| /* |
| * MIPI DSI Bus |
| * |
| * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd. |
| * Andrzej Hajda <a.hajda@samsung.com> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sub license, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
| * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| * USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <drm/drm_mipi_dsi.h> |
| |
| #include <linux/device.h> |
| #include <linux/module.h> |
| #include <linux/of_device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/slab.h> |
| |
| #include <video/mipi_display.h> |
| |
| /** |
| * DOC: dsi helpers |
| * |
| * These functions contain some common logic and helpers to deal with MIPI DSI |
| * peripherals. |
| * |
| * Helpers are provided for a number of standard MIPI DSI command as well as a |
| * subset of the MIPI DCS command set. |
| */ |
| |
| static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv) |
| { |
| struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); |
| |
| /* attempt OF style match */ |
| if (of_driver_match_device(dev, drv)) |
| return 1; |
| |
| /* compare DSI device and driver names */ |
| if (!strcmp(dsi->name, drv->name)) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int mipi_dsi_uevent(struct device *dev, struct kobj_uevent_env *env) |
| { |
| struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); |
| int err; |
| |
| err = of_device_uevent_modalias(dev, env); |
| if (err != -ENODEV) |
| return err; |
| |
| add_uevent_var(env, "MODALIAS=%s%s", MIPI_DSI_MODULE_PREFIX, |
| dsi->name); |
| |
| return 0; |
| } |
| |
| static const struct dev_pm_ops mipi_dsi_device_pm_ops = { |
| .runtime_suspend = pm_generic_runtime_suspend, |
| .runtime_resume = pm_generic_runtime_resume, |
| .suspend = pm_generic_suspend, |
| .resume = pm_generic_resume, |
| .freeze = pm_generic_freeze, |
| .thaw = pm_generic_thaw, |
| .poweroff = pm_generic_poweroff, |
| .restore = pm_generic_restore, |
| }; |
| |
| static struct bus_type mipi_dsi_bus_type = { |
| .name = "mipi-dsi", |
| .match = mipi_dsi_device_match, |
| .uevent = mipi_dsi_uevent, |
| .pm = &mipi_dsi_device_pm_ops, |
| }; |
| |
| /** |
| * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a |
| * device tree node |
| * @np: device tree node |
| * |
| * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no |
| * such device exists (or has not been registered yet). |
| */ |
| struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np) |
| { |
| struct device *dev; |
| |
| dev = bus_find_device_by_of_node(&mipi_dsi_bus_type, np); |
| |
| return dev ? to_mipi_dsi_device(dev) : NULL; |
| } |
| EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node); |
| |
| static void mipi_dsi_dev_release(struct device *dev) |
| { |
| struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); |
| |
| of_node_put(dev->of_node); |
| kfree(dsi); |
| } |
| |
| static const struct device_type mipi_dsi_device_type = { |
| .release = mipi_dsi_dev_release, |
| }; |
| |
| static struct mipi_dsi_device *mipi_dsi_device_alloc(struct mipi_dsi_host *host) |
| { |
| struct mipi_dsi_device *dsi; |
| |
| dsi = kzalloc(sizeof(*dsi), GFP_KERNEL); |
| if (!dsi) |
| return ERR_PTR(-ENOMEM); |
| |
| dsi->host = host; |
| dsi->dev.bus = &mipi_dsi_bus_type; |
| dsi->dev.parent = host->dev; |
| dsi->dev.type = &mipi_dsi_device_type; |
| |
| device_initialize(&dsi->dev); |
| |
| return dsi; |
| } |
| |
| static int mipi_dsi_device_add(struct mipi_dsi_device *dsi) |
| { |
| struct mipi_dsi_host *host = dsi->host; |
| |
| dev_set_name(&dsi->dev, "%s.%d", dev_name(host->dev), dsi->channel); |
| |
| return device_add(&dsi->dev); |
| } |
| |
| #if IS_ENABLED(CONFIG_OF) |
| static struct mipi_dsi_device * |
| of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node) |
| { |
| struct device *dev = host->dev; |
| struct mipi_dsi_device_info info = { }; |
| int ret; |
| u32 reg; |
| |
| if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) { |
| dev_err(dev, "modalias failure on %pOF\n", node); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| ret = of_property_read_u32(node, "reg", ®); |
| if (ret) { |
| dev_err(dev, "device node %pOF has no valid reg property: %d\n", |
| node, ret); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| info.channel = reg; |
| info.node = of_node_get(node); |
| |
| return mipi_dsi_device_register_full(host, &info); |
| } |
| #else |
| static struct mipi_dsi_device * |
| of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node) |
| { |
| return ERR_PTR(-ENODEV); |
| } |
| #endif |
| |
| /** |
| * mipi_dsi_device_register_full - create a MIPI DSI device |
| * @host: DSI host to which this device is connected |
| * @info: pointer to template containing DSI device information |
| * |
| * Create a MIPI DSI device by using the device information provided by |
| * mipi_dsi_device_info template |
| * |
| * Returns: |
| * A pointer to the newly created MIPI DSI device, or, a pointer encoded |
| * with an error |
| */ |
| struct mipi_dsi_device * |
| mipi_dsi_device_register_full(struct mipi_dsi_host *host, |
| const struct mipi_dsi_device_info *info) |
| { |
| struct mipi_dsi_device *dsi; |
| struct device *dev = host->dev; |
| int ret; |
| |
| if (!info) { |
| dev_err(dev, "invalid mipi_dsi_device_info pointer\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| if (info->channel > 3) { |
| dev_err(dev, "invalid virtual channel: %u\n", info->channel); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| dsi = mipi_dsi_device_alloc(host); |
| if (IS_ERR(dsi)) { |
| dev_err(dev, "failed to allocate DSI device %ld\n", |
| PTR_ERR(dsi)); |
| return dsi; |
| } |
| |
| dsi->dev.of_node = info->node; |
| dsi->channel = info->channel; |
| strlcpy(dsi->name, info->type, sizeof(dsi->name)); |
| |
| ret = mipi_dsi_device_add(dsi); |
| if (ret) { |
| dev_err(dev, "failed to add DSI device %d\n", ret); |
| kfree(dsi); |
| return ERR_PTR(ret); |
| } |
| |
| return dsi; |
| } |
| EXPORT_SYMBOL(mipi_dsi_device_register_full); |
| |
| /** |
| * mipi_dsi_device_unregister - unregister MIPI DSI device |
| * @dsi: DSI peripheral device |
| */ |
| void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi) |
| { |
| device_unregister(&dsi->dev); |
| } |
| EXPORT_SYMBOL(mipi_dsi_device_unregister); |
| |
| static DEFINE_MUTEX(host_lock); |
| static LIST_HEAD(host_list); |
| |
| /** |
| * of_find_mipi_dsi_host_by_node() - find the MIPI DSI host matching a |
| * device tree node |
| * @node: device tree node |
| * |
| * Returns: |
| * A pointer to the MIPI DSI host corresponding to @node or NULL if no |
| * such device exists (or has not been registered yet). |
| */ |
| struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node) |
| { |
| struct mipi_dsi_host *host; |
| |
| mutex_lock(&host_lock); |
| |
| list_for_each_entry(host, &host_list, list) { |
| if (host->dev->of_node == node) { |
| mutex_unlock(&host_lock); |
| return host; |
| } |
| } |
| |
| mutex_unlock(&host_lock); |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node); |
| |
| int mipi_dsi_host_register(struct mipi_dsi_host *host) |
| { |
| struct device_node *node; |
| |
| for_each_available_child_of_node(host->dev->of_node, node) { |
| /* skip nodes without reg property */ |
| if (!of_find_property(node, "reg", NULL)) |
| continue; |
| of_mipi_dsi_device_add(host, node); |
| } |
| |
| mutex_lock(&host_lock); |
| list_add_tail(&host->list, &host_list); |
| mutex_unlock(&host_lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_host_register); |
| |
| static int mipi_dsi_remove_device_fn(struct device *dev, void *priv) |
| { |
| struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); |
| |
| mipi_dsi_device_unregister(dsi); |
| |
| return 0; |
| } |
| |
| void mipi_dsi_host_unregister(struct mipi_dsi_host *host) |
| { |
| device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn); |
| |
| mutex_lock(&host_lock); |
| list_del_init(&host->list); |
| mutex_unlock(&host_lock); |
| } |
| EXPORT_SYMBOL(mipi_dsi_host_unregister); |
| |
| /** |
| * mipi_dsi_attach - attach a DSI device to its DSI host |
| * @dsi: DSI peripheral |
| */ |
| int mipi_dsi_attach(struct mipi_dsi_device *dsi) |
| { |
| const struct mipi_dsi_host_ops *ops = dsi->host->ops; |
| |
| if (!ops || !ops->attach) |
| return -ENOSYS; |
| |
| return ops->attach(dsi->host, dsi); |
| } |
| EXPORT_SYMBOL(mipi_dsi_attach); |
| |
| /** |
| * mipi_dsi_detach - detach a DSI device from its DSI host |
| * @dsi: DSI peripheral |
| */ |
| int mipi_dsi_detach(struct mipi_dsi_device *dsi) |
| { |
| const struct mipi_dsi_host_ops *ops = dsi->host->ops; |
| |
| if (!ops || !ops->detach) |
| return -ENOSYS; |
| |
| return ops->detach(dsi->host, dsi); |
| } |
| EXPORT_SYMBOL(mipi_dsi_detach); |
| |
| static ssize_t mipi_dsi_device_transfer(struct mipi_dsi_device *dsi, |
| struct mipi_dsi_msg *msg) |
| { |
| const struct mipi_dsi_host_ops *ops = dsi->host->ops; |
| |
| if (!ops || !ops->transfer) |
| return -ENOSYS; |
| |
| if (dsi->mode_flags & MIPI_DSI_MODE_LPM) |
| msg->flags |= MIPI_DSI_MSG_USE_LPM; |
| |
| return ops->transfer(dsi->host, msg); |
| } |
| |
| /** |
| * mipi_dsi_packet_format_is_short - check if a packet is of the short format |
| * @type: MIPI DSI data type of the packet |
| * |
| * Return: true if the packet for the given data type is a short packet, false |
| * otherwise. |
| */ |
| bool mipi_dsi_packet_format_is_short(u8 type) |
| { |
| switch (type) { |
| case MIPI_DSI_V_SYNC_START: |
| case MIPI_DSI_V_SYNC_END: |
| case MIPI_DSI_H_SYNC_START: |
| case MIPI_DSI_H_SYNC_END: |
| case MIPI_DSI_END_OF_TRANSMISSION: |
| case MIPI_DSI_COLOR_MODE_OFF: |
| case MIPI_DSI_COLOR_MODE_ON: |
| case MIPI_DSI_SHUTDOWN_PERIPHERAL: |
| case MIPI_DSI_TURN_ON_PERIPHERAL: |
| case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM: |
| case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM: |
| case MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM: |
| case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM: |
| case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM: |
| case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM: |
| case MIPI_DSI_DCS_SHORT_WRITE: |
| case MIPI_DSI_DCS_SHORT_WRITE_PARAM: |
| case MIPI_DSI_DCS_READ: |
| case MIPI_DSI_DCS_COMPRESSION_MODE: |
| case MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE: |
| return true; |
| } |
| |
| return false; |
| } |
| EXPORT_SYMBOL(mipi_dsi_packet_format_is_short); |
| |
| /** |
| * mipi_dsi_packet_format_is_long - check if a packet is of the long format |
| * @type: MIPI DSI data type of the packet |
| * |
| * Return: true if the packet for the given data type is a long packet, false |
| * otherwise. |
| */ |
| bool mipi_dsi_packet_format_is_long(u8 type) |
| { |
| switch (type) { |
| case MIPI_DSI_PPS_LONG_WRITE: |
| case MIPI_DSI_NULL_PACKET: |
| case MIPI_DSI_BLANKING_PACKET: |
| case MIPI_DSI_GENERIC_LONG_WRITE: |
| case MIPI_DSI_DCS_LONG_WRITE: |
| case MIPI_DSI_LOOSELY_PACKED_PIXEL_STREAM_YCBCR20: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR24: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_30: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_36: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_16: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_18: |
| case MIPI_DSI_PIXEL_STREAM_3BYTE_18: |
| case MIPI_DSI_PACKED_PIXEL_STREAM_24: |
| return true; |
| } |
| |
| return false; |
| } |
| EXPORT_SYMBOL(mipi_dsi_packet_format_is_long); |
| |
| /** |
| * mipi_dsi_create_packet - create a packet from a message according to the |
| * DSI protocol |
| * @packet: pointer to a DSI packet structure |
| * @msg: message to translate into a packet |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_create_packet(struct mipi_dsi_packet *packet, |
| const struct mipi_dsi_msg *msg) |
| { |
| if (!packet || !msg) |
| return -EINVAL; |
| |
| /* do some minimum sanity checking */ |
| if (!mipi_dsi_packet_format_is_short(msg->type) && |
| !mipi_dsi_packet_format_is_long(msg->type)) |
| return -EINVAL; |
| |
| if (msg->channel > 3) |
| return -EINVAL; |
| |
| memset(packet, 0, sizeof(*packet)); |
| packet->header[0] = ((msg->channel & 0x3) << 6) | (msg->type & 0x3f); |
| |
| /* TODO: compute ECC if hardware support is not available */ |
| |
| /* |
| * Long write packets contain the word count in header bytes 1 and 2. |
| * The payload follows the header and is word count bytes long. |
| * |
| * Short write packets encode up to two parameters in header bytes 1 |
| * and 2. |
| */ |
| if (mipi_dsi_packet_format_is_long(msg->type)) { |
| packet->header[1] = (msg->tx_len >> 0) & 0xff; |
| packet->header[2] = (msg->tx_len >> 8) & 0xff; |
| |
| packet->payload_length = msg->tx_len; |
| packet->payload = msg->tx_buf; |
| } else { |
| const u8 *tx = msg->tx_buf; |
| |
| packet->header[1] = (msg->tx_len > 0) ? tx[0] : 0; |
| packet->header[2] = (msg->tx_len > 1) ? tx[1] : 0; |
| } |
| |
| packet->size = sizeof(packet->header) + packet->payload_length; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_create_packet); |
| |
| /** |
| * mipi_dsi_shutdown_peripheral() - sends a Shutdown Peripheral command |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi) |
| { |
| struct mipi_dsi_msg msg = { |
| .channel = dsi->channel, |
| .type = MIPI_DSI_SHUTDOWN_PERIPHERAL, |
| .tx_buf = (u8 [2]) { 0, 0 }, |
| .tx_len = 2, |
| }; |
| int ret = mipi_dsi_device_transfer(dsi, &msg); |
| |
| return (ret < 0) ? ret : 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_shutdown_peripheral); |
| |
| /** |
| * mipi_dsi_turn_on_peripheral() - sends a Turn On Peripheral command |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi) |
| { |
| struct mipi_dsi_msg msg = { |
| .channel = dsi->channel, |
| .type = MIPI_DSI_TURN_ON_PERIPHERAL, |
| .tx_buf = (u8 [2]) { 0, 0 }, |
| .tx_len = 2, |
| }; |
| int ret = mipi_dsi_device_transfer(dsi, &msg); |
| |
| return (ret < 0) ? ret : 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_turn_on_peripheral); |
| |
| /* |
| * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the |
| * the payload in a long packet transmitted from the peripheral back to the |
| * host processor |
| * @dsi: DSI peripheral device |
| * @value: the maximum size of the payload |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, |
| u16 value) |
| { |
| u8 tx[2] = { value & 0xff, value >> 8 }; |
| struct mipi_dsi_msg msg = { |
| .channel = dsi->channel, |
| .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE, |
| .tx_len = sizeof(tx), |
| .tx_buf = tx, |
| }; |
| int ret = mipi_dsi_device_transfer(dsi, &msg); |
| |
| return (ret < 0) ? ret : 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size); |
| |
| /** |
| * mipi_dsi_generic_write() - transmit data using a generic write packet |
| * @dsi: DSI peripheral device |
| * @payload: buffer containing the payload |
| * @size: size of payload buffer |
| * |
| * This function will automatically choose the right data type depending on |
| * the payload length. |
| * |
| * Return: The number of bytes transmitted on success or a negative error code |
| * on failure. |
| */ |
| ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload, |
| size_t size) |
| { |
| struct mipi_dsi_msg msg = { |
| .channel = dsi->channel, |
| .tx_buf = payload, |
| .tx_len = size |
| }; |
| |
| switch (size) { |
| case 0: |
| msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM; |
| break; |
| |
| case 1: |
| msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM; |
| break; |
| |
| case 2: |
| msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM; |
| break; |
| |
| default: |
| msg.type = MIPI_DSI_GENERIC_LONG_WRITE; |
| break; |
| } |
| |
| return mipi_dsi_device_transfer(dsi, &msg); |
| } |
| EXPORT_SYMBOL(mipi_dsi_generic_write); |
| |
| /** |
| * mipi_dsi_generic_read() - receive data using a generic read packet |
| * @dsi: DSI peripheral device |
| * @params: buffer containing the request parameters |
| * @num_params: number of request parameters |
| * @data: buffer in which to return the received data |
| * @size: size of receive buffer |
| * |
| * This function will automatically choose the right data type depending on |
| * the number of parameters passed in. |
| * |
| * Return: The number of bytes successfully read or a negative error code on |
| * failure. |
| */ |
| ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params, |
| size_t num_params, void *data, size_t size) |
| { |
| struct mipi_dsi_msg msg = { |
| .channel = dsi->channel, |
| .tx_len = num_params, |
| .tx_buf = params, |
| .rx_len = size, |
| .rx_buf = data |
| }; |
| |
| switch (num_params) { |
| case 0: |
| msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM; |
| break; |
| |
| case 1: |
| msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM; |
| break; |
| |
| case 2: |
| msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM; |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return mipi_dsi_device_transfer(dsi, &msg); |
| } |
| EXPORT_SYMBOL(mipi_dsi_generic_read); |
| |
| /** |
| * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload |
| * @dsi: DSI peripheral device |
| * @data: buffer containing data to be transmitted |
| * @len: size of transmission buffer |
| * |
| * This function will automatically choose the right data type depending on |
| * the command payload length. |
| * |
| * Return: The number of bytes successfully transmitted or a negative error |
| * code on failure. |
| */ |
| ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, |
| const void *data, size_t len) |
| { |
| struct mipi_dsi_msg msg = { |
| .channel = dsi->channel, |
| .tx_buf = data, |
| .tx_len = len |
| }; |
| |
| switch (len) { |
| case 0: |
| return -EINVAL; |
| |
| case 1: |
| msg.type = MIPI_DSI_DCS_SHORT_WRITE; |
| break; |
| |
| case 2: |
| msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM; |
| break; |
| |
| default: |
| msg.type = MIPI_DSI_DCS_LONG_WRITE; |
| break; |
| } |
| |
| return mipi_dsi_device_transfer(dsi, &msg); |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer); |
| |
| /** |
| * mipi_dsi_dcs_write() - send DCS write command |
| * @dsi: DSI peripheral device |
| * @cmd: DCS command |
| * @data: buffer containing the command payload |
| * @len: command payload length |
| * |
| * This function will automatically choose the right data type depending on |
| * the command payload length. |
| * |
| * Return: The number of bytes successfully transmitted or a negative error |
| * code on failure. |
| */ |
| ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, |
| const void *data, size_t len) |
| { |
| ssize_t err; |
| size_t size; |
| u8 *tx; |
| |
| if (len > 0) { |
| size = 1 + len; |
| |
| tx = kmalloc(size, GFP_KERNEL); |
| if (!tx) |
| return -ENOMEM; |
| |
| /* concatenate the DCS command byte and the payload */ |
| tx[0] = cmd; |
| memcpy(&tx[1], data, len); |
| } else { |
| tx = &cmd; |
| size = 1; |
| } |
| |
| err = mipi_dsi_dcs_write_buffer(dsi, tx, size); |
| |
| if (len > 0) |
| kfree(tx); |
| |
| return err; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_write); |
| |
| /** |
| * mipi_dsi_dcs_read() - send DCS read request command |
| * @dsi: DSI peripheral device |
| * @cmd: DCS command |
| * @data: buffer in which to receive data |
| * @len: size of receive buffer |
| * |
| * Return: The number of bytes read or a negative error code on failure. |
| */ |
| ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, |
| size_t len) |
| { |
| struct mipi_dsi_msg msg = { |
| .channel = dsi->channel, |
| .type = MIPI_DSI_DCS_READ, |
| .tx_buf = &cmd, |
| .tx_len = 1, |
| .rx_buf = data, |
| .rx_len = len |
| }; |
| |
| return mipi_dsi_device_transfer(dsi, &msg); |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_read); |
| |
| /** |
| * mipi_dsi_dcs_nop() - send DCS nop packet |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_NOP, NULL, 0); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_nop); |
| |
| /** |
| * mipi_dsi_dcs_soft_reset() - perform a software reset of the display module |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SOFT_RESET, NULL, 0); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_soft_reset); |
| |
| /** |
| * mipi_dsi_dcs_get_power_mode() - query the display module's current power |
| * mode |
| * @dsi: DSI peripheral device |
| * @mode: return location for the current power mode |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_POWER_MODE, mode, |
| sizeof(*mode)); |
| if (err <= 0) { |
| if (err == 0) |
| err = -ENODATA; |
| |
| return err; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_get_power_mode); |
| |
| /** |
| * mipi_dsi_dcs_get_pixel_format() - gets the pixel format for the RGB image |
| * data used by the interface |
| * @dsi: DSI peripheral device |
| * @format: return location for the pixel format |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_PIXEL_FORMAT, format, |
| sizeof(*format)); |
| if (err <= 0) { |
| if (err == 0) |
| err = -ENODATA; |
| |
| return err; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_get_pixel_format); |
| |
| /** |
| * mipi_dsi_dcs_enter_sleep_mode() - disable all unnecessary blocks inside the |
| * display module except interface communication |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_enter_sleep_mode); |
| |
| /** |
| * mipi_dsi_dcs_exit_sleep_mode() - enable all blocks inside the display |
| * module |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_EXIT_SLEEP_MODE, NULL, 0); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_exit_sleep_mode); |
| |
| /** |
| * mipi_dsi_dcs_set_display_off() - stop displaying the image data on the |
| * display device |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_display_off); |
| |
| /** |
| * mipi_dsi_dcs_set_display_on() - start displaying the image data on the |
| * display device |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure |
| */ |
| int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_ON, NULL, 0); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_display_on); |
| |
| /** |
| * mipi_dsi_dcs_set_column_address() - define the column extent of the frame |
| * memory accessed by the host processor |
| * @dsi: DSI peripheral device |
| * @start: first column of frame memory |
| * @end: last column of frame memory |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start, |
| u16 end) |
| { |
| u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff }; |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_COLUMN_ADDRESS, payload, |
| sizeof(payload)); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_column_address); |
| |
| /** |
| * mipi_dsi_dcs_set_page_address() - define the page extent of the frame |
| * memory accessed by the host processor |
| * @dsi: DSI peripheral device |
| * @start: first page of frame memory |
| * @end: last page of frame memory |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start, |
| u16 end) |
| { |
| u8 payload[4] = { start >> 8, start & 0xff, end >> 8, end & 0xff }; |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PAGE_ADDRESS, payload, |
| sizeof(payload)); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_page_address); |
| |
| /** |
| * mipi_dsi_dcs_set_tear_off() - turn off the display module's Tearing Effect |
| * output signal on the TE signal line |
| * @dsi: DSI peripheral device |
| * |
| * Return: 0 on success or a negative error code on failure |
| */ |
| int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_OFF, NULL, 0); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_off); |
| |
| /** |
| * mipi_dsi_dcs_set_tear_on() - turn on the display module's Tearing Effect |
| * output signal on the TE signal line. |
| * @dsi: DSI peripheral device |
| * @mode: the Tearing Effect Output Line mode |
| * |
| * Return: 0 on success or a negative error code on failure |
| */ |
| int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi, |
| enum mipi_dsi_dcs_tear_mode mode) |
| { |
| u8 value = mode; |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_ON, &value, |
| sizeof(value)); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_on); |
| |
| /** |
| * mipi_dsi_dcs_set_pixel_format() - sets the pixel format for the RGB image |
| * data used by the interface |
| * @dsi: DSI peripheral device |
| * @format: pixel format |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_PIXEL_FORMAT, &format, |
| sizeof(format)); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_pixel_format); |
| |
| /** |
| * mipi_dsi_dcs_set_tear_scanline() - set the scanline to use as trigger for |
| * the Tearing Effect output signal of the display module |
| * @dsi: DSI peripheral device |
| * @scanline: scanline to use as trigger |
| * |
| * Return: 0 on success or a negative error code on failure |
| */ |
| int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline) |
| { |
| u8 payload[2] = { scanline >> 8, scanline & 0xff }; |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_TEAR_SCANLINE, payload, |
| sizeof(payload)); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_tear_scanline); |
| |
| /** |
| * mipi_dsi_dcs_set_display_brightness() - sets the brightness value of the |
| * display |
| * @dsi: DSI peripheral device |
| * @brightness: brightness value |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi, |
| u16 brightness) |
| { |
| u8 payload[2] = { brightness & 0xff, brightness >> 8 }; |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_write(dsi, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, |
| payload, sizeof(payload)); |
| if (err < 0) |
| return err; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_set_display_brightness); |
| |
| /** |
| * mipi_dsi_dcs_get_display_brightness() - gets the current brightness value |
| * of the display |
| * @dsi: DSI peripheral device |
| * @brightness: brightness value |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, |
| u16 *brightness) |
| { |
| ssize_t err; |
| |
| err = mipi_dsi_dcs_read(dsi, MIPI_DCS_GET_DISPLAY_BRIGHTNESS, |
| brightness, sizeof(*brightness)); |
| if (err <= 0) { |
| if (err == 0) |
| err = -ENODATA; |
| |
| return err; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mipi_dsi_dcs_get_display_brightness); |
| |
| static int mipi_dsi_drv_probe(struct device *dev) |
| { |
| struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); |
| struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); |
| |
| return drv->probe(dsi); |
| } |
| |
| static int mipi_dsi_drv_remove(struct device *dev) |
| { |
| struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); |
| struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); |
| |
| return drv->remove(dsi); |
| } |
| |
| static void mipi_dsi_drv_shutdown(struct device *dev) |
| { |
| struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); |
| struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); |
| |
| drv->shutdown(dsi); |
| } |
| |
| /** |
| * mipi_dsi_driver_register_full() - register a driver for DSI devices |
| * @drv: DSI driver structure |
| * @owner: owner module |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| int mipi_dsi_driver_register_full(struct mipi_dsi_driver *drv, |
| struct module *owner) |
| { |
| drv->driver.bus = &mipi_dsi_bus_type; |
| drv->driver.owner = owner; |
| |
| if (drv->probe) |
| drv->driver.probe = mipi_dsi_drv_probe; |
| if (drv->remove) |
| drv->driver.remove = mipi_dsi_drv_remove; |
| if (drv->shutdown) |
| drv->driver.shutdown = mipi_dsi_drv_shutdown; |
| |
| return driver_register(&drv->driver); |
| } |
| EXPORT_SYMBOL(mipi_dsi_driver_register_full); |
| |
| /** |
| * mipi_dsi_driver_unregister() - unregister a driver for DSI devices |
| * @drv: DSI driver structure |
| * |
| * Return: 0 on success or a negative error code on failure. |
| */ |
| void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv) |
| { |
| driver_unregister(&drv->driver); |
| } |
| EXPORT_SYMBOL(mipi_dsi_driver_unregister); |
| |
| static int __init mipi_dsi_bus_init(void) |
| { |
| return bus_register(&mipi_dsi_bus_type); |
| } |
| postcore_initcall(mipi_dsi_bus_init); |
| |
| MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>"); |
| MODULE_DESCRIPTION("MIPI DSI Bus"); |
| MODULE_LICENSE("GPL and additional rights"); |