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60aef7ce LJ |
1 | /* |
2 | * ST Thermal Sensor Driver core routines | |
3 | * Author: Ajit Pal Singh <ajitpal.singh@st.com> | |
4 | * | |
5 | * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/clk.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/of_device.h> | |
18 | ||
19 | #include "st_thermal.h" | |
20 | ||
21 | /* The Thermal Framework expects millidegrees */ | |
22 | #define mcelsius(temp) ((temp) * 1000) | |
23 | ||
24 | /* | |
25 | * Function to allocate regfields which are common | |
26 | * between syscfg and memory mapped based sensors | |
27 | */ | |
541d529f | 28 | static int st_thermal_alloc_regfields(struct st_thermal_sensor *sensor) |
60aef7ce LJ |
29 | { |
30 | struct device *dev = sensor->dev; | |
31 | struct regmap *regmap = sensor->regmap; | |
32 | const struct reg_field *reg_fields = sensor->cdata->reg_fields; | |
33 | ||
34 | sensor->dcorrect = devm_regmap_field_alloc(dev, regmap, | |
35 | reg_fields[DCORRECT]); | |
36 | ||
37 | sensor->overflow = devm_regmap_field_alloc(dev, regmap, | |
38 | reg_fields[OVERFLOW]); | |
39 | ||
40 | sensor->temp_data = devm_regmap_field_alloc(dev, regmap, | |
41 | reg_fields[DATA]); | |
42 | ||
43 | if (IS_ERR(sensor->dcorrect) || | |
44 | IS_ERR(sensor->overflow) || | |
45 | IS_ERR(sensor->temp_data)) { | |
46 | dev_err(dev, "failed to allocate common regfields\n"); | |
47 | return -EINVAL; | |
48 | } | |
49 | ||
50 | return sensor->ops->alloc_regfields(sensor); | |
51 | } | |
52 | ||
53 | static int st_thermal_sensor_on(struct st_thermal_sensor *sensor) | |
54 | { | |
55 | int ret; | |
56 | struct device *dev = sensor->dev; | |
57 | ||
58 | ret = clk_prepare_enable(sensor->clk); | |
59 | if (ret) { | |
60 | dev_err(dev, "failed to enable clk\n"); | |
61 | return ret; | |
62 | } | |
63 | ||
64 | ret = sensor->ops->power_ctrl(sensor, POWER_ON); | |
65 | if (ret) { | |
66 | dev_err(dev, "failed to power on sensor\n"); | |
67 | clk_disable_unprepare(sensor->clk); | |
68 | } | |
69 | ||
70 | return ret; | |
71 | } | |
72 | ||
73 | static int st_thermal_sensor_off(struct st_thermal_sensor *sensor) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | ret = sensor->ops->power_ctrl(sensor, POWER_OFF); | |
78 | if (ret) | |
79 | return ret; | |
80 | ||
81 | clk_disable_unprepare(sensor->clk); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int st_thermal_calibration(struct st_thermal_sensor *sensor) | |
87 | { | |
88 | int ret; | |
89 | unsigned int val; | |
90 | struct device *dev = sensor->dev; | |
91 | ||
92 | /* Check if sensor calibration data is already written */ | |
93 | ret = regmap_field_read(sensor->dcorrect, &val); | |
94 | if (ret) { | |
95 | dev_err(dev, "failed to read calibration data\n"); | |
96 | return ret; | |
97 | } | |
98 | ||
99 | if (!val) { | |
100 | /* | |
101 | * Sensor calibration value not set by bootloader, | |
102 | * default calibration data to be used | |
103 | */ | |
104 | ret = regmap_field_write(sensor->dcorrect, | |
105 | sensor->cdata->calibration_val); | |
106 | if (ret) | |
107 | dev_err(dev, "failed to set calibration data\n"); | |
108 | } | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
113 | /* Callback to get temperature from HW*/ | |
114 | static int st_thermal_get_temp(struct thermal_zone_device *th, | |
115 | unsigned long *temperature) | |
116 | { | |
117 | struct st_thermal_sensor *sensor = th->devdata; | |
118 | struct device *dev = sensor->dev; | |
119 | unsigned int temp; | |
120 | unsigned int overflow; | |
121 | int ret; | |
122 | ||
123 | ret = regmap_field_read(sensor->overflow, &overflow); | |
124 | if (ret) | |
125 | return ret; | |
126 | if (overflow) | |
127 | return -EIO; | |
128 | ||
129 | ret = regmap_field_read(sensor->temp_data, &temp); | |
130 | if (ret) | |
131 | return ret; | |
132 | ||
133 | temp += sensor->cdata->temp_adjust_val; | |
134 | temp = mcelsius(temp); | |
135 | ||
136 | dev_dbg(dev, "temperature: %d\n", temp); | |
137 | ||
138 | *temperature = temp; | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int st_thermal_get_trip_type(struct thermal_zone_device *th, | |
144 | int trip, enum thermal_trip_type *type) | |
145 | { | |
146 | struct st_thermal_sensor *sensor = th->devdata; | |
147 | struct device *dev = sensor->dev; | |
148 | ||
149 | switch (trip) { | |
150 | case 0: | |
151 | *type = THERMAL_TRIP_CRITICAL; | |
152 | break; | |
153 | default: | |
154 | dev_err(dev, "invalid trip point\n"); | |
155 | return -EINVAL; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int st_thermal_get_trip_temp(struct thermal_zone_device *th, | |
162 | int trip, unsigned long *temp) | |
163 | { | |
164 | struct st_thermal_sensor *sensor = th->devdata; | |
165 | struct device *dev = sensor->dev; | |
166 | ||
167 | switch (trip) { | |
168 | case 0: | |
169 | *temp = mcelsius(sensor->cdata->crit_temp); | |
170 | break; | |
171 | default: | |
172 | dev_err(dev, "Invalid trip point\n"); | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static struct thermal_zone_device_ops st_tz_ops = { | |
180 | .get_temp = st_thermal_get_temp, | |
181 | .get_trip_type = st_thermal_get_trip_type, | |
182 | .get_trip_temp = st_thermal_get_trip_temp, | |
183 | }; | |
184 | ||
185 | int st_thermal_register(struct platform_device *pdev, | |
186 | const struct of_device_id *st_thermal_of_match) | |
187 | { | |
188 | struct st_thermal_sensor *sensor; | |
189 | struct device *dev = &pdev->dev; | |
190 | struct device_node *np = dev->of_node; | |
191 | const struct of_device_id *match; | |
192 | ||
193 | int polling_delay; | |
194 | int ret; | |
195 | ||
196 | if (!np) { | |
197 | dev_err(dev, "device tree node not found\n"); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); | |
202 | if (!sensor) | |
203 | return -ENOMEM; | |
204 | ||
205 | sensor->dev = dev; | |
206 | ||
207 | match = of_match_device(st_thermal_of_match, dev); | |
208 | if (!(match && match->data)) | |
209 | return -EINVAL; | |
210 | ||
211 | sensor->cdata = match->data; | |
212 | if (!sensor->cdata->ops) | |
213 | return -EINVAL; | |
214 | ||
215 | sensor->ops = sensor->cdata->ops; | |
216 | ||
217 | ret = sensor->ops->regmap_init(sensor); | |
218 | if (ret) | |
219 | return ret; | |
220 | ||
221 | ret = st_thermal_alloc_regfields(sensor); | |
222 | if (ret) | |
223 | return ret; | |
224 | ||
225 | sensor->clk = devm_clk_get(dev, "thermal"); | |
226 | if (IS_ERR(sensor->clk)) { | |
227 | dev_err(dev, "failed to fetch clock\n"); | |
228 | return PTR_ERR(sensor->clk); | |
229 | } | |
230 | ||
231 | if (sensor->ops->register_enable_irq) { | |
232 | ret = sensor->ops->register_enable_irq(sensor); | |
233 | if (ret) | |
234 | return ret; | |
235 | } | |
236 | ||
237 | ret = st_thermal_sensor_on(sensor); | |
238 | if (ret) | |
239 | return ret; | |
240 | ||
241 | ret = st_thermal_calibration(sensor); | |
242 | if (ret) | |
243 | goto sensor_off; | |
244 | ||
245 | polling_delay = sensor->ops->register_enable_irq ? 0 : 1000; | |
246 | ||
247 | sensor->thermal_dev = | |
248 | thermal_zone_device_register(dev_name(dev), 1, 0, sensor, | |
249 | &st_tz_ops, NULL, 0, polling_delay); | |
250 | if (IS_ERR(sensor->thermal_dev)) { | |
251 | dev_err(dev, "failed to register thermal zone device\n"); | |
252 | ret = PTR_ERR(sensor->thermal_dev); | |
253 | goto sensor_off; | |
254 | } | |
255 | ||
256 | platform_set_drvdata(pdev, sensor); | |
257 | ||
258 | return 0; | |
259 | ||
260 | sensor_off: | |
261 | st_thermal_sensor_off(sensor); | |
262 | ||
263 | return ret; | |
264 | } | |
265 | EXPORT_SYMBOL_GPL(st_thermal_register); | |
266 | ||
267 | int st_thermal_unregister(struct platform_device *pdev) | |
268 | { | |
269 | struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
270 | ||
271 | st_thermal_sensor_off(sensor); | |
272 | thermal_zone_device_unregister(sensor->thermal_dev); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | EXPORT_SYMBOL_GPL(st_thermal_unregister); | |
277 | ||
e60a342b | 278 | #ifdef CONFIG_PM_SLEEP |
60aef7ce LJ |
279 | static int st_thermal_suspend(struct device *dev) |
280 | { | |
281 | struct platform_device *pdev = to_platform_device(dev); | |
282 | struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
283 | ||
284 | return st_thermal_sensor_off(sensor); | |
285 | } | |
286 | ||
287 | static int st_thermal_resume(struct device *dev) | |
288 | { | |
289 | int ret; | |
290 | struct platform_device *pdev = to_platform_device(dev); | |
291 | struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
292 | ||
293 | ret = st_thermal_sensor_on(sensor); | |
294 | if (ret) | |
295 | return ret; | |
296 | ||
297 | ret = st_thermal_calibration(sensor); | |
298 | if (ret) | |
299 | return ret; | |
300 | ||
301 | if (sensor->ops->enable_irq) { | |
302 | ret = sensor->ops->enable_irq(sensor); | |
303 | if (ret) | |
304 | return ret; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
e60a342b LJ |
309 | #endif |
310 | ||
60aef7ce LJ |
311 | SIMPLE_DEV_PM_OPS(st_thermal_pm_ops, st_thermal_suspend, st_thermal_resume); |
312 | EXPORT_SYMBOL_GPL(st_thermal_pm_ops); | |
313 | ||
314 | MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>"); | |
315 | MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver"); | |
316 | MODULE_LICENSE("GPL v2"); |