[mirror_ubuntu-artful-kernel.git] / drivers / staging / fbtft / fb_ssd1331.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/delay.h>

#include "fbtft.h"

#define DRVNAME		"fb_ssd1331"
#define WIDTH		96
#define HEIGHT		64
#define GAMMA_NUM	1
#define GAMMA_LEN	63
#define DEFAULT_GAMMA	"0 2 2 2 2 2 2 2 " \
			"2 2 2 2 2 2 2 2 " \
			"2 2 2 2 2 2 2 2 " \
			"2 2 2 2 2 2 2 2 " \
			"2 2 2 2 2 2 2 2 " \
			"2 2 2 2 2 2 2 2 " \
			"2 2 2 2 2 2 2 2 " \
			"2 2 2 2 2 2 2" \

static int init_display(struct fbtft_par *par)
{
	par->fbtftops.reset(par);

	write_reg(par, 0xae); /* Display Off */
	write_reg(par, 0xa0, 0x70 | (par->bgr << 2)); /* Set Colour Depth */
	write_reg(par, 0x72); /* RGB colour */
	write_reg(par, 0xa1, 0x00); /* Set Display Start Line */
	write_reg(par, 0xa2, 0x00); /* Set Display Offset */
	write_reg(par, 0xa4); /* NORMALDISPLAY */
	write_reg(par, 0xa8, 0x3f); /* Set multiplex */
	write_reg(par, 0xad, 0x8e); /* Set master */
	/* write_reg(par, 0xb0, 0x0b);  Set power mode */
	write_reg(par, 0xb1, 0x31); /* Precharge */
	write_reg(par, 0xb3, 0xf0); /* Clock div */
	write_reg(par, 0x8a, 0x64); /* Precharge A */
	write_reg(par, 0x8b, 0x78); /* Precharge B */
	write_reg(par, 0x8c, 0x64); /* Precharge C */
	write_reg(par, 0xbb, 0x3a); /* Precharge level */
	write_reg(par, 0xbe, 0x3e); /* vcomh */
	write_reg(par, 0x87, 0x06); /* Master current */
	write_reg(par, 0x81, 0x91); /* Contrast A */
	write_reg(par, 0x82, 0x50); /* Contrast B */
	write_reg(par, 0x83, 0x7d); /* Contrast C */
	write_reg(par, 0xaf); /* Set Sleep Mode Display On */

	return 0;
}

static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	write_reg(par, 0x15, xs, xe);
	write_reg(par, 0x75, ys, ye);
}

static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
{
	va_list args;
	int i, ret;
	u8 *buf = par->buf;

	if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
		va_start(args, len);
		for (i = 0; i < len; i++)
			buf[i] = (u8)va_arg(args, unsigned int);
		va_end(args);
		fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, u8, buf, len, "%s: ", __func__);
	}

	va_start(args, len);

	*buf = (u8)va_arg(args, unsigned int);
	if (par->gpio.dc != -1)
		gpio_set_value(par->gpio.dc, 0);
	ret = par->fbtftops.write(par, par->buf, sizeof(u8));
	if (ret < 0) {
		va_end(args);
		dev_err(par->info->device,
			"write() failed and returned %d\n", ret);
		return;
	}
	len--;

	if (len) {
		i = len;
		while (i--)
			*buf++ = (u8)va_arg(args, unsigned int);
		ret = par->fbtftops.write(par, par->buf, len * (sizeof(u8)));
		if (ret < 0) {
			va_end(args);
			dev_err(par->info->device,
				"write() failed and returned %d\n", ret);
			return;
		}
	}
	if (par->gpio.dc != -1)
		gpio_set_value(par->gpio.dc, 1);
	va_end(args);
}

/*
 * Grayscale Lookup Table
 * GS1 - GS63
 * The driver Gamma curve contains the relative values between the entries
 * in the Lookup table.
 *
 * From datasheet:
 * 8.8 Gray Scale Decoder
 *
 * there are total 180 Gamma Settings (Setting 0 to Setting 180)
 * available for the Gray Scale table.
 *
 * The gray scale is defined in incremental way, with reference
 * to the length of previous table entry:
 * Setting of GS1 has to be >= 0
 * Setting of GS2 has to be > Setting of GS1 +1
 * Setting of GS3 has to be > Setting of GS2 +1
 * :
 * Setting of GS63 has to be > Setting of GS62 +1
 *
 */
static int set_gamma(struct fbtft_par *par, u32 *curves)
{
	unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
	int i, acc = 0;

	for (i = 0; i < 63; i++) {
		if (i > 0 && curves[i] < 2) {
			dev_err(par->info->device,
				"Illegal value in Grayscale Lookup Table at index %d. " \
				"Must be greater than 1\n", i);
			return -EINVAL;
		}
		acc += curves[i];
		tmp[i] = acc;
		if (acc > 180) {
			dev_err(par->info->device,
				"Illegal value(s) in Grayscale Lookup Table. " \
				"At index=%d, the accumulated value has exceeded 180\n", i);
			return -EINVAL;
		}
	}

	write_reg(par, 0xB8,
		  tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6],
		  tmp[7], tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13],
		  tmp[14], tmp[15], tmp[16], tmp[17], tmp[18], tmp[19], tmp[20],
		  tmp[21], tmp[22], tmp[23], tmp[24], tmp[25], tmp[26],	tmp[27],
		  tmp[28], tmp[29], tmp[30], tmp[31], tmp[32], tmp[33], tmp[34],
		  tmp[35], tmp[36], tmp[37], tmp[38], tmp[39], tmp[40], tmp[41],
		  tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47], tmp[48],
		  tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55],
		  tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61],
		  tmp[62]);

	return 0;
}

static int blank(struct fbtft_par *par, bool on)
{
	fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n",
		      __func__, on ? "true" : "false");
	if (on)
		write_reg(par, 0xAE);
	else
		write_reg(par, 0xAF);
	return 0;
}

static struct fbtft_display display = {
	.regwidth = 8,
	.width = WIDTH,
	.height = HEIGHT,
	.gamma_num = GAMMA_NUM,
	.gamma_len = GAMMA_LEN,
	.gamma = DEFAULT_GAMMA,
	.fbtftops = {
		.write_register = write_reg8_bus8,
		.init_display = init_display,
		.set_addr_win = set_addr_win,
		.set_gamma = set_gamma,
		.blank = blank,
	},
};

FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1331", &display);

MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:ssd1331");
MODULE_ALIAS("platform:ssd1331");

MODULE_DESCRIPTION("SSD1331 OLED Driver");
MODULE_AUTHOR("Alec Smecher (adapted from SSD1351 by James Davies)");
MODULE_LICENSE("GPL");
Commit	Line	Data
dc746091 TP	1	#include <linux/module.h>
	2	#include <linux/kernel.h>
	3	#include <linux/init.h>
	4	#include <linux/gpio.h>
	5	#include <linux/spi/spi.h>
	6	#include <linux/delay.h>
	7
	8	#include "fbtft.h"
	9
	10	#define DRVNAME "fb_ssd1331"
	11	#define WIDTH 96
	12	#define HEIGHT 64
	13	#define GAMMA_NUM 1
	14	#define GAMMA_LEN 63
	15	#define DEFAULT_GAMMA "0 2 2 2 2 2 2 2 " \
	16	"2 2 2 2 2 2 2 2 " \
	17	"2 2 2 2 2 2 2 2 " \
	18	"2 2 2 2 2 2 2 2 " \
	19	"2 2 2 2 2 2 2 2 " \
	20	"2 2 2 2 2 2 2 2 " \
	21	"2 2 2 2 2 2 2 2 " \
	22	"2 2 2 2 2 2 2" \
	23
	24	static int init_display(struct fbtft_par *par)
	25	{
dc746091 TP	26	par->fbtftops.reset(par);
	27
	28	write_reg(par, 0xae); /* Display Off */
	29	write_reg(par, 0xa0, 0x70 \| (par->bgr << 2)); /* Set Colour Depth */
e64e0047	30	write_reg(par, 0x72); /* RGB colour */
dc746091 TP	31	write_reg(par, 0xa1, 0x00); /* Set Display Start Line */
	32	write_reg(par, 0xa2, 0x00); /* Set Display Offset */
	33	write_reg(par, 0xa4); /* NORMALDISPLAY */
e64e0047 MY	34	write_reg(par, 0xa8, 0x3f); /* Set multiplex */
	35	write_reg(par, 0xad, 0x8e); /* Set master */
	36	/* write_reg(par, 0xb0, 0x0b); Set power mode */
	37	write_reg(par, 0xb1, 0x31); /* Precharge */
	38	write_reg(par, 0xb3, 0xf0); /* Clock div */
	39	write_reg(par, 0x8a, 0x64); /* Precharge A */
	40	write_reg(par, 0x8b, 0x78); /* Precharge B */
	41	write_reg(par, 0x8c, 0x64); /* Precharge C */
	42	write_reg(par, 0xbb, 0x3a); /* Precharge level */
	43	write_reg(par, 0xbe, 0x3e); /* vcomh */
	44	write_reg(par, 0x87, 0x06); /* Master current */
	45	write_reg(par, 0x81, 0x91); /* Contrast A */
	46	write_reg(par, 0x82, 0x50); /* Contrast B */
	47	write_reg(par, 0x83, 0x7d); /* Contrast C */
dc746091 TP	48	write_reg(par, 0xaf); /* Set Sleep Mode Display On */
	49
	50	return 0;
	51	}
	52
	53	static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
	54	{
dc746091 TP	55	write_reg(par, 0x15, xs, xe);
	56	write_reg(par, 0x75, ys, ye);
	57	}
	58
	59	static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
	60	{
	61	va_list args;
	62	int i, ret;
f1092794	63	u8 *buf = par->buf;
dc746091 TP	64
	65	if (unlikely(par->debug & DEBUG_WRITE_REGISTER)) {
	66	va_start(args, len);
0728b01c	67	for (i = 0; i < len; i++)
dc746091	68	buf[i] = (u8)va_arg(args, unsigned int);
dc746091 TP	69	va_end(args);
	70	fbtft_par_dbg_hex(DEBUG_WRITE_REGISTER, par, par->info->device, u8, buf, len, "%s: ", __func__);
	71	}
	72
	73	va_start(args, len);
	74
	75	*buf = (u8)va_arg(args, unsigned int);
	76	if (par->gpio.dc != -1)
	77	gpio_set_value(par->gpio.dc, 0);
	78	ret = par->fbtftops.write(par, par->buf, sizeof(u8));
	79	if (ret < 0) {
	80	va_end(args);
aed1c72e HM	81	dev_err(par->info->device,
aed1c72e HM	82	"write() failed and returned %d\n", ret);
dc746091 TP	83	return;
	84	}
	85	len--;
	86
	87	if (len) {
	88	i = len;
0728b01c	89	while (i--)
dc746091	90	*buf++ = (u8)va_arg(args, unsigned int);
dc746091 TP	91	ret = par->fbtftops.write(par, par->buf, len * (sizeof(u8)));
	92	if (ret < 0) {
	93	va_end(args);
aed1c72e HM	94	dev_err(par->info->device,
aed1c72e HM	95	"write() failed and returned %d\n", ret);
dc746091 TP	96	return;
	97	}
	98	}
	99	if (par->gpio.dc != -1)
	100	gpio_set_value(par->gpio.dc, 1);
	101	va_end(args);
	102	}
	103
	104	/*
ba6ed643 AJ	105	* Grayscale Lookup Table
	106	* GS1 - GS63
	107	* The driver Gamma curve contains the relative values between the entries
	108	* in the Lookup table.
	109	*
	110	* From datasheet:
	111	* 8.8 Gray Scale Decoder
	112	*
	113	* there are total 180 Gamma Settings (Setting 0 to Setting 180)
	114	* available for the Gray Scale table.
	115	*
	116	* The gray scale is defined in incremental way, with reference
	117	* to the length of previous table entry:
	118	* Setting of GS1 has to be >= 0
	119	* Setting of GS2 has to be > Setting of GS1 +1
	120	* Setting of GS3 has to be > Setting of GS2 +1
	121	* :
	122	* Setting of GS63 has to be > Setting of GS62 +1
	123	*
	124	*/
22eb36b8	125	static int set_gamma(struct fbtft_par par, u32 curves)
dc746091 TP	126	{
	127	unsigned long tmp[GAMMA_NUM * GAMMA_LEN];
	128	int i, acc = 0;
	129
dc746091 TP	130	for (i = 0; i < 63; i++) {
	131	if (i > 0 && curves[i] < 2) {
	132	dev_err(par->info->device,
	133	"Illegal value in Grayscale Lookup Table at index %d. " \
	134	"Must be greater than 1\n", i);
	135	return -EINVAL;
	136	}
	137	acc += curves[i];
	138	tmp[i] = acc;
	139	if (acc > 180) {
	140	dev_err(par->info->device,
	141	"Illegal value(s) in Grayscale Lookup Table. " \
	142	"At index=%d, the accumulated value has exceeded 180\n", i);
	143	return -EINVAL;
	144	}
	145	}
	146
	147	write_reg(par, 0xB8,
307a0824 UR	148	tmp[0], tmp[1], tmp[2], tmp[3], tmp[4], tmp[5], tmp[6],
	149	tmp[7], tmp[8], tmp[9], tmp[10], tmp[11], tmp[12], tmp[13],
	150	tmp[14], tmp[15], tmp[16], tmp[17], tmp[18], tmp[19], tmp[20],
	151	tmp[21], tmp[22], tmp[23], tmp[24], tmp[25], tmp[26], tmp[27],
	152	tmp[28], tmp[29], tmp[30], tmp[31], tmp[32], tmp[33], tmp[34],
	153	tmp[35], tmp[36], tmp[37], tmp[38], tmp[39], tmp[40], tmp[41],
	154	tmp[42], tmp[43], tmp[44], tmp[45], tmp[46], tmp[47], tmp[48],
	155	tmp[49], tmp[50], tmp[51], tmp[52], tmp[53], tmp[54], tmp[55],
	156	tmp[56], tmp[57], tmp[58], tmp[59], tmp[60], tmp[61],
	157	tmp[62]);
dc746091 TP	158
	159	return 0;
	160	}
	161
	162	static int blank(struct fbtft_par *par, bool on)
	163	{
	164	fbtft_par_dbg(DEBUG_BLANK, par, "%s(blank=%s)\n",
307a0824	165	__func__, on ? "true" : "false");
dc746091 TP	166	if (on)
	167	write_reg(par, 0xAE);
	168	else
	169	write_reg(par, 0xAF);
	170	return 0;
	171	}
	172
dc746091 TP	173	static struct fbtft_display display = {
	174	.regwidth = 8,
	175	.width = WIDTH,
	176	.height = HEIGHT,
	177	.gamma_num = GAMMA_NUM,
	178	.gamma_len = GAMMA_LEN,
	179	.gamma = DEFAULT_GAMMA,
	180	.fbtftops = {
	181	.write_register = write_reg8_bus8,
	182	.init_display = init_display,
	183	.set_addr_win = set_addr_win,
	184	.set_gamma = set_gamma,
	185	.blank = blank,
	186	},
	187	};
	188
	189	FBTFT_REGISTER_DRIVER(DRVNAME, "solomon,ssd1331", &display);
	190
	191	MODULE_ALIAS("spi:" DRVNAME);
	192	MODULE_ALIAS("platform:" DRVNAME);
	193	MODULE_ALIAS("spi:ssd1331");
	194	MODULE_ALIAS("platform:ssd1331");
	195
	196	MODULE_DESCRIPTION("SSD1331 OLED Driver");
	197	MODULE_AUTHOR("Alec Smecher (adapted from SSD1351 by James Davies)");
	198	MODULE_LICENSE("GPL");