#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
+#include <linux/regmap.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
-#define RPI_POE_ADC_REG 0x2
-#define RPI_POE_FLAG_REG 0x4
+#define RPI_POE_FW_BASE_REG 0x2
+
+#define RPI_POE_ADC_REG 0x0
+#define RPI_POE_FLAG_REG 0x2
#define RPI_POE_FLAG_AT BIT(0)
#define RPI_POE_FLAG_OC BIT(1)
#define DRVNAME "rpi-poe-power-supply"
struct rpi_poe_power_supply_ctx {
- struct power_supply *supply;
struct rpi_firmware *fw;
+
+ struct regmap *regmap;
+ u32 offset;
+
+ struct power_supply *supply;
};
struct fw_tag_data_s {
u32 ret;
};
-static int write_reg(struct rpi_firmware *fw, u32 reg, u32 *val)
+static int write_reg(struct rpi_poe_power_supply_ctx *ctx, u32 reg, u32 *val)
{
struct fw_tag_data_s fw_tag_data = {
- .reg = reg,
+ .reg = reg + RPI_POE_FW_BASE_REG,
.val = *val
};
int ret;
- ret = rpi_firmware_property(fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
- &fw_tag_data, sizeof(fw_tag_data));
- if (ret)
- return ret;
- else if (fw_tag_data.ret)
- return -EIO;
- return 0;
+ if (ctx->fw) {
+ ret = rpi_firmware_property(ctx->fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
+ &fw_tag_data, sizeof(fw_tag_data));
+ if (!ret && fw_tag_data.ret)
+ ret = -EIO;
+ } else {
+ ret = regmap_write(ctx->regmap, ctx->offset + reg, *val);
+ }
+
+ return ret;
}
-static int read_reg(struct rpi_firmware *fw, u32 reg, u32 *val)
+static int read_reg(struct rpi_poe_power_supply_ctx *ctx, u32 reg, u32 *val)
{
struct fw_tag_data_s fw_tag_data = {
- .reg = reg,
+ .reg = reg + RPI_POE_FW_BASE_REG,
.val = *val
};
+ u32 value;
int ret;
- ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_POE_HAT_VAL,
- &fw_tag_data, sizeof(fw_tag_data));
- if (ret)
- return ret;
- else if (fw_tag_data.ret)
- return -EIO;
+ if (ctx->fw) {
+ ret = rpi_firmware_property(ctx->fw, RPI_FIRMWARE_GET_POE_HAT_VAL,
+ &fw_tag_data, sizeof(fw_tag_data));
+ if (!ret && fw_tag_data.ret)
+ ret = -EIO;
+ *val = fw_tag_data.val;
+ } else {
+ ret = regmap_read(ctx->regmap, ctx->offset + reg, &value);
+ if (!ret) {
+ *val = value;
+ ret = regmap_read(ctx->regmap, ctx->offset + reg + 1, &value);
+ *val |= value << 8;
+ }
+ }
- *val = fw_tag_data.val;
- return 0;
+ return ret;
}
static int rpi_poe_power_supply_get_property(struct power_supply *psy,
switch (psp) {
case POWER_SUPPLY_PROP_HEALTH:
- ret = read_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
+ ret = read_reg(ctx, RPI_POE_FLAG_REG, &val);
if (ret)
return ret;
if (val & RPI_POE_FLAG_OC) {
r_val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
val = RPI_POE_FLAG_OC;
- ret = write_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
+ ret = write_reg(ctx, RPI_POE_FLAG_REG, &val);
if (ret)
return ret;
return 0;
return 0;
case POWER_SUPPLY_PROP_ONLINE:
- ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
+ ret = read_reg(ctx, RPI_POE_ADC_REG, &val);
if (ret)
return ret;
return 0;
case POWER_SUPPLY_PROP_CURRENT_NOW:
- ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
+ ret = read_reg(ctx, RPI_POE_ADC_REG, &val);
if (ret)
return ret;
val = (val * 3300)/9821;
return 0;
case POWER_SUPPLY_PROP_CURRENT_MAX:
- ret = read_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
+ ret = read_reg(ctx, RPI_POE_FLAG_REG, &val);
if (ret)
return ret;
- if (val & RPI_POE_FLAG_AT) {
+ if (val & RPI_POE_FLAG_AT)
r_val->intval = RPI_POE_CURRENT_AT_MAX;
- return 0;
- }
- r_val->intval = RPI_POE_CURRENT_AF_MAX;
+ else
+ r_val->intval = RPI_POE_CURRENT_AF_MAX;
return 0;
default:
if (!of_device_is_available(pdev->dev.of_node))
return -ENODEV;
- fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
- if (!fw_node) {
- dev_err(&pdev->dev, "Missing firmware node\n");
- return -ENOENT;
- }
-
ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
- ctx->fw = rpi_firmware_get(fw_node);
- if (!ctx->fw)
- return -EPROBE_DEFER;
- if (rpi_firmware_property(ctx->fw,
- RPI_FIRMWARE_GET_FIRMWARE_REVISION,
- &revision, sizeof(revision))) {
- dev_err(&pdev->dev, "Failed to get firmware revision\n");
- return -ENOENT;
- }
- if (revision < 0x60af72e8) {
- dev_err(&pdev->dev, "Unsupported firmware\n");
- return -ENOENT;
+ if (pdev->dev.parent)
+ ctx->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+
+ if (ctx->regmap) {
+ if (device_property_read_u32(&pdev->dev, "reg", &ctx->offset))
+ return -EINVAL;
+ } else {
+ fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
+ if (!fw_node) {
+ dev_err(&pdev->dev, "Missing firmware node\n");
+ return -ENOENT;
+ }
+
+ ctx->fw = rpi_firmware_get(fw_node);
+ if (!ctx->fw)
+ return -EPROBE_DEFER;
+ if (rpi_firmware_property(ctx->fw,
+ RPI_FIRMWARE_GET_FIRMWARE_REVISION,
+ &revision, sizeof(revision))) {
+ dev_err(&pdev->dev, "Failed to get firmware revision\n");
+ return -ENOENT;
+ }
+ if (revision < 0x60af72e8) {
+ dev_err(&pdev->dev, "Unsupported firmware\n");
+ return -ENOENT;
+ }
}
+
platform_set_drvdata(pdev, ctx);
psy_cfg.of_node = pdev->dev.of_node;