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-rw-r--r--drivers/iio/adc/ingenic-adc.c923
1 files changed, 923 insertions, 0 deletions
diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
new file mode 100644
index 0000000000..a7325dbbb9
--- /dev/null
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -0,0 +1,923 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ADC driver for the Ingenic JZ47xx SoCs
+ * Copyright (c) 2019 Artur Rojek <contact@artur-rojek.eu>
+ *
+ * based on drivers/mfd/jz4740-adc.c
+ */
+
+#include <dt-bindings/iio/adc/ingenic,adc.h>
+#include <linux/clk.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#define JZ_ADC_REG_ENABLE 0x00
+#define JZ_ADC_REG_CFG 0x04
+#define JZ_ADC_REG_CTRL 0x08
+#define JZ_ADC_REG_STATUS 0x0c
+#define JZ_ADC_REG_ADSAME 0x10
+#define JZ_ADC_REG_ADWAIT 0x14
+#define JZ_ADC_REG_ADTCH 0x18
+#define JZ_ADC_REG_ADBDAT 0x1c
+#define JZ_ADC_REG_ADSDAT 0x20
+#define JZ_ADC_REG_ADCMD 0x24
+#define JZ_ADC_REG_ADCLK 0x28
+
+#define JZ_ADC_REG_ENABLE_PD BIT(7)
+#define JZ_ADC_REG_CFG_AUX_MD (BIT(0) | BIT(1))
+#define JZ_ADC_REG_CFG_BAT_MD BIT(4)
+#define JZ_ADC_REG_CFG_SAMPLE_NUM(n) ((n) << 10)
+#define JZ_ADC_REG_CFG_PULL_UP(n) ((n) << 16)
+#define JZ_ADC_REG_CFG_CMD_SEL BIT(22)
+#define JZ_ADC_REG_CFG_VBAT_SEL BIT(30)
+#define JZ_ADC_REG_CFG_TOUCH_OPS_MASK (BIT(31) | GENMASK(23, 10))
+#define JZ_ADC_REG_ADCLK_CLKDIV_LSB 0
+#define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB 16
+#define JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB 8
+#define JZ4770_ADC_REG_ADCLK_CLKDIVMS_LSB 16
+
+#define JZ_ADC_REG_ADCMD_YNADC BIT(7)
+#define JZ_ADC_REG_ADCMD_YPADC BIT(8)
+#define JZ_ADC_REG_ADCMD_XNADC BIT(9)
+#define JZ_ADC_REG_ADCMD_XPADC BIT(10)
+#define JZ_ADC_REG_ADCMD_VREFPYP BIT(11)
+#define JZ_ADC_REG_ADCMD_VREFPXP BIT(12)
+#define JZ_ADC_REG_ADCMD_VREFPXN BIT(13)
+#define JZ_ADC_REG_ADCMD_VREFPAUX BIT(14)
+#define JZ_ADC_REG_ADCMD_VREFPVDD33 BIT(15)
+#define JZ_ADC_REG_ADCMD_VREFNYN BIT(16)
+#define JZ_ADC_REG_ADCMD_VREFNXP BIT(17)
+#define JZ_ADC_REG_ADCMD_VREFNXN BIT(18)
+#define JZ_ADC_REG_ADCMD_VREFAUX BIT(19)
+#define JZ_ADC_REG_ADCMD_YNGRU BIT(20)
+#define JZ_ADC_REG_ADCMD_XNGRU BIT(21)
+#define JZ_ADC_REG_ADCMD_XPGRU BIT(22)
+#define JZ_ADC_REG_ADCMD_YPSUP BIT(23)
+#define JZ_ADC_REG_ADCMD_XNSUP BIT(24)
+#define JZ_ADC_REG_ADCMD_XPSUP BIT(25)
+
+#define JZ_ADC_AUX_VREF 3300
+#define JZ_ADC_AUX_VREF_BITS 12
+#define JZ_ADC_BATTERY_LOW_VREF 2500
+#define JZ_ADC_BATTERY_LOW_VREF_BITS 12
+#define JZ4725B_ADC_BATTERY_HIGH_VREF 7500
+#define JZ4725B_ADC_BATTERY_HIGH_VREF_BITS 10
+#define JZ4740_ADC_BATTERY_HIGH_VREF (7500 * 0.986)
+#define JZ4740_ADC_BATTERY_HIGH_VREF_BITS 12
+#define JZ4760_ADC_BATTERY_VREF 2500
+#define JZ4770_ADC_BATTERY_VREF 1200
+#define JZ4770_ADC_BATTERY_VREF_BITS 12
+
+#define JZ_ADC_IRQ_AUX BIT(0)
+#define JZ_ADC_IRQ_BATTERY BIT(1)
+#define JZ_ADC_IRQ_TOUCH BIT(2)
+#define JZ_ADC_IRQ_PEN_DOWN BIT(3)
+#define JZ_ADC_IRQ_PEN_UP BIT(4)
+#define JZ_ADC_IRQ_PEN_DOWN_SLEEP BIT(5)
+#define JZ_ADC_IRQ_SLEEP BIT(7)
+
+struct ingenic_adc;
+
+struct ingenic_adc_soc_data {
+ unsigned int battery_high_vref;
+ unsigned int battery_high_vref_bits;
+ const int *battery_raw_avail;
+ size_t battery_raw_avail_size;
+ const int *battery_scale_avail;
+ size_t battery_scale_avail_size;
+ unsigned int battery_vref_mode: 1;
+ unsigned int has_aux_md: 1;
+ const struct iio_chan_spec *channels;
+ unsigned int num_channels;
+ int (*init_clk_div)(struct device *dev, struct ingenic_adc *adc);
+};
+
+struct ingenic_adc {
+ void __iomem *base;
+ struct clk *clk;
+ struct mutex lock;
+ struct mutex aux_lock;
+ const struct ingenic_adc_soc_data *soc_data;
+ bool low_vref_mode;
+};
+
+static void ingenic_adc_set_adcmd(struct iio_dev *iio_dev, unsigned long mask)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+
+ mutex_lock(&adc->lock);
+
+ /* Init ADCMD */
+ readl(adc->base + JZ_ADC_REG_ADCMD);
+
+ if (mask & 0x3) {
+ /* Second channel (INGENIC_ADC_TOUCH_YP): sample YP vs. GND */
+ writel(JZ_ADC_REG_ADCMD_XNGRU
+ | JZ_ADC_REG_ADCMD_VREFNXN | JZ_ADC_REG_ADCMD_VREFPVDD33
+ | JZ_ADC_REG_ADCMD_YPADC,
+ adc->base + JZ_ADC_REG_ADCMD);
+
+ /* First channel (INGENIC_ADC_TOUCH_XP): sample XP vs. GND */
+ writel(JZ_ADC_REG_ADCMD_YNGRU
+ | JZ_ADC_REG_ADCMD_VREFNYN | JZ_ADC_REG_ADCMD_VREFPVDD33
+ | JZ_ADC_REG_ADCMD_XPADC,
+ adc->base + JZ_ADC_REG_ADCMD);
+ }
+
+ if (mask & 0xc) {
+ /* Fourth channel (INGENIC_ADC_TOUCH_YN): sample YN vs. GND */
+ writel(JZ_ADC_REG_ADCMD_XNGRU
+ | JZ_ADC_REG_ADCMD_VREFNXN | JZ_ADC_REG_ADCMD_VREFPVDD33
+ | JZ_ADC_REG_ADCMD_YNADC,
+ adc->base + JZ_ADC_REG_ADCMD);
+
+ /* Third channel (INGENIC_ADC_TOUCH_XN): sample XN vs. GND */
+ writel(JZ_ADC_REG_ADCMD_YNGRU
+ | JZ_ADC_REG_ADCMD_VREFNYN | JZ_ADC_REG_ADCMD_VREFPVDD33
+ | JZ_ADC_REG_ADCMD_XNADC,
+ adc->base + JZ_ADC_REG_ADCMD);
+ }
+
+ if (mask & 0x30) {
+ /* Sixth channel (INGENIC_ADC_TOUCH_YD): sample YP vs. YN */
+ writel(JZ_ADC_REG_ADCMD_VREFNYN | JZ_ADC_REG_ADCMD_VREFPVDD33
+ | JZ_ADC_REG_ADCMD_YPADC,
+ adc->base + JZ_ADC_REG_ADCMD);
+
+ /* Fifth channel (INGENIC_ADC_TOUCH_XD): sample XP vs. XN */
+ writel(JZ_ADC_REG_ADCMD_VREFNXN | JZ_ADC_REG_ADCMD_VREFPVDD33
+ | JZ_ADC_REG_ADCMD_XPADC,
+ adc->base + JZ_ADC_REG_ADCMD);
+ }
+
+ /* We're done */
+ writel(0, adc->base + JZ_ADC_REG_ADCMD);
+
+ mutex_unlock(&adc->lock);
+}
+
+static void ingenic_adc_set_config(struct ingenic_adc *adc,
+ uint32_t mask,
+ uint32_t val)
+{
+ uint32_t cfg;
+
+ mutex_lock(&adc->lock);
+
+ cfg = readl(adc->base + JZ_ADC_REG_CFG) & ~mask;
+ cfg |= val;
+ writel(cfg, adc->base + JZ_ADC_REG_CFG);
+
+ mutex_unlock(&adc->lock);
+}
+
+static void ingenic_adc_enable_unlocked(struct ingenic_adc *adc,
+ int engine,
+ bool enabled)
+{
+ u8 val;
+
+ val = readb(adc->base + JZ_ADC_REG_ENABLE);
+
+ if (enabled)
+ val |= BIT(engine);
+ else
+ val &= ~BIT(engine);
+
+ writeb(val, adc->base + JZ_ADC_REG_ENABLE);
+}
+
+static void ingenic_adc_enable(struct ingenic_adc *adc,
+ int engine,
+ bool enabled)
+{
+ mutex_lock(&adc->lock);
+ ingenic_adc_enable_unlocked(adc, engine, enabled);
+ mutex_unlock(&adc->lock);
+}
+
+static int ingenic_adc_capture(struct ingenic_adc *adc,
+ int engine)
+{
+ u32 cfg;
+ u8 val;
+ int ret;
+
+ /*
+ * Disable CMD_SEL temporarily, because it causes wrong VBAT readings,
+ * probably due to the switch of VREF. We must keep the lock here to
+ * avoid races with the buffer enable/disable functions.
+ */
+ mutex_lock(&adc->lock);
+ cfg = readl(adc->base + JZ_ADC_REG_CFG);
+ writel(cfg & ~JZ_ADC_REG_CFG_CMD_SEL, adc->base + JZ_ADC_REG_CFG);
+
+ ingenic_adc_enable_unlocked(adc, engine, true);
+ ret = readb_poll_timeout(adc->base + JZ_ADC_REG_ENABLE, val,
+ !(val & BIT(engine)), 250, 1000);
+ if (ret)
+ ingenic_adc_enable_unlocked(adc, engine, false);
+
+ writel(cfg, adc->base + JZ_ADC_REG_CFG);
+ mutex_unlock(&adc->lock);
+
+ return ret;
+}
+
+static int ingenic_adc_write_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long m)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+ struct device *dev = iio_dev->dev.parent;
+ int ret;
+
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->channel) {
+ case INGENIC_ADC_BATTERY:
+ if (!adc->soc_data->battery_vref_mode)
+ return -EINVAL;
+
+ ret = clk_enable(adc->clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable clock: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (val > JZ_ADC_BATTERY_LOW_VREF) {
+ ingenic_adc_set_config(adc,
+ JZ_ADC_REG_CFG_BAT_MD,
+ 0);
+ adc->low_vref_mode = false;
+ } else {
+ ingenic_adc_set_config(adc,
+ JZ_ADC_REG_CFG_BAT_MD,
+ JZ_ADC_REG_CFG_BAT_MD);
+ adc->low_vref_mode = true;
+ }
+
+ clk_disable(adc->clk);
+
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static const int jz4725b_adc_battery_raw_avail[] = {
+ 0, 1, (1 << JZ_ADC_BATTERY_LOW_VREF_BITS) - 1,
+};
+
+static const int jz4725b_adc_battery_scale_avail[] = {
+ JZ4725B_ADC_BATTERY_HIGH_VREF, JZ4725B_ADC_BATTERY_HIGH_VREF_BITS,
+ JZ_ADC_BATTERY_LOW_VREF, JZ_ADC_BATTERY_LOW_VREF_BITS,
+};
+
+static const int jz4740_adc_battery_raw_avail[] = {
+ 0, 1, (1 << JZ_ADC_BATTERY_LOW_VREF_BITS) - 1,
+};
+
+static const int jz4740_adc_battery_scale_avail[] = {
+ JZ4740_ADC_BATTERY_HIGH_VREF, JZ4740_ADC_BATTERY_HIGH_VREF_BITS,
+ JZ_ADC_BATTERY_LOW_VREF, JZ_ADC_BATTERY_LOW_VREF_BITS,
+};
+
+static const int jz4760_adc_battery_scale_avail[] = {
+ JZ4760_ADC_BATTERY_VREF, JZ4770_ADC_BATTERY_VREF_BITS,
+};
+
+static const int jz4770_adc_battery_raw_avail[] = {
+ 0, 1, (1 << JZ4770_ADC_BATTERY_VREF_BITS) - 1,
+};
+
+static const int jz4770_adc_battery_scale_avail[] = {
+ JZ4770_ADC_BATTERY_VREF, JZ4770_ADC_BATTERY_VREF_BITS,
+};
+
+static int jz4725b_adc_init_clk_div(struct device *dev, struct ingenic_adc *adc)
+{
+ struct clk *parent_clk;
+ unsigned long parent_rate, rate;
+ unsigned int div_main, div_10us;
+
+ parent_clk = clk_get_parent(adc->clk);
+ if (!parent_clk) {
+ dev_err(dev, "ADC clock has no parent\n");
+ return -ENODEV;
+ }
+ parent_rate = clk_get_rate(parent_clk);
+
+ /*
+ * The JZ4725B ADC works at 500 kHz to 8 MHz.
+ * We pick the highest rate possible.
+ * In practice we typically get 6 MHz, half of the 12 MHz EXT clock.
+ */
+ div_main = DIV_ROUND_UP(parent_rate, 8000000);
+ div_main = clamp(div_main, 1u, 64u);
+ rate = parent_rate / div_main;
+ if (rate < 500000 || rate > 8000000) {
+ dev_err(dev, "No valid divider for ADC main clock\n");
+ return -EINVAL;
+ }
+
+ /* We also need a divider that produces a 10us clock. */
+ div_10us = DIV_ROUND_UP(rate, 100000);
+
+ writel(((div_10us - 1) << JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB) |
+ (div_main - 1) << JZ_ADC_REG_ADCLK_CLKDIV_LSB,
+ adc->base + JZ_ADC_REG_ADCLK);
+
+ return 0;
+}
+
+static int jz4770_adc_init_clk_div(struct device *dev, struct ingenic_adc *adc)
+{
+ struct clk *parent_clk;
+ unsigned long parent_rate, rate;
+ unsigned int div_main, div_ms, div_10us;
+
+ parent_clk = clk_get_parent(adc->clk);
+ if (!parent_clk) {
+ dev_err(dev, "ADC clock has no parent\n");
+ return -ENODEV;
+ }
+ parent_rate = clk_get_rate(parent_clk);
+
+ /*
+ * The JZ4770 ADC works at 20 kHz to 200 kHz.
+ * We pick the highest rate possible.
+ */
+ div_main = DIV_ROUND_UP(parent_rate, 200000);
+ div_main = clamp(div_main, 1u, 256u);
+ rate = parent_rate / div_main;
+ if (rate < 20000 || rate > 200000) {
+ dev_err(dev, "No valid divider for ADC main clock\n");
+ return -EINVAL;
+ }
+
+ /* We also need a divider that produces a 10us clock. */
+ div_10us = DIV_ROUND_UP(rate, 10000);
+ /* And another, which produces a 1ms clock. */
+ div_ms = DIV_ROUND_UP(rate, 1000);
+
+ writel(((div_ms - 1) << JZ4770_ADC_REG_ADCLK_CLKDIVMS_LSB) |
+ ((div_10us - 1) << JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB) |
+ (div_main - 1) << JZ_ADC_REG_ADCLK_CLKDIV_LSB,
+ adc->base + JZ_ADC_REG_ADCLK);
+
+ return 0;
+}
+
+static const struct iio_chan_spec jz4740_channels[] = {
+ {
+ .extend_name = "aux",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_AUX,
+ .scan_index = -1,
+ },
+ {
+ .extend_name = "battery",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_BATTERY,
+ .scan_index = -1,
+ },
+};
+
+static const struct iio_chan_spec jz4760_channels[] = {
+ {
+ .extend_name = "aux",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_AUX0,
+ .scan_index = -1,
+ },
+ {
+ .extend_name = "aux1",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_AUX,
+ .scan_index = -1,
+ },
+ {
+ .extend_name = "aux2",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_AUX2,
+ .scan_index = -1,
+ },
+ {
+ .extend_name = "battery",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_BATTERY,
+ .scan_index = -1,
+ },
+};
+
+static const struct iio_chan_spec jz4770_channels[] = {
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_XP,
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16,
+ },
+ },
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_YP,
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16,
+ },
+ },
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_XN,
+ .scan_index = 2,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16,
+ },
+ },
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_YN,
+ .scan_index = 3,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16,
+ },
+ },
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_XD,
+ .scan_index = 4,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16,
+ },
+ },
+ {
+ .type = IIO_VOLTAGE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_YD,
+ .scan_index = 5,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16,
+ },
+ },
+ {
+ .extend_name = "aux",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_AUX,
+ .scan_index = -1,
+ },
+ {
+ .extend_name = "battery",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_BATTERY,
+ .scan_index = -1,
+ },
+ {
+ .extend_name = "aux2",
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .indexed = 1,
+ .channel = INGENIC_ADC_AUX2,
+ .scan_index = -1,
+ },
+};
+
+static const struct ingenic_adc_soc_data jz4725b_adc_soc_data = {
+ .battery_high_vref = JZ4725B_ADC_BATTERY_HIGH_VREF,
+ .battery_high_vref_bits = JZ4725B_ADC_BATTERY_HIGH_VREF_BITS,
+ .battery_raw_avail = jz4725b_adc_battery_raw_avail,
+ .battery_raw_avail_size = ARRAY_SIZE(jz4725b_adc_battery_raw_avail),
+ .battery_scale_avail = jz4725b_adc_battery_scale_avail,
+ .battery_scale_avail_size = ARRAY_SIZE(jz4725b_adc_battery_scale_avail),
+ .battery_vref_mode = true,
+ .has_aux_md = false,
+ .channels = jz4740_channels,
+ .num_channels = ARRAY_SIZE(jz4740_channels),
+ .init_clk_div = jz4725b_adc_init_clk_div,
+};
+
+static const struct ingenic_adc_soc_data jz4740_adc_soc_data = {
+ .battery_high_vref = JZ4740_ADC_BATTERY_HIGH_VREF,
+ .battery_high_vref_bits = JZ4740_ADC_BATTERY_HIGH_VREF_BITS,
+ .battery_raw_avail = jz4740_adc_battery_raw_avail,
+ .battery_raw_avail_size = ARRAY_SIZE(jz4740_adc_battery_raw_avail),
+ .battery_scale_avail = jz4740_adc_battery_scale_avail,
+ .battery_scale_avail_size = ARRAY_SIZE(jz4740_adc_battery_scale_avail),
+ .battery_vref_mode = true,
+ .has_aux_md = false,
+ .channels = jz4740_channels,
+ .num_channels = ARRAY_SIZE(jz4740_channels),
+ .init_clk_div = NULL, /* no ADCLK register on JZ4740 */
+};
+
+static const struct ingenic_adc_soc_data jz4760_adc_soc_data = {
+ .battery_high_vref = JZ4760_ADC_BATTERY_VREF,
+ .battery_high_vref_bits = JZ4770_ADC_BATTERY_VREF_BITS,
+ .battery_raw_avail = jz4770_adc_battery_raw_avail,
+ .battery_raw_avail_size = ARRAY_SIZE(jz4770_adc_battery_raw_avail),
+ .battery_scale_avail = jz4760_adc_battery_scale_avail,
+ .battery_scale_avail_size = ARRAY_SIZE(jz4760_adc_battery_scale_avail),
+ .battery_vref_mode = false,
+ .has_aux_md = true,
+ .channels = jz4760_channels,
+ .num_channels = ARRAY_SIZE(jz4760_channels),
+ .init_clk_div = jz4770_adc_init_clk_div,
+};
+
+static const struct ingenic_adc_soc_data jz4770_adc_soc_data = {
+ .battery_high_vref = JZ4770_ADC_BATTERY_VREF,
+ .battery_high_vref_bits = JZ4770_ADC_BATTERY_VREF_BITS,
+ .battery_raw_avail = jz4770_adc_battery_raw_avail,
+ .battery_raw_avail_size = ARRAY_SIZE(jz4770_adc_battery_raw_avail),
+ .battery_scale_avail = jz4770_adc_battery_scale_avail,
+ .battery_scale_avail_size = ARRAY_SIZE(jz4770_adc_battery_scale_avail),
+ .battery_vref_mode = false,
+ .has_aux_md = true,
+ .channels = jz4770_channels,
+ .num_channels = ARRAY_SIZE(jz4770_channels),
+ .init_clk_div = jz4770_adc_init_clk_div,
+};
+
+static int ingenic_adc_read_avail(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals,
+ int *type,
+ int *length,
+ long m)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ *type = IIO_VAL_INT;
+ *length = adc->soc_data->battery_raw_avail_size;
+ *vals = adc->soc_data->battery_raw_avail;
+ return IIO_AVAIL_RANGE;
+ case IIO_CHAN_INFO_SCALE:
+ *type = IIO_VAL_FRACTIONAL_LOG2;
+ *length = adc->soc_data->battery_scale_avail_size;
+ *vals = adc->soc_data->battery_scale_avail;
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ingenic_adc_read_chan_info_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ int *val)
+{
+ int cmd, ret, engine = (chan->channel == INGENIC_ADC_BATTERY);
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+
+ ret = clk_enable(adc->clk);
+ if (ret) {
+ dev_err(iio_dev->dev.parent, "Failed to enable clock: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* We cannot sample the aux channels in parallel. */
+ mutex_lock(&adc->aux_lock);
+ if (adc->soc_data->has_aux_md && engine == 0) {
+ switch (chan->channel) {
+ case INGENIC_ADC_AUX0:
+ cmd = 0;
+ break;
+ case INGENIC_ADC_AUX:
+ cmd = 1;
+ break;
+ case INGENIC_ADC_AUX2:
+ cmd = 2;
+ break;
+ }
+
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_AUX_MD, cmd);
+ }
+
+ ret = ingenic_adc_capture(adc, engine);
+ if (ret)
+ goto out;
+
+ switch (chan->channel) {
+ case INGENIC_ADC_AUX0:
+ case INGENIC_ADC_AUX:
+ case INGENIC_ADC_AUX2:
+ *val = readw(adc->base + JZ_ADC_REG_ADSDAT);
+ break;
+ case INGENIC_ADC_BATTERY:
+ *val = readw(adc->base + JZ_ADC_REG_ADBDAT);
+ break;
+ }
+
+ ret = IIO_VAL_INT;
+out:
+ mutex_unlock(&adc->aux_lock);
+ clk_disable(adc->clk);
+
+ return ret;
+}
+
+static int ingenic_adc_read_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+
+ switch (m) {
+ case IIO_CHAN_INFO_RAW:
+ return ingenic_adc_read_chan_info_raw(iio_dev, chan, val);
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->channel) {
+ case INGENIC_ADC_AUX0:
+ case INGENIC_ADC_AUX:
+ case INGENIC_ADC_AUX2:
+ *val = JZ_ADC_AUX_VREF;
+ *val2 = JZ_ADC_AUX_VREF_BITS;
+ break;
+ case INGENIC_ADC_BATTERY:
+ if (adc->low_vref_mode) {
+ *val = JZ_ADC_BATTERY_LOW_VREF;
+ *val2 = JZ_ADC_BATTERY_LOW_VREF_BITS;
+ } else {
+ *val = adc->soc_data->battery_high_vref;
+ *val2 = adc->soc_data->battery_high_vref_bits;
+ }
+ break;
+ }
+
+ return IIO_VAL_FRACTIONAL_LOG2;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ingenic_adc_fwnode_xlate(struct iio_dev *iio_dev,
+ const struct fwnode_reference_args *iiospec)
+{
+ int i;
+
+ if (!iiospec->nargs)
+ return -EINVAL;
+
+ for (i = 0; i < iio_dev->num_channels; ++i)
+ if (iio_dev->channels[i].channel == iiospec->args[0])
+ return i;
+
+ return -EINVAL;
+}
+
+static const struct iio_info ingenic_adc_info = {
+ .write_raw = ingenic_adc_write_raw,
+ .read_raw = ingenic_adc_read_raw,
+ .read_avail = ingenic_adc_read_avail,
+ .fwnode_xlate = ingenic_adc_fwnode_xlate,
+};
+
+static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+ int ret;
+
+ ret = clk_enable(adc->clk);
+ if (ret) {
+ dev_err(iio_dev->dev.parent, "Failed to enable clock: %d\n",
+ ret);
+ return ret;
+ }
+
+ /* It takes significant time for the touchscreen hw to stabilize. */
+ msleep(50);
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
+ JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
+ JZ_ADC_REG_CFG_PULL_UP(4));
+
+ writew(80, adc->base + JZ_ADC_REG_ADWAIT);
+ writew(2, adc->base + JZ_ADC_REG_ADSAME);
+ writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
+ writel(0, adc->base + JZ_ADC_REG_ADTCH);
+
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_CMD_SEL,
+ JZ_ADC_REG_CFG_CMD_SEL);
+ ingenic_adc_set_adcmd(iio_dev, iio_dev->active_scan_mask[0]);
+
+ ingenic_adc_enable(adc, 2, true);
+
+ return 0;
+}
+
+static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
+{
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+
+ ingenic_adc_enable(adc, 2, false);
+
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_CMD_SEL, 0);
+
+ writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
+ writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
+ writew(0, adc->base + JZ_ADC_REG_ADSAME);
+ writew(0, adc->base + JZ_ADC_REG_ADWAIT);
+ clk_disable(adc->clk);
+
+ return 0;
+}
+
+static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops = {
+ .postenable = &ingenic_adc_buffer_enable,
+ .predisable = &ingenic_adc_buffer_disable
+};
+
+static irqreturn_t ingenic_adc_irq(int irq, void *data)
+{
+ struct iio_dev *iio_dev = data;
+ struct ingenic_adc *adc = iio_priv(iio_dev);
+ unsigned long mask = iio_dev->active_scan_mask[0];
+ unsigned int i;
+ u32 tdat[3];
+
+ for (i = 0; i < ARRAY_SIZE(tdat); mask >>= 2, i++) {
+ if (mask & 0x3)
+ tdat[i] = readl(adc->base + JZ_ADC_REG_ADTCH);
+ else
+ tdat[i] = 0;
+ }
+
+ iio_push_to_buffers(iio_dev, tdat);
+ writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
+
+ return IRQ_HANDLED;
+}
+
+static int ingenic_adc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct iio_dev *iio_dev;
+ struct ingenic_adc *adc;
+ const struct ingenic_adc_soc_data *soc_data;
+ int irq, ret;
+
+ soc_data = device_get_match_data(dev);
+ if (!soc_data)
+ return -EINVAL;
+
+ iio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
+ if (!iio_dev)
+ return -ENOMEM;
+
+ adc = iio_priv(iio_dev);
+ mutex_init(&adc->lock);
+ mutex_init(&adc->aux_lock);
+ adc->soc_data = soc_data;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
+ dev_name(dev), iio_dev);
+ if (ret < 0) {
+ dev_err(dev, "Failed to request irq: %d\n", ret);
+ return ret;
+ }
+
+ adc->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(adc->base))
+ return PTR_ERR(adc->base);
+
+ adc->clk = devm_clk_get_prepared(dev, "adc");
+ if (IS_ERR(adc->clk)) {
+ dev_err(dev, "Unable to get clock\n");
+ return PTR_ERR(adc->clk);
+ }
+
+ ret = clk_enable(adc->clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable clock\n");
+ return ret;
+ }
+
+ /* Set clock dividers. */
+ if (soc_data->init_clk_div) {
+ ret = soc_data->init_clk_div(dev, adc);
+ if (ret) {
+ clk_disable_unprepare(adc->clk);
+ return ret;
+ }
+ }
+
+ /* Put hardware in a known passive state. */
+ writeb(0x00, adc->base + JZ_ADC_REG_ENABLE);
+ writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
+
+ /* JZ4760B specific */
+ if (device_property_present(dev, "ingenic,use-internal-divider"))
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_VBAT_SEL,
+ JZ_ADC_REG_CFG_VBAT_SEL);
+ else
+ ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_VBAT_SEL, 0);
+
+ usleep_range(2000, 3000); /* Must wait at least 2ms. */
+ clk_disable(adc->clk);
+
+ iio_dev->name = "jz-adc";
+ iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
+ iio_dev->setup_ops = &ingenic_buffer_setup_ops;
+ iio_dev->channels = soc_data->channels;
+ iio_dev->num_channels = soc_data->num_channels;
+ iio_dev->info = &ingenic_adc_info;
+
+ ret = devm_iio_device_register(dev, iio_dev);
+ if (ret)
+ dev_err(dev, "Unable to register IIO device\n");
+
+ return ret;
+}
+
+static const struct of_device_id ingenic_adc_of_match[] = {
+ { .compatible = "ingenic,jz4725b-adc", .data = &jz4725b_adc_soc_data, },
+ { .compatible = "ingenic,jz4740-adc", .data = &jz4740_adc_soc_data, },
+ { .compatible = "ingenic,jz4760-adc", .data = &jz4760_adc_soc_data, },
+ { .compatible = "ingenic,jz4760b-adc", .data = &jz4760_adc_soc_data, },
+ { .compatible = "ingenic,jz4770-adc", .data = &jz4770_adc_soc_data, },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ingenic_adc_of_match);
+
+static struct platform_driver ingenic_adc_driver = {
+ .driver = {
+ .name = "ingenic-adc",
+ .of_match_table = ingenic_adc_of_match,
+ },
+ .probe = ingenic_adc_probe,
+};
+module_platform_driver(ingenic_adc_driver);
+MODULE_LICENSE("GPL v2");