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810 lines
20 KiB
810 lines
20 KiB
// 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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|
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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 col_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 %lluns 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, par->col_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->col_offset + 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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|
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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) |
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{ |
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struct ssd1307fb_par *par = bl_get_data(bdev); |
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int ret; |
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int brightness = bdev->props.brightness; |
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par->contrast = brightness; |
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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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return 0; |
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} |
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static int ssd1307fb_get_brightness(struct backlight_device *bdev) |
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{ |
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struct ssd1307fb_par *par = bl_get_data(bdev); |
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return par->contrast; |
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} |
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static int ssd1307fb_check_fb(struct backlight_device *bdev, |
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struct fb_info *info) |
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{ |
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return (info->bl_dev == bdev); |
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} |
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static const struct backlight_ops ssd1307fb_bl_ops = { |
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.options = BL_CORE_SUSPENDRESUME, |
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.update_status = ssd1307fb_update_bl, |
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.get_brightness = ssd1307fb_get_brightness, |
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.check_fb = ssd1307fb_check_fb, |
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}; |
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static struct ssd1307fb_deviceinfo ssd1307fb_ssd1305_deviceinfo = { |
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.default_vcomh = 0x34, |
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.default_dclk_div = 1, |
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.default_dclk_frq = 7, |
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}; |
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static struct ssd1307fb_deviceinfo ssd1307fb_ssd1306_deviceinfo = { |
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.default_vcomh = 0x20, |
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.default_dclk_div = 1, |
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.default_dclk_frq = 8, |
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.need_chargepump = 1, |
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}; |
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static struct ssd1307fb_deviceinfo ssd1307fb_ssd1307_deviceinfo = { |
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.default_vcomh = 0x20, |
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.default_dclk_div = 2, |
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.default_dclk_frq = 12, |
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.need_pwm = 1, |
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}; |
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static struct ssd1307fb_deviceinfo ssd1307fb_ssd1309_deviceinfo = { |
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.default_vcomh = 0x34, |
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.default_dclk_div = 1, |
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.default_dclk_frq = 10, |
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}; |
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static const struct of_device_id ssd1307fb_of_match[] = { |
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{ |
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.compatible = "solomon,ssd1305fb-i2c", |
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.data = (void *)&ssd1307fb_ssd1305_deviceinfo, |
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}, |
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{ |
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.compatible = "solomon,ssd1306fb-i2c", |
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.data = (void *)&ssd1307fb_ssd1306_deviceinfo, |
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}, |
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{ |
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.compatible = "solomon,ssd1307fb-i2c", |
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.data = (void *)&ssd1307fb_ssd1307_deviceinfo, |
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}, |
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{ |
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.compatible = "solomon,ssd1309fb-i2c", |
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.data = (void *)&ssd1307fb_ssd1309_deviceinfo, |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, ssd1307fb_of_match); |
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|
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static int ssd1307fb_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct backlight_device *bl; |
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char bl_name[12]; |
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struct fb_info *info; |
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struct fb_deferred_io *ssd1307fb_defio; |
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u32 vmem_size; |
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struct ssd1307fb_par *par; |
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void *vmem; |
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int ret; |
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|
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info = framebuffer_alloc(sizeof(struct ssd1307fb_par), dev); |
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if (!info) |
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return -ENOMEM; |
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|
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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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|
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par->device_info = device_get_match_data(dev); |
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|
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par->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); |
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if (IS_ERR(par->reset)) { |
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dev_err(dev, "failed to get reset gpio: %ld\n", |
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PTR_ERR(par->reset)); |
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ret = PTR_ERR(par->reset); |
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goto fb_alloc_error; |
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} |
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|
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par->vbat_reg = devm_regulator_get_optional(dev, "vbat"); |
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if (IS_ERR(par->vbat_reg)) { |
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ret = PTR_ERR(par->vbat_reg); |
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if (ret == -ENODEV) { |
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par->vbat_reg = NULL; |
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} else { |
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dev_err(dev, "failed to get VBAT regulator: %d\n", ret); |
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goto fb_alloc_error; |
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} |
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} |
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|
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if (device_property_read_u32(dev, "solomon,width", &par->width)) |
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par->width = 96; |
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|
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if (device_property_read_u32(dev, "solomon,height", &par->height)) |
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par->height = 16; |
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|
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if (device_property_read_u32(dev, "solomon,page-offset", &par->page_offset)) |
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par->page_offset = 1; |
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|
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if (device_property_read_u32(dev, "solomon,col-offset", &par->col_offset)) |
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par->col_offset = 0; |
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|
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if (device_property_read_u32(dev, "solomon,com-offset", &par->com_offset)) |
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par->com_offset = 0; |
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|
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if (device_property_read_u32(dev, "solomon,prechargep1", &par->prechargep1)) |
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par->prechargep1 = 2; |
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|
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if (device_property_read_u32(dev, "solomon,prechargep2", &par->prechargep2)) |
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par->prechargep2 = 2; |
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|
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if (!device_property_read_u8_array(dev, "solomon,lookup-table", |
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par->lookup_table, |
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ARRAY_SIZE(par->lookup_table))) |
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par->lookup_table_set = 1; |
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|
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par->seg_remap = !device_property_read_bool(dev, "solomon,segment-no-remap"); |
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par->com_seq = device_property_read_bool(dev, "solomon,com-seq"); |
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par->com_lrremap = device_property_read_bool(dev, "solomon,com-lrremap"); |
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par->com_invdir = device_property_read_bool(dev, "solomon,com-invdir"); |
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par->area_color_enable = |
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device_property_read_bool(dev, "solomon,area-color-enable"); |
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par->low_power = device_property_read_bool(dev, "solomon,low-power"); |
|
|
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par->contrast = 127; |
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par->vcomh = par->device_info->default_vcomh; |
|
|
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/* Setup display timing */ |
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if (device_property_read_u32(dev, "solomon,dclk-div", &par->dclk_div)) |
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par->dclk_div = par->device_info->default_dclk_div; |
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if (device_property_read_u32(dev, "solomon,dclk-frq", &par->dclk_frq)) |
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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 <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|