diff options
Diffstat (limited to 'drivers/video/ssd1307fb.c')
| -rw-r--r-- | drivers/video/ssd1307fb.c | 397 |
1 files changed, 0 insertions, 397 deletions
diff --git a/drivers/video/ssd1307fb.c b/drivers/video/ssd1307fb.c deleted file mode 100644 index 395cb6a8d8f..00000000000 --- a/drivers/video/ssd1307fb.c +++ /dev/null @@ -1,397 +0,0 @@ -/* - * Driver for the Solomon SSD1307 OLED controler - * - * Copyright 2012 Free Electrons - * - * Licensed under the GPLv2 or later. - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/i2c.h> -#include <linux/fb.h> -#include <linux/uaccess.h> -#include <linux/of_device.h> -#include <linux/of_gpio.h> -#include <linux/pwm.h> -#include <linux/delay.h> - -#define SSD1307FB_WIDTH 96 -#define SSD1307FB_HEIGHT 16 - -#define SSD1307FB_DATA 0x40 -#define SSD1307FB_COMMAND 0x80 - -#define SSD1307FB_CONTRAST 0x81 -#define SSD1307FB_SEG_REMAP_ON 0xa1 -#define SSD1307FB_DISPLAY_OFF 0xae -#define SSD1307FB_DISPLAY_ON 0xaf -#define SSD1307FB_START_PAGE_ADDRESS 0xb0 - -struct ssd1307fb_par { - struct i2c_client *client; - struct fb_info *info; - struct pwm_device *pwm; - u32 pwm_period; - int reset; -}; - -static struct fb_fix_screeninfo ssd1307fb_fix = { - .id = "Solomon SSD1307", - .type = FB_TYPE_PACKED_PIXELS, - .visual = FB_VISUAL_MONO10, - .xpanstep = 0, - .ypanstep = 0, - .ywrapstep = 0, - .line_length = SSD1307FB_WIDTH / 8, - .accel = FB_ACCEL_NONE, -}; - -static struct fb_var_screeninfo ssd1307fb_var = { - .xres = SSD1307FB_WIDTH, - .yres = SSD1307FB_HEIGHT, - .xres_virtual = SSD1307FB_WIDTH, - .yres_virtual = SSD1307FB_HEIGHT, - .bits_per_pixel = 1, -}; - -static int ssd1307fb_write_array(struct i2c_client *client, u8 type, u8 *cmd, u32 len) -{ - u8 *buf; - int ret = 0; - - buf = kzalloc(len + 1, GFP_KERNEL); - if (!buf) { - dev_err(&client->dev, "Couldn't allocate sending buffer.\n"); - return -ENOMEM; - } - - buf[0] = type; - memcpy(buf + 1, cmd, len); - - ret = i2c_master_send(client, buf, len + 1); - if (ret != len + 1) { - dev_err(&client->dev, "Couldn't send I2C command.\n"); - goto error; - } - -error: - kfree(buf); - return ret; -} - -static inline int ssd1307fb_write_cmd_array(struct i2c_client *client, u8 *cmd, u32 len) -{ - return ssd1307fb_write_array(client, SSD1307FB_COMMAND, cmd, len); -} - -static inline int ssd1307fb_write_cmd(struct i2c_client *client, u8 cmd) -{ - return ssd1307fb_write_cmd_array(client, &cmd, 1); -} - -static inline int ssd1307fb_write_data_array(struct i2c_client *client, u8 *cmd, u32 len) -{ - return ssd1307fb_write_array(client, SSD1307FB_DATA, cmd, len); -} - -static inline int ssd1307fb_write_data(struct i2c_client *client, u8 data) -{ - return ssd1307fb_write_data_array(client, &data, 1); -} - -static void ssd1307fb_update_display(struct ssd1307fb_par *par) -{ - u8 *vmem = par->info->screen_base; - int i, j, k; - - /* - * The screen is divided in pages, each having a height of 8 - * pixels, and the width of the screen. When sending a byte of - * data to the controller, it gives the 8 bits for the current - * column. I.e, the first byte are the 8 bits of the first - * column, then the 8 bits for the second column, etc. - * - * - * Representation of the screen, assuming it is 5 bits - * wide. Each letter-number combination is a bit that controls - * one pixel. - * - * A0 A1 A2 A3 A4 - * B0 B1 B2 B3 B4 - * C0 C1 C2 C3 C4 - * D0 D1 D2 D3 D4 - * E0 E1 E2 E3 E4 - * F0 F1 F2 F3 F4 - * G0 G1 G2 G3 G4 - * H0 H1 H2 H3 H4 - * - * If you want to update this screen, you need to send 5 bytes: - * (1) A0 B0 C0 D0 E0 F0 G0 H0 - * (2) A1 B1 C1 D1 E1 F1 G1 H1 - * (3) A2 B2 C2 D2 E2 F2 G2 H2 - * (4) A3 B3 C3 D3 E3 F3 G3 H3 - * (5) A4 B4 C4 D4 E4 F4 G4 H4 - */ - - for (i = 0; i < (SSD1307FB_HEIGHT / 8); i++) { - ssd1307fb_write_cmd(par->client, SSD1307FB_START_PAGE_ADDRESS + (i + 1)); - ssd1307fb_write_cmd(par->client, 0x00); - ssd1307fb_write_cmd(par->client, 0x10); - - for (j = 0; j < SSD1307FB_WIDTH; j++) { - u8 buf = 0; - for (k = 0; k < 8; k++) { - u32 page_length = SSD1307FB_WIDTH * i; - u32 index = page_length + (SSD1307FB_WIDTH * k + j) / 8; - u8 byte = *(vmem + index); - u8 bit = byte & (1 << (j % 8)); - bit = bit >> (j % 8); - buf |= bit << k; - } - ssd1307fb_write_data(par->client, buf); - } - } -} - - -static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf, - size_t count, loff_t *ppos) -{ - struct ssd1307fb_par *par = info->par; - unsigned long total_size; - unsigned long p = *ppos; - u8 __iomem *dst; - - total_size = info->fix.smem_len; - - if (p > total_size) - return -EINVAL; - - if (count + p > total_size) - count = total_size - p; - - if (!count) - return -EINVAL; - - dst = (void __force *) (info->screen_base + p); - - if (copy_from_user(dst, buf, count)) - return -EFAULT; - - ssd1307fb_update_display(par); - - *ppos += count; - - return count; -} - -static void ssd1307fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) -{ - struct ssd1307fb_par *par = info->par; - sys_fillrect(info, rect); - ssd1307fb_update_display(par); -} - -static void ssd1307fb_copyarea(struct fb_info *info, const struct fb_copyarea *area) -{ - struct ssd1307fb_par *par = info->par; - sys_copyarea(info, area); - ssd1307fb_update_display(par); -} - -static void ssd1307fb_imageblit(struct fb_info *info, const struct fb_image *image) -{ - struct ssd1307fb_par *par = info->par; - sys_imageblit(info, image); - ssd1307fb_update_display(par); -} - -static struct fb_ops ssd1307fb_ops = { - .owner = THIS_MODULE, - .fb_read = fb_sys_read, - .fb_write = ssd1307fb_write, - .fb_fillrect = ssd1307fb_fillrect, - .fb_copyarea = ssd1307fb_copyarea, - .fb_imageblit = ssd1307fb_imageblit, -}; - -static void ssd1307fb_deferred_io(struct fb_info *info, - struct list_head *pagelist) -{ - ssd1307fb_update_display(info->par); -} - -static struct fb_deferred_io ssd1307fb_defio = { - .delay = HZ, - .deferred_io = ssd1307fb_deferred_io, -}; - -static int ssd1307fb_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct fb_info *info; - u32 vmem_size = SSD1307FB_WIDTH * SSD1307FB_HEIGHT / 8; - struct ssd1307fb_par *par; - u8 *vmem; - int ret; - - if (!client->dev.of_node) { - dev_err(&client->dev, "No device tree data found!\n"); - return -EINVAL; - } - - info = framebuffer_alloc(sizeof(struct ssd1307fb_par), &client->dev); - if (!info) { - dev_err(&client->dev, "Couldn't allocate framebuffer.\n"); - return -ENOMEM; - } - - vmem = devm_kzalloc(&client->dev, vmem_size, GFP_KERNEL); - if (!vmem) { - dev_err(&client->dev, "Couldn't allocate graphical memory.\n"); - ret = -ENOMEM; - goto fb_alloc_error; - } - - info->fbops = &ssd1307fb_ops; - info->fix = ssd1307fb_fix; - info->fbdefio = &ssd1307fb_defio; - - info->var = ssd1307fb_var; - info->var.red.length = 1; - info->var.red.offset = 0; - info->var.green.length = 1; - info->var.green.offset = 0; - info->var.blue.length = 1; - info->var.blue.offset = 0; - - info->screen_base = (u8 __force __iomem *)vmem; - info->fix.smem_start = (unsigned long)vmem; - info->fix.smem_len = vmem_size; - - fb_deferred_io_init(info); - - par = info->par; - par->info = info; - par->client = client; - - par->reset = of_get_named_gpio(client->dev.of_node, - "reset-gpios", 0); - if (!gpio_is_valid(par->reset)) { - ret = -EINVAL; - goto reset_oled_error; - } - - ret = devm_gpio_request_one(&client->dev, par->reset, - GPIOF_OUT_INIT_HIGH, - "oled-reset"); - if (ret) { - dev_err(&client->dev, - "failed to request gpio %d: %d\n", - par->reset, ret); - goto reset_oled_error; - } - - par->pwm = pwm_get(&client->dev, NULL); - if (IS_ERR(par->pwm)) { - dev_err(&client->dev, "Could not get PWM from device tree!\n"); - ret = PTR_ERR(par->pwm); - goto pwm_error; - } - - par->pwm_period = pwm_get_period(par->pwm); - - dev_dbg(&client->dev, "Using PWM%d with a %dns period.\n", par->pwm->pwm, par->pwm_period); - - ret = register_framebuffer(info); - if (ret) { - dev_err(&client->dev, "Couldn't register the framebuffer\n"); - goto fbreg_error; - } - - i2c_set_clientdata(client, info); - - /* Reset the screen */ - gpio_set_value(par->reset, 0); - udelay(4); - gpio_set_value(par->reset, 1); - udelay(4); - - /* Enable the PWM */ - pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period); - pwm_enable(par->pwm); - - /* Map column 127 of the OLED to segment 0 */ - ret = ssd1307fb_write_cmd(client, SSD1307FB_SEG_REMAP_ON); - if (ret < 0) { - dev_err(&client->dev, "Couldn't remap the screen.\n"); - goto remap_error; - } - - /* Turn on the display */ - ret = ssd1307fb_write_cmd(client, SSD1307FB_DISPLAY_ON); - if (ret < 0) { - dev_err(&client->dev, "Couldn't turn the display on.\n"); - goto remap_error; - } - - dev_info(&client->dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size); - - return 0; - -remap_error: - unregister_framebuffer(info); - pwm_disable(par->pwm); -fbreg_error: - pwm_put(par->pwm); -pwm_error: -reset_oled_error: - fb_deferred_io_cleanup(info); -fb_alloc_error: - framebuffer_release(info); - return ret; -} - -static int ssd1307fb_remove(struct i2c_client *client) -{ - 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, - .remove = ssd1307fb_remove, - .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); - -MODULE_DESCRIPTION("FB driver for the Solomon SSD1307 OLED controler"); -MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); -MODULE_LICENSE("GPL"); |