Tomi Valkeinen | 04f0ff0 | 2013-05-24 14:21:56 +0300 | [diff] [blame^] | 1 | /* |
| 2 | * Generic MIPI DPI Panel Driver |
| 3 | * |
| 4 | * Copyright (C) 2013 Texas Instruments |
| 5 | * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as published by |
| 9 | * the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/gpio.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/slab.h> |
| 16 | |
| 17 | #include <video/omapdss.h> |
| 18 | #include <video/omap-panel-data.h> |
| 19 | |
| 20 | struct panel_drv_data { |
| 21 | struct omap_dss_device dssdev; |
| 22 | struct omap_dss_device *in; |
| 23 | |
| 24 | int data_lines; |
| 25 | |
| 26 | struct omap_video_timings videomode; |
| 27 | |
| 28 | int backlight_gpio; |
| 29 | int enable_gpio; |
| 30 | }; |
| 31 | |
| 32 | #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) |
| 33 | |
| 34 | static int panel_dpi_connect(struct omap_dss_device *dssdev) |
| 35 | { |
| 36 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 37 | struct omap_dss_device *in = ddata->in; |
| 38 | int r; |
| 39 | |
| 40 | if (omapdss_device_is_connected(dssdev)) |
| 41 | return 0; |
| 42 | |
| 43 | r = in->ops.dpi->connect(in, dssdev); |
| 44 | if (r) |
| 45 | return r; |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static void panel_dpi_disconnect(struct omap_dss_device *dssdev) |
| 51 | { |
| 52 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 53 | struct omap_dss_device *in = ddata->in; |
| 54 | |
| 55 | if (!omapdss_device_is_connected(dssdev)) |
| 56 | return; |
| 57 | |
| 58 | in->ops.dpi->disconnect(in, dssdev); |
| 59 | } |
| 60 | |
| 61 | static int panel_dpi_enable(struct omap_dss_device *dssdev) |
| 62 | { |
| 63 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 64 | struct omap_dss_device *in = ddata->in; |
| 65 | int r; |
| 66 | |
| 67 | if (!omapdss_device_is_connected(dssdev)) |
| 68 | return -ENODEV; |
| 69 | |
| 70 | if (omapdss_device_is_enabled(dssdev)) |
| 71 | return 0; |
| 72 | |
| 73 | in->ops.dpi->set_data_lines(in, ddata->data_lines); |
| 74 | in->ops.dpi->set_timings(in, &ddata->videomode); |
| 75 | |
| 76 | r = in->ops.dpi->enable(in); |
| 77 | if (r) |
| 78 | return r; |
| 79 | |
| 80 | if (gpio_is_valid(ddata->enable_gpio)) |
| 81 | gpio_set_value_cansleep(ddata->enable_gpio, 1); |
| 82 | |
| 83 | if (gpio_is_valid(ddata->backlight_gpio)) |
| 84 | gpio_set_value_cansleep(ddata->backlight_gpio, 1); |
| 85 | |
| 86 | dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static void panel_dpi_disable(struct omap_dss_device *dssdev) |
| 92 | { |
| 93 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 94 | struct omap_dss_device *in = ddata->in; |
| 95 | |
| 96 | if (!omapdss_device_is_enabled(dssdev)) |
| 97 | return; |
| 98 | |
| 99 | if (gpio_is_valid(ddata->enable_gpio)) |
| 100 | gpio_set_value_cansleep(ddata->enable_gpio, 0); |
| 101 | |
| 102 | if (gpio_is_valid(ddata->backlight_gpio)) |
| 103 | gpio_set_value_cansleep(ddata->backlight_gpio, 0); |
| 104 | |
| 105 | in->ops.dpi->disable(in); |
| 106 | |
| 107 | dssdev->state = OMAP_DSS_DISPLAY_DISABLED; |
| 108 | } |
| 109 | |
| 110 | static void panel_dpi_set_timings(struct omap_dss_device *dssdev, |
| 111 | struct omap_video_timings *timings) |
| 112 | { |
| 113 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 114 | struct omap_dss_device *in = ddata->in; |
| 115 | |
| 116 | ddata->videomode = *timings; |
| 117 | dssdev->panel.timings = *timings; |
| 118 | |
| 119 | in->ops.dpi->set_timings(in, timings); |
| 120 | } |
| 121 | |
| 122 | static void panel_dpi_get_timings(struct omap_dss_device *dssdev, |
| 123 | struct omap_video_timings *timings) |
| 124 | { |
| 125 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 126 | |
| 127 | *timings = ddata->videomode; |
| 128 | } |
| 129 | |
| 130 | static int panel_dpi_check_timings(struct omap_dss_device *dssdev, |
| 131 | struct omap_video_timings *timings) |
| 132 | { |
| 133 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 134 | struct omap_dss_device *in = ddata->in; |
| 135 | |
| 136 | return in->ops.dpi->check_timings(in, timings); |
| 137 | } |
| 138 | |
| 139 | static struct omap_dss_driver panel_dpi_ops = { |
| 140 | .connect = panel_dpi_connect, |
| 141 | .disconnect = panel_dpi_disconnect, |
| 142 | |
| 143 | .enable = panel_dpi_enable, |
| 144 | .disable = panel_dpi_disable, |
| 145 | |
| 146 | .set_timings = panel_dpi_set_timings, |
| 147 | .get_timings = panel_dpi_get_timings, |
| 148 | .check_timings = panel_dpi_check_timings, |
| 149 | |
| 150 | .get_resolution = omapdss_default_get_resolution, |
| 151 | }; |
| 152 | |
| 153 | static int panel_dpi_probe_pdata(struct platform_device *pdev) |
| 154 | { |
| 155 | const struct panel_dpi_platform_data *pdata; |
| 156 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); |
| 157 | struct omap_dss_device *dssdev, *in; |
| 158 | struct videomode vm; |
| 159 | |
| 160 | pdata = dev_get_platdata(&pdev->dev); |
| 161 | |
| 162 | in = omap_dss_find_output(pdata->source); |
| 163 | if (in == NULL) { |
| 164 | dev_err(&pdev->dev, "failed to find video source '%s'\n", |
| 165 | pdata->source); |
| 166 | return -EPROBE_DEFER; |
| 167 | } |
| 168 | |
| 169 | ddata->in = in; |
| 170 | |
| 171 | ddata->data_lines = pdata->data_lines; |
| 172 | |
| 173 | videomode_from_timing(pdata->display_timing, &vm); |
| 174 | videomode_to_omap_video_timings(&vm, &ddata->videomode); |
| 175 | |
| 176 | dssdev = &ddata->dssdev; |
| 177 | dssdev->name = pdata->name; |
| 178 | |
| 179 | ddata->enable_gpio = pdata->enable_gpio; |
| 180 | ddata->backlight_gpio = pdata->backlight_gpio; |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static int panel_dpi_probe(struct platform_device *pdev) |
| 186 | { |
| 187 | struct panel_drv_data *ddata; |
| 188 | struct omap_dss_device *dssdev; |
| 189 | int r; |
| 190 | |
| 191 | ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); |
| 192 | if (ddata == NULL) |
| 193 | return -ENOMEM; |
| 194 | |
| 195 | platform_set_drvdata(pdev, ddata); |
| 196 | |
| 197 | if (dev_get_platdata(&pdev->dev)) { |
| 198 | r = panel_dpi_probe_pdata(pdev); |
| 199 | if (r) |
| 200 | return r; |
| 201 | } else { |
| 202 | return -ENODEV; |
| 203 | } |
| 204 | |
| 205 | if (gpio_is_valid(ddata->enable_gpio)) { |
| 206 | r = devm_gpio_request_one(&pdev->dev, ddata->enable_gpio, |
| 207 | GPIOF_OUT_INIT_LOW, "panel enable"); |
| 208 | if (r) |
| 209 | goto err_gpio; |
| 210 | } |
| 211 | |
| 212 | if (gpio_is_valid(ddata->backlight_gpio)) { |
| 213 | r = devm_gpio_request_one(&pdev->dev, ddata->backlight_gpio, |
| 214 | GPIOF_OUT_INIT_LOW, "panel backlight"); |
| 215 | if (r) |
| 216 | goto err_gpio; |
| 217 | } |
| 218 | |
| 219 | dssdev = &ddata->dssdev; |
| 220 | dssdev->dev = &pdev->dev; |
| 221 | dssdev->driver = &panel_dpi_ops; |
| 222 | dssdev->type = OMAP_DISPLAY_TYPE_DPI; |
| 223 | dssdev->owner = THIS_MODULE; |
| 224 | dssdev->panel.timings = ddata->videomode; |
| 225 | dssdev->phy.dpi.data_lines = ddata->data_lines; |
| 226 | |
| 227 | r = omapdss_register_display(dssdev); |
| 228 | if (r) { |
| 229 | dev_err(&pdev->dev, "Failed to register panel\n"); |
| 230 | goto err_reg; |
| 231 | } |
| 232 | |
| 233 | return 0; |
| 234 | |
| 235 | err_reg: |
| 236 | err_gpio: |
| 237 | omap_dss_put_device(ddata->in); |
| 238 | return r; |
| 239 | } |
| 240 | |
| 241 | static int __exit panel_dpi_remove(struct platform_device *pdev) |
| 242 | { |
| 243 | struct panel_drv_data *ddata = platform_get_drvdata(pdev); |
| 244 | struct omap_dss_device *dssdev = &ddata->dssdev; |
| 245 | struct omap_dss_device *in = ddata->in; |
| 246 | |
| 247 | omapdss_unregister_display(dssdev); |
| 248 | |
| 249 | panel_dpi_disable(dssdev); |
| 250 | panel_dpi_disconnect(dssdev); |
| 251 | |
| 252 | omap_dss_put_device(in); |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static struct platform_driver panel_dpi_driver = { |
| 258 | .probe = panel_dpi_probe, |
| 259 | .remove = __exit_p(panel_dpi_remove), |
| 260 | .driver = { |
| 261 | .name = "panel-dpi", |
| 262 | .owner = THIS_MODULE, |
| 263 | }, |
| 264 | }; |
| 265 | |
| 266 | module_platform_driver(panel_dpi_driver); |
| 267 | |
| 268 | MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); |
| 269 | MODULE_DESCRIPTION("Generic MIPI DPI Panel Driver"); |
| 270 | MODULE_LICENSE("GPL"); |