2012-12-07 13:30:38 -07:00
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/*
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2013-04-08 11:06:50 -06:00
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* Driver for the Solomon SSD1307 OLED controller
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2012-12-07 13:30:38 -07:00
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*
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* Copyright 2012 Free Electrons
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*
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* Licensed under the GPLv2 or later.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/fb.h>
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#include <linux/uaccess.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/pwm.h>
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#include <linux/delay.h>
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#define SSD1307FB_WIDTH 96
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#define SSD1307FB_HEIGHT 16
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#define SSD1307FB_DATA 0x40
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#define SSD1307FB_COMMAND 0x80
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#define SSD1307FB_CONTRAST 0x81
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#define SSD1307FB_SEG_REMAP_ON 0xa1
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#define SSD1307FB_DISPLAY_OFF 0xae
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#define SSD1307FB_DISPLAY_ON 0xaf
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#define SSD1307FB_START_PAGE_ADDRESS 0xb0
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struct ssd1307fb_par {
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struct i2c_client *client;
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struct fb_info *info;
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struct pwm_device *pwm;
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u32 pwm_period;
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int reset;
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};
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2012-12-21 14:07:39 -07:00
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static struct fb_fix_screeninfo ssd1307fb_fix = {
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2012-12-07 13:30:38 -07:00
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.id = "Solomon SSD1307",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_MONO10,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.line_length = SSD1307FB_WIDTH / 8,
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.accel = FB_ACCEL_NONE,
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};
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2012-12-21 14:07:39 -07:00
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static struct fb_var_screeninfo ssd1307fb_var = {
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2012-12-07 13:30:38 -07:00
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.xres = SSD1307FB_WIDTH,
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.yres = SSD1307FB_HEIGHT,
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.xres_virtual = SSD1307FB_WIDTH,
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.yres_virtual = SSD1307FB_HEIGHT,
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.bits_per_pixel = 1,
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};
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static int ssd1307fb_write_array(struct i2c_client *client, u8 type, u8 *cmd, u32 len)
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{
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u8 *buf;
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int ret = 0;
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buf = kzalloc(len + 1, GFP_KERNEL);
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if (!buf) {
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dev_err(&client->dev, "Couldn't allocate sending buffer.\n");
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return -ENOMEM;
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}
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buf[0] = type;
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memcpy(buf + 1, cmd, len);
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ret = i2c_master_send(client, buf, len + 1);
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if (ret != len + 1) {
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dev_err(&client->dev, "Couldn't send I2C command.\n");
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goto error;
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}
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error:
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kfree(buf);
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return ret;
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}
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static inline int ssd1307fb_write_cmd_array(struct i2c_client *client, u8 *cmd, u32 len)
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{
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return ssd1307fb_write_array(client, SSD1307FB_COMMAND, cmd, len);
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}
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static inline int ssd1307fb_write_cmd(struct i2c_client *client, u8 cmd)
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{
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return ssd1307fb_write_cmd_array(client, &cmd, 1);
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}
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static inline int ssd1307fb_write_data_array(struct i2c_client *client, u8 *cmd, u32 len)
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{
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return ssd1307fb_write_array(client, SSD1307FB_DATA, cmd, len);
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}
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static inline int ssd1307fb_write_data(struct i2c_client *client, u8 data)
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{
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return ssd1307fb_write_data_array(client, &data, 1);
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}
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static void ssd1307fb_update_display(struct ssd1307fb_par *par)
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{
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u8 *vmem = par->info->screen_base;
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int i, j, k;
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/*
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* The screen is divided in pages, each having a height of 8
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* pixels, and the width of the screen. When sending a byte of
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* data to the controller, it gives the 8 bits for the current
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* column. I.e, the first byte are the 8 bits of the first
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* column, then the 8 bits for the second column, etc.
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*
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*
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* Representation of the screen, assuming it is 5 bits
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* wide. Each letter-number combination is a bit that controls
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* one pixel.
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*
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* A0 A1 A2 A3 A4
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* B0 B1 B2 B3 B4
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* C0 C1 C2 C3 C4
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* D0 D1 D2 D3 D4
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* E0 E1 E2 E3 E4
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* F0 F1 F2 F3 F4
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* G0 G1 G2 G3 G4
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* H0 H1 H2 H3 H4
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*
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* If you want to update this screen, you need to send 5 bytes:
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* (1) A0 B0 C0 D0 E0 F0 G0 H0
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* (2) A1 B1 C1 D1 E1 F1 G1 H1
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* (3) A2 B2 C2 D2 E2 F2 G2 H2
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* (4) A3 B3 C3 D3 E3 F3 G3 H3
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* (5) A4 B4 C4 D4 E4 F4 G4 H4
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*/
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for (i = 0; i < (SSD1307FB_HEIGHT / 8); i++) {
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ssd1307fb_write_cmd(par->client, SSD1307FB_START_PAGE_ADDRESS + (i + 1));
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ssd1307fb_write_cmd(par->client, 0x00);
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ssd1307fb_write_cmd(par->client, 0x10);
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for (j = 0; j < SSD1307FB_WIDTH; j++) {
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u8 buf = 0;
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for (k = 0; k < 8; k++) {
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u32 page_length = SSD1307FB_WIDTH * i;
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u32 index = page_length + (SSD1307FB_WIDTH * k + j) / 8;
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u8 byte = *(vmem + index);
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2013-01-11 15:31:43 -07:00
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u8 bit = byte & (1 << (j % 8));
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bit = bit >> (j % 8);
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2012-12-07 13:30:38 -07:00
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buf |= bit << k;
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}
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ssd1307fb_write_data(par->client, buf);
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}
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}
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}
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static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct ssd1307fb_par *par = info->par;
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unsigned long total_size;
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unsigned long p = *ppos;
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u8 __iomem *dst;
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total_size = info->fix.smem_len;
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if (p > total_size)
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return -EINVAL;
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if (count + p > total_size)
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count = total_size - p;
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if (!count)
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return -EINVAL;
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dst = (void __force *) (info->screen_base + p);
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if (copy_from_user(dst, buf, count))
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return -EFAULT;
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ssd1307fb_update_display(par);
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*ppos += count;
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return count;
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}
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static void ssd1307fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
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{
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struct ssd1307fb_par *par = info->par;
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sys_fillrect(info, rect);
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ssd1307fb_update_display(par);
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}
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static void ssd1307fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
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{
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struct ssd1307fb_par *par = info->par;
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sys_copyarea(info, area);
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ssd1307fb_update_display(par);
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}
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static void ssd1307fb_imageblit(struct fb_info *info, const struct fb_image *image)
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{
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struct ssd1307fb_par *par = info->par;
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sys_imageblit(info, image);
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ssd1307fb_update_display(par);
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}
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static struct fb_ops ssd1307fb_ops = {
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.owner = THIS_MODULE,
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.fb_read = fb_sys_read,
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.fb_write = ssd1307fb_write,
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.fb_fillrect = ssd1307fb_fillrect,
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.fb_copyarea = ssd1307fb_copyarea,
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.fb_imageblit = ssd1307fb_imageblit,
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};
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static void ssd1307fb_deferred_io(struct fb_info *info,
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struct list_head *pagelist)
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{
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ssd1307fb_update_display(info->par);
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}
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static struct fb_deferred_io ssd1307fb_defio = {
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.delay = HZ,
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.deferred_io = ssd1307fb_deferred_io,
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};
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2012-12-21 14:07:39 -07:00
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static int ssd1307fb_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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2012-12-07 13:30:38 -07:00
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{
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struct fb_info *info;
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u32 vmem_size = SSD1307FB_WIDTH * SSD1307FB_HEIGHT / 8;
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struct ssd1307fb_par *par;
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u8 *vmem;
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int ret;
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if (!client->dev.of_node) {
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dev_err(&client->dev, "No device tree data found!\n");
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return -EINVAL;
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}
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info = framebuffer_alloc(sizeof(struct ssd1307fb_par), &client->dev);
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if (!info) {
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dev_err(&client->dev, "Couldn't allocate framebuffer.\n");
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return -ENOMEM;
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}
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vmem = devm_kzalloc(&client->dev, vmem_size, GFP_KERNEL);
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if (!vmem) {
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dev_err(&client->dev, "Couldn't allocate graphical memory.\n");
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ret = -ENOMEM;
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goto fb_alloc_error;
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}
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info->fbops = &ssd1307fb_ops;
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info->fix = ssd1307fb_fix;
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info->fbdefio = &ssd1307fb_defio;
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info->var = ssd1307fb_var;
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info->var.red.length = 1;
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info->var.red.offset = 0;
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info->var.green.length = 1;
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info->var.green.offset = 0;
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info->var.blue.length = 1;
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info->var.blue.offset = 0;
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info->screen_base = (u8 __force __iomem *)vmem;
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info->fix.smem_start = (unsigned long)vmem;
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info->fix.smem_len = vmem_size;
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fb_deferred_io_init(info);
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par = info->par;
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par->info = info;
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par->client = client;
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par->reset = of_get_named_gpio(client->dev.of_node,
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"reset-gpios", 0);
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if (!gpio_is_valid(par->reset)) {
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ret = -EINVAL;
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goto reset_oled_error;
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}
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ret = devm_gpio_request_one(&client->dev, par->reset,
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GPIOF_OUT_INIT_HIGH,
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"oled-reset");
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if (ret) {
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dev_err(&client->dev,
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"failed to request gpio %d: %d\n",
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par->reset, ret);
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goto reset_oled_error;
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}
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par->pwm = pwm_get(&client->dev, NULL);
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if (IS_ERR(par->pwm)) {
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dev_err(&client->dev, "Could not get PWM from device tree!\n");
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ret = PTR_ERR(par->pwm);
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goto pwm_error;
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}
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par->pwm_period = pwm_get_period(par->pwm);
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dev_dbg(&client->dev, "Using PWM%d with a %dns period.\n", par->pwm->pwm, par->pwm_period);
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ret = register_framebuffer(info);
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if (ret) {
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dev_err(&client->dev, "Couldn't register the framebuffer\n");
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goto fbreg_error;
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}
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i2c_set_clientdata(client, info);
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/* Reset the screen */
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gpio_set_value(par->reset, 0);
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udelay(4);
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gpio_set_value(par->reset, 1);
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udelay(4);
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/* Enable the PWM */
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pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period);
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pwm_enable(par->pwm);
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/* Map column 127 of the OLED to segment 0 */
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ret = ssd1307fb_write_cmd(client, SSD1307FB_SEG_REMAP_ON);
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if (ret < 0) {
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dev_err(&client->dev, "Couldn't remap the screen.\n");
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goto remap_error;
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}
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/* Turn on the display */
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ret = ssd1307fb_write_cmd(client, SSD1307FB_DISPLAY_ON);
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if (ret < 0) {
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dev_err(&client->dev, "Couldn't turn the display on.\n");
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goto remap_error;
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}
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dev_info(&client->dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size);
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return 0;
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remap_error:
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unregister_framebuffer(info);
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pwm_disable(par->pwm);
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fbreg_error:
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pwm_put(par->pwm);
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pwm_error:
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reset_oled_error:
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fb_deferred_io_cleanup(info);
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fb_alloc_error:
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framebuffer_release(info);
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return ret;
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}
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2012-12-21 14:07:39 -07:00
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static int ssd1307fb_remove(struct i2c_client *client)
|
2012-12-07 13:30:38 -07:00
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{
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struct fb_info *info = i2c_get_clientdata(client);
|
|
|
|
struct ssd1307fb_par *par = info->par;
|
|
|
|
|
|
|
|
unregister_framebuffer(info);
|
|
|
|
pwm_disable(par->pwm);
|
|
|
|
pwm_put(par->pwm);
|
|
|
|
fb_deferred_io_cleanup(info);
|
|
|
|
framebuffer_release(info);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct i2c_device_id ssd1307fb_i2c_id[] = {
|
|
|
|
{ "ssd1307fb", 0 },
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ssd1307fb_i2c_id);
|
|
|
|
|
|
|
|
static const struct of_device_id ssd1307fb_of_match[] = {
|
|
|
|
{ .compatible = "solomon,ssd1307fb-i2c" },
|
|
|
|
{},
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, ssd1307fb_of_match);
|
|
|
|
|
|
|
|
static struct i2c_driver ssd1307fb_driver = {
|
|
|
|
.probe = ssd1307fb_probe,
|
2012-12-21 14:07:39 -07:00
|
|
|
.remove = ssd1307fb_remove,
|
2012-12-07 13:30:38 -07:00
|
|
|
.id_table = ssd1307fb_i2c_id,
|
|
|
|
.driver = {
|
|
|
|
.name = "ssd1307fb",
|
|
|
|
.of_match_table = of_match_ptr(ssd1307fb_of_match),
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
module_i2c_driver(ssd1307fb_driver);
|
|
|
|
|
2013-04-08 11:06:50 -06:00
|
|
|
MODULE_DESCRIPTION("FB driver for the Solomon SSD1307 OLED controller");
|
2012-12-07 13:30:38 -07:00
|
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|