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![Lars-Peter Clausen](/assets/img/avatar_default.png)
Use DIV_ROUND_CLOSEST() instead of open-coding it. This makes it more clear what is going on for the casual reviewer. Generated using the following the Coccinelle semantic patch. // <smpl> @@ expression x, y; @@ -((x) + ((y) / 2)) / (y) +DIV_ROUND_CLOSEST(x, y) // </smpl> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Chunyan Zhang <zhang.lyra@gmail.com> Link: https://lore.kernel.org/r/20201222191618.3433-1-lars@metafoo.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
565 lines
15 KiB
C
565 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Spreadtrum Communications Inc.
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#include <linux/hwspinlock.h>
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#include <linux/iio/iio.h>
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#include <linux/module.h>
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#include <linux/nvmem-consumer.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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/* PMIC global registers definition */
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#define SC27XX_MODULE_EN 0xc08
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#define SC27XX_MODULE_ADC_EN BIT(5)
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#define SC27XX_ARM_CLK_EN 0xc10
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#define SC27XX_CLK_ADC_EN BIT(5)
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#define SC27XX_CLK_ADC_CLK_EN BIT(6)
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/* ADC controller registers definition */
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#define SC27XX_ADC_CTL 0x0
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#define SC27XX_ADC_CH_CFG 0x4
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#define SC27XX_ADC_DATA 0x4c
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#define SC27XX_ADC_INT_EN 0x50
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#define SC27XX_ADC_INT_CLR 0x54
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#define SC27XX_ADC_INT_STS 0x58
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#define SC27XX_ADC_INT_RAW 0x5c
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/* Bits and mask definition for SC27XX_ADC_CTL register */
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#define SC27XX_ADC_EN BIT(0)
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#define SC27XX_ADC_CHN_RUN BIT(1)
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#define SC27XX_ADC_12BIT_MODE BIT(2)
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#define SC27XX_ADC_RUN_NUM_MASK GENMASK(7, 4)
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#define SC27XX_ADC_RUN_NUM_SHIFT 4
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/* Bits and mask definition for SC27XX_ADC_CH_CFG register */
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#define SC27XX_ADC_CHN_ID_MASK GENMASK(4, 0)
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#define SC27XX_ADC_SCALE_MASK GENMASK(10, 8)
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#define SC27XX_ADC_SCALE_SHIFT 8
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/* Bits definitions for SC27XX_ADC_INT_EN registers */
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#define SC27XX_ADC_IRQ_EN BIT(0)
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/* Bits definitions for SC27XX_ADC_INT_CLR registers */
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#define SC27XX_ADC_IRQ_CLR BIT(0)
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/* Bits definitions for SC27XX_ADC_INT_RAW registers */
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#define SC27XX_ADC_IRQ_RAW BIT(0)
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/* Mask definition for SC27XX_ADC_DATA register */
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#define SC27XX_ADC_DATA_MASK GENMASK(11, 0)
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/* Timeout (ms) for the trylock of hardware spinlocks */
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#define SC27XX_ADC_HWLOCK_TIMEOUT 5000
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/* Timeout (us) for ADC data conversion according to ADC datasheet */
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#define SC27XX_ADC_RDY_TIMEOUT 1000000
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#define SC27XX_ADC_POLL_RAW_STATUS 500
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/* Maximum ADC channel number */
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#define SC27XX_ADC_CHANNEL_MAX 32
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/* ADC voltage ratio definition */
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#define SC27XX_VOLT_RATIO(n, d) \
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(((n) << SC27XX_RATIO_NUMERATOR_OFFSET) | (d))
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#define SC27XX_RATIO_NUMERATOR_OFFSET 16
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#define SC27XX_RATIO_DENOMINATOR_MASK GENMASK(15, 0)
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struct sc27xx_adc_data {
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struct device *dev;
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struct regmap *regmap;
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/*
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* One hardware spinlock to synchronize between the multiple
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* subsystems which will access the unique ADC controller.
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*/
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struct hwspinlock *hwlock;
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int channel_scale[SC27XX_ADC_CHANNEL_MAX];
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u32 base;
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int irq;
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};
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struct sc27xx_adc_linear_graph {
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int volt0;
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int adc0;
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int volt1;
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int adc1;
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};
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/*
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* According to the datasheet, we can convert one ADC value to one voltage value
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* through 2 points in the linear graph. If the voltage is less than 1.2v, we
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* should use the small-scale graph, and if more than 1.2v, we should use the
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* big-scale graph.
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*/
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static struct sc27xx_adc_linear_graph big_scale_graph = {
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4200, 3310,
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3600, 2832,
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};
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static struct sc27xx_adc_linear_graph small_scale_graph = {
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1000, 3413,
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100, 341,
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};
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static const struct sc27xx_adc_linear_graph big_scale_graph_calib = {
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4200, 856,
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3600, 733,
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};
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static const struct sc27xx_adc_linear_graph small_scale_graph_calib = {
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1000, 833,
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100, 80,
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};
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static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
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{
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return ((calib_data & 0xff) + calib_adc - 128) * 4;
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}
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static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
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bool big_scale)
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{
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const struct sc27xx_adc_linear_graph *calib_graph;
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struct sc27xx_adc_linear_graph *graph;
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struct nvmem_cell *cell;
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const char *cell_name;
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u32 calib_data = 0;
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void *buf;
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size_t len;
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if (big_scale) {
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calib_graph = &big_scale_graph_calib;
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graph = &big_scale_graph;
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cell_name = "big_scale_calib";
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} else {
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calib_graph = &small_scale_graph_calib;
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graph = &small_scale_graph;
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cell_name = "small_scale_calib";
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}
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cell = nvmem_cell_get(data->dev, cell_name);
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if (IS_ERR(cell))
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return PTR_ERR(cell);
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buf = nvmem_cell_read(cell, &len);
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nvmem_cell_put(cell);
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if (IS_ERR(buf))
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return PTR_ERR(buf);
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memcpy(&calib_data, buf, min(len, sizeof(u32)));
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/* Only need to calibrate the adc values in the linear graph. */
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graph->adc0 = sc27xx_adc_get_calib_data(calib_data, calib_graph->adc0);
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graph->adc1 = sc27xx_adc_get_calib_data(calib_data >> 8,
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calib_graph->adc1);
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kfree(buf);
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return 0;
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}
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static int sc27xx_adc_get_ratio(int channel, int scale)
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{
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switch (channel) {
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case 1:
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case 2:
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case 3:
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case 4:
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return scale ? SC27XX_VOLT_RATIO(400, 1025) :
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SC27XX_VOLT_RATIO(1, 1);
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case 5:
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return SC27XX_VOLT_RATIO(7, 29);
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case 6:
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return SC27XX_VOLT_RATIO(375, 9000);
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case 7:
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case 8:
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return scale ? SC27XX_VOLT_RATIO(100, 125) :
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SC27XX_VOLT_RATIO(1, 1);
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case 19:
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return SC27XX_VOLT_RATIO(1, 3);
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default:
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return SC27XX_VOLT_RATIO(1, 1);
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}
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return SC27XX_VOLT_RATIO(1, 1);
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}
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static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
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int scale, int *val)
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{
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int ret;
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u32 tmp, value, status;
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ret = hwspin_lock_timeout_raw(data->hwlock, SC27XX_ADC_HWLOCK_TIMEOUT);
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if (ret) {
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dev_err(data->dev, "timeout to get the hwspinlock\n");
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return ret;
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}
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ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
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SC27XX_ADC_EN, SC27XX_ADC_EN);
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if (ret)
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goto unlock_adc;
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ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_INT_CLR,
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SC27XX_ADC_IRQ_CLR, SC27XX_ADC_IRQ_CLR);
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if (ret)
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goto disable_adc;
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/* Configure the channel id and scale */
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tmp = (scale << SC27XX_ADC_SCALE_SHIFT) & SC27XX_ADC_SCALE_MASK;
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tmp |= channel & SC27XX_ADC_CHN_ID_MASK;
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ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CH_CFG,
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SC27XX_ADC_CHN_ID_MASK | SC27XX_ADC_SCALE_MASK,
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tmp);
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if (ret)
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goto disable_adc;
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/* Select 12bit conversion mode, and only sample 1 time */
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tmp = SC27XX_ADC_12BIT_MODE;
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tmp |= (0 << SC27XX_ADC_RUN_NUM_SHIFT) & SC27XX_ADC_RUN_NUM_MASK;
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ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
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SC27XX_ADC_RUN_NUM_MASK | SC27XX_ADC_12BIT_MODE,
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tmp);
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if (ret)
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goto disable_adc;
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ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
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SC27XX_ADC_CHN_RUN, SC27XX_ADC_CHN_RUN);
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if (ret)
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goto disable_adc;
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ret = regmap_read_poll_timeout(data->regmap,
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data->base + SC27XX_ADC_INT_RAW,
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status, (status & SC27XX_ADC_IRQ_RAW),
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SC27XX_ADC_POLL_RAW_STATUS,
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SC27XX_ADC_RDY_TIMEOUT);
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if (ret) {
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dev_err(data->dev, "read adc timeout, status = 0x%x\n", status);
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goto disable_adc;
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}
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ret = regmap_read(data->regmap, data->base + SC27XX_ADC_DATA, &value);
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if (ret)
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goto disable_adc;
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value &= SC27XX_ADC_DATA_MASK;
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disable_adc:
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regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
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SC27XX_ADC_EN, 0);
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unlock_adc:
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hwspin_unlock_raw(data->hwlock);
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if (!ret)
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*val = value;
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return ret;
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}
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static void sc27xx_adc_volt_ratio(struct sc27xx_adc_data *data,
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int channel, int scale,
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u32 *div_numerator, u32 *div_denominator)
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{
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u32 ratio = sc27xx_adc_get_ratio(channel, scale);
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*div_numerator = ratio >> SC27XX_RATIO_NUMERATOR_OFFSET;
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*div_denominator = ratio & SC27XX_RATIO_DENOMINATOR_MASK;
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}
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static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
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int raw_adc)
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{
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int tmp;
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tmp = (graph->volt0 - graph->volt1) * (raw_adc - graph->adc1);
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tmp /= (graph->adc0 - graph->adc1);
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tmp += graph->volt1;
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return tmp < 0 ? 0 : tmp;
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}
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static int sc27xx_adc_convert_volt(struct sc27xx_adc_data *data, int channel,
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int scale, int raw_adc)
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{
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u32 numerator, denominator;
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u32 volt;
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/*
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* Convert ADC values to voltage values according to the linear graph,
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* and channel 5 and channel 1 has been calibrated, so we can just
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* return the voltage values calculated by the linear graph. But other
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* channels need be calculated to the real voltage values with the
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* voltage ratio.
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*/
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switch (channel) {
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case 5:
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return sc27xx_adc_to_volt(&big_scale_graph, raw_adc);
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case 1:
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return sc27xx_adc_to_volt(&small_scale_graph, raw_adc);
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default:
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volt = sc27xx_adc_to_volt(&small_scale_graph, raw_adc);
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break;
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}
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sc27xx_adc_volt_ratio(data, channel, scale, &numerator, &denominator);
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return DIV_ROUND_CLOSEST(volt * denominator, numerator);
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}
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static int sc27xx_adc_read_processed(struct sc27xx_adc_data *data,
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int channel, int scale, int *val)
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{
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int ret, raw_adc;
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ret = sc27xx_adc_read(data, channel, scale, &raw_adc);
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if (ret)
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return ret;
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*val = sc27xx_adc_convert_volt(data, channel, scale, raw_adc);
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return 0;
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}
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static int sc27xx_adc_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct sc27xx_adc_data *data = iio_priv(indio_dev);
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int scale = data->channel_scale[chan->channel];
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int ret, tmp;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&indio_dev->mlock);
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ret = sc27xx_adc_read(data, chan->channel, scale, &tmp);
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mutex_unlock(&indio_dev->mlock);
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if (ret)
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return ret;
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*val = tmp;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_PROCESSED:
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mutex_lock(&indio_dev->mlock);
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ret = sc27xx_adc_read_processed(data, chan->channel, scale,
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&tmp);
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mutex_unlock(&indio_dev->mlock);
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if (ret)
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return ret;
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*val = tmp;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = scale;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static int sc27xx_adc_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct sc27xx_adc_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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data->channel_scale[chan->channel] = val;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info sc27xx_info = {
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.read_raw = &sc27xx_adc_read_raw,
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.write_raw = &sc27xx_adc_write_raw,
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};
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#define SC27XX_ADC_CHANNEL(index, mask) { \
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.type = IIO_VOLTAGE, \
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.channel = index, \
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.info_mask_separate = mask | BIT(IIO_CHAN_INFO_SCALE), \
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.datasheet_name = "CH##index", \
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.indexed = 1, \
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}
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static const struct iio_chan_spec sc27xx_channels[] = {
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SC27XX_ADC_CHANNEL(0, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(1, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(2, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(3, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(4, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(5, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(6, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(7, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(8, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(9, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(10, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(11, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(12, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(13, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(14, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(15, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(16, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(17, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(18, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(19, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(20, BIT(IIO_CHAN_INFO_RAW)),
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SC27XX_ADC_CHANNEL(21, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(22, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(23, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(24, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(25, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(26, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(27, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(28, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(29, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(30, BIT(IIO_CHAN_INFO_PROCESSED)),
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SC27XX_ADC_CHANNEL(31, BIT(IIO_CHAN_INFO_PROCESSED)),
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};
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static int sc27xx_adc_enable(struct sc27xx_adc_data *data)
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{
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int ret;
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ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN,
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SC27XX_MODULE_ADC_EN, SC27XX_MODULE_ADC_EN);
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if (ret)
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return ret;
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/* Enable ADC work clock and controller clock */
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ret = regmap_update_bits(data->regmap, SC27XX_ARM_CLK_EN,
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SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN,
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SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN);
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if (ret)
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goto disable_adc;
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/* ADC channel scales' calibration from nvmem device */
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ret = sc27xx_adc_scale_calibration(data, true);
|
|
if (ret)
|
|
goto disable_clk;
|
|
|
|
ret = sc27xx_adc_scale_calibration(data, false);
|
|
if (ret)
|
|
goto disable_clk;
|
|
|
|
return 0;
|
|
|
|
disable_clk:
|
|
regmap_update_bits(data->regmap, SC27XX_ARM_CLK_EN,
|
|
SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN, 0);
|
|
disable_adc:
|
|
regmap_update_bits(data->regmap, SC27XX_MODULE_EN,
|
|
SC27XX_MODULE_ADC_EN, 0);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sc27xx_adc_disable(void *_data)
|
|
{
|
|
struct sc27xx_adc_data *data = _data;
|
|
|
|
/* Disable ADC work clock and controller clock */
|
|
regmap_update_bits(data->regmap, SC27XX_ARM_CLK_EN,
|
|
SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN, 0);
|
|
|
|
regmap_update_bits(data->regmap, SC27XX_MODULE_EN,
|
|
SC27XX_MODULE_ADC_EN, 0);
|
|
}
|
|
|
|
static int sc27xx_adc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = dev->of_node;
|
|
struct sc27xx_adc_data *sc27xx_data;
|
|
struct iio_dev *indio_dev;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*sc27xx_data));
|
|
if (!indio_dev)
|
|
return -ENOMEM;
|
|
|
|
sc27xx_data = iio_priv(indio_dev);
|
|
|
|
sc27xx_data->regmap = dev_get_regmap(dev->parent, NULL);
|
|
if (!sc27xx_data->regmap) {
|
|
dev_err(dev, "failed to get ADC regmap\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "reg", &sc27xx_data->base);
|
|
if (ret) {
|
|
dev_err(dev, "failed to get ADC base address\n");
|
|
return ret;
|
|
}
|
|
|
|
sc27xx_data->irq = platform_get_irq(pdev, 0);
|
|
if (sc27xx_data->irq < 0)
|
|
return sc27xx_data->irq;
|
|
|
|
ret = of_hwspin_lock_get_id(np, 0);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to get hwspinlock id\n");
|
|
return ret;
|
|
}
|
|
|
|
sc27xx_data->hwlock = devm_hwspin_lock_request_specific(dev, ret);
|
|
if (!sc27xx_data->hwlock) {
|
|
dev_err(dev, "failed to request hwspinlock\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
sc27xx_data->dev = dev;
|
|
|
|
ret = sc27xx_adc_enable(sc27xx_data);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable ADC module\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_add_action_or_reset(dev, sc27xx_adc_disable, sc27xx_data);
|
|
if (ret) {
|
|
dev_err(dev, "failed to add ADC disable action\n");
|
|
return ret;
|
|
}
|
|
|
|
indio_dev->name = dev_name(dev);
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->info = &sc27xx_info;
|
|
indio_dev->channels = sc27xx_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(sc27xx_channels);
|
|
ret = devm_iio_device_register(dev, indio_dev);
|
|
if (ret)
|
|
dev_err(dev, "could not register iio (ADC)");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id sc27xx_adc_of_match[] = {
|
|
{ .compatible = "sprd,sc2731-adc", },
|
|
{ }
|
|
};
|
|
|
|
static struct platform_driver sc27xx_adc_driver = {
|
|
.probe = sc27xx_adc_probe,
|
|
.driver = {
|
|
.name = "sc27xx-adc",
|
|
.of_match_table = sc27xx_adc_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(sc27xx_adc_driver);
|
|
|
|
MODULE_AUTHOR("Freeman Liu <freeman.liu@spreadtrum.com>");
|
|
MODULE_DESCRIPTION("Spreadtrum SC27XX ADC Driver");
|
|
MODULE_LICENSE("GPL v2");
|