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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60aef7ce LJ |
2 | /* |
3 | * ST Thermal Sensor Driver core routines | |
4 | * Author: Ajit Pal Singh <ajitpal.singh@st.com> | |
5 | * | |
6 | * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited | |
60aef7ce LJ |
7 | */ |
8 | ||
9 | #include <linux/clk.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/of.h> | |
12 | #include <linux/of_device.h> | |
13 | ||
14 | #include "st_thermal.h" | |
15 | ||
16 | /* The Thermal Framework expects millidegrees */ | |
17 | #define mcelsius(temp) ((temp) * 1000) | |
18 | ||
19 | /* | |
20 | * Function to allocate regfields which are common | |
21 | * between syscfg and memory mapped based sensors | |
22 | */ | |
541d529f | 23 | static int st_thermal_alloc_regfields(struct st_thermal_sensor *sensor) |
60aef7ce LJ |
24 | { |
25 | struct device *dev = sensor->dev; | |
26 | struct regmap *regmap = sensor->regmap; | |
27 | const struct reg_field *reg_fields = sensor->cdata->reg_fields; | |
28 | ||
29 | sensor->dcorrect = devm_regmap_field_alloc(dev, regmap, | |
30 | reg_fields[DCORRECT]); | |
31 | ||
32 | sensor->overflow = devm_regmap_field_alloc(dev, regmap, | |
33 | reg_fields[OVERFLOW]); | |
34 | ||
35 | sensor->temp_data = devm_regmap_field_alloc(dev, regmap, | |
36 | reg_fields[DATA]); | |
37 | ||
38 | if (IS_ERR(sensor->dcorrect) || | |
39 | IS_ERR(sensor->overflow) || | |
40 | IS_ERR(sensor->temp_data)) { | |
41 | dev_err(dev, "failed to allocate common regfields\n"); | |
42 | return -EINVAL; | |
43 | } | |
44 | ||
45 | return sensor->ops->alloc_regfields(sensor); | |
46 | } | |
47 | ||
48 | static int st_thermal_sensor_on(struct st_thermal_sensor *sensor) | |
49 | { | |
50 | int ret; | |
51 | struct device *dev = sensor->dev; | |
52 | ||
53 | ret = clk_prepare_enable(sensor->clk); | |
54 | if (ret) { | |
55 | dev_err(dev, "failed to enable clk\n"); | |
56 | return ret; | |
57 | } | |
58 | ||
59 | ret = sensor->ops->power_ctrl(sensor, POWER_ON); | |
60 | if (ret) { | |
61 | dev_err(dev, "failed to power on sensor\n"); | |
62 | clk_disable_unprepare(sensor->clk); | |
63 | } | |
64 | ||
65 | return ret; | |
66 | } | |
67 | ||
68 | static int st_thermal_sensor_off(struct st_thermal_sensor *sensor) | |
69 | { | |
70 | int ret; | |
71 | ||
72 | ret = sensor->ops->power_ctrl(sensor, POWER_OFF); | |
73 | if (ret) | |
74 | return ret; | |
75 | ||
76 | clk_disable_unprepare(sensor->clk); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static int st_thermal_calibration(struct st_thermal_sensor *sensor) | |
82 | { | |
83 | int ret; | |
84 | unsigned int val; | |
85 | struct device *dev = sensor->dev; | |
86 | ||
87 | /* Check if sensor calibration data is already written */ | |
88 | ret = regmap_field_read(sensor->dcorrect, &val); | |
89 | if (ret) { | |
90 | dev_err(dev, "failed to read calibration data\n"); | |
91 | return ret; | |
92 | } | |
93 | ||
94 | if (!val) { | |
95 | /* | |
96 | * Sensor calibration value not set by bootloader, | |
97 | * default calibration data to be used | |
98 | */ | |
99 | ret = regmap_field_write(sensor->dcorrect, | |
100 | sensor->cdata->calibration_val); | |
101 | if (ret) | |
102 | dev_err(dev, "failed to set calibration data\n"); | |
103 | } | |
104 | ||
105 | return ret; | |
106 | } | |
107 | ||
108 | /* Callback to get temperature from HW*/ | |
17e8351a | 109 | static int st_thermal_get_temp(struct thermal_zone_device *th, int *temperature) |
60aef7ce LJ |
110 | { |
111 | struct st_thermal_sensor *sensor = th->devdata; | |
112 | struct device *dev = sensor->dev; | |
113 | unsigned int temp; | |
114 | unsigned int overflow; | |
115 | int ret; | |
116 | ||
117 | ret = regmap_field_read(sensor->overflow, &overflow); | |
118 | if (ret) | |
119 | return ret; | |
120 | if (overflow) | |
121 | return -EIO; | |
122 | ||
123 | ret = regmap_field_read(sensor->temp_data, &temp); | |
124 | if (ret) | |
125 | return ret; | |
126 | ||
127 | temp += sensor->cdata->temp_adjust_val; | |
128 | temp = mcelsius(temp); | |
129 | ||
130 | dev_dbg(dev, "temperature: %d\n", temp); | |
131 | ||
132 | *temperature = temp; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int st_thermal_get_trip_type(struct thermal_zone_device *th, | |
138 | int trip, enum thermal_trip_type *type) | |
139 | { | |
140 | struct st_thermal_sensor *sensor = th->devdata; | |
141 | struct device *dev = sensor->dev; | |
142 | ||
143 | switch (trip) { | |
144 | case 0: | |
145 | *type = THERMAL_TRIP_CRITICAL; | |
146 | break; | |
147 | default: | |
148 | dev_err(dev, "invalid trip point\n"); | |
149 | return -EINVAL; | |
150 | } | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static int st_thermal_get_trip_temp(struct thermal_zone_device *th, | |
17e8351a | 156 | int trip, int *temp) |
60aef7ce LJ |
157 | { |
158 | struct st_thermal_sensor *sensor = th->devdata; | |
159 | struct device *dev = sensor->dev; | |
160 | ||
161 | switch (trip) { | |
162 | case 0: | |
163 | *temp = mcelsius(sensor->cdata->crit_temp); | |
164 | break; | |
165 | default: | |
166 | dev_err(dev, "Invalid trip point\n"); | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static struct thermal_zone_device_ops st_tz_ops = { | |
174 | .get_temp = st_thermal_get_temp, | |
175 | .get_trip_type = st_thermal_get_trip_type, | |
176 | .get_trip_temp = st_thermal_get_trip_temp, | |
177 | }; | |
178 | ||
179 | int st_thermal_register(struct platform_device *pdev, | |
180 | const struct of_device_id *st_thermal_of_match) | |
181 | { | |
182 | struct st_thermal_sensor *sensor; | |
183 | struct device *dev = &pdev->dev; | |
184 | struct device_node *np = dev->of_node; | |
185 | const struct of_device_id *match; | |
186 | ||
187 | int polling_delay; | |
188 | int ret; | |
189 | ||
190 | if (!np) { | |
191 | dev_err(dev, "device tree node not found\n"); | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); | |
196 | if (!sensor) | |
197 | return -ENOMEM; | |
198 | ||
199 | sensor->dev = dev; | |
200 | ||
201 | match = of_match_device(st_thermal_of_match, dev); | |
202 | if (!(match && match->data)) | |
203 | return -EINVAL; | |
204 | ||
205 | sensor->cdata = match->data; | |
206 | if (!sensor->cdata->ops) | |
207 | return -EINVAL; | |
208 | ||
209 | sensor->ops = sensor->cdata->ops; | |
210 | ||
331a5fc9 | 211 | ret = (sensor->ops->regmap_init)(sensor); |
60aef7ce LJ |
212 | if (ret) |
213 | return ret; | |
214 | ||
215 | ret = st_thermal_alloc_regfields(sensor); | |
216 | if (ret) | |
217 | return ret; | |
218 | ||
219 | sensor->clk = devm_clk_get(dev, "thermal"); | |
220 | if (IS_ERR(sensor->clk)) { | |
221 | dev_err(dev, "failed to fetch clock\n"); | |
222 | return PTR_ERR(sensor->clk); | |
223 | } | |
224 | ||
225 | if (sensor->ops->register_enable_irq) { | |
226 | ret = sensor->ops->register_enable_irq(sensor); | |
227 | if (ret) | |
228 | return ret; | |
229 | } | |
230 | ||
231 | ret = st_thermal_sensor_on(sensor); | |
232 | if (ret) | |
233 | return ret; | |
234 | ||
235 | ret = st_thermal_calibration(sensor); | |
236 | if (ret) | |
237 | goto sensor_off; | |
238 | ||
239 | polling_delay = sensor->ops->register_enable_irq ? 0 : 1000; | |
240 | ||
241 | sensor->thermal_dev = | |
242 | thermal_zone_device_register(dev_name(dev), 1, 0, sensor, | |
243 | &st_tz_ops, NULL, 0, polling_delay); | |
244 | if (IS_ERR(sensor->thermal_dev)) { | |
245 | dev_err(dev, "failed to register thermal zone device\n"); | |
246 | ret = PTR_ERR(sensor->thermal_dev); | |
247 | goto sensor_off; | |
248 | } | |
249 | ||
250 | platform_set_drvdata(pdev, sensor); | |
251 | ||
252 | return 0; | |
253 | ||
254 | sensor_off: | |
255 | st_thermal_sensor_off(sensor); | |
256 | ||
257 | return ret; | |
258 | } | |
259 | EXPORT_SYMBOL_GPL(st_thermal_register); | |
260 | ||
261 | int st_thermal_unregister(struct platform_device *pdev) | |
262 | { | |
263 | struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
264 | ||
265 | st_thermal_sensor_off(sensor); | |
266 | thermal_zone_device_unregister(sensor->thermal_dev); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(st_thermal_unregister); | |
271 | ||
e60a342b | 272 | #ifdef CONFIG_PM_SLEEP |
60aef7ce LJ |
273 | static int st_thermal_suspend(struct device *dev) |
274 | { | |
445ae758 | 275 | struct st_thermal_sensor *sensor = dev_get_drvdata(dev); |
60aef7ce LJ |
276 | |
277 | return st_thermal_sensor_off(sensor); | |
278 | } | |
279 | ||
280 | static int st_thermal_resume(struct device *dev) | |
281 | { | |
282 | int ret; | |
445ae758 | 283 | struct st_thermal_sensor *sensor = dev_get_drvdata(dev); |
60aef7ce LJ |
284 | |
285 | ret = st_thermal_sensor_on(sensor); | |
286 | if (ret) | |
287 | return ret; | |
288 | ||
289 | ret = st_thermal_calibration(sensor); | |
290 | if (ret) | |
291 | return ret; | |
292 | ||
293 | if (sensor->ops->enable_irq) { | |
294 | ret = sensor->ops->enable_irq(sensor); | |
295 | if (ret) | |
296 | return ret; | |
297 | } | |
298 | ||
299 | return 0; | |
300 | } | |
e60a342b LJ |
301 | #endif |
302 | ||
60aef7ce LJ |
303 | SIMPLE_DEV_PM_OPS(st_thermal_pm_ops, st_thermal_suspend, st_thermal_resume); |
304 | EXPORT_SYMBOL_GPL(st_thermal_pm_ops); | |
305 | ||
306 | MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>"); | |
307 | MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver"); | |
308 | MODULE_LICENSE("GPL v2"); |