From e5fd91f1ef340da553f7a79da9540c3db711c937 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Tue, 8 Sep 2015 01:01:14 -0300 Subject: Linux-libre 4.2-gnu --- drivers/video/fbdev/ssd1307fb.c | 289 +++++++++++++++++++++++++++++----------- 1 file changed, 208 insertions(+), 81 deletions(-) (limited to 'drivers/video/fbdev/ssd1307fb.c') diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c index f7ed6d901..3e153c061 100644 --- a/drivers/video/fbdev/ssd1307fb.c +++ b/drivers/video/fbdev/ssd1307fb.c @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -38,22 +39,43 @@ #define SSD1307FB_SET_COM_PINS_CONFIG 0xda #define SSD1307FB_SET_VCOMH 0xdb +#define MAX_CONTRAST 255 + +#define REFRESHRATE 1 + +static u_int refreshrate = REFRESHRATE; +module_param(refreshrate, uint, 0); + struct ssd1307fb_par; -struct ssd1307fb_ops { - int (*init)(struct ssd1307fb_par *); - int (*remove)(struct ssd1307fb_par *); +struct ssd1307fb_deviceinfo { + u32 default_vcomh; + u32 default_dclk_div; + u32 default_dclk_frq; + int need_pwm; + int need_chargepump; }; struct ssd1307fb_par { + u32 com_invdir; + u32 com_lrremap; + u32 com_offset; + u32 com_seq; + u32 contrast; + u32 dclk_div; + u32 dclk_frq; + struct ssd1307fb_deviceinfo *device_info; struct i2c_client *client; u32 height; struct fb_info *info; - struct ssd1307fb_ops *ops; u32 page_offset; + u32 prechargep1; + u32 prechargep2; struct pwm_device *pwm; u32 pwm_period; int reset; + u32 seg_remap; + u32 vcomh; u32 width; }; @@ -213,6 +235,16 @@ static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf, return count; } +static int ssd1307fb_blank(int blank_mode, struct fb_info *info) +{ + struct ssd1307fb_par *par = info->par; + + if (blank_mode != FB_BLANK_UNBLANK) + return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF); + else + return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON); +} + static void ssd1307fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) { struct ssd1307fb_par *par = info->par; @@ -238,6 +270,7 @@ static struct fb_ops ssd1307fb_ops = { .owner = THIS_MODULE, .fb_read = fb_sys_read, .fb_write = ssd1307fb_write, + .fb_blank = ssd1307fb_blank, .fb_fillrect = ssd1307fb_fillrect, .fb_copyarea = ssd1307fb_copyarea, .fb_imageblit = ssd1307fb_imageblit, @@ -249,74 +282,46 @@ static void ssd1307fb_deferred_io(struct fb_info *info, ssd1307fb_update_display(info->par); } -static struct fb_deferred_io ssd1307fb_defio = { - .delay = HZ, - .deferred_io = ssd1307fb_deferred_io, -}; - -static int ssd1307fb_ssd1307_init(struct ssd1307fb_par *par) +static int ssd1307fb_init(struct ssd1307fb_par *par) { int ret; + u32 precharge, dclk, com_invdir, compins; - par->pwm = pwm_get(&par->client->dev, NULL); - if (IS_ERR(par->pwm)) { - dev_err(&par->client->dev, "Could not get PWM from device tree!\n"); - return PTR_ERR(par->pwm); - } - - par->pwm_period = pwm_get_period(par->pwm); - /* Enable the PWM */ - pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period); - pwm_enable(par->pwm); - - dev_dbg(&par->client->dev, "Using PWM%d with a %dns period.\n", - par->pwm->pwm, par->pwm_period); - - /* Map column 127 of the OLED to segment 0 */ - ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON); - if (ret < 0) - return ret; - - /* Turn on the display */ - ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON); - if (ret < 0) - return ret; - - return 0; -} - -static int ssd1307fb_ssd1307_remove(struct ssd1307fb_par *par) -{ - pwm_disable(par->pwm); - pwm_put(par->pwm); - return 0; -} + if (par->device_info->need_pwm) { + par->pwm = pwm_get(&par->client->dev, NULL); + if (IS_ERR(par->pwm)) { + dev_err(&par->client->dev, "Could not get PWM from device tree!\n"); + return PTR_ERR(par->pwm); + } -static struct ssd1307fb_ops ssd1307fb_ssd1307_ops = { - .init = ssd1307fb_ssd1307_init, - .remove = ssd1307fb_ssd1307_remove, -}; + par->pwm_period = pwm_get_period(par->pwm); + /* Enable the PWM */ + pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period); + pwm_enable(par->pwm); -static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) -{ - int ret; + dev_dbg(&par->client->dev, "Using PWM%d with a %dns period.\n", + par->pwm->pwm, par->pwm_period); + }; /* Set initial contrast */ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST); if (ret < 0) return ret; - ret = ssd1307fb_write_cmd(par->client, 0x7f); - if (ret < 0) - return ret; - - /* Set COM direction */ - ret = ssd1307fb_write_cmd(par->client, 0xc8); + ret = ssd1307fb_write_cmd(par->client, par->contrast); if (ret < 0) return ret; /* Set segment re-map */ - ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON); + if (par->seg_remap) { + ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON); + if (ret < 0) + return ret; + }; + + /* Set COM direction */ + com_invdir = 0xc0 | (par->com_invdir & 0x1) << 3; + ret = ssd1307fb_write_cmd(par->client, com_invdir); if (ret < 0) return ret; @@ -334,7 +339,7 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; - ret = ssd1307fb_write_cmd(par->client, 0x20); + ret = ssd1307fb_write_cmd(par->client, par->com_offset); if (ret < 0) return ret; @@ -343,7 +348,8 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; - ret = ssd1307fb_write_cmd(par->client, 0xf0); + dclk = ((par->dclk_div - 1) & 0xf) | (par->dclk_frq & 0xf) << 4; + ret = ssd1307fb_write_cmd(par->client, dclk); if (ret < 0) return ret; @@ -352,7 +358,8 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; - ret = ssd1307fb_write_cmd(par->client, 0x22); + precharge = (par->prechargep1 & 0xf) | (par->prechargep2 & 0xf) << 4; + ret = ssd1307fb_write_cmd(par->client, precharge); if (ret < 0) return ret; @@ -361,7 +368,9 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; - ret = ssd1307fb_write_cmd(par->client, 0x22); + compins = 0x02 | !(par->com_seq & 0x1) << 4 + | (par->com_lrremap & 0x1) << 5; + ret = ssd1307fb_write_cmd(par->client, compins); if (ret < 0) return ret; @@ -370,7 +379,7 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; - ret = ssd1307fb_write_cmd(par->client, 0x49); + ret = ssd1307fb_write_cmd(par->client, par->vcomh); if (ret < 0) return ret; @@ -379,7 +388,8 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; - ret = ssd1307fb_write_cmd(par->client, 0x14); + ret = ssd1307fb_write_cmd(par->client, + (par->device_info->need_chargepump & 0x1 << 2) & 0x14); if (ret < 0) return ret; @@ -393,6 +403,7 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; + /* Set column range */ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE); if (ret < 0) return ret; @@ -405,6 +416,7 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) if (ret < 0) return ret; + /* Set page range */ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE); if (ret < 0) return ret; @@ -426,18 +438,75 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par) return 0; } -static struct ssd1307fb_ops ssd1307fb_ssd1306_ops = { - .init = ssd1307fb_ssd1306_init, +static int ssd1307fb_update_bl(struct backlight_device *bdev) +{ + struct ssd1307fb_par *par = bl_get_data(bdev); + int ret; + int brightness = bdev->props.brightness; + + par->contrast = brightness; + + ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST); + if (ret < 0) + return ret; + ret = ssd1307fb_write_cmd(par->client, par->contrast); + if (ret < 0) + return ret; + return 0; +} + +static int ssd1307fb_get_brightness(struct backlight_device *bdev) +{ + struct ssd1307fb_par *par = bl_get_data(bdev); + + return par->contrast; +} + +static int ssd1307fb_check_fb(struct backlight_device *bdev, + struct fb_info *info) +{ + return (info->bl_dev == bdev); +} + +static const struct backlight_ops ssd1307fb_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = ssd1307fb_update_bl, + .get_brightness = ssd1307fb_get_brightness, + .check_fb = ssd1307fb_check_fb, +}; + +static struct ssd1307fb_deviceinfo ssd1307fb_ssd1305_deviceinfo = { + .default_vcomh = 0x34, + .default_dclk_div = 1, + .default_dclk_frq = 7, +}; + +static struct ssd1307fb_deviceinfo ssd1307fb_ssd1306_deviceinfo = { + .default_vcomh = 0x20, + .default_dclk_div = 1, + .default_dclk_frq = 8, + .need_chargepump = 1, +}; + +static struct ssd1307fb_deviceinfo ssd1307fb_ssd1307_deviceinfo = { + .default_vcomh = 0x20, + .default_dclk_div = 2, + .default_dclk_frq = 12, + .need_pwm = 1, }; static const struct of_device_id ssd1307fb_of_match[] = { + { + .compatible = "solomon,ssd1305fb-i2c", + .data = (void *)&ssd1307fb_ssd1305_deviceinfo, + }, { .compatible = "solomon,ssd1306fb-i2c", - .data = (void *)&ssd1307fb_ssd1306_ops, + .data = (void *)&ssd1307fb_ssd1306_deviceinfo, }, { .compatible = "solomon,ssd1307fb-i2c", - .data = (void *)&ssd1307fb_ssd1307_ops, + .data = (void *)&ssd1307fb_ssd1307_deviceinfo, }, {}, }; @@ -446,8 +515,11 @@ MODULE_DEVICE_TABLE(of, ssd1307fb_of_match); static int ssd1307fb_probe(struct i2c_client *client, const struct i2c_device_id *id) { + struct backlight_device *bl; + char bl_name[12]; struct fb_info *info; struct device_node *node = client->dev.of_node; + struct fb_deferred_io *ssd1307fb_defio; u32 vmem_size; struct ssd1307fb_par *par; u8 *vmem; @@ -468,8 +540,8 @@ static int ssd1307fb_probe(struct i2c_client *client, par->info = info; par->client = client; - par->ops = (struct ssd1307fb_ops *)of_match_device(ssd1307fb_of_match, - &client->dev)->data; + par->device_info = (struct ssd1307fb_deviceinfo *)of_match_device( + ssd1307fb_of_match, &client->dev)->data; par->reset = of_get_named_gpio(client->dev.of_node, "reset-gpios", 0); @@ -487,19 +559,51 @@ static int ssd1307fb_probe(struct i2c_client *client, if (of_property_read_u32(node, "solomon,page-offset", &par->page_offset)) par->page_offset = 1; + if (of_property_read_u32(node, "solomon,com-offset", &par->com_offset)) + par->com_offset = 0; + + if (of_property_read_u32(node, "solomon,prechargep1", &par->prechargep1)) + par->prechargep1 = 2; + + if (of_property_read_u32(node, "solomon,prechargep2", &par->prechargep2)) + par->prechargep2 = 2; + + par->seg_remap = !of_property_read_bool(node, "solomon,segment-no-remap"); + par->com_seq = of_property_read_bool(node, "solomon,com-seq"); + par->com_lrremap = of_property_read_bool(node, "solomon,com-lrremap"); + par->com_invdir = of_property_read_bool(node, "solomon,com-invdir"); + + par->contrast = 127; + par->vcomh = par->device_info->default_vcomh; + + /* Setup display timing */ + par->dclk_div = par->device_info->default_dclk_div; + par->dclk_frq = par->device_info->default_dclk_frq; + vmem_size = par->width * par->height / 8; - vmem = devm_kzalloc(&client->dev, vmem_size, GFP_KERNEL); + vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, + get_order(vmem_size)); if (!vmem) { dev_err(&client->dev, "Couldn't allocate graphical memory.\n"); ret = -ENOMEM; goto fb_alloc_error; } + ssd1307fb_defio = devm_kzalloc(&client->dev, sizeof(struct fb_deferred_io), GFP_KERNEL); + if (!ssd1307fb_defio) { + dev_err(&client->dev, "Couldn't allocate deferred io.\n"); + ret = -ENOMEM; + goto fb_alloc_error; + } + + ssd1307fb_defio->delay = HZ / refreshrate; + ssd1307fb_defio->deferred_io = ssd1307fb_deferred_io; + info->fbops = &ssd1307fb_ops; info->fix = ssd1307fb_fix; info->fix.line_length = par->width / 8; - info->fbdefio = &ssd1307fb_defio; + info->fbdefio = ssd1307fb_defio; info->var = ssd1307fb_var; info->var.xres = par->width; @@ -515,7 +619,7 @@ static int ssd1307fb_probe(struct i2c_client *client, info->var.blue.offset = 0; info->screen_base = (u8 __force __iomem *)vmem; - info->fix.smem_start = (unsigned long)vmem; + info->fix.smem_start = __pa(vmem); info->fix.smem_len = vmem_size; fb_deferred_io_init(info); @@ -538,11 +642,9 @@ static int ssd1307fb_probe(struct i2c_client *client, gpio_set_value(par->reset, 1); udelay(4); - if (par->ops->init) { - ret = par->ops->init(par); - if (ret) - goto reset_oled_error; - } + ret = ssd1307fb_init(par); + if (ret) + goto reset_oled_error; ret = register_framebuffer(info); if (ret) { @@ -550,13 +652,30 @@ static int ssd1307fb_probe(struct i2c_client *client, goto panel_init_error; } + snprintf(bl_name, sizeof(bl_name), "ssd1307fb%d", info->node); + bl = backlight_device_register(bl_name, &client->dev, par, + &ssd1307fb_bl_ops, NULL); + if (IS_ERR(bl)) { + dev_err(&client->dev, "unable to register backlight device: %ld\n", + PTR_ERR(bl)); + goto bl_init_error; + } + + bl->props.brightness = par->contrast; + bl->props.max_brightness = MAX_CONTRAST; + info->bl_dev = bl; + 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; +bl_init_error: + unregister_framebuffer(info); panel_init_error: - if (par->ops->remove) - par->ops->remove(par); + if (par->device_info->need_pwm) { + pwm_disable(par->pwm); + pwm_put(par->pwm); + }; reset_oled_error: fb_deferred_io_cleanup(info); fb_alloc_error: @@ -569,16 +688,24 @@ static int ssd1307fb_remove(struct i2c_client *client) struct fb_info *info = i2c_get_clientdata(client); struct ssd1307fb_par *par = info->par; + ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF); + + backlight_device_unregister(info->bl_dev); + unregister_framebuffer(info); - if (par->ops->remove) - par->ops->remove(par); + if (par->device_info->need_pwm) { + pwm_disable(par->pwm); + pwm_put(par->pwm); + }; fb_deferred_io_cleanup(info); + __free_pages(__va(info->fix.smem_start), get_order(info->fix.smem_len)); framebuffer_release(info); return 0; } static const struct i2c_device_id ssd1307fb_i2c_id[] = { + { "ssd1305fb", 0 }, { "ssd1306fb", 0 }, { "ssd1307fb", 0 }, { } -- cgit v1.2.3-54-g00ecf