+ *
+ * This driver is for the Round Robin ADC found in the pmi8998 and pm660 PMICs.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/spmi.h>
+#include <linux/types.h>
+#include <linux/units.h>
+
+#include <asm/unaligned.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+
+#include <soc/qcom/qcom-spmi-pmic.h>
+
+#define DRIVER_NAME "qcom-spmi-rradc"
+
+#define RR_ADC_EN_CTL 0x46
+#define RR_ADC_SKIN_TEMP_LSB 0x50
+#define RR_ADC_SKIN_TEMP_MSB 0x51
+#define RR_ADC_CTL 0x52
+#define RR_ADC_CTL_CONTINUOUS_SEL BIT(3)
+#define RR_ADC_LOG 0x53
+#define RR_ADC_LOG_CLR_CTRL BIT(0)
+
+#define RR_ADC_FAKE_BATT_LOW_LSB 0x58
+#define RR_ADC_FAKE_BATT_LOW_MSB 0x59
+#define RR_ADC_FAKE_BATT_HIGH_LSB 0x5A
+#define RR_ADC_FAKE_BATT_HIGH_MSB 0x5B
+
+#define RR_ADC_BATT_ID_CTRL 0x60
+#define RR_ADC_BATT_ID_CTRL_CHANNEL_CONV BIT(0)
+#define RR_ADC_BATT_ID_TRIGGER 0x61
+#define RR_ADC_BATT_ID_STS 0x62
+#define RR_ADC_BATT_ID_CFG 0x63
+#define BATT_ID_SETTLE_MASK GENMASK(7, 5)
+#define RR_ADC_BATT_ID_5_LSB 0x66
+#define RR_ADC_BATT_ID_5_MSB 0x67
+#define RR_ADC_BATT_ID_15_LSB 0x68
+#define RR_ADC_BATT_ID_15_MSB 0x69
+#define RR_ADC_BATT_ID_150_LSB 0x6A
+#define RR_ADC_BATT_ID_150_MSB 0x6B
+
+#define RR_ADC_BATT_THERM_CTRL 0x70
+#define RR_ADC_BATT_THERM_TRIGGER 0x71
+#define RR_ADC_BATT_THERM_STS 0x72
+#define RR_ADC_BATT_THERM_CFG 0x73
+#define RR_ADC_BATT_THERM_LSB 0x74
+#define RR_ADC_BATT_THERM_MSB 0x75
+#define RR_ADC_BATT_THERM_FREQ 0x76
+
+#define RR_ADC_AUX_THERM_CTRL 0x80
+#define RR_ADC_AUX_THERM_TRIGGER 0x81
+#define RR_ADC_AUX_THERM_STS 0x82
+#define RR_ADC_AUX_THERM_CFG 0x83
+#define RR_ADC_AUX_THERM_LSB 0x84
+#define RR_ADC_AUX_THERM_MSB 0x85
+
+#define RR_ADC_SKIN_HOT 0x86
+#define RR_ADC_SKIN_TOO_HOT 0x87
+
+#define RR_ADC_AUX_THERM_C1 0x88
+#define RR_ADC_AUX_THERM_C2 0x89
+#define RR_ADC_AUX_THERM_C3 0x8A
+#define RR_ADC_AUX_THERM_HALF_RANGE 0x8B
+
+#define RR_ADC_USB_IN_V_CTRL 0x90
+#define RR_ADC_USB_IN_V_TRIGGER 0x91
+#define RR_ADC_USB_IN_V_STS 0x92
+#define RR_ADC_USB_IN_V_LSB 0x94
+#define RR_ADC_USB_IN_V_MSB 0x95
+#define RR_ADC_USB_IN_I_CTRL 0x98
+#define RR_ADC_USB_IN_I_TRIGGER 0x99
+#define RR_ADC_USB_IN_I_STS 0x9A
+#define RR_ADC_USB_IN_I_LSB 0x9C
+#define RR_ADC_USB_IN_I_MSB 0x9D
+
+#define RR_ADC_DC_IN_V_CTRL 0xA0
+#define RR_ADC_DC_IN_V_TRIGGER 0xA1
+#define RR_ADC_DC_IN_V_STS 0xA2
+#define RR_ADC_DC_IN_V_LSB 0xA4
+#define RR_ADC_DC_IN_V_MSB 0xA5
+#define RR_ADC_DC_IN_I_CTRL 0xA8
+#define RR_ADC_DC_IN_I_TRIGGER 0xA9
+#define RR_ADC_DC_IN_I_STS 0xAA
+#define RR_ADC_DC_IN_I_LSB 0xAC
+#define RR_ADC_DC_IN_I_MSB 0xAD
+
+#define RR_ADC_PMI_DIE_TEMP_CTRL 0xB0
+#define RR_ADC_PMI_DIE_TEMP_TRIGGER 0xB1
+#define RR_ADC_PMI_DIE_TEMP_STS 0xB2
+#define RR_ADC_PMI_DIE_TEMP_CFG 0xB3
+#define RR_ADC_PMI_DIE_TEMP_LSB 0xB4
+#define RR_ADC_PMI_DIE_TEMP_MSB 0xB5
+
+#define RR_ADC_CHARGER_TEMP_CTRL 0xB8
+#define RR_ADC_CHARGER_TEMP_TRIGGER 0xB9
+#define RR_ADC_CHARGER_TEMP_STS 0xBA
+#define RR_ADC_CHARGER_TEMP_CFG 0xBB
+#define RR_ADC_CHARGER_TEMP_LSB 0xBC
+#define RR_ADC_CHARGER_TEMP_MSB 0xBD
+#define RR_ADC_CHARGER_HOT 0xBE
+#define RR_ADC_CHARGER_TOO_HOT 0xBF
+
+#define RR_ADC_GPIO_CTRL 0xC0
+#define RR_ADC_GPIO_TRIGGER 0xC1
+#define RR_ADC_GPIO_STS 0xC2
+#define RR_ADC_GPIO_LSB 0xC4
+#define RR_ADC_GPIO_MSB 0xC5
+
+#define RR_ADC_ATEST_CTRL 0xC8
+#define RR_ADC_ATEST_TRIGGER 0xC9
+#define RR_ADC_ATEST_STS 0xCA
+#define RR_ADC_ATEST_LSB 0xCC
+#define RR_ADC_ATEST_MSB 0xCD
+#define RR_ADC_SEC_ACCESS 0xD0
+
+#define RR_ADC_PERPH_RESET_CTL2 0xD9
+#define RR_ADC_PERPH_RESET_CTL3 0xDA
+#define RR_ADC_PERPH_RESET_CTL4 0xDB
+#define RR_ADC_INT_TEST1 0xE0
+#define RR_ADC_INT_TEST_VAL 0xE1
+
+#define RR_ADC_TM_TRIGGER_CTRLS 0xE2
+#define RR_ADC_TM_ADC_CTRLS 0xE3
+#define RR_ADC_TM_CNL_CTRL 0xE4
+#define RR_ADC_TM_BATT_ID_CTRL 0xE5
+#define RR_ADC_TM_THERM_CTRL 0xE6
+#define RR_ADC_TM_CONV_STS 0xE7
+#define RR_ADC_TM_ADC_READ_LSB 0xE8
+#define RR_ADC_TM_ADC_READ_MSB 0xE9
+#define RR_ADC_TM_ATEST_MUX_1 0xEA
+#define RR_ADC_TM_ATEST_MUX_2 0xEB
+#define RR_ADC_TM_REFERENCES 0xED
+#define RR_ADC_TM_MISC_CTL 0xEE
+#define RR_ADC_TM_RR_CTRL 0xEF
+
+#define RR_ADC_TRIGGER_EVERY_CYCLE BIT(7)
+#define RR_ADC_TRIGGER_CTL BIT(0)
+
+#define RR_ADC_BATT_ID_RANGE 820
+
+#define RR_ADC_BITS 10
+#define RR_ADC_CHAN_MSB (1 << RR_ADC_BITS)
+#define RR_ADC_FS_VOLTAGE_MV 2500
+
+/* BATT_THERM 0.25K/LSB */
+#define RR_ADC_BATT_THERM_LSB_K 4
+
+#define RR_ADC_TEMP_FS_VOLTAGE_NUM 5000000
+#define RR_ADC_TEMP_FS_VOLTAGE_DEN 3
+#define RR_ADC_DIE_TEMP_OFFSET 601400
+#define RR_ADC_DIE_TEMP_SLOPE 2
+#define RR_ADC_DIE_TEMP_OFFSET_MILLI_DEGC 25000
+
+#define RR_ADC_CHG_TEMP_GF_OFFSET_UV 1303168
+#define RR_ADC_CHG_TEMP_GF_SLOPE_UV_PER_C 3784
+#define RR_ADC_CHG_TEMP_SMIC_OFFSET_UV 1338433
+#define RR_ADC_CHG_TEMP_SMIC_SLOPE_UV_PER_C 3655
+#define RR_ADC_CHG_TEMP_660_GF_OFFSET_UV 1309001
+#define RR_ADC_CHG_TEMP_660_GF_SLOPE_UV_PER_C 3403
+#define RR_ADC_CHG_TEMP_660_SMIC_OFFSET_UV 1295898
+#define RR_ADC_CHG_TEMP_660_SMIC_SLOPE_UV_PER_C 3596
+#define RR_ADC_CHG_TEMP_660_MGNA_OFFSET_UV 1314779
+#define RR_ADC_CHG_TEMP_660_MGNA_SLOPE_UV_PER_C 3496
+#define RR_ADC_CHG_TEMP_OFFSET_MILLI_DEGC 25000
+#define RR_ADC_CHG_THRESHOLD_SCALE 4
+
+#define RR_ADC_VOLT_INPUT_FACTOR 8
+#define RR_ADC_CURR_INPUT_FACTOR 2000
+#define RR_ADC_CURR_USBIN_INPUT_FACTOR_MIL 1886
+#define RR_ADC_CURR_USBIN_660_FACTOR_MIL 9
+#define RR_ADC_CURR_USBIN_660_UV_VAL 579500
+
+#define RR_ADC_GPIO_FS_RANGE 5000
+#define RR_ADC_COHERENT_CHECK_RETRY 5
+#define RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN 16
+
+#define RR_ADC_STS_CHANNEL_READING_MASK GENMASK(1, 0)
+#define RR_ADC_STS_CHANNEL_STS BIT(1)
+
+#define RR_ADC_TP_REV_VERSION1 21
+#define RR_ADC_TP_REV_VERSION2 29
+#define RR_ADC_TP_REV_VERSION3 32
+
+#define RRADC_BATT_ID_DELAY_MAX 8
+
+enum rradc_channel_id {
+ RR_ADC_BATT_ID = 0,
+ RR_ADC_BATT_THERM,
+ RR_ADC_SKIN_TEMP,
+ RR_ADC_USBIN_I,
+ RR_ADC_USBIN_V,
+ RR_ADC_DCIN_I,
+ RR_ADC_DCIN_V,
+ RR_ADC_DIE_TEMP,
+ RR_ADC_CHG_TEMP,
+ RR_ADC_GPIO,
+ RR_ADC_CHAN_MAX
+};
+
+struct rradc_chip;
+
+/**
+ * struct rradc_channel - rradc channel data
+ * @label: channel label
+ * @lsb: Channel least significant byte
+ * @status: Channel status address
+ * @size: number of bytes to read
+ * @trigger_addr: Trigger address, trigger is only used on some channels
+ * @trigger_mask: Trigger mask
+ * @scale_fn: Post process callback for channels which can't be exposed
+ * as offset + scale.
+ */
+struct rradc_channel {
+ const char *label;
+ u8 lsb;
+ u8 status;
+ int size;
+ int trigger_addr;
+ int trigger_mask;
+ int (*scale_fn)(struct rradc_chip *chip, u16 adc_code, int *result);
+};
+
+struct rradc_chip {
+ struct device *dev;
+ const struct qcom_spmi_pmic *pmic;
+ /*
+ * Lock held while doing channel conversion
+ * involving multiple register read/writes
+ */
+ struct mutex conversion_lock;
+ struct regmap *regmap;
+ u32 base;
+ int batt_id_delay;
+ u16 batt_id_data;
+};
+
+static const int batt_id_delays[] = { 0, 1, 4, 12, 20, 40, 60, 80 };
+static const struct rradc_channel rradc_chans[RR_ADC_CHAN_MAX];
+static const struct iio_chan_spec rradc_iio_chans[RR_ADC_CHAN_MAX];
+
+static int rradc_read(struct rradc_chip *chip, u16 addr, __le16 *buf, int len)
+{
+ int ret, retry_cnt = 0;
+ __le16 data_check[RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN / 2];
+
+ if (len > RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN) {
+ dev_err(chip->dev,
+ "Can't read more than %d bytes, but asked to read %d bytes.\n",
+ RR_ADC_CHAN_MAX_CONTINUOUS_BUFFER_LEN, len);
+ return -EINVAL;
+ }
+
+ while (retry_cnt < RR_ADC_COHERENT_CHECK_RETRY) {
+ ret = regmap_bulk_read(chip->regmap, chip->base + addr, buf,
+ len);
+ if (ret < 0) {
+ dev_err(chip->dev, "rr_adc reg 0x%x failed :%d\n", addr,
+ ret);
+ return ret;
+ }
+
+ ret = regmap_bulk_read(chip->regmap, chip->base + addr,
+ data_check, len);
+ if (ret < 0) {
+ dev_err(chip->dev, "rr_adc reg 0x%x failed :%d\n", addr,
+ ret);
+ return ret;
+ }
+
+ if (memcmp(buf, data_check, len) != 0) {
+ retry_cnt++;
+ dev_dbg(chip->dev,
+ "coherent read error, retry_cnt:%d\n",
+ retry_cnt);
+ continue;
+ }
+
+ break;
+ }
+
+ if (retry_cnt == RR_ADC_COHERENT_CHECK_RETRY)
+ dev_err(chip->dev, "Retry exceeded for coherrency check\n");
+
+ return ret;
+}
+
+static int rradc_get_fab_coeff(struct rradc_chip *chip, int64_t *offset,
+ int64_t *slope)
+{
+ if (chip->pmic->subtype == PM660_SUBTYPE) {
+ switch (chip->pmic->fab_id) {
+ case PM660_FAB_ID_GF:
+ *offset = RR_ADC_CHG_TEMP_660_GF_OFFSET_UV;
+ *slope = RR_ADC_CHG_TEMP_660_GF_SLOPE_UV_PER_C;
+ return 0;
+ case PM660_FAB_ID_TSMC:
+ *offset = RR_ADC_CHG_TEMP_660_SMIC_OFFSET_UV;
+ *slope = RR_ADC_CHG_TEMP_660_SMIC_SLOPE_UV_PER_C;
+ return 0;
+ default:
+ *offset = RR_ADC_CHG_TEMP_660_MGNA_OFFSET_UV;
+ *slope = RR_ADC_CHG_TEMP_660_MGNA_SLOPE_UV_PER_C;
+ }
+ } else if (chip->pmic->subtype == PMI8998_SUBTYPE) {
+ switch (chip->pmic->fab_id) {
+ case PMI8998_FAB_ID_GF:
+ *offset = RR_ADC_CHG_TEMP_GF_OFFSET_UV;
+ *slope = RR_ADC_CHG_TEMP_GF_SLOPE_UV_PER_C;
+ return 0;
+ case PMI8998_FAB_ID_SMIC:
+ *offset = RR_ADC_CHG_TEMP_SMIC_OFFSET_UV;
+ *slope = RR_ADC_CHG_TEMP_SMIC_SLOPE_UV_PER_C;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * These functions explicitly cast int64_t to int.
+ * They will never overflow, as the values are small enough.
+ */
+static int rradc_post_process_batt_id(struct rradc_chip *chip, u16 adc_code,
+ int *result_ohms)
+{
+ uint32_t current_value;
+ int64_t r_id;
+
+ current_value = chip->batt_id_data;
+ r_id = ((int64_t)adc_code * RR_ADC_FS_VOLTAGE_MV);
+ r_id = div64_s64(r_id, (RR_ADC_CHAN_MSB * current_value));
+ *result_ohms = (int)(r_id * MILLI);
+
+ return 0;
+}
+
+static int rradc_enable_continuous_mode(struct rradc_chip *chip)
+{
+ int ret;
+
+ /* Clear channel log */
+ ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_LOG,
+ RR_ADC_LOG_CLR_CTRL, RR_ADC_LOG_CLR_CTRL);
+ if (ret < 0) {
+ dev_err(chip->dev, "log ctrl update to clear failed:%d\n", ret);
+ return ret;
+ }
+
+ ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_LOG,
+ RR_ADC_LOG_CLR_CTRL, 0);
+ if (ret < 0) {
+ dev_err(chip->dev, "log ctrl update to not clear failed:%d\n",
+ ret);
+ return ret;
+ }
+
+ /* Switch to continuous mode */
+ ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_CTL,
+ RR_ADC_CTL_CONTINUOUS_SEL,
+ RR_ADC_CTL_CONTINUOUS_SEL);
+ if (ret < 0)
+ dev_err(chip->dev, "Update to continuous mode failed:%d\n",
+ ret);
+
+ return ret;
+}
+
+static int rradc_disable_continuous_mode(struct rradc_chip *chip)
+{
+ int ret;
+
+ /* Switch to non continuous mode */
+ ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_CTL,
+ RR_ADC_CTL_CONTINUOUS_SEL, 0);
+ if (ret < 0)
+ dev_err(chip->dev, "Update to non-continuous mode failed:%d\n",
+ ret);
+
+ return ret;
+}
+
+static bool rradc_is_ready(struct rradc_chip *chip,
+ enum rradc_channel_id chan_address)
+{
+ const struct rradc_channel *chan = &rradc_chans[chan_address];
+ int ret;
+ unsigned int status, mask;
+
+ /* BATT_ID STS bit does not get set initially */
+ switch (chan_address) {
+ case RR_ADC_BATT_ID:
+ mask = RR_ADC_STS_CHANNEL_STS;
+ break;
+ default:
+ mask = RR_ADC_STS_CHANNEL_READING_MASK;
+ break;
+ }
+
+ ret = regmap_read(chip->regmap, chip->base + chan->status, &status);
+ if (ret < 0 || !(status & mask))
+ return false;
+
+ return true;
+}
+
+static int rradc_read_status_in_cont_mode(struct rradc_chip *chip,
+ enum rradc_channel_id chan_address)
+{
+ const struct rradc_channel *chan = &rradc_chans[chan_address];
+ const struct iio_chan_spec *iio_chan = &rradc_iio_chans[chan_address];
+ int ret, i;
+
+ if (chan->trigger_mask == 0) {
+ dev_err(chip->dev, "Channel doesn't have a trigger mask\n");
+ return -EINVAL;
+ }
+
+ ret = regmap_update_bits(chip->regmap, chip->base + chan->trigger_addr,
+ chan->trigger_mask, chan->trigger_mask);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Failed to apply trigger for channel '%s' ret=%d\n",
+ iio_chan->extend_name, ret);
+ return ret;
+ }
+
+ ret = rradc_enable_continuous_mode(chip);
+ if (ret < 0) {
+ dev_err(chip->dev, "Failed to switch to continuous mode\n");
+ goto disable_trigger;
+ }
+
+ /*
+ * The wait/sleep values were found through trial and error,
+ * this is mostly for the battery ID channel which takes some
+ * time to settle.
+ */
+ for (i = 0; i < 5; i++) {
+ if (rradc_is_ready(chip, chan_address))
+ break;
+ usleep_range(50000, 50000 + 500);
+ }
+
+ if (i == 5) {
+ dev_err(chip->dev, "Channel '%s' is not ready\n",
+ iio_chan->extend_name);
+ ret = -ETIMEDOUT;
+ }
+
+ rradc_disable_continuous_mode(chip);
+
+disable_trigger:
+ regmap_update_bits(chip->regmap, chip->base + chan->trigger_addr,
+ chan->trigger_mask, 0);
+
+ return ret;
+}
+
+static int rradc_prepare_batt_id_conversion(struct rradc_chip *chip,
+ enum rradc_channel_id chan_address,
+ u16 *data)
+{
+ int ret;
+
+ ret = regmap_update_bits(chip->regmap, chip->base + RR_ADC_BATT_ID_CTRL,
+ RR_ADC_BATT_ID_CTRL_CHANNEL_CONV,
+ RR_ADC_BATT_ID_CTRL_CHANNEL_CONV);
+ if (ret < 0) {
+ dev_err(chip->dev, "Enabling BATT ID channel failed:%d\n", ret);
+ return ret;
+ }
+
+ ret = regmap_update_bits(chip->regmap,
+ chip->base + RR_ADC_BATT_ID_TRIGGER,
+ RR_ADC_TRIGGER_CTL, RR_ADC_TRIGGER_CTL);
+ if (ret < 0) {
+ dev_err(chip->dev, "BATT_ID trigger set failed:%d\n", ret);
+ goto out_disable_batt_id;
+ }
+
+ ret = rradc_read_status_in_cont_mode(chip, chan_address);
+
+ /* Reset registers back to default values */
+ regmap_update_bits(chip->regmap, chip->base + RR_ADC_BATT_ID_TRIGGER,
+ RR_ADC_TRIGGER_CTL, 0);
+
+out_disable_batt_id:
+ regmap_update_bits(chip->regmap, chip->base + RR_ADC_BATT_ID_CTRL,
+ RR_ADC_BATT_ID_CTRL_CHANNEL_CONV, 0);
+
+ return ret;
+}
+
+static int rradc_do_conversion(struct rradc_chip *chip,
+ enum rradc_channel_id chan_address, u16 *data)
+{
+ const struct rradc_channel *chan = &rradc_chans[chan_address];
+ const struct iio_chan_spec *iio_chan = &rradc_iio_chans[chan_address];
+ int ret;
+ __le16 buf[3];
+
+ mutex_lock(&chip->conversion_lock);
+
+ switch (chan_address) {
+ case RR_ADC_BATT_ID:
+ ret = rradc_prepare_batt_id_conversion(chip, chan_address, data);
+ if (ret < 0) {
+ dev_err(chip->dev, "Battery ID conversion failed:%d\n",
+ ret);
+ goto unlock_out;
+ }
+ break;
+
+ case RR_ADC_USBIN_V:
+ case RR_ADC_DIE_TEMP:
+ ret = rradc_read_status_in_cont_mode(chip, chan_address);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Error reading in continuous mode:%d\n", ret);
+ goto unlock_out;
+ }
+ break;
+ default:
+ if (!rradc_is_ready(chip, chan_address)) {
+ /*
+ * Usually this means the channel isn't attached, for example
+ * the in_voltage_usbin_v_input channel will not be ready if
+ * no USB cable is attached
+ */
+ dev_dbg(chip->dev, "channel '%s' is not ready\n",
+ iio_chan->extend_name);
+ ret = -ENODATA;
+ goto unlock_out;
+ }
+ break;
+ }
+
+ ret = rradc_read(chip, chan->lsb, buf, chan->size);
+ if (ret) {
+ dev_err(chip->dev, "read data failed\n");
+ goto unlock_out;
+ }
+
+ /*
+ * For the battery ID we read the register for every ID ADC and then
+ * see which one is actually connected.
+ */
+ if (chan_address == RR_ADC_BATT_ID) {
+ u16 batt_id_150 = le16_to_cpu(buf[2]);
+ u16 batt_id_15 = le16_to_cpu(buf[1]);
+ u16 batt_id_5 = le16_to_cpu(buf[0]);
+
+ if (!batt_id_150 && !batt_id_15 && !batt_id_5) {
+ dev_err(chip->dev,
+ "Invalid batt_id values with all zeros\n");
+ ret = -EINVAL;
+ goto unlock_out;
+ }
+
+ if (batt_id_150 <= RR_ADC_BATT_ID_RANGE) {
+ *data = batt_id_150;
+ chip->batt_id_data = 150;
+ } else if (batt_id_15 <= RR_ADC_BATT_ID_RANGE) {
+ *data = batt_id_15;
+ chip->batt_id_data = 15;
+ } else {
+ *data = batt_id_5;
+ chip->batt_id_data = 5;
+ }
+ } else {
+ /*
+ * All of the other channels are either 1 or 2 bytes.
+ * We can rely on the second byte being 0 for 1-byte channels.
+ */
+ *data = le16_to_cpu(buf[0]);
+ }
+
+unlock_out:
+ mutex_unlock(&chip->conversion_lock);
+
+ return ret;
+}
+
+static int rradc_read_scale(struct rradc_chip *chip, int chan_address, int *val,
+ int *val2)
+{
+ int64_t fab_offset, fab_slope;
+ int ret;
+
+ ret = rradc_get_fab_coeff(chip, &fab_offset, &fab_slope);
+ if (ret < 0) {
+ dev_err(chip->dev, "Unable to get fab id coefficients\n");
+ return -EINVAL;
+ }
+
+ switch (chan_address) {
+ case RR_ADC_SKIN_TEMP:
+ *val = MILLI;
+ *val2 = RR_ADC_BATT_THERM_LSB_K;
+ return IIO_VAL_FRACTIONAL;
+ case RR_ADC_USBIN_I:
+ *val = RR_ADC_CURR_USBIN_INPUT_FACTOR_MIL *
+ RR_ADC_FS_VOLTAGE_MV;
+ *val2 = RR_ADC_CHAN_MSB;
+ return IIO_VAL_FRACTIONAL;
+ case RR_ADC_DCIN_I:
+ *val = RR_ADC_CURR_INPUT_FACTOR * RR_ADC_FS_VOLTAGE_MV;
+ *val2 = RR_ADC_CHAN_MSB;
+ return IIO_VAL_FRACTIONAL;
+ case RR_ADC_USBIN_V:
+ case RR_ADC_DCIN_V:
+ *val = RR_ADC_VOLT_INPUT_FACTOR * RR_ADC_FS_VOLTAGE_MV * MILLI;
+ *val2 = RR_ADC_CHAN_MSB;
+ return IIO_VAL_FRACTIONAL;
+ case RR_ADC_GPIO:
+ *val = RR_ADC_GPIO_FS_RANGE;
+ *val2 = RR_ADC_CHAN_MSB;
+ return IIO_VAL_FRACTIONAL;
+ case RR_ADC_CHG_TEMP:
+ /*
+ * We divide val2 by MILLI instead of multiplying val
+ * to avoid an integer overflow.
+ */
+ *val = -RR_ADC_TEMP_FS_VOLTAGE_NUM;
+ *val2 = div64_s64(RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+ fab_slope,
+ MILLI);
+
+ return IIO_VAL_FRACTIONAL;
+ case RR_ADC_DIE_TEMP:
+ *val = RR_ADC_TEMP_FS_VOLTAGE_NUM;
+ *val2 = RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+ RR_ADC_DIE_TEMP_SLOPE;
+
+ return IIO_VAL_FRACTIONAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int rradc_read_offset(struct rradc_chip *chip, int chan_address, int *val)
+{
+ int64_t fab_offset, fab_slope;
+ int64_t offset1, offset2;
+ int ret;
+
+ switch (chan_address) {
+ case RR_ADC_SKIN_TEMP:
+ /*
+ * Offset from kelvin to degC, divided by the
+ * scale factor (250). We lose some precision here.
+ * 273150 / 250 = 1092.6
+ */
+ *val = div64_s64(ABSOLUTE_ZERO_MILLICELSIUS,
+ (MILLI / RR_ADC_BATT_THERM_LSB_K));
+ return IIO_VAL_INT;
+ case RR_ADC_CHG_TEMP:
+ ret = rradc_get_fab_coeff(chip, &fab_offset, &fab_slope);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "Unable to get fab id coefficients\n");
+ return -EINVAL;
+ }
+ offset1 = -(fab_offset * RR_ADC_TEMP_FS_VOLTAGE_DEN *
+ RR_ADC_CHAN_MSB);
+ offset1 += (int64_t)RR_ADC_TEMP_FS_VOLTAGE_NUM / 2ULL;
+ offset1 = div64_s64(offset1,
+ (int64_t)(RR_ADC_TEMP_FS_VOLTAGE_NUM));
+
+ offset2 = (int64_t)RR_ADC_CHG_TEMP_OFFSET_MILLI_DEGC *
+ RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+ (int64_t)fab_slope;
+ offset2 += ((int64_t)MILLI * RR_ADC_TEMP_FS_VOLTAGE_NUM) / 2;
+ offset2 = div64_s64(
+ offset2, ((int64_t)MILLI * RR_ADC_TEMP_FS_VOLTAGE_NUM));
+
+ /*
+ * The -1 is to compensate for lost precision.
+ * It should actually be -0.7906976744186046.
+ * This works out to every value being off
+ * by about +0.091 degrees C after applying offset and scale.
+ */
+ *val = (int)(offset1 - offset2 - 1);
+ return IIO_VAL_INT;
+ case RR_ADC_DIE_TEMP:
+ offset1 = -RR_ADC_DIE_TEMP_OFFSET *
+ (int64_t)RR_ADC_TEMP_FS_VOLTAGE_DEN *
+ (int64_t)RR_ADC_CHAN_MSB;
+ offset1 = div64_s64(offset1, RR_ADC_TEMP_FS_VOLTAGE_NUM);
+
+ offset2 = -(int64_t)RR_ADC_CHG_TEMP_OFFSET_MILLI_DEGC *
+ RR_ADC_TEMP_FS_VOLTAGE_DEN * RR_ADC_CHAN_MSB *
+ RR_ADC_DIE_TEMP_SLOPE;
+ offset2 = div64_s64(offset2,
+ ((int64_t)RR_ADC_TEMP_FS_VOLTAGE_NUM));
+
+ /*
+ * The result is -339, it should be -338.69789, this results
+ * in the calculated die temp being off by
+ * -0.004 - -0.0175 degrees C
+ */
+ *val = (int)(offset1 - offset2);
+ return IIO_VAL_INT;
+ default:
+ break;
+ }
+ return -EINVAL;
+}
+
+static int rradc_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan_spec, int *val,
+ int *val2, long mask)
+{
+ struct rradc_chip *chip = iio_priv(indio_dev);
+ const struct rradc_channel *chan;
+ int ret;
+ u16 adc_code;
+
+ if (chan_spec->address >= RR_ADC_CHAN_MAX) {
+ dev_err(chip->dev, "Invalid channel index:%lu\n",
+ chan_spec->address);
+ return -EINVAL;
+ }
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ return rradc_read_scale(chip, chan_spec->address, val, val2);
+ case IIO_CHAN_INFO_OFFSET:
+ return rradc_read_offset(chip, chan_spec->address, val);
+ case IIO_CHAN_INFO_RAW:
+ ret = rradc_do_conversion(chip, chan_spec->address, &adc_code);
+ if (ret < 0)
+ return ret;
+
+ *val = adc_code;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_PROCESSED:
+ chan = &rradc_chans[chan_spec->address];
+ if (!chan->scale_fn)
+ return -EINVAL;
+ ret = rradc_do_conversion(chip, chan_spec->address, &adc_code);
+ if (ret < 0)
+ return ret;
+
+ *val = chan->scale_fn(chip, adc_code, val);
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int rradc_read_label(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, char *label)
+{
+ return snprintf(label, PAGE_SIZE, "%s\n",
+ rradc_chans[chan->address].label);
+}
+
+static const struct iio_info rradc_info = {
+ .read_raw = rradc_read_raw,
+ .read_label = rradc_read_label,
+};
+
+static const struct rradc_channel rradc_chans[RR_ADC_CHAN_MAX] = {
+ {
+ .label = "batt_id",
+ .scale_fn = rradc_post_process_batt_id,
+ .lsb = RR_ADC_BATT_ID_5_LSB,
+ .status = RR_ADC_BATT_ID_STS,
+ .size = 6,
+ .trigger_addr = RR_ADC_BATT_ID_TRIGGER,
+ .trigger_mask = BIT(0),
+ }, {
+ .label = "batt",
+ .lsb = RR_ADC_BATT_THERM_LSB,
+ .status = RR_ADC_BATT_THERM_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_BATT_THERM_TRIGGER,
+ }, {
+ .label = "pmi8998_skin",
+ .lsb = RR_ADC_SKIN_TEMP_LSB,
+ .status = RR_ADC_AUX_THERM_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_AUX_THERM_TRIGGER,
+ }, {
+ .label = "usbin_i",
+ .lsb = RR_ADC_USB_IN_I_LSB,
+ .status = RR_ADC_USB_IN_I_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_USB_IN_I_TRIGGER,
+ }, {
+ .label = "usbin_v",
+ .lsb = RR_ADC_USB_IN_V_LSB,
+ .status = RR_ADC_USB_IN_V_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_USB_IN_V_TRIGGER,
+ .trigger_mask = BIT(7),
+ }, {
+ .label = "dcin_i",
+ .lsb = RR_ADC_DC_IN_I_LSB,
+ .status = RR_ADC_DC_IN_I_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_DC_IN_I_TRIGGER,
+ }, {
+ .label = "dcin_v",
+ .lsb = RR_ADC_DC_IN_V_LSB,
+ .status = RR_ADC_DC_IN_V_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_DC_IN_V_TRIGGER,
+ }, {
+ .label = "pmi8998_die",
+ .lsb = RR_ADC_PMI_DIE_TEMP_LSB,
+ .status = RR_ADC_PMI_DIE_TEMP_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_PMI_DIE_TEMP_TRIGGER,
+ .trigger_mask = RR_ADC_TRIGGER_EVERY_CYCLE,
+ }, {
+ .label = "chg",
+ .lsb = RR_ADC_CHARGER_TEMP_LSB,
+ .status = RR_ADC_CHARGER_TEMP_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_CHARGER_TEMP_TRIGGER,
+ }, {
+ .label = "gpio",
+ .lsb = RR_ADC_GPIO_LSB,
+ .status = RR_ADC_GPIO_STS,
+ .size = 2,
+ .trigger_addr = RR_ADC_GPIO_TRIGGER,
+ },
+};
+
+static const struct iio_chan_spec rradc_iio_chans[RR_ADC_CHAN_MAX] = {
+ {
+ .type = IIO_RESISTANCE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .address = RR_ADC_BATT_ID,
+ .channel = 0,
+ .indexed = 1,
+ }, {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .address = RR_ADC_BATT_THERM,
+ .channel = 0,
+ .indexed = 1,
+ }, {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ .address = RR_ADC_SKIN_TEMP,
+ .channel = 1,
+ .indexed = 1,
+ }, {
+ .type = IIO_CURRENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = RR_ADC_USBIN_I,
+ .channel = 0,
+ .indexed = 1,
+ }, {
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = RR_ADC_USBIN_V,
+ .channel = 0,
+ .indexed = 1,
+ }, {
+ .type = IIO_CURRENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = RR_ADC_DCIN_I,
+ .channel = 1,
+ .indexed = 1,
+ }, {
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = RR_ADC_DCIN_V,
+ .channel = 1,
+ .indexed = 1,
+ }, {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ .address = RR_ADC_DIE_TEMP,
+ .channel = 2,
+ .indexed = 1,
+ }, {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = RR_ADC_CHG_TEMP,
+ .channel = 3,
+ .indexed = 1,
+ }, {
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .address = RR_ADC_GPIO,
+ .channel = 2,
+ .indexed = 1,
+ },
+};
+
+static int rradc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct iio_dev *indio_dev;
+ struct rradc_chip *chip;
+ int ret, i, batt_id_delay;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*chip));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ chip = iio_priv(indio_dev);
+ chip->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!chip->regmap) {
+ dev_err(dev, "Couldn't get parent's regmap\n");
+ return -EINVAL;
+ }
+
+ chip->dev = dev;
+ mutex_init(&chip->conversion_lock);
+
+ ret = device_property_read_u32(dev, "reg", &chip->base);
+ if (ret < 0) {
+ dev_err(chip->dev, "Couldn't find reg address, ret = %d\n",
+ ret);
+ return ret;
+ }
+
+ batt_id_delay = -1;
+ ret = device_property_read_u32(dev, "qcom,batt-id-delay-ms",
+ &batt_id_delay);
+ if (!ret) {
+ for (i = 0; i < RRADC_BATT_ID_DELAY_MAX; i++) {
+ if (batt_id_delay == batt_id_delays[i])
+ break;
+ }
+ if (i == RRADC_BATT_ID_DELAY_MAX)
+ batt_id_delay = -1;
+ }
+
+ if (batt_id_delay >= 0) {
+ batt_id_delay = FIELD_PREP(BATT_ID_SETTLE_MASK, batt_id_delay);
+ ret = regmap_update_bits(chip->regmap,
+ chip->base + RR_ADC_BATT_ID_CFG,
+ batt_id_delay, batt_id_delay);
+ if (ret < 0) {
+ dev_err(chip->dev,
+ "BATT_ID settling time config failed:%d\n",
+ ret);
+ }
+ }
+
+ /* Get the PMIC revision, we need it to handle some varying coefficients */
+ chip->pmic = qcom_pmic_get(chip->dev);
+ if (IS_ERR(chip->pmic)) {
+ dev_err(chip->dev, "Unable to get reference to PMIC device\n");
+ return PTR_ERR(chip->pmic);
+ }
+
+ switch (chip->pmic->subtype) {
+ case PMI8998_SUBTYPE:
+ indio_dev->name = "pmi8998-rradc";
+ break;
+ case PM660_SUBTYPE:
+ indio_dev->name = "pm660-rradc";
+ break;
+ default:
+ indio_dev->name = DRIVER_NAME;
+ break;
+ }
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &rradc_info;
+ indio_dev->channels = rradc_iio_chans;
+ indio_dev->num_channels = ARRAY_SIZE(rradc_iio_chans);
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct of_device_id rradc_match_table[] = {
+ { .compatible = "qcom,pm660-rradc" },
+ { .compatible = "qcom,pmi8998-rradc" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rradc_match_table);
+
+static struct platform_driver rradc_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = rradc_match_table,
+ },
+ .probe = rradc_probe,
+};
+module_platform_driver(rradc_driver);
+
+MODULE_DESCRIPTION("QCOM SPMI PMIC RR ADC driver");
+MODULE_AUTHOR("Caleb Connolly <caleb.connolly@xxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
--
2.35.1
