1 /*
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>
18 #include <linux/slab.h>
19 #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
37 struct tosa_lcd_data {
38 struct spi_device *spi;
39 struct lcd_device *lcd;
40 struct i2c_client *i2c;
41
42 int lcd_power;
43 bool is_vga;
44 };
45
tosa_tg_send(struct spi_device * spi,int adrs,uint8_t data)46 static 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 = 0,
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
tosa_bl_enable(struct spi_device * spi,int enable)63 int tosa_bl_enable(struct spi_device *spi, int enable)
64 {
65 /* bl_enable GP04=1 otherwise GP04=0*/
66 return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00);
67 }
68 EXPORT_SYMBOL(tosa_bl_enable);
69
tosa_lcd_tg_init(struct tosa_lcd_data * data)70 static 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
tosa_lcd_tg_on(struct tosa_lcd_data * data)83 static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
84 {
85 struct spi_device *spi = data->spi;
86 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);
92
93 /* TG LCD pannel power up */
94 tosa_tg_send(spi, TG_PINICTL, 0x4);
95 mdelay(50);
96
97 /* TG LCD GVSS */
98 tosa_tg_send(spi, TG_PINICTL, 0x0);
99
100 if (!data->i2c) {
101 /*
102 * after the pannel is powered up the first time,
103 * we can access the i2c bus so probe for the DAC
104 */
105 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
tosa_lcd_tg_off(struct tosa_lcd_data * data)115 static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
116 {
117 struct spi_device *spi = data->spi;
118
119 /* TG LCD VHSA off */
120 tosa_tg_send(spi, TG_PINICTL, 0x4);
121 mdelay(50);
122
123 /* TG LCD signal off */
124 tosa_tg_send(spi, TG_PINICTL, 0x6);
125 mdelay(50);
126
127 /* TG Off */
128 gpio_set_value(TOSA_GPIO_TG_ON, 1);
129 mdelay(100);
130 }
131
tosa_lcd_set_power(struct lcd_device * lcd,int power)132 int 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
tosa_lcd_get_power(struct lcd_device * lcd)146 static 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
tosa_lcd_set_mode(struct lcd_device * lcd,struct fb_videomode * mode)153 static 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
168 static struct lcd_ops tosa_lcd_ops = {
169 .set_power = tosa_lcd_set_power,
170 .get_power = tosa_lcd_get_power,
171 .set_mode = tosa_lcd_set_mode,
172 };
173
tosa_lcd_probe(struct spi_device * spi)174 static int tosa_lcd_probe(struct spi_device *spi)
175 {
176 int ret;
177 struct tosa_lcd_data *data;
178
179 data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
180 GFP_KERNEL);
181 if (!data)
182 return -ENOMEM;
183
184 data->is_vga = true; /* default to VGA mode */
185
186 /*
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)
193 return ret;
194
195 data->spi = spi;
196 spi_set_drvdata(spi, data);
197
198 ret = devm_gpio_request_one(&spi->dev, TOSA_GPIO_TG_ON,
199 GPIOF_OUT_INIT_LOW, "tg #pwr");
200 if (ret < 0)
201 return ret;
202
203 mdelay(60);
204
205 tosa_lcd_tg_init(data);
206
207 tosa_lcd_tg_on(data);
208
209 data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
210 data, &tosa_lcd_ops);
211
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
220 err_register:
221 tosa_lcd_tg_off(data);
222 return ret;
223 }
224
tosa_lcd_remove(struct spi_device * spi)225 static int tosa_lcd_remove(struct spi_device *spi)
226 {
227 struct tosa_lcd_data *data = spi_get_drvdata(spi);
228
229 if (data->i2c)
230 i2c_unregister_device(data->i2c);
231
232 tosa_lcd_tg_off(data);
233
234 return 0;
235 }
236
237 #ifdef CONFIG_PM_SLEEP
tosa_lcd_suspend(struct device * dev)238 static int tosa_lcd_suspend(struct device *dev)
239 {
240 struct tosa_lcd_data *data = dev_get_drvdata(dev);
241
242 tosa_lcd_tg_off(data);
243
244 return 0;
245 }
246
tosa_lcd_resume(struct device * dev)247 static int tosa_lcd_resume(struct device *dev)
248 {
249 struct tosa_lcd_data *data = dev_get_drvdata(dev);
250
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 }
259 #endif
260
261 static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
262
263 static struct spi_driver tosa_lcd_driver = {
264 .driver = {
265 .name = "tosa-lcd",
266 .pm = &tosa_lcd_pm_ops,
267 },
268 .probe = tosa_lcd_probe,
269 .remove = tosa_lcd_remove,
270 };
271
272 module_spi_driver(tosa_lcd_driver);
273
274 MODULE_AUTHOR("Dmitry Baryshkov");
275 MODULE_LICENSE("GPL v2");
276 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
277 MODULE_ALIAS("spi:tosa-lcd");
278
