| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (c) 2018, The Linux Foundation. All rights reserved. |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/delay.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/i2c.h> |
| #include <linux/media-bus-format.h> |
| #include <linux/regmap.h> |
| |
| #include <drm/drm_probe_helper.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_edid.h> |
| #include <drm/drm_mipi_dsi.h> |
| #include <drm/drm_of.h> |
| |
| #include <video/videomode.h> |
| |
| #define I2C_MAIN 0 |
| #define I2C_ADDR_MAIN 0x48 |
| |
| #define I2C_CEC_DSI 1 |
| #define I2C_ADDR_CEC_DSI 0x49 |
| |
| #define I2C_MAX_IDX 2 |
| |
| struct lt8912 { |
| struct device *dev; |
| struct drm_bridge bridge; |
| struct drm_connector connector; |
| |
| struct i2c_client *i2c_client[I2C_MAX_IDX]; |
| struct regmap *regmap[I2C_MAX_IDX]; |
| |
| struct device_node *host_node; |
| struct drm_bridge *hdmi_port; |
| |
| struct mipi_dsi_device *dsi; |
| |
| struct gpio_desc *gp_reset; |
| |
| struct videomode mode; |
| |
| u8 data_lanes; |
| bool is_power_on; |
| bool is_attached; |
| }; |
| |
| static int lt8912_write_init_config(struct lt8912 *lt) |
| { |
| const struct reg_sequence seq[] = { |
| /* Digital clock en*/ |
| {0x08, 0xff}, |
| {0x09, 0xff}, |
| {0x0a, 0xff}, |
| {0x0b, 0x7c}, |
| {0x0c, 0xff}, |
| {0x42, 0x04}, |
| |
| /*Tx Analog*/ |
| {0x31, 0xb1}, |
| {0x32, 0xb1}, |
| {0x33, 0x0e}, |
| {0x37, 0x00}, |
| {0x38, 0x22}, |
| {0x60, 0x82}, |
| |
| /*Cbus Analog*/ |
| {0x39, 0x45}, |
| {0x3a, 0x00}, |
| {0x3b, 0x00}, |
| |
| /*HDMI Pll Analog*/ |
| {0x44, 0x31}, |
| {0x55, 0x44}, |
| {0x57, 0x01}, |
| {0x5a, 0x02}, |
| |
| /*MIPI Analog*/ |
| {0x3e, 0xd6}, |
| {0x3f, 0xd4}, |
| {0x41, 0x3c}, |
| {0xB2, 0x00}, |
| }; |
| |
| return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); |
| } |
| |
| static int lt8912_write_mipi_basic_config(struct lt8912 *lt) |
| { |
| const struct reg_sequence seq[] = { |
| {0x12, 0x04}, |
| {0x14, 0x00}, |
| {0x15, 0x00}, |
| {0x1a, 0x03}, |
| {0x1b, 0x03}, |
| }; |
| |
| return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); |
| }; |
| |
| static int lt8912_write_dds_config(struct lt8912 *lt) |
| { |
| const struct reg_sequence seq[] = { |
| {0x4e, 0xff}, |
| {0x4f, 0x56}, |
| {0x50, 0x69}, |
| {0x51, 0x80}, |
| {0x1f, 0x5e}, |
| {0x20, 0x01}, |
| {0x21, 0x2c}, |
| {0x22, 0x01}, |
| {0x23, 0xfa}, |
| {0x24, 0x00}, |
| {0x25, 0xc8}, |
| {0x26, 0x00}, |
| {0x27, 0x5e}, |
| {0x28, 0x01}, |
| {0x29, 0x2c}, |
| {0x2a, 0x01}, |
| {0x2b, 0xfa}, |
| {0x2c, 0x00}, |
| {0x2d, 0xc8}, |
| {0x2e, 0x00}, |
| {0x42, 0x64}, |
| {0x43, 0x00}, |
| {0x44, 0x04}, |
| {0x45, 0x00}, |
| {0x46, 0x59}, |
| {0x47, 0x00}, |
| {0x48, 0xf2}, |
| {0x49, 0x06}, |
| {0x4a, 0x00}, |
| {0x4b, 0x72}, |
| {0x4c, 0x45}, |
| {0x4d, 0x00}, |
| {0x52, 0x08}, |
| {0x53, 0x00}, |
| {0x54, 0xb2}, |
| {0x55, 0x00}, |
| {0x56, 0xe4}, |
| {0x57, 0x0d}, |
| {0x58, 0x00}, |
| {0x59, 0xe4}, |
| {0x5a, 0x8a}, |
| {0x5b, 0x00}, |
| {0x5c, 0x34}, |
| {0x1e, 0x4f}, |
| {0x51, 0x00}, |
| }; |
| |
| return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq)); |
| } |
| |
| static int lt8912_write_rxlogicres_config(struct lt8912 *lt) |
| { |
| int ret; |
| |
| ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f); |
| usleep_range(10000, 20000); |
| ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff); |
| |
| return ret; |
| }; |
| |
| /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */ |
| static int lt8912_write_lvds_config(struct lt8912 *lt) |
| { |
| const struct reg_sequence seq[] = { |
| // lvds power up |
| {0x44, 0x30}, |
| {0x51, 0x05}, |
| |
| // core pll bypass |
| {0x50, 0x24}, // cp=50uA |
| {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL |
| {0x52, 0x04}, // loopdiv=0, use second-order PLL |
| {0x69, 0x0e}, // CP_PRESET_DIV_RATIO |
| {0x69, 0x8e}, |
| {0x6a, 0x00}, |
| {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8] |
| {0x6b, 0x51}, |
| |
| {0x04, 0xfb}, // core pll reset |
| {0x04, 0xff}, |
| |
| // scaler bypass |
| {0x7f, 0x00}, // disable scaler |
| {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA |
| |
| {0x02, 0xf7}, // lvds pll reset |
| {0x02, 0xff}, |
| {0x03, 0xcf}, |
| {0x03, 0xff}, |
| }; |
| |
| return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq)); |
| }; |
| |
| static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) |
| { |
| return container_of(b, struct lt8912, bridge); |
| } |
| |
| static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) |
| { |
| return container_of(c, struct lt8912, connector); |
| } |
| |
| static const struct regmap_config lt8912_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .max_register = 0xff, |
| }; |
| |
| static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client) |
| { |
| unsigned int i; |
| /* |
| * At this time we only initialize 2 chips, but the lt8912 provides |
| * a third interface for the audio over HDMI configuration. |
| */ |
| struct i2c_board_info info[] = { |
| { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), }, |
| { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), }, |
| }; |
| |
| if (!lt) |
| return -ENODEV; |
| |
| for (i = 0; i < ARRAY_SIZE(info); i++) { |
| if (i > 0) { |
| lt->i2c_client[i] = i2c_new_dummy_device(client->adapter, |
| info[i].addr); |
| if (IS_ERR(lt->i2c_client[i])) |
| return PTR_ERR(lt->i2c_client[i]); |
| } |
| |
| lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i], |
| <8912_regmap_config); |
| if (IS_ERR(lt->regmap[i])) |
| return PTR_ERR(lt->regmap[i]); |
| } |
| return 0; |
| } |
| |
| static int lt8912_free_i2c(struct lt8912 *lt) |
| { |
| unsigned int i; |
| |
| for (i = 1; i < I2C_MAX_IDX; i++) |
| i2c_unregister_device(lt->i2c_client[i]); |
| |
| return 0; |
| } |
| |
| static int lt8912_hard_power_on(struct lt8912 *lt) |
| { |
| gpiod_set_value_cansleep(lt->gp_reset, 0); |
| msleep(20); |
| |
| return 0; |
| } |
| |
| static void lt8912_hard_power_off(struct lt8912 *lt) |
| { |
| gpiod_set_value_cansleep(lt->gp_reset, 1); |
| msleep(20); |
| lt->is_power_on = false; |
| } |
| |
| static int lt8912_video_setup(struct lt8912 *lt) |
| { |
| u32 hactive, h_total, hpw, hfp, hbp; |
| u32 vactive, v_total, vpw, vfp, vbp; |
| u8 settle = 0x08; |
| int ret, hsync_activehigh, vsync_activehigh; |
| |
| if (!lt) |
| return -EINVAL; |
| |
| hactive = lt->mode.hactive; |
| hfp = lt->mode.hfront_porch; |
| hpw = lt->mode.hsync_len; |
| hbp = lt->mode.hback_porch; |
| h_total = hactive + hfp + hpw + hbp; |
| hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH; |
| |
| vactive = lt->mode.vactive; |
| vfp = lt->mode.vfront_porch; |
| vpw = lt->mode.vsync_len; |
| vbp = lt->mode.vback_porch; |
| v_total = vactive + vfp + vpw + vbp; |
| vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH; |
| |
| if (vactive <= 600) |
| settle = 0x04; |
| else if (vactive == 1080) |
| settle = 0x0a; |
| |
| ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8); |
| |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c); |
| |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8); |
| |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8); |
| |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8); |
| |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8); |
| |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8); |
| |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff); |
| ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8); |
| |
| ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0), |
| vsync_activehigh ? BIT(0) : 0); |
| ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1), |
| hsync_activehigh ? BIT(1) : 0); |
| ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0), |
| lt->connector.display_info.is_hdmi ? BIT(0) : 0); |
| |
| return ret; |
| } |
| |
| static int lt8912_soft_power_on(struct lt8912 *lt) |
| { |
| if (!lt->is_power_on) { |
| u32 lanes = lt->data_lanes; |
| |
| lt8912_write_init_config(lt); |
| regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3); |
| |
| lt8912_write_mipi_basic_config(lt); |
| |
| lt->is_power_on = true; |
| } |
| |
| return 0; |
| } |
| |
| static int lt8912_video_on(struct lt8912 *lt) |
| { |
| int ret; |
| |
| ret = lt8912_video_setup(lt); |
| if (ret < 0) |
| goto end; |
| |
| ret = lt8912_write_dds_config(lt); |
| if (ret < 0) |
| goto end; |
| |
| ret = lt8912_write_rxlogicres_config(lt); |
| if (ret < 0) |
| goto end; |
| |
| ret = lt8912_write_lvds_config(lt); |
| if (ret < 0) |
| goto end; |
| |
| end: |
| return ret; |
| } |
| |
| static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt) |
| { |
| int ret; |
| unsigned int reg_val; |
| |
| ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val); |
| if (ret) |
| return connector_status_unknown; |
| |
| if (reg_val & BIT(7)) |
| return connector_status_connected; |
| |
| return connector_status_disconnected; |
| } |
| |
| static enum drm_connector_status |
| lt8912_connector_detect(struct drm_connector *connector, bool force) |
| { |
| struct lt8912 *lt = connector_to_lt8912(connector); |
| |
| if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) |
| return drm_bridge_detect(lt->hdmi_port); |
| |
| return lt8912_check_cable_status(lt); |
| } |
| |
| static const struct drm_connector_funcs lt8912_connector_funcs = { |
| .detect = lt8912_connector_detect, |
| .fill_modes = drm_helper_probe_single_connector_modes, |
| .destroy = drm_connector_cleanup, |
| .reset = drm_atomic_helper_connector_reset, |
| .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
| .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
| }; |
| |
| static enum drm_mode_status |
| lt8912_connector_mode_valid(struct drm_connector *connector, |
| struct drm_display_mode *mode) |
| { |
| if (mode->clock > 150000) |
| return MODE_CLOCK_HIGH; |
| |
| if (mode->hdisplay > 1920) |
| return MODE_BAD_HVALUE; |
| |
| if (mode->vdisplay > 1080) |
| return MODE_BAD_VVALUE; |
| |
| return MODE_OK; |
| } |
| |
| static int lt8912_connector_get_modes(struct drm_connector *connector) |
| { |
| struct edid *edid; |
| int ret = -1; |
| int num = 0; |
| struct lt8912 *lt = connector_to_lt8912(connector); |
| u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; |
| |
| edid = drm_bridge_get_edid(lt->hdmi_port, connector); |
| if (edid) { |
| drm_connector_update_edid_property(connector, edid); |
| num = drm_add_edid_modes(connector, edid); |
| } else { |
| return ret; |
| } |
| |
| ret = drm_display_info_set_bus_formats(&connector->display_info, |
| &bus_format, 1); |
| if (ret) |
| num = ret; |
| |
| kfree(edid); |
| return num; |
| } |
| |
| static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { |
| .get_modes = lt8912_connector_get_modes, |
| .mode_valid = lt8912_connector_mode_valid, |
| }; |
| |
| static void lt8912_bridge_mode_set(struct drm_bridge *bridge, |
| const struct drm_display_mode *mode, |
| const struct drm_display_mode *adj) |
| { |
| struct lt8912 *lt = bridge_to_lt8912(bridge); |
| |
| drm_display_mode_to_videomode(adj, <->mode); |
| } |
| |
| static void lt8912_bridge_enable(struct drm_bridge *bridge) |
| { |
| struct lt8912 *lt = bridge_to_lt8912(bridge); |
| |
| lt8912_video_on(lt); |
| } |
| |
| static int lt8912_attach_dsi(struct lt8912 *lt) |
| { |
| struct device *dev = lt->dev; |
| struct mipi_dsi_host *host; |
| struct mipi_dsi_device *dsi; |
| int ret = -1; |
| const struct mipi_dsi_device_info info = { .type = "lt8912", |
| .channel = 0, |
| .node = NULL, |
| }; |
| |
| host = of_find_mipi_dsi_host_by_node(lt->host_node); |
| if (!host) { |
| dev_err(dev, "failed to find dsi host\n"); |
| return -EPROBE_DEFER; |
| } |
| |
| dsi = devm_mipi_dsi_device_register_full(dev, host, &info); |
| if (IS_ERR(dsi)) { |
| ret = PTR_ERR(dsi); |
| dev_err(dev, "failed to create dsi device (%d)\n", ret); |
| return ret; |
| } |
| |
| lt->dsi = dsi; |
| |
| dsi->lanes = lt->data_lanes; |
| dsi->format = MIPI_DSI_FMT_RGB888; |
| |
| dsi->mode_flags = MIPI_DSI_MODE_VIDEO | |
| MIPI_DSI_MODE_VIDEO_BURST | |
| MIPI_DSI_MODE_LPM | |
| MIPI_DSI_MODE_NO_EOT_PACKET; |
| |
| ret = devm_mipi_dsi_attach(dev, dsi); |
| if (ret < 0) { |
| dev_err(dev, "failed to attach dsi to host\n"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status) |
| { |
| struct lt8912 *lt = data; |
| |
| if (lt->bridge.dev) |
| drm_helper_hpd_irq_event(lt->bridge.dev); |
| } |
| |
| static int lt8912_bridge_connector_init(struct drm_bridge *bridge) |
| { |
| int ret; |
| struct lt8912 *lt = bridge_to_lt8912(bridge); |
| struct drm_connector *connector = <->connector; |
| |
| if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) { |
| drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt); |
| connector->polled = DRM_CONNECTOR_POLL_HPD; |
| } else { |
| connector->polled = DRM_CONNECTOR_POLL_CONNECT | |
| DRM_CONNECTOR_POLL_DISCONNECT; |
| } |
| |
| ret = drm_connector_init(bridge->dev, connector, |
| <8912_connector_funcs, |
| lt->hdmi_port->type); |
| if (ret) |
| goto exit; |
| |
| drm_connector_helper_add(connector, <8912_connector_helper_funcs); |
| |
| connector->dpms = DRM_MODE_DPMS_OFF; |
| drm_connector_attach_encoder(connector, bridge->encoder); |
| |
| exit: |
| return ret; |
| } |
| |
| static int lt8912_bridge_attach(struct drm_bridge *bridge, |
| enum drm_bridge_attach_flags flags) |
| { |
| struct lt8912 *lt = bridge_to_lt8912(bridge); |
| int ret; |
| |
| if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { |
| ret = lt8912_bridge_connector_init(bridge); |
| if (ret) { |
| dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret); |
| return ret; |
| } |
| } |
| |
| ret = lt8912_hard_power_on(lt); |
| if (ret) |
| return ret; |
| |
| ret = lt8912_soft_power_on(lt); |
| if (ret) |
| goto error; |
| |
| lt->is_attached = true; |
| |
| return 0; |
| |
| error: |
| lt8912_hard_power_off(lt); |
| return ret; |
| } |
| |
| static void lt8912_bridge_detach(struct drm_bridge *bridge) |
| { |
| struct lt8912 *lt = bridge_to_lt8912(bridge); |
| |
| if (lt->is_attached) { |
| lt8912_hard_power_off(lt); |
| |
| if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) |
| drm_bridge_hpd_disable(lt->hdmi_port); |
| |
| drm_connector_unregister(<->connector); |
| drm_connector_cleanup(<->connector); |
| } |
| } |
| |
| static enum drm_connector_status |
| lt8912_bridge_detect(struct drm_bridge *bridge) |
| { |
| struct lt8912 *lt = bridge_to_lt8912(bridge); |
| |
| if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) |
| return drm_bridge_detect(lt->hdmi_port); |
| |
| return lt8912_check_cable_status(lt); |
| } |
| |
| static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, |
| struct drm_connector *connector) |
| { |
| struct lt8912 *lt = bridge_to_lt8912(bridge); |
| |
| /* |
| * edid must be read through the ddc bus but it must be |
| * given to the hdmi connector node. |
| */ |
| if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) |
| return drm_bridge_get_edid(lt->hdmi_port, connector); |
| |
| dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n"); |
| return NULL; |
| } |
| |
| static const struct drm_bridge_funcs lt8912_bridge_funcs = { |
| .attach = lt8912_bridge_attach, |
| .detach = lt8912_bridge_detach, |
| .mode_set = lt8912_bridge_mode_set, |
| .enable = lt8912_bridge_enable, |
| .detect = lt8912_bridge_detect, |
| .get_edid = lt8912_bridge_get_edid, |
| }; |
| |
| static int lt8912_parse_dt(struct lt8912 *lt) |
| { |
| struct gpio_desc *gp_reset; |
| struct device *dev = lt->dev; |
| int ret; |
| int data_lanes; |
| struct device_node *port_node; |
| |
| gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); |
| if (IS_ERR(gp_reset)) { |
| ret = PTR_ERR(gp_reset); |
| if (ret != -EPROBE_DEFER) |
| dev_err(dev, "Failed to get reset gpio: %d\n", ret); |
| return ret; |
| } |
| lt->gp_reset = gp_reset; |
| |
| data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4); |
| if (data_lanes < 0) { |
| dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__); |
| return data_lanes; |
| } |
| |
| lt->data_lanes = data_lanes; |
| |
| lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1); |
| if (!lt->host_node) { |
| dev_err(lt->dev, "%s: Failed to get remote port\n", __func__); |
| return -ENODEV; |
| } |
| |
| port_node = of_graph_get_remote_node(dev->of_node, 1, -1); |
| if (!port_node) { |
| dev_err(lt->dev, "%s: Failed to get connector port\n", __func__); |
| ret = -ENODEV; |
| goto err_free_host_node; |
| } |
| |
| lt->hdmi_port = of_drm_find_bridge(port_node); |
| if (!lt->hdmi_port) { |
| dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); |
| ret = -ENODEV; |
| goto err_free_host_node; |
| } |
| |
| if (!of_device_is_compatible(port_node, "hdmi-connector")) { |
| dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__); |
| ret = -EINVAL; |
| goto err_free_host_node; |
| } |
| |
| of_node_put(port_node); |
| return 0; |
| |
| err_free_host_node: |
| of_node_put(port_node); |
| of_node_put(lt->host_node); |
| return ret; |
| } |
| |
| static int lt8912_put_dt(struct lt8912 *lt) |
| { |
| of_node_put(lt->host_node); |
| return 0; |
| } |
| |
| static int lt8912_probe(struct i2c_client *client) |
| { |
| static struct lt8912 *lt; |
| int ret = 0; |
| struct device *dev = &client->dev; |
| |
| lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL); |
| if (!lt) |
| return -ENOMEM; |
| |
| lt->dev = dev; |
| lt->i2c_client[0] = client; |
| |
| ret = lt8912_parse_dt(lt); |
| if (ret) |
| goto err_dt_parse; |
| |
| ret = lt8912_init_i2c(lt, client); |
| if (ret) |
| goto err_i2c; |
| |
| i2c_set_clientdata(client, lt); |
| |
| lt->bridge.funcs = <8912_bridge_funcs; |
| lt->bridge.of_node = dev->of_node; |
| lt->bridge.ops = (DRM_BRIDGE_OP_EDID | |
| DRM_BRIDGE_OP_DETECT); |
| |
| drm_bridge_add(<->bridge); |
| |
| ret = lt8912_attach_dsi(lt); |
| if (ret) |
| goto err_attach; |
| |
| return 0; |
| |
| err_attach: |
| drm_bridge_remove(<->bridge); |
| lt8912_free_i2c(lt); |
| err_i2c: |
| lt8912_put_dt(lt); |
| err_dt_parse: |
| return ret; |
| } |
| |
| static void lt8912_remove(struct i2c_client *client) |
| { |
| struct lt8912 *lt = i2c_get_clientdata(client); |
| |
| lt8912_bridge_detach(<->bridge); |
| drm_bridge_remove(<->bridge); |
| lt8912_free_i2c(lt); |
| lt8912_put_dt(lt); |
| } |
| |
| static const struct of_device_id lt8912_dt_match[] = { |
| {.compatible = "lontium,lt8912b"}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, lt8912_dt_match); |
| |
| static const struct i2c_device_id lt8912_id[] = { |
| {"lt8912", 0}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(i2c, lt8912_id); |
| |
| static struct i2c_driver lt8912_i2c_driver = { |
| .driver = { |
| .name = "lt8912", |
| .of_match_table = lt8912_dt_match, |
| }, |
| .probe_new = lt8912_probe, |
| .remove = lt8912_remove, |
| .id_table = lt8912_id, |
| }; |
| module_i2c_driver(lt8912_i2c_driver); |
| |
| MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>"); |
| MODULE_DESCRIPTION("lt8912 drm driver"); |
| MODULE_LICENSE("GPL v2"); |