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Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +04001/*
2 * LCD / Backlight control code for Sharp SL-6000x (tosa)
3 *
4 * Copyright (c) 2005 Dirk Opfer
5 * Copyright (c) 2007,2008 Dmitry Baryshkov
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/device.h>
16#include <linux/spi/spi.h>
17#include <linux/i2c.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +040019#include <linux/gpio.h>
20#include <linux/delay.h>
21#include <linux/lcd.h>
22#include <linux/fb.h>
23
24#include <asm/mach/sharpsl_param.h>
25
26#include <mach/tosa.h>
27
28#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
29
30#define TG_REG0_VQV 0x0001
31#define TG_REG0_COLOR 0x0002
32#define TG_REG0_UD 0x0004
33#define TG_REG0_LR 0x0008
34
35#define DAC_BASE 0x4e
36
37struct tosa_lcd_data {
38 struct spi_device *spi;
39 struct lcd_device *lcd;
40 struct i2c_client *i2c;
41
42 int lcd_power;
Dmitry Baryshkov0ec561f2008-12-04 16:54:42 +000043 bool is_vga;
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +040044};
45
46static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
47{
48 u8 buf[1];
49 struct spi_message msg;
50 struct spi_transfer xfer = {
51 .len = 1,
52 .cs_change = 1,
53 .tx_buf = buf,
54 };
55
56 buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
57 spi_message_init(&msg);
58 spi_message_add_tail(&xfer, &msg);
59
60 return spi_sync(spi, &msg);
61}
62
63int tosa_bl_enable(struct spi_device *spi, int enable)
64{
65 /* bl_enable GP04=1 otherwise GP04=0*/
Jingoo Han8ab77f42012-12-17 16:00:36 -080066 return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +040067}
68EXPORT_SYMBOL(tosa_bl_enable);
69
70static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
71{
72 /* TG on */
73 gpio_set_value(TOSA_GPIO_TG_ON, 0);
74
75 mdelay(60);
76
77 /* delayed 0clk TCTL signal for VGA */
78 tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
79 /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
80 tosa_tg_send(data->spi, TG_GPOSR, 0x02);
81}
82
83static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
84{
85 struct spi_device *spi = data->spi;
Dmitry Baryshkov0ec561f2008-12-04 16:54:42 +000086 int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
87
88 if (data->is_vga)
89 value |= TG_REG0_VQV;
90
91 tosa_tg_send(spi, TG_PNLCTL, value);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +040092
93 /* TG LCD pannel power up */
Jingoo Han8ab77f42012-12-17 16:00:36 -080094 tosa_tg_send(spi, TG_PINICTL, 0x4);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +040095 mdelay(50);
96
97 /* TG LCD GVSS */
Jingoo Han8ab77f42012-12-17 16:00:36 -080098 tosa_tg_send(spi, TG_PINICTL, 0x0);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +040099
100 if (!data->i2c) {
Jingoo Han8ab77f42012-12-17 16:00:36 -0800101 /*
102 * after the pannel is powered up the first time,
103 * we can access the i2c bus so probe for the DAC
104 */
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400105 struct i2c_adapter *adap = i2c_get_adapter(0);
106 struct i2c_board_info info = {
107 .type = "tosa-bl",
108 .addr = DAC_BASE,
109 .platform_data = data->spi,
110 };
111 data->i2c = i2c_new_device(adap, &info);
112 }
113}
114
115static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
116{
117 struct spi_device *spi = data->spi;
118
119 /* TG LCD VHSA off */
Jingoo Han8ab77f42012-12-17 16:00:36 -0800120 tosa_tg_send(spi, TG_PINICTL, 0x4);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400121 mdelay(50);
122
123 /* TG LCD signal off */
Jingoo Han8ab77f42012-12-17 16:00:36 -0800124 tosa_tg_send(spi, TG_PINICTL, 0x6);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400125 mdelay(50);
126
127 /* TG Off */
128 gpio_set_value(TOSA_GPIO_TG_ON, 1);
129 mdelay(100);
130}
131
132int tosa_lcd_set_power(struct lcd_device *lcd, int power)
133{
134 struct tosa_lcd_data *data = lcd_get_data(lcd);
135
136 if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
137 tosa_lcd_tg_on(data);
138
139 if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
140 tosa_lcd_tg_off(data);
141
142 data->lcd_power = power;
143 return 0;
144}
145
146static int tosa_lcd_get_power(struct lcd_device *lcd)
147{
148 struct tosa_lcd_data *data = lcd_get_data(lcd);
149
150 return data->lcd_power;
151}
152
Dmitry Baryshkov0ec561f2008-12-04 16:54:42 +0000153static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
154{
155 struct tosa_lcd_data *data = lcd_get_data(lcd);
156
157 if (mode->xres == 320 || mode->yres == 320)
158 data->is_vga = false;
159 else
160 data->is_vga = true;
161
162 if (POWER_IS_ON(data->lcd_power))
163 tosa_lcd_tg_on(data);
164
165 return 0;
166}
167
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400168static struct lcd_ops tosa_lcd_ops = {
169 .set_power = tosa_lcd_set_power,
170 .get_power = tosa_lcd_get_power,
Dmitry Baryshkov0ec561f2008-12-04 16:54:42 +0000171 .set_mode = tosa_lcd_set_mode,
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400172};
173
Bill Pemberton1b9e4502012-11-19 13:21:46 -0500174static int tosa_lcd_probe(struct spi_device *spi)
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400175{
176 int ret;
177 struct tosa_lcd_data *data;
178
Jingoo Hanc8515292012-05-29 15:07:25 -0700179 data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
180 GFP_KERNEL);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400181 if (!data)
182 return -ENOMEM;
183
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200184 data->is_vga = true; /* default to VGA mode */
Dmitry Baryshkov0ec561f2008-12-04 16:54:42 +0000185
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400186 /*
187 * bits_per_word cannot be configured in platform data
188 */
189 spi->bits_per_word = 8;
190
191 ret = spi_setup(spi);
192 if (ret < 0)
Jingoo Hanc8515292012-05-29 15:07:25 -0700193 return ret;
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400194
195 data->spi = spi;
Jingoo Hanc324f512013-02-21 16:43:41 -0800196 spi_set_drvdata(spi, data);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400197
Jingoo Han05a5d4d2012-12-17 16:00:41 -0800198 ret = devm_gpio_request_one(&spi->dev, TOSA_GPIO_TG_ON,
199 GPIOF_OUT_INIT_LOW, "tg #pwr");
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400200 if (ret < 0)
Sachin Kamatd24c8152013-09-20 12:08:53 +0530201 return ret;
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400202
203 mdelay(60);
204
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400205 tosa_lcd_tg_init(data);
206
207 tosa_lcd_tg_on(data);
208
Jingoo Han0f534492014-01-23 15:54:30 -0800209 data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
210 data, &tosa_lcd_ops);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400211
212 if (IS_ERR(data->lcd)) {
213 ret = PTR_ERR(data->lcd);
214 data->lcd = NULL;
215 goto err_register;
216 }
217
218 return 0;
219
220err_register:
221 tosa_lcd_tg_off(data);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400222 return ret;
223}
224
Bill Pemberton7e4b9d02012-11-19 13:26:34 -0500225static int tosa_lcd_remove(struct spi_device *spi)
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400226{
Jingoo Hanc324f512013-02-21 16:43:41 -0800227 struct tosa_lcd_data *data = spi_get_drvdata(spi);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400228
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400229 if (data->i2c)
230 i2c_unregister_device(data->i2c);
231
232 tosa_lcd_tg_off(data);
233
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400234 return 0;
235}
236
Jingoo Han1dde37d2013-04-29 16:18:00 -0700237#ifdef CONFIG_PM_SLEEP
238static int tosa_lcd_suspend(struct device *dev)
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400239{
Jingoo Han1dde37d2013-04-29 16:18:00 -0700240 struct tosa_lcd_data *data = dev_get_drvdata(dev);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400241
242 tosa_lcd_tg_off(data);
243
244 return 0;
245}
246
Jingoo Han1dde37d2013-04-29 16:18:00 -0700247static int tosa_lcd_resume(struct device *dev)
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400248{
Jingoo Han1dde37d2013-04-29 16:18:00 -0700249 struct tosa_lcd_data *data = dev_get_drvdata(dev);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400250
251 tosa_lcd_tg_init(data);
252 if (POWER_IS_ON(data->lcd_power))
253 tosa_lcd_tg_on(data);
254 else
255 tosa_lcd_tg_off(data);
256
257 return 0;
258}
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400259#endif
260
Jingoo Han1dde37d2013-04-29 16:18:00 -0700261static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
262
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400263static struct spi_driver tosa_lcd_driver = {
264 .driver = {
265 .name = "tosa-lcd",
266 .owner = THIS_MODULE,
Jingoo Han1dde37d2013-04-29 16:18:00 -0700267 .pm = &tosa_lcd_pm_ops,
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400268 },
269 .probe = tosa_lcd_probe,
Bill Pembertond1723fa2012-11-19 13:21:09 -0500270 .remove = tosa_lcd_remove,
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400271};
272
Axel Lin462dd832012-03-23 15:01:59 -0700273module_spi_driver(tosa_lcd_driver);
Dmitry Baryshkovfbd1b172008-09-13 20:58:51 +0400274
275MODULE_AUTHOR("Dmitry Baryshkov");
276MODULE_LICENSE("GPL v2");
277MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
Anton Vorontsove0626e32009-09-22 16:46:08 -0700278MODULE_ALIAS("spi:tosa-lcd");