/errno.h> | |
13 | #include <linux/hwmon.h> | |
14 | #include <linux/i2c.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/irqreturn.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/of.h> | |
19 | #include <linux/regmap.h> | |
20 | ||
21 | #define MC34VR500_I2C_ADDR 0x08 | |
22 | #define MC34VR500_DEVICEID_VALUE 0x14 | |
23 | ||
24 | /* INTSENSE0 */ | |
25 | #define ENS_BIT BIT(0) | |
26 | #define LOWVINS_BIT BIT(1) | |
27 | #define THERM110S_BIT BIT(2) | |
28 | #define THERM120S_BIT BIT(3) | |
29 | #define THERM125S_BIT BIT(4) | |
30 | #define THERM130S_BIT BIT(5) | |
31 | ||
32 | #define MC34VR500_DEVICEID 0x00 | |
33 | ||
34 | #define MC34VR500_SILICONREVID 0x03 | |
35 | #define MC34VR500_FABID 0x04 | |
36 | #define MC34VR500_INTSTAT0 0x05 | |
37 | #define MC34VR500_INTMASK0 0x06 | |
38 | #define MC34VR500_INTSENSE0 0x07 | |
39 | ||
40 | struct mc34vr500_data { | |
41 | struct device *hwmon_dev; | |
42 | struct regmap *regmap; | |
43 | }; | |
44 | ||
45 | static irqreturn_t mc34vr500_process_interrupt(int irq, void *userdata) | |
46 | { | |
47 | struct mc34vr500_data *data = (struct mc34vr500_data *)userdata; | |
48 | unsigned int reg; | |
49 | int ret; | |
50 | ||
51 | ret = regmap_read(data->regmap, MC34VR500_INTSTAT0, ®); | |
52 | if (ret < 0) | |
53 | return IRQ_HANDLED; | |
54 | ||
55 | if (reg) { | |
56 | if (reg & LOWVINS_BIT) | |
57 | hwmon_notify_event(data->hwmon_dev, hwmon_in, | |
58 | hwmon_in_min_alarm, 0); | |
59 | ||
60 | if (reg & THERM110S_BIT) | |
61 | hwmon_notify_event(data->hwmon_dev, hwmon_temp, | |
62 | hwmon_temp_max_alarm, 0); | |
63 | ||
64 | if (reg & THERM120S_BIT) | |
65 | hwmon_notify_event(data->hwmon_dev, hwmon_temp, | |
66 | hwmon_temp_crit_alarm, 0); | |
67 | ||
68 | if (reg & THERM130S_BIT) | |
69 | hwmon_notify_event(data->hwmon_dev, hwmon_temp, | |
70 | hwmon_temp_emergency_alarm, 0); | |
71 | ||
72 | /* write 1 to clear */ | |
73 | regmap_write(data->regmap, MC34VR500_INTSTAT0, LOWVINS_BIT | | |
74 | THERM110S_BIT | THERM120S_BIT | THERM130S_BIT); | |
75 | } | |
76 | ||
77 | return IRQ_HANDLED; | |
78 | } | |
79 | ||
80 | static umode_t mc34vr500_is_visible(const void *data, | |
81 | enum hwmon_sensor_types type, | |
82 | u32 attr, int channel) | |
83 | { | |
84 | switch (attr) { | |
85 | case hwmon_in_min_alarm: | |
86 | case hwmon_temp_max_alarm: | |
87 | case hwmon_temp_crit_alarm: | |
88 | case hwmon_temp_emergency_alarm: | |
89 | return 0444; | |
90 | default: | |
91 | break; | |
92 | } | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int mc34vr500_alarm_read(struct mc34vr500_data *data, int index, | |
98 | long *val) | |
99 | { | |
100 | unsigned int reg; | |
101 | int ret; | |
102 | ||
103 | ret = regmap_read(data->regmap, MC34VR500_INTSENSE0, ®); | |
104 | if (ret < 0) | |
105 | return ret; | |
106 | ||
107 | *val = !!(reg & index); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static int mc34vr500_read(struct device *dev, enum hwmon_sensor_types type, | |
113 | u32 attr, int channel, long *val) | |
114 | { | |
115 | struct mc34vr500_data *data = dev_get_drvdata(dev); | |
116 | ||
117 | switch (type) { | |
118 | case hwmon_in: | |
119 | switch (attr) { | |
120 | case hwmon_in_min_alarm: | |
121 | return mc34vr500_alarm_read(data, LOWVINS_BIT, val); | |
122 | default: | |
123 | return -EOPNOTSUPP; | |
124 | } | |
125 | case hwmon_temp: | |
126 | switch (attr) { | |
127 | case hwmon_temp_max_alarm: | |
128 | return mc34vr500_alarm_read(data, THERM110S_BIT, val); | |
129 | case hwmon_temp_crit_alarm: | |
130 | return mc34vr500_alarm_read(data, THERM120S_BIT, val); | |
131 | case hwmon_temp_emergency_alarm: | |
132 | return mc34vr500_alarm_read(data, THERM130S_BIT, val); | |
133 | default: | |
134 | return -EOPNOTSUPP; | |
135 | } | |
136 | default: | |
137 | return -EOPNOTSUPP; | |
138 | } | |
139 | } | |
140 | ||
11305fd3 | 141 | static const struct hwmon_channel_info * const mc34vr500_info[] = { |
07830d9a MK |
142 | HWMON_CHANNEL_INFO(in, HWMON_I_MIN_ALARM), |
143 | HWMON_CHANNEL_INFO(temp, HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | |
144 | | HWMON_T_EMERGENCY_ALARM), | |
145 | NULL, | |
146 | }; | |
147 | ||
148 | static const struct hwmon_ops mc34vr500_hwmon_ops = { | |
149 | .is_visible = mc34vr500_is_visible, | |
150 | .read = mc34vr500_read, | |
151 | }; | |
152 | ||
153 | static const struct hwmon_chip_info mc34vr500_chip_info = { | |
154 | .ops = &mc34vr500_hwmon_ops, | |
155 | .info = mc34vr500_info, | |
156 | }; | |
157 | ||
158 | static const struct regmap_config mc34vr500_regmap_config = { | |
159 | .reg_bits = 8, | |
160 | .val_bits = 8, | |
161 | .max_register = MC34VR500_INTSENSE0, | |
162 | }; | |
163 | ||
164 | static int mc34vr500_probe(struct i2c_client *client) | |
165 | { | |
166 | struct device *dev = &client->dev; | |
167 | struct mc34vr500_data *data; | |
168 | struct device *hwmon_dev; | |
169 | int ret; | |
170 | unsigned int reg, revid, fabid; | |
171 | struct regmap *regmap; | |
172 | ||
173 | regmap = devm_regmap_init_i2c(client, &mc34vr500_regmap_config); | |
174 | if (IS_ERR(regmap)) | |
175 | return PTR_ERR(regmap); | |
176 | ||
177 | data = devm_kzalloc(dev, sizeof(struct mc34vr500_data), GFP_KERNEL); | |
178 | if (!data) | |
179 | return -ENOMEM; | |
180 | ||
181 | data->regmap = regmap; | |
182 | ||
183 | ret = regmap_read(regmap, MC34VR500_DEVICEID, ®); | |
184 | if (ret < 0) | |
185 | return ret; | |
186 | ||
187 | if (reg != MC34VR500_DEVICEID_VALUE) | |
188 | return -ENODEV; | |
189 | ||
190 | ret = regmap_read(regmap, MC34VR500_SILICONREVID, &revid); | |
191 | if (ret < 0) | |
192 | return ret; | |
193 | ||
194 | ret = regmap_read(regmap, MC34VR500_FABID, &fabid); | |
195 | if (ret < 0) | |
196 | return ret; | |
197 | ||
198 | dev_dbg(dev, "mc34vr500: revid 0x%x fabid 0x%x\n", revid, fabid); | |
199 | ||
200 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, | |
201 | data, | |
202 | &mc34vr500_chip_info, | |
203 | NULL); | |
204 | if (IS_ERR(hwmon_dev)) | |
205 | return PTR_ERR(hwmon_dev); | |
206 | ||
207 | data->hwmon_dev = hwmon_dev; | |
208 | ||
209 | if (client->irq) { | |
210 | ret = devm_request_threaded_irq(dev, client->irq, NULL, | |
211 | mc34vr500_process_interrupt, | |
212 | IRQF_TRIGGER_RISING | | |
213 | IRQF_ONESHOT | | |
214 | IRQF_SHARED, | |
215 | dev_name(dev), data); | |
216 | if (ret) | |
217 | return ret; | |
218 | ||
219 | /* write 1 to clear interrupts */ | |
220 | ret = regmap_write(regmap, MC34VR500_INTSTAT0, LOWVINS_BIT | | |
221 | THERM110S_BIT | THERM120S_BIT | | |
222 | THERM130S_BIT); | |
223 | if (ret) | |
224 | return ret; | |
225 | ||
226 | /* unmask interrupts */ | |
227 | ret = regmap_write(regmap, MC34VR500_INTMASK0, | |
228 | (unsigned int) ~(LOWVINS_BIT | THERM110S_BIT | | |
229 | THERM120S_BIT | THERM130S_BIT)); | |
230 | if (ret) | |
231 | return ret; | |
232 | } | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | static const struct i2c_device_id mc34vr500_id[] = { | |
238 | { "mc34vr500", 0 }, | |
239 | { }, | |
240 | }; | |
241 | MODULE_DEVICE_TABLE(i2c, mc34vr500_id); | |
242 | ||
243 | static const struct of_device_id __maybe_unused mc34vr500_of_match[] = { | |
244 | { .compatible = "nxp,mc34vr500" }, | |
245 | { }, | |
246 | }; | |
247 | MODULE_DEVICE_TABLE(of, mc34vr500_of_match); | |
248 | ||
249 | static struct i2c_driver mc34vr500_driver = { | |
250 | .driver = { | |
251 | .name = "mc34vr500", | |
252 | .of_match_table = of_match_ptr(mc34vr500_of_match), | |
253 | }, | |
1975d167 | 254 | .probe = mc34vr500_probe, |
07830d9a MK |
255 | .id_table = mc34vr500_id, |
256 | }; | |
257 | ||
258 | module_i2c_driver(mc34vr500_driver); | |
259 | ||
260 | MODULE_AUTHOR("Mario Kicherer <dev@kicherer.org>"); | |
261 | ||
262 | MODULE_DESCRIPTION("MC34VR500 driver"); | |
263 | MODULE_LICENSE("GPL"); |