Den 02.08.2018 21.45, skrev Sam Ravnborg:
Add driver for the winstar wg160160 display.
The driver utilises pardata-dbi that
again utilise the pardata subsystem.
Signed-off-by: Sam Ravnborg <s...@ravnborg.org>
---
MAINTAINERS | 5 +
drivers/gpu/drm/tinydrm/Kconfig | 10 ++
drivers/gpu/drm/tinydrm/Makefile | 1 +
drivers/gpu/drm/tinydrm/wg160160.c | 298 +++++++++++++++++++++++++++++++++++++
4 files changed, 314 insertions(+)
create mode 100644 drivers/gpu/drm/tinydrm/wg160160.c
[...]
+
+/**
+ * write_reg - Write instruction on parallel bus to controller
+ *
+ * Check BUSY flag and write instruction
+ *
+ * @pdd: pardata data
+ * @reg: The register to write
+ * @value: The value of the register
+ *
+ * Returns:
+ * Zero on success, negative error code on failure
+ */
+int write_reg(struct pardata_data *pdd, unsigned int reg, unsigned int value)
+{
+ int ins[PIN_NUM];
+ int val[PIN_NUM];
+ int i;
+
+ for (i = 0; i < PIN_NUM; i++)
+ ins[PIN_DB0 + i] = !!BIT(reg);
+
+ for (i = 0; i < PIN_NUM; i++)
+ val[PIN_DB0 + i] = !!(value & BIT(i));
+
+ gpiod_set_value_cansleep(pdd->bus->pin_rs, 1);
+ gpiod_set_array_value_cansleep(PIN_NUM, pdd->bus->data_pins->desc, ins);
+ wait_busy(pdd);
+ pardata_strobe_write(pdd);
+
+ gpiod_set_value_cansleep(pdd->bus->pin_rs, 0);
+ gpiod_set_array_value_cansleep(PIN_NUM, pdd->bus->data_pins->desc, val);
+ wait_busy(pdd);
+ pardata_strobe_write(pdd);
+
+ return 0;
+}
If this controller has normal registers, you could do a regmap
implementation for pardata: drivers/base/regmap.
Noralf.
+
+/**
+ * write_buf - write buffer on parallel bus to controller
+ *
+ * @pdd: pardata data
+ * @offset: offset into display RAM
+ * @data: pointer to data to write
+ * @len: number of bytes to write
+ *
+ * Returns:
+ * Zero on success, negative error code on failure
+ */
+int write_buf(struct pardata_data *pdd, u8 offset, u8 *data, size_t len)
+{
+ int ins[PIN_NUM];
+ int val[PIN_NUM];
+ int bit;
+ int i;
+
+ /* Setup address */
+ write_reg(pdd, WG160160_ADDRSL_REG, offset & 0xff);
+ write_reg(pdd, WG160160_ADDRSL_REG, (offset >> 8) & 0xff);
+
+ /* prepare to write data */
+ for (i = 0; i < PIN_NUM; i++)
+ ins[PIN_DB0 + i] = !!(WG160160_WRITE_REG & BIT(i));
+
+ gpiod_set_value_cansleep(pdd->bus->pin_rs, 1);
+ gpiod_set_array_value_cansleep(PIN_NUM, pdd->bus->data_pins->desc, ins);
+ wait_busy(pdd);
+ pardata_strobe_write(pdd);
+
+ /* Write data byte - by byte */
+ gpiod_set_value_cansleep(pdd->bus->pin_rs, 0);
+
+ for (i = offset; i < (offset + len); i++) {
+ for (bit = 0; bit < PIN_NUM; bit++)
+ val[PIN_DB0 + bit] = !!(data[i] & BIT(bit));
+
+ gpiod_set_array_value_cansleep(PIN_NUM,
+ pdd->bus->data_pins->desc,
+ val);
+ wait_busy(pdd);
+ pardata_strobe_write(pdd);
+ }
+
+ return 0;
+}
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