/*
* LCD panel driver for LG.Philips LB035Q02
*
* Author: Steve Sakoman <steve@sakoman.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/spi/spi.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <video/omapdss.h>
#include <video/omap-panel-data.h>
struct lb035q02_data {
struct mutex lock;
};
static struct omap_video_timings lb035q02_timings = {
.x_res = 320,
.y_res = 240,
.pixel_clock = 6500,
.hsw = 2,
.hfp = 20,
.hbp = 68,
.vsw = 2,
.vfp = 4,
.vbp = 18,
.vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
.hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
.data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
.de_level = OMAPDSS_SIG_ACTIVE_HIGH,
.sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
};
static inline struct panel_generic_dpi_data
*get_panel_data(const struct omap_dss_device *dssdev)
{
return (struct panel_generic_dpi_data *) dssdev->data;
}
static int lb035q02_panel_power_on(struct omap_dss_device *dssdev)
{
struct panel_generic_dpi_data *panel_data = get_panel_data(dssdev);
int r, i;
if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
return 0;
omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
r = omapdss_dpi_display_enable(dssdev);
if (r)
goto err0;
for (i = 0; i < panel_data->num_gpios; ++i) {
gpio_set_value_cansleep(panel_data->gpios[i],
panel_data->gpio_invert[i] ? 0 : 1);
}
return 0;
err0:
return r;
}
static void lb035q02_panel_power_off(struct omap_dss_device *dssdev)
{
struct panel_generic_dpi_data *panel_data = get_panel_data(dssdev);
int i;
if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
return;
for (i = panel_data->num_gpios - 1; i >= 0; --i) {
gpio_set_value_cansleep(panel_data->gpios[i],
panel_data->gpio_invert[i] ? 1 : 0);
}
omapdss_dpi_display_disable(dssdev);
}
static int lb035q02_panel_probe(struct omap_dss_device *dssdev)
{
struct panel_generic_dpi_data *panel_data = get_panel_data(dssdev);
struct lb035q02_data *ld;
int r, i;
if (!panel_data)
return -EINVAL;
dssdev->panel.timings = lb035q02_timings;
ld = devm_kzalloc(&dssdev->dev, sizeof(*ld), GFP_KERNEL);
if (!ld)
return -ENOMEM;
for (i = 0; i < panel_data->num_gpios; ++i) {
r = devm_gpio_request_one(&dssdev->dev, panel_data->gpios[i],
panel_data->gpio_invert[i] ?
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
"panel gpio");
if (r)
return r;
}
mutex_init(&ld->lock);
dev_set_drvdata(&dssdev->dev, ld);
return 0;
}
static void lb035q02_panel_remove(struct omap_dss_device *dssdev)
{
}
static int lb035q02_panel_enable(struct omap_dss_device *dssdev)
{
struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
int r;
mutex_lock(&ld->lock);
r = lb035q02_panel_power_on(dssdev);
if (r)
goto err;
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
mutex_unlock(&ld->lock);
return 0;
err:
mutex_unlock(&ld->lock);
return r;
}
static void lb035q02_panel_disable(struct omap_dss_device *dssdev)
{
struct lb035q02_data *ld = dev_get_drvdata(&dssdev->dev);
mutex_lock(&ld->lock);
lb035q02_panel_power_off(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
mutex_unlock(&ld->lock);
}
static struct omap_dss_driver lb035q02_driver = {
.probe = lb035q02_panel_probe,
.remove = lb035q02_panel_remove,
.enable = lb035q02_panel_enable,
.disable = lb035q02_panel_disable,
.driver = {
.name = "lgphilips_lb035q02_panel",
.owner = THIS_MODULE,
},
};
static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
{
struct spi_message msg;
struct spi_transfer index_xfer = {
.len = 3,
.cs_change = 1,
};
struct spi_transfer value_xfer = {
.len = 3,
};
u8 buffer[16];
spi_message_init(&msg);
/* register index */
buffer[0] = 0x70;
buffer[1] = 0x00;
buffer[2] = reg & 0x7f;
index_xfer.tx_buf = buffer;
spi_message_add_tail(&index_xfer, &msg);
/* register value */
buffer[4] = 0x72;
buffer[5] = val >> 8;
buffer[6] = val;
value_xfer.tx_buf = buffer + 4;
spi_message_add_tail(&value_xfer, &msg);
return spi_sync(spi, &msg);
}
static void init_lb035q02_panel(struct spi_device *spi)
{
/* Init sequence from page 28 of the lb035q02 spec */
lb035q02_write_reg(spi, 0x01, 0x6300);
lb035q02_write_reg(spi, 0x02, 0x0200);
lb035q02_write_reg(spi, 0x03, 0x0177);
lb035q02_write_reg(spi, 0x04, 0x04c7);
lb035q02_write_reg(spi, 0x05, 0xffc0);
lb035q02_write_reg(spi, 0x06, 0xe806);
lb035q02_write_reg(spi, 0x0a, 0x4008);
lb035q02_write_reg(spi, 0x0b, 0x0000);
lb035q02_write_reg(spi, 0x0d, 0x0030);
lb035q02_write_reg(spi, 0x0e, 0x2800);
lb035q02_write_reg(spi, 0x0f, 0x0000);
lb035q02_write_reg(spi, 0x16, 0x9f80);
lb035q02_write_reg(spi, 0x17, 0x0a0f);
lb035q02_write_reg(spi, 0x1e, 0x00c1);
lb035q02_write_reg(spi, 0x30, 0x0300);
lb035q02_write_reg(spi, 0x31, 0x0007);
lb035q02_write_reg(spi, 0x32, 0x0000);
lb035q02_write_reg(spi, 0x33, 0x0000);
lb035q02_write_reg(spi, 0x34, 0x0707);
lb035q02_write_reg(spi, 0x35, 0x0004);
lb035q02_write_reg(spi, 0x36, 0x0302);
lb035q02_write_reg(spi, 0x37, 0x0202);
lb035q02_write_reg(spi, 0x3a, 0x0a0d);
lb035q02_write_reg(spi, 0x3b, 0x0806);
}
static int lb035q02_panel_spi_probe(struct spi_device *spi)
{
init_lb035q02_panel(spi);
return omap_dss_register_driver(&lb035q02_driver);
}
static int lb035q02_panel_spi_remove(struct spi_device *spi)
{
omap_dss_unregister_driver(&lb035q02_driver);
return 0;
}
static struct spi_driver lb035q02_spi_driver = {
.driver = {
.name = "lgphilips_lb035q02_panel-spi",
.owner = THIS_MODULE,
},
.probe = lb035q02_panel_spi_probe,
.remove = lb035q02_panel_spi_remove,
};
module_spi_driver(lb035q02_spi_driver);
MODULE_LICENSE("GPL");