2  * l4f00242t03.c -- support for Epson L4F00242T03 LCD
4  * Copyright 2007-2009 Freescale Semiconductor, Inc. All Rights Reserved.
18 #include <linux/gpio.h>
23 #include <linux/spi/spi.h>
24 #include <linux/spi/l4f00242t03.h>
27 	struct spi_device	*spi;  member
35 static void l4f00242t03_reset(unsigned int gpio)  in l4f00242t03_reset()  argument
38 	gpio_set_value(gpio, 1);  in l4f00242t03_reset()
40 	gpio_set_value(gpio, 0);  in l4f00242t03_reset()
42 	gpio_set_value(gpio, 1);  in l4f00242t03_reset()
48 static void l4f00242t03_lcd_init(struct spi_device *spi)  in l4f00242t03_lcd_init()  argument
50 	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;  in l4f00242t03_lcd_init()
51 	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);  in l4f00242t03_lcd_init()
54 	dev_dbg(&spi->dev, "initializing LCD\n");  in l4f00242t03_lcd_init()
56 	regulator_set_voltage(priv->io_reg, 1800000, 1800000);  in l4f00242t03_lcd_init()
57 	regulator_enable(priv->io_reg);  in l4f00242t03_lcd_init()
59 	regulator_set_voltage(priv->core_reg, 2800000, 2800000);  in l4f00242t03_lcd_init()
60 	regulator_enable(priv->core_reg);  in l4f00242t03_lcd_init()
62 	l4f00242t03_reset(pdata->reset_gpio);  in l4f00242t03_lcd_init()
64 	gpio_set_value(pdata->data_enable_gpio, 1);  in l4f00242t03_lcd_init()
66 	spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));  in l4f00242t03_lcd_init()
69 static void l4f00242t03_lcd_powerdown(struct spi_device *spi)  in l4f00242t03_lcd_powerdown()  argument
71 	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;  in l4f00242t03_lcd_powerdown()
72 	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);  in l4f00242t03_lcd_powerdown()
74 	dev_dbg(&spi->dev, "Powering down LCD\n");  in l4f00242t03_lcd_powerdown()
76 	gpio_set_value(pdata->data_enable_gpio, 0);  in l4f00242t03_lcd_powerdown()
78 	regulator_disable(priv->io_reg);  in l4f00242t03_lcd_powerdown()
79 	regulator_disable(priv->core_reg);  in l4f00242t03_lcd_powerdown()
86 	return priv->lcd_state;  in l4f00242t03_lcd_power_get()
92 	struct spi_device *spi = priv->spi;  in l4f00242t03_lcd_power_set()  local
101 		if (priv->lcd_state <= FB_BLANK_NORMAL) {  in l4f00242t03_lcd_power_set()
103 		} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {  in l4f00242t03_lcd_power_set()
104 			dev_dbg(&spi->dev, "Resuming LCD\n");  in l4f00242t03_lcd_power_set()
106 			spi_write(spi, (const u8 *)&slpout, sizeof(u16));  in l4f00242t03_lcd_power_set()
108 			spi_write(spi, (const u8 *)&dison, sizeof(u16));  in l4f00242t03_lcd_power_set()
110 			/* priv->lcd_state == FB_BLANK_POWERDOWN */  in l4f00242t03_lcd_power_set()
111 			l4f00242t03_lcd_init(spi);  in l4f00242t03_lcd_power_set()
112 			priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;  in l4f00242t03_lcd_power_set()
113 			l4f00242t03_lcd_power_set(priv->ld, power);  in l4f00242t03_lcd_power_set()
116 		if (priv->lcd_state <= FB_BLANK_NORMAL) {  in l4f00242t03_lcd_power_set()
118 			dev_dbg(&spi->dev, "Standby the LCD\n");  in l4f00242t03_lcd_power_set()
120 			spi_write(spi, (const u8 *)&disoff, sizeof(u16));  in l4f00242t03_lcd_power_set()
122 			spi_write(spi, (const u8 *)&slpin, sizeof(u16));  in l4f00242t03_lcd_power_set()
123 		} else if (priv->lcd_state < FB_BLANK_POWERDOWN) {  in l4f00242t03_lcd_power_set()
126 			/* priv->lcd_state == FB_BLANK_POWERDOWN */  in l4f00242t03_lcd_power_set()
127 			l4f00242t03_lcd_init(spi);  in l4f00242t03_lcd_power_set()
128 			priv->lcd_state = FB_BLANK_UNBLANK;  in l4f00242t03_lcd_power_set()
133 		if (priv->lcd_state != FB_BLANK_POWERDOWN) {  in l4f00242t03_lcd_power_set()
135 			spi_write(spi, (const u8 *)&disoff, sizeof(u16));  in l4f00242t03_lcd_power_set()
137 			l4f00242t03_lcd_powerdown(spi);  in l4f00242t03_lcd_power_set()
141 	priv->lcd_state = power;  in l4f00242t03_lcd_power_set()
151 static int __devinit l4f00242t03_probe(struct spi_device *spi)  in l4f00242t03_probe()  argument
154 	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;  in l4f00242t03_probe()
158 		dev_err(&spi->dev, "Uninitialized platform data.\n");  in l4f00242t03_probe()
159 		return -EINVAL;  in l4f00242t03_probe()
165 		dev_err(&spi->dev, "No memory for this device.\n");  in l4f00242t03_probe()
166 		return -ENOMEM;  in l4f00242t03_probe()
169 	dev_set_drvdata(&spi->dev, priv);  in l4f00242t03_probe()
170 	spi->bits_per_word = 9;  in l4f00242t03_probe()
171 	spi_setup(spi);  in l4f00242t03_probe()
173 	priv->spi = spi;  in l4f00242t03_probe()
175 	ret = gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH,  in l4f00242t03_probe()
178 		dev_err(&spi->dev,  in l4f00242t03_probe()
179 			"Unable to get the lcd l4f00242t03 reset gpio.\n");  in l4f00242t03_probe()
183 	ret = gpio_request_one(pdata->data_enable_gpio, GPIOF_OUT_INIT_LOW,  in l4f00242t03_probe()
186 		dev_err(&spi->dev,  in l4f00242t03_probe()
187 			"Unable to get the lcd l4f00242t03 data en gpio.\n");  in l4f00242t03_probe()
191 	priv->io_reg = regulator_get(&spi->dev, "vdd");  in l4f00242t03_probe()
192 	if (IS_ERR(priv->io_reg)) {  in l4f00242t03_probe()
193 		ret = PTR_ERR(priv->io_reg);  in l4f00242t03_probe()
194 		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",  in l4f00242t03_probe()
199 	priv->core_reg = regulator_get(&spi->dev, "vcore");  in l4f00242t03_probe()
200 	if (IS_ERR(priv->core_reg)) {  in l4f00242t03_probe()
201 		ret = PTR_ERR(priv->core_reg);  in l4f00242t03_probe()
202 		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",  in l4f00242t03_probe()
207 	priv->ld = lcd_device_register("l4f00242t03",  in l4f00242t03_probe()
208 					&spi->dev, priv, &l4f_ops);  in l4f00242t03_probe()
209 	if (IS_ERR(priv->ld)) {  in l4f00242t03_probe()
210 		ret = PTR_ERR(priv->ld);  in l4f00242t03_probe()
215 	l4f00242t03_lcd_init(spi);  in l4f00242t03_probe()
216 	priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;  in l4f00242t03_probe()
217 	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);  in l4f00242t03_probe()
219 	dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");  in l4f00242t03_probe()
224 	regulator_put(priv->core_reg);  in l4f00242t03_probe()
226 	regulator_put(priv->io_reg);  in l4f00242t03_probe()
228 	gpio_free(pdata->data_enable_gpio);  in l4f00242t03_probe()
230 	gpio_free(pdata->reset_gpio);  in l4f00242t03_probe()
237 static int __devexit l4f00242t03_remove(struct spi_device *spi)  in l4f00242t03_remove()  argument
239 	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);  in l4f00242t03_remove()
240 	struct l4f00242t03_pdata *pdata = priv->spi->dev.platform_data;  in l4f00242t03_remove()
242 	l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);  in l4f00242t03_remove()
243 	lcd_device_unregister(priv->ld);  in l4f00242t03_remove()
245 	dev_set_drvdata(&spi->dev, NULL);  in l4f00242t03_remove()
247 	gpio_free(pdata->data_enable_gpio);  in l4f00242t03_remove()
248 	gpio_free(pdata->reset_gpio);  in l4f00242t03_remove()
250 	regulator_put(priv->io_reg);  in l4f00242t03_remove()
251 	regulator_put(priv->core_reg);  in l4f00242t03_remove()
258 static void l4f00242t03_shutdown(struct spi_device *spi)  in l4f00242t03_shutdown()  argument
260 	struct l4f00242t03_priv *priv = dev_get_drvdata(&spi->dev);  in l4f00242t03_shutdown()
263 		l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);  in l4f00242t03_shutdown()