blob: 048c98381ef6affd36417518881b890ec1f170dd [file] [log] [blame]
/*
* LCD panel driver for TPO TD043MTEA1
*
* Author: Gražvydas Ignotas <notasas@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <video/omapdss.h>
#define TPO_R02_MODE(x) ((x) & 7)
#define TPO_R02_MODE_800x480 7
#define TPO_R02_NCLK_RISING BIT(3)
#define TPO_R02_HSYNC_HIGH BIT(4)
#define TPO_R02_VSYNC_HIGH BIT(5)
#define TPO_R03_NSTANDBY BIT(0)
#define TPO_R03_EN_CP_CLK BIT(1)
#define TPO_R03_EN_VGL_PUMP BIT(2)
#define TPO_R03_EN_PWM BIT(3)
#define TPO_R03_DRIVING_CAP_100 BIT(4)
#define TPO_R03_EN_PRE_CHARGE BIT(6)
#define TPO_R03_SOFTWARE_CTL BIT(7)
#define TPO_R04_NFLIP_H BIT(0)
#define TPO_R04_NFLIP_V BIT(1)
#define TPO_R04_CP_CLK_FREQ_1H BIT(2)
#define TPO_R04_VGL_FREQ_1H BIT(4)
#define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
TPO_R03_EN_VGL_PUMP | TPO_R03_EN_PWM | \
TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
TPO_R03_SOFTWARE_CTL)
#define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
static const u16 tpo_td043_def_gamma[12] = {
105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
};
struct tpo_td043_device {
struct spi_device *spi;
struct regulator *vcc_reg;
int nreset_gpio;
u16 gamma[12];
u32 mode;
u32 hmirror:1;
u32 vmirror:1;
u32 powered_on:1;
u32 spi_suspended:1;
u32 power_on_resume:1;
};
/* used to pass spi_device from SPI to DSS portion of the driver */
static struct tpo_td043_device *g_tpo_td043;
static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
{
struct spi_message m;
struct spi_transfer xfer;
u16 w;
int r;
spi_message_init(&m);
memset(&xfer, 0, sizeof(xfer));
w = ((u16)addr << 10) | (1 << 8) | data;
xfer.tx_buf = &w;
xfer.bits_per_word = 16;
xfer.len = 2;
spi_message_add_tail(&xfer, &m);
r = spi_sync(spi, &m);
if (r < 0)
dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
return r;
}
static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
{
u8 i, val;
/* gamma bits [9:8] */
for (val = i = 0; i < 4; i++)
val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
tpo_td043_write(spi, 0x11, val);
for (val = i = 0; i < 4; i++)
val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
tpo_td043_write(spi, 0x12, val);
for (val = i = 0; i < 4; i++)
val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
tpo_td043_write(spi, 0x13, val);
/* gamma bits [7:0] */
for (val = i = 0; i < 12; i++)
tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
}
static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
{
u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
if (h)
reg4 &= ~TPO_R04_NFLIP_H;
if (v)
reg4 &= ~TPO_R04_NFLIP_V;
return tpo_td043_write(spi, 4, reg4);
}
static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
tpo_td043->hmirror = enable;
return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
tpo_td043->vmirror);
}
static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
return tpo_td043->hmirror;
}
static ssize_t tpo_td043_vmirror_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
}
static ssize_t tpo_td043_vmirror_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
int val;
int ret;
ret = kstrtoint(buf, 0, &val);
if (ret < 0)
return ret;
val = !!val;
ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
if (ret < 0)
return ret;
tpo_td043->vmirror = val;
return count;
}
static ssize_t tpo_td043_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
}
static ssize_t tpo_td043_mode_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
long val;
int ret;
ret = kstrtol(buf, 0, &val);
if (ret != 0 || val & ~7)
return -EINVAL;
tpo_td043->mode = val;
val |= TPO_R02_NCLK_RISING;
tpo_td043_write(tpo_td043->spi, 2, val);
return count;
}
static ssize_t tpo_td043_gamma_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
ssize_t len = 0;
int ret;
int i;
for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
tpo_td043->gamma[i]);
if (ret < 0)
return ret;
len += ret;
}
buf[len - 1] = '\n';
return len;
}
static ssize_t tpo_td043_gamma_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
unsigned int g[12];
int ret;
int i;
ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
&g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
&g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
if (ret != 12)
return -EINVAL;
for (i = 0; i < 12; i++)
tpo_td043->gamma[i] = g[i];
tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
return count;
}
static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
tpo_td043_vmirror_show, tpo_td043_vmirror_store);
static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
tpo_td043_mode_show, tpo_td043_mode_store);
static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
tpo_td043_gamma_show, tpo_td043_gamma_store);
static struct attribute *tpo_td043_attrs[] = {
&dev_attr_vmirror.attr,
&dev_attr_mode.attr,
&dev_attr_gamma.attr,
NULL,
};
static struct attribute_group tpo_td043_attr_group = {
.attrs = tpo_td043_attrs,
};
static const struct omap_video_timings tpo_td043_timings = {
.x_res = 800,
.y_res = 480,
.pixel_clock = 36000,
.hsw = 1,
.hfp = 68,
.hbp = 214,
.vsw = 1,
.vfp = 39,
.vbp = 34,
.vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
.hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
.data_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
.de_level = OMAPDSS_SIG_ACTIVE_HIGH,
.sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
};
static int tpo_td043_power_on(struct tpo_td043_device *tpo_td043)
{
int nreset_gpio = tpo_td043->nreset_gpio;
int r;
if (tpo_td043->powered_on)
return 0;
r = regulator_enable(tpo_td043->vcc_reg);
if (r != 0)
return r;
/* wait for panel to stabilize */
msleep(160);
if (gpio_is_valid(nreset_gpio))
gpio_set_value(nreset_gpio, 1);
tpo_td043_write(tpo_td043->spi, 2,
TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
tpo_td043->vmirror);
tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
tpo_td043->powered_on = 1;
return 0;
}
static void tpo_td043_power_off(struct tpo_td043_device *tpo_td043)
{
int nreset_gpio = tpo_td043->nreset_gpio;
if (!tpo_td043->powered_on)
return;
tpo_td043_write(tpo_td043->spi, 3,
TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
if (gpio_is_valid(nreset_gpio))
gpio_set_value(nreset_gpio, 0);
/* wait for at least 2 vsyncs before cutting off power */
msleep(50);
tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
regulator_disable(tpo_td043->vcc_reg);
tpo_td043->powered_on = 0;
}
static int tpo_td043_enable_dss(struct omap_dss_device *dssdev)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
int r;
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;
if (dssdev->platform_enable) {
r = dssdev->platform_enable(dssdev);
if (r)
goto err1;
}
/*
* If we are resuming from system suspend, SPI clocks might not be
* enabled yet, so we'll program the LCD from SPI PM resume callback.
*/
if (!tpo_td043->spi_suspended) {
r = tpo_td043_power_on(tpo_td043);
if (r)
goto err1;
}
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
return 0;
err1:
omapdss_dpi_display_disable(dssdev);
err0:
return r;
}
static void tpo_td043_disable_dss(struct omap_dss_device *dssdev)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
return;
if (dssdev->platform_disable)
dssdev->platform_disable(dssdev);
omapdss_dpi_display_disable(dssdev);
if (!tpo_td043->spi_suspended)
tpo_td043_power_off(tpo_td043);
}
static int tpo_td043_enable(struct omap_dss_device *dssdev)
{
dev_dbg(&dssdev->dev, "enable\n");
return tpo_td043_enable_dss(dssdev);
}
static void tpo_td043_disable(struct omap_dss_device *dssdev)
{
dev_dbg(&dssdev->dev, "disable\n");
tpo_td043_disable_dss(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}
static int tpo_td043_probe(struct omap_dss_device *dssdev)
{
struct tpo_td043_device *tpo_td043 = g_tpo_td043;
int nreset_gpio = dssdev->reset_gpio;
int ret = 0;
dev_dbg(&dssdev->dev, "probe\n");
if (tpo_td043 == NULL) {
dev_err(&dssdev->dev, "missing tpo_td043_device\n");
return -ENODEV;
}
dssdev->panel.timings = tpo_td043_timings;
dssdev->ctrl.pixel_size = 24;
tpo_td043->mode = TPO_R02_MODE_800x480;
memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
if (IS_ERR(tpo_td043->vcc_reg)) {
dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
ret = PTR_ERR(tpo_td043->vcc_reg);
goto fail_regulator;
}
if (gpio_is_valid(nreset_gpio)) {
ret = gpio_request_one(nreset_gpio, GPIOF_OUT_INIT_LOW,
"lcd reset");
if (ret < 0) {
dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
goto fail_gpio_req;
}
}
ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
if (ret)
dev_warn(&dssdev->dev, "failed to create sysfs files\n");
dev_set_drvdata(&dssdev->dev, tpo_td043);
return 0;
fail_gpio_req:
regulator_put(tpo_td043->vcc_reg);
fail_regulator:
kfree(tpo_td043);
return ret;
}
static void tpo_td043_remove(struct omap_dss_device *dssdev)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
int nreset_gpio = dssdev->reset_gpio;
dev_dbg(&dssdev->dev, "remove\n");
sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
regulator_put(tpo_td043->vcc_reg);
if (gpio_is_valid(nreset_gpio))
gpio_free(nreset_gpio);
}
static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
omapdss_dpi_set_timings(dssdev, timings);
dssdev->panel.timings = *timings;
}
static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
struct omap_video_timings *timings)
{
return dpi_check_timings(dssdev, timings);
}
static struct omap_dss_driver tpo_td043_driver = {
.probe = tpo_td043_probe,
.remove = tpo_td043_remove,
.enable = tpo_td043_enable,
.disable = tpo_td043_disable,
.set_mirror = tpo_td043_set_hmirror,
.get_mirror = tpo_td043_get_hmirror,
.set_timings = tpo_td043_set_timings,
.check_timings = tpo_td043_check_timings,
.driver = {
.name = "tpo_td043mtea1_panel",
.owner = THIS_MODULE,
},
};
static int tpo_td043_spi_probe(struct spi_device *spi)
{
struct omap_dss_device *dssdev = spi->dev.platform_data;
struct tpo_td043_device *tpo_td043;
int ret;
if (dssdev == NULL) {
dev_err(&spi->dev, "missing dssdev\n");
return -ENODEV;
}
if (g_tpo_td043 != NULL)
return -EBUSY;
spi->bits_per_word = 16;
spi->mode = SPI_MODE_0;
ret = spi_setup(spi);
if (ret < 0) {
dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
return ret;
}
tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
if (tpo_td043 == NULL)
return -ENOMEM;
tpo_td043->spi = spi;
tpo_td043->nreset_gpio = dssdev->reset_gpio;
dev_set_drvdata(&spi->dev, tpo_td043);
g_tpo_td043 = tpo_td043;
omap_dss_register_driver(&tpo_td043_driver);
return 0;
}
static int tpo_td043_spi_remove(struct spi_device *spi)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
omap_dss_unregister_driver(&tpo_td043_driver);
kfree(tpo_td043);
g_tpo_td043 = NULL;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tpo_td043_spi_suspend(struct device *dev)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", tpo_td043);
tpo_td043->power_on_resume = tpo_td043->powered_on;
tpo_td043_power_off(tpo_td043);
tpo_td043->spi_suspended = 1;
return 0;
}
static int tpo_td043_spi_resume(struct device *dev)
{
struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
int ret;
dev_dbg(dev, "tpo_td043_spi_resume\n");
if (tpo_td043->power_on_resume) {
ret = tpo_td043_power_on(tpo_td043);
if (ret)
return ret;
}
tpo_td043->spi_suspended = 0;
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
tpo_td043_spi_suspend, tpo_td043_spi_resume);
static struct spi_driver tpo_td043_spi_driver = {
.driver = {
.name = "tpo_td043mtea1_panel_spi",
.owner = THIS_MODULE,
.pm = &tpo_td043_spi_pm,
},
.probe = tpo_td043_spi_probe,
.remove = tpo_td043_spi_remove,
};
module_spi_driver(tpo_td043_spi_driver);
MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
MODULE_LICENSE("GPL");