300 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* drivers/video/backlight/ili9320.c3 *4 * ILI9320 LCD controller driver core.5 *6 * Copyright 2007 Simtec Electronics7 * http://armlinux.simtec.co.uk/8 * Ben Dooks <ben@simtec.co.uk>9*/10 11#include <linux/delay.h>12#include <linux/err.h>13#include <linux/fb.h>14#include <linux/init.h>15#include <linux/lcd.h>16#include <linux/module.h>17#include <linux/slab.h>18 19#include <linux/spi/spi.h>20 21#include <video/ili9320.h>22 23#include "ili9320.h"24 25 26static inline int ili9320_write_spi(struct ili9320 *ili,27 unsigned int reg,28 unsigned int value)29{30 struct ili9320_spi *spi = &ili->access.spi;31 unsigned char *addr = spi->buffer_addr;32 unsigned char *data = spi->buffer_data;33 34 /* spi message consits of:35 * first byte: ID and operation36 */37 38 addr[0] = spi->id | ILI9320_SPI_INDEX | ILI9320_SPI_WRITE;39 addr[1] = reg >> 8;40 addr[2] = reg;41 42 /* second message is the data to transfer */43 44 data[0] = spi->id | ILI9320_SPI_DATA | ILI9320_SPI_WRITE;45 data[1] = value >> 8;46 data[2] = value;47 48 return spi_sync(spi->dev, &spi->message);49}50 51int ili9320_write(struct ili9320 *ili, unsigned int reg, unsigned int value)52{53 dev_dbg(ili->dev, "write: reg=%02x, val=%04x\n", reg, value);54 return ili->write(ili, reg, value);55}56EXPORT_SYMBOL_GPL(ili9320_write);57 58int ili9320_write_regs(struct ili9320 *ili,59 const struct ili9320_reg *values,60 int nr_values)61{62 int index;63 int ret;64 65 for (index = 0; index < nr_values; index++, values++) {66 ret = ili9320_write(ili, values->address, values->value);67 if (ret != 0)68 return ret;69 }70 71 return 0;72}73EXPORT_SYMBOL_GPL(ili9320_write_regs);74 75static void ili9320_reset(struct ili9320 *lcd)76{77 struct ili9320_platdata *cfg = lcd->platdata;78 79 cfg->reset(1);80 mdelay(50);81 82 cfg->reset(0);83 mdelay(50);84 85 cfg->reset(1);86 mdelay(100);87}88 89static inline int ili9320_init_chip(struct ili9320 *lcd)90{91 int ret;92 93 ili9320_reset(lcd);94 95 ret = lcd->client->init(lcd, lcd->platdata);96 if (ret != 0) {97 dev_err(lcd->dev, "failed to initialise display\n");98 return ret;99 }100 101 lcd->initialised = 1;102 return 0;103}104 105static inline int ili9320_power_on(struct ili9320 *lcd)106{107 if (!lcd->initialised)108 ili9320_init_chip(lcd);109 110 lcd->display1 |= (ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);111 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);112 113 return 0;114}115 116static inline int ili9320_power_off(struct ili9320 *lcd)117{118 lcd->display1 &= ~(ILI9320_DISPLAY1_D(3) | ILI9320_DISPLAY1_BASEE);119 ili9320_write(lcd, ILI9320_DISPLAY1, lcd->display1);120 121 return 0;122}123 124#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)125 126static int ili9320_power(struct ili9320 *lcd, int power)127{128 int ret = 0;129 130 dev_dbg(lcd->dev, "power %d => %d\n", lcd->power, power);131 132 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))133 ret = ili9320_power_on(lcd);134 else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))135 ret = ili9320_power_off(lcd);136 137 if (ret == 0)138 lcd->power = power;139 else140 dev_warn(lcd->dev, "failed to set power mode %d\n", power);141 142 return ret;143}144 145static inline struct ili9320 *to_our_lcd(struct lcd_device *lcd)146{147 return lcd_get_data(lcd);148}149 150static int ili9320_set_power(struct lcd_device *ld, int power)151{152 struct ili9320 *lcd = to_our_lcd(ld);153 154 return ili9320_power(lcd, power);155}156 157static int ili9320_get_power(struct lcd_device *ld)158{159 struct ili9320 *lcd = to_our_lcd(ld);160 161 return lcd->power;162}163 164static const struct lcd_ops ili9320_ops = {165 .get_power = ili9320_get_power,166 .set_power = ili9320_set_power,167};168 169static void ili9320_setup_spi(struct ili9320 *ili,170 struct spi_device *dev)171{172 struct ili9320_spi *spi = &ili->access.spi;173 174 ili->write = ili9320_write_spi;175 spi->dev = dev;176 177 /* fill the two messages we are going to use to send the data178 * with, the first the address followed by the data. The datasheet179 * says they should be done as two distinct cycles of the SPI CS line.180 */181 182 spi->xfer[0].tx_buf = spi->buffer_addr;183 spi->xfer[1].tx_buf = spi->buffer_data;184 spi->xfer[0].len = 3;185 spi->xfer[1].len = 3;186 spi->xfer[0].bits_per_word = 8;187 spi->xfer[1].bits_per_word = 8;188 spi->xfer[0].cs_change = 1;189 190 spi_message_init(&spi->message);191 spi_message_add_tail(&spi->xfer[0], &spi->message);192 spi_message_add_tail(&spi->xfer[1], &spi->message);193}194 195int ili9320_probe_spi(struct spi_device *spi,196 struct ili9320_client *client)197{198 struct ili9320_platdata *cfg = dev_get_platdata(&spi->dev);199 struct device *dev = &spi->dev;200 struct ili9320 *ili;201 struct lcd_device *lcd;202 int ret = 0;203 204 /* verify we where given some information */205 206 if (cfg == NULL) {207 dev_err(dev, "no platform data supplied\n");208 return -EINVAL;209 }210 211 if (cfg->hsize <= 0 || cfg->vsize <= 0 || cfg->reset == NULL) {212 dev_err(dev, "invalid platform data supplied\n");213 return -EINVAL;214 }215 216 /* allocate and initialse our state */217 218 ili = devm_kzalloc(&spi->dev, sizeof(struct ili9320), GFP_KERNEL);219 if (ili == NULL)220 return -ENOMEM;221 222 ili->access.spi.id = ILI9320_SPI_IDCODE | ILI9320_SPI_ID(1);223 224 ili->dev = dev;225 ili->client = client;226 ili->power = FB_BLANK_POWERDOWN;227 ili->platdata = cfg;228 229 spi_set_drvdata(spi, ili);230 231 ili9320_setup_spi(ili, spi);232 233 lcd = devm_lcd_device_register(&spi->dev, "ili9320", dev, ili,234 &ili9320_ops);235 if (IS_ERR(lcd)) {236 dev_err(dev, "failed to register lcd device\n");237 return PTR_ERR(lcd);238 }239 240 ili->lcd = lcd;241 242 dev_info(dev, "initialising %s\n", client->name);243 244 ret = ili9320_power(ili, FB_BLANK_UNBLANK);245 if (ret != 0) {246 dev_err(dev, "failed to set lcd power state\n");247 return ret;248 }249 250 return 0;251}252EXPORT_SYMBOL_GPL(ili9320_probe_spi);253 254void ili9320_remove(struct ili9320 *ili)255{256 ili9320_power(ili, FB_BLANK_POWERDOWN);257}258EXPORT_SYMBOL_GPL(ili9320_remove);259 260#ifdef CONFIG_PM_SLEEP261int ili9320_suspend(struct ili9320 *lcd)262{263 int ret;264 265 ret = ili9320_power(lcd, FB_BLANK_POWERDOWN);266 267 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP) {268 ili9320_write(lcd, ILI9320_POWER1, lcd->power1 |269 ILI9320_POWER1_SLP |270 ILI9320_POWER1_DSTB);271 lcd->initialised = 0;272 }273 274 return ret;275}276EXPORT_SYMBOL_GPL(ili9320_suspend);277 278int ili9320_resume(struct ili9320 *lcd)279{280 dev_info(lcd->dev, "resuming from power state %d\n", lcd->power);281 282 if (lcd->platdata->suspend == ILI9320_SUSPEND_DEEP)283 ili9320_write(lcd, ILI9320_POWER1, 0x00);284 285 return ili9320_power(lcd, FB_BLANK_UNBLANK);286}287EXPORT_SYMBOL_GPL(ili9320_resume);288#endif289 290/* Power down all displays on reboot, poweroff or halt */291void ili9320_shutdown(struct ili9320 *lcd)292{293 ili9320_power(lcd, FB_BLANK_POWERDOWN);294}295EXPORT_SYMBOL_GPL(ili9320_shutdown);296 297MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");298MODULE_DESCRIPTION("ILI9320 LCD Driver");299MODULE_LICENSE("GPL v2");300