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304d63d4d8
There is no need to have forward declaration of struct ssd1307fb_par. Drop it for good. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200324170532.44384-5-andriy.shevchenko@linux.intel.com
807 lines
20 KiB
C
807 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for the Solomon SSD1307 OLED controller
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*
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* Copyright 2012 Free Electrons
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*/
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/fb.h>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/pwm.h>
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#include <linux/uaccess.h>
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#include <linux/regulator/consumer.h>
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#define SSD1307FB_DATA 0x40
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#define SSD1307FB_COMMAND 0x80
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#define SSD1307FB_SET_ADDRESS_MODE 0x20
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#define SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL (0x00)
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#define SSD1307FB_SET_ADDRESS_MODE_VERTICAL (0x01)
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#define SSD1307FB_SET_ADDRESS_MODE_PAGE (0x02)
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#define SSD1307FB_SET_COL_RANGE 0x21
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#define SSD1307FB_SET_PAGE_RANGE 0x22
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#define SSD1307FB_CONTRAST 0x81
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#define SSD1307FB_SET_LOOKUP_TABLE 0x91
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#define SSD1307FB_CHARGE_PUMP 0x8d
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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_SET_MULTIPLEX_RATIO 0xa8
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#define SSD1307FB_DISPLAY_ON 0xaf
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#define SSD1307FB_START_PAGE_ADDRESS 0xb0
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#define SSD1307FB_SET_DISPLAY_OFFSET 0xd3
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#define SSD1307FB_SET_CLOCK_FREQ 0xd5
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#define SSD1307FB_SET_AREA_COLOR_MODE 0xd8
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#define SSD1307FB_SET_PRECHARGE_PERIOD 0xd9
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#define SSD1307FB_SET_COM_PINS_CONFIG 0xda
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#define SSD1307FB_SET_VCOMH 0xdb
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#define MAX_CONTRAST 255
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#define REFRESHRATE 1
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static u_int refreshrate = REFRESHRATE;
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module_param(refreshrate, uint, 0);
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struct ssd1307fb_deviceinfo {
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u32 default_vcomh;
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u32 default_dclk_div;
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u32 default_dclk_frq;
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int need_pwm;
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int need_chargepump;
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};
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struct ssd1307fb_par {
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unsigned area_color_enable : 1;
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unsigned com_invdir : 1;
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unsigned com_lrremap : 1;
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unsigned com_seq : 1;
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unsigned lookup_table_set : 1;
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unsigned low_power : 1;
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unsigned seg_remap : 1;
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u32 com_offset;
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u32 contrast;
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u32 dclk_div;
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u32 dclk_frq;
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const struct ssd1307fb_deviceinfo *device_info;
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struct i2c_client *client;
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u32 height;
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struct fb_info *info;
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u8 lookup_table[4];
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u32 page_offset;
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u32 prechargep1;
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u32 prechargep2;
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struct pwm_device *pwm;
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struct gpio_desc *reset;
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struct regulator *vbat_reg;
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u32 vcomh;
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u32 width;
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};
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struct ssd1307fb_array {
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u8 type;
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u8 data[];
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};
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static const struct fb_fix_screeninfo ssd1307fb_fix = {
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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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.accel = FB_ACCEL_NONE,
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};
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static const struct fb_var_screeninfo ssd1307fb_var = {
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.bits_per_pixel = 1,
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.red = { .length = 1 },
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.green = { .length = 1 },
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.blue = { .length = 1 },
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};
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static struct ssd1307fb_array *ssd1307fb_alloc_array(u32 len, u8 type)
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{
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struct ssd1307fb_array *array;
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array = kzalloc(sizeof(struct ssd1307fb_array) + len, GFP_KERNEL);
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if (!array)
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return NULL;
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array->type = type;
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return array;
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}
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static int ssd1307fb_write_array(struct i2c_client *client,
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struct ssd1307fb_array *array, u32 len)
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{
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int ret;
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len += sizeof(struct ssd1307fb_array);
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ret = i2c_master_send(client, (u8 *)array, len);
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if (ret != len) {
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dev_err(&client->dev, "Couldn't send I2C command.\n");
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return ret;
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}
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return 0;
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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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struct ssd1307fb_array *array;
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int ret;
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array = ssd1307fb_alloc_array(1, SSD1307FB_COMMAND);
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if (!array)
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return -ENOMEM;
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array->data[0] = cmd;
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ret = ssd1307fb_write_array(client, array, 1);
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kfree(array);
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return ret;
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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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struct ssd1307fb_array *array;
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u8 *vmem = par->info->screen_buffer;
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unsigned int line_length = par->info->fix.line_length;
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unsigned int pages = DIV_ROUND_UP(par->height, 8);
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int i, j, k;
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array = ssd1307fb_alloc_array(par->width * pages, SSD1307FB_DATA);
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if (!array)
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return;
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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 < pages; i++) {
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for (j = 0; j < par->width; j++) {
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int m = 8;
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u32 array_idx = i * par->width + j;
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array->data[array_idx] = 0;
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/* Last page may be partial */
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if (i + 1 == pages && par->height % 8)
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m = par->height % 8;
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for (k = 0; k < m; k++) {
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u8 byte = vmem[(8 * i + k) * line_length +
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j / 8];
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u8 bit = (byte >> (j % 8)) & 1;
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array->data[array_idx] |= bit << k;
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}
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}
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}
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ssd1307fb_write_array(par->client, array, par->width * pages);
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kfree(array);
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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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void *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 = info->screen_buffer + 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 int ssd1307fb_blank(int blank_mode, struct fb_info *info)
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{
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struct ssd1307fb_par *par = info->par;
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if (blank_mode != FB_BLANK_UNBLANK)
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return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF);
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else
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return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON);
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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 const 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_blank = ssd1307fb_blank,
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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 int ssd1307fb_init(struct ssd1307fb_par *par)
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{
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struct pwm_state pwmstate;
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int ret;
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u32 precharge, dclk, com_invdir, compins;
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if (par->device_info->need_pwm) {
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par->pwm = pwm_get(&par->client->dev, NULL);
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if (IS_ERR(par->pwm)) {
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dev_err(&par->client->dev, "Could not get PWM from device tree!\n");
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return PTR_ERR(par->pwm);
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}
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pwm_init_state(par->pwm, &pwmstate);
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pwm_set_relative_duty_cycle(&pwmstate, 50, 100);
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pwm_apply_state(par->pwm, &pwmstate);
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/* Enable the PWM */
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pwm_enable(par->pwm);
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dev_dbg(&par->client->dev, "Using PWM%d with a %dns period.\n",
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par->pwm->pwm, pwm_get_period(par->pwm));
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}
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/* Set initial contrast */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client, par->contrast);
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if (ret < 0)
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return ret;
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/* Set segment re-map */
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if (par->seg_remap) {
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON);
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if (ret < 0)
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return ret;
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}
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/* Set COM direction */
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com_invdir = 0xc0 | par->com_invdir << 3;
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ret = ssd1307fb_write_cmd(par->client, com_invdir);
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if (ret < 0)
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return ret;
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/* Set multiplex ratio value */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_MULTIPLEX_RATIO);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client, par->height - 1);
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if (ret < 0)
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return ret;
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/* set display offset value */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_DISPLAY_OFFSET);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client, par->com_offset);
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if (ret < 0)
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return ret;
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/* Set clock frequency */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_CLOCK_FREQ);
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if (ret < 0)
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return ret;
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dclk = ((par->dclk_div - 1) & 0xf) | (par->dclk_frq & 0xf) << 4;
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ret = ssd1307fb_write_cmd(par->client, dclk);
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if (ret < 0)
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return ret;
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/* Set Set Area Color Mode ON/OFF & Low Power Display Mode */
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if (par->area_color_enable || par->low_power) {
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u32 mode;
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ret = ssd1307fb_write_cmd(par->client,
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SSD1307FB_SET_AREA_COLOR_MODE);
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if (ret < 0)
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return ret;
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mode = (par->area_color_enable ? 0x30 : 0) |
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(par->low_power ? 5 : 0);
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ret = ssd1307fb_write_cmd(par->client, mode);
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if (ret < 0)
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return ret;
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}
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/* Set precharge period in number of ticks from the internal clock */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PRECHARGE_PERIOD);
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if (ret < 0)
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return ret;
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precharge = (par->prechargep1 & 0xf) | (par->prechargep2 & 0xf) << 4;
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ret = ssd1307fb_write_cmd(par->client, precharge);
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if (ret < 0)
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return ret;
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/* Set COM pins configuration */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COM_PINS_CONFIG);
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if (ret < 0)
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return ret;
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compins = 0x02 | !par->com_seq << 4 | par->com_lrremap << 5;
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ret = ssd1307fb_write_cmd(par->client, compins);
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if (ret < 0)
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return ret;
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/* Set VCOMH */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_VCOMH);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client, par->vcomh);
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if (ret < 0)
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return ret;
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/* Turn on the DC-DC Charge Pump */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CHARGE_PUMP);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client,
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BIT(4) | (par->device_info->need_chargepump ? BIT(2) : 0));
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if (ret < 0)
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return ret;
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/* Set lookup table */
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if (par->lookup_table_set) {
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int i;
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ret = ssd1307fb_write_cmd(par->client,
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SSD1307FB_SET_LOOKUP_TABLE);
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if (ret < 0)
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return ret;
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for (i = 0; i < ARRAY_SIZE(par->lookup_table); ++i) {
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u8 val = par->lookup_table[i];
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if (val < 31 || val > 63)
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dev_warn(&par->client->dev,
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"lookup table index %d value out of range 31 <= %d <= 63\n",
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i, val);
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ret = ssd1307fb_write_cmd(par->client, val);
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if (ret < 0)
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return ret;
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}
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}
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/* Switch to horizontal addressing mode */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_ADDRESS_MODE);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client,
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SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL);
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if (ret < 0)
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return ret;
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/* Set column range */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client, 0x0);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client, par->width - 1);
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if (ret < 0)
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return ret;
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/* Set page range */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client, par->page_offset);
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if (ret < 0)
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return ret;
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ret = ssd1307fb_write_cmd(par->client,
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par->page_offset +
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DIV_ROUND_UP(par->height, 8) - 1);
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if (ret < 0)
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return ret;
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/* Clear the screen */
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ssd1307fb_update_display(par);
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/* Turn on the display */
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ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON);
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if (ret < 0)
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return ret;
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return 0;
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}
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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 struct ssd1307fb_deviceinfo ssd1307fb_ssd1309_deviceinfo = {
|
|
.default_vcomh = 0x34,
|
|
.default_dclk_div = 1,
|
|
.default_dclk_frq = 10,
|
|
};
|
|
|
|
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_deviceinfo,
|
|
},
|
|
{
|
|
.compatible = "solomon,ssd1307fb-i2c",
|
|
.data = (void *)&ssd1307fb_ssd1307_deviceinfo,
|
|
},
|
|
{
|
|
.compatible = "solomon,ssd1309fb-i2c",
|
|
.data = (void *)&ssd1307fb_ssd1309_deviceinfo,
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ssd1307fb_of_match);
|
|
|
|
static int ssd1307fb_probe(struct i2c_client *client)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
struct backlight_device *bl;
|
|
char bl_name[12];
|
|
struct fb_info *info;
|
|
struct fb_deferred_io *ssd1307fb_defio;
|
|
u32 vmem_size;
|
|
struct ssd1307fb_par *par;
|
|
void *vmem;
|
|
int ret;
|
|
|
|
info = framebuffer_alloc(sizeof(struct ssd1307fb_par), dev);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
par = info->par;
|
|
par->info = info;
|
|
par->client = client;
|
|
|
|
par->device_info = device_get_match_data(dev);
|
|
|
|
par->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
|
|
if (IS_ERR(par->reset)) {
|
|
dev_err(dev, "failed to get reset gpio: %ld\n",
|
|
PTR_ERR(par->reset));
|
|
ret = PTR_ERR(par->reset);
|
|
goto fb_alloc_error;
|
|
}
|
|
|
|
par->vbat_reg = devm_regulator_get_optional(dev, "vbat");
|
|
if (IS_ERR(par->vbat_reg)) {
|
|
ret = PTR_ERR(par->vbat_reg);
|
|
if (ret == -ENODEV) {
|
|
par->vbat_reg = NULL;
|
|
} else {
|
|
dev_err(dev, "failed to get VBAT regulator: %d\n", ret);
|
|
goto fb_alloc_error;
|
|
}
|
|
}
|
|
|
|
if (device_property_read_u32(dev, "solomon,width", &par->width))
|
|
par->width = 96;
|
|
|
|
if (device_property_read_u32(dev, "solomon,height", &par->height))
|
|
par->height = 16;
|
|
|
|
if (device_property_read_u32(dev, "solomon,page-offset", &par->page_offset))
|
|
par->page_offset = 1;
|
|
|
|
if (device_property_read_u32(dev, "solomon,com-offset", &par->com_offset))
|
|
par->com_offset = 0;
|
|
|
|
if (device_property_read_u32(dev, "solomon,prechargep1", &par->prechargep1))
|
|
par->prechargep1 = 2;
|
|
|
|
if (device_property_read_u32(dev, "solomon,prechargep2", &par->prechargep2))
|
|
par->prechargep2 = 2;
|
|
|
|
if (!device_property_read_u8_array(dev, "solomon,lookup-table",
|
|
par->lookup_table,
|
|
ARRAY_SIZE(par->lookup_table)))
|
|
par->lookup_table_set = 1;
|
|
|
|
par->seg_remap = !device_property_read_bool(dev, "solomon,segment-no-remap");
|
|
par->com_seq = device_property_read_bool(dev, "solomon,com-seq");
|
|
par->com_lrremap = device_property_read_bool(dev, "solomon,com-lrremap");
|
|
par->com_invdir = device_property_read_bool(dev, "solomon,com-invdir");
|
|
par->area_color_enable =
|
|
device_property_read_bool(dev, "solomon,area-color-enable");
|
|
par->low_power = device_property_read_bool(dev, "solomon,low-power");
|
|
|
|
par->contrast = 127;
|
|
par->vcomh = par->device_info->default_vcomh;
|
|
|
|
/* Setup display timing */
|
|
if (device_property_read_u32(dev, "solomon,dclk-div", &par->dclk_div))
|
|
par->dclk_div = par->device_info->default_dclk_div;
|
|
if (device_property_read_u32(dev, "solomon,dclk-frq", &par->dclk_frq))
|
|
par->dclk_frq = par->device_info->default_dclk_frq;
|
|
|
|
vmem_size = DIV_ROUND_UP(par->width, 8) * par->height;
|
|
|
|
vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
|
get_order(vmem_size));
|
|
if (!vmem) {
|
|
dev_err(dev, "Couldn't allocate graphical memory.\n");
|
|
ret = -ENOMEM;
|
|
goto fb_alloc_error;
|
|
}
|
|
|
|
ssd1307fb_defio = devm_kzalloc(dev, sizeof(*ssd1307fb_defio),
|
|
GFP_KERNEL);
|
|
if (!ssd1307fb_defio) {
|
|
dev_err(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 = DIV_ROUND_UP(par->width, 8);
|
|
info->fbdefio = ssd1307fb_defio;
|
|
|
|
info->var = ssd1307fb_var;
|
|
info->var.xres = par->width;
|
|
info->var.xres_virtual = par->width;
|
|
info->var.yres = par->height;
|
|
info->var.yres_virtual = par->height;
|
|
|
|
info->screen_buffer = vmem;
|
|
info->fix.smem_start = __pa(vmem);
|
|
info->fix.smem_len = vmem_size;
|
|
|
|
fb_deferred_io_init(info);
|
|
|
|
i2c_set_clientdata(client, info);
|
|
|
|
if (par->reset) {
|
|
/* Reset the screen */
|
|
gpiod_set_value_cansleep(par->reset, 1);
|
|
udelay(4);
|
|
gpiod_set_value_cansleep(par->reset, 0);
|
|
udelay(4);
|
|
}
|
|
|
|
if (par->vbat_reg) {
|
|
ret = regulator_enable(par->vbat_reg);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable VBAT: %d\n", ret);
|
|
goto reset_oled_error;
|
|
}
|
|
}
|
|
|
|
ret = ssd1307fb_init(par);
|
|
if (ret)
|
|
goto regulator_enable_error;
|
|
|
|
ret = register_framebuffer(info);
|
|
if (ret) {
|
|
dev_err(dev, "Couldn't register the framebuffer\n");
|
|
goto panel_init_error;
|
|
}
|
|
|
|
snprintf(bl_name, sizeof(bl_name), "ssd1307fb%d", info->node);
|
|
bl = backlight_device_register(bl_name, dev, par, &ssd1307fb_bl_ops,
|
|
NULL);
|
|
if (IS_ERR(bl)) {
|
|
ret = PTR_ERR(bl);
|
|
dev_err(dev, "unable to register backlight device: %d\n", ret);
|
|
goto bl_init_error;
|
|
}
|
|
|
|
bl->props.brightness = par->contrast;
|
|
bl->props.max_brightness = MAX_CONTRAST;
|
|
info->bl_dev = bl;
|
|
|
|
dev_info(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->device_info->need_pwm) {
|
|
pwm_disable(par->pwm);
|
|
pwm_put(par->pwm);
|
|
}
|
|
regulator_enable_error:
|
|
if (par->vbat_reg)
|
|
regulator_disable(par->vbat_reg);
|
|
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;
|
|
|
|
ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF);
|
|
|
|
backlight_device_unregister(info->bl_dev);
|
|
|
|
unregister_framebuffer(info);
|
|
if (par->device_info->need_pwm) {
|
|
pwm_disable(par->pwm);
|
|
pwm_put(par->pwm);
|
|
}
|
|
if (par->vbat_reg)
|
|
regulator_disable(par->vbat_reg);
|
|
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 },
|
|
{ "ssd1309fb", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ssd1307fb_i2c_id);
|
|
|
|
static struct i2c_driver ssd1307fb_driver = {
|
|
.probe_new = ssd1307fb_probe,
|
|
.remove = ssd1307fb_remove,
|
|
.id_table = ssd1307fb_i2c_id,
|
|
.driver = {
|
|
.name = "ssd1307fb",
|
|
.of_match_table = ssd1307fb_of_match,
|
|
},
|
|
};
|
|
|
|
module_i2c_driver(ssd1307fb_driver);
|
|
|
|
MODULE_DESCRIPTION("FB driver for the Solomon SSD1307 OLED controller");
|
|
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
|
|
MODULE_LICENSE("GPL");
|