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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*/ | |
17e8351a | 114 | static int st_thermal_get_temp(struct thermal_zone_device *th, int *temperature) |
60aef7ce LJ |
115 | { |
116 | struct st_thermal_sensor *sensor = th->devdata; | |
117 | struct device *dev = sensor->dev; | |
118 | unsigned int temp; | |
119 | unsigned int overflow; | |
120 | int ret; | |
121 | ||
122 | ret = regmap_field_read(sensor->overflow, &overflow); | |
123 | if (ret) | |
124 | return ret; | |
125 | if (overflow) | |
126 | return -EIO; | |
127 | ||
128 | ret = regmap_field_read(sensor->temp_data, &temp); | |
129 | if (ret) | |
130 | return ret; | |
131 | ||
132 | temp += sensor->cdata->temp_adjust_val; | |
133 | temp = mcelsius(temp); | |
134 | ||
135 | dev_dbg(dev, "temperature: %d\n", temp); | |
136 | ||
137 | *temperature = temp; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int st_thermal_get_trip_type(struct thermal_zone_device *th, | |
143 | int trip, enum thermal_trip_type *type) | |
144 | { | |
145 | struct st_thermal_sensor *sensor = th->devdata; | |
146 | struct device *dev = sensor->dev; | |
147 | ||
148 | switch (trip) { | |
149 | case 0: | |
150 | *type = THERMAL_TRIP_CRITICAL; | |
151 | break; | |
152 | default: | |
153 | dev_err(dev, "invalid trip point\n"); | |
154 | return -EINVAL; | |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int st_thermal_get_trip_temp(struct thermal_zone_device *th, | |
17e8351a | 161 | int trip, int *temp) |
60aef7ce LJ |
162 | { |
163 | struct st_thermal_sensor *sensor = th->devdata; | |
164 | struct device *dev = sensor->dev; | |
165 | ||
166 | switch (trip) { | |
167 | case 0: | |
168 | *temp = mcelsius(sensor->cdata->crit_temp); | |
169 | break; | |
170 | default: | |
171 | dev_err(dev, "Invalid trip point\n"); | |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static struct thermal_zone_device_ops st_tz_ops = { | |
179 | .get_temp = st_thermal_get_temp, | |
180 | .get_trip_type = st_thermal_get_trip_type, | |
181 | .get_trip_temp = st_thermal_get_trip_temp, | |
182 | }; | |
183 | ||
184 | int st_thermal_register(struct platform_device *pdev, | |
185 | const struct of_device_id *st_thermal_of_match) | |
186 | { | |
187 | struct st_thermal_sensor *sensor; | |
188 | struct device *dev = &pdev->dev; | |
189 | struct device_node *np = dev->of_node; | |
190 | const struct of_device_id *match; | |
191 | ||
192 | int polling_delay; | |
193 | int ret; | |
194 | ||
195 | if (!np) { | |
196 | dev_err(dev, "device tree node not found\n"); | |
197 | return -EINVAL; | |
198 | } | |
199 | ||
200 | sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); | |
201 | if (!sensor) | |
202 | return -ENOMEM; | |
203 | ||
204 | sensor->dev = dev; | |
205 | ||
206 | match = of_match_device(st_thermal_of_match, dev); | |
207 | if (!(match && match->data)) | |
208 | return -EINVAL; | |
209 | ||
210 | sensor->cdata = match->data; | |
211 | if (!sensor->cdata->ops) | |
212 | return -EINVAL; | |
213 | ||
214 | sensor->ops = sensor->cdata->ops; | |
215 | ||
331a5fc9 | 216 | ret = (sensor->ops->regmap_init)(sensor); |
60aef7ce LJ |
217 | if (ret) |
218 | return ret; | |
219 | ||
220 | ret = st_thermal_alloc_regfields(sensor); | |
221 | if (ret) | |
222 | return ret; | |
223 | ||
224 | sensor->clk = devm_clk_get(dev, "thermal"); | |
225 | if (IS_ERR(sensor->clk)) { | |
226 | dev_err(dev, "failed to fetch clock\n"); | |
227 | return PTR_ERR(sensor->clk); | |
228 | } | |
229 | ||
230 | if (sensor->ops->register_enable_irq) { | |
231 | ret = sensor->ops->register_enable_irq(sensor); | |
232 | if (ret) | |
233 | return ret; | |
234 | } | |
235 | ||
236 | ret = st_thermal_sensor_on(sensor); | |
237 | if (ret) | |
238 | return ret; | |
239 | ||
240 | ret = st_thermal_calibration(sensor); | |
241 | if (ret) | |
242 | goto sensor_off; | |
243 | ||
244 | polling_delay = sensor->ops->register_enable_irq ? 0 : 1000; | |
245 | ||
246 | sensor->thermal_dev = | |
247 | thermal_zone_device_register(dev_name(dev), 1, 0, sensor, | |
248 | &st_tz_ops, NULL, 0, polling_delay); | |
249 | if (IS_ERR(sensor->thermal_dev)) { | |
250 | dev_err(dev, "failed to register thermal zone device\n"); | |
251 | ret = PTR_ERR(sensor->thermal_dev); | |
252 | goto sensor_off; | |
253 | } | |
254 | ||
255 | platform_set_drvdata(pdev, sensor); | |
256 | ||
257 | return 0; | |
258 | ||
259 | sensor_off: | |
260 | st_thermal_sensor_off(sensor); | |
261 | ||
262 | return ret; | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(st_thermal_register); | |
265 | ||
266 | int st_thermal_unregister(struct platform_device *pdev) | |
267 | { | |
268 | struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
269 | ||
270 | st_thermal_sensor_off(sensor); | |
271 | thermal_zone_device_unregister(sensor->thermal_dev); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | EXPORT_SYMBOL_GPL(st_thermal_unregister); | |
276 | ||
e60a342b | 277 | #ifdef CONFIG_PM_SLEEP |
60aef7ce LJ |
278 | static int st_thermal_suspend(struct device *dev) |
279 | { | |
280 | struct platform_device *pdev = to_platform_device(dev); | |
281 | struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
282 | ||
283 | return st_thermal_sensor_off(sensor); | |
284 | } | |
285 | ||
286 | static int st_thermal_resume(struct device *dev) | |
287 | { | |
288 | int ret; | |
289 | struct platform_device *pdev = to_platform_device(dev); | |
290 | struct st_thermal_sensor *sensor = platform_get_drvdata(pdev); | |
291 | ||
292 | ret = st_thermal_sensor_on(sensor); | |
293 | if (ret) | |
294 | return ret; | |
295 | ||
296 | ret = st_thermal_calibration(sensor); | |
297 | if (ret) | |
298 | return ret; | |
299 | ||
300 | if (sensor->ops->enable_irq) { | |
301 | ret = sensor->ops->enable_irq(sensor); | |
302 | if (ret) | |
303 | return ret; | |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
e60a342b LJ |
308 | #endif |
309 | ||
60aef7ce LJ |
310 | SIMPLE_DEV_PM_OPS(st_thermal_pm_ops, st_thermal_suspend, st_thermal_resume); |
311 | EXPORT_SYMBOL_GPL(st_thermal_pm_ops); | |
312 | ||
313 | MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>"); | |
314 | MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver"); | |
315 | MODULE_LICENSE("GPL v2"); |