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linux/drivers/thermal/k3_bandgap.c
Daniel Lezcano 4a16c190f7 thermal/hwmon: Use the right device for devm_thermal_add_hwmon_sysfs() 
The devres variant of thermal_add_hwmon_sysfs() only takes the thermal
zone structure pointer as parameter.

Actually, it uses the tz->device to add it in the devres list.

It is preferable to use the device registering the thermal zone
instead of the thermal zone device itself. That prevents the driver
accessing the thermal zone structure internals and it is from my POV
more correct regarding how devm_ is used.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> #amlogic_thermal
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com> #sun8i_thermal
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> #MediaTek auxadc
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2023-03-03 20:45:02 +01:00

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8.3 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* TI Bandgap temperature sensor driver for K3 SoC Family
*
* Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/thermal.h>
#include <linux/types.h>
#include "thermal_hwmon.h"
#define K3_VTM_DEVINFO_PWR0_OFFSET 0x4
#define K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK 0xf0
#define K3_VTM_TMPSENS0_CTRL_OFFSET 0x80
#define K3_VTM_REGS_PER_TS 0x10
#define K3_VTM_TS_STAT_DTEMP_MASK 0x3ff
#define K3_VTM_TMPSENS_CTRL_CBIASSEL BIT(0)
#define K3_VTM_TMPSENS_CTRL_SOC BIT(5)
#define K3_VTM_TMPSENS_CTRL_CLRZ BIT(6)
#define K3_VTM_TMPSENS_CTRL_CLKON_REQ BIT(7)
#define K3_VTM_ADC_BEGIN_VAL 540
#define K3_VTM_ADC_END_VAL 944
static const int k3_adc_to_temp[] = {
-40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200,
-37800, -37400, -37000, -36600, -36200, -35800, -35300, -34700, -34200,
-33800, -33400, -33000, -32600, -32200, -31800, -31400, -31000, -30600,
-30200, -29800, -29400, -29000, -28600, -28200, -27700, -27100, -26600,
-26200, -25800, -25400, -25000, -24600, -24200, -23800, -23400, -23000,
-22600, -22200, -21800, -21400, -21000, -20500, -19900, -19400, -19000,
-18600, -18200, -17800, -17400, -17000, -16600, -16200, -15800, -15400,
-15000, -14600, -14200, -13800, -13400, -13000, -12500, -11900, -11400,
-11000, -10600, -10200, -9800, -9400, -9000, -8600, -8200, -7800, -7400,
-7000, -6600, -6200, -5800, -5400, -5000, -4500, -3900, -3400, -3000,
-2600, -2200, -1800, -1400, -1000, -600, -200, 200, 600, 1000, 1400,
1800, 2200, 2600, 3000, 3400, 3900, 4500, 5000, 5400, 5800, 6200, 6600,
7000, 7400, 7800, 8200, 8600, 9000, 9400, 9800, 10200, 10600, 11000,
11400, 11800, 12200, 12700, 13300, 13800, 14200, 14600, 15000, 15400,
15800, 16200, 16600, 17000, 17400, 17800, 18200, 18600, 19000, 19400,
19800, 20200, 20600, 21000, 21400, 21900, 22500, 23000, 23400, 23800,
24200, 24600, 25000, 25400, 25800, 26200, 26600, 27000, 27400, 27800,
28200, 28600, 29000, 29400, 29800, 30200, 30600, 31000, 31400, 31900,
32500, 33000, 33400, 33800, 34200, 34600, 35000, 35400, 35800, 36200,
36600, 37000, 37400, 37800, 38200, 38600, 39000, 39400, 39800, 40200,
40600, 41000, 41400, 41800, 42200, 42600, 43100, 43700, 44200, 44600,
45000, 45400, 45800, 46200, 46600, 47000, 47400, 47800, 48200, 48600,
49000, 49400, 49800, 50200, 50600, 51000, 51400, 51800, 52200, 52600,
53000, 53400, 53800, 54200, 54600, 55000, 55400, 55900, 56500, 57000,
57400, 57800, 58200, 58600, 59000, 59400, 59800, 60200, 60600, 61000,
61400, 61800, 62200, 62600, 63000, 63400, 63800, 64200, 64600, 65000,
65400, 65800, 66200, 66600, 67000, 67400, 67800, 68200, 68600, 69000,
69400, 69800, 70200, 70600, 71000, 71500, 72100, 72600, 73000, 73400,
73800, 74200, 74600, 75000, 75400, 75800, 76200, 76600, 77000, 77400,
77800, 78200, 78600, 79000, 79400, 79800, 80200, 80600, 81000, 81400,
81800, 82200, 82600, 83000, 83400, 83800, 84200, 84600, 85000, 85400,
85800, 86200, 86600, 87000, 87400, 87800, 88200, 88600, 89000, 89400,
89800, 90200, 90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400,
93800, 94200, 94600, 95000, 95400, 95800, 96200, 96600, 97000, 97500,
98100, 98600, 99000, 99400, 99800, 100200, 100600, 101000, 101400,
101800, 102200, 102600, 103000, 103400, 103800, 104200, 104600, 105000,
105400, 105800, 106200, 106600, 107000, 107400, 107800, 108200, 108600,
109000, 109400, 109800, 110200, 110600, 111000, 111400, 111800, 112200,
112600, 113000, 113400, 113800, 114200, 114600, 115000, 115400, 115800,
116200, 116600, 117000, 117400, 117800, 118200, 118600, 119000, 119400,
119800, 120200, 120600, 121000, 121400, 121800, 122200, 122600, 123000,
123400, 123800, 124200, 124600, 124900, 125000,
};
struct k3_bandgap {
void __iomem *base;
const struct k3_bandgap_data *conf;
};
/* common data structures */
struct k3_thermal_data {
struct thermal_zone_device *tzd;
struct k3_bandgap *bgp;
int sensor_id;
u32 ctrl_offset;
u32 stat_offset;
};
static unsigned int vtm_get_best_value(unsigned int s0, unsigned int s1,
unsigned int s2)
{
int d01 = abs(s0 - s1);
int d02 = abs(s0 - s2);
int d12 = abs(s1 - s2);
if (d01 <= d02 && d01 <= d12)
return (s0 + s1) / 2;
if (d02 <= d01 && d02 <= d12)
return (s0 + s2) / 2;
return (s1 + s2) / 2;
}
static int k3_bgp_read_temp(struct k3_thermal_data *devdata,
int *temp)
{
struct k3_bandgap *bgp;
unsigned int dtemp, s0, s1, s2;
bgp = devdata->bgp;
/*
* Errata is applicable for am654 pg 1.0 silicon. There
* is a variation of the order for 8-10 degree centigrade.
* Work around that by getting the average of two closest
* readings out of three readings everytime we want to
* report temperatures.
*
* Errata workaround.
*/
s0 = readl(bgp->base + devdata->stat_offset) &
K3_VTM_TS_STAT_DTEMP_MASK;
s1 = readl(bgp->base + devdata->stat_offset) &
K3_VTM_TS_STAT_DTEMP_MASK;
s2 = readl(bgp->base + devdata->stat_offset) &
K3_VTM_TS_STAT_DTEMP_MASK;
dtemp = vtm_get_best_value(s0, s1, s2);
if (dtemp < K3_VTM_ADC_BEGIN_VAL || dtemp > K3_VTM_ADC_END_VAL)
return -EINVAL;
*temp = k3_adc_to_temp[dtemp - K3_VTM_ADC_BEGIN_VAL];
return 0;
}
static int k3_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
struct k3_thermal_data *data = thermal_zone_device_priv(tz);
int ret = 0;
ret = k3_bgp_read_temp(data, temp);
if (ret)
return ret;
return ret;
}
static const struct thermal_zone_device_ops k3_of_thermal_ops = {
.get_temp = k3_thermal_get_temp,
};
static const struct of_device_id of_k3_bandgap_match[];
static int k3_bandgap_probe(struct platform_device *pdev)
{
int ret = 0, cnt, val, id;
struct resource *res;
struct device *dev = &pdev->dev;
struct k3_bandgap *bgp;
struct k3_thermal_data *data;
if (ARRAY_SIZE(k3_adc_to_temp) != (K3_VTM_ADC_END_VAL + 1 -
K3_VTM_ADC_BEGIN_VAL))
return -EINVAL;
bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);
if (!bgp)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
bgp->base = devm_ioremap_resource(dev, res);
if (IS_ERR(bgp->base))
return PTR_ERR(bgp->base);
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
return ret;
}
/* Get the sensor count in the VTM */
val = readl(bgp->base + K3_VTM_DEVINFO_PWR0_OFFSET);
cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK;
cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK);
data = devm_kcalloc(dev, cnt, sizeof(*data), GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto err_alloc;
}
/* Register the thermal sensors */
for (id = 0; id < cnt; id++) {
data[id].sensor_id = id;
data[id].bgp = bgp;
data[id].ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET +
id * K3_VTM_REGS_PER_TS;
data[id].stat_offset = data[id].ctrl_offset + 0x8;
val = readl(data[id].bgp->base + data[id].ctrl_offset);
val |= (K3_VTM_TMPSENS_CTRL_SOC |
K3_VTM_TMPSENS_CTRL_CLRZ |
K3_VTM_TMPSENS_CTRL_CLKON_REQ);
val &= ~K3_VTM_TMPSENS_CTRL_CBIASSEL;
writel(val, data[id].bgp->base + data[id].ctrl_offset);
data[id].tzd =
devm_thermal_of_zone_register(dev, id,
&data[id],
&k3_of_thermal_ops);
if (IS_ERR(data[id].tzd)) {
dev_err(dev, "thermal zone device is NULL\n");
ret = PTR_ERR(data[id].tzd);
goto err_alloc;
}
if (devm_thermal_add_hwmon_sysfs(dev, data[id].tzd))
dev_warn(dev, "Failed to add hwmon sysfs attributes\n");
}
platform_set_drvdata(pdev, bgp);
return 0;
err_alloc:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
return ret;
}
static int k3_bandgap_remove(struct platform_device *pdev)
{
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return 0;
}
static const struct of_device_id of_k3_bandgap_match[] = {
{
.compatible = "ti,am654-vtm",
},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, of_k3_bandgap_match);
static struct platform_driver k3_bandgap_sensor_driver = {
.probe = k3_bandgap_probe,
.remove = k3_bandgap_remove,
.driver = {
.name = "k3-soc-thermal",
.of_match_table = of_k3_bandgap_match,
},
};
module_platform_driver(k3_bandgap_sensor_driver);
MODULE_DESCRIPTION("K3 bandgap temperature sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
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