Tomi Valkeinen | f92f168 | 2013-05-21 17:14:29 +0300 | [diff] [blame] | 1 | /* |
| 2 | * LG.Philips LB035Q02 LCD Panel driver |
| 3 | * |
| 4 | * Copyright (C) 2013 Texas Instruments |
| 5 | * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> |
| 6 | * Based on a driver by: Steve Sakoman <steve@sakoman.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License version 2 as published by |
| 10 | * the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/delay.h> |
| 15 | #include <linux/spi/spi.h> |
| 16 | #include <linux/mutex.h> |
| 17 | #include <linux/gpio.h> |
| 18 | |
| 19 | #include <video/omapdss.h> |
| 20 | #include <video/omap-panel-data.h> |
| 21 | |
| 22 | static struct omap_video_timings lb035q02_timings = { |
| 23 | .x_res = 320, |
| 24 | .y_res = 240, |
| 25 | |
| 26 | .pixel_clock = 6500, |
| 27 | |
| 28 | .hsw = 2, |
| 29 | .hfp = 20, |
| 30 | .hbp = 68, |
| 31 | |
| 32 | .vsw = 2, |
| 33 | .vfp = 4, |
| 34 | .vbp = 18, |
| 35 | |
| 36 | .vsync_level = OMAPDSS_SIG_ACTIVE_LOW, |
| 37 | .hsync_level = OMAPDSS_SIG_ACTIVE_LOW, |
| 38 | .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE, |
| 39 | .de_level = OMAPDSS_SIG_ACTIVE_HIGH, |
| 40 | .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES, |
| 41 | }; |
| 42 | |
| 43 | struct panel_drv_data { |
| 44 | struct omap_dss_device dssdev; |
| 45 | struct omap_dss_device *in; |
| 46 | |
| 47 | struct spi_device *spi; |
| 48 | |
| 49 | int data_lines; |
| 50 | |
| 51 | struct omap_video_timings videomode; |
| 52 | |
| 53 | int reset_gpio; |
| 54 | int backlight_gpio; |
| 55 | int enable_gpio; |
| 56 | }; |
| 57 | |
| 58 | #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) |
| 59 | |
| 60 | static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val) |
| 61 | { |
| 62 | struct spi_message msg; |
| 63 | struct spi_transfer index_xfer = { |
| 64 | .len = 3, |
| 65 | .cs_change = 1, |
| 66 | }; |
| 67 | struct spi_transfer value_xfer = { |
| 68 | .len = 3, |
| 69 | }; |
| 70 | u8 buffer[16]; |
| 71 | |
| 72 | spi_message_init(&msg); |
| 73 | |
| 74 | /* register index */ |
| 75 | buffer[0] = 0x70; |
| 76 | buffer[1] = 0x00; |
| 77 | buffer[2] = reg & 0x7f; |
| 78 | index_xfer.tx_buf = buffer; |
| 79 | spi_message_add_tail(&index_xfer, &msg); |
| 80 | |
| 81 | /* register value */ |
| 82 | buffer[4] = 0x72; |
| 83 | buffer[5] = val >> 8; |
| 84 | buffer[6] = val; |
| 85 | value_xfer.tx_buf = buffer + 4; |
| 86 | spi_message_add_tail(&value_xfer, &msg); |
| 87 | |
| 88 | return spi_sync(spi, &msg); |
| 89 | } |
| 90 | |
| 91 | static void init_lb035q02_panel(struct spi_device *spi) |
| 92 | { |
| 93 | /* Init sequence from page 28 of the lb035q02 spec */ |
| 94 | lb035q02_write_reg(spi, 0x01, 0x6300); |
| 95 | lb035q02_write_reg(spi, 0x02, 0x0200); |
| 96 | lb035q02_write_reg(spi, 0x03, 0x0177); |
| 97 | lb035q02_write_reg(spi, 0x04, 0x04c7); |
| 98 | lb035q02_write_reg(spi, 0x05, 0xffc0); |
| 99 | lb035q02_write_reg(spi, 0x06, 0xe806); |
| 100 | lb035q02_write_reg(spi, 0x0a, 0x4008); |
| 101 | lb035q02_write_reg(spi, 0x0b, 0x0000); |
| 102 | lb035q02_write_reg(spi, 0x0d, 0x0030); |
| 103 | lb035q02_write_reg(spi, 0x0e, 0x2800); |
| 104 | lb035q02_write_reg(spi, 0x0f, 0x0000); |
| 105 | lb035q02_write_reg(spi, 0x16, 0x9f80); |
| 106 | lb035q02_write_reg(spi, 0x17, 0x0a0f); |
| 107 | lb035q02_write_reg(spi, 0x1e, 0x00c1); |
| 108 | lb035q02_write_reg(spi, 0x30, 0x0300); |
| 109 | lb035q02_write_reg(spi, 0x31, 0x0007); |
| 110 | lb035q02_write_reg(spi, 0x32, 0x0000); |
| 111 | lb035q02_write_reg(spi, 0x33, 0x0000); |
| 112 | lb035q02_write_reg(spi, 0x34, 0x0707); |
| 113 | lb035q02_write_reg(spi, 0x35, 0x0004); |
| 114 | lb035q02_write_reg(spi, 0x36, 0x0302); |
| 115 | lb035q02_write_reg(spi, 0x37, 0x0202); |
| 116 | lb035q02_write_reg(spi, 0x3a, 0x0a0d); |
| 117 | lb035q02_write_reg(spi, 0x3b, 0x0806); |
| 118 | } |
| 119 | |
| 120 | static int lb035q02_connect(struct omap_dss_device *dssdev) |
| 121 | { |
| 122 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 123 | struct omap_dss_device *in = ddata->in; |
| 124 | int r; |
| 125 | |
| 126 | if (omapdss_device_is_connected(dssdev)) |
| 127 | return 0; |
| 128 | |
| 129 | r = in->ops.dpi->connect(in, dssdev); |
| 130 | if (r) |
| 131 | return r; |
| 132 | |
| 133 | init_lb035q02_panel(ddata->spi); |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static void lb035q02_disconnect(struct omap_dss_device *dssdev) |
| 139 | { |
| 140 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 141 | struct omap_dss_device *in = ddata->in; |
| 142 | |
| 143 | if (!omapdss_device_is_connected(dssdev)) |
| 144 | return; |
| 145 | |
| 146 | in->ops.dpi->disconnect(in, dssdev); |
| 147 | } |
| 148 | |
| 149 | static int lb035q02_enable(struct omap_dss_device *dssdev) |
| 150 | { |
| 151 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 152 | struct omap_dss_device *in = ddata->in; |
| 153 | int r; |
| 154 | |
| 155 | if (!omapdss_device_is_connected(dssdev)) |
| 156 | return -ENODEV; |
| 157 | |
| 158 | if (omapdss_device_is_enabled(dssdev)) |
| 159 | return 0; |
| 160 | |
| 161 | in->ops.dpi->set_data_lines(in, ddata->data_lines); |
| 162 | in->ops.dpi->set_timings(in, &ddata->videomode); |
| 163 | |
| 164 | r = in->ops.dpi->enable(in); |
| 165 | if (r) |
| 166 | return r; |
| 167 | |
| 168 | if (gpio_is_valid(ddata->enable_gpio)) |
| 169 | gpio_set_value_cansleep(ddata->enable_gpio, 1); |
| 170 | |
| 171 | if (gpio_is_valid(ddata->backlight_gpio)) |
| 172 | gpio_set_value_cansleep(ddata->backlight_gpio, 1); |
| 173 | |
| 174 | dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static void lb035q02_disable(struct omap_dss_device *dssdev) |
| 180 | { |
| 181 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 182 | struct omap_dss_device *in = ddata->in; |
| 183 | |
| 184 | if (!omapdss_device_is_enabled(dssdev)) |
| 185 | return; |
| 186 | |
| 187 | if (gpio_is_valid(ddata->enable_gpio)) |
| 188 | gpio_set_value_cansleep(ddata->enable_gpio, 0); |
| 189 | |
| 190 | if (gpio_is_valid(ddata->backlight_gpio)) |
| 191 | gpio_set_value_cansleep(ddata->backlight_gpio, 0); |
| 192 | |
| 193 | in->ops.dpi->disable(in); |
| 194 | |
| 195 | dssdev->state = OMAP_DSS_DISPLAY_DISABLED; |
| 196 | } |
| 197 | |
| 198 | static void lb035q02_set_timings(struct omap_dss_device *dssdev, |
| 199 | struct omap_video_timings *timings) |
| 200 | { |
| 201 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 202 | struct omap_dss_device *in = ddata->in; |
| 203 | |
| 204 | ddata->videomode = *timings; |
| 205 | dssdev->panel.timings = *timings; |
| 206 | |
| 207 | in->ops.dpi->set_timings(in, timings); |
| 208 | } |
| 209 | |
| 210 | static void lb035q02_get_timings(struct omap_dss_device *dssdev, |
| 211 | struct omap_video_timings *timings) |
| 212 | { |
| 213 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 214 | |
| 215 | *timings = ddata->videomode; |
| 216 | } |
| 217 | |
| 218 | static int lb035q02_check_timings(struct omap_dss_device *dssdev, |
| 219 | struct omap_video_timings *timings) |
| 220 | { |
| 221 | struct panel_drv_data *ddata = to_panel_data(dssdev); |
| 222 | struct omap_dss_device *in = ddata->in; |
| 223 | |
| 224 | return in->ops.dpi->check_timings(in, timings); |
| 225 | } |
| 226 | |
| 227 | static struct omap_dss_driver lb035q02_ops = { |
| 228 | .connect = lb035q02_connect, |
| 229 | .disconnect = lb035q02_disconnect, |
| 230 | |
| 231 | .enable = lb035q02_enable, |
| 232 | .disable = lb035q02_disable, |
| 233 | |
| 234 | .set_timings = lb035q02_set_timings, |
| 235 | .get_timings = lb035q02_get_timings, |
| 236 | .check_timings = lb035q02_check_timings, |
| 237 | |
| 238 | .get_resolution = omapdss_default_get_resolution, |
| 239 | }; |
| 240 | |
| 241 | static int lb035q02_probe_pdata(struct spi_device *spi) |
| 242 | { |
| 243 | const struct panel_lb035q02_platform_data *pdata; |
| 244 | struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev); |
| 245 | struct omap_dss_device *dssdev, *in; |
| 246 | |
| 247 | pdata = dev_get_platdata(&spi->dev); |
| 248 | |
| 249 | in = omap_dss_find_output(pdata->source); |
| 250 | if (in == NULL) { |
| 251 | dev_err(&spi->dev, "failed to find video source '%s'\n", |
| 252 | pdata->source); |
| 253 | return -EPROBE_DEFER; |
| 254 | } |
| 255 | |
| 256 | ddata->in = in; |
| 257 | |
| 258 | ddata->data_lines = pdata->data_lines; |
| 259 | |
| 260 | dssdev = &ddata->dssdev; |
| 261 | dssdev->name = pdata->name; |
| 262 | |
| 263 | ddata->enable_gpio = pdata->enable_gpio; |
| 264 | ddata->backlight_gpio = pdata->backlight_gpio; |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static int lb035q02_panel_spi_probe(struct spi_device *spi) |
| 270 | { |
| 271 | struct panel_drv_data *ddata; |
| 272 | struct omap_dss_device *dssdev; |
| 273 | int r; |
| 274 | |
| 275 | ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL); |
| 276 | if (ddata == NULL) |
| 277 | return -ENOMEM; |
| 278 | |
| 279 | dev_set_drvdata(&spi->dev, ddata); |
| 280 | |
| 281 | ddata->spi = spi; |
| 282 | |
| 283 | if (dev_get_platdata(&spi->dev)) { |
| 284 | r = lb035q02_probe_pdata(spi); |
| 285 | if (r) |
| 286 | return r; |
| 287 | } else { |
| 288 | return -ENODEV; |
| 289 | } |
| 290 | |
| 291 | if (gpio_is_valid(ddata->enable_gpio)) { |
| 292 | r = devm_gpio_request_one(&spi->dev, ddata->enable_gpio, |
| 293 | GPIOF_OUT_INIT_LOW, "panel enable"); |
| 294 | if (r) |
| 295 | goto err_gpio; |
| 296 | } |
| 297 | |
| 298 | if (gpio_is_valid(ddata->backlight_gpio)) { |
| 299 | r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio, |
| 300 | GPIOF_OUT_INIT_LOW, "panel backlight"); |
| 301 | if (r) |
| 302 | goto err_gpio; |
| 303 | } |
| 304 | |
| 305 | ddata->videomode = lb035q02_timings; |
| 306 | |
| 307 | dssdev = &ddata->dssdev; |
| 308 | dssdev->dev = &spi->dev; |
| 309 | dssdev->driver = &lb035q02_ops; |
| 310 | dssdev->type = OMAP_DISPLAY_TYPE_DPI; |
| 311 | dssdev->owner = THIS_MODULE; |
| 312 | dssdev->panel.timings = ddata->videomode; |
| 313 | dssdev->phy.dpi.data_lines = ddata->data_lines; |
| 314 | |
| 315 | r = omapdss_register_display(dssdev); |
| 316 | if (r) { |
| 317 | dev_err(&spi->dev, "Failed to register panel\n"); |
| 318 | goto err_reg; |
| 319 | } |
| 320 | |
| 321 | return 0; |
| 322 | |
| 323 | err_reg: |
| 324 | err_gpio: |
| 325 | omap_dss_put_device(ddata->in); |
| 326 | return r; |
| 327 | } |
| 328 | |
| 329 | static int lb035q02_panel_spi_remove(struct spi_device *spi) |
| 330 | { |
| 331 | struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev); |
| 332 | struct omap_dss_device *dssdev = &ddata->dssdev; |
| 333 | struct omap_dss_device *in = ddata->in; |
| 334 | |
| 335 | omapdss_unregister_display(dssdev); |
| 336 | |
| 337 | lb035q02_disable(dssdev); |
| 338 | lb035q02_disconnect(dssdev); |
| 339 | |
| 340 | omap_dss_put_device(in); |
| 341 | |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | static struct spi_driver lb035q02_spi_driver = { |
| 346 | .probe = lb035q02_panel_spi_probe, |
| 347 | .remove = lb035q02_panel_spi_remove, |
| 348 | .driver = { |
| 349 | .name = "panel_lgphilips_lb035q02", |
| 350 | .owner = THIS_MODULE, |
| 351 | }, |
| 352 | }; |
| 353 | |
| 354 | module_spi_driver(lb035q02_spi_driver); |
| 355 | |
| 356 | MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); |
| 357 | MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver"); |
| 358 | MODULE_LICENSE("GPL"); |