2019-06-04 02:11:33 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2016-04-19 01:22:01 -06:00
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/*
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* Generic ADC thermal driver
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*
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* Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
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*
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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*/
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#include <linux/iio/consumer.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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struct gadc_thermal_info {
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struct device *dev;
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struct thermal_zone_device *tz_dev;
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struct iio_channel *channel;
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s32 *lookup_table;
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int nlookup_table;
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};
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static int gadc_thermal_adc_to_temp(struct gadc_thermal_info *gti, int val)
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{
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2018-12-24 00:26:44 -07:00
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int temp, temp_hi, temp_lo, adc_hi, adc_lo;
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2016-04-19 01:22:01 -06:00
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int i;
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2019-04-18 10:37:32 -06:00
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if (!gti->lookup_table)
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return val;
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2016-04-19 01:22:01 -06:00
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for (i = 0; i < gti->nlookup_table; i++) {
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if (val >= gti->lookup_table[2 * i + 1])
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break;
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}
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if (i == 0) {
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temp = gti->lookup_table[0];
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2018-12-24 00:26:44 -07:00
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} else if (i >= gti->nlookup_table) {
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2016-04-19 01:22:01 -06:00
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temp = gti->lookup_table[2 * (gti->nlookup_table - 1)];
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} else {
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adc_hi = gti->lookup_table[2 * i - 1];
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adc_lo = gti->lookup_table[2 * i + 1];
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2018-12-24 00:26:44 -07:00
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temp_hi = gti->lookup_table[2 * i - 2];
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temp_lo = gti->lookup_table[2 * i];
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temp = temp_hi + mult_frac(temp_lo - temp_hi, val - adc_hi,
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adc_lo - adc_hi);
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2016-04-19 01:22:01 -06:00
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}
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return temp;
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}
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static int gadc_thermal_get_temp(void *data, int *temp)
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{
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struct gadc_thermal_info *gti = data;
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int val;
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int ret;
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ret = iio_read_channel_processed(gti->channel, &val);
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if (ret < 0) {
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dev_err(gti->dev, "IIO channel read failed %d\n", ret);
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return ret;
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}
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*temp = gadc_thermal_adc_to_temp(gti, val);
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return 0;
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}
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static const struct thermal_zone_of_device_ops gadc_thermal_ops = {
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.get_temp = gadc_thermal_get_temp,
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};
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static int gadc_thermal_read_linear_lookup_table(struct device *dev,
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struct gadc_thermal_info *gti)
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{
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struct device_node *np = dev->of_node;
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int ntable;
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int ret;
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ntable = of_property_count_elems_of_size(np, "temperature-lookup-table",
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sizeof(u32));
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2019-04-18 10:37:32 -06:00
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if (ntable <= 0) {
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dev_notice(dev, "no lookup table, assuming DAC channel returns milliCelcius\n");
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return 0;
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2016-04-19 01:22:01 -06:00
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}
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if (ntable % 2) {
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dev_err(dev, "Pair of temperature vs ADC read value missing\n");
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return -EINVAL;
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}
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treewide: devm_kzalloc() -> devm_kcalloc()
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:
devm_kzalloc(handle, a * b, gfp)
with:
devm_kcalloc(handle, a * b, gfp)
as well as handling cases of:
devm_kzalloc(handle, a * b * c, gfp)
with:
devm_kzalloc(handle, array3_size(a, b, c), gfp)
as it's slightly less ugly than:
devm_kcalloc(handle, array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
devm_kzalloc(handle, 4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@
(
devm_kzalloc(HANDLE,
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
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devm_kzalloc(HANDLE,
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@
(
devm_kzalloc(HANDLE,
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(u8) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(char) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
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devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@
(
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
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devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
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devm_kzalloc(HANDLE,
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
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devm_kzalloc(HANDLE,
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
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devm_kzalloc(HANDLE,
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
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devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
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devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
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devm_kzalloc(HANDLE, C1 * C2, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * E2
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * (E2)
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 15:07:58 -06:00
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gti->lookup_table = devm_kcalloc(dev,
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ntable, sizeof(*gti->lookup_table),
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GFP_KERNEL);
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2016-04-19 01:22:01 -06:00
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if (!gti->lookup_table)
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return -ENOMEM;
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ret = of_property_read_u32_array(np, "temperature-lookup-table",
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(u32 *)gti->lookup_table, ntable);
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if (ret < 0) {
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dev_err(dev, "Failed to read temperature lookup table: %d\n",
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ret);
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return ret;
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}
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gti->nlookup_table = ntable / 2;
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return 0;
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}
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static int gadc_thermal_probe(struct platform_device *pdev)
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{
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struct gadc_thermal_info *gti;
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int ret;
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if (!pdev->dev.of_node) {
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dev_err(&pdev->dev, "Only DT based supported\n");
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return -ENODEV;
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}
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gti = devm_kzalloc(&pdev->dev, sizeof(*gti), GFP_KERNEL);
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if (!gti)
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return -ENOMEM;
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ret = gadc_thermal_read_linear_lookup_table(&pdev->dev, gti);
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if (ret < 0)
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return ret;
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gti->dev = &pdev->dev;
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platform_set_drvdata(pdev, gti);
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2017-10-19 11:05:59 -06:00
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gti->channel = devm_iio_channel_get(&pdev->dev, "sensor-channel");
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2016-04-19 01:22:01 -06:00
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if (IS_ERR(gti->channel)) {
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ret = PTR_ERR(gti->channel);
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2019-09-10 01:59:07 -06:00
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev, "IIO channel not found: %d\n", ret);
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2016-04-19 01:22:01 -06:00
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return ret;
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}
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2017-10-19 11:05:59 -06:00
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gti->tz_dev = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, gti,
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&gadc_thermal_ops);
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2016-04-19 01:22:01 -06:00
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if (IS_ERR(gti->tz_dev)) {
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ret = PTR_ERR(gti->tz_dev);
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2019-09-10 01:59:07 -06:00
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if (ret != -EPROBE_DEFER)
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dev_err(&pdev->dev,
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"Thermal zone sensor register failed: %d\n",
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ret);
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2017-10-19 11:05:59 -06:00
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return ret;
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2016-04-19 01:22:01 -06:00
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}
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return 0;
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}
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static const struct of_device_id of_adc_thermal_match[] = {
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{ .compatible = "generic-adc-thermal", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_adc_thermal_match);
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static struct platform_driver gadc_thermal_driver = {
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.driver = {
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.name = "generic-adc-thermal",
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.of_match_table = of_adc_thermal_match,
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},
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.probe = gadc_thermal_probe,
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};
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module_platform_driver(gadc_thermal_driver);
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MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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MODULE_DESCRIPTION("Generic ADC thermal driver using IIO framework with DT");
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MODULE_LICENSE("GPL v2");
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